High-argillaceous oil well pumping and drainage process pipe column

Abstract

The utility model discloses a pumping and drainage process pipe column for a high-mud oil well, and relates to the technical field of borehole flushing methods or devices, a sand pumping pipe mechanism of the pumping and drainage process pipe column comprises a traveling valve and a piston pull pipe which are axially connected from top to bottom, and a sand pumping pump mechanism comprises a pump cylinder, a valve-free piston, a fixed valve and an exhaust centralizing assembly, the valve-free piston is connected to the lower end of the piston pull pipe and arranged in the pump cylinder in a sliding mode in the axial direction, the exhaust centralizing assembly is arranged at the upper end of the pump cylinder, the fixed valve is connected to the lower end of the pump cylinder, and the suspension anchoring mechanism supports the fixed valve. The valve-free piston axially slides in the pump cylinder to pump well fluid with high mud and sand content, the mud and sand pumping capacity is large, operation is continuous, and the pumping and discharging efficiency is high; compared with an existing sand washing and sand pumping technology, the sand washing liquid is prevented from polluting an oil layer, the water content recovery period is shortened, and the sand prevention validity period is prolonged; in the pumping and draining process, the mud and sand content and the water content in discharged liquid can be sampled and analyzed, and accurate data are provided for follow-up operation.

Description

Technical Field

[0001] The utility model relates to a method or equipment for flushing a wellbore, in particular to a high-mud oil well pumping and drainage process pipe column. Background Art

[0002] According to the core, logging, analytical and testing data and logging combination characteristics of the Laohekou Oilfield, the Guantao Formation is a fluvial deposit, and the 0-6 sand groups in the upper Guantao section are a set of meandering river deposits with "mud-encased sand" deposits, mainly gradual suspension and uniform suspension. The filling materials include matrix and cement. The matrix is ​​mainly mud, with an average content of about 15%, reaching 20% ​​in the beach area. The cement is mainly quartz and calcite, containing a small amount of pyrite.

[0003] For oil wells with high muddy reservoirs, the measures to support the wells are usually pump inspection and sand prevention. Before pump inspection and sand prevention, the mud and sand in the well need to be removed. There are two main processes for removing mud and sand: one is the sand flushing process, which is greatly limited by the reservoir pressure and its physical properties. The sand-carrying capacity of the return fluid of the sand flushing is weak, which is limited to removing the mud and sand in the wellbore, and cannot remove the mud and sand in the reservoir near the well wall. At the same time, the sand flushing fluid pollutes the oil layer, and the recovery time after the well is opened is long; the second is the sand pumping process, which is limited by the well inclination, has low sand pumping efficiency, is not widely used, and is limited to pumping out the mud and sand in the wellbore, and cannot remove the mud and sand in the reservoir near the well wall. If the mud and sand in the reservoir near the well wall cannot be removed, and the high-permeability sand control technology is used, the sand and mud content in the wellbore will be high, and the suspended mud and sand entering the wellbore will sink, causing sand to bury the reservoir or sand to block the well; if the low-permeability sand control technology is used, the mud and sand will block the reservoir or filter layer near the well wall, causing insufficient reservoir fluid supply, resulting in reduced production or shutdown.

[0004] In the Chinese utility model patent application numbered 200920222290.9, a "horizontal well downhole reverse circulation sand flusher" is disclosed, which has a central tube connected to the lower end of the upper joint, a rubber tube core shaft connected to the outer thread at the lower end of the upper joint, a liquid inlet on the wall of the rubber tube core shaft, two V-shaped rubber tubes fixed on the outer wall of the rubber tube core shaft, a nozzle shaft connected to the lower end of the rubber tube core shaft, an annular space formed between the inner wall of the nozzle shaft and the outer wall of the central tube, a liquid outlet on the nozzle shaft wall, a nozzle mounted on the nozzle shaft, and a pressure cap with a conical top connected to the lower end of the nozzle shaft. Although it can perform continuous sand flushing and well washing, and can achieve cyclonic sand flushing, and has the advantages of preventing drill sticking and fast reverse discharge speed, it still cannot overcome the defect of limited sand flushing and mixed discharge carrying capacity for high mud oil wells.

[0005] In the Chinese utility model patent with the application number 201320305008.X, a "sand washing tip" is disclosed, which includes a tubular joint with internal threads provided at the upper and lower ends respectively. An annular boss is provided on the inner wall of the tubular joint. A nozzle disc abuts against the annular boss from the lower side of the annular boss. A tubular pen tip is connected to the lower end of the tubular joint through the internal thread at the lower end of the tubular joint. The upper end of the tubular pen tip abuts against the lower side of the nozzle disc. Three stepped holes with larger upper parts and smaller lower parts are provided on the nozzle disc, and a nozzle is fixedly arranged in each stepped hole. The bottom end of the nozzle protrudes from the bottom surface of the nozzle disc. A copper anti-blocking cap is connected to the bottom end of the nozzle. Although it increases the flow rate of the sand washing fluid, shortens the sand washing time and labor intensity, for high-argillaceous oil wells, obviously the amount of fluid injected into the well is relatively large, which will lead to an extended water cut recovery period and cause damage to the formation, affecting the development effect of horizontal wells.

[0006] In the Chinese invention patent with the application number 201510410641.9, a "continuous negative pressure sand pumping technology string for concentric tubing in horizontal wells" is disclosed. Its high-pressure water faucet is connected to the tool tubing through a reversing joint. The lower end of the tool tubing is connected to a concentric tubing assembly through a conversion joint. The lower end of the concentric tubing assembly is connected to a negative pressure sand pump. A steel ball and a ball seat are arranged inside the reversing joint. The steel ball is connected to a spring, and the other end of the spring is fixed at a position above the ball seat. A drain hole is opened on the wall of the reversing joint below the ball seat, and a sliding sleeve for blocking the drain hole is provided on the outer wall of the reversing joint. Although this string mentions negative pressure sand pumping, it focuses on the integration of functions such as cleaning scale in the casing and breaking cementitious substances, and its pumping and discharging efficiency is limited. Summary of the Invention

[0007] In order to overcome the deficiencies of the existing sand washing and sand pumping technologies, such as weak sand carrying capacity, pollution of the reservoir by the sand washing fluid, large leakage of the fluid injected into the well, long water cut recovery period, low mud and sand pumping and discharging efficiency, and inability to remove the mud and sand in the reservoir near the outside of the wellbore, the utility model provides a sand pumping technology string for high-argillaceous oil wells with strong sand carrying capacity, small amount of fluid injected into the well, high pumping and discharging efficiency, and capable of pumping out the mud and sand in the reservoir.

[0008] The technical solution adopted by the utility model to solve its technical problems is: a sand pumping technology string for high-argillaceous oil wells, which is characterized in that it includes a power mechanism, a liquid collecting mechanism, a wellhead mechanism, a tubing, a casing, a sand pumping pipe mechanism, a sand pumping pump mechanism and a suspension and anchoring mechanism. The tubing passes through the wellhead mechanism, and its upper part is suspended by the power mechanism and connected to the liquid collecting mechanism. The lower part extends into the casing and is connected to the sand pumping pipe mechanism. The sand pumping pipe mechanism includes a traveling valve and a piston pull pipe axially connected from top to bottom. The sand pumping pump mechanism includes a pump barrel, a valve-less piston, a fixed valve and an exhaust and centralizing assembly. The valve-less piston is connected to the lower end of the piston pull pipe and axially slides in the pump barrel. The exhaust and centralizing assembly is arranged at the upper end of the pump barrel. The fixed valve is connected to the lower end of the pump barrel. The suspension and anchoring mechanism supports the fixed valve.

[0009] Preferably, a piston sand groove is provided in an annular manner on the circumferential surface of the valveless piston.

[0010] Preferably, the exhaust righting assembly includes a pump upper coupling, an exhaust screen anchor and a righting pressure cap, the pump upper coupling is arranged at the upper end of the pump barrel, the exhaust screen anchor is ring-shrouded on the piston pull tube, and the lower end thereof is pressed tightly against the pump upper coupling, the righting pressure cap is pressed onto the upper end of the exhaust screen anchor, and is sealed with the piston pull tube, a ventilation cavity is provided between the pump upper coupling and the piston pull tube, and between the exhaust screen anchor and the piston pull tube, and an exhaust through hole is opened on the peripheral surface of the exhaust screen anchor.

[0011] Preferably, the power mechanism includes a wire rope, a hook, a lifting ring and a lifting card, one end of the wire rope is connected to the well-drilling machine through the derrick, and the other end is connected to the hook, and the lifting card is clamped on the upper part of the oil pipe and hung on the hook through the lifting ring.

[0012] Preferably, the liquid collecting mechanism includes an oil pipe plug valve, a faucet, a water hose and a circulation pool, the oil pipe plug valve is connected to the upper end of the oil pipe, the faucet is connected to the oil pipe plug valve, one end of the water hose is connected to the faucet, and the other end is connected to the circulation pool.

[0013] Preferably, the wellhead structure includes a large four-way joint and a blowout preventer, the large four-way joint is connected to the upper end of the casing, and the blowout preventer is arranged at the upper end of the large four-way joint.

[0014] Preferably, the suspension anchoring mechanism includes a pump-down tail pipe, a packer, a sealing tail pipe and a screen pipe, the packer is supported between the sealing tail pipe and the casing, the lower end of the pump-down tail pipe is connected to the upper end of the sealing tail pipe, the upper end is connected to a sand pump mechanism, and the screen pipe is connected to the lower end of the sealing tail pipe.

[0015] Preferably, the sand pumping pipe mechanism also includes a drain device, which is arranged between the oil pipe and the floating valve, and includes a drain body and a copper tube. The upper end of the drain body is connected to the oil pipe, and the lower end is connected to the floating valve. A hollow pin is radially penetrated by a thread on the side wall of the drain body. The closed end of the copper tube is suspended in the drain body, and the open end thereof is connected to the hollow pin.

[0016] Preferably, the suspension anchoring mechanism also includes a backwash well check valve, which includes a well washing screen pipe, a thread plug, and a spring, a valve ball, and a ball seat arranged in the screen pipe. The well washing screen pipe is provided with screen holes on its circumference, one end of which is blocked by a thread plug, and the other end is connected to the inner wall of the tail pipe under the pump and is provided with a pressure cap, which limits the ball seat, one end of the spring is pressed against the thread plug, and the other end presses the valve ball against the ball seat, and the valve ball unidirectionally blocks the well washing through holes arranged on the ball seat and the pressure cap.

[0017] The sand pumping pipe mechanism of the present utility model includes a traveling valve and a piston pull pipe axially connected from top to bottom. The sand pumping pump mechanism includes a pump barrel, a valve-less piston, a fixed valve, and an exhaust and centralizing assembly. Among them, the valve-less piston is connected to the lower end of the piston pull pipe and is axially slidably arranged in the pump barrel. The exhaust and centralizing assembly is arranged at the upper end of the pump barrel, the fixed valve is connected to the lower end of the pump barrel, and the suspension and anchoring mechanism supports the fixed valve. The present utility model pumps well fluid with a high sediment content through the axial sliding of the valve-less piston in the pump barrel. It has a large sediment pumping volume, continuous operation, high pumping and discharging efficiency, and can completely remove the sediment in the reservoir near the well wall. Compared with the existing sand washing and sand pumping technologies, it prevents the sand washing fluid from polluting the oil layer, reduces the input of the sand washing fluid, shortens the water cut recovery period, improves the production efficiency of a single well, extends the validity period by more than 300 days year-on-year, is beneficial to environmental protection, and realizes green and low-carbon production. In addition, during the pumping and discharging process, the sediment content and water cut of the discharged fluid can be sampled and analyzed to provide accurate data for subsequent operations. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the exhaust and centralizing assembly in the present utility model;

[0020] Figure 3 is a schematic structural diagram of the drainer in the present utility model;

[0021] Figure 4 is a schematic structural diagram of the reverse washing well check valve in the present utility model.

[0022] In the figure: 1. Power mechanism, 11. Steel wire rope, 12. Hook, 13. Sling, 14. Elevator, 15. Derrick, 16. Servicing unit, 17. Positioning mark, 2. Liquid collecting mechanism, 21. Tubing cock, 22. Swivel, 23. Hose, 24. Circulation pit, 3. Wellhead mechanism, 31. Large four-way joint, 32. Blowout preventer, 33. Tubing self-sealer, 34. Casing valve, 41. Tubing, 42. Casing, 5. Sand pumping pipe mechanism, 51. Traveling valve, 52. Piston pull pipe, 53. Liquid drainer, 531. Liquid drainer body, 532. Copper pipe, 533. Hollow pin, 6. Sand pumping pump mechanism, 61. Pump barrel, 62. Valve-less piston, 63. Fixed valve, 64. Exhaust and centralizing assembly, 641. Upper pump collar, 642. Exhaust screen anchor, 643. Centralizing compression nut, 644. Ventilation cavity, 645. Exhaust through hole, 646. Piston sand groove, 7. Suspension and anchoring mechanism, 71. Lower pump tail pipe, 72. Packer, 73. Lower tail pipe seal, 74. Screen pipe, 75. Backwashing well check valve, 751. Well washing screen pipe, 752. Plug, 753. Spring, 754. Valve ball, 755. Ball seat, 756. Screen hole, 757. Well washing compression nut, 758. Well washing through hole. Detailed implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1

[0025] As Figure 1 shown, a sand pumping process string for high-argillaceous oil wells includes a power mechanism 1, a liquid collecting mechanism 2, a wellhead mechanism 3, a tubing 41, a casing 42, a sand pumping pipe mechanism 5, a sand pumping pump mechanism 6 and a suspension and anchoring mechanism 7.

[0026] As Figure 1 shown, the tubing 41 passes through the wellhead mechanism 3, its upper part is suspended by the power mechanism 1 and connected to the liquid collecting mechanism 2, and its lower part extends into the casing 42 and is connected to the sand pumping pipe mechanism 5.

[0027] In the present invention, the power mechanism 1 includes a steel wire rope 11, a hook 12, a sling 13 and an elevator 14. As Figure 1As shown, one end of the wire rope 11 is wound around the pulley at the top of the derrick 15 and then connected to the well servicing unit 16, and the other end is connected to the hook 12. The elevating clamp 14 is clamped on the upper part of the tubing 41 and is suspended on the hook 12 through the lifting ring 13. The well servicing unit 16 drives the elevating clamp 14 to drive the tubing 41 to vertically lift and lower by pulling and releasing the wire rope 11 through the hook 12 and the lifting ring 13.

[0028] To facilitate the measurement of the vertical lifting and lowering stroke of the tubing 41, as Figure 1 shown, a positioning mark 17 is provided on the outer peripheral surface of the tubing 41.

[0029] In the present utility model, the liquid collecting mechanism 2 includes a tubing stop valve 21, a swivel 22, a hose 23 and a circulation pool 24. As Figure 1 shown, the tubing stop valve 21 is connected to the upper end of the tubing 41, the swivel 22 is connected to the tubing stop valve 21, one end of the hose 23 is connected to the swivel 22, and the other end is connected to the circulation pool 24. The lifted well fluid is guided by the tubing 41 to the tubing stop valve 21, and then flows into the circulation pool 24 for collection under the control of the swivel 22 through the hose 23.

[0030] In the present utility model, the wellhead mechanism 3 includes a large four-way joint 31 and a blowout preventer 32. As Figure 1 shown, the large four-way joint 31 is connected to the upper end of the casing 42, and the blowout preventer 32 is arranged at the upper end of the large four-way joint 31. To further increase the sealing performance between the tubing 41 and the blowout preventer 32, as Figure 1 shown, a tubing self-sealing device 33 is provided at the upper end of the blowout preventer 32.

[0031] As Figure 1 shown, casing valves 34 are respectively provided on the two horizontal pipe joints of the large four-way joint 31, which can control the communication between the outside and the casing 42 and facilitate the well flushing operation.

[0032] As Figure 1 shown, the sand pumping pipe mechanism 5 includes a traveling valve 51 and a piston pull pipe 52 axially connected from top to bottom. Referring to Figure 1 、 Figure 2 , the sand pumping pump mechanism 6 includes a pump barrel 61, a valve-less piston 62, a fixed valve 63 and an exhaust and centralizing assembly 64. Among them, the valve-less piston 62 is connected to the lower end of the piston pull pipe 52, and it is axially slidably arranged in the pump barrel 61. The exhaust and centralizing assembly 64 is arranged at the upper end of the pump barrel 61, and the fixed valve 63 is connected to the lower end of the pump barrel 61. The suspension and anchoring mechanism 7 supports the fixed valve 63.

[0033] The operation of the sand pumping mechanism 6 takes the upper and lower two strokes as a cycle. When the tubing 41 rises under the action of the power mechanism 1, the sand pumping mechanism 6 enters the upper stroke stage. At this time, the traveling valve 51 closes, and the well fluid above it enters the tubing 41 through the sand pumping pipe mechanism 5 and finally flows into the circulation pool 24. At the same time, the valve-less piston 62 moves upward, the volume of the upper part of the pump barrel 61 becomes smaller, and the well gas in the upper part of the pump barrel 61 is discharged to the casing 42 through the exhaust and centralizing assembly 64. The volume of the lower part of the pump barrel 61 becomes larger, causing the fixed valve 63 to open, and the well fluid at the oil layer is filled into the lower part of the pump barrel 61 through the hanging and anchoring mechanism 7 until the valve-less piston 62 moves upward to the upper end of the pump barrel 61, and the upper stroke ends; when the tubing 41 falls under the action of the power mechanism 1 and its own weight, the sand pumping mechanism 6 enters the lower stroke stage. At this time, the fixed valve 63 closes, the valve-less piston 62 moves downward, the volume of the upper part of the pump barrel 61 becomes larger, and the well gas is filled into the upper part of the pump barrel 61 from the casing 42 through the exhaust and centralizing assembly 64. The volume of the lower part of the pump barrel 61 becomes smaller, causing the traveling valve 51 to open, and the well fluid filled into the pump barrel 61 during the upper stroke stage enters the tubing 41 through the sand pumping pipe mechanism 5 until the valve-less piston 62 moves downward to the lower end of the pump barrel 61, and the lower stroke ends.

[0034] In the present utility model, the exhaust and centralizing assembly 64 includes a pump upper collar 641, an exhaust screen anchor 642, and a centralizing press cap 643. As Figure 2 shown, the pump upper collar 641 is arranged at the upper end of the pump barrel 61, the exhaust screen anchor 642 is sleeved around the piston pull rod 52, its lower end presses tightly against the pump upper collar 641, and the centralizing press cap 643 is pressed on the upper end of the exhaust screen anchor 642 and is in sealing cooperation with the piston pull rod 52. An air vent cavity 644 is provided between the pump upper collar 641 and the piston pull rod 52, and between the exhaust screen anchor 642 and the piston pull rod 52. Exhaust through holes 645 are formed on the circumferential surface of the exhaust screen anchor 642. The upper part of the pump barrel 61 is communicated with the casing 42 through the air vent cavity 644 and the exhaust through holes 645.

[0035] To prevent the mud and sand in the well fluid in the casing 42 from entering the gap between the valve-less piston 62 and the pump barrel 61 and causing sand jamming of the valve-less piston 62, as Figure 2 shown, a piston sand groove 646 is annularly provided on the circumferential surface of the valve-less piston 62.

[0036] As Figure 1 shown, in the present utility model, the hanging and anchoring mechanism 7 includes a pump lower tail pipe 71, a packer 72, a lower tail pipe seal 73, and a screen pipe 74. Among them, the packer 72 is supported between the lower tail pipe seal 73 and the casing 42. The lower end of the pump lower tail pipe 71 is connected to the upper end of the lower tail pipe seal 73, its upper end is connected to the fixed valve 63 of the sand pumping mechanism 6, and the screen pipe 74 is connected to the lower end of the lower tail pipe seal 73.

[0037] Embodiment 2

[0038] In this embodiment, the sand pumping pipe mechanism 5 further includes a liquid drainer 53.

[0039] As Figure 1 , Figure 3 shown, the liquid drainer 53 is arranged between the tubing 41 and the traveling valve 51, and it includes a liquid drain body 531 and a copper tube 532. Among them, the upper end of the liquid drain body 531 is connected to the tubing 41, and the lower end is connected to the traveling valve 51. A hollow pin 533 is radially penetrated through the side wall of the liquid drain body 531 by threads. The closed end of the copper tube 532 is suspended in the liquid drain body 531, and its open end is welded to the hollow pin 533.

[0040] After the pumping and draining are completed, first remove the wellhead mechanism 3, drop an impact rod into the tubing 41. The impact rod falls to the liquid drainer 53 and breaks the copper tube 532. After the well fluid in the tubing 41 leaks out through the open end of the copper tube 532 and the hollow pin 533, then lift the tubing 41 to release the packer 72 and pull out all the pumping and draining pipe strings.

[0041] Embodiment 3

[0042] In this embodiment, the hanging and anchoring mechanism 7 further includes a backwashing check valve 75.

[0043] As Figure 1 , Figure 4 shown, the backwashing check valve 75 includes a washing screen pipe 751, a plug 752, and a spring 753, a valve ball 754, and a ball seat 755 arranged in the washing screen pipe 751. Among them, the circumferential surface of the washing screen pipe 751 is provided with screen holes 756. One end of it is blocked by the plug 752, and the other end is connected to the inner side wall of the tail pipe 71 under the pump and is provided with a washing pressure cap 757. The washing pressure cap 757 limits the position of the ball seat 755. One end of the spring 753 abuts against the plug 752, and the other end presses the valve ball 754 against the ball seat 755. The valve ball 754 unidirectionally blocks the washing through holes 758 provided on the ball seat 755 and the washing pressure cap 757.

[0044] During the pumping and draining process, if it is found that the sand pumping pipe mechanism 5 and the sand pumping pump mechanism 6 are blocked by mud and sand, then take backwashing measures. During backwashing, use a cement pump truck to pump the washing fluid out of the circulation pool 24, inject it into the casing 42 through the casing valve 34. The washing fluid pushes open the valve ball 754, enters the washing screen pipe 751 through the washing through hole 758, and then enters the tail pipe 71 under the pump through the screen holes 756, and finally flows into the circulation pool 24 through the liquid collecting mechanism 2 to discharge the blocked mud and sand.

[0045] Although all of the above embodiments use Figures 1 to 4, but as will be clearly understood by those skilled in the art, there is no need to provide separate drawings to represent them. As long as the missing components or structural features in the embodiments are removed from the drawings. This is clear to those skilled in the art. Of course, the embodiment with more components is just the optimal embodiment, and the embodiment with fewer components is the basic embodiment, but it can also achieve the basic invention purpose. Therefore, all these variant embodiments are within the protection scope of the present utility model.

[0046] In this application, the components themselves that are not elaborated and the connection manners of the various components in this application all belong to the well-known technologies in this technical field and will not be elaborated further. For example, welding, screw-thread connection, etc.

[0047] In the present utility model, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0048] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0049] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0050] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-mud oil well pumping process string, characterized in that: It includes a power mechanism, a liquid collecting mechanism, a wellhead mechanism, an oil pipe, a casing, a sand pumping mechanism, a sand pumping mechanism and a suspension anchoring mechanism. The oil pipe passes through the wellhead mechanism, and its upper part is suspended by the power mechanism and connected to the liquid collecting mechanism, and its lower part extends into the casing and connected to the sand pumping mechanism. The sand pumping mechanism includes a floating valve and a piston pull tube axially connected from top to bottom. The sand pump mechanism includes a pump barrel, a valveless piston, a fixed valve and an exhaust straightening assembly. The valveless piston is connected to the lower end of the piston pull tube and is axially slidably arranged in the pump barrel. The exhaust straightening assembly is arranged at the upper end of the pump barrel, the fixed valve is connected to the lower end of the pump barrel, and the suspension anchoring mechanism supports the fixed valve.

2. A high-mud oil well pumping process string according to claim 1, characterized in that: A piston sand groove is provided in an annular manner on the circumferential surface of the valveless piston.

3. A high-mud oil well pumping process string according to claim 1, characterized in that: The exhaust righting assembly includes a pump upper coupling, an exhaust screen anchor and a righting pressure cap. The pump upper coupling is arranged at the upper end of the pump barrel. The exhaust screen anchor is sleeved on the piston pull tube, and its lower end presses the pump upper coupling. The righting pressure cap is pressed on the upper end of the exhaust screen anchor, and is sealed with the piston pull tube. A ventilation cavity is provided between the pump upper coupling and the piston pull tube, and between the exhaust screen anchor and the piston pull tube, and an exhaust through hole is opened on the peripheral surface of the exhaust screen anchor.

4. The high-mud oil well pumping process string according to claim 1, characterized in that: The power mechanism comprises a steel wire rope, a hook, a lifting ring and a lifting card. One end of the steel wire rope is connected to the well-drilling machine through the derrick, and the other end is connected to the lifting hook. The lifting card is clamped on the upper part of the oil pipe and hung on the hook through the lifting ring.

5. The high-mud oil well pumping process string according to claim 1, characterized in that: The liquid collecting mechanism comprises an oil pipe cock, a faucet, a water hose and a circulation pool. The oil pipe cock is connected to the upper end of the oil pipe, the faucet is connected to the oil pipe cock, one end of the water hose is connected to the faucet, and the other end is connected to the circulation pool.

6. The high-mud oil well pumping process string according to claim 1, characterized in that: The wellhead mechanism comprises a large four-way connection and a blowout preventer. The large four-way connection is connected to the upper end of the casing, and the blowout preventer is arranged at the upper end of the large four-way connection.

7. The high-mud oil well pumping process string according to claim 1, characterized in that: The suspension anchoring mechanism comprises a pump tail pipe, a packer, a sealing tail pipe and a screen pipe. The packer is supported between the sealing tail pipe and the casing. The lower end of the pump tail pipe is connected to the upper end of the sealing tail pipe, and the upper end is connected to a sand pump mechanism. The screen pipe is connected to the lower end of the sealing tail pipe.

8. The high-mud oil well pumping process string according to claim 1, characterized in that: The sand pumping pipe mechanism also includes a drain, which is arranged between the oil pipe and the floating valve, and includes a drain body and a copper tube. The upper end of the drain body is connected to the oil pipe, and the lower end is connected to the floating valve. A hollow pin is radially penetrated by a thread on the side wall of the drain body. The closed end of the copper tube is suspended in the drain body, and the open end thereof is butt-jointed with the hollow pin.

9. A high-mud oil well pumping process string according to claim 7, characterized in that: The suspension anchoring mechanism also includes a backwash well check valve, which includes a well washing screen pipe, a thread plug, and a spring, a valve ball, and a ball seat arranged in the screen pipe. The well washing screen pipe is provided with screen holes on its circumference, one end of which is blocked by a thread plug, and the other end is connected to the inner side wall of the tail pipe under the pump and is provided with a pressure cap. The pressure cap limits the ball seat, one end of the spring is pressed against the thread plug, and the other end presses the valve ball against the ball seat, and the valve ball unidirectionally blocks the well washing through holes arranged on the ball seat and the pressure cap.

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