A pump for reducing viscosity of a drilling fluid and a pipe string

Abstract

The utility model discloses a kind of over-pump viscosity-reducing drilling fluid pump and oil production pipe column, including upper pump cylinder, lower cylinder, the liquid flow passage is arranged in the lower cylinder, dosing passage;Plunger body is arranged in the upper pump cylinder, medicament passage is arranged in the plunger body;Upper pump cylinder lower end is connected with lower cylinder upper end, the upper pump cylinder is communicated with liquid flow passage, medicament passage lower end is communicated with dosing passage by length self-adapting pipe. The plunger body of the utility model is additionally provided with medicament passage injection medicament, solve the problem of conventional hollow dosing pump pump valve failure fast, greatly improve the life and reliability of valve group.

Description

Technical Field

[0001] This utility model relates to the field of oil production equipment technology, specifically a viscosity-reducing lift pump and an oil production tubing string. Background Technology

[0002] CCUS production wells mostly employ pumping unit lift. After extraction, the crude oil has high viscosity, leading to problems such as slow rod descent, rod string buckling, and tubing wear. To mitigate rod wear and improve lift efficiency, some heavy oil reservoirs currently utilize viscosity-reducing lift. The main methods include on-pump water viscosity reduction, on-pump and off-pump electric heating viscosity reduction, annular chemical viscosity reduction, and off-pump swirl viscosity reduction. These methods effectively improve chemical efficacy and solve problems such as casing damage caused by chemical adhesion to the annular walls. Among these, off-pump swirl viscosity reduction technology has excellent effects in reducing chemical dosage. However, its application suffers from a short lift pump life, hindering the widespread adoption of this technology.

[0003] Announcement No. CN216974800U discloses a heating device for the inlet of a heavy oil well pump. The water inlet pipe of the surface heating device is connected to the inlet of the screen pipe via the water inlet valve of the wellhead tubing and the pump. The outlet of the screen pipe is connected to the return water pipe. The return water pipe is connected to the return water valve along the pump and tubing to the wellhead. The return water pipe is connected to the surface heating device via the return water pipe.

[0004] The existing technology of temperature heating to reduce viscosity is different from this patent.

[0005] Announcement No. CN222615606U discloses a wireless downhole fluid level monitoring screw pump, including a tubing string, a stator and a rotor for cooperative use inside the tubing string, a hollow sucker rod on the upper part of the rotor, tubing on the upper part of the stator, a fluid outlet tee on the top surface of the tubing string, a surface drive device above the wellhead, a universal joint on the top of the polished rod of the hollow sucker rod, a hollow rotor, a built-in storage pressure gauge inside the rotor, a lifting assembly above the built-in storage pressure gauge, and a limit device at the bottom of the rotor.

[0006] The existing technology is a screw pump dosing solution and cannot be adapted to a lift pump.

[0007] Publication No. CN105089561A discloses a fixed-displacement pump-assisted chemical lifting process. The process involves injecting the required chemical into the storage tank of a multi-functional chemical dripping device, turning on the metering pump, and adjusting the dripping rate according to a pre-optimized dosage. After being pressurized by the metering pump, the chemical passes through a high-pressure hose, an injection tee, a single-flow hollow sucker rod string, a plunger, and a vortex mixer, finally entering the tubing from the release device of the vortex mixer. Driven by the plunger, the vortex mixer moves up and down. The main vane rotates due to the impact of the fluid flow, driving the secondary vane to rotate. The secondary vane stirs the well fluid, ensuring thorough mixing of the chemical and the well fluid. Finally, the mixture is pumped to the surface via the annulus of the rod and tubing.

[0008] In this existing technology, the lifting section includes the entire downhole chemical dosing section, which increases the energy consumption of oil production.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a pump for reducing viscosity and lifting fluid and an oil production tubing string.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] On one hand, this utility model provides a viscosity-reducing pump for liquid lifting, including an upper pump cylinder and a lower cylinder. The lower cylinder is provided with a liquid flow channel and a dosing channel. The upper pump cylinder is provided with a plunger body, and a drug channel passes through the plunger body. The lower end of the upper pump cylinder is connected to the upper end of the lower cylinder. The upper pump cylinder is connected to the liquid flow channel. The lower end of the drug channel is connected to the dosing channel through a length adaptive tube.

[0013] Furthermore, a baffle is provided at the upper end of the inner wall of the lower cylinder, and the baffle is provided with liquid passage holes and medicine passage holes;

[0014] Specifically, the lower end face of the baffle is connected to the bottom inlet valve at the liquid passage hole, the liquid inlet valve is a liquid flow channel, the lower end face of the baffle is connected to the dosing pipe at the drug passage hole, the dosing pipe is connected to the dispensing valve, the dosing pipe is a dosing channel, and the length adaptive pipe is connected to the dosing pipe.

[0015] Furthermore, the baffle includes a side plate portion and a horizontal plate portion, the side plate portion being provided with a liquid passage hole and the horizontal plate portion being provided with a medicine passage hole.

[0016] Furthermore, the lower end of the dosing tube is connected to a drug extension tube, and a drug outlet valve is provided inside the drug extension tube. A threaded connecting ring is provided at the lower end of the length adaptive tube, and the threaded connecting ring is threadedly connected to the dosing tube inside the dosing tube, so that the length adaptive tube can be retracted into the dosing tube.

[0017] Furthermore, the length-adaptive tube is a spring tube.

[0018] Furthermore, a hydrocyclone is provided on the inner wall of the lower cylinder, and the lower port of the extended drug tube is located below the hydrocyclone.

[0019] Furthermore, an upper connector is provided at the upper end of the plunger body, an upper end cap is provided inside the upper connector, a lower end cap is provided at the lower end of the plunger body, and a drug passage tube is inserted inside the upper end cap and the lower end cap, with the drug passage tube serving as a drug channel;

[0020] Specifically, the upper end of the plunger body is provided with a liquid outlet hole on the outside of the upper connector, the lower end of the plunger body is provided with a liquid inlet hole on the outside of the lower connector, the liquid outlet valve is connected to the liquid outlet hole inside the plunger body, and the liquid inlet valve is connected to the liquid inlet hole inside the plunger body.

[0021] Furthermore, the plunger body includes an upper conical shell, a middle straight shell, and a lower conical shell connected from top to bottom;

[0022] Specifically, the upper conical shell is connected to an upper connector at its upper end and has a liquid outlet hole. The lower conical shell is connected to a lower end cap at its lower end and has a liquid inlet hole. The liquid outlet hole and the liquid inlet hole are located on the same side of the plunger body.

[0023] Furthermore, the drug-passing tube includes an upper inclined tube, a middle straight tube, and a lower inclined tube;

[0024] Specifically, the upper inclined tube and the lower inclined tube are inclined in the same direction. The upper end of the upper inclined tube is provided with an upper straight tube connected to the inner wall of the upper head. The lower end of the lower inclined tube is provided with a lower straight tube connected to the inner wall of the lower head. The middle straight tube is located opposite the liquid outlet hole and is close to the inner wall of the middle straight shell of the plunger body.

[0025] Secondly, this utility model provides an oil production tubing string, including an oil pipe and a hollow rod. The lower end of the oil pipe is connected to a hollow oil pump, and the hollow rod is connected to the upper end of the hollow oil pump inside the oil pipe. The hollow oil pump is a type of over-pump viscosity-reducing lift pump as described in one aspect. The lower end of the oil pipe is connected to the upper end of the upper pump barrel, and the lower end of the hollow rod is connected to the upper end of the plunger body. The hollow rod is connected to a reagent channel.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] This invention adds a lateral flow channel for drug injection into the plunger body and offsets the inlet and outlet valves, solving the problem of rapid failure of conventional hollow dosing pump valves and significantly improving the life and reliability of the valve assembly; the entire lifting part has a small increase in weight, so the energy saved by viscosity reduction is greater than the energy consumption caused by the increase in weight, thus increasing economic benefits. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a viscosity-reducing lift pump according to the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of an oil production tubing string according to this utility model.

[0030] In the diagram: 41 Upper plunger connector; 42 Upper pump barrel connector; 43 Drug channel; 44 Upper pump barrel; 45 Plunger body; 46 Inlet valve; 47 Length adaptive tube; 48 Dosing tube; 49 Lower barrel; 410 Cyclone separator; 411 Drug extension tube; 412 Upper end cap; 413 Drug passage tube; 414 Bottom inlet valve; 415 Drug outlet valve; 416 Discharge valve; 417 Discharge hole; 418 Inlet hole; 419 Lower end cap; 420 Liquid passage hole; 421 Drug passage hole.

[0031] 1. Oil pipe; 2. Hollow rod; 3. Top-fill check valve; 4. Hollow disconnector; 5. Hollow oil pump; 6. Pressure test valve; 7. Screen pipe; 8. Plug; 9. Tee; 10. Hollow sucker rod; 11. High-pressure hose; 12. Dosing tank. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Example 1:

[0034] Please see Figure 1 The tools shown in the figure may not be displayed to scale. The present invention provides a pump for reducing viscosity of a liquid, including an upper pump cylinder 44 and a lower cylinder 49. The lower cylinder 49 is provided with a liquid flow channel and a dosing channel. The upper pump cylinder 44 is provided with a plunger body 45. A drug channel 43 passes through the plunger body 45. The lower end of the upper pump cylinder 44 is connected to the upper end of the lower cylinder 49. The upper pump cylinder 44 is connected to the liquid flow channel. The lower end of the drug channel 43 is connected to the dosing channel through a length adaptive tube 47.

[0035] Furthermore, a baffle is provided at the upper end of the inner wall of the lower cylinder 49. The baffle is provided with a liquid passage hole 420 and a medicine passage hole 421. The lower end face of the baffle is connected to the liquid passage hole 420 and the liquid inlet valve 414 is a liquid flow channel. The lower end face of the baffle is connected to the medicine passage hole 421 and the medicine dosing pipe 48 is connected to the medicine outlet valve 415. The inside of the medicine dosing pipe 48 is a medicine dosing channel. The length adaptive pipe 47 is connected to the medicine dosing pipe 48.

[0036] Specifically, the baffle includes a side plate and a horizontal plate. The side plate is provided with a liquid passage hole 420 to enable lateral liquid inlet, and the horizontal plate is provided with a medicine passage hole 421.

[0037] Specifically, the lower end of the dosing tube 48 is connected to the drug extension tube 411 by a thread, and the drug extension tube 411 is provided with a drug dispensing valve 415. The lower end of the length adaptive tube 47 is provided with a threaded connecting ring, and the threaded connecting ring is threadedly connected to the dosing tube 48 inside the dosing tube 48, so that the length adaptive tube 47 can be retracted into the dosing tube 48.

[0038] Preferably, the length-adaptive tube 47 is a spring tube.

[0039] Specifically, a hydrocyclone 410 is provided on the inner wall of the lower cylinder 49, and the lower end of the extended drug tube 411 is located below the hydrocyclone 410, so that the drug can be fully mixed with crude oil during the upward movement; the hydrocyclone 410 is a spiral plate, which accelerates the mixing speed by generating spiral disturbance.

[0040] Specifically, the upper end of the upper pump cylinder 44 is provided with a pump cylinder upper connector 42.

[0041] Furthermore, the upper end of the plunger body 45 is provided with an upper connector 41, the upper connector 41 is provided with an upper end cap 412, the lower end of the plunger body 45 is provided with a lower end cap 419, a medicine passage tube 413 passes through the upper end cap 412 and the lower end cap 419, the medicine passage tube 413 is a medicine channel, the upper end of the plunger body 45 is provided with a liquid outlet hole 417 outside the upper connector 41, the lower end of the plunger body 45 is provided with a liquid inlet hole 418 outside the lower connector end cap, the liquid outlet valve 416 is connected to the liquid outlet hole 417 inside the plunger body 45, and the liquid inlet valve 46 is connected to the liquid inlet hole 418 inside the plunger body 45.

[0042] Specifically, the bottom inlet valve 414, the top inlet valve 46, the outlet valve 416, and the medicine outlet valve are all one-way valves (415). The bottom inlet valve 414, the top inlet valve 46, and the outlet valve 416 are installed for upward liquid discharge, and the medicine outlet valve (415) is installed for downward liquid discharge.

[0043] Specifically, the plunger body 45 includes an upper conical shell, a middle straight shell, and a lower conical shell connected from top to bottom by threads. The upper end of the upper conical shell is threaded to an upper connector 41, and the upper conical shell is provided with a liquid outlet hole 417. The lower end of the lower conical shell is threaded to a lower end cap 419, and the lower conical shell is provided with a liquid inlet hole 418. The liquid outlet hole 417 and the liquid inlet hole 418 are located on the same side of the plunger body 5, so that the liquid inlet and outlet of the plunger body 45 are both lateral.

[0044] Specifically, the drug passage tube 413 includes an upper inclined tube, a middle straight tube, and a lower inclined tube. The upper and lower inclined tubes are inclined in the same direction. The upper end of the upper inclined tube is provided with an upper straight tube that is threaded to the inner wall of the upper end cap 412. The lower end of the lower inclined tube is provided with a lower straight tube that is threaded to the inner wall of the lower end cap 419. The middle straight tube is located opposite the liquid outlet hole 417 and is close to the inner wall of the straight shell in the plunger body 45, so that the drug passage tube 413 will not interfere with the installation of the upper inlet valve 46 and the outlet valve 416. The drug passage tube 413 can withstand an external pressure of 35MPa without deformation.

[0045] Specifically, the lower end of the lower straight pipe passes through the lower end cap 419 and is connected to the upper end of the length adaptive pipe through a pipe thread joint.

[0046] Example 2:

[0047] Based on Example 1, this example provides an oil production tubing string, including an oil pipe 1 and a hollow rod 2. The lower end of the oil pipe 1 is connected to a hollow oil pump 5, and the hollow rod 2 is connected to the upper end of the hollow oil pump 5 inside the oil pipe 1. The hollow oil pump 5 is a type of over-pump viscosity-reducing lift pump as described in Example 1. The lower end of the oil pipe 1 is threadedly connected to a pump barrel upper connector 42, and the lower end of the hollow rod 2 is threadedly connected to a plunger upper connector 41. A hollow disconnector 4 is provided on the hollow rod 2.

[0048] The liquid is delivered to the plunger connector 41 through the hollow rod 2. The liquid enters the well through the drug passage 413, the length adaptive tube 47, the drug passage 413, the drug extension tube 411, and the drug outlet valve 415.

[0049] Specifically, the lower end of the lower cylinder 49 is connected in sequence to the pressure test valve 6, the screen pipe 7, and the plug 8 via an oil pipe.

[0050] Specifically, the hollow rod 2 is equipped with a top-feeding single-flow valve 3 that is installed downwards for liquid discharge.

[0051] Example 3:

[0052] Based on Example 2, this example provides a method for using an oil production tubing string, including the following steps:

[0053] The oil production tubing string described in Example 2 is lowered into the well. After the viscosity-reducing fluid pump reaches the designed position of the oil well, the tubing 1 is placed in the wellhead using a suspension device.

[0054] Using ground pressure testing equipment, the liquid that meets the requirements is pressure tested through oil pipe 1. After the required technical requirements are met, the pressure is increased again, and the pressure test valve 6 at the bottom of the over-pump viscosity reduction pump is removed. The components inside the pressure test valve 6 enter the oil pipe at the bottom of the screen pipe 7 through the screen pipe 7 and fall on the top of the plug 8, without affecting the flow of liquid when the over-pump viscosity reduction pump is pumping.

[0055] The upper part of the hollow rod 2 with the hollow disconnector 4 is connected to the lower part of the connection above the plunger connector 41, thus completing the setting of the oil production tubing string.

[0056] Install the wellhead and accessories. The upper end of the hollow rod 2 is connected to the hollow sucker rod 10. A tee 9 is installed on the hollow sucker rod 10. The tee 9 is connected to the high-pressure hose 11. The high-pressure hose 11 is connected to the outlet of the dosing tank 12.

[0057] After installing the wellhead and its accessories, test pump to a certain pressure. Once the pressure is met, the pumping unit can be installed to begin pumping production.

[0058] The added chemicals are added by the surface chemical dosing tank 12 in appropriate amounts according to the oil well production rate to prevent the produced fluid from cooling down and its viscosity from increasing significantly as it rises along the tubing during pumping and lifting, which could cause the pumping unit to malfunction. The chemicals are driven by the power equipment of the chemical dosing tank 12. The chemicals pass through the high-pressure hose 11, tee 9, hollow sucker rod 10, hollow rod 2, and enter the upper plunger connector 41 through the chemical dosing check valve 3. After passing through the chemical passage pipe 413, the length adaptive pipe 47, the chemical passage pipe 413, the chemical extension pipe 411, and the discharge valve 415, they enter the cavity below the hollow pump 5.

[0059] When the pumping unit is working, it drives the plunger body 45 to move up and down. The added reagents, under the action of the hydrocyclone 410, rapidly fuse with the medium produced from the reservoir, effectively preventing the heavy components in the crude oil from agglomerating and effectively preventing the heavy components in the crude oil from adhering to the inner wall of the oil pipe when flowing in the oil pipe.

[0060] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0061] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0063] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pump down viscosity reducing fluid pump comprising an upper pump barrel, a lower barrel, characterized in that, The lower cylinder is equipped with a liquid flow channel and a chemical dosing channel; A plunger body is provided inside the upper pump cylinder, and a drug channel is provided inside the plunger body; The lower end of the upper pump cylinder is connected to the upper end of the lower cylinder, the upper pump cylinder is connected to the liquid flow channel, and the lower end of the agent channel is connected to the dosing channel through a length adaptive tube.

2. A pump down fluid viscosity reducing pump according to claim 1, wherein, The baffle plate provided at the upper end of the inner wall of the lower cylinder has liquid passage holes and medicine passage holes; The lower end face of the baffle is connected to the bottom inlet valve through the liquid passage hole. The liquid passage valve is a liquid flow channel. The lower end face of the baffle is connected to the dosing pipe through the drug passage hole. The dosing pipe is connected to the dispensing valve. The dosing pipe has a dosing channel inside. The length adaptive pipe is connected to the dosing pipe.

3. A pump down fluid viscosity reducing fluid pump according to claim 2, wherein, The baffle includes a side plate and a cross plate. The side plate is provided with a liquid passage hole, and the cross plate is provided with a medicine passage hole.

4. A pump down fluid viscosity reducing pump according to claim 2, wherein, The lower end of the dosing tube is connected to the drug extension tube, and a drug outlet valve is provided inside the drug extension tube. The lower end of the length adaptive tube is provided with a threaded connecting ring, which is threadedly connected to the dosing tube inside the dosing tube, so that the length adaptive tube can be retracted into the dosing tube.

5. A pump down fluid viscosity reducing fluid pump according to claim 4, wherein, The length-adaptive tube is a spring tube.

6. The viscosity-reducing lift pump according to claim 4, characterized in that, A hydrocyclone is installed on the inner wall of the lower cylinder, and the lower port of the extended drug tube is located below the hydrocyclone.

7. The viscosity-reducing lift pump according to claim 1, characterized in that, The upper end of the plunger body is provided with an upper connector, the upper connector is provided with an upper end cap, the lower end of the plunger body is provided with a lower end cap, and a drug passage tube is passed through the upper end cap and the lower end cap, the drug passage tube being a drug channel; The upper end of the plunger body is provided with a liquid outlet hole on the outside of the upper connector, and the lower end of the plunger body is provided with a liquid inlet hole on the outside of the lower connector. The liquid outlet valve is connected to the liquid outlet hole inside the plunger body, and the liquid inlet valve is connected to the liquid inlet hole inside the plunger body.

8. A viscosity-reducing lift pump according to claim 7, characterized in that, The plunger body includes an upper conical shell, a middle straight shell, and a lower conical shell connected from top to bottom; The upper conical shell is connected to the upper connector at its upper end and has a liquid outlet hole. The lower conical shell is connected to the lower end cap and has a liquid inlet hole. The liquid outlet hole and the liquid inlet hole are located on the same side of the plunger body.

9. A viscosity-reducing lift pump according to claim 8, characterized in that, The drug passage tube includes an upper inclined tube, a middle straight tube, and a lower inclined tube; The upper inclined tube and the lower inclined tube are inclined in the same direction. The upper end of the upper inclined tube is provided with an upper straight tube that connects to the inner wall of the upper head. The lower end of the lower inclined tube is provided with a lower straight tube that connects to the inner wall of the lower head. The middle straight tube is located opposite the liquid outlet hole and is close to the inner wall of the middle straight shell of the plunger body.

10. An oil production tubing string, comprising tubing and a hollow rod, wherein the lower end of the tubing is connected to a hollow pumping unit, and the hollow rod is connected to the upper end of the hollow pumping unit inside the tubing, characterized in that... The hollow oil pump is a viscosity-reducing lift pump as described in claim 1; The lower end of the oil pipe is connected to the upper end of the upper pump cylinder, the lower end of the hollow rod is connected to the upper end of the plunger body, and the hollow rod is connected to the drug channel.

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