Hollow rod force-reduction deep drawing device

Abstract

A kind of hollow rod relay load reduction deep pumping device, hollow hydraulic feedback pump is combined into an organic whole with the lower part of hollow sucker rod load reduction pumping device, the fixed part of hollow hydraulic feedback pump is integrated with load reduction lower pump cylinder, the reciprocating part of hollow hydraulic feedback pump is integrated with inner communication joint, the central hole is communicated with the internal passage of inner tube, when the reciprocating part of hollow hydraulic feedback pump and load reduction lower plunger synchronous reciprocate, well fluid enters the hollow hydraulic feedback pump from the oil inlet, well fluid is discharged from the oil outlet after being pressurized by the hollow hydraulic feedback pump, then flows out from the outflow communication groove, load reduction lower pump cylinder and hollow hydraulic feedback pump are placed in outer tube, outer communication joint is connected to the upper part of outer tube, annular passage is formed between outer tube and load reduction lower pump cylinder and hollow hydraulic feedback pump, the upper part of annular passage is communicated with the lateral communication hole, the lower part of annular passage is communicated with the inlet of hydraulic feedback pump.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of oil pumping device for oil field, it is a hollow rod force reduction deep pumping device. BACKGROUND

[0002] The reciprocating rod pump oil pumping device for oil field, including pumping unit, sucker rod, oil pump, oil pipe, pumping unit is installed on the ground, sucker rod, oil pump, oil pipe is installed in the wellbore of oil well, pumping unit drives the reciprocating motion of oil pump by sucker rod and moves downhole crude oil to the ground.If reciprocating rod pump oil pumping (deep pumping, ultra-deep refers to pumping down to kilometer or even several kilometers below) is used in deep well, ultra-deep, its sucker rod, oil pipe load is large, the stroke loss generated by the elastic expansion of sucker rod, oil pipe, the gap loss between oil pump plunger and pump cylinder is large, the service life of oil pipe, sucker rod, oil pump is short, pump efficiency and system efficiency is low.

[0003] In order to solve the above problems, the technical personnel developed the device for reducing the load of sucker rod. It is installed on the oil pipe, sucker rod between wellhead and oil pump, to reduce the load of upper sucker rod and pumping unit. Such as Chinese patent 201220295713.1 "sucker rod load reduction device", but this device can only achieve the purpose of reducing the load of the sucker rod above the device, cannot reduce the liquid column pressure of the oil pump installed below the device and the problems caused, and the well fluid extracted by this device occupies the central passage, cannot cooperate with the hollow sucker rod to lower the equipment or liquid into the central passage for heavy oil exploitation.

[0004] Therefore, the technical personnel developed the hollow sucker rod load reduction oil pumping device, which is installed on the oil pipe, sucker rod between wellhead and oil pump. This device can generate upward thrust at the installation of the pipe column, reduce the load of the sucker rod and pumping unit, increase the pump depth or improve the displacement. The inside of this device can also pass through the cable, lower the cable below the device, and can pour the viscosity-reducing fluid below the device to reduce the viscosity of heavy oil, improve the flowability of crude oil, and prevent the pumping passage from being blocked. But this technology still cannot reduce the liquid column pressure of the oil pump installed below the device and the problems caused.

[0005] Therefore, the skilled in the art has developed a segmented oil pumping device with a rod pump, which is installed on the tubing and the sucker rod between the well head and the oil pumping pump. The device overcomes the problems of the hollow sucker rod load reduction oil pumping device: 1. It can generate upward thrust at the installation of the pipe string, reducing the load of the sucker rod above the device; 2. It can reduce the liquid column pressure of the oil pumping pump installed below the device and the problems caused by it (relay oil pumping); 3. It can cooperate with the hollow sucker rod to lower the equipment into the central passage or inject liquid for heavy oil exploitation. However, the load reduction mechanism on the device is provided with a communication hole, which connects the upper end surface of the lower plunger with the casing, so that there is a pressure difference between the upper and lower end surfaces of the lower plunger, achieving the purpose of generating upward thrust at the installation of the pipe string. Therefore, it is necessary to provide the communication hole on the load reduction mechanism. However, after the communication hole is provided, three problems are caused. The first problem is that when the dynamic liquid level of the oil well is high, the pressure difference between the upper and lower end surfaces of the lower plunger decreases, which will affect the load reduction effect; the second problem is that when the casing is mixed with thin oil to reduce viscosity and pump heavy oil, the casing is filled with thin oil, the pressure difference between the upper and lower end surfaces of the lower plunger is zero, and there is no load reduction effect; the third problem is that the gap between the upper pump cylinder and the upper plunger, and the lower pump cylinder and the lower plunger leaks liquid to the casing, which will lose this part of liquid amount and reduce the oil well production. SUMMARY

[0006] The purpose of the present application is to design a hollow rod relay load reduction deep pumping device, which overcomes the above-mentioned problems, reduces the liquid column pressure and liquid column load borne by the rod, pipe and pump, can cooperate with the hollow sucker rod to lower the equipment into the central passage or inject liquid for heavy oil exploitation, and eliminate the influence of casing pressure on the load reduction effect.

[0007] The purpose of the present application is achieved by comprising a hollow sucker rod load reduction oil pumping device and a hollow hydraulic feedback pump.

[0008] The hollow rod load-reducing pumping device comprises an upper hollow rod joint, a load-reducing upper pump barrel, a load-reducing upper plunger, an outer communication joint, an inner tube, a load-reducing lower plunger, a load-reducing lower pump barrel and an inner communication joint.

[0009] The hollow hydraulic feedback pump comprises two pump barrels with different pump diameters, two plungers matched with the pump barrels, an oil inlet valve, an oil outlet valve and a connecting piece.

[0010] The hollow hydraulic feedback pump is combined with the lower part of the hollow rod load-reducing pumping device, the fixed part of the hollow hydraulic feedback pump is integrated with the load-reducing lower pump barrel, the reciprocating part of the hollow hydraulic feedback pump is integrated with the inner communication joint, the central hole is communicated with the inner channel of the inner tube, and when the reciprocating part of the hollow hydraulic feedback pump reciprocates synchronously with the load-reducing lower plunger, well fluid enters the hollow hydraulic feedback pump from the oil inlet port, the well fluid is pressurized by the hollow hydraulic feedback pump and discharged from the oil outlet port, and then flows out from the outflow communication groove.

[0011] The hollow hydraulic feedback pump is combined with the lower part of the hollow rod load-reducing pumping device, the fixed part of the hollow hydraulic feedback pump is integrated with the load-reducing lower pump barrel, the reciprocating part of the hollow hydraulic feedback pump is integrated with the inner communication joint, the central hole is communicated with the inner channel of the inner tube, and when the reciprocating part of the hollow hydraulic feedback pump reciprocates synchronously with the load-reducing lower plunger, well fluid enters the hollow hydraulic feedback pump from the oil inlet port, the well fluid is pressurized by the hollow hydraulic feedback pump and discharged from the oil outlet port, and then flows out from the outflow communication groove.

[0012] The hollow hydraulic feedback pump is combined with the lower part of the hollow rod load-reducing pumping device, the fixed part of the hollow hydraulic feedback pump is integrated with the load-reducing lower pump barrel, the reciprocating part of the hollow hydraulic feedback pump is integrated with the inner communication joint, the central hole is communicated with the inner channel of the inner tube, and when the reciprocating part of the hollow hydraulic feedback pump reciprocates synchronously with the load-reducing lower plunger, well fluid enters the hollow hydraulic feedback pump from the oil inlet port, the well fluid is pressurized by the hollow hydraulic feedback pump and discharged from the oil outlet port, and then flows out from the outflow communication groove.

[0013] 1. Reduce the liquid column pressure and load on the rod, pipe and pump installed below the invention, increase the liquid volume discharged by the pump, and prolong the service life of the lower rod, pipe and pump.

[0014] 2. The hollow sucker rod load reduction oil pumping device has an outer pipe, so that the load reduction effect is not affected by the casing pressure, and a larger upward thrust can be generated at the installation position of the invention, thereby reducing the load on the sucker rod above the invention.

[0015] 3. It can cooperate with the hollow sucker rod to lower the equipment into the central channel or inject liquid to exploit thick oil. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is an assembly drawing of an embodiment of the invention. EMBODIMENT

[0017] The embodiments of the invention will be described below. Figure 1 The embodiments of the invention will be described below.

[0018] As shown in the drawings, the embodiments of the invention include a hollow sucker rod load reduction oil pumping device, a hollow hydraulic feedback pump 9, and an outer pipe 10. Figure 1 The hollow sucker rod load reduction oil pumping device includes an upper hollow rod joint 1, a load reduction upper pump cylinder 2, a load reduction upper plunger 3, an outer communication joint 4, an inner pipe 5, a load reduction lower plunger 6, a load reduction lower pump cylinder 7, and an inner communication joint 8. The pump diameter of the load reduction upper pump cylinder 2 is smaller than that of the load reduction lower pump cylinder 7. The load reduction upper plunger 3 is in the load reduction upper pump cylinder 2, and the load reduction upper plunger 3 is sealed with the load reduction upper pump cylinder 2. The upper hollow rod joint 1, the load reduction upper plunger 3, the load reduction lower plunger 6, and the inner communication joint 8 are connected in sequence. The upper hollow rod joint 1 has an outflow communication groove 1-1. The inner communication joint 8 has an inflow communication groove 8-1. The load reduction upper pump cylinder 2, the outer communication joint 4, and the load reduction lower pump cylinder 7 are connected in sequence. The load reduction lower plunger 6 is in the load reduction lower pump cylinder 7, and the load reduction lower plunger 6 is sealed with the load reduction lower pump cylinder 7. The outer communication joint 4 has a lateral communication hole 4-1, which communicates with the lower end of the load reduction upper pump cylinder 2 and the upper end of the load reduction lower pump cylinder 7. The inner pipe 5 is installed between the upper hollow rod joint 1 and the inner communication joint 8. The inner pipe 5 has a liquid outlet channel 5-1 between the load reduction lower plunger 6 and the load reduction upper plunger 3. The upper end of the inner pipe 5 is sealed with the upper hollow rod joint 1. The sealing position between the upper end of the inner pipe 5 and the upper hollow rod joint 1 is above the outflow communication groove 1-1. The lower end of the inner pipe 5 is sealed with the inner communication joint 8. The sealing position between the lower end of the inner pipe 5 and the inner communication joint 8 is below the inflow communication groove 8-1. The well fluid flowing from the inflow communication groove 8-1 into the liquid outlet channel 5-1 can only flow out of the outflow communication groove 1-1.

[0019]

[0020] ​The hollow hydraulic feedback pump 9 is composed of two pump cylinders with different diameters, two plungers matched with the pump cylinders, an oil inlet valve, an oil outlet valve and a connecting piece.

[0021] The hollow hydraulic feedback pump 9 is combined with the lower part of the hollow sucker rod load-reducing oil pumping device, the fixed part of the hollow hydraulic feedback pump 9 is integrated with the load-reducing lower pump cylinder 7, the reciprocating part of the hollow hydraulic feedback pump 9 is integrated with the inner communication joint 8, the central hole 9-2 is communicated with the internal passage of the inner tube 5, when the reciprocating part of the hollow hydraulic feedback pump 9 reciprocates synchronously with the load-reducing lower plunger 6, well fluid enters the hollow hydraulic feedback pump 9 from the oil inlet port 9-3, the well fluid is pressurized by the hollow hydraulic feedback pump 9 and then discharged from the oil outlet port 9-1, and then flows out from the outflow communication groove 1-1.

[0022] The load-reducing lower pump cylinder 7 and the hollow hydraulic feedback pump 9 are placed in the outer tube 10, the outer communication joint 4 is connected to the upper part of the outer tube 10, the lateral communication hole 4-1 is in the outer tube 10, the annular passage 10-1 is formed between the outer tube 10 and the load-reducing lower pump cylinder 7 and the hollow hydraulic feedback pump 9, the upper part of the annular passage 10-1 is communicated with the lateral communication hole 4-1, and the lower part of the annular passage 10-1 is communicated with the inlet of the hydraulic feedback pump 9.

[0023] The present application is installed on the oil pipe and the hollow sucker rod between the wellhead and the oil pumping pump. The upper part of the present application is connected with the lower part of the upper oil pipe, the lower part of the upper oil pipe is connected with the wellhead, the upper part of the upper hollow rod joint 1 is connected with the upper hollow sucker rod, and the upper part of the upper hollow sucker rod is connected with the oil pumping machine.

[0024] When pumping oil, the upper hollow rod joint 1, the load-reducing upper plunger 3, the inner tube 5, the load-reducing lower plunger 6, the inner communication joint 8 and the reciprocating part of the hollow hydraulic feedback pump 9 reciprocate with the hollow sucker rod. The oil pumping pump installed below the present application pumps well fluid into the hollow hydraulic feedback pump 9 (from the oil inlet port 9-3), the oil inlet valve and the oil outlet valve in the hollow hydraulic feedback pump 9 are alternately opened and closed, so that the well fluid is pressurized and then discharged from the oil outlet port 9-1, and then flows to the present application above through the inflow communication groove 8-1, the outlet passage 5-1 and the outflow communication groove 1-1, realizing relay oil pumping and reducing the pressure of the oil pumping pump below the present application, achieving the first beneficial effect of the present application.

[0025] In the hollow sucker rod load-reducing pumping device composed of the upper hollow rod joint 1, the upper load-reducing pump cylinder 2, the upper load-reducing plunger 3, the outer communication joint 4, the inner tube 5, the lower load-reducing plunger 6, the lower load-reducing pump cylinder 7 and the inner communication joint 8, because the outer tube 10 is installed, the upper end surface of the lower load-reducing plunger 6 is communicated with the oil inlet 9-3, and under the working of the hollow hydraulic feedback pump 9, the pressure of the upper end surface of the lower load-reducing plunger 6 is basically zero. Therefore, the present application can generate an upward thrust at the installation position of the pipe string, thereby reducing the load of the sucker rod and the pumping unit, and achieving the second beneficial effect of the present application.

[0026] The central hole 9-2 is communicated with the internal passage of the inner tube 5, and after the hollow sucker rod is connected, the present application can lower the equipment or pour the liquid into the central passage for thick oil exploitation, and achieves the third beneficial effect of the present application.

[0027] When the thick oil well implements the thinning process, the mixed thin oil fills the casing, and a large liquid column pressure is formed in the casing. The outer tube 10 is installed in the present application, and the liquid column pressure formed by the mixed thin oil in the casing will not act on the upper end surface of the lower load-reducing plunger 6. Therefore, when the casing is mixed with thin oil to reduce the viscosity of thick oil, the load-reducing effect will not be affected.

[0028] After the outer tube 10 is installed to form the annular passage 10-1, the lost circulation liquid generated between the load-reducing upper pump cylinder 2 and the load-reducing upper plunger 3 and between the load-reducing lower plunger 6 and the load-reducing lower pump cylinder 7 is returned to the oil inlet 9-3, and is recovered by the hollow hydraulic feedback pump 9. Therefore, the present application eliminates the yield loss of the existing sucker rod load-reducing device, and can improve the yield of the oil well.

[0029] The structure of the hollow hydraulic feedback pump 9 is as disclosed in the structure of Figure 9 (electric heating thick oil pumping pump) in SY / T 7083-2016, and the structure of the hollow hydraulic feedback pump 9 has multiple types, which can be matched with the hollow sucker rod load-reducing pumping device in the present application to produce the same effect as the present application, and the hollow hydraulic feedback pump with the same effect as the present application is within the protection scope of the present application.

[0030] When the hollow hydraulic feedback pump 9 is integrated with the lower part of the hollow sucker rod load-reducing pumping device, the load-reducing lower pump cylinder 7 can be a component on the hollow hydraulic feedback pump 9, and a component on the hollow hydraulic feedback pump 9 can also be the load-reducing lower pump cylinder 7, that is, the hollow sucker rod load-reducing pumping device and the hollow hydraulic feedback pump 9 can share the load-reducing lower pump cylinder 7.

[0031] In the "combination" of "the hollow hydraulic feedback pump 9 is combined with the lower part of the hollow sucker rod load-reducing pumping device", there are two cases. One case is that the hollow sucker rod load-reducing pumping device shares the load-reducing lower pump cylinder 7 with the hollow hydraulic feedback pump 9, and then the hollow sucker rod load-reducing pumping device and the hollow hydraulic feedback pump 9 are integrated, and the present application has only three pump cylinders. The other case is that the hollow sucker rod load-reducing pumping device does not share the load-reducing lower pump cylinder 7 with the hollow hydraulic feedback pump 9, and then the present application has four pump cylinders, and the load-reducing lower pump cylinder 7 is combined with the upper pump cylinder of the hollow hydraulic feedback pump 9.

[0032] The sealing of the plunger and the pump cylinder refers to the requirements specified in the GB / T 17607 standard. The pump diameter refers to the inner diameter of the pump cylinder of the oil pump.

Claims

1. A hollow rod booster load-reducing deep pumping device, comprising a hollow rod load-reducing pumping device and a hollow hydraulic feedback pump (9). wherein The hollow rod load-reducing pumping device comprises an upper hollow rod joint (1), a load-reducing upper pump barrel (2), a load-reducing upper plunger (3), an outer communication joint (4), an inner tube (5), a load-reducing lower plunger (6), a load-reducing lower pump barrel (7), an inner communication joint (8), the pump diameter of the load-reducing upper pump barrel (2) is smaller than that of the load-reducing lower pump barrel (7), the load-reducing upper plunger (3) is in the load-reducing upper pump barrel (2), the load-reducing upper plunger (3) is sealed with the load-reducing upper pump barrel (2), the upper hollow rod joint (1), the load-reducing upper plunger (3), the load-reducing lower plunger (6), and the inner communication joint (8) are connected in sequence, the upper hollow rod joint (1) has an outflow communication groove (1-1), the inner communication joint (8) has an inflow communication groove (8-1), the load-reducing upper pump barrel (2), the outer communication joint (4), and the load-reducing lower pump barrel (7) are connected in sequence, the load-reducing lower plunger (6) is in the load-reducing lower pump barrel (7), the load-reducing lower plunger (6) is sealed with the load-reducing lower pump barrel (7), the outer communication joint (4) has a lateral communication hole (4-1), the lateral communication hole (4-1) is communicated with the lower end of the load-reducing upper pump barrel (2) and the upper end of the load-reducing lower pump barrel (7), the inner tube (5) is installed between the hollow rod joint (1) and the inner communication joint (8), the inner tube (5) and the load-reducing lower plunger (6) and the load-reducing upper plunger (3) form a liquid outlet channel (5-1), the upper end of the inner tube (5) is sealed with the hollow rod joint (1), the sealing part between the upper end of the inner tube (5) and the hollow rod joint (1) is above the outflow communication groove (1-1), the lower end of the inner tube (5) is sealed with the inner communication joint (8), the sealing part between the lower end of the inner tube (5) and the inner communication joint (8) is below the inflow communication groove (8-1), and well fluid flowing from the inflow communication groove (8-1) into the liquid outlet channel (5-1) can only flow out of the outflow communication groove (1-1). The hollow hydraulic feedback pump (9) is composed of two pump barrels with different pump diameters, two plungers matched with the pump barrels, an oil inlet valve, an oil outlet valve, and a connecting piece, the upper part of the hollow hydraulic feedback pump (9) has an oil outlet (9-1), the lower part has an oil inlet (9-3), and the inside has a central hole (9-2). The hollow hydraulic feedback pump (9) is combined with the lower part of the hollow rod load-reducing pumping device into one body, the fixed part of the hollow hydraulic feedback pump (9) is integrated with the load-reducing lower pump barrel (7), the reciprocating part of the hollow hydraulic feedback pump (9) is integrated with the inner communication joint (8), the central hole (9-2) is communicated with the internal passage of the inner tube (5), and when the reciprocating part of the hollow hydraulic feedback pump (9) reciprocates synchronously with the load-reducing lower plunger (6), well fluid enters the hollow hydraulic feedback pump (9) from the oil inlet (9-3), is pressurized by the hollow hydraulic feedback pump (9), and is discharged from the oil outlet (9-1) and then flows out of the outflow communication groove (1-1). The feature is that the outer pipe (10) is further included, the load-relief lower pump cylinder (7) and the hollow hydraulic feedback pump (9) are put into the outer pipe (10), the outer communication joint (4) is connected to the upper part of the outer pipe (10), the lateral communication hole (4-1) is in the outer pipe (10), the annular channel (10-1) is formed between the outer pipe (10) and the load-relief lower pump cylinder (7) and the hollow hydraulic feedback pump (9), the upper part of the annular channel (10-1) is communicated with the lateral communication hole (4-1), the lower part of the annular channel (10-1) is communicated with the inlet of the hollow hydraulic feedback pump (9); the outer pipe (10) and the annular channel (10-1) are arranged, so that the upper end surface of the load-relief lower piston (6) is communicated with the oil inlet (9-3), thereby the pressure of the upper end surface of the load-relief lower piston (6) is substantially zero to generate upward thrust, and the leakage liquid generated in the gap between the load-relief upper pump cylinder (2) and the load-relief upper piston (3) and the gap between the load-relief lower piston (6) and the load-relief lower pump cylinder (7) is returned to the oil inlet (9-3) and is recovered.

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