Ground supercharged hydraulic pulse device

Abstract

The utility model relates to a ground supercharged hydraulic pulse device, which belongs to the technical field of oil extraction devices and comprises a variable-frequency servo pulse device and a constant-pressure liquid supply device, the variable-frequency servo pulse device comprises a hydraulic oil tank, an oil hydraulic pump, a variable-frequency servo control valve and a power converter, and the constant-pressure liquid supply device comprises a water injection pump and a pressure storage device. The power converter comprises a transmission plunger and a conversion cavity, a hydraulic oil cavity is formed in the middle of the conversion cavity, water cavities are formed in the two ends of the conversion cavity, the pressurization part of the device is quantified, and pressurization and drainage of water are controlled according to hydraulic oil injection. And the hydraulic oil is changed from original circular injection to alternate access, so that the controllability of the pulsation frequency can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ground pressurized water power pulse device belongs to oil extraction device technical field. BACKGROUND

[0002] Oil, as the key energy for industrial development, occupies an indispensable position in the economic process. Improving the oil and gas production of each oilfield has become a top priority. At the same time, with the continuous advancement of oil exploitation, most oilfields have encountered development bottlenecks. Long-term oilfield exploitation has caused oil layer pollution, blockage and other conditions, resulting in a significant decrease in the permeability of the oil layer, and the crude oil production has also been severely affected. How to improve the oil recovery rate in an efficient, economic and safe manner has become the core of solving the problem of oil exploitation.

[0003] In the 1980s, people began to use hydraulic impact to fracture the formation, thereby increasing the permeability of the oil layer and achieving the goal of improving the recovery rate. After years of development, the technology of hydraulic impact fracturing has made significant progress and has been widely used in various oil-producing countries around the world. However, as most oilfields enter the middle and late stages of development, the effect of simply relying on hydraulic impact to improve the permeability of the formation is no longer obvious. In addition, the reservoir properties of each oilfield differ greatly, and most of them belong to unconventional oil and gas reservoirs. Therefore, the traditional hydraulic pulse process is not suitable for different oilfields, and the operation is also more complicated.

[0004] Chinese patent document CN111852432A discloses a ground control hydraulic pulse device, which belongs to an oilfield oil extraction process technology. It includes a variable frequency servo pulse device and a constant pressure liquid supply device. The variable frequency servo pulse device includes a hydraulic oil tank, an oil pressure pump, a variable frequency servo control valve and a power converter. The hydraulic oil tank is connected to the oil pressure pump and the variable frequency servo control valve respectively, and the variable frequency servo control valve is connected to the power converter. The constant pressure liquid supply device includes a water pipeline, a water injection pump and a pressure accumulator. The water injection pump is connected to the water pipeline at one end and to the pressure accumulator at the other end. The pressure accumulator is connected to one end of the power converter. This process uses traditional hydraulic pulse to unblock the oilfield. Under normal circumstances, the water inlet pipeline is difficult to achieve the expected pressure effect under a single accumulator. On this basis, it is more difficult to further improve the pressure. Secondly, in the transmission plunger part, the frequency and amplitude of the pulsation have a large limit, and the device does not accurately quantify the effect. It is difficult to adapt to different oilfield environments. Therefore, it is necessary to design a hydraulic pulse device that can adapt to different oilfield environments, which can effectively avoid the problems of poor applicability and complex operation of the traditional hydraulic pulse process in various oilfields. SUMMARY

[0005] The utility model discloses a ground pressurization type water power pulse device makes improvement to the core part of water power pulse device, makes the controllable quantization to the pulsation amplitude, adjusts the injection of hydraulic oil, and alternately injects, realizes the controllability of frequency.

[0006] The technical scheme of the utility model is as follows:

[0007] A ground pressurization type water power pulse device, including frequency conversion servo pulse device and constant pressure liquid supply device, frequency conversion servo pulse device includes hydraulic oil tank, oil pressure pump, frequency conversion servo control valve and power converter, hydraulic oil tank is connected oil pressure pump and frequency conversion servo control valve respectively, and oil pressure pump is connected to frequency conversion servo control valve, and frequency conversion servo control valve is connected to power converter;

[0008] Constant pressure liquid supply device includes water injection pump and pressure accumulator, and one end of water injection pump is connected water pipeline, and the other end is connected pressure accumulator, and pressure accumulator is connected to one end of power converter, and the two ends of power converter are connected one water injection line respectively, and one water injection line includes water pipeline, water injection pump and pressure accumulator;

[0009] Power converter includes transmission plunger and conversion cavity, and the middle part of conversion cavity is provided with hydraulic oil cavity, and the two ends of conversion cavity are provided with water cavity, and transmission plunger is cross structure, and the center of transmission plunger is middle force plate, and transmission plunger center is arranged in hydraulic oil cavity, and the two ends of transmission plunger are connected to water cavity, and the two ends of water cavity are respectively provided with water inlet a, water inlet b, drainage outlet a and drainage outlet b, and the two ends of water inlet a and water inlet b are connected to pressure accumulator through pipeline respectively, and the two ends of drainage outlet a and drainage outlet b are connected to water injection well through pipeline respectively, and the pipeline of drainage outlet a and drainage outlet b connected to water injection well is provided with drainage check valve, and the pipeline between drainage check valve and water injection well is provided with drainage pressure flow sensor and liquid outlet valve, for gathering the flow pressure and flow information of water injection well drainage;

[0010] The transmission plunger of cross structure divides hydraulic oil cavity into four cavities in hydraulic oil cavity, and the two cavities in the upper part are hydraulic oil injection cavities, and the openings of the two cavities in the upper part are hydraulic oil inlet a and hydraulic oil inlet b respectively, and the two cavities in the lower part are hydraulic oil discharge cavities, and the openings of the two cavities in the lower part are hydraulic oil outlet a and hydraulic oil outlet b, and hydraulic oil inlet a and hydraulic oil outlet a constitute hydraulic oil cavity a on the same side, and hydraulic oil inlet b and hydraulic oil outlet b constitute hydraulic oil cavity b on the same side on the other side, and oil pressure pump is connected with hydraulic oil inlet a, hydraulic oil inlet b, hydraulic oil outlet a and hydraulic oil outlet b through passageway;

[0011] The variable frequency servo control valve and the drainage pressure flow sensor are connected to the remote control computer, so as to conveniently monitor the pressure and flow information in the pipeline and adjust the rotation of the valve core of the variable frequency servo control valve according to the oil field site demand to adjust the frequency of the hydraulic pulse.

[0012] Preferably, the transmission plunger is sealed at both ends, and the water injection cavity and the drainage cavity are connected to ensure that the liquid in the water injection cavity and the drainage cavity is not in communication with the liquid in the hydraulic oil cavity.

[0013] Preferably, a high-pressure air bag is arranged in the pressure accumulator, and the high-pressure air bag is inflated to provide stronger power for water flow, strengthen the impact on the oil layer, and improve the operation effect.

[0014] Further preferably, a pressure gauge is arranged on the pressure accumulator and connected to the high-pressure air bag, so as to conveniently observe the pressure in the high-pressure air bag and adjust the impact force of the hydraulic pulse.

[0015] Preferably, the pressure storage range of the pressure accumulator is 40MPa-150MPa.

[0016] Preferably, a pressure gauge is arranged on the oil pressure pump to conveniently observe the oil pressure.

[0017] Preferably, a water injection check valve is arranged on the pipeline connected to the respective pressure accumulator of the water injection port a and the water injection port b.

[0018] Preferably, the cross-sectional area ratio of the force receiving plate in the middle of the transmission plunger to the force transmission component at both ends of the transmission plunger is 3:1.

[0019] The above ground pressurized hydraulic pulse device is used for control, and the operation steps are as follows:

[0020] (1) Open the water pipeline, and pump the water into the pressure accumulator, and the high-pressure air bag is compressed to complete the pressure storage;

[0021] (2) Start the oil pressure pump, rotate the valve core of the variable frequency servo control valve, pump the liquid in the hydraulic oil tank into the hydraulic oil inlet a through the passage, drive the transmission plunger to move to one end, and the water injection port b and the drainage port b form an open circuit; the liquid at the drainage port b is extruded into the water injection well by the transmission plunger, at this time, the water injection port a is hollow, the pipelines at the upper and lower ends of the water injection port a and the drainage port a form a passage, the liquid in the pressure accumulator connected to the water injection port a is extruded by the inflation of the high-pressure air bag and quickly injected into the water injection well through the water injection port a and the drainage port a, to impact and fracture the stratum and remove the blockage of the oil layer;

[0022] (3) variable frequency servo control valve core rotates again, the liquid in the oil pump enters the hydraulic oil cavity b through the hydraulic oil inlet b and pushes the transmission plunger to move to the other end, at this time the liquid in the hydraulic oil cavity a returns to the hydraulic oil tank through the channel formed by extrusion, the water inlet a and the water outlet a are extruded by the transmission plunger to form an open circuit, the pressure accumulator connected to the water inlet a continues to pressurize, the water inlet b and the water outlet b are empty, and the liquid in the pressure accumulator connected to the water inlet b is extruded by the high-pressure air bag and quickly injected into the injection well through the water inlet b and the water outlet b;

[0023] (4) the operation steps 2 and 3 are cycled, and the formation is continuously fractured by using hydraulic pulse to remove the oil layer blockage.

[0024] The present application makes appropriate improvements and optimizations on the existing problems. First, the pressure increasing part of the device is quantized: according to the hydraulic oil injection control water pressure increasing and removal. The hydraulic oil is improved from the original circulating injection to alternating in and out, which can realize the controllability of the pulse frequency.

[0025] The beneficial effects of the present application are as follows:

[0026] 1. The device is placed on the ground, and the operation, maintenance and detection are convenient and fast in the field application construction, and the frequency of the hydraulic pulse can be efficiently adjusted to adapt to different oil field environments.

[0027] 2. The hydraulic oil tank is innovated, and the activity plunger and the hydraulic oil injection are adjusted to quantize the pulse amplitude.

[0028] 3. The device uses a remote control computer to monitor the pressure and flow of the liquid injected into the injection well and the liquid discharged from the injection well in real time, adjusts the rotation of the valve core through the feedback of the flow and the pressure, and changes the frequency change of the hydraulic pulse.

[0029] 4. The pressure storage range of the pressure accumulator is large, and the applicability in various oil fields is good.

[0030] 5. The device has the advantages of simple structure, reasonable design, convenient installation and use, safe and reliable working performance, good use effect, etc. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 It is a structural schematic view of the present application;

[0032] Fig. 2 It is a schematic view of the activity plunger region of the present application;

[0033] Wherein: 1, water pipeline; 2, water injection pump; 3, hydraulic oil tank; 4, pressure gauge; 5, pressure accumulator; 6, high-pressure air bag; 7, drain a; 8, water injection port a; 9 hydraulic oil cavity a; 10, power converter; 11, transmission plunger; 12, pressure gauge; 13, oil pump; 14, hydraulic oil cavity b; 15, water injection check valve; 16, water injection port b; 17, drain b; 18, remote control computer; 19, variable frequency servo control valve; 20, drain check valve; 21, hydraulic oil outlet b; 22, wellhead device; 23, water injection well; 24, liquid outlet valve; 25, hydraulic oil outlet a; 26, drainage pressure flow sensor; 27, hydraulic oil inlet b, 28, hydraulic oil inlet a; 29, transmission plunger middle force plate; 30, transmission plunger both ends force component. DETAILED DESCRIPTION

[0034] The utility model is further described below by examples and in conjunction with the drawings, but is not limited thereto.

[0035] Example 1:

[0036] A ground pressurized hydraulic pulse device, as shown in Figs. 1-2 The variable frequency servo pulse device includes a hydraulic oil tank 3, an oil pump 13, a variable frequency servo control valve 19 and a power converter 10. The hydraulic oil tank 3 is connected to the oil pump 13 and the variable frequency servo control valve 19 respectively. The oil pump 13 is connected to the variable frequency servo control valve 19. The variable frequency servo control valve 19 is connected to the power converter 10.

[0037] The constant pressure liquid supply device includes a water injection pump 2 and a pressure accumulator 5. One end of the water injection pump 2 is connected to the water pipeline 1. The other end of the water injection pump 2 is connected to the pressure accumulator 5. The pressure accumulator 5 is connected to one end of the power converter 10. The power converter 10 has two ends, each of which is connected to one water injection line. One water injection line includes a water pipeline, a water injection pump, a pressure accumulator and a water injection check valve.

[0038] The power converter 10 comprises a transmission plunger 11 and a conversion cavity, a hydraulic oil cavity is arranged in the middle of the conversion cavity, water cavities are arranged at both ends of the conversion cavity, the transmission plunger is a cross structure, the center of the transmission plunger is a middle stress plate, the two ends of the transmission plunger are transmission plunger end force components, the center of the transmission plunger is arranged in the hydraulic oil cavity, the two ends of the transmission plunger are connected to the water cavities, the water cavities at the two ends are respectively provided with water injection ports a 8 and b 16, water discharge ports a 7 and b 17, the water injection ports a and b at the two ends are respectively connected to pressure accumulators through pipelines, and the water discharge ports a and b at the two ends are respectively connected to water injection wells through pipelines, the pipelines connected to the pressure accumulators of the water injection ports a and b are respectively provided with water injection check valves 15, and the pipelines connected to the water injection wells of the water discharge ports a and b are respectively provided with water discharge check valves 20, a water discharge pressure flow sensor 26 and a liquid outlet valve 24 are arranged on the pipelines between the water discharge check valves and the water injection wells 23, and the water discharge pressure flow sensor and the liquid outlet valve are used to collect the water flow pressure and flow information discharged from the water injection wells.

[0039] The transmission plunger with a cross structure divides the hydraulic oil cavity into four cavities, the upper two cavities are hydraulic oil injection cavities, the openings of the upper two cavities are hydraulic oil inlets a 28 and b 27 respectively, the lower two cavities are hydraulic oil discharge cavities, the openings of the lower two cavities are hydraulic oil outlets a 25 and b 21 respectively, the hydraulic oil inlet a and the hydraulic oil outlet a constitute a hydraulic oil cavity a 9 on the same side, the hydraulic oil inlet b and the hydraulic oil outlet b constitute a hydraulic oil cavity b 14 on the same side on the other side, and an oil pump is connected with the hydraulic oil inlets a, b, outlets a and b through passages.

[0040] The variable frequency servo control valve 19 and the water discharge pressure flow sensor 26 are connected to a remote control computer 18, so that the pressure and flow information in the pipelines can be monitored conveniently, and the rotation of the valve core of the variable frequency servo control valve can be adjusted according to the requirements of the oil field site, so that the frequency of the hydraulic pulse can be adjusted.

[0041] The connection positions of the two ends of the transmission plunger with the water injection cavities and the water discharge cavities are sealed, so that the liquids in the water injection cavities and the water discharge cavities cannot flow into the hydraulic oil cavity.

[0042] A high-pressure air bag 6 is arranged in the pressure accumulator 5, the expansion of the high-pressure air bag provides stronger power for the water flow, strengthens the impact on the oil layer, and improves the operation effect. The pressure storage range of the pressure accumulator is 40MPa-150MPa.

[0043] The above ground pressurized hydraulic pulse device is controlled, and the operation steps are as follows:

[0044] (1) Assemble the water injection well, wellhead device and the above ground pressurized hydraulic pulse device, open the water inflow pipeline, pump the water flow into the pressure accumulator, and complete the pressure storage by compressing the high-pressure air bag by the liquid;

[0045] (2) Start the oil pump, the valve core of the variable frequency servo control valve rotates, the oil pump pumps the liquid in the hydraulic oil tank into the hydraulic oil inlet a through the passage, drives the transmission plunger to move to one end, and the water inlet b and the water outlet b form an open circuit; The liquid at the water outlet b is extruded into the injection well by the transmission plunger, at this time the hollow water inlet a, the upper and lower pipelines of the water inlet a and the water outlet a form a passage, the liquid in the pressure reservoir connected to the water inlet a is extruded by the expansion of the high-pressure air bag and quickly injected into the injection well through the water inlet a and the water outlet a, impacting and fracturing the formation, and removing the blockage of the oil layer;

[0046] (3) The valve core of the variable frequency servo control valve rotates again, the liquid in the oil pump enters the hydraulic oil cavity b through the hydraulic oil inlet b, drives the transmission plunger to move to the other end, at this time the liquid in the hydraulic oil cavity a returns to the hydraulic oil tank through the passage formed by extrusion, the water inlet a and the water outlet a are extruded by the transmission plunger to form an open circuit, the pressure reservoir connected to the water inlet a continues to be pressurized, the water inlet b and the water outlet b are hollow, and the liquid in the pressure reservoir connected to the water inlet b is extruded by the expansion of the high-pressure air bag and quickly injected into the injection well through the water inlet b and the water outlet b;

[0047] (4) The operation steps 2 and 3 are cycled, and the formation is continuously fractured by using hydraulic pulse to remove the blockage of the oil layer.

[0048] The present application makes appropriate improvements and optimizations to the existing problems. First, the pressure part of the device is quantified: according to the injection of hydraulic oil to control the pressure and removal of water. The hydraulic oil is improved from the original circulating injection to alternating in and out, which can realize the controllability of the pulse frequency.

[0049] Example 2:

[0050] A ground pressure type hydraulic pulse device, the structure is as described in Example 1, the difference is that a pressure gauge 4 is arranged on the pressure reservoir 5, the pressure gauge 4 is connected to the high-pressure air bag 6, which facilitates observation of the pressure in the high-pressure air bag and adjustment of the impact force of the hydraulic pulse.

[0051] Example 3:

[0052] A ground pressure type hydraulic pulse device, the structure is as described in Example 1, the difference is that a pressure gauge 12 is arranged on the oil pump 13, which facilitates observation of the oil pressure.

[0053] Example 4:

[0054] A ground pressure type hydraulic pulse device, the structure is as described in Example 1, the difference is that the cross-sectional area ratio of the force plate 29 in the middle of the transmission plunger to the force transmission part 30 at both ends of the transmission plunger is 3:1.

Claims

1. A ground plenum type hydraulic pulsing device, characterized by, The variable frequency servo pulse device comprises a hydraulic oil tank, an oil pressure pump, a variable frequency servo control valve and a power converter, the hydraulic oil tank is connected to the oil pressure pump and the variable frequency servo control valve respectively, the oil pressure pump is connected to the variable frequency servo control valve, and the variable frequency servo control valve is connected to the power converter. The constant pressure liquid supply device comprises a water injection pump and a pressure accumulator, one end of the water injection pump is connected to a water inlet pipeline, the other end is connected to the pressure accumulator, and the pressure accumulator is connected to one end of the power converter. The power converter comprises a transmission plunger and a conversion cavity, a hydraulic oil cavity is arranged in the middle of the conversion cavity, water cavities are arranged at both ends of the conversion cavity, the transmission plunger has a cross structure, a middle stress plate is arranged at the center of the transmission plunger, the transmission plunger is arranged in the hydraulic oil cavity, the transmission plunger is connected to the water cavities at both ends, water inlet a, water inlet b, water outlet a and water outlet b are arranged in the water cavities at both ends, water inlet a and water inlet b at both ends are connected to the pressure accumulator through pipelines, water outlet a and water outlet b at both ends are connected to a water injection well through pipelines, a water drainage one-way valve is arranged on the pipeline connected to the water injection well, a water drainage pressure flow sensor and a liquid outlet valve are arranged on the pipeline between the water drainage one-way valve and the water injection well. The transmission plunger with the cross structure divides the hydraulic oil cavity into four cavities, the upper two cavities are hydraulic oil injection cavities, and the openings of the upper two cavities are hydraulic oil inlet a and hydraulic oil inlet b. The lower two cavities are hydraulic oil discharge cavities, and the openings of the lower two cavities are hydraulic oil outlet a and hydraulic oil outlet b; hydraulic oil inlet a and hydraulic oil outlet a constitute hydraulic oil cavity a on the same side, and hydraulic oil inlet b and hydraulic oil outlet b constitute hydraulic oil cavity b on the other side; the oil pressure pump is connected to hydraulic oil inlet a, hydraulic oil inlet b, hydraulic oil outlet a and hydraulic oil outlet b through a passage. The variable frequency servo control valve and the water drainage pressure flow sensor are connected to a remote control computer.

2. The floor plenum hydropulsive device of claim 1, wherein, The connection between the transmission plunger and the water injection cavity and the water drainage cavity at both ends is sealed.

3. The floor plenum hydropulsive pulse apparatus of claim 1, wherein, A high-pressure air bag is arranged in the pressure accumulator.

4. The floor plenum hydropulsive device of claim 3, wherein, A pressure gauge is arranged on the pressure accumulator and connected to the high-pressure air bag.

5. The floor plenum hydropulsor device of claim 1, wherein The pressure storage range of the pressure accumulator is 40MPa-150MPa.

6. The floor plenum hydropulsive pulse apparatus of claim 1, wherein, A pressure gauge is arranged on the oil pressure pump.

7. The floor plenum hydropulsive pulse apparatus of claim 1, wherein, Water inlet a and water inlet b are connected to the pipelines of the respective pressure accumulators, and water inlet one-way valves are arranged on the pipelines.

8. The floor plenum hydropulsive pulse apparatus of claim 1, wherein, The cross section area ratio of the middle stress plate of the transmission plunger to the force transmission components at both ends of the transmission plunger is 3:1.

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