• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Plant for the metering of a powder polymer with a particle size of between 100 and 500 micrometers intended to feed a mixer (11) in hydraulic fracturing operations, comprising successively: a powdered polymer feedstock from a truck ( 1) pressurized rocker or big-bags emptied by pneumatic transport, - a means of transporting the powdered polymer fed by a compressor (3), and provided with a shut-off valve (4) of the polymer transport, - a receiving hopper (5) of the powdered polymer having a high level (6) and a low level (6), the hopper being equipped with a pneumatic unclogging dust filter, and means for controlling the valve of stopping and compressor according to the high and low levels, - a metering screw (7) of the powdered polymer, positioned at the lower end of the hopper (5), the screw being equipped with a variable speed motor and suitable to be ordered remote.
    公开号:FR3040893A1
    申请号:FR1558504
    申请日:2015-09-11
    公开日:2017-03-17
    发明作者:Emmanuel Pich；Marshall Bond
    申请人:SNF HOLDING Co；
    IPC主号:
    专利说明:

    EQUIPMENT AND METHOD FOR THE DIRECT USE OF POLYMER POWDER IN HYDRAULIC FRACTURING
    FIELD OF THE INVENTION
    The present invention relates to the dosing and addition of polymers in the field of hydraulic fracturing. More specifically, the subject of the present invention is a material for dosing and adding polymers used in hydraulic fracturing as a drag reducer.
    PRIOR STATE OF THE TECHNIQUE
    Hydraulic fracturing is intended to create additional permeability and generate larger gas or oil production areas at the bottom of wells. Indeed, the low permeability, the natural barriers of compact layers, waterproofing by drilling operations strongly limit the production of hydrocarbons. The gas or oil contained in the unconventional reservoir, can not easily migrate from the rock to the production well without stimulation.
    The development of hydraulic fracturing has been dependent on the use of polymers to reduce surface pumping pressures while maintaining the fracture pressure at the bottom of wells. This is called the drag reduction phenomenon.
    Deep well fracturing requires pressures of 70 to 200 bar with very large volumes of water. Surface pumps work at 300-600 bars on average. The addition of low doses of polymers, especially of the polyacrylamide type, makes it possible to fracture by greatly increasing the injected flow rate.
    This requires today to inject large amounts of polymers in 10 or 15 sequences over 2 or 3 days. These quantities can reach 10 tons for a fracturing operation.
    For reasons of ease of handling, for years, polyacrylamides have been used in emulsion form with the following disadvantages: - Transport of emulsion quantities three times greater than the amounts of active materials; - Cost almost doubled compared to powdered polymers; - Injections of hydrocarbons and surfactants more and more disputed by environmental groups; - Tendency for thickening, despite the addition of antifreeze, in areas with very cold winter. Recently, for cost and efficiency reasons, materials have been developed for dissolving powdered polymers on specialized trucks (WO2010 / 020698). This is particularly the case of PowderFrac ™ trucks using dispersing / grinding equipment, improving the suspension of these powders, their dissolution and pumping to the mixer (blender) used to feed the piston pump for fracturing. However, the equipment is expensive and requires a relatively specialized staff.
    There is therefore today a need for equipment for dosing and adding polymers having a lower cost and simplified use.
    SUMMARY OF THE INVENTION
    The present invention relates to a material for the metering of a powder polymer, used as a drag reducer, in a mixer supplying an injection pump for hydraulic fracturing operations.
    In general and known in the field of hydraulic fracturing, the mixer is a tank for mixing, in water or in brine, the polymer as well as all the other ingredients of an injection composition, as per Examples of dispersants, anti-corrosion agents, bactericides, oxidants, sand.
    The passage time of the polymer in the mixer is generally of the order of one minute.
    In general, the standard powders of polymers used in hydraulic fracturing, for example polyacrylamides, with a particle size of 0-1 mm, and very high molecular weights have a dissolution time of 1 to 1.5 hours.
    In fact, very often, these polyacrylamides are co-polymers whose dissolution rate is a function of their composition, their molecular weight and the production method.
    In the present invention, the particle size of the polymer (particle size) is between 100 and 500 microns, preferably between 150 and 300 microns.
    A selection criterion is that the dissolution time of the powdery polymer is less than the passage time in the mixer, or it is at most 30% higher.
    According to one aspect of the invention, 80 to 90% by weight of the polymer is dissolved in less than one minute.
    The remaining 10 to 20% are generally dissolved by mechanical effect of the piston pump, in the transport, injection or fracturing pipes which, in total, are between 2000 and 5000 meters of the dosing equipment according to the invention. .
    The second important parameter is to dose this powder directly into the mixer. The solution adopted is advantageously a pneumatic transport, which avoids any problem of freezing, when dissolved in water.
    The polymer arrives on fields normally in bulk trucks of 16 to 20 tons, unloaded by a tilting of the tank and an emptying by pressure of air. The polymer can arrive under another packaging, for example in big bag and an adaptation will be made according to the logistic conditions.
    In other words, the subject of the invention is an installation for the metering of a powder polymer with a particle size of between 100 and 500 micrometers intended to feed a mixer in hydraulic fracturing operations, comprising successively: polymer powder, from a pressurized rocking truck or big bags emptied by pneumatic transport, - a means of transporting the powder polymer fed by a compressor, and provided with a stop valve for the transport of polymer, a hopper for receiving the powdered polymer having a high level and a low level, the hopper being equipped with a pneumatic unclogging dust filter, as well as means for controlling the shut-off valve and the compressor according to the levels high and low, - a dosing screw of the powdered polymer, positioned at the lower end of the hopper, the screw being equipped with a variable speed motor iable and able to be controlled remotely.
    In a first embodiment, the hopper is arranged laterally relative to the mixer. In practice, it is located near the truck or big-bags. In this case, the installation further comprises a means of transporting the powdered polymer from the metering screw to the mixer. The means of transport preferably comprises an ejector, a compressor which feeds it, and a transport pipe. Thus, the powdered polymer is sent via the transport pipe into the mixer over a distance of 20 to 50 meters.
    According to this first embodiment, there is a risk of dust, especially in windy conditions. To avoid this, the installation may further comprise: either a wetting system for the polymer powder, comprising a tube and spray nozzles arranged at the free end of the transport pipe; either a receiving hopper with a powder outlet lock to prevent the dispersion of fines due to the transport air, or a cyclo-filter.
    Thus, on arrival above the mixer, the powder can be: - either ejected as it is in the mixer, - or wetted by the spray nozzles, - or treated to prevent the dispersion of fines due to the transport air passing through the receiving hopper equipped with a lock or by a cyclo filter.
    In a second embodiment, the hopper is positioned above the mixer. In this case the transport means between the screw and the mixer is not necessary. In practice, the hopper is fed sequentially from the truck by pneumatic transport and the powder is dosed from the hopper, for example with a rotary lock. Optionally the hopper is equipped with a filter to avoid putting fine polymer particles into the atmosphere.
    According to this second embodiment, the installation may further comprise the same wetting system of the powder polymer as described above.
    Another aspect of the invention relates to a process for assaying a powder polymer with a particle size of between 100 and 500 micrometers intended to feed a mixer in hydraulic fracturing operations of a subterranean formation implementing the plant described herein. -above.
    The method of hydraulic fracturing of a subterranean formation according to the invention comprises the following steps: feeding a powdery polymer having a particle size of between 100 and 500 micrometers, in the plant according to the invention, after dosing, supplying the powdered polymer in a mixer, - forming a mixture by dissolving the powdery polymer in the mixer, so that at least 80% by weight of the powdery polymer, preferably at least 90% is dissolved in less one minute, - injection of the resulting mixture into an underground formation. On arrival on the mixer, the powdered polymer can be: - ejected as such in the mixer, - or wetted by a wetting system of the powdered polymer, comprising a tube and spray nozzles arranged at the end free from the transport pipe, - be treated to prevent the dispersion of fines due to the transport air passing through the receiving hopper equipped with a lock or a cyclo filter.
    As already stated, a selection criterion is that the dissolution time of the powdered polymer is less than the mixing time in the mixer, or is at most 30% greater.
    The method according to the invention may further comprise a step of adding to the mixer other ingredients of a hydraulic fracturing injection composition, such as, for example, dispersants, anti-corrosions agents, bactericides, oxidizers , sand. This addition is usually done continuously to obtain a homogeneous mixture.
    Advantageously, the powder polymer used according to the invention comprises at least one nonionic monomer which is selected from the group comprising acrylamide, methacrylamide, hydroxyl acrylic acid esters of acrylic acid, hydroxylated alkyl esters. methacrylic acid, N-vinyl pyrrolidone, N-vinyl formamide and polyethylene glycol methacrylate. Preferably, the nonionic monomer is acrylamide
    Optionally, the powder polymer used according to the invention may comprise at least one anionic monomer which is selected from the group comprising acrylic acid, methacrylic acid, allyl sulfonic acid, 2-acrylamido-2-methyl acid propane sulfonic acid as free acids, or salts thereof.
    Optionally, the powder polymer used according to the invention may comprise at least one cationic monomer which is selected from the group comprising quaternized or salified ADAME, quaternized or salified MADAME, DADMAC, APTAC and MAPTAC.
    The molecular weight of the polymer used according to the invention is between 1 and 30 million daltons, preferably between 5 and 25 million daltons, more preferably between 15 and 25 million daltons.
    Preferably, the polymer used is an acrylamide (co) polymer. The invention and the advantages thereof will appear more clearly from the following figures and examples given to illustrate the invention and not in a limiting manner.
    DESCRIPTION OF THE FIGURES
    Figure 1 illustrates the steps of delivery, dosing, dissolution and injection of a powdered polymer in a hydraulic fracturing process according to a particular embodiment of the invention.
    FIG. 2A illustrates the wetting of a powdered polymer, added in a mixer, in a hydraulic fracturing process according to a particular embodiment of the invention.
    FIG. 2B illustrates the supply of a polymer in a mixer, in a hydraulic fracturing process according to a particular embodiment of the invention.
    FIG. 3 illustrates the steps of delivery, dosing, dissolution and injection of a powdered polymer in a hydraulic fracturing process according to a particular embodiment of the invention.
    DETAILED DESCRIPTION OF THE INVENTION
    The description of the equipment according to the invention is as follows:
    Figure 1 corresponds to the first embodiment.
    A bulk transport truck (1) with a tipping pressure tank (2) is press-drained by means of a compressor (3) into a hopper (5) via an on-off valve (4). ) controlled by the high and low levels (6) of the hopper (5). The dosing is done by a metering screw (7) equipped with a variable speed motor (8) controlled by a central control room.
    An ejector (9) fed by a compressor (10) sends the powder to the mixer (11) via a transport pipe. The mixer (11) is provided with a booster pump (12) of the injection pump (13).
    In the mixer (11), the powdery polymer is advantageously dissolved in less than one minute. Other ingredients of the injection composition may be added.
    In this case, to avoid dust, the feed of the mixer (11) can be done: - either by a wetting system where the powder is fed into a tube (14), and wetted with water or brine from the spray nozzles (15), (Figure 2A); - Or by a cyclofiltre (16) allowing the separation of the air ejected powder by a calibrated tube in the mixer. (Figure 2B).
    Figure 3 corresponds to the second embodiment.
    The truck (1) discharges the tank (2) with the compressor (3) into a hopper (5) located above the mixer via a valve (4) controlled by high and low levels (6) . The metering screw (7) with variable speed motor (8) is controlled by the main control room.
    The dosing equipment according to the invention has the following advantages. It can replace both: - emulsions, with lower cost and higher quality; - Powdered polymers dissolved in the mixer before injection with a much heavier material and higher price. Those skilled in the art may find similar means for applying the method.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Installation for the metering of a powder polymer with a particle size of between 100 and 500 micrometers intended to feed a mixer (11) in hydraulic fracturing operations, comprising successively: a powder polymer feed, originating from a pressurized rocking truck (1) or pneumatically emptied big bags, - means for transporting the powdered polymer fed by a compressor (3), and provided with a stop valve (4) for the transport of polymer, - a receiving hopper (5) of the powdered polymer having a high level (6) and a low level (6), the hopper being equipped with a pneumatic unclogging dust filter, and means for controlling the valve stop and compressor according to the high and low levels, - a dosing screw (7) of the powdered polymer, positioned at the lower end of the hopper (5), the screw being equipped with a variable speed motor and fit to be controlled remotely.
    [2" id="c-fr-0002]
    2. Installation according to claim 1, characterized in that when the hopper (5) is arranged laterally relative to the mixer (11), said installation further comprising a means of transporting the powdered polymer from the metering screw (7) until to the mixer (11).
    [3" id="c-fr-0003]
    3. Installation according to claim 2, characterized in that the transport means comprises an ejector (9), a compressor (10) which feeds, and a transport pipe.
    [4" id="c-fr-0004]
    4. Installation according to one of claims 2 or 3, characterized in that the installation further comprises: - either a wetting system of the powdered polymer, comprising a tube (14) and spray nozzles (15) arranged at the free end of the transport hose; - Or a receiving hopper with a powder outlet lock or a cyclo-filter (16) to prevent the dispersion of fines due to air transport.
    [5" id="c-fr-0005]
    5. Installation according to claim 1, characterized in that the hopper (5) is positioned above the mixer.
    [6" id="c-fr-0006]
    6. Installation according to claim 5, characterized in that the installation further comprises a wetting system of the powdered polymer, comprising a tube (14) and spray nozzles (15).
    [7" id="c-fr-0007]
    7. A method for determining a powdered polymer with a particle size of between 100 and 500 micrometers intended to feed a mixer in hydraulic fracturing operations of a subterranean formation using the plant according to one of claims 1 to 6.
    [8" id="c-fr-0008]
    8. Process according to claim 7, characterized in that the process comprises the following steps: feeding a powdery polymer having a particle size of between 100 and 500 microns, after dosing, supplying the powdered polymer in a mixer, - forming a mixture by dissolving the powdered polymer in the mixer, such that at least 80% by weight of the polymer powder is dissolved in less than one minute, - injecting the resulting mixture into a subterranean formation.
    [9" id="c-fr-0009]
    9. A method according to claim 8, characterized in that upon arrival on the mixer, the powdered polymer can be: - ejected as such in the mixer, - or wetted by a wetting system of the polymer powder, comprising a tube and spray nozzles, - is treated to prevent dispersion of fines due to transport air passing by either the receiving hopper equipped with a lock or by a cyclofilter.
    [10" id="c-fr-0010]
    10. Method according to one of claims 8 or 9, characterized in that the polymer has a particle size of between 150 and 300 micrometers.
    类似技术:
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    同族专利:
    公开号 | 公开日
    US20160168955A1|2016-06-16|
    EA201691586A1|2017-04-28|
    FR3040893B1|2017-09-15|
    CA2920029A1|2016-05-19|
    CN106522910B|2021-06-18|
    CN106522910A|2017-03-22|
    EA035257B1|2020-05-21|
    US10253596B2|2019-04-09|
    EP3141692A1|2017-03-15|
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    法律状态:
    2016-09-28| PLFP| Fee payment|Year of fee payment: 2 |
    2017-03-17| PLSC| Publication of the preliminary search report|Effective date: 20170317 |
    2017-09-29| PLFP| Fee payment|Year of fee payment: 3 |
    2017-10-20| TP| Transmission of property|Owner name: S.P.C.M. SA, FR Effective date: 20170920 |
    2018-09-26| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-27| PLFP| Fee payment|Year of fee payment: 5 |
    2020-09-29| PLFP| Fee payment|Year of fee payment: 6 |
    2021-09-27| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1558504A|FR3040893B1|2015-09-11|2015-09-11|EQUIPMENT AND METHOD FOR THE DIRECT USE OF POLYMER POWDER IN HYDRAULIC FRACTURING|FR1558504A| FR3040893B1|2015-09-11|2015-09-11|EQUIPMENT AND METHOD FOR THE DIRECT USE OF POLYMER POWDER IN HYDRAULIC FRACTURING|
    CA2920029A| CA2920029A1|2015-09-11|2016-02-05|Equipment and method enabling to directly use powder polymer in hydraulic fracturing|
    US15/049,889| US10253596B2|2015-09-11|2016-02-22|Equipment and method enabling to directly use powder polymer in hydraulic fracturing|
    EA201691586A| EA035257B1|2015-09-11|2016-09-06|Equipment and method allowing the direct use of powdered polymer in hydraulic fracturing|
    EP16187549.7A| EP3141692A1|2015-09-11|2016-09-07|Equipment and method allowing the direct use of powdered polymer in hydraulic fracturing|
    CN201610816223.4A| CN106522910B|2015-09-11|2016-09-09|Apparatus and method capable of directly utilizing powdered polymer in hydraulic fracturing|
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