CN109356562B - Underground sand-filtering type gas-liquid separation device - Google Patents
Underground sand-filtering type gas-liquid separation device Download PDFInfo
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- CN109356562B CN109356562B CN201811205605.9A CN201811205605A CN109356562B CN 109356562 B CN109356562 B CN 109356562B CN 201811205605 A CN201811205605 A CN 201811205605A CN 109356562 B CN109356562 B CN 109356562B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Abstract
The invention provides an underground sand-filtering gas-liquid separation device which is applied to gas-liquid-solid separation of liquid produced by an oil-gas well and an unconventional gas well. The underground gas-liquid separation device mainly comprises a double-pipe axial flow device, a cyclone separator, an axial flow separator and a straight wire sand filter, and is combined with an underground oil well pump to realize gas-liquid-solid integrated separation before produced liquid enters a pump, so that the problems of air lock, sand blocking and the like are effectively solved; the straight-wire sand filter adopts a sand filtering type straight-wire pipe to realize solid-liquid separation before liquid production enters the pump, the axial flow separator adopts a first-stage axial-flow type pore pipe to realize first-stage preliminary gas-liquid separation after the liquid production solid-liquid separation, the cyclone separator adopts a second-stage layered cyclone type multi-section pipe to realize second-stage gas-liquid separation of the liquid production, the double-pipe axial flow separator realizes the buffering of small bubble liquid production carried after the first-stage gas-liquid separation according to an inner axial flow pipe, and fine sand liquid after the second-stage gas-liquid separation is conveyed to the oil well pump through an outer axial flow pipe.
Description
Technical Field
The invention relates to a gas-liquid-solid integrated separation device for oil-gas wells and unconventional gas wells, in particular to a sand-filtering type, primary axial flow type and secondary layered spiral flow type underground gas-liquid separation device.
Background
In the exploitation of oil gas well and unconventional gas well of high gas-liquid ratio, gaseous existence will directly influence whole pumping system's efficiency, and when gas content was lower relatively, gaseous filling degree that mainly influences the oil-well pump makes the pump efficiency reduce, and when gas content was great, a large amount of gas got into the oil-well pump, improved the probability that airlock phenomenon took place greatly, simultaneously because the existence of solid particle such as sand grain or coal grain, also can appear sand card pump scheduling problem.
At present, special researches on underground gas-liquid-solid integrated separation devices are few, mainly including underground gas-liquid separators researched and developed aiming at the problem of degassing, the structures of the underground gas-liquid separators are also continuously improved, the underground gas-liquid separators are developed into a multi-cup equal-flow type from a conventional gravity type and a spiral type, the basic principles of the gas-liquid separators are designed based on the gravity action and the centrifugal action, wherein the conventional gravity separator is a natural gravity separator which utilizes the part below a sleeve perforation section as a pocket for gravity separation, and the separator is large in size; the eccentric design of the eccentric gravity separator changes the shape of the annulus, so that the annulus has larger space for gas-liquid separation, and the gas phase entering the separator is relatively reduced; the spiral separator is characterized in that a spiral blade is additionally designed on a central pipe of a gravity separator, the downward speed is generated by the gravity and the flow pressure of fluid, and the fluid slowly moves under the drainage of the spiral blade.
Therefore, on the basis of the existing gas-liquid separation feasibility technology, a novel gas-liquid-solid integrated separation device is developed according to the numerical simulation and simulation analysis results of gas-liquid two-phase flow and solid-liquid two-phase flow in an oil well pump and the field test results of the victory oil field oil-gas well and the Ordos basin unconventional gas well, and the device has important significance for solving the problems of field gas lock, sand blocking pump and the like and improving the efficiency of a mechanical production system.
Disclosure of Invention
In order to effectively solve the defects and shortcomings of the existing underground solid-liquid separation technology and gas-liquid separation technology, the invention aims to provide an underground sand filtration type gas-liquid separation device for gas-liquid-solid integrated separation of liquid produced by an oil-gas well and an unconventional gas well. The underground gas-liquid separation device adopts the sand filtering type straight wire pipe, the first-stage axial flow type pore pipe and the second-stage layered spiral-flow type multi-section pipe, and is combined with an underground oil well pump, so that gas-liquid-solid integrated separation before liquid production enters a pump can be realized, and the problems of air lock, sand blocking and the like are effectively solved.
The technical scheme adopted by the invention for solving the technical problem is to provide the underground sand-filtering type gas-liquid separation device, the underground gas-liquid separation device is integrally designed into a symmetrical pipe body structure and mainly comprises a double-pipe axial flow device, a cyclone separator, an axial flow separator and a straight wire sand filter. The underground gas-liquid separation device is connected to the bottom of an oil well pump through an outer axial flow pipe of a double-pipe axial flow device, the double-pipe axial flow device and a straight-wire sand filter are sequentially and coaxially arranged from top to bottom, a cyclone separator is placed into an inner axial flow pipe of the double-pipe axial flow device, an axial flow separator is placed into a pipe cavity of the straight-wire sand filter, and the cyclone separator and the axial flow separator are sequentially and coaxially arranged from top to bottom.
The straight wire sand filter adopts a sand filtering type straight wire pipe to realize solid-liquid separation before produced liquid enters a pump, and comprises a straight wire pipe sleeve and a straight wire thread. The straight thread buckle adopts a variable cross-section disc body with a thin upper part and a thick lower part, a clamping groove is formed at the cross-section change part of the straight thread buckle, the axial positioning of the lower end of the straight thread pipe sleeve is realized, and the difference value of the radius of the upper cross-section and the lower cross-section of the straight thread buckle is equal to the wall thickness of the straight thread pipe sleeve.
The straight wire pipe sleeve is formed by uniformly distributing straight wire bodies along the circumferential direction of the straight wire buckles, the upper end and the lower end of the straight wire pipe sleeve are respectively welded with the axial flow hoop and the straight wire buckles, and all the straight wire bodies are obliquely arranged, so that the straight wire pipe sleeve is in a V-shaped structure with a thick upper part and a thin lower part, the probability of collision between the straight wire sand filter and the pipe wall of the pipe sleeve in underground operation is reduced, and coarse sand grains filtered by the straight wire sand filter are guaranteed to be smoothly settled into the bottom pocket without being accumulated outside the straight wire pipe sleeve. The straight wire bodies are formed by rolling stainless steel wires, the cross sections of the straight wire bodies are isosceles trapezoids, and the wide sides of the straight wire bodies are arranged outwards, so that wire gaps formed between adjacent straight wire bodies are narrow outwards along the radial direction and wide inwards, and blockage caused by the fact that fine sand grains passing through the wire gaps along with production liquid are clamped at inlets of the wire gaps is avoided, and therefore the straight wire pipe sleeve has a self-cleaning function.
The solid-liquid separation process before the produced liquid enters the pump comprises the following steps that the straight-wire sand filter goes down the well along with the oil pipe column and the oil well pump and is suspended at a liquid production layer, produced liquid with sand particles flows through the straight-wire pipe sleeve, coarse sand particles larger than the thread gaps are filtered and smoothly settle to a well bottom pocket according to the V-shaped structure of the straight-wire pipe sleeve, and fine sand particles smaller than the thread gaps smoothly flow through the thread gaps along with the produced liquid according to the self-cleaning function of the straight-wire pipe sleeve and enter the annular space of the straight-wire pipe sleeve and the axial flow pore.
The axial flow separator adopts a first-stage axial flow pore pipe to realize first-stage primary gas-liquid separation after liquid-liquid solid-liquid separation, and comprises an axial flow hoop and an axial flow pore pipe.
The axial flow clamp adopts a variable cross-section thick-wall cylinder body, the upper part of the outer annular surface of the axial flow clamp is connected with the outer axial flow pipe through pipe threads, a clamping groove is formed in the cross-section change position of the lower part of the outer annular surface of the axial flow clamp, the axial positioning of the upper end of the straight wire pipe sleeve is realized, the straight wire sand filter and the outer axial flow pipe are connected into a whole, and meanwhile, the inner wall of the annular cavity of the axial flow clamp is connected with the axial flow pore pipe and the inner axial flow pipe.
The axial flow pore pipe adopts a semi-closed equal-diameter long pipe body, the inner wall of the annular cavity of the axial flow pore pipe is sequentially provided with a conical axial flow surface and a cylindrical axial flow surface from top to bottom, and the conical axial flow surface of the axial flow pore pipe adopts an inverted conical surface, so that the cross section area of a flow passage of the conical axial flow surface is continuously enlarged, and the flow velocity of produced liquid in the flow passage is gradually reduced. The pipe wall of the lower middle part of the columnar axial flow surface of the axial flow pore pipe is milled with deceleration holes which are arranged at equal intervals in a layered mode along the axial direction, so that the produced liquid entering the annular space of the straight wire pipe sleeve and the axial flow pore pipe has enough time to implement first-stage gas-liquid separation, then the produced liquid enters the pipe cavity of the axial flow pore pipe, meanwhile, the deceleration holes between adjacent layers are arranged in a staggered mode, and the deceleration holes in each layer are evenly distributed along the circumferential direction. The deceleration holes of the axial flow pore pipe are all conical surfaces, the pore channels of the deceleration holes are radially outwards thin and internally thick, the deceleration holes are obliquely arranged, the cross section area of the pore channels is continuously enlarged when the produced liquid flows through the deceleration holes of the axial flow pore pipe, and the flow rate of the produced liquid is gradually reduced.
The first stage of preliminary gas-liquid separation process includes that produced liquid carrying large bubbles enters annular spaces of the straight wire pipe sleeve and the axial flow pore pipe through a narrow outer wire seam and a wide inner wire seam, produced liquid flow pressure is reduced to complete preliminary gas-liquid separation, separated primary gas moves upwards and overflows from the wire seam on the upper portion of the straight wire pipe sleeve to enter the annular spaces of the oil pipe and the sleeve, meanwhile, produced liquid carrying small bubbles after separation flows downwards and enters a pipe cavity of the axial flow pore pipe after being decelerated through a small outer deceleration hole and a large inner deceleration hole, and then flows upwards continuously and enters the pipe cavity of the dual-pipe axial flow device after being decelerated by a conical axial flow surface of the axial flow pore pipe.
The cyclone separator adopts a second-stage layered cyclone multi-section pipe to realize second-stage gas-liquid separation of produced liquid, and comprises a gas guide pipe, a cyclone making pipe, a cyclone pipe and a liquid guide pipe.
The air duct and the liquid guide pipe are both T-shaped three-way pipes and are composed of inlet pipe sections and outlet pipe sections, the inlet pipe sections of the air duct are placed into the cyclone pipe, the inlet pipe sections of the liquid guide pipe are connected with the cyclone pipe through circumferential welding, the inlet pipe sections of the air duct and the liquid guide pipe are both coaxially arranged with the cyclone pipe and the cyclone pipe, the outlet pipe sections of the air duct and the liquid guide pipe are both horizontally arranged, and pipe threads are machined at two end parts of the outer annular surface of the outlet pipe sections of the air. The lower end of the inlet pipe section of the gas guide pipe is provided with an inverted cone-shaped groove so as to smoothly guide the separated secondary gas into the gas guide pipe. The two sides of the outlet pipe section of the liquid guide pipe are provided with tapered cyclone surfaces, so that the cyclone separator is communicated with annular spaces of the inner axial flow pipe and the outer axial flow pipe, and the tapered cyclone surfaces of the liquid guide pipe adopt tapered surfaces, so that the cross section area of a flow passage of the tapered cyclone surfaces is continuously enlarged, and the flow speed of fine sand liquid in the liquid guide pipe is gradually reduced.
The coil-making pipe consists of a coil-making conical pipe section and a coil-making column pipe section, and the coil-making pipe is welded with the gas-guide pipe through the coil-making conical pipe section and is welded with the spiral-flow pipe through the coil-making column pipe section. The inner and outer circular surfaces of the rotation-making conical pipe section of the rotation-making pipe are conical surfaces, and the diameters of the small end circular surfaces of the conical surfaces of the inner and outer circular surfaces of the rotation-making conical pipe section are equal to the diameters of the outer circular surfaces of the inlet pipe section of the air guide pipe. The pipe wall of the coil-making pipe section of the coil-making pipe is drilled with jet holes, the jet holes of the coil-making pipe are all circular holes, the hole wall of each jet hole is tangent to the inner wall of the annular cavity of the coil-making pipe section of the coil-making pipe, and the jet holes are obliquely arranged; meanwhile, the jet holes of the coil are arranged in two rows, the axis of each row of jet holes is positioned on the same vertical plane, the vertical plane where the axis of each jet hole is positioned passes through the axis of the coil, and the two rows of jet holes are arranged in a staggered manner, so that the produced liquid carrying small bubbles in the inner axial flow pipe is injected into the coil through the jet holes and forms a plurality of beams of rotating liquid flow.
The cyclone tube is by last cone section, center pillar section and lower cone section are constituteed, the last cone section of cyclone tube and the interior outer ring face of lower cone section all adopt the back taper, and the tapering of the back taper that the outer ring face belongs to in the last cone section is less than the tapering of the back taper that the outer ring face belongs to in the lower cone section, and the awl height of the back taper that the outer ring face belongs to in the last cone section is then greater than the awl height of the back taper that the outer ring face belongs to in the lower cone section, the tip disc diameter of the back taper that the inner ring face belongs to in the last cone section and the main aspects disc diameter of the back taper that the inner ring face belongs to in the lower cone section all equal the internal diameter of center pillar section simultaneously.
The second stage gas-liquid separation process is that the produced liquid with small bubbles in the inner axial flow pipe is injected into the coil making pipe through the jet hole to form a plurality of rotating liquid flows, then a plurality of rotating liquid flows are converged at the bottom of the inner wall of the annular cavity of the tube section of the cyclone column to finally form a layered cyclone, the layered cyclone enters the upper conical tube section and continues to rotate and separate at high speed, the separated gas is transported to the center of the cyclone tube and rises reversely to form a gas column, meanwhile, separated product liquid is gradually thrown to the pipe wall and flows into the middle column pipe section, and after the product liquid stays for a period of time, the product liquid swirls into the lower cone pipe section, the cross section of a flow passage in the lower cone pipe section is rapidly reduced so that the product liquid is continuously and rotationally separated in an accelerating way, and residual bubbles in the product liquid are transferred to the center of the cyclone pipe to form an ascending gas column and are converged with the gas column in the upper cone pipe section to form secondary gas, then the fine sand liquid is led out through the air duct, and the separated fine sand liquid is led out after being decelerated and rectified by an outlet pipe section of the liquid guide pipe.
The double-tube axial flow device realizes the buffer of small bubble produced liquid according to the inner axial flow tube, and transmits fine sand liquid to the oil well pump through the outer axial flow tube.
The inner axial flow pipe adopts an equal-diameter thin pipe body, the outer axial flow pipe adopts an equal-diameter thick pipe body, an annular space is formed between the inner axial flow pipe and the cyclone pipe and used for buffering small bubble produced liquid after first-stage gas-liquid separation, and an annular space is formed between the inner axial flow pipe and the outer axial flow pipe and used for conveying fine sand liquid after second-stage gas-liquid separation.
The diameter of the inner wall of the annular cavity of the inner axial flow pipe is equal to the diameter of the large-end circular surface of the inverted conical surface where the conical axial flow surface of the axial flow pore pipe is located, so that the produced liquid carrying small bubbles after the first-stage gas-liquid separation can be smoothly introduced into the annular cavity of the inner axial flow pipe. The upper part and the lower part of the inner axial flow pipe wall are respectively provided with circular bosses which are arranged in a layered mode, the circular bosses of the inner axial flow pipe are symmetrically arranged along the radial direction, a circular through hole is drilled in the central part of the circular bosses, and the circular bosses on the upper part and the lower part of the inner axial flow pipe are respectively provided with a gas pipe end cover and a liquid pipe end cover. The outer diameter of the outer axial flow pipe is equal to the diameter of the outer annular surface of the axial flow clamp, outer pipe threads are respectively lathed at the top of the outer axial flow pipe and the bottom of the inner axial flow pipe, inner pipe threads are lathed at the bottom of the outer axial flow pipe, a blind end flange plate is matched at the top of the inner axial flow pipe for sealing, and meanwhile, inclined holes which are symmetrically arranged along the radial direction are formed in the lower part of the outer pipe threads of the outer.
The exhaust pipe adopts the return bend, and the pipe diameter of exhaust pipe equals the pipe diameter of air duct export pipeline section, and the inboard and the trachea end cover of exhaust pipe pass through the pipe thread and link to each other, and the outside of exhaust pipe connects in the inclined hole of outer axial flow pipe through the mode of circumference welding, realizes keeping UNICOM between cyclone and oil pipe and the sheathed tube annular space from this.
The air pipe end cover and the liquid pipe end cover both adopt flange disc bodies, pipe threads are turned on two sides of the inner wall of the annular cavity of the air pipe end cover, pipe threads are turned on the inner side of the inner wall of the annular cavity of the liquid pipe end cover, and the diameter of the inner wall of the annular cavity of the liquid pipe end cover is equal to the diameter of the round surface of the large end of the conical surface where the conical rotational flow surface of the liquid guide pipe is located. The inner side of the air pipe end cover is respectively connected with the outlet pipe section of the air pipe, and the inner side of the liquid pipe end cover is respectively connected with the outlet pipe section of the liquid guide pipe, so that the cyclone separator is fixed in the inner axial flow pipe cavity.
The underground gas-liquid separation device has the technical effects that the underground gas-liquid separation device is integrally designed into a symmetrical pipe body structure, and is combined with an underground oil well pump, so that gas-liquid-solid integrated separation before produced liquid enters a pump can be realized, and the problems of air lock, sand blocking and the like are effectively solved; the straight-wire sand filter adopts a sand filtering type straight-wire pipe to realize solid-liquid separation before liquid production enters the pump, the axial flow separator adopts a first-stage axial-flow type pore pipe to realize first-stage preliminary gas-liquid separation after the liquid production solid-liquid separation, the cyclone separator adopts a second-stage layered cyclone type multi-section pipe to realize second-stage gas-liquid separation of the liquid production, the double-pipe axial flow separator realizes the buffering of small bubble liquid production carried after the first-stage gas-liquid separation according to an inner axial flow pipe, and fine sand liquid after the second-stage gas-liquid separation is conveyed to the oil well pump through an outer axial flow pipe.
Drawings
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following examples.
Fig. 1 is a typical structure diagram of a downhole sand-filtering type gas-liquid separation device according to the invention.
FIG. 2 is a schematic view of a straight wire sand filter in the downhole sand-filtering gas-liquid separation device.
Fig. 3 is a sectional view a-a of fig. 2.
FIG. 4 is a schematic view of a shaft separator in the downhole sand-filtering gas-liquid separator.
FIG. 5 is a schematic view of a cyclone separator in the downhole sand-filtering type gas-liquid separator.
Fig. 6 is a sectional view B-B of fig. 5.
FIG. 7 is a schematic diagram of a dual tubular axial flow device in the downhole sand-filtering type gas-liquid separation device.
FIG. 8 is a schematic diagram of a solid-liquid separation process before liquid production enters a pump of the downhole sand filtration type gas-liquid separation device.
FIG. 9 is a schematic diagram of two stages of gas-liquid separation before the produced liquid enters the pump of the downhole sand-filtering type gas-liquid separation device.
In the figure, 1-double-pipe axial flow device, 2-cyclone separator, 3-axial flow separator, 4-straight-wire sand filter, 5-straight-wire pipe sleeve, 6-straight-wire buckle, 7-axial flow clamp, 8-axial flow pore pipe, 9-air duct, 10-cyclone tube, 11-cyclone tube, 12-liquid guide pipe, 13-air exhaust pipe, 14-air pipe end cover, 15-outer axial flow pipe, 16-inner axial flow pipe and 17-liquid pipe end cover.
Detailed Description
In fig. 1, the underground sand-filtering gas-liquid separation device mainly comprises a double-pipe axial flow device 1, a cyclone separator 2, an axial flow separator 3 and a straight-wire sand filter 4, adopts a sand-filtering straight-wire pipe, a first-stage axial flow pore pipe and a second-stage layered cyclone multi-section pipe, and is combined with an underground oil well pump, so that gas-liquid-solid integrated separation before liquid production enters the pump can be realized, and the problems of air lock, sand blocking and the like are effectively solved.
In fig. 1, the underground sand-filtering gas-liquid separator is integrally designed as a symmetrical pipe structure, and is connected to the bottom of an oil-well pump through an outer axial flow pipe of a dual-pipe axial flow device 1, the dual-pipe axial flow device 1 and a straight-wire sand filter 4 are coaxially arranged from top to bottom in sequence, a cyclone separator 2 is arranged in the inner axial flow pipe of the dual-pipe axial flow device 1, an axial flow separator 3 is arranged in a pipe cavity of the straight-wire sand filter 4, and the cyclone separator 2 and the axial flow separator 3 are coaxially arranged from top to bottom in sequence.
In fig. 1, before the downhole sand-filtering gas-liquid separation device is assembled, the surface of the outer axial flow pipe of the dual-tubular flow device 1 is subjected to paint spraying and corrosion prevention treatment, the inner walls of the annular cavities of the outer axial flow pipe and the inner axial flow pipe of the dual-tubular flow device 1, the inner walls of the annular cavities of the swirl pipe and the swirl pipe of the cyclone separator 2 and the inner wall of the annular cavity of the axial flow pore pipe of the axial flow separator 3 are respectively subjected to chemical plating treatment, the outer annular surfaces of the swirl pipe and the swirl pipe of the cyclone separator 2 and the outer annular surface of the axial flow pore pipe of the axial flow separator 3 are respectively subjected to spray welding treatment, the inner walls of the swirl pipe and the swirl pipe of the cyclone separator 2 and the axial flow pore pipe of the axial flow separator 3 are kept clean, and finally, whether the air duct of the cyclone separator 2 and the straight wire pipe sleeve of the straight wire sand filter 4 are damaged.
In fig. 1, when the downhole sand-filtering gas-liquid separation device is assembled, the cyclone separator 2 is connected into the inner axial flow pipe cavity of the dual-pipe axial flow device 1 through the gas guide pipe and the liquid guide pipe, the inner axial flow pipe of the dual-pipe axial flow device 1 is connected into the outer axial flow pipe cavity through the gas guide pipe, then the axial flow clamp of the axial flow separator 3 connects the axial flow pore pipe with the outer axial flow pipe and the inner axial flow pipe of the dual-pipe axial flow device 1 into a whole through pipe threads, and the straight wire pipe sleeve of the straight wire sand filter 4 is connected to the straight wire buckle and the axial flow clamp of the axial flow separator 3 through a circumferential welding mode.
In fig. 2 and 3, the specification of the straight wire sleeve 5 in the straight wire sand filter 4 is consistent with that of the oil well pump barrel, and the length of the straight wire sleeve 5 and the width of the wire gap are selected according to factors such as the formation fluid production amount, the fluid production sand carrying amount, the sand grain size and the like.
In fig. 2 and 3, the straight-wire sand filter 4 adopts a sand-filtering straight-wire pipe to realize solid-liquid separation before liquid production enters a pump, and comprises a straight-wire pipe sleeve 5 and a straight-wire buckle 6, wherein straight-wire bodies are uniformly distributed along the circumferential direction of the straight-wire buckle 6 to form the straight-wire pipe sleeve 5, the straight-wire pipe sleeve 5 is in a V-shaped structure with a thick upper part and a thin lower part, and simultaneously, a wire seam is narrow along the radial direction and is wide in the radial direction, so that the straight-wire pipe sleeve 5 has a self-cleaning function.
In fig. 4, the specification of the axial flow pore pipe 8 in the axial flow separator 3 is consistent with that of the straight filament pipe sleeve 5, the length of the axial flow pore pipe 8 is adjusted according to the length of the straight filament pipe sleeve 5, the specific position of the deceleration hole of the axial flow pore pipe 8 at the middle lower part of the pipe wall is designed according to factors such as the stratum liquid production amount and the large bubble amount carried in the produced liquid, and the number and the aperture of the deceleration hole of the axial flow pore pipe 8 are designed according to factors such as the liquid production amount of the small bubbles carried after the first stage of gas-liquid separation.
In fig. 4, the axial flow separator 3 adopts a first-stage axial flow type pore pipe to realize first-stage preliminary gas-liquid separation after liquid-liquid separation, and comprises an axial flow clamp 7 and an axial flow pore pipe 8, the axial flow clamp 7 connects the straight wire sand filter 4 and the axial flow pore pipe 8 with an inner axial flow pipe and an outer axial flow pipe of the dual-pipe axial flow device 1 into a whole, a deceleration hole of the axial flow pore pipe 8 is positioned at the middle lower part of the pipe wall to ensure that the produced liquid entering the annular space of the straight wire pipe sleeve 5 and the axial flow pore pipe 8 has enough time to implement the first-stage gas-liquid separation, and simultaneously, the produced liquid carrying large bubbles is separated into first-stage gas and the produced liquid carrying small bubbles.
In fig. 5 and 6, the sizes of the cyclone tube 10 and the cyclone tube 11 in the cyclone separator 2 are selected according to factors such as the amount of produced liquid after the first-stage gas-liquid separation and the amount of small bubbles carried in the produced liquid, the number and the aperture of the jet holes in the cyclone tube 10 are designed according to factors such as the amount of produced liquid of the small bubbles carried after the first-stage gas-liquid separation, the tube diameter of the gas guide tube 9 is designed according to factors such as the flow of the second-stage gas after the second-stage gas-liquid separation, and the tube diameter of the liquid guide tube 12 is designed according to factors such as the flow of the fine sand liquid after the second-stage gas-liquid separation.
In fig. 5 and fig. 6, the cyclone separator 2 adopts a second-stage layered cyclone multi-segment tube to realize second-stage gas-liquid separation of produced liquid, and comprises a gas-guide tube 9, a cyclone tube 10, a cyclone tube 11 and a liquid-guide tube 12, wherein an inlet tube section of the gas-guide tube 9 is provided with an inverted cone-shaped groove to smoothly introduce separated second-stage gas, two sides of an outlet tube section of the liquid-guide tube 12 are provided with tapered cyclone surfaces to decelerate and rectify separated fine sand liquid and then discharge the rectified fine sand liquid, produced liquid carrying small bubbles in an inner axial flow tube of the dual-tube tubular flow device 1 is injected into the cyclone tube 10 through a jet hole to form a plurality of rotating liquid flows, layered cyclones in an upper cone tube section and a lower cone section of the cyclone tube 11 are rotated and separated in a segmented accelerating manner, and the produced liquid carrying small bubbles is separated into second-.
In fig. 7, the size of the annular space between the outer axial flow tube 15 and the inner axial flow tube 16 in the dual-tubular axial flow device 1 is designed according to factors such as the amount of liquid produced by the small bubbles after the first-stage gas-liquid separation and the time required for buffering the liquid produced by the small bubbles, the size of the annular space between the inner axial flow tube 16 and the cyclone tube 10 and 11 is designed according to factors such as the flow rate of the fine sand liquid after the second-stage gas-liquid separation and the flow rate required for transporting the fine sand carried by the fine sand liquid, and the diameter of the exhaust tube 13 is adjusted according to the diameter of the gas guide tube 9.
In fig. 7, the dual-tube axial flow device 1 includes an exhaust pipe 13, a gas pipe end cover 14, an outer axial flow pipe 15, an inner axial flow pipe 16 and a liquid pipe end cover 17, the dual-tube axial flow device 1 achieves buffering of small bubble-carrying produced liquid according to an annular space between the inner axial flow pipe 16 and the cyclone tube 10 and the cyclone tube 11, and delivers fine sand liquid to an oil well pump through the annular space between the outer axial flow pipe 15 and the inner axial flow pipe 16, two sides of the exhaust pipe 13 are respectively connected with the gas pipe end cover 14 and the outer axial flow pipe 15 to achieve communication between the cyclone separator 2 and the annular space between the oil pipe and the casing, and the liquid pipe end cover 17 is connected with the liquid guide pipe 12 to achieve communication between the cyclone separator 2 and the annular space between the outer axial flow pipe.
In fig. 8, in the solid-liquid separation process before the produced liquid of the downhole sand filtration type gas-liquid separation device enters the pump, the straight wire sand filter 4 goes down the well along with the oil pipe column and the oil well pump and is suspended at the liquid production level, the produced liquid with sand produced in the stratum is fully settled in the annular space of the oil pipe and the casing at first, then the produced liquid enters the pump and carries sand to flow through the straight wire sand filter 4, coarse sand larger than the thread gap of the straight wire pipe sleeve 5 is filtered out at first, and is settled to a pocket at the bottom of the well along with the produced liquid in the annular space of the oil pipe and the casing according to the V-shaped structure of the straight wire pipe sleeve 5, and meanwhile, fine sand smaller than the thread gap flows through the thread gap along with the produced liquid according to the self-cleaning function of the straight wire pipe sleeve 5 and enters the annular space of the straight.
In fig. 9, in the two-stage gas-liquid separation process before the produced fluid of the downhole sand-filtering type gas-liquid separation device enters the pump, the produced fluid carrying large bubbles enters the annular space of the straight wire pipe sleeve 5 and the axial flow pore pipe 8 through the narrow outer wire seam and the wide inner wire seam, the pressure of the produced fluid is reduced to complete the preliminary gas-liquid separation, the separated primary gas moves towards the direction opposite to the flow of the produced fluid, overflows from the wire seam on the upper part of the straight wire pipe sleeve 5 to enter the annular space of the oil pipe and the sleeve, and is finally output through the wellhead device and the gas transmission pipe manifold; meanwhile, the separated product liquid carrying small bubbles flows downwards in the annular space of the straight wire pipe sleeve 5 and the axial flow pore pipe 8, and enters the pipe cavity of the axial flow pore pipe 8 after being decelerated by the external thin and internal thick deceleration holes on the pipe wall of the axial flow pore pipe 8, and the separated product liquid carrying small bubbles continuously flows upwards in the axial flow pore pipe 8 and enters the annular space between the inner axial flow pipe 16 and the cyclone pipe 10 and the cyclone pipe 11 after being decelerated by the conical axial flow surface of the axial flow pore pipe 8, so that the first-stage primary gas-liquid separation after the liquid-liquid separation is implemented.
In fig. 9, in the two-stage gas-liquid separation process before the produced liquid of the downhole sand filtration type gas-liquid separation device enters the pump, the produced liquid carrying small bubbles is fully buffered in the inner axial flow pipe 16, and then enters the cyclone separator 2 through the jet holes on the pipe wall of the cyclone 10, and a plurality of rotating liquid flows are formed on the inner wall of the annular cavity of the cyclone 10, and then the plurality of rotating liquid flows continuously flow downwards along the inner wall of the annular cavity of the cyclone 10 in a rotating manner and are converged at the bottom of the inner wall of the annular cavity of the cyclone pipe section in the cyclone 10 to form layered cyclone; then, the layered rotational flow enters an upper conical pipe section of the rotational flow pipe 11, the taper of an inverted cone on which the inner ring surface of the upper conical pipe section of the rotational flow pipe 11 is located is small, the layered rotational flow continuously rotates at a high speed and starts gas-liquid separation, the separated gas moves to the central part of the upper conical pipe section of the rotational flow pipe 11 and reversely rises to form a gas column, and meanwhile, separated produced liquid is gradually thrown to the pipe wall of the upper conical pipe section of the rotational flow pipe 11 and flows into a middle column pipe section of the rotational flow pipe 11; then, the separated product liquid stays for a period of time in the center pillar section of the cyclone tube 11 and swirls into the lower cone section of the cyclone tube 11, the taper of the inverted conical surface of the inner annular surface of the lower cone section of the cyclone tube 11 is larger, the cross section of the swirling flow channel of the separated product liquid is rapidly reduced, so that the product liquid continuously accelerates and rotates in the lower cone section of the cyclone tube 11 and continues gas-liquid separation, the residual bubbles in the product liquid are transported to the central part of the lower cone section of the cyclone tube 11 and form a gas column, then reversely ascend and are converged with the gas column in the upper cone section of the cyclone tube 11 to form a secondary gas, the secondary gas is guided out through the gas guide tube 9 and is conveyed to the annular space between the oil tube and the sleeve through the gas discharge tube 13, meanwhile, the separated fine sand liquid is decelerated and rectified through the outlet of the liquid guide tube 12 and then guided to the annular space between the outer shaft flow tube 15 and the inner shaft, thereby carrying out the second stage gas-liquid separation after the liquid production solid-liquid separation.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode and the like of each component can be changed, and all equivalent changes and improvements made on the basis of the technical scheme of the present invention should not be excluded from the protection scope of the present invention.
Claims (9)
1. The utility model provides a sand filtering formula gas-liquid separation in pit, its global design is symmetrical body structure, and two tubular shaft stream wares and straight silk sand screen from top to bottom arrange with the axle center in proper order, and the lumen of straight silk sand screen is put into to interior axial flow pipe and the axial flow separator of two tubular shaft stream wares to the cyclone, and cyclone and axial flow separator from top to bottom arrange its characterized in that with the axle center in proper order:
a wire sand screen; the straight wire sand filter adopts a sand filtering type straight wire pipe to realize solid-liquid separation before liquid is pumped, and comprises a straight wire pipe sleeve and a straight wire thread; the straight thread adopts a variable cross-section disc body with a thin upper part and a thick lower part, the straight thread pipe sleeve is formed by straight thread bodies which are uniformly distributed along the circumferential direction of the straight thread, all the straight thread bodies are obliquely arranged, so that the straight thread pipe sleeve is in a V-shaped structure with the thick upper part and the thin lower part, and a thread seam formed between the adjacent straight thread bodies is radially outward narrow and inward wide, so that the straight thread pipe sleeve has a self-cleaning function;
an axial flow separator; the axial flow separator adopts a first-stage axial flow pore pipe to realize first-stage preliminary gas-liquid separation after liquid-producing solid-liquid separation, and comprises an axial flow hoop and an axial flow pore pipe; the axial flow clamp adopts a variable cross-section thick-wall cylinder body, a clamping groove is formed at the cross-section change position at the lower part of the outer ring surface of the axial flow clamp, the axial flow pore pipe adopts a semi-closed equal-diameter long pipe body, a conical axial flow surface and a cylindrical axial flow surface are sequentially arranged on the inner wall of the ring cavity of the axial flow pore pipe from top to bottom, deceleration holes which are arranged in layers at equal intervals along the axial direction are milled on the pipe wall of the middle lower part of the cylindrical axial flow surface of the axial flow pore pipe, and the pore channel of the deceleration holes of the axial flow pore pipe;
a cyclone separator; the cyclone separator adopts a second-stage layered cyclone multi-section pipe to realize second-stage gas-liquid separation of produced liquid, and comprises a gas guide pipe, a cyclone making pipe, a cyclone pipe and a liquid guide pipe; the air guide pipe and the liquid guide pipe are both T-shaped three-way pipes and consist of an inlet pipe section and an outlet pipe section, the lower end of the inlet pipe section of the air guide pipe is provided with an inverted cone-shaped groove, and two sides of the outlet pipe section of the liquid guide pipe are provided with cone-shaped rotational flow surfaces; the coil-making pipe consists of a coil-making conical pipe section and a coil-making column pipe section, wherein jet holes are drilled in the pipe wall of the coil-making column pipe section of the coil-making pipe, and two rows of jet holes are arranged in a staggered manner; the cyclone tube consists of an upper conical tube section, a middle column tube section and a lower conical tube section, and the inner and outer annular surfaces of the upper conical tube section and the lower conical tube section of the cyclone tube are respectively provided with an inverted cone;
a dual-tube axial flow device; the double-tube axial flow device realizes the buffer of the produced liquid carrying small bubbles according to the inner axial flow tube and transmits the fine sand liquid to the oil well pump through the outer axial flow tube, and the double-tube axial flow device comprises the inner axial flow tube, the outer axial flow tube, an exhaust pipe, an air pipe end cover and a liquid pipe end cover; the inner axial flow pipe is an equal-diameter thin pipe body, the outer axial flow pipe is an equal-diameter thick pipe body, an annular space is formed between the inner axial flow pipe and the cyclone pipe, the annular space is formed between the inner axial flow pipe and the outer axial flow pipe, circular bosses which are arranged in layers are arranged on the upper portion and the lower portion of the pipe wall of the inner axial flow pipe respectively, a gas pipe end cover and a liquid pipe end cover are arranged on the upper portion and the lower portion of the pipe wall of the inner axial flow pipe respectively, inclined holes which are symmetrically arranged in the radial direction are arranged on the lower portion of the outer pipe thread of the.
2. The downhole sand-screened gas-liquid separator as recited in claim 1, further comprising: the underground sand-filtering gas-liquid separation device is connected to the bottom of the oil well pump through an outer axial flow pipe of the double-pipe axial flow device;
the solid-liquid separation process before the produced liquid enters the pump of the underground sand-filtering type gas-liquid separation device comprises the following steps that the produced liquid carries sand grains to flow through the straight wire pipe sleeve, coarse sand grains larger than the wire seams are filtered out and are smoothly settled to a pocket at the bottom of the well according to the V-shaped structure of the straight wire pipe sleeve, and fine sand grains smaller than the wire seams smoothly flow through the wire seams along with the produced liquid according to the self-cleaning function of the straight wire pipe sleeve and enter the annular space of the straight wire pipe sleeve and the axial flow pore pipe.
3. The downhole sand-screened gas-liquid separator as recited in claim 1, further comprising: a clamping groove is formed at the section change position of a straight thread in the straight thread sand filter, the axial positioning of the lower end of the straight thread pipe sleeve is realized, and the difference value of the upper and lower section radiuses of the straight thread is equal to the pipe wall thickness of the straight thread pipe sleeve;
the upper end and the lower end of a straight wire pipe sleeve in the straight wire sand filter are respectively welded with the axial flow hoop and the straight wire buckle, a straight wire body is formed by rolling a stainless steel wire, the cross section of the straight wire body is in an isosceles trapezoid shape, and the wide side of the straight wire body is arranged outwards.
4. The downhole sand-screened gas-liquid separator as recited in claim 1, further comprising: the upper part of the outer annular surface of an axial flow hoop in the axial flow separator is connected with an outer axial flow pipe through pipe threads, and a clamping groove at the lower part of the outer annular surface of the axial flow hoop realizes the axial positioning of the upper end of a straight wire pipe sleeve, so that the straight wire sand filter and the outer axial flow pipe are connected into a whole, and meanwhile, the inner wall of an annular cavity of the axial flow hoop connects an axial flow pore pipe and an inner axial flow pipe into a whole through pipe threads;
the tapered axial flow surface of the axial flow pore pipe in the axial flow separator adopts an inverted conical surface, so that the cross section area of a flow passage of the tapered axial flow surface is continuously enlarged, and the flow velocity of produced liquid in the tapered axial flow surface is gradually reduced; the deceleration holes between adjacent layers on the tube wall of the axial flow pore tube are arranged in a staggered mode, the deceleration holes in each layer are uniformly distributed along the circumferential direction, the deceleration holes of the axial flow pore tube are conical surfaces, the deceleration holes are obliquely arranged, the cross section area of a pore passage is continuously enlarged when the produced liquid flows through the deceleration holes of the axial flow pore tube, and meanwhile, the flow speed of the produced liquid is gradually reduced.
5. The downhole sand-screened gas-liquid separator as recited in claim 1, further comprising: the first-stage preliminary gas-liquid separation process of the underground sand-filtering type gas-liquid separation device comprises the steps that produced liquid carrying large bubbles enters annular spaces of the straight-wire pipe sleeve and the axial-flow pore pipe through a narrow outer wire seam and a wide inner wire seam, the pressure of the produced liquid flow is reduced to complete preliminary gas-liquid separation, separated primary gas moves upwards and overflows from the wire seam on the upper portion of the straight-wire pipe sleeve to enter the annular spaces of the oil pipe and the sleeve, meanwhile, the produced liquid carrying small bubbles after separation flows downwards and enters a pipe cavity of the axial-flow pore pipe after being decelerated through a fine outer deceleration hole and a coarse inner deceleration hole, and then flows upwards continuously and enters the pipe cavity of the double-tubular-shaft flow device after being decelerated through a conical axial flow surface of the axial-flow pore pipe.
6. The downhole sand-screened gas-liquid separator as recited in claim 1, further comprising: the inlet pipe section of the air duct in the cyclone separator is placed in the cyclone tube, the inlet pipe section of the liquid guide tube is connected with the cyclone tube through circumferential welding, the inlet pipe sections of the air duct and the liquid guide tube are coaxially arranged with the cyclone tube and the cyclone tube, the outlet pipe sections of the air duct and the liquid guide tube are horizontally arranged, the air duct smoothly guides the separated secondary gas into the air duct through an inverted cone-shaped groove, the conical cyclone surface of the liquid guide tube adopts a conical surface, so that the cross-sectional area of a flow passage of the conical cyclone surface is continuously enlarged, and the flow velocity of fine sand liquid in the liquid guide tube is gradually reduced;
the cyclone separator is characterized in that a rotation making pipe of the cyclone separator is welded with the gas guide pipe through a rotation making conical pipe section and is welded with the cyclone pipe through a rotation making column pipe section, the inner and outer annular surfaces of the rotation making conical pipe section of the rotation making pipe adopt conical surfaces, and the diameters of the small end circular surfaces of the conical surfaces of the inner and outer annular surfaces of the rotation making conical pipe section are equal to the diameters of the outer annular surfaces of the inlet pipe section of the gas guide pipe; the jet holes of the coil pipe are all circular holes, the hole wall of each jet hole is tangent to the inner wall of the annular cavity of the coil pipe section of the coil pipe, the jet holes are obliquely arranged, the jet holes of the coil pipe are arranged in two rows, the axis of each row of jet holes is positioned on the same vertical plane, and the vertical plane where the axis of each jet hole is positioned is the axis of the coil pipe.
7. The downhole sand-screened gas-liquid separator as recited in claim 1, further comprising: the conicity of the inverted cone where the inner and outer ring surfaces of the upper conical pipe section of the cyclone pipe in the cyclone separator are located is smaller than that of the inverted cone where the inner and outer ring surfaces of the lower conical pipe section are located, the conical height of the inverted cone where the inner and outer ring surfaces of the upper conical pipe section are located is larger than that of the inverted cone where the inner and outer ring surfaces of the lower conical pipe section are located, and meanwhile, the diameter of the small-end circular surface of the inverted cone where the inner ring surface of the upper conical pipe section is located and the diameter of the large-end circular surface of the inverted cone where the inner ring surface of the lower conical pipe section is;
the second stage gas-liquid separation process of the underground sand-filtering gas-liquid separation device comprises the following steps that the produced liquid carrying small bubbles in the inner axial flow pipe is injected into the coil-making pipe through the jet holes to form a plurality of rotating liquid flows, then a plurality of rotating liquid flows are converged at the bottom of the inner wall of the annular cavity of the tube section of the cyclone column to finally form a layered cyclone, the layered cyclone enters the upper conical tube section and continues to rotate and separate at high speed, the separated gas is transported to the center of the cyclone tube and rises reversely to form a gas column, meanwhile, separated product liquid is gradually thrown to the pipe wall and flows into the middle column pipe section, and after the product liquid stays for a period of time, the product liquid swirls into the lower cone pipe section, the cross section of a flow passage in the lower cone pipe section is rapidly reduced so that the product liquid is continuously and rotationally separated in an accelerating way, and residual bubbles in the product liquid are transferred to the center of the cyclone pipe to form an ascending gas column and are converged with the gas column in the upper cone pipe section to form secondary gas, then the fine sand liquid is led out through the air duct, and the separated fine sand liquid is led out after being decelerated and rectified by an outlet pipe section of the liquid guide pipe.
8. The downhole sand-screened gas-liquid separator as recited in claim 1, further comprising: the diameter of the inner annular cavity wall of an inner axial flow pipe in the double-pipe axial flow device is equal to the diameter of a large-end circular surface of an inverted conical surface where a conical axial flow surface of the axial flow pore pipe is located, a circular boss of the inner axial flow pipe is symmetrically arranged in the radial direction, a circular through hole is drilled in the central part of the circular boss, the outer diameter of the outer axial flow pipe is equal to the diameter of the outer annular surface of the axial flow clamp, outer pipe threads are respectively machined at the top of the outer axial flow pipe and the bottom of the inner axial flow pipe, inner pipe threads are machined at the bottom of the outer axial flow pipe.
9. The downhole sand-screened gas-liquid separator as recited in claim 1, further comprising: the pipe diameter of an exhaust pipe in the double-pipe axial flow device is equal to that of an outlet pipe section of the gas guide pipe, the inner side of the exhaust pipe is connected with an end cover of the gas pipe through pipe threads, and the outer side of the exhaust pipe is connected to an inclined hole of an outer axial flow pipe in a circumferential welding mode, so that the cyclone separator is communicated with annular spaces of the oil pipe and the sleeve;
pipe threads are lathed on two sides of the inner wall of the annular cavity of the air pipe end cover in the double-pipe axial flow device, pipe threads are lathed on the inner side of the inner wall of the annular cavity of the liquid pipe end cover, and the diameter of the inner wall of the annular cavity of the liquid pipe end cover is equal to the diameter of the round surface of the large conical end where the conical swirling surface of the liquid guide pipe is located; the inner side of the air pipe end cover is respectively connected with the outlet pipe section of the air pipe, and the inner side of the liquid pipe end cover is respectively connected with the outlet pipe section of the liquid guide pipe, so that the cyclone separator is fixed in the inner axial flow pipe cavity.
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| CN110342602B (en) * | 2019-07-18 | 2022-01-25 | 中国石油集团渤海钻探工程有限公司 | Self-rotating flow degassing device for oil and gas well waste gas treatment |
| US11617977B2 (en) * | 2020-02-04 | 2023-04-04 | SONUS Engineered Solutions | Particle separator nozzles and methods |
| CN111485866B (en) * | 2020-04-02 | 2022-05-13 | 中国石油集团渤海钻探工程有限公司 | Experimental system and experimental method for cyclone oil-water separation |
| US11371332B2 (en) | 2020-04-17 | 2022-06-28 | Saudi Arabian Oil Company | Sand accumulators to aid downhole pump operations |
| CN114917706A (en) * | 2021-02-03 | 2022-08-19 | 中国石油天然气集团有限公司 | Multi-stage cyclone coalescence circulating hydrogen hydrocarbon remover |
| CN113187460B (en) * | 2021-04-16 | 2022-04-19 | 东北石油大学 | Shale oil production underground rotational flow gravity coupling driving type gas-liquid separation device |
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