Hollow sucker rod transfer and load-reducing deep pumping device

Abstract

When the piston rod is in the oil pump, the end cap moves up and down, and the piston rod of the oil pump stretches out the up-down knob. When the piston rod is in the oil pumping state, the piston rod of the oil pumping state is rotated together. When the piston rod is in the oil pumping state, the piston rod of the oil pumping state is rotated together. When the piston rod is in the oil pumping state, the piston rod of the oil pumping state is rotated together.

Description

Technical Field

[0001] The invention relates to an oil pumping device for oil fields, which is a hollow sucker rod connected to reduce load and deep pumping device. Background Art

[0002] The reciprocating rod pumping system used in oil fields consists of a pumping unit, sucker rod, pump, and tubing. The pumping unit is installed on the ground, while the sucker rod, pump, and tubing are installed in the wellbore. The pumping unit drives the pump through the sucker rod to reciprocate, drawing crude oil from the wellbore to the surface. Using a reciprocating rod pump in deep or ultra-deep wells (deep and ultra-deep pumping refers to pumping oil down to depths of thousands or even tens of thousands of meters), the rod and tubing are subject to heavy loads, resulting in significant stroke losses from the elastic expansion and contraction of the rod and tubing, and significant leakage between the pump plunger and the pump barrel. This shortens the service life of the tubing, sucker rod, and pump, leading to low pump and system efficiency.

[0003] To address these issues, researchers have developed a device to reduce the load on the sucker rods. Installed on the tubing and sucker rods between the wellhead and the pump, it reduces the load on the upper sucker rods and pumping units. This is exemplified by Chinese Patent 201220295713.1, "Sucker Rod Load Reduction Device." However, this device only reduces the load on the sucker rods above the device; it fails to mitigate the fluid pressure and associated problems in the pumps below. Furthermore, the well fluid pumped from this device occupies the central channel, making it impossible to operate hollow sucker rods to lower equipment or pump fluid into the central channel for heavy oil recovery.

[0004] To this end, technicians developed a hollow sucker rod load-reducing pumping device. This device is installed on the oil pipe and sucker rod between the wellhead and the oil pump. This device can generate an upward thrust at the installation point of the pipe string, reducing the load on the sucker rod and the oil pumping unit, increasing the pumping depth or increasing the displacement. The device can also pass a cable through the inside of the device. The cable is lowered below the device and can be used to pump a viscosity-reducing fluid under the device to reduce the viscosity of the heavy oil, improve the fluidity of the crude oil, and prevent the blockage of the oil pumping channel. However, this technology still cannot reduce the liquid column pressure of the oil pump installed below the device and the problems it brings.

[0005] To address this issue, technicians developed a rod pumping sectional pumping device. This device is installed on the tubing and sucker rods between the wellhead and the pump. This device overcomes the problems of the aforementioned "hollow rod unloading pumping device": 1. It generates an upward thrust at the tubing installation point, reducing the load on the sucker rod above the device; 2. It reduces the liquid column pressure and the resulting problems (relay pumping) in the pump installed below the device; and 3. It can be used with the hollow sucker rod to lower equipment or pump liquid into the central channel for heavy oil recovery. However, the unloading mechanism of this device has a connecting hole, which connects the upper end of the lower plunger to the casing, creating a pressure differential between the upper and lower ends of the lower plunger, thereby generating upward thrust at the tubing installation point. Therefore, the provision of a connecting hole in the unloading mechanism is necessary. However, this connecting hole also caused three problems. The first problem was that when the dynamic liquid level of the oil well was high, the pressure difference between the upper and lower ends of the lower plunger decreased, which would affect the load-reducing effect. The second problem was that when the casing was mixed with thin oil to reduce viscosity and pump out heavy oil, the casing was filled with thin oil, and the pressure difference between the upper and lower ends of the lower plunger was zero, resulting in no load-reducing effect. The third problem was that the gaps between the upper pump barrel and the upper plunger, and between the lower pump barrel and the lower plunger leaked into the casing, causing the loss of this part of the liquid and reducing the oil well production. Summary of the Invention

[0006] The purpose of the present invention is to design a hollow sucker rod transfer and load-reducing deep pumping device to overcome the above-mentioned problems, reduce the liquid column pressure and liquid column load borne by the rod, pipe and pump, cooperate with the hollow sucker rod to lower equipment into the central channel or inject liquid for heavy oil production, and eliminate the influence of casing pressure on the load-reducing effect.

[0007] The purpose of the present invention is achieved in this way: a hollow sucker rod transfer unloading deep pumping device includes a hollow hydraulic feedback pump, which is mainly composed of two pump barrels with different pump diameters, two plungers matching the pump barrels, an oil inlet valve, an oil outlet valve and connecting parts. The upper part of the hollow hydraulic feedback pump has an oil outlet and the lower part has an oil inlet. It also includes an upper pump barrel, an upper hollow piston, a reducing pump barrel joint, a reducing piston joint, a lower pump barrel, a lower hollow piston, an outer tube and a hollow tube. The pump diameter of the upper pump barrel is smaller than the pump diameter of the lower pump barrel. The upper pump barrel, the reducing pump barrel joint and the lower pump barrel are connected in sequence. The lower part of the upper hollow piston is connected to the reducing piston joint. The upper thread connection of the hollow tube is connected to the middle thread of the reducing piston joint, so that the upper hollow piston is communicated with the hollow tube, the lower thread of the reducing piston joint is connected to the upper part of the lower hollow piston, and the upper section of the discharge channel is formed between the inner wall of the lower hollow piston and the outer wall of the hollow tube. The upper hollow piston penetrates into the upper pump barrel, and the lower hollow piston is in the lower pump barrel. The upper hollow piston cooperates with the upper pump barrel to seal, and the lower hollow piston cooperates with the lower pump barrel to seal. A breathing chamber is formed between the inner walls of the upper hollow piston and the lower pump barrel due to the diameter difference between the two. There is a connecting groove on the reducing piston joint, and the breathing chamber is communicated with the upper section of the discharge channel through the connecting groove. , so that the leakage fluid between the upper hollow piston and the upper pump barrel and between the lower hollow piston and the lower pump barrel can flow downward through the interior of the lower hollow piston, the lower pump barrel is placed in the outer tube, the lower part of the reducing pump barrel joint is connected to the upper part of the outer tube, and a vertical flow channel is provided on the side wall of the reducing pump barrel joint. An annular channel is formed between the lower pump barrel and the outer tube, and the vertical flow channel is communicated with the upper part of the annular channel. The hollow hydraulic feedback pump is sleeved outside the hollow tube, the upper part of the fixed part of the hollow hydraulic feedback pump is connected to the lower part of the outer tube, the oil inlet is communicated with the lower part of the annular channel, and the hollow hydraulic feedback The upper part of the reciprocating part of the pump is connected to the lower part of the lower hollow piston, and a lower section of the leakage channel is provided between the outer wall of the hollow tube and the inner wall of the hollow hydraulic feedback pump. The upper end of the lower section of the leakage channel is communicated with the upper section of the leakage channel, and the lower end of the lower section of the leakage channel is open and is in the same pressure system as the oil inlet. When the reciprocating part of the hollow hydraulic feedback pump and the lower hollow piston reciprocate synchronously, the well fluid enters the hollow hydraulic feedback pump from the oil inlet, and is pressurized by the hollow hydraulic feedback pump and discharged from the oil outlet, and then flows out from the vertical flow channel.

[0008] The beneficial effects of the present invention are as follows: the present invention is installed on the oil pipe and the sucker rod between the wellhead and the oil pump to realize segmented relay load-reducing oil pumping, which has the following beneficial effects.

[0009] 1. The liquid column pressure and liquid column load borne by the rod, pipe and pump installed under the present invention are reduced, the amount of liquid discharged by the oil well pump can be increased, and the service life of the lower rod, pipe and pump can be extended.

[0010] 2. The hollow sucker rod load-reducing pumping device is provided with an outer tube, so that the load-reducing effect is not affected by the casing pressure, and a larger upward thrust can be generated at the installation location of the present invention, thereby reducing the load on the sucker rod above the present invention.

[0011] 3. It can cooperate with the hollow sucker rod to lower equipment into the central channel or inject liquid for heavy oil production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an assembly drawing of an embodiment of the present invention. DETAILED DESCRIPTION

[0013] The following combination Figure 1 An embodiment of the present invention will be described.

[0014] like Figure 1As shown, the embodiment of the hollow sucker rod transfer unloading deep pumping device of the present invention includes a hollow hydraulic feedback pump 9, which is mainly 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 connecting parts. The upper part of the hollow hydraulic feedback pump 9 has an oil outlet 9-1 and the lower part has an oil inlet 9-3. It also includes an upper pump barrel 1, an upper hollow piston 2, a reducing pump barrel joint 3, a reducing piston joint 4, a lower pump barrel 5, a lower hollow piston 6, an outer tube 7, and a hollow tube 8. The pump diameter of the upper pump barrel 1 is smaller than the pump diameter of the lower pump barrel 5. The upper pump barrel 1, the reducing pump barrel joint 3, and the lower pump barrel 5 are connected in sequence. The lower part of the upper hollow piston 2 is connected to the upper thread of the reducing piston joint 4. The hollow tube The upper part of 8 is connected with the middle thread of the reducing piston joint 4, so that the upper hollow piston 2 is communicated with the hollow tube 8, the lower thread of the reducing piston joint 4 is connected with the upper part of the lower hollow piston 6, and the upper section 6-1 of the discharge channel is formed between the inner wall of the lower hollow piston 6 and the outer wall of the hollow tube 8. The upper hollow piston 2 penetrates into the upper pump barrel 1, and the lower hollow piston 6 is in the lower pump barrel 5. The upper hollow piston 2 and the upper pump barrel 1 are sealed together, and the lower hollow piston 6 and the lower pump barrel 5 are sealed together. A breathing chamber 5-1 is formed between the inner walls of the upper hollow piston 2 and the lower pump barrel 5 due to the diameter difference between the two. There is a connecting groove 4-1 on the reducing piston joint 4, and the breathing chamber 5-1 is communicated with the upper section 6-1 of the discharge channel through the connecting groove 4-1, so that the upper hollow piston The leaked fluid between the core piston 2 and the upper pump barrel 1 and between the lower hollow piston 6 and the lower pump barrel 5 can flow downward through the interior of the lower hollow piston 6. The lower pump barrel 5 is placed in the outer tube 7. The lower part of the reducing pump barrel joint 3 is connected to the upper part of the outer tube 7. There is a vertical flow channel 3-1 on the side wall of the reducing pump barrel joint 3. An annular channel 7-1 is formed between the lower pump barrel 5 and the outer tube 7. The vertical flow channel 3-1 is communicated with the upper part of the annular channel 7-1. The hollow hydraulic feedback pump 9 is sleeved on the outside of the hollow tube 8. The upper part of the fixed part of the hollow hydraulic feedback pump 9 is connected to the lower part of the outer tube 7. The oil inlet 9-1 is communicated with the lower part of the annular channel 7-1. 9 is connected to the lower part of the lower hollow piston 6, and there is a lower section 9-2 of the leakage channel between the outer wall of the hollow tube 8 and the inner wall of the hollow hydraulic feedback pump 9. The upper end of the lower section 9-2 of the leakage channel is communicated with the upper section 6-1 of the leakage channel, and the lower end of the lower section 9-2 of the leakage channel is open and is in the same pressure system as the oil inlet 9-3. When the reciprocating part of the hollow hydraulic feedback pump 9 reciprocates synchronously with the lower hollow piston 6, the well fluid enters the hollow hydraulic feedback pump 9 from the oil inlet 9-3, and the well fluid is pressurized by the hollow hydraulic feedback pump 9 and discharged from the oil outlet 9-1, and then flows out from the vertical flow channel 3-1.

[0015] The present invention is installed on the oil pipe and hollow sucker rod between the wellhead and the oil pump. The lower portion of the present invention is connected to the lower oil pipe and the lower hollow sucker rod. The outer upper portion of the present invention is connected to the lower portion of the upper oil pipe, the upper portion of the upper oil pipe is connected to the wellhead, the upper portion of the upper hollow piston 1 is connected to the upper hollow sucker rod, and the upper portion of the upper hollow sucker rod is connected to the pumping unit.

[0016] During oil pumping, the upper hollow piston 2, the reducing piston joint 4, the lower hollow piston 6, the hollow tube 8, and the reciprocating portion of the hollow hydraulic feedback pump 9 reciprocate along with the hollow sucker rod. The oil pump installed in accordance with the present invention pumps well fluid into the hollow hydraulic feedback pump 9. The inlet and outlet valves within the hollow hydraulic feedback pump 9 are alternately opened and closed, pressurizing the well fluid there before it is discharged from the oil outlet 9-1. The fluid then flows through the annular passage 7-1 and the vertical flow passage 3-1 to the upper portion of the present invention, achieving relay pumping (relay pumping), reducing the pressure within the oil pump, and achieving the first beneficial effect of the present invention.

[0017] The hollow sucker rod load-reducing pumping device, primarily composed of an upper pump barrel 1, an upper hollow piston 2, a reducing pump barrel joint 3, a reducing piston joint 4, a lower pump barrel 5, and a lower hollow piston 6, features a hollow tube 8. A lower section 9-2 of a drain channel is located between the hollow tube 8 and the hollow hydraulic feedback pump 9, allowing the upper end surface of the lower hollow piston 6 to communicate with the oil inlet 9-3. When the hollow hydraulic feedback pump 9 is operating, the pressure on the upper end surface of the lower hollow piston 6 is essentially zero. Therefore, the present invention can generate an upward thrust at the installation point of the tubing string, thereby reducing the load on the sucker rod and pumping unit, achieving the second beneficial effect of the present invention.

[0018] The upper hollow piston 2 is communicated with the hollow tube 8. After the upper and lower hollow sucker rods are connected, equipment can be lowered into the central channel or liquid can be pumped in to carry out heavy oil production, thereby achieving the third beneficial effect of the present invention.

[0019] When a heavy oil well is subjected to a thinning process, the thin oil added fills the casing, generating a large liquid column pressure within the casing. However, in the present invention, the liquid column pressure generated by the thin oil added within the casing does not act on the upper end surface of the lower hollow piston 6. Therefore, the present invention does not affect the load shedding effect when performing casing thinning to reduce viscosity and pump heavy oil.

[0020] During the installation of the present invention, the breathing chamber 5-1 is connected to the connecting groove 4-1, the upper section 6-1 of the leakage channel, and the lower section 9-2 of the leakage channel, so that the leakage fluid generated in the gap between the upper pump barrel 1 and the upper hollow piston 2, and the lower hollow piston 6 and the lower pump barrel 5 flows back to the oil inlet 9-3 and is recovered by the hollow hydraulic feedback pump 9. Therefore, the present invention eliminates the disadvantage of the existing sucker rod unloading device that will cause loss of production, and can increase the production of oil wells.

[0021] The structure of the hollow hydraulic feedback pump 9 is as disclosed in FIG9 (electrically heated heavy oil pumping pump) of SY / T 7083-2016. There are various structures of the hollow hydraulic feedback pump 9, which can be matched with the hollow sucker rod load-reducing pumping device described in the present invention. All hollow hydraulic feedback pumps that produce the same effect as the present invention are within the scope of protection of the present invention.

[0022] The seal between the piston and the pump barrel is in compliance with the requirements of GB / T 17607. The pump diameter refers to the inner diameter of the pump barrel of the oil well pump.

Claims

1. A hollow sucker rod transfer unloading deep pumping device, comprising a hollow hydraulic feedback pump (9), the hollow hydraulic feedback pump (9) mainly comprising two pump barrels with different pump diameters, two plungers matched with the pump barrels, an oil inlet valve, an oil outlet valve and connecting parts, the upper portion of the hollow hydraulic feedback pump (9) having an oil outlet (9-1) and the lower portion having an oil inlet (9-3), further comprising an upper pump barrel (1), an upper hollow piston (2), a reducing pump barrel joint (3), a reducing piston joint (4), a lower pump barrel (5), a lower hollow piston (6), an outer tube (7) and a hollow tube (8), the pump diameter of the upper pump barrel (1) being smaller than the pump diameter of the lower pump barrel (5), the upper pump barrel (1), the reducing pump barrel joint (3) and the lower pump barrel (5) being connected in sequence, the lower portion of the upper hollow piston (2) being connected to the reducing piston joint (4), and the lower hollow piston (6). The upper thread of the plug joint (4) is connected, and the upper part of the hollow tube (8) is connected to the middle thread of the reducing piston joint (4), so that the upper hollow piston (2) is communicated with the hollow tube (8), and the lower thread of the reducing piston joint (4) is connected to the upper part of the lower hollow piston (6), and the upper section (6-1) of the discharge channel is formed between the inner wall of the lower hollow piston (6) and the outer wall of the hollow tube (8). The upper hollow piston (2) penetrates into the upper pump barrel (1), and the lower hollow piston (6) is located in the lower pump barrel (5). The upper hollow piston (2) and the upper pump barrel (1) are sealed together, and the lower hollow piston (6) and the lower pump barrel (5) are sealed together. A breathing chamber (5-1) is formed between the inner walls of the upper hollow piston (2) and the lower pump barrel (5) due to the diameter difference between the two. The upper part of the reducing piston joint (4) is connected to the upper part of the hollow piston (6), and the upper part of the hollow piston (6) is connected to the inner wall of the lower hollow piston (6). There is a connecting groove (4-1), and the breathing chamber (5-1) is connected to the upper section of the leakage channel (6-1) through the connecting groove (4-1), so that the leakage fluid between the upper hollow piston (2) and the upper pump barrel (1) and between the lower hollow piston (6) and the lower pump barrel (5) can flow downward through the interior of the lower hollow piston (6). The lower pump barrel (5) is placed in the outer tube (7), and the lower part of the reducing pump barrel joint (3) is connected to the upper part of the outer tube (7). A vertical flow channel (3-1) is provided on the side wall of the reducing pump barrel joint (3). An annular channel (7-1) is formed between the lower pump barrel (5) and the outer tube (7), and the vertical flow channel (3-1) is connected to the upper part of the annular channel (7-1). The hollow hydraulic feedback pump (9) is sleeved on the hollow tube (8). In addition, the upper part of the fixed part of the hollow hydraulic feedback pump (9) is connected to the lower part of the outer tube (7), the oil outlet (9-1) is communicated with the lower part of the annular channel (7-1), the upper part of the reciprocating part of the hollow hydraulic feedback pump (9) is connected to the lower part of the lower hollow piston (6), and a lower section of the leakage channel (9-2) is provided between the outer wall of the hollow tube (8) and the inner wall of the hollow hydraulic feedback pump (9). The upper end of the lower section of the leakage channel (9-2) is communicated with the upper section of the leakage channel (6-1), and the lower end of the lower section of the leakage channel (9-2) is open and in the same pressure system as the oil inlet (9-3). When the reciprocating part of the hollow hydraulic feedback pump (9) and the lower hollow piston (6) reciprocate synchronously,The well fluid enters the hollow hydraulic feedback pump (9) from the oil inlet (9-3), is pressurized by the hollow hydraulic feedback pump (9), is discharged from the oil outlet (9-1), and then flows out from the vertical flow channel (3-1).

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