• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    "WELL BACKGROUND PRESSURE COMPENSATION DEVICE". The present invention relates to a downhole pressure compensation device for use in combination with a downhole tool, comprising a housing with a chamber and an internal hollow section, a first piston dividing the chamber into a first section to a second section, the first section being in fluid communication with a first fluid port, the second section is in fluid communication with a well bore through a second fluid port, and a first spring arranged inside of the second section to exert pressure on the first piston to allow the preservation of an overpressure in the first section. In addition, the device comprises a second piston, a second spring disposed between the first piston and the second piston, and an overpressure channel disposed in the first or second piston, the overpressure channel, when the second spring is in a compressed condition, provides fluid communication between said first and second sections. The present invention also concerns a downhole system which (...).
    公开号:BR112013021921B1
    申请号:R112013021921-1
    申请日:2012-03-29
    公开日:2020-07-21
    发明作者:Jørgen Hallundbæk
    申请人:Welltec A/S；
    IPC主号:
    专利说明:

    [0001] [001] The present invention relates to a pressure compensation device used for pressure equalization in downhole tools to prevent implosions or explosions of the tools. Background of the Technique
    [0002] [002] Downhole tools such as drive units, hitters, drills, etc. they are exposed to extreme pressure differences between the inside and outside of the tools. In order to prevent implosion or explosion collapse of the tools, which can damage both the tools and the well structure, and, furthermore, cause interruptions to well production, pressure compensation devices have been well known for decades in this field. To accommodate pressure compensation, a borehole fluid is typically allowed inside the tool on one side of the pressure compensation device and hydraulic fluids typically kept inside a downhole tool can be on the other side, equalizing that two pressures on each side of the pressure compensation device.
    [0003] [003] A variety of pressure compensation devices are known to use rubber bags, diaphragms, bellows and springs in the pressure compensation mechanism. However, they suffer from being designed to withstand a certain pressure difference, which, when exceeded, leads to the collapse of the mechanism.
    [0004] [004] Increased reliability and a safer fail-safe mechanism for a pressure compensation device for downhole use, which would therefore lead to optimized drilling and production performance, thereby minimizing costs and maximizing return well. Since several types of tools require pressure compensation during borehole operations, several different processes would benefit from an improved pressure compensation device, all leading to a minimized risk of limiting production time.
    [0005] [005] Thus, there is a need for it to be possible to compensate pressures in well bore tools during the exploration, production and monitoring of subsurface deposits, such as oil and gas deposits. Summary of the invention
    [0006] [006] It is an objective of the present invention to totally or partially overcome the above disadvantages and disadvantages of the prior art. More specifically, it is an object to provide an improved pressure compensation system for well tools during the exploration, production and monitoring of subsurface deposits, such as oil and gas deposits.
    [0007] [007] The above objects, together with numerous other objects, advantages, and characteristics which will become evident from the description below are consummated by a solution according to the present invention by a downhole pressure compensation device for use in combination with a downhole tool, comprising:
    [0008] [008] a housing with a chamber and a hollow inner section
    [0009] [009] a first piston dividing the chamber into a first section and a second section, the first section being in fluid communication with a first fluid hold, the second section is in fluid communication with a well bore through a second fluid port, and
    [0010] [0010] a first spring arranged within the second section to exert pressure on the first piston and to allow the preservation of an overpressure in the first section,
    [0011] [0011] in which the device additionally comprises:
    [0012] [0012] a second piston,
    [0013] [0013] a second spring arranged between the first piston and the second piston, and
    [0014] [0014] an overpressure channel disposed in the first or the second piston, and the overpressure channel, when the second spring is in a compressed condition, provides fluid communication between said first and second sections.
    [0015] [0015] In one embodiment, the downhole pressure compensation device may comprise at least one pressure connection with a joint tool on a tool column.
    [0016] [0016] Since said joining tool can be a drive unit.
    [0017] [0017] In another embodiment, the second section of the compensation device may be in fluid communication with the interior of an electric motor unit and / or a hydraulic pump unit.
    [0018] [0018] In addition, the first spring, and the second spring, the first piston and the second piston can be arranged coaxially with the longitudinal central geometric axis of the compensation device.
    [0019] [0019] In addition, at least one of the first spring and second spring, the first piston and the second piston may have been arranged non-coaxially with the longitudinal central geometric axis of the compensation device not circumscribing the internal hollow section.
    [0020] [0020] The compensation device according to the invention can be arranged non-coaxially with the longitudinal central geometric axis of the tool.
    [0021] [0021] Additionally, the second piston can be partially disposed within the first piston.
    [0022] [0022] In addition, the first piston can be partially disposed within the second piston.
    [0023] [0023] In one embodiment, the first section of the chamber can be filled with a pressurized hydraulic fluid, such as oil with predetermined characteristics (compatible with well hole conditions).
    [0024] [0024] In addition, the first and second springs can be spiral springs, helical springs, bellows, volute springs, leaf springs, gas pressure springs and disc springs.
    [0025] [0025] The downhole pressure compensation device according to the invention may also comprise electrical sensors for monitoring a temperature inside the device, and / or pressures in the first and second sections and / or positions of the first and second pistons to produce a feedback signal to the control system.
    [0026] [0026] Said downhole pressure compensation device can also comprise at least one switch, and the compensation device can be controlled by at least one switch connected to the control system to adapt to changes in environmental conditions based on the feedback signal.
    [0027] [0027] In addition, the device may comprise a plurality of first and / or second springs.
    [0028] [0028] In addition, the device may comprise a plurality of spring guides.
    [0029] [0029] Additionally, the second spring can be arranged inside the first piston.
    [0030] [0030] The device can comprise a plurality of first springs arranged concentrically in the housing.
    [0031] [0031] In one embodiment, the second spring can be arranged inside the first piston in an overpressure valve, the overpressure valve comprising the second spring and the second piston.
    [0032] [0032] Additionally, the housing can comprise a tubular member and two end members connected in a detachable manner.
    [0033] - um cabo de aço, - uma ferramenta de junção como uma unidade de acionamento e/ou uma ferramenta operacional, e - um dispositivo de compensação de pressão de fundo de poço de acordo com a invenção. [0033] The present invention additionally relates to a downhole system comprising: - a steel cable, - a joining tool such as a drive unit and / or an operational tool, and - a downhole pressure compensation device according to the invention.
    [0034] - pelo menos uma ferramenta de junção como uma unidade de acionamento e/ou uma ferramenta operacional, e - um dispositivo de compensação de pressão de fundo de poço de acordo com a invenção. [0034] The present invention also relates to a downhole tool system comprising: - at least one joining tool such as a drive unit and / or an operational tool, and - a downhole pressure compensation device according to the invention.
    [0035] [0035] The invention and its many advantages will be described in more detail below, with reference to the attached schematic drawings, which, for the purpose of illustration, show some not limited modalities and in which
    [0036] [0036] Fig. 1 shows a cross-sectional view of a pressure compensation device,
    [0037] [0037] Figs. 2a and 2d show schematic diagrams of a pressure compensation device when filling a first section with hydraulic fluid,
    [0038] [0038] Figs. 3a and 3d show schematic diagrams of a pressure compensation device when filling a second section with well bore fluid,
    [0039] [0039] Figs. 4a to 4d show schematic diagrams of various modes of pressure compensation devices,
    [0040] [0040] Fig. 5 shows a compensation device comprising springs arranged non-coaxially,
    [0041] [0041] Fig. 6 shows a compensation device arranged non-coaxially with a central geometric axis of the tool,
    [0042] [0042] Fig. 7 shows a downhole system comprising a pressure compensation device,
    [0043] [0043] Fig. 8 shows a well bore tool column comprising a pressure compensation device,
    [0044] [0044] Fig. 9 shows a cross-sectional view of a pressure compensation device,
    [0045] [0045] Fig. 10 shows a schematic diagram of a pressure compensation device when filling a first section with hydraulic fluid,
    [0046] [0046] Fig. 11 shows a schematic diagram of a pressure compensation device when filling a second section with well bore fluid, and
    [0047] [0047] Fig. 12 shows a cross-sectional view of a pressure compensation device.
    [0048] [0048] All figures are highly schematic and not necessarily to scale, and they show only those parts which are necessary in order to elucidate the invention, with other parts being omitted or merely suggested. Detailed description of the Invention
    [0049] [0049] Fig. 1 shows a pressure compensation device 20 to compensate for pressure differences between the inside and outside of a downhole tool to prevent implosion or explosion of such tool due to pressure differences. The pressure compensation device 20 is attached to a downhole tool 115 in order to compensate for changes in pressure. The pressure compensation device 20 comprises a housing 100 with a chamber 101 and an internal hollow section 102. The hollow section 102 can facilitate electrical connections 112 between two tools 115 arranged at each end of the compensation device 20 and connected to the compensation device 20 by connection means 116. The pressure in the hollow section 102 is regulated by a first piston 103, a second piston 109, a first spring 108 and a second spring 110. An interior of the two tools connected to each end of the compensation device can be in fluid communication with the interior 113 of the hollow section 102 whereby the internal pressure of the two tools can be regulated by the compensation device 20. The first piston 103 and the second piston 109 seal the first section 104 from the second section 105 of the chamber 101. When the first spring 108 is disposed between a second end face 101b of the chamber and a second face 103b of the first piston 103, the the first spring 108 thus applies a force to the second end face 101b of the chamber 101 and a second face 103b of the first piston 103. The second spring 110 is disposed between the first piston 103 and the second piston 109, the second spring being 110 applies a force to the first piston 103 and the second piston 109. An overpressure channel 111 is arranged on the first and / or second piston to provide a fluid connection between the first and second sections 104, 105 of the chamber 101, when the first and second pistons 103, 109 are moved towards their extreme positions at each end of chamber 101. Fig. 1 shows a compressed state of the first spring 108, and if the first and second pistons 103, 109 are moved further towards the second end face of the chamber 101, the second piston 109 will, when the first spring is compressed to a certain degree, engage the second end face, thereby interrupting the movement of the second piston so 109 towards the second end face of the chamber 101. When the first piston 103 continues to move towards the second end face, the second spring 110 will begin to be compressed, and at a given point the overpressure fluid channel it will then provide access between the first and second sections 104, 105 of chamber 101, and the fluid from the first section 104 of chamber 101 will begin to flow through the overpressure fluid channel entering the second section 105 of chamber 101.
    [0050] [0050] In Fig. 2 and 3, the activation of the overpressure channel at both ends of the chamber 101 is shown step by step.
    [0051] [0051] Figs. 2a to 2d show the displacement of the first and second pistons towards the second end face 101b due to pressurization of the first section 104 of the chamber 101. Before lowering the compensation device 20 to a well hole 4, the first section 104 it can be filled with fluid by removing a plug 124 from a first fluid port 106 and filling the first section 104 with fluid, whereby the first section 104 will be pressurized. Fig. 2a shows the first and second springs 108, 110 in relaxed positions with the first and second pistons 103, 109 arranged towards the first end face 101a and the overpressure channel 111 closed. When a pressurizing fluid enters the first section 104 through the first fluid port 106, the first spring 108 is compressed as shown in Fig. 2b. As can be seen in Fig. 2b, the second spring 110 is still uncompressed in this condition and, therefore, the overpressure channel is still closed, resulting in a fluidless connection between the first and second sections 104, 105. If, at However, the first section 104 is additionally pressurized, the second spring 110 will begin to be compressed resulting in the movement of the second piston 109, while the first piston 103 has stopped moving, which can be seen in Fig. 2c. As indicated by an arrow in Fig. 2c, the overpressure channel provides fluid communication between the first and second sections 104, 105 when the second piston 109 is disposed beyond a certain point, thereby allowing the fluid in the first section 104 flows to the second section 105, thereby relieving the overpressure of the first section 104. In Fig. 2d, the first fluid port 106 is closed, thereby interrupting the influx of pressurized fluid into the first section 104. When the first port fluid 106 is closed, the second piston 109 moves back towards its relaxed position as the fluid exits the first section 104 through the overpressure channel 111. When the second piston 109 reaches a position in relation to the first piston 103 , the overpressure fluid channel is closed again as shown in Fig. 2d, and then the second piston 109 will stop moving. This mechanism then provides a pressure restriction on the first section 104, so it does not exceed a certain maximum pressure. In addition, this allows the user to pressurize the first section 104 to a predetermined pressure each time the first section 104 is pressurized before lowering the compensation device 20 to the well bore. The current spring constants of the first and second springs 108, 110 are chosen to correspond to the predetermined pressure. Thus, the predetermined pressure can be controlled by changing the springs or preloading the springs to a certain degree in order to accommodate specific pressure requirements for the compensation device 20 compatible with specific downhole conditions.
    [0052] [0052] Figs, from 3a to 3d show how the pressure is compensated during an accumulation of pressure in the well bore. As explained above, the first section 104 is pressurized before lowering the compensation device 20 to the well bore. Therefore, the initial condition of the compensation device 20 when lowered to the well bore is the situation shown in Fig. 2d. Then, when the compensation device enters the well bore, the pressure from the well bore is transferred to the second section 105 through the second fluid port 107, and the pressure in the second section 105 increases as the pressure in the bore hole. well increases. In Fig. 3a, the pressure of the well hole forced the first and second pistons 103, 109 towards the first end face of chamber 101 by decompressing the first spring 108. By this movement of the first piston 103, the pressure is compensated, that is, the pressure is uniformized in the first and second sections of the pressure compensation device 20. As the first section 104 is in fluid communication with the inside of a tool, the tool will thus have a compensated pressure, and therefore , will not be destroyed during a pressure buildup in the well bore. The problem is that if the pressure inside the tool becomes much higher or much less than outside the tool, the tool will increase or decrease in volume. To avoid this change in volume of the tool, the inside of the tool is connected to a pressure compensation device, so that if the pressure in the well hole, that is, in the second section 105 becomes much higher than in the tool, which is in fluid communication with the first section 104, the first section 104 may decrease in volume. If, on the other hand, the pressure in the well hole is much less than in the tool, the first section 104 may increase in volume. Fig. 3b shows the situation where the first piston reached its maximum displacement towards the first end face and is in contiguity with the first end face due to the increase in pressure in the second section 105 resulting from the increase pressure in the well bore. If the pressure continues to increase in the second section 105 beyond the point shown in Fig. 3b, the second piston 109 will begin to move towards the first end face and the second spring 110 will begin to compress. As shown in Fig. 3c, the overpressure in the second section 105 opens the fluid connection between the first and the second sections 104,105 when the second piston 109 has moved far enough towards the first end face, which allows the fluid from the second section 105 enter the first section 104. In general, this is an undesirable situation since the dirty fluid from the well hole is allowed to enter the compensation device 20 and, thus, the inside of the tool is in fluid communication with the first section 104 of the compensation device 20. However, the alternative can be much worse since the tools can be completely destroyed by implosion if they are not able to compensate for the well hole pressure. In addition, the deformation caused by such an implosion can cause the pressure compensation device and / or the tool attached to it to stick inside the well hole, leading to a complete interruption of well production. Therefore, flooding the first section 104 of the compensation device 20 and then the tool with the dirty fluid from the well bore protects both the pressure compensation device and the pressure compensation tool from collapse. Therefore, the possibility of leaving the well hole fluid inside the first section 104 acts as a fail-safe for the pressure compensation device 20. In case the fail-over guarantee is activated and the hydraulic fluid of the first section 104 be polluted with dirty fluid from the borehole, both the pressure compensation device 20 and the potentially polluted tool will normally be removed from the borehole and thoroughly cleaned.
    [0053] [0053] In Fig. 3d, the second piston 109 recedes towards the second end face, thus closing the overpressure channel after the pressure has been uniformized in the first and second sections 104,105.
    [0054] [0054] The compensation device 20 serves another purpose in relation to pressure compensation. When the compensation device 20 is lowered into the well hole, the temperature increases depending on the depth and the proximity of the well hole to the layers of magma. When a volume of pressurized fluid in the first section 104 increases due to the increase in temperature, the pressure on the first and second pistons 103, 109 increases. In that case the pressure exceeds a pressure defined by the first and second springs. 108, 110 to open the overpressure channel, the hydraulic fluid of the first section 104 being released in the second section 105 and in the well bore. Again, the compensation device 20 acts as a fail-safe against the collapse or expansion of the compensation device and / or the tool attached to the compensation device due to the thermal expansion of the hydraulic fluid in the pressure compensation device 20. Conventionally, this This problem has been addressed only by partially pre-filling the compensation devices to prevent expansion. This previous approach has the following two disadvantages. The first disadvantage is that, although the compensation device is only partially filled to prevent expansion due to thermal expansion, it still depends on the fact that the temperature is below the critical temperature. This is due to the fact that temperatures can fluctuate locally, for example, close to the magma layers, for extremely high temperatures. Thus, the safety of the compensation device can be compromised even with the conservative fillings of the hydraulic fluid in the compensation device, so that the tool expands anyway if the compensation device cannot withstand the pressure of the thermally expanded hydraulic fluid. The second disadvantage is that the hydraulic fluid serves the purpose of withstanding the pressure drift from the well bore pressure which also increases with depth and local conditions in the well bore. Only by pre-filling and partially compensating devices, that is, decreasing the amount of hydraulic fluid in a compensator, the ability to compensate pressure in a tool is reduced since less hydraulic fluid will be available in the first section. Capacity is reduced as the volume of the hydraulic fluid can decrease during pressure compensation through leaks in fluid communication with the first section of the chamber, for example, through leaks in the tool, which typically occurs during operation in the well.
    [0055] [0055] Figs. 4a to 4d show different embodiments according to the invention. Fig. 4a shows a compensation device 20 according to the invention, the overpressure channel 111 being a hole inside the first piston 103. For installation of the overpressure channel internally in the first piston 103, an opening of the overpressure channel can be be disposed away from the second spring 110. Fig. 4b shows a compensation device 20, in which the overpressure channel can be partially arranged in the second piston 109 and partially in the first piston 103, and when the second spring 110 is properly compressed, the overpressure channels are aligned and fluid is allowed to flow from one section 104,105 of chamber 101 to the other. Fig. 4c shows a compensation device 20, in which the first piston was partially arranged within the second piston 109 and the overpressure channel was arranged in the housing 100 of the compensation device 20. Fig. 4d shows a compensation device 20 , where the first piston 103 has been partially disposed within the second piston 109 and the overpressure channel has been partially disposed in the second piston 109 and partially in the second piston 103, and when the second spring 110 is properly compressed, the overpressure channels are aligned and the fluid is allowed to flow from one section 104, 105 of chamber 101 to the other.
    [0056] [0056] Fig. 5 shows a compensation device in which two second springs 110 were arranged non-coaxially with the central geometric axis of the tool for two second pistons 103 away from the second end face 101b of the chamber 101.
    [0057] [0057] Fig. 6 shows a compensation device 20 in which the compensation device is arranged non-coaxially as the central geometric axis of the tool of the tool. In this way, the compensation device 20 can be arranged in parallel with another device, tool or, as shown in Fig. 6, an empty space 121. The freedom to arrange the compensation device non-coaxially with respect to the central geometric axis increases the versatility of the compensation device in the optimization of the space design in the downhole tool column. In Fig. 6, the void 121 may provide the possibility of facilitating a hydraulic pressure fluid to pass through a compensation device without entering either the compensation chamber 101 or the interior 113 of the hollow section 102. In addition, Fig. 6 shows an embodiment of a compensation device comprising a plurality of first and / or second springs. Other embodiments may comprise a large number of separate springs. The compensating device shown in Fig. 6 comprises a one-way valve 122 arranged in the first fluid port 106 and a set of switches 123 to allow a feedback signal to a control system, which allows the user to check when pistons and springs reach extreme positions during compression or decompression of the springs.
    [0058] [0058] When the compensation device is installed, it constitutes part of a downhole tool column 10 as shown in Figs. 7 and 8. In Figs. 7 and 8, the tool column may comprise drive unit 11, compensation devices 20 and operating tools 12, etc. The tool column 10 comprises tool 115, such as a drive unit 11 arranged in a housing 6, having an interior 4, in a well or well hole 5 in formation 2. The well hole tool column 10 is energized through a steel cable 9 which is connected to the tool via an upper connector 13. The downhole tool comprises an electronic section that has mode change electronic components 15 and control electronic components 16 before electricity be provided for an electric motor 17 that drives a hydraulic pump 18. The drive unit 11 can be connected to an operational tool 12 via a connector 14.
    [0059] [0059] As shown in Figs. 9 and 10, the second spring 110 can be arranged inside the first piston 103 in an overpressure valve 120, the overpressure valve comprising the second spring 110 and the second piston 109. Since a typical overpressure valve 120 is opened for one-way flow only, a recess 119 in section 102 can facilitate the release of overpressure in the first section 104 as will be explained below. An overpressure channel 111 is arranged on the first piston to provide a fluid connection between the first and second sections 104, 105 of the chamber 101 when the second pistons 109 are displaced towards the maximum compression of the second spring 110.
    [0060] [0060] Fig. 9 shows the first spring 108 in an uncompressed state, such as before filling the compensation device. The first piston 103 is forced towards the end of the chamber 101 before filling the first section 104 with pressurized fluid as explained in Fig. 2b.
    [0061] [0061] Fig. 10 shows the compensation device of Fig. 9 during the filling of the first section 104 with pressurized fluid. When the first piston 103 reaches the recess 119 position, the pressurized fluid is allowed to flow from the first section 104 to the second section 105, thereby releasing the overpressure from the first section 104. When the pressure is released to the second section 105, the pressurized fluid will come out of the second fluid port 107 and the user will know that the pressure in the first section 104 has reached a desired level.
    [0062] [0062] In Fig. 11, the compensation device 20 of Fig. 9 and 10 is shown during pressure buildup in the second section 105 when fluid from the well bore enters the second section 105 through the second fluid port 107 and the pressure in the second section 105 increases as the well hole pressure increases. In Fig. 11, the pressure of the well hole forced the first pistons 103 towards the first end face 101a, decompressing the first spring 108. With this movement of the first piston 103, the pressure is compensated, that is, the pressure is uniform in the first and second sections of the pressure compensation device 20. Since the first section 104 is in fluid communication with the interior of a tool, the tool will thus have the pressure compensated and therefore will not be destroyed during an accumulation pressure in the well bore. Fig. 11 shows the situation where the first piston has reached its maximum displacement towards the first end face 101a and is in contiguity with the first end face 101a due to the increase in pressure in the second section 105 deriving from the pressure increase in the well bore. If the pressure continues to increase in the second section 105, the second piston 109 will begin to move towards the first end face and the second spring 110 will begin to compress. As shown, the overpressure in the second section 105 opens the fluid connection through the overpressure channel 111 between the first and second sections 104, 105 when the second piston 109 has moved sufficiently towards the first end face 101a, which allows allow the fluid from the second section 105 to enter the first section 104.
    [0063] [0063] Fig. 12 shows another compensation device 20 compressing two rows of first springs 108 arranged concentrically in the compensation device 20. The first row of first springs 108a is disposed within the second row of first springs 108b. Each row of springs contains four separate springs, separated only by numerous spring guides 129. The number of spring guides 129 has been installed along the first two springs 108 to prevent unwanted spring bending during compression, which can lead to entanglement of the two rows arranged concentrically of the first springs 108.
    [0064] [0064] In some embodiments of the invention, the spring may be of another type of spring in addition to the conventional spiral spring shown in the figures. These types can be helical spring type, bellows type, volute spring type, leaf spring type, gas spring type or disc spring type.
    [0065] [0065] The first and second fluid ports can be controllably sealed by a valve such as one: ball valve, butterfly valve, throttle valve, check valve or non-return valve, diaphragm valve, expansion valve, gate valve, globular valve, guillotine valve, needle valve, piston valve, pinch valve or plug valve.
    [0066] [0066] Although the invention has been described above in connection with the preferred embodiments of the invention, it will be apparent to a person skilled in the art that various modifications are conceivable without departing from the invention as defined in the following claims.
    权利要求:
    Claims (15)
    [0001]
    Downhole pressure compensation device (20) for use in combination with a downhole tool, comprising: a housing (100) with a chamber (101) and a hollow inner section (102), a first piston (103) dividing the chamber (101) into a first section (104) and a second section (105), the first section being in fluid communication with a first fluid port (106), the second section (105) is in fluid communication with a well hole (4) through a second fluid port (107), and a first spring (108) disposed within the second section (105) to exert pressure on the first piston (103) to allow the preservation of an overpressure in the first section (104), characterized by the fact that the device additionally comprises: a second piston (109), a second spring (110) disposed between the first piston (103) and the second piston (109), and an overpressure channel (111) disposed in the first or second piston (109), the overpressure channel, when the second spring is in a compressed condition, providing fluid communication between said first and second sections.
    [0002]
    Downhole pressure compensation device (20) according to claim 1, characterized in that it comprises at least one pressure connection to a joint tool (11, 17, 18, 20) in a column of tool (10).
    [0003]
    Downhole pressure compensation device (20), according to claim 2, characterized by the fact that the joint tool (11, 17, 18, 20) is a drive unit (11).
    [0004]
    Downhole pressure compensation device (20) according to any one of claims 1 to 3, characterized in that the second section of the compensation device is in fluid communication with the interior of an electric motor unit ( 17) and / or a hydraulic pump unit (18).
    [0005]
    Downhole pressure compensation device (20) according to any one of claims 1 to 4, characterized in that the first spring (108), the second spring, the first piston (103) and the second piston (109) are arranged coaxially with the longitudinal central geometric axis of the compensation device.
    [0006]
    Downhole pressure compensation device (20) according to any one of claims 1 to 4, characterized in that at least one of the first spring (108), the second spring, the first piston (103) and the second piston (109) was arranged not coaxially with the longitudinal central geometric axis of the compensation device not circumscribing the internal hollow section.
    [0007]
    Downhole pressure compensation device (20) according to claim 6, characterized in that the compensation device is arranged non-coaxially with a longitudinal central geometric axis of the tool.
    [0008]
    Downhole pressure compensation device (20) according to any one of claims 1 to 7, characterized in that the second piston (109) is partially disposed within the first piston.
    [0009]
    Downhole pressure compensation device (20) according to any one of claims 1 to 8, characterized in that the first piston (103) is partly disposed within the second piston (109).
    [0010]
    Downhole pressure compensation device (20) according to any one of claims 1 to 9, characterized in that the first section (104) of the chamber (101) is filled with a pressurized hydraulic fluid such as oil with predetermined characteristics that match the well hole conditions (4).
    [0011]
    Downhole pressure compensation device (20) according to any one of claims 1 to 10, characterized in that it additionally comprises electrical sensors for monitoring a temperature inside the device and / or the pressure in the first and second sections and / or positions of the first and second pistons to produce a feedback signal to a control system.
    [0012]
    Downhole pressure compensation device (20) according to any one of claims 1 to 11, characterized in that it additionally comprises at least one switch in which the compensation device can be controlled by at least one switch connected to the control system to adapt to changes in environmental conditions based on the feedback signal.
    [0013]
    Downhole pressure compensation device (20) according to any one of claims 1 to 12, characterized in that the device comprises a plurality of the first and / or second springs.
    [0014]
    Downhole system, characterized by the fact that it comprises: a steel cable (9), a joining tool (11, 17, 18, 20) as a drive unit (11) and / or an operational tool, and a downhole pressure compensation device as defined in any one of claims 1 to 13.
    [0015]
    Downhole tool system, characterized by the fact that it comprises: at least one joining tool (11, 17, 18, 20) as a drive unit (11) and / or an operational tool, and a downhole pressure compensation device as defined in any one of claims 1 to 13.
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    同族专利:
    公开号 | 公开日
    RU2013147497A|2015-05-10|
    CN103492672B|2016-08-10|
    EP2505773B1|2013-05-08|
    US20140014352A1|2014-01-16|
    DK2505773T3|2013-06-10|
    BR112013021921A2|2016-11-08|
    EP2505773A1|2012-10-03|
    WO2012130936A1|2012-10-04|
    MY166423A|2018-06-25|
    RU2591235C2|2016-07-20|
    CA2831718C|2019-04-23|
    CA2831718A1|2012-10-04|
    CN103492672A|2014-01-01|
    US9458695B2|2016-10-04|
    MX2013011123A|2013-10-17|
    AU2012234254B2|2015-02-19|
    AU2012234254A1|2013-05-02|
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-10-15| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-05-19| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-07-21| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 29/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP11160490.6A|EP2505773B1|2011-03-30|2011-03-30|Downhole pressure compensating device|
    EP11160490.6|2011-03-30|
    PCT/EP2012/055632|WO2012130936A1|2011-03-30|2012-03-29|Downhole pressure compensating device|
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