A high-efficiency lifting method and pipe string for deep oil and gas reservoirs with graded pumping assistance

Abstract

The present invention discloses a high-efficiency lifting method and pipe string for graded pumping assistance in deep oil and gas reservoirs. The method includes the following steps: collecting early production data of oil wells and corresponding water well data, analyzing oil-water connectivity, analyzing the viscosity, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir; selecting an appropriate vibrator according to the analysis results of the reservoir; selecting a suitable oil pipe according to the fluid analysis characteristics; designing the spacing between two or more pumping aids according to the pump depth and fluid characteristics; constructing according to the design results, first lowering the pipe string, and then testing the pressure of the pipe string. After the pressure test is qualified, lower the sucker rod to connect the liquid lifting pump, and conduct normal production after the test pumping and holding pressure is qualified. According to the reservoir characteristics, optimizing the application of matching vibrators can improve the seepage capacity of the reservoir and play a role in rapid oil production; optimizing the distribution of the pumping aid device according to the fluid characteristics.

Description

Technical Field

[0001] The invention relates to the technical field of oil production equipment, in particular to a high-efficiency lifting method and a pipe column for staged pumping assistance in deep oil and gas reservoirs. Background Art

[0002] Low permeability oil wells have the characteristics of low reservoir permeability and deep burial depth. These oil wells are contaminated by mud during drilling and blocked by solid particles during well washing operations, with low reservoir output. Conventional unblocking technology is difficult to remove the blockage. In addition, the pump hangs deep, the rod stroke loss is large; the fluid contains gas, and the pump barrel is low in filling, which affects the lifting efficiency.

[0003] Preliminary research has resulted in a deep well rod pump efficiency improvement device and oil production equipment using it ZL201720603718.9. This technology can improve the liquid lifting capacity of the tubing string and achieve liquid lifting and efficiency enhancement, but it cannot remove the particle blockage in low-permeability oil reservoirs; an oilfield oil and water well leak isolation and plugging production integrated tubing string ZL201320320476.4 can remove formation blockage and increase oil well production capacity, but the construction process is complicated.

[0004] Application number: 201720603718.9, application date: 2017-05-26. A deep well pump rod pump efficiency improvement device is disclosed, including a core shaft, an outer cylinder and a coupling. The first end of the core shaft is connected to the coupling. The outer cylinder can be slidably mounted on the core shaft. A flow channel is formed between the core shaft and the outer cylinder. A flow hole is provided on the outer cylinder. When the outer cylinder slides to a first position relative to the core shaft, the flow hole is connected to the flow channel. When the outer cylinder slides to a second position, the flow hole is disconnected from the flow channel. The deep well pump rod pump efficiency improvement device helps the oil pump to pump oil, improves pump efficiency, reduces the pressure difference at the upper end of the oil pump plunger, and increases service life; straightens the sucker rod, reduces the friction between the sucker rod and the oil pipe; and extends the overall service life of the downhole pumping equipment. The present invention also discloses an oil production equipment using the deep well pump rod pump efficiency improvement device.

[0005] Application number: 201320320476.4 Application date: 2013-06-05 An integrated pipe string for leak isolation, unblocking and production of oil and water wells in oil fields belongs to the field of oil extraction technology. The oil pipe is connected to a pumping aid device, the other end of the pumping aid device is connected to a packer, the other end of the packer is connected to a constant pressure check valve, the other end of the constant pressure check valve is connected to an oil pipe short section, and the other end of the oil pipe short section is connected to a bell mouth. After the use of the present invention, one trip of the pipe string can achieve the three purposes of leak isolation, unblocking and production, which shortens the construction period by half compared with the original process, reduces the construction cost of a single well, and has broad promotion value for similar well construction at home and abroad.

[0006] Application number: 201820023405.0, application date: 2018-01-08 A dual-wave vibration oil extraction device, including an outer looper, an inner looper, a rifling shaft, a high-frequency rotary vibrator, a low-frequency rotary vibrator and a screen tube, wherein the upper end of the outer looper is connected to the oil pipe of the oil tree, the inner looper is slidably installed in the outer looper, and the screen tube is fixed at the bottom of the inner looper; the rifling shaft is arranged in the inner holes of the outer looper, the inner looper and the screen tube, the top end of the rifling shaft is fixedly connected to the oil pipe, and the part of the rifling shaft located in the inner hole of the screen tube is installed with a high-frequency rotary vibrator and a low-frequency rotary vibrator. Installed underground, it has the dual-wave function of sound waves and infrasound waves, is suitable for unblocking near the wellbore and acts on the entire oil layer to improve the rheology of crude oil, reduce the oil-water two-phase interfacial tension, and can play a multi-faceted role in unblocking, increasing production and preventing.

[0007] Application number: 201320637634.9, application date: 2013-10-06 relates to a new type of vibration oil production device, and its technical solution is: including a central shaft, a sleeve, a slider, a lifting short section, a vibrating rod, a water hole, and a jet hole. The sleeve is fixed on the central shaft by a threaded connection. A slider is provided on the outside of the central shaft, and the slider can slide up and down along the central shaft. The lifting short section connects the vibrating rod and the central shaft. The upper part of the central shaft is provided with a water hole, and the lower part of the central shaft is provided with a jet hole. The beneficial effect of the present invention is that the vibration oil production device uses vibration waves with different vibration parameters to treat the oil layer, causing a certain degree of change in the physical and chemical properties of the oil layer and the fluid contained therein, thereby improving the seepage condition of the fluid in the oil layer and increasing the production of the oil well.

[0008] Application number: 201710198960.7, application date: 2017-03-29, relates to a device for improving oil recovery rate by hydraulic low-frequency vibration and its application, including: a power system including a power source for driving the rotor system to rotate; the rotor system including a vertical rotating tube and a horizontal turntable arranged at the bottom of the vertical rotating tube, a flow channel is arranged at the bottom of the vertical rotating tube and on the horizontal turntable, and the vertical rotating tube can be used for the flow of liquid medium; the vibration system includes a vertical separation pipe column and an annular weight arranged in the vertical separation pipe column, and the annular weight can move up and down under the pressure of the liquid medium; a flow channel is arranged at the bottom of the stator system, which can be connected with the flow channel on the horizontal turntable for the discharge of the liquid medium. The vibration frequency of the present invention can be controlled by the motor speed, and the vibration power is controlled by the pressure of the ground pumped liquid, and the two are independently controlled and do not interfere with each other; in addition, it can be placed in the wellbore with the help of the original oil pipe, and there is no need to clean the pipe column, which can directly act on the formation to be treated and facilitate subsequent production.

[0009] Application number: 201721910570.X, application date: 2017-12-30. An ultrasonic oscillator for preventing wax deposition in oil field production pipes is provided, comprising a tubular shell, wherein a jet generator is built in the tubular shell, wherein the jet generator comprises an oil inlet section and an oil outlet section, wherein the oil inlet section is formed by a first constriction and a second constriction transitionally connected with a filter section, and the oil outlet section extends to a column bracket, wherein two vibrating springs are symmetrically mounted on the column bracket, which can effectively prevent wax deposition in the production pipes, prolong the continuous use time of the pipes, and thus improve the production efficiency of the oil field.

[0010] The technical solutions, technical problems to be solved and beneficial effects produced by the above-disclosed technologies are all different from the present invention. Regarding more technical features, technical problems to be solved and beneficial effects of the present invention, there is no technical inspiration in the above-disclosed technical documents. Summary of the invention

[0011] The purpose of the present invention is to provide a high-efficiency lifting method and pipe string for graded pumping in deep oil and gas reservoirs. According to the reservoir characteristics, the matched vibrator is optimized and applied to improve the seepage capacity of the reservoir and play a role in rapid oil production; according to the fluid characteristics, the distribution of the pumping device is optimized. The outer diameter of the pumping device is close to the inner diameter of the oil pipe, and the two are gap-sealed. When the rod column goes up, the gap leakage is less than the volume released by the pumping device; according to the characteristics of different fluids, the pumping device has different optimized spacing.

[0012] In order to achieve the above object, the present invention adopts the following technical scheme, a high-efficiency lifting method for deep oil and gas reservoirs by staged pumping assistance, comprising the following steps:

[0013] The first step is to collect the early production data of the oil wells and the corresponding water well data, analyze the oil-water connectivity, and analyze the density, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir;

[0014] The second step is to select a suitable vibrator according to the reservoir analysis results;

[0015] The third step is to select the appropriate oil pipe according to the fluid analysis characteristics;

[0016] The fourth step is to design the spacing between two or more pumping aids according to the pump depth and fluid characteristics;

[0017] The fifth step is to carry out construction according to the design results. First, the tubing string is lowered, and then the tubing string is pressure tested. After the pressure test is qualified, the sucker rod is lowered to connect the liquid lifting pump. After the pressure test is qualified, normal production can be carried out.

[0018] Furthermore, in the second step, the power of the vibrator is proportional to the thickness of the oil in the reservoir. Thick oil corresponds to a high-power vibrator, and thin oil corresponds to a low-power vibrator.

[0019] Furthermore, in the second step, the power of the vibrator is proportional to the sand content of the oil in the reservoir. The oil layer with high sand content corresponds to a high-power vibrator, and the oil layer with low sand content corresponds to a low-power vibrator.

[0020] Furthermore, in the third step, anti-corrosion oil pipes are used in corroded oil wells; hydrogen sulfide-resistant oil pipes are used in hydrogen sulfide-containing oil wells; and high-insulation gel-lined oil pipes are used in oil wells with a lot of wax deposition to reduce heat loss, keep the fluid temperature above the wax precipitation point, reduce wax cleaning costs, and reduce suspension point loads.

[0021] Furthermore, in the fourth step, the distribution of the pumping aids is optimized according to the gas content of the fluid, the viscosity of the crude oil, and the water content, that is, the greater the gas content, the greater the spacing between the pumping aids, and the smaller the gas content, the smaller the spacing between the pumping aids; the greater the viscosity of the crude oil, the smaller the spacing between the pumping aids, and the smaller the viscosity of the crude oil, the greater the spacing between the pumping aids; the greater the water content, the greater the spacing between the pumping aids, and the smaller the water content, the smaller the spacing between the pumping aids.

[0022] Furthermore, in the fifth step, the pipe string includes a tail pipe, a vibrator, a liquid lifting pump, a pumping aid, and a liquid lifting pipe connected in sequence from bottom to top, and the upper end of the liquid lifting pump is connected to a sucker rod.

[0023] Furthermore, the vibrator is facing the reservoir, and a matching vibrator is applied according to the amount of oil in the oil well. By utilizing the expansion and contraction of the pipe string, the vibrator can generate continuous vibration to relieve the blockage of the reservoir.

[0024] Furthermore, the vibrator has slits or holes that can generate throttling. When the fluid passes through, the fluid flows at a variable speed and generates sound waves, which act on the oil layer, discharge free sand or loosely consolidated sand from the formation, and delay the generation of scale in the blasthole.

[0025] Furthermore, when the rod column moves upward, the pumping aid can be closed under the action of pressure and friction to lift the fluid; when the rod column moves downward, the pumping aid is opened and the fluid can freely pass through the pumping aid.

[0026] Furthermore, the outer diameter of the pumping aid and the inner diameter of the oil pipe form a gap seal, and when the rod string goes up, the gap leakage is smaller than the volume released by the pumping aid; according to the characteristics of different fluids, the pumping aid has different optimized spacings.

[0027] Furthermore, the liquid lifting pump is an oil pump with a sliding valve and a double-layer tube capable of suspending a long tail pipe.

[0028] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme, a high-efficiency lifting string for graded assisted pumping in deep oil and gas reservoirs, comprising a tail pipe, a vibrator, a liquid lifting pump, a pumping aid, and a liquid lifting pipe connected in sequence from bottom to top, and the upper end of the liquid lifting pump is connected to a sucker rod.

[0029] Furthermore, the vibrator has slits or holes that can generate throttling. When the fluid passes through, the fluid flows at a variable speed and generates sound waves, which act on the oil layer, discharge free sand or loosely consolidated sand from the formation, and delay the generation of scale in the blasthole.

[0030] Furthermore, when the rod column moves upward, the pumping aid can be closed under the action of pressure and friction to lift the fluid; when the rod column moves downward, the pumping aid is opened and the fluid can freely pass through the pumping aid.

[0031] Furthermore, the outer diameter of the pumping aid and the inner diameter of the oil pipe form a gap seal, and when the rod string moves upward, the gap leakage is smaller than the volume released by the pumping aid.

[0032] Furthermore, the liquid lifting pump is an oil pump with a sliding valve and a double-layer tube capable of suspending a long tail pipe.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] According to the logging data of the oil well, the reservoir energy and the remaining oil are analyzed, and in combination with the fluid characteristics of the oil well and the wellbore structure, a long-term liquid-lifting and efficiency-enhancing tubing string of suitable size and length for low-permeability oil reservoirs, that is, the high-efficiency lifting tubing string for graded pumping assistance in deep oil and gas reservoirs of the present invention, is used to drain the liquid; the tail pipe is deepened to the middle of the oil layer, and the movement of the tubing string and the flow characteristics of the fluid generate vibrations near the oil layer, which promote the vibration and discharge of free mud and sand in the reservoir, and delay the formation of scale in the blasthole; the pumping aid on the pump divides the pressure in the oil pipe, and the gas expands, which can disperse the wax core and delay the formation of wax; the gas content in the oil pipe is increased, and throttling vibration occurs when passing through the pumping aid, thereby delaying the deposition of scale in the oil pipe.

[0035] Consider the reservoir properties of the oil well, optimize the lifting string, use anti-corrosion strings in corrosive oil wells; use hydrogen sulfide-resistant strings in hydrogen sulfide-containing oil wells to extend the lifting life;

[0036] According to the reservoir characteristics, the optimized application of matching vibrators can improve the reservoir's seepage capacity and play a role in rapid oil production; the vibrator is facing the reservoir, and according to the amount of oil in the oil well, a matching vibrator is applied. By using the expansion and contraction of the pipe string, the vibrator can generate continuous vibration to remove the reservoir blockage;

[0037] The vibrator has slits or holes that can produce throttling. When the fluid passes through, the fluid flows at a variable speed and generates sound waves, which can act on the oil layer to discharge free sand or loosely consolidated sand from the formation and delay the formation of scale in the blasthole.

[0038] According to the fluid characteristics, the distribution of the pumping device is optimized. When the pumping device moves upward, it can be closed under the action of pressure and friction to lift the fluid; when it moves downward, the pumping device opens and the fluid can freely pass through the pumping device;

[0039] The outer diameter of the pumping aid is close to the inner diameter of the oil pipe, and the two are gap-sealed. When the rod string moves upward, the gap leakage is smaller than the volume released by the pumping aid. According to the characteristics of different fluids, the pumping aid has different optimized spacings.

[0040] The liquid lifting pump is an oil pump with a sliding valve, a double-layer pipe and a long tail pipe.

[0041] When the liquid lifting pump is in the down stroke, the plunger stroke loss can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The present invention is a structural schematic diagram of a high-efficiency lifting string for graded pumping assistance in deep oil and gas reservoirs.

[0043] In the figure: 1 tail pipe, 2 vibrator, 3 liquid lifting pump, 4 liquid lifting pipe, 5 pumping aid, 6 sucker rod. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Embodiment 1:

[0046] See also Figure 1 The present invention provides a technical solution: a high-efficiency lifting method for deep oil and gas reservoirs by assisted pumping, comprising the following steps:

[0047] The first step is to collect the early production data of the oil wells and the corresponding water well data, analyze the oil-water connectivity, and analyze the density, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir;

[0048] The second step is to select a suitable vibrator according to the reservoir analysis results;

[0049] The third step is to select the appropriate oil pipe according to the fluid analysis characteristics;

[0050] The fourth step is to design the spacing between two or more pumping aids according to the pump depth and fluid characteristics;

[0051] The fifth step is to carry out construction according to the design results. First, the tubing string is lowered, and then the tubing string is pressure tested. After the pressure test is qualified, the sucker rod is lowered to connect the liquid lifting pump. After the pressure test is qualified, normal production can be carried out.

[0052] Furthermore, in the second step, the power of the vibrator is proportional to the thickness of the oil in the reservoir. Thick oil corresponds to a high-power vibrator, and thin oil corresponds to a low-power vibrator.

[0053] Furthermore, in the second step, the power of the vibrator is proportional to the sand content of the oil in the reservoir. The oil layer with high sand content corresponds to a high-power vibrator, and the oil layer with low sand content corresponds to a low-power vibrator.

[0054] Furthermore, in the third step, anti-corrosion oil pipes are used in corroded oil wells; hydrogen sulfide-resistant oil pipes are used in hydrogen sulfide-containing oil wells; and high-insulation gel-lined oil pipes are used in oil wells with a lot of wax deposition to reduce heat loss, keep the fluid temperature above the wax precipitation point, reduce wax cleaning costs, and reduce hanging point loads. The oil pipes mentioned here, in the present invention, refer to tail pipes and liquid lifting pipes.

[0055] Furthermore, in the fourth step, the distribution of the pumping aids is optimized according to the gas content of the fluid, the viscosity of the crude oil, and the water content, that is, the greater the gas content, the greater the spacing between the pumping aids, and the smaller the gas content, the smaller the spacing between the pumping aids; the greater the viscosity of the crude oil, the smaller the spacing between the pumping aids, and the smaller the viscosity of the crude oil, the greater the spacing between the pumping aids; the greater the water content, the greater the spacing between the pumping aids, and the smaller the water content, the smaller the spacing between the pumping aids.

[0056] Furthermore, in the fifth step, the pipe string includes a tail pipe 1, a vibrator 2, a liquid lifting pump 3, a pumping aid 5, and a liquid lifting pipe 4 connected in sequence from bottom to top, and the upper end of the liquid lifting pump is connected to a sucker rod 6.

[0057] Furthermore, the vibrator is facing the reservoir, and a matching vibrator is applied according to the amount of oil in the oil well. By utilizing the expansion and contraction of the pipe string, the vibrator can generate continuous vibration to relieve the blockage of the reservoir.

[0058] Furthermore, the vibrator has slits or holes that can generate throttling. When the fluid passes through, the fluid flows at a variable speed and generates sound waves, which act on the oil layer, discharge free sand or loosely consolidated sand from the formation, and delay the generation of scale in the blasthole.

[0059] Furthermore, when the rod column moves upward, the pumping aid can be closed under the action of pressure and friction to lift the fluid; when the rod column moves downward, the pumping aid is opened and the fluid can freely pass through the pumping aid.

[0060] Furthermore, the outer diameter of the pumping aid and the inner diameter of the oil pipe form a gap seal, and when the rod string goes up, the gap leakage is smaller than the volume released by the pumping aid; according to the characteristics of different fluids, the pumping aid has different optimized spacings.

[0061] Furthermore, the liquid lifting pump is an oil pump with a sliding valve and a double-layer tube capable of suspending a long tail pipe.

[0062] A high-efficiency lifting pipe string for graded pumping assistance in deep oil and gas reservoirs comprises a tail pipe, a vibrator, a liquid lifting pump, a pumping assistant and a liquid lifting pipe which are sequentially connected from bottom to top, wherein the upper end of the liquid lifting pump is connected to a sucker rod.

[0063] Furthermore, the vibrator has slits or holes that can generate throttling. When the fluid passes through, the fluid flows at a variable speed and generates sound waves, which act on the oil layer, discharge free sand or loosely consolidated sand from the formation, and delay the generation of scale in the blasthole.

[0064] Furthermore, when the rod column moves upward, the pumping aid can be closed under the action of pressure and friction to lift the fluid; when the rod column moves downward, the pumping aid is opened and the fluid can freely pass through the pumping aid.

[0065] Furthermore, the outer diameter of the pumping aid and the inner diameter of the oil pipe form a gap seal, and when the rod string moves upward, the gap leakage is smaller than the volume released by the pumping aid.

[0066] Furthermore, the liquid lifting pump is an oil pump with a sliding valve and a double-layer tube capable of suspending a long tail pipe.

[0067] According to the logging data of the oil well, the reservoir energy and the remaining oil are analyzed, and in combination with the fluid characteristics of the oil well and the wellbore structure, a long-term liquid-lifting and efficiency-enhancing tubing string of suitable size and length for low-permeability oil reservoirs, that is, the high-efficiency lifting tubing string for graded pumping assistance in deep oil and gas reservoirs of the present invention, is used to drain the liquid; the tail pipe is deepened to the middle of the oil layer, and the movement of the tubing string and the flow characteristics of the fluid generate vibrations near the oil layer, which promote the vibration and discharge of free mud and sand in the reservoir, and delay the formation of scale in the blasthole; the pumping aid on the pump divides the pressure in the oil pipe, and the gas expands, which can disperse the wax core and delay the formation of wax; the gas content in the oil pipe is increased, and throttling vibration occurs when passing through the pumping aid, thereby delaying the deposition of scale in the oil pipe.

[0068] Consider the reservoir properties of the oil well, optimize the lifting string, use anti-corrosion strings in corrosive oil wells; use hydrogen sulfide-resistant strings in hydrogen sulfide-containing oil wells to extend the lifting life;

[0069] According to the reservoir characteristics, the optimized application of matching vibrators can improve the reservoir's seepage capacity and play a role in rapid oil production; the vibrator is facing the reservoir, and according to the amount of oil in the oil well, a matching vibrator is applied. By using the expansion and contraction of the pipe string, the vibrator can generate continuous vibration to remove the reservoir blockage;

[0070] The vibrator has slits or holes that can produce throttling. When the fluid passes through, the fluid flows at a variable speed and generates sound waves, which can act on the oil layer to discharge free sand or loosely consolidated sand from the formation and delay the formation of scale in the blasthole.

[0071] According to the fluid characteristics, the distribution of the pumping device is optimized. When the pumping device moves upward, it can be closed under the action of pressure and friction to lift the fluid; when it moves downward, the pumping device opens and the fluid can freely pass through the pumping device;

[0072] The outer diameter of the pumping aid is close to the inner diameter of the oil pipe, and the two are gap-sealed. When the rod string moves upward, the gap leakage is smaller than the volume released by the pumping aid. According to the characteristics of different fluids, the pumping aid has different optimized spacings.

[0073] The liquid lifting pump is an oil pump with a sliding valve, a double-layer pipe and a long tail pipe.

[0074] The lifting pump can reduce the plunger stroke loss during the downstroke. During the downstroke, the slide valve is closed and the plunger continues to move downward. Due to the high compressibility of the fluid in deep low-permeability oil wells, when the plunger moves downward, the chamber pressure between the upper part of the plunger and the slide valve decreases. When the fluid pressure below the plunger is higher than the pressure between the plunger and the slide valve, the valve ball opens. However, at this time, the pressure below the slide valve is much lower than the pressure above the slide valve. The buoyancy acting on the bottom of the sucker rod connected to the plunger is greatly reduced compared with conventional processes. Therefore, the rod column length during the downstroke is greater than that of conventional processes, and the rod column stroke loss during the downstroke is reduced. During the upstroke, compared with conventional processes, the rod column length is consistent with the same pump diameter. Therefore, the graded assisted pumping and high-efficiency lifting method can effectively reduce stroke losses and improve pump efficiency.

[0075] Embodiment 2:

[0076] See also Figure 1 The present invention provides a technical solution: a high-efficiency lifting method for deep oil and gas reservoirs by assisted pumping, comprising the following steps:

[0077] The first step is to collect the early production data of the oil wells and the corresponding water well data, analyze the oil-water connectivity, and analyze the density, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir;

[0078] The second step is to select a suitable vibrator according to the reservoir analysis results;

[0079] The third step is to select the appropriate oil pipe according to the fluid analysis characteristics;

[0080] The fourth step is to design the spacing between two or more pumping aids according to the pump depth and fluid characteristics;

[0081] The fifth step is to carry out construction according to the design results. First, the tubing string is lowered, and then the tubing string is pressure tested. After the pressure test is qualified, the sucker rod is lowered to connect the liquid lifting pump. After the pressure test is qualified, normal production can be carried out.

[0082] Furthermore, in the second step, the power of the vibrator is proportional to the thickness of the oil in the reservoir. Thick oil corresponds to a high-power vibrator, and thin oil corresponds to a low-power vibrator.

[0083] Furthermore, in the second step, the power of the vibrator is proportional to the sand content of the oil in the reservoir. The oil layer with high sand content corresponds to a high-power vibrator, and the oil layer with low sand content corresponds to a low-power vibrator.

[0084] Furthermore, in the third step, anti-corrosion oil pipes are used in corroded oil wells; hydrogen sulfide-resistant oil pipes are used in hydrogen sulfide-containing oil wells; and high-insulation gel-lined oil pipes are used in oil wells with a lot of wax deposition to reduce heat loss, keep the fluid temperature above the wax precipitation point, reduce wax cleaning costs, and reduce hanging point loads. The oil pipes mentioned here, in the present invention, refer to tail pipes and liquid lifting pipes.

[0085] Furthermore, in the fourth step, the distribution of the pumping aids is optimized according to the gas content of the fluid, the viscosity of the crude oil, and the water content, that is, the greater the gas content, the greater the spacing between the pumping aids, and the smaller the gas content, the smaller the spacing between the pumping aids; the greater the viscosity of the crude oil, the smaller the spacing between the pumping aids, and the smaller the viscosity of the crude oil, the greater the spacing between the pumping aids; the greater the water content, the greater the spacing between the pumping aids, and the smaller the water content, the smaller the spacing between the pumping aids.

[0086] Furthermore, in the fifth step, the pipe string includes a tail pipe 1, a vibrator 2, a liquid lifting pump 3, a pumping aid 5, and a liquid lifting pipe 4 connected in sequence from bottom to top, and the upper end of the liquid lifting pump is connected to a sucker rod 6.

[0087] Furthermore, the vibrator is facing the reservoir, and a matching vibrator is applied according to the amount of oil in the oil well. By utilizing the expansion and contraction of the pipe string, the vibrator can generate continuous vibration to relieve the blockage of the reservoir.

[0088] Furthermore, the vibrator has slits or holes that can generate throttling. When the fluid passes through, the fluid flows at a variable speed and generates sound waves, which act on the oil layer, discharge free sand or loosely consolidated sand from the formation, and delay the generation of scale in the blasthole.

[0089] Furthermore, when the rod column moves upward, the pumping aid can be closed under the action of pressure and friction to lift the fluid; when the rod column moves downward, the pumping aid is opened and the fluid can freely pass through the pumping aid.

[0090] Furthermore, the outer diameter of the pumping aid and the inner diameter of the oil pipe form a gap seal, and when the rod string goes up, the gap leakage is smaller than the volume released by the pumping aid; according to the characteristics of different fluids, the pumping aid has different optimized spacings.

[0091] Furthermore, the liquid lifting pump is an oil pump with a sliding valve and a double-layer tube capable of suspending a long tail pipe.

[0092] A high-efficiency lifting pipe string for graded pumping assistance in deep oil and gas reservoirs comprises a tail pipe, a vibrator, a liquid lifting pump, a pumping assistant and a liquid lifting pipe which are sequentially connected from bottom to top, wherein the upper end of the liquid lifting pump is connected to a sucker rod.

[0093] Embodiment 3:

[0094] See also Figure 1 The present invention provides a technical solution: a high-efficiency lifting method for deep oil and gas reservoirs by assisted pumping, comprising the following steps:

[0095] The first step is to collect the early production data of the oil wells and the corresponding water well data, analyze the oil-water connectivity, and analyze the density, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir;

[0096] The second step is to select a suitable vibrator according to the reservoir analysis results;

[0097] The third step is to select the appropriate oil pipe according to the fluid analysis characteristics;

[0098] The fourth step is to design the spacing between two or more pumping aids according to the pump depth and fluid characteristics;

[0099] The fifth step is to carry out construction according to the design results. First, the tubing string is lowered, and then the tubing string is pressure tested. After the pressure test is qualified, the sucker rod is lowered to connect the liquid lifting pump. After the pressure test is qualified, normal production can be carried out.

[0100] Furthermore, in the second step, the power of the vibrator is proportional to the thickness of the oil in the reservoir. Thick oil corresponds to a high-power vibrator, and thin oil corresponds to a low-power vibrator.

[0101] Furthermore, in the second step, the power of the vibrator is proportional to the sand content of the oil in the reservoir. The oil layer with high sand content corresponds to a high-power vibrator, and the oil layer with low sand content corresponds to a low-power vibrator.

[0102] Furthermore, in the third step, anti-corrosion oil pipes are used in corroded oil wells; hydrogen sulfide-resistant oil pipes are used in hydrogen sulfide-containing oil wells; and high-insulation gel-lined oil pipes are used in oil wells with a lot of wax deposition to reduce heat loss, keep the fluid temperature above the wax precipitation point, reduce wax cleaning costs, and reduce hanging point loads. The oil pipes mentioned here, in the present invention, refer to tail pipes and liquid lifting pipes.

[0103] Furthermore, in the fourth step, the distribution of the pumping aids is optimized according to the gas content of the fluid, the viscosity of the crude oil, and the water content, that is, the greater the gas content, the greater the spacing between the pumping aids, and the smaller the gas content, the smaller the spacing between the pumping aids; the greater the viscosity of the crude oil, the smaller the spacing between the pumping aids, and the smaller the viscosity of the crude oil, the greater the spacing between the pumping aids; the greater the water content, the greater the spacing between the pumping aids, and the smaller the water content, the smaller the spacing between the pumping aids.

[0104] Furthermore, in the fifth step, the pipe string includes a tail pipe 1, a vibrator 2, a liquid lifting pump 3, a pumping aid 5, and a liquid lifting pipe 4 connected in sequence from bottom to top, and the upper end of the liquid lifting pump is connected to a sucker rod 6.

[0105] A high-efficiency lifting pipe string for graded pumping assistance in deep oil and gas reservoirs comprises a tail pipe, a vibrator, a liquid lifting pump, a pumping assistant and a liquid lifting pipe which are sequentially connected from bottom to top, wherein the upper end of the liquid lifting pump is connected to a sucker rod.

[0106] Embodiment 4:

[0107] See also Figure 1 The present invention provides a technical solution: a high-efficiency lifting method for deep oil and gas reservoirs by assisted pumping, comprising the following steps:

[0108] The first step is to collect the early production data of the oil wells and the corresponding water well data, analyze the oil-water connectivity, and analyze the density, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir;

[0109] The second step is to select a suitable vibrator according to the reservoir analysis results;

[0110] The third step is to select the appropriate oil pipe according to the fluid analysis characteristics;

[0111] The fourth step is to design the spacing between two or more pumping aids according to the pump depth and fluid characteristics;

[0112] The fifth step is to carry out construction according to the design results. First, the tubing string is lowered, and then the tubing string is pressure tested. After the pressure test is qualified, the sucker rod is lowered to connect the liquid lifting pump. After the pressure test is qualified, normal production can be carried out.

[0113] Furthermore, in the second step, the power of the vibrator is proportional to the thickness of the oil in the reservoir, thick oil corresponds to a high-power vibrator, and thin oil corresponds to a low-power vibrator. Thickness refers to the viscosity.

[0114] Furthermore, in the second step, the power of the vibrator is proportional to the sand content of the oil in the reservoir. The oil layer with high sand content corresponds to a high-power vibrator, and the oil layer with low sand content corresponds to a low-power vibrator.

[0115] Furthermore, in the third step, anti-corrosion oil pipes are used in corroded oil wells; hydrogen sulfide-resistant oil pipes are used in hydrogen sulfide-containing oil wells; and high-insulation gel-lined oil pipes are used in oil wells with a lot of wax deposition to reduce heat loss, keep the fluid temperature above the wax precipitation point, reduce wax cleaning costs, and reduce hanging point loads. The oil pipes mentioned here, in the present invention, refer to tail pipes and liquid lifting pipes.

[0116] Furthermore, in the fourth step, the distribution of the pumping aids is optimized according to the gas content of the fluid, the viscosity of the crude oil, and the water content, that is, the greater the gas content, the greater the spacing between the pumping aids, and the smaller the gas content, the smaller the spacing between the pumping aids; the greater the viscosity of the crude oil, the smaller the spacing between the pumping aids, and the smaller the viscosity of the crude oil, the greater the spacing between the pumping aids; the greater the water content, the greater the spacing between the pumping aids, and the smaller the water content, the smaller the spacing between the pumping aids.

[0117] A high-efficiency lifting pipe string for graded pumping assistance in deep oil and gas reservoirs comprises a tail pipe, a vibrator, a liquid lifting pump, a pumping assistant and a liquid lifting pipe which are sequentially connected from bottom to top, wherein the upper end of the liquid lifting pump is connected to a sucker rod.

[0118] Embodiment 5:

[0119] See also Figure 1 The present invention provides a technical solution: a high-efficiency lifting method for deep oil and gas reservoirs by assisted pumping, comprising the following steps:

[0120] The first step is to collect the early production data of the oil wells and the corresponding water well data, analyze the oil-water connectivity, and analyze the density, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir;

[0121] The second step is to select a suitable vibrator according to the reservoir analysis results;

[0122] The third step is to select the appropriate oil pipe according to the fluid analysis characteristics;

[0123] The fourth step is to design the spacing between two or more pumping aids according to the pump depth and fluid characteristics;

[0124] The fifth step is to carry out construction according to the design results. First, the tubing string is lowered, and then the tubing string is pressure tested. After the pressure test is qualified, the sucker rod is lowered to connect the liquid lifting pump. After the pressure test is qualified, normal production can be carried out.

[0125] Furthermore, in the second step, the power of the vibrator is proportional to the thickness of the oil in the reservoir. Thick oil corresponds to a high-power vibrator, and thin oil corresponds to a low-power vibrator.

[0126] Furthermore, in the second step, the power of the vibrator is proportional to the sand content of the oil in the reservoir. The oil layer with high sand content corresponds to a high-power vibrator, and the oil layer with low sand content corresponds to a low-power vibrator.

[0127] Furthermore, in the fourth step, the distribution of the pumping aids is optimized according to the gas content of the fluid, the viscosity of the crude oil, and the water content, that is, the greater the gas content, the greater the spacing between the pumping aids, and the smaller the gas content, the smaller the spacing between the pumping aids; the greater the viscosity of the crude oil, the smaller the spacing between the pumping aids, and the smaller the viscosity of the crude oil, the greater the spacing between the pumping aids; the greater the water content, the greater the spacing between the pumping aids, and the smaller the water content, the smaller the spacing between the pumping aids.

[0128] A high-efficiency lifting pipe string for graded pumping assistance in deep oil and gas reservoirs comprises a tail pipe, a vibrator, a liquid lifting pump, a pumping assistant and a liquid lifting pipe which are sequentially connected from bottom to top, wherein the upper end of the liquid lifting pump is connected to a sucker rod.

[0129] Embodiment 6:

[0130] See also Figure 1 The present invention provides a technical solution: a high-efficiency lifting method for deep oil and gas reservoirs by assisted pumping, comprising the following steps:

[0131] The first step is to collect the early production data of the oil wells and the corresponding water well data, analyze the oil-water connectivity, and analyze the density, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir;

[0132] The second step is to select a suitable vibrator according to the reservoir analysis results;

[0133] The third step is to select the appropriate oil pipe according to the fluid analysis characteristics;

[0134] The fourth step is to design the spacing between two or more pumping aids according to the pump depth and fluid characteristics;

[0135] The fifth step is to carry out construction according to the design results. First, the tubing string is lowered, and then the tubing string is pressure tested. After the pressure test is qualified, the sucker rod is lowered to connect the liquid lifting pump. After the pressure test is qualified, normal production can be carried out.

[0136] Furthermore, in the second step, the power of the vibrator is proportional to the thickness of the oil in the reservoir. Thick oil corresponds to a high-power vibrator, and thin oil corresponds to a low-power vibrator.

[0137] Furthermore, in the second step, the power of the vibrator is proportional to the sand content of the oil in the reservoir. The oil layer with high sand content corresponds to a high-power vibrator, and the oil layer with low sand content corresponds to a low-power vibrator.

[0138] A high-efficiency lifting pipe string for graded pumping assistance in deep oil and gas reservoirs comprises a tail pipe, a vibrator, a liquid lifting pump, a pumping assistant and a liquid lifting pipe which are sequentially connected from bottom to top, wherein the upper end of the liquid lifting pump is connected to a sucker rod.

[0139] Embodiment 7:

[0140] See also Figure 1 The present invention provides a technical solution: a high-efficiency lifting method for deep oil and gas reservoirs by assisted pumping, comprising the following steps:

[0141] The first step is to collect the early production data of the oil wells and the corresponding water well data, analyze the oil-water connectivity, and analyze the density, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir;

[0142] The second step is to select a suitable vibrator according to the reservoir analysis results;

[0143] The third step is to select the appropriate oil pipe according to the fluid analysis characteristics;

[0144] The fourth step is to design the spacing between two or more pumping aids according to the pump depth and fluid characteristics;

[0145] The fifth step is to carry out construction according to the design results. First, the tubing string is lowered, and then the tubing string is pressure tested. After the pressure test is qualified, the sucker rod is lowered to connect the liquid lifting pump. After the pressure test is qualified, normal production can be carried out.

[0146] A high-efficiency lifting pipe string for graded pumping assistance in deep oil and gas reservoirs comprises a tail pipe, a vibrator, a liquid lifting pump, a pumping assistant and a liquid lifting pipe which are sequentially connected from bottom to top, wherein the upper end of the liquid lifting pump is connected to a sucker rod.

[0147] All the components not described in detail above are well-known technologies in the art, such as vibrators, liquid lifting pumps, and pumping aids, which can be directly manufactured or purchased and connected for use.

[0148] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0149] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0150] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0151] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-efficiency lifting method for deep oil and gas reservoirs with graded pumping assistance, characterized in that: The following steps are involved: The first step is to collect the early production data of the oil wells and the corresponding water well data, analyze the oil-water connectivity, and analyze the density, sand content, corrosiveness, wax deposition, gas content, and water content of the reservoir; The second step is to select a suitable vibrator according to the reservoir analysis results; The third step is to select the appropriate oil pipe according to the fluid analysis characteristics; The fourth step is to design the spacing between two or more pumping aids according to the pump depth and fluid characteristics; The fifth step is to carry out construction according to the design results. First, put the pipe string in, and then test the pressure of the pipe string. After the pressure test is qualified, put the sucker rod in to connect the liquid pump, test the pumping and holding pressure to pass, and then carry out normal production; In the fifth step, the pipe string includes a tail pipe, a vibrator, a liquid lifting pump, a pumping aid, and a liquid lifting pipe connected in sequence from bottom to top, and the upper end of the liquid lifting pump is connected to a sucker rod; The vibrator is facing the reservoir, and a matching vibrator is applied according to the amount of oil in the oil well. By utilizing the expansion and contraction of the pipe string, the vibrator can generate continuous vibration to remove the blockage of the reservoir; The vibrator has a slit or hole that can generate throttling. When the fluid passes through, the fluid flows at a variable speed and generates sound waves, which act on the oil layer to discharge free sand or loosely consolidated sand from the formation and delay the generation of scale in the blasthole. In the fourth step, the distribution of the pumping aids is optimized according to the gas content of the fluid, the viscosity of the crude oil, and the water content, that is, the greater the gas content, the greater the spacing between the pumping aids, and the smaller the gas content, the smaller the spacing between the pumping aids; the greater the viscosity of the crude oil, the smaller the spacing between the pumping aids, and the smaller the viscosity of the crude oil, the greater the spacing between the pumping aids; The greater the moisture content, the greater the distance between the pumping aids, and the smaller the moisture content, the smaller the distance between the pumping aids; The power of the vibrator is proportional to the thickness of the oil in the reservoir. Thick oil corresponds to a high-power vibrator, and thin oil corresponds to a low-power vibrator. The power of the vibrator is proportional to the sand content of the oil in the oil reservoir. The oil reservoir with high sand content corresponds to a high-power vibrator, and the oil reservoir with low sand content corresponds to a low-power vibrator.

2. A high-efficiency lifting method for deep oil and gas reservoirs according to claim 1, characterized in that: In the third step, anti-corrosion oil pipes are used in corroded oil wells; hydrogen sulfide-resistant oil pipes are used in hydrogen sulfide-containing oil wells; and high-insulation gel-lined oil pipes are used in oil wells with a lot of wax deposition to reduce heat loss, keep the fluid temperature above the wax precipitation point, reduce wax cleaning costs, and reduce suspension point loads.

3. The high-efficiency lifting method for deep oil and gas reservoirs according to claim 1 is characterized in that: When the rod column moves upward, the pumping aid can be closed under the action of pressure and friction to lift the fluid; when the rod column moves downward, the pumping aid is opened, and the fluid can freely pass through the pumping aid.

4. The high-efficiency lifting method for deep oil and gas reservoirs according to claim 1 is characterized in that: The outer diameter of the pumping aid and the inner diameter of the oil pipe form a gap seal, and when the rod string goes up, the gap leakage is smaller than the volume released by the pumping aid; according to the characteristics of different fluids, the pumping aid has different optimized spacings.

5. The high-efficiency lifting method for deep oil and gas reservoirs according to claim 1, characterized in that: The liquid lifting pump is an oil pump with a sliding valve and a double-layer pipe capable of hanging a long tail pipe.

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