• 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:
    centrifugal collector of underground debris. the present invention relates to an underground debris trap that picks up debris-laden fluid at the lower end. the inlet flow is induced with an ejector whose discharge passes around the housing for the entrance of the lower end to the debris. suction from the ejector induces flow into the lower end of the housing as well. Inlet debris rises an annular space around the collection receptacle and rotates to pass through a paddle wheel that provides a rotation for the current flow. the flow direction is reversed from above before the wheel descends through a tube after the wheel. the solids are thrown to the periphery of the tube and the fluid reverses the direction to return upwards to a screen before reaching the suction connection of the ejector. the debris pivots downward to an open bottom tube and is collected in a housing around the bottom tube.
    公开号:BR112013027281B1
    申请号:R112013027281-3
    申请日:2012-03-09
    公开日:2021-04-27
    发明作者:Hong Zhu
    申请人:Baker Hughes Incorporated；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [0001] The present invention relates to underground debris cleaning tools and, more particularly, to the type of tools that direct the debris with flow into the lower end of the tool and retain the debris in a collection volume around an inlet tube and, more particularly, also employ a swirling movement of the inlet charged debris flow to intensify separation in the tool. BACKGROUND OF THE INVENTION
    [0002] Milling operations in underground locations involve the circulation of fluid that is intended to remove chips to the surface. Some of these chips are not carried to the surface and are deposited on a well hole support, such as a plug or bridge plug below. In open pit situations, the well may fall, sending debris into the uncoated hole. Over time, sand and other debris can settle out on an uncoated well hole support and need to be removed to access the support, or to allow for other underground operations.
    [0003] Well-hole cleaning tools have been used to remove such debris. Different styles have developed over time. In a traditional model, the driving fluid passes through the center of the tool and the lower part, to fluidize the debris and sends the debris-loaded flow around the outside of the tool, in which a disperser redirects the flow through the tool body. A receptacle collects debris as the clean fluid passes through a sieve and is discharged over the bypass to travel to the surface.
    [0004] Another type of tool has an air current going to the bottom of the well outside the tool to drive debris to the bottom end of the tool, where the debris is collected and clean fluid that passes through a sieve is returned to the surface outside the tool through ports located near the jet outlets oriented to the bottom of the well. The jet outlets act as an eductor to pull the laden debris flow to the bottom end of the tool. Some examples of such tools are USP: 6,176,311, 6,607,031, 7,779,901, 7,610,957, 7,472,745, 6,276,452, 5,123,489. Debris pickers with a circulation pattern that takes debris to the outside of the tool body and sends it to the tool with a disperser as illustrated in USP: 4,924,940, 6,189,617, 6,250,387 and 7,478,687 .
    [0005] The use of centrifugal force to separate components of different densities is illustrated in a product sold by Cavins of Houston, Texas, under the name Sandtrap Downhole Desander for use with submersible electric pump suction lines. USP 7,635,430 illustrates the use of a hydrocyclone in a wellhead. Also relevant to the underground debris removal field is SPE 96440; P. Connel and D. B. Houghton, Debris Removal from Deep Water Well Bore Using Vectorized Annular Cleaning System Reduces Problems and Saves Probing Time. Also relevant to the field of underground debris removal are USP 4276931 and 6978841.
    [0006] Current models of debris removal devices that collect debris with reverse fluid circulation into the lower end of the tool frame have used a direct shot to the inlet tube coupled with a baffle at the top which can be a cone shape 10, as in Fig. 1 or a flat plate 12, as in Fig. 2. The arrow 14 represents the direction that the solids need to go to be collected in the chamber 16 which is arranged around the inlet tube 18. One of the concerns of the drawings in figs. 1 and 2 is that a very long separation chamber that is between the cone 10 or the plate 12 and the outlet 20, is necessary to separate the debris from the fluid that flows by gravity and the deceleration of the fluid speed that occurs when the flow of debris-laden fluid leaves the inlet tube 18 and proceeds to the larger diameter of the housing 22 on the way to the outlet 20. After the outlet 20 there is a screen or screen and the debris that does not fall into the chamber 16 ends up placing a load on that screen above, which prevents movement and the ability to pick up debris in the first place. Increasing the inlet speed in an effort to drag more debris into the tube 18 also ends up being counterproductive in the drawings of FIG. 1 and 2 since the higher speed after the exit of the tube 18 also causes greater turbulence and dragging of the debris that would otherwise have been allowed to settle by gravity to the collection chamber 16. FIG. 3 illustrates the well-known Baker Hughes V ACS, a part of which is shown in FIGS. 1 and 2. It also shows that the flow from output 22 goes to a screen 23 and is then forced (“educted”) into a feed stream 25, from the surface. After the outlet of the eductor 27 the flow divides 29 going to the surface, 31 going to the bottom and into the inlet tube 18.
    [0007] The present invention aims to improve the separation effect and to do so in a smaller space and in a way that can advantageously use higher speeds to increase the separation. This is achieved mainly by inducing a whirlwind into the flow of fluid laden with incoming debris. A turbine wheel transmits the spiral pattern to the fluid flow, so that the solids by centrifugal force are thrown to the outer periphery of a flow pipe downward before reversing and transforming into the path to the outlet of the housing and the screen downstream. These and other aspects of the present invention will be more readily apparent to those skilled in the art from a review of the description of the preferred embodiment and the associated drawings, and understanding that the full scope of the invention must be determined from the appended claims. SUMMARY OF THE INVENTION
    [0008] An underground debris collector collects debris-laden fluid at the lower end. The inlet flow is induced with an eductor whose discharge passes around the housing to the lower inlet end for the debris. The suction of the eductor induces the flow into the lower end of the housing as well. Inlet debris rises an annular space around the collection receptacle and rotates to pass through a paddle wheel, which provides a rotation for the current flow. The flow direction is reversed from top to bottom before the wheel through a tube after the wheel. The solids are thrown to the periphery of the tube and the fluid reverses the direction to return to a screen before reaching the suction connection of the eductor. The debris pivots down from an open bottom tube and is collected in a box around the bottom tube. BRIEF DESCRIPTION OF THE DRAWINGS
    [0009] FIG. 1 is a prior art design of a debris removal tool collecting debris at a bottom location through an inlet tube with a cone-shaped cap at the top; FIG. 2 is another variant of the prior art of FIG. 1 where the plate is located above the upper outlet of the inlet tube, FIG. 3 is a cross-sectional view of a prior art removal tool known as VACS; FIG. 4 is a cross-sectional view of the debris removal tool of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
    [00010] FIG. 4 is a schematic representation of part of the debris collection apparatus 50 of the present invention. As in the previous drawings, the fluid is delivered from the surface under pressure in line 52 and into the entrance of the eductor 54. At the exit of the eductor 56 the flow goes to the bottom of the hole in 58 and returns to the surface in 60. The flow 58 picks up milling residues or other local operations for final retention in a collection housing 64, which is inside an outer box 66. Inlet debris flow 62 is a continuation of flows 58, which now have debris carried away with him. After separation, the outflow of fluid passes through the screen S before reaching the inlet of the eductor 54. In the past, fine debris that did not separate previously ended up clogging the screen S and reducing circulation rates. This had a detrimental effect on the ability to direct debris to the apparatus 50 at the location of the inlet flow 62.
    [00011] The manner in which the separation takes place in the housing 66 and the configuration of the internal components of the housing 66 represent the departure of the previous drawings. Inlet stream 62 introduces debris and is channeled to an annular flow path 68 as represented by arrow 70. Flowing through annular path 68 through inlet maintains fluid velocity to keep entrained solids on the way to the first inversion of the direction represented by the arrow 72. The open volume 74 above the upper end 76 of the box 64 allows a larger radius turn that reduces the flow resistance and effects of erosion of solids making a change of direction. As an alternative, the upper end 76 could extend the top cover 78 and, instead, have a door aligned with the inlets 80 of a stationary turbine wheel 82. The wheel 82 is mounted on the outlet tube 84 and has a seal 86 between them. As an alternative to the fixed assembly that induces rotation due to its shape, the wheel assembly 82 can rotate on a sealed bearing as schematically represented by a circular arrow 88. In this case, the shield 90 for the wheel assembly 82 is fixed to the housing collection 64. The flow at the inlets 80 rotates the wheel 82 on a vertical axis. The flow current leaves the wheel 82 with a transmitted rotation and heads and proceeds to the annular passage 92 formed between the outlet tube 84 and the lower tube 94. The curved arrow 96 illustrates how the solids 98 are moved by the centripetal force to the against the wall of the lower tube 94. The flowing stream finds its outlet at the lower end of the outlet tube 84 and reverses the direction again goes up the tube 84, as illustrated by arrow 100. Debris 98, due to the its weight and the rotation action continue to move to the bottom to form a collection pile 102. Arrow 104 represents the clean flow with a desirably small amount of fines that will be small enough to pass the screen S without damage to the above eductor or will be of such a small amount that the work of collecting debris can be carried out to the end, without deteriorating the performance caused by the flow impeded in screen S.
    [00012] The drawing is focused on removing more of the fine residues that, in the past, was carried out until screen S. Part of this focus on maintaining the input speed using the annular space 68. Then there is the first reversal of direction in the open volume 74 leading to wheel 82, which in the preferred embodiment rotates on its axis and accelerates the debris, including the fine ones radially outward, as the now spiraling flow current continues down the annular space 92 with the debris 98 rubbing the wall of the tube 96 until it lands on the stack 102 at the lower end of the chamber 64. Below the lower end of the outlet tube 84, the fluid stream reverses the direction to rise, as indicated by the arrow 100 and the debris that they are moving downward by the force of gravity, and rotate as indicated by arrows 104, they are now in a relatively quiescent area with little turbulence to allow debris 98 to continue its spiral descent.
    [00013] Apparatus 50 can be deployed in any orientation, although the closer to the vertical orientation, the better the performance for removing debris. For cleaning after removal from the underground site, the bottom 106 can be removed and the collected debris washed away. The turbine wheel 82 preferably rotates in response to the passing flow. Rotation is preferred since the pressure drop of the circulating fluid is less than in a static situation. However, the assembly will still take a turn for the liquid to flow even if the wheel, for whatever reason, is stuck with debris or has a bearing failure. The advantage of the rotating current flow will still be there to assist in the separation. As another alternative, the simple number of reversals of direction can also act as a separation technique to remove debris, even without the spin transmitted through the use of wheel 82. Clearly, adding the wheel and then allowing that it turns represent an improvement over relying only on directional reversals. Although reference is made to a wheel 82, which can resemble, for example, a closed impeller in a centrifugal pump or a turbine rotor, other structures that have an input sequence and transmit a rotation that are also contemplated for them . This can be as simple as a series of fixed or rotating baffles or other shapes that extend into a flow stream that transmits rotation to the flow, while not creating turbulence to the point of large pressure drops or speeds so high that erosion makes it a problem. Options for aligning impact surfaces with hardened material can be implemented keeping in mind that space considerations can dictate the thickness of any coating to protect the internal walls of the apparatus 50 from erosion from the impact of solids.
    [00014] The above description is illustrative of the preferred modality and various modifications can be made by those skilled in the art without departing from the invention, the scope of which must be determined from the literal and equivalent scope of the following claims.
    权利要求:
    Claims (22)
    [0001]
    1. Debris removal device for underground use operable to remove debris before production restarts using fluid flow pumped through a line that positions the debris removal device adjacent to the debris to remove debris with pumped flow to the removal device debris characterized by the fact that it comprises: an external housing (66) supported on a line for positioning against the debris to be removed and administration of fluid pumped to said housing, said housing (66) also having an annular inlet shape. open end for positioning in the debris to induce said debris to flow into said housing (66), said inlet located at a free end of said outer housing (66) so that said end can be placed on top of the debris ( 98) during operation and said housing (66) still comprising an outlet; an eductor for aspirating debris-laden liquid into said inlet; a debris collection chamber (64) in said housing (66); a fluid passage from said inlet to said outlet which reverses the direction at least once between said inlet and said outlet while being open at a location between said inlet and said outlet for debris to collect in said chamber debris collection (64); said passage is defined by an annular path (68) with an open end between said debris collection chamber (64) and said housing (66) that begins at said inlet to direct flow loaded with debris in a direction opposite to the direction of the debris removed that fits into said debris collection chamber (64).
    [0002]
    2. Device according to claim 1, characterized by the fact that: said inversion in the direction comprises a u-turn.
    [0003]
    Device according to claim 2, characterized by the fact that: said passage makes at least two u-turns between said entrance and said exit.
    [0004]
    4. Device according to claim 2, characterized by the fact that: said annular path (68) extends over and into an open upper part of said debris collection chamber (64).
    [0005]
    5. Device according to claim 4, characterized by the fact that it further comprises: an inlet tube (94) in said debris collection chamber (64) that conducts fluid from said annular path (68) and then into said debris collection chamber (64), said inlet tube (94) having opposite ends open.
    [0006]
    Device according to claim 5, characterized by the fact that: an outlet tube (84) extends from said outlet and at least in part to said inlet tube (94) and having opposite ends open.
    [0007]
    Device according to claim 6, characterized by the fact that it further comprises: a rotation-conferencing device (82) associated with said inlet tube (94) for turning the debris-laden fluid stream (98) against said inlet tube (94).
    [0008]
    8. Device according to claim 7, characterized by the fact that: said device that provides rotation (82) is rotationally mounted.
    [0009]
    Device according to claim 8, characterized by the fact that: said rotation-providing device (82) comprises a paddle wheel structure.
    [0010]
    10. Device according to claim 7, characterized by the fact that: said rotation-conferencing device (82) is movably mounted.
    [0011]
    11. Device according to claim 7, characterized by the fact that: said rotation-conferencing device (82) is stationary.
    [0012]
    12. Device according to claim 1, characterized by the fact that a rotation-inducing element in said passage to give rotation to the fluid that passes through said passage to assist in the removal of debris into said collection chamber debris (64).
    [0013]
    13. Device according to claim 12, characterized by the fact that: said rotation-checking device (82) is rotationally mounted.
    [0014]
    14. Device according to claim 13, characterized by the fact that: said rotation-providing device (82) comprises a paddle wheel structure.
    [0015]
    15. Device according to claim 12, characterized by the fact that: said rotation-conferencing device (82) is movably mounted.
    [0016]
    16. Device according to claim 12, characterized by the fact that: said rotation-conferencing device (82) is stationary.
    [0017]
    17. Device according to claim 12, characterized by the fact that: said fluid passage from said inlet to said outlet reverses the direction at least once between said inlet and said outlet.
    [0018]
    18. Device according to claim 17, characterized by the fact that: said reversal in the direction comprises a u-turn.
    [0019]
    19. Device according to claim 19, characterized by the fact that: said passage makes at least two u-turns between said inlet and said outlet.
    [0020]
    20. Device according to claim 18, characterized by the fact that: said annular path (68) extends over and into an open upper part of said debris collection chamber (64).
    [0021]
    21. Device according to claim 20, characterized by the fact that it further comprises: an inlet tube (94) in said debris collection chamber (64) that conducts fluid from said annular path (68) and then into said debris collection chamber (64), said inlet tube (94) having opposite ends open.
    [0022]
    22. Device according to claim 21, characterized in that: an outlet tube (84) extending from said outlet and at least in part to said inlet tube (94) and having opposite ends open.
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    同族专利:
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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| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: E21B 43/10 , E21B 21/07 , E21B 27/00 Ipc: E21B 27/00 (1968.09), E21B 37/00 (1968.09) |
    2019-10-22| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-01| B07A| Technical examination (opinion): publication of technical examination (opinion) [chapter 7.1 patent gazette]|
    2021-03-16| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-04-27| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 09/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/098,166|US8960282B2|2011-04-29|2011-04-29|Centrifugal subterranean debris collector|
    US13/098,166|2011-04-29|
    PCT/US2012/028401|WO2012148578A2|2011-04-29|2012-03-09|Centrifugal subterranean debris collector|
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