Oil-water well sand bailing device

Abstract

The utility model discloses an oil-water well sand bailing device which comprises a plunger assembly and a pump cylinder assembly, a broken sand storage device is arranged at the lower end of the pump cylinder assembly, and the plunger assembly is inserted into the pump cylinder assembly from the upper end of the pump cylinder assembly; the plunger assembly and the pump cylinder assembly are provided with a radial suction device and a bypass suction device. According to the sand bailing device, liquid suction and liquid drainage processes exist in the ascending and descending processes of an oil pipe, it is guaranteed that fluid in a well forms continuous flow, continuous sand bailing is achieved, the sand bailing operation efficiency is high, and the problem that according to a conventional sand bailing process, liquid can only be drained in a half way, sand deposits, and a bottom valve is prone to being blocked is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field machinery, and particularly relates to a sand fishing device for oil and water wells. Background Art

[0002] After sand production in oil and water wells, currently, two methods, hydraulic sand washing and sand fishing, are generally used on site to remove the accumulated sand in the well. Among them, the hydraulic sand washing method has good effect when the formation pressure is high. When applied in low-pressure wells and lost circulation wells, since the liquid column pressure of the sand washing fluid is much greater than the formation static pressure, a large amount of the sand washing fluid will leak into the formation, and the suspended sand will also re-enter the formation with the lost fluid, which not only pollutes the formation, affects the production, but also increases the subsequent operation cost. The sand fishing process can avoid formation damage and has low construction cost, but it can only drain and pump sand during the upward stroke of the pipe string. During the downward stroke, the sand liquid in the pipe string is in a static state, resulting in low sand fishing efficiency, and the sand particles are prone to deposit and block the pump.

[0003] Publication (Announcement) No.: CN201301676Y discloses a sand fishing pump for oil and water wells, which is designed with a liquid outlet valve, a retaining joint, a piston connecting pipe, and a pump barrel. There is a key block on the piston connecting pipe, and the key block is in the key groove of the retaining joint. The shunt joint is provided with a discharge channel and a vertical channel. Under the action of the key block, the pump barrel can be driven to rotate. When there are sundries in the well, the tubing can be rotated to drill the sundries to eliminate the influence of the sundries on sand fishing. Since a discharge valve is designed, when the sand cannot be fished out, the liquid flow sand washing method can be used to remove and identify the bottom accumulated sand to avoid unsuccessful sand fishing.

[0004] This prior art can only drain and pump sand during the upward stroke. During the downward stroke, the sand liquid in the pipe string is in a static state, and the sand particles deposit and block the fixed valve, making it impossible to continue pumping sand.

[0005] Publication (Announcement) No.: CN106437584B discloses a negative pressure continuous sand fishing device, which can continuously suck and discharge liquid in one stroke of the piston, realizing continuous sand fishing and improving the sand fishing efficiency.

[0006] This prior art has a complex structure, and the sand storage cavity is located above the piston pump barrel and below the water outlet hole. During operation, the plunger with a liquid outlet hole will reciprocate up and down through the sand storage cavity. Once a large amount of sand is fished, it is extremely easy to cause sand jamming and sand burying of the plunger.

[0007] Publication (Announcement) Number: CN106677727A discloses a continuous negative pressure sand washing device and its system. By inputting sand washing fluid from the liquid injection port of the casing, it flows into the closed liquid injection cavity formed between the liner pipe and the sand washing pipe and the casing, and is input into the jet pump; the sand washing fluid is ejected from the nozzle of the jet pump at a high speed and enters the inner cavity of the sand washing pipe. At this time, negative pressure is formed at the lower part of the inner cavity of the sand washing pipe. Under the action of the negative pressure, the sand grains at the bottom of the well or the liquid with sand grains are sucked into the inner cavity of the sand washing pipe from the sand washing holes of the sand washing head; then the sand grains at the bottom of the well or the liquid with sand grains are mixed with the sand washing fluid, flow out of the inner cavity of the sand washing pipe through the diversion holes of the sand washing pipe, and flow into the closed liquid outlet cavity formed between the liner pipe and the sand washing pipe, and are output to the wellhead through the liquid outlet of the liner pipe.

[0008] The sand fishing channel of this prior art has a drastic change in aperture at the jet pump. Once a large amount of sand is fished, it is very easy to cause sand jamming at the jet pump.

[0009] In short, the technical solutions, the technical problems to be solved, and the beneficial effects of the above disclosed technologies are all different from those of the present utility model. For more technical features, technical problems to be solved, and beneficial effects of the present utility model, there is no technical inspiration in the above disclosed technical documents. Content of the Utility Model

[0010] In view of the above-mentioned defects existing in the prior art, the purpose of the present utility model is to provide a sand fishing device for oil and water wells, which not only realizes continuous sand fishing during the up and down strokes of the tubing, but also has a simple structure. The sand settling cavity is located below the pumping string and is not easily sand jammed by the plunger.

[0011] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0012] A sand fishing device for oil and water wells includes a plunger assembly and a pump barrel assembly. A sand crushing and sand storage device is arranged at the lower end of the pump barrel assembly, and the plunger assembly is inserted into the pump barrel assembly from the upper end of the pump barrel assembly; a radial suction device and a bypass suction device are arranged between the plunger assembly and the pump barrel assembly.

[0013] Further, the radial suction device includes a large pump liquid outlet valve and a large pump liquid inlet valve;

[0014] Specifically, the bypass suction device includes a plunger bypass mechanism, a pump barrel bypass mechanism, and a liquid passing hole;

[0015] Specifically, the plunger assembly includes a small plunger and a large plunger. The small plunger and the large plunger are connected and communicated through a plunger bypass mechanism. The large plunger is arranged below the small plunger, and the large pump liquid outlet valve is arranged at the lower end of the large plunger;

[0016] Specifically, the pump barrel assembly includes an outer barrel, a large pump barrel, and a small pump barrel. The large pump barrel is disposed inside the outer barrel. The upper end of the large pump barrel is connected to the upper end of the outer barrel. The lower end of the small pump barrel is connected to the upper end of the outer barrel. The large pump inlet valve is disposed at the lower end of the large pump barrel.

[0017] Specifically, a pump barrel annulus is formed between the large pump barrel and the outer barrel. A pump barrel bypass mechanism is disposed at the lower end of the pump barrel annulus. The liquid passing hole is disposed at the upper end of the large pump barrel. The liquid passing hole communicates the upper annular sealing cavity between the small plunger and the large pump barrel with the pump barrel annulus.

[0018] Further, the plunger bypass mechanism includes a liquid outlet valve seat joint.

[0019] Specifically, the upper end of the liquid outlet valve seat joint is connected to the small plunger, and the lower end is connected to the large plunger.

[0020] Specifically, the liquid outlet valve seat joint is provided with a radial through hole and a liquid outlet channel.

[0021] Specifically, the radial through hole communicates the small plunger with the large plunger. The outer diameter of the liquid outlet valve seat joint is smaller than that of the large pump barrel. The liquid outlet channel communicates the outside and the inside of the liquid outlet valve seat joint.

[0022] Specifically, a small pump liquid outlet valve is disposed on the liquid outlet channel.

[0023] Further, the pump barrel bypass mechanism includes a liquid inlet valve seat joint.

[0024] Specifically, the liquid inlet valve seat joint is disposed at the lower end of the pump barrel annulus and is connected to the lower end of the large pump barrel and the inner wall of the outer barrel. One or at least two small pump inlet valves are disposed on the liquid inlet valve seat joint.

[0025] Further, the small plunger is sealed in cooperation with the small pump barrel or is provided with a sealing ring for sealing. The large plunger is sealed in cooperation with the large pump barrel or is provided with a sealing ring for sealing.

[0026] Further, the sand crushing and sand storage device includes a sand settling pipe and a sand fishing cone tip.

[0027] Specifically, the upper end of the sand settling pipe is connected to the outer barrel, the lower end of the sand settling pipe is connected to the sand fishing cone tip. A filter screen is disposed inside the sand settling pipe. A sand inlet valve is disposed below the filter screen inside the sand settling pipe.

[0028] Further, the connections between the outer barrel and the small pump barrel, the large pump barrel, and the liquid inlet valve seat joint are all thread connections and are hermetically sealed by screwing.

[0029] Specifically, the connection between the liquid inlet valve seat joint and the large pump barrel is a thread connection and is hermetically sealed by screwing.

[0030] Further, the connections between the liquid outlet valve seat joint and the small plunger and the large plunger are both threaded connections and are hermetically sealed by screwing.

[0031] Further, the connection between the sand settling pipe and the outer cylinder is a threaded connection and is hermetically sealed by screwing; the connection between the sand settling pipe and the sand fishing taper tip is a threaded connection or a welded connection, and the connection between the sand settling pipe and the filter screen is a detachable connection.

[0032] Further, the upper end of the small plunger is connected with a liquid outlet joint, the liquid outlet joint is provided with one or at least two liquid outlet holes, and the upper end of the liquid outlet joint is connected with a power tubing.

[0033] The utility model has the following beneficial effects compared with the prior art:

[0034] 1. During the up and down movement of the tubing in the utility model, there are both liquid suction and drainage processes, which ensure the formation of a continuous flow of well fluid, realize continuous sand fishing, and have high sand fishing operation efficiency. It solves the problem that the conventional sand fishing process can only drain liquid halfway and the sand deposition is easy to block the bottom valve.

[0035] 2. The sand settling chamber of the utility model is located at the lower part of the pipe string, and the sand-carrying well fluid enters the pump barrel after being filtered by the filter screen, which can avoid sand jamming the plunger and extend the service life of the pipe string.

[0036] 3. The utility model combines the advantages of hydraulic sand washing and sand fishing and eliminates the disadvantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of a sand fishing device for oil and water wells of the utility model.

[0038] In the figure: liquid outlet joint 1, small pump barrel 2, outer cylinder 3, small plunger 4, large pump barrel 5, liquid outlet valve seat joint 6, small pump liquid outlet valve 7, large plunger 8, large pump liquid outlet valve 9, large pump liquid inlet valve 10, liquid inlet valve seat joint 11, small pump liquid inlet valve 12, filter screen 13, sand settling pipe 14, sand inlet valve 15, sand fishing taper tip 16. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without creative efforts shall fall within the protection scope of the utility model.

[0040] Embodiment 1:

[0041] Please refer to Figure 1, a sand fishing device for oil and water wells provided by the utility model includes a plunger assembly and a pump barrel assembly. A broken sand and sand storage device is arranged at the lower end of the pump barrel assembly. The plunger assembly is inserted into the pump barrel assembly from the upper end of the pump barrel assembly. A radial suction device and a bypass suction device are arranged between the plunger assembly and the pump barrel assembly.

[0042] Furthermore, the radial suction device includes a large pump liquid outlet valve 9 and a large pump liquid inlet valve 10; the bypass suction device includes a plunger bypass mechanism, a pump barrel bypass mechanism, and a liquid passing hole.

[0043] The plunger assembly includes a small plunger 4 and a large plunger 8. The small plunger 4 and the large plunger 8 are connected and communicated through a plunger bypass mechanism. The large plunger 8 is arranged below the small plunger 4. The large pump liquid outlet valve 9 is arranged at the lower end of the large plunger 8.

[0044] The pump barrel assembly includes an outer barrel 3, a large pump barrel 5, and a small pump barrel 2. The large pump barrel 5 is arranged inside the outer barrel 3. The upper end of the large pump barrel 5 is connected to the upper end of the outer barrel 3. The lower end of the small pump barrel 2 is connected to the upper end of the outer barrel 3. The large pump liquid inlet valve 10 is arranged at the lower end of the large pump barrel 5. A pump barrel annulus is formed between the large pump barrel 5 and the outer barrel 3. A pump barrel bypass mechanism is arranged at the lower end of the pump barrel annulus. The liquid passing hole is arranged at the upper end of the large pump barrel 5. The liquid passing hole communicates the upper annular sealing cavity B between the small plunger 4 and the large pump barrel 5 with the pump barrel annulus.

[0045] Furthermore, the plunger bypass mechanism includes a liquid outlet valve seat joint 6. The upper end of the liquid outlet valve seat joint 6 is connected to the small plunger 4, and the lower end is connected to the large plunger 8. The liquid outlet valve seat joint 6 is provided with a radial through hole and a liquid outlet channel. The radial through hole communicates the small plunger 4 and the large plunger 8. The outer diameter of the liquid outlet valve seat joint 6 is smaller than that of the large pump barrel 5. The liquid outlet channel communicates the outside and the inside of the liquid outlet valve seat joint 6. A small pump liquid outlet valve 7 is arranged on the liquid outlet channel.

[0046] Furthermore, the pump barrel bypass mechanism includes a liquid inlet valve seat joint 11. The liquid inlet valve seat joint 11 is arranged at the lower end of the pump barrel annulus and is connected to the lower end of the large pump barrel 5 and the inner wall of the outer barrel 3. One or at least two small pump liquid inlet valves 12 are arranged on the liquid inlet valve seat joint 11.

[0047] Preferably, the small plunger 4 and the small pump barrel 2 are sealed by fitting or provided with a sealing ring for sealing. The large plunger 8 and the large pump barrel 5 are sealed by fitting or provided with a sealing ring for sealing.

[0048] Furthermore, the broken sand and sand storage device includes a sand settling pipe 14 and a sand fishing cone tip 16. The upper end of the sand settling pipe 14 is connected to the outer barrel 3. The lower end of the sand settling pipe 14 is connected to the sand fishing cone tip 16. A filter screen 13 is arranged inside the sand settling pipe 14. A sand inlet valve 15 is arranged below the filter screen 13 inside the sand settling pipe 14.

[0049] Further, a liquid outlet connector 1 is connected to the upper end of the small plunger 4. The liquid outlet connector 1 is provided with one or at least two liquid outlet holes, and the upper end of the liquid outlet connector 1 is connected to a power oil pipe.

[0050] Preferably, the connections between the outer cylinder 3 and the small pump cylinder 2, the large pump cylinder 5, the liquid inlet valve seat connector 11, and the sand settling pipe 14 are all threaded connections and are hermetically sealed by screwing.

[0051] Preferably, the connections between the liquid outlet valve seat connector 6 and the small plunger 4 and the large plunger 8 are all threaded connections and are hermetically sealed by screwing.

[0052] Preferably, the connection between the liquid inlet valve seat connector 11 and the large pump cylinder 5 is a threaded connection and is hermetically sealed by screwing.

[0053] Preferably, the connection between the sand settling pipe 14 and the sand fishing cone tip 16 is a threaded connection or a welded connection, and the connection between the sand settling pipe 14 and the filter screen 13 is a detachable connection, such as a threaded connection.

[0054] It should be noted that the setting method of the one-way valves (the small pump liquid outlet valve 7, the large pump liquid outlet valve 9, the large pump liquid inlet valve 10, the small pump liquid inlet valve 12, and the sand inlet valve 15) is a prior art, and those skilled in the art are clear about this, so it will not be elaborated here.

[0055] Embodiment 2:

[0056] On the basis of Embodiment 1, this embodiment provides a working process of the sand fishing device for oil and water wells.

[0057] The large pump cylinder 5 and the large plunger 8 form a lower sealing cavity A;

[0058] The small plunger 4 and the large pump cylinder 5 form an upper annular sealing cavity B;

[0059] The sand settling pipe 14, the sand inlet valve 15, and the filter screen 13 form a sand settling cavity C;

[0060] The large pump cylinder 5 and the outer cylinder 3 form a pump cylinder annulus.

[0061] The working process of the present utility model is as follows:

[0062] S1. After the sand fishing device for oil and water wells is connected, it is lowered into the well by a tubing to the sand surface.

[0063] S2. When the tubing moves upward, it drives the small plunger 4 and the large plunger 8 to move upward. The volume of the lower sealing cavity A increases and the pressure decreases. The large pump liquid inlet valve 10 is opened under the action of the pressure difference. The sand-mixed liquid in the well enters the lower sealing cavity A through the sand inlet valve 15, the sand settling pipe 14, and the filter screen 13;

[0064] Meanwhile, the volume of the upper annular chamber B decreases, and the pressure increases. The inlet valve 12 of the small pump closes, and the outlet valve 7 of the small pump opens. The fluid in the upper annular sealing chamber B enters the small plunger 4 and enters the annulus space of the tubing string through the outlet hole of the outlet connector 1.

[0065] S3. When the tubing string descends, the volume of the lower sealing chamber A decreases, and the pressure increases, causing the inlet valve 10 of the large pump to close and the outlet valve 9 of the large pump to open. The fluid ascends through the inner cavity of the small plunger 4 at the upper end of the large plunger 8 and enters the annulus space of the tubing string through the outlet hole of the outlet connector 1.

[0066] Meanwhile, the volume of the upper annular chamber B increases, and the pressure decreases, causing the inlet valve 12 of the small pump to open and the outlet valve 7 of the small pump to close. The fluid enters the upper annular sealing chamber B from the annulus of the pump barrel through the liquid hole, and the upper annular sealing chamber B completes the liquid inlet process.

[0067] S4. Due to the blockage of the filter screen 13, the sand in the sand-mixed liquid will eventually remain in the sand settling pipe 14. As the sand surface in the wellbore drops, the sand fishing device will continue to descend under the action of gravity. Through the reciprocating movement of the large and small plungers (8, 4), the sand fishing string continuously deepens until the bottom of the well is fished or the sand fishing device no longer descends. Then the sand fishing device is lifted out of the wellbore, and the sand settled in the sand settling pipe 14 is brought to the ground, and the entire sand fishing process ends.

[0068] This device keeps the suction process uninterrupted, enables the broken sand to be continuously impacted by the liquid flow, improves the sand fishing efficiency, and solves the problem that the conventional sand fishing process can only drain liquid halfway and the sand deposition is easy to block the bottom valve.

[0069] In this application, all components that are not elaborated and the connection methods of each component in this application belong to the well-known technologies in the technical field. They can be directly applied and will not be elaborated further.

[0070] In the present utility model, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected", "fixed", etc. 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.

[0071] 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. It 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.

[0072] 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 instance. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0073] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various changes and modifications. Any modifications, equivalent replacements, improvements, 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 sand bailing device for oil and water wells, comprising a plunger assembly and a pump barrel assembly, wherein a crushed sand storage device is provided at the lower end of the pump barrel assembly, and the plunger assembly is inserted into the pump barrel assembly from the upper end of the pump barrel assembly; It is characterized in that The plunger assembly and the pump barrel assembly are provided with a radial suction device and a bypass suction device.

2. The sand bailing device for oil and water wells according to claim 1, characterized in that: The radial suction device includes a large pump liquid outlet valve and a large pump liquid inlet valve; The bypass suction device includes a plunger bypass mechanism, a pump barrel bypass mechanism, and a liquid hole; The plunger assembly includes a small plunger and a large plunger, the small plunger and the large plunger are connected and communicated through a plunger bypass mechanism, the large plunger is arranged below the small plunger, and the large pump liquid outlet valve is arranged at the lower end of the large plunger; The pump barrel assembly includes an outer barrel, a large pump barrel and a small pump barrel. The large pump barrel is arranged in the outer barrel. The upper end of the large pump barrel is connected to the upper end of the outer barrel. The lower end of the small pump barrel is connected to the upper end of the outer barrel. The large pump inlet valve is arranged at the lower end of the large pump barrel. A pump barrel annulus is formed between the large pump barrel and the outer barrel, a pump barrel bypass mechanism is arranged at the lower end of the pump barrel annulus, and the liquid hole is arranged at the upper end of the large pump barrel. The liquid hole connects the upper annular sealing cavity between the small plunger and the large pump barrel with the pump barrel annulus.

3. The sand bailing device for oil and water wells according to claim 2, characterized in that: The plunger bypass mechanism includes a liquid outlet valve seat joint; The upper end of the liquid outlet valve seat joint is connected to the small plunger, and the lower end is connected to the large plunger; The liquid outlet valve seat joint is provided with a radial through hole and a liquid outlet channel; The radial through hole connects the small plunger with the large plunger, the outer diameter of the liquid outlet valve seat joint is smaller than the large pump barrel, and the liquid outlet channel connects the outside and the inside of the liquid outlet valve seat joint; The liquid outlet channel is provided with a small pump liquid outlet valve.

4. The sand bailing device for oil and water wells according to claim 2, characterized in that: The pump barrel bypass mechanism includes a liquid inlet valve seat joint; The inlet valve seat joint is arranged at the lower end of the pump barrel annulus, connected with the lower end of the large pump barrel and the inner wall of the outer barrel, and one or at least two small pump inlet valves are arranged on the inlet valve seat joint.

5. The sand bailing device for oil and water wells according to claim 2, characterized in that: The small plunger cooperates with the small pump barrel for sealing or is provided with a sealing ring for sealing, and the large plunger cooperates with the large pump barrel for sealing or is provided with a sealing ring for sealing.

6. The sand bailing device for oil and water wells according to claim 2, characterized in that: The crushed sand storage device comprises a sand settling pipe and a sand bailing cone tip; The upper end of the sand settling pipe is connected to the outer cylinder, the lower end of the sand settling pipe is connected to the tip of the sand scooping cone, a filter screen is arranged in the sand settling pipe, and a sand inlet valve is arranged below the filter screen in the sand settling pipe.

7. The sand bailing device for oil and water wells according to claim 4, characterized in that: The connections between the outer cylinder and the small pump cylinder, the large pump cylinder, and the inlet valve seat joint are all threaded connections, and the threads are screwed together and sealed; The connection between the liquid inlet valve seat joint and the large pump barrel is a threaded connection, and is sealed by screwing through the threaded connection.

8. The sand bailing device for oil and water wells according to claim 3, characterized in that: The connection between the liquid outlet valve seat joint and the small plunger and the large plunger is a threaded connection, and the threaded connection is screwed and sealed.

9. The sand bailing device for oil and water wells according to claim 6, characterized in that: The connection between the sand settling pipe and the outer cylinder is a threaded connection, and is sealed by screwing through the threaded connection; the connection between the sand settling pipe and the sand bailing cone tip is a threaded connection or welding; the connection between the sand settling pipe and the filter is a detachable connection.

10. An oil-water well sand bailing device according to any one of claims 2 to 9, characterized in that: The upper end of the small plunger is connected to a liquid outlet joint, the liquid outlet joint is provided with one or at least two liquid outlet holes, and the upper end of the liquid outlet joint is connected to the power oil pipe.

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