Concentric double tube double stage sand prevention and plugging rod type jet pump deep pumping device and use method

Abstract

The present application relates to the technical fields of deep well oil and gas drainage technology, in particular to a concentric double tube double stage sand prevention and plugging rod type jet pump deep pumping device and a use method thereof. The technical scheme is as follows: the top of the double tube positive circulation multi-pass jet pump is connected to the ground wellhead through the outer tube and the inner tube, the lower end is connected to the sand prevention and plugging rod type jet sand pumping pump through the outer tube and the inner tube, the lower end of the sand prevention and plugging rod type jet sand pumping pump is connected to the tail pipe, and a check valve is installed on the tail pipe; the upper part of the positive circulation pump body of the double tube positive circulation multi-pass jet pump is provided with an internal upper joint and an external upper joint, the lower part of the internal upper joint is provided with a nozzle, a throat pipe and a diffusion cavity, the lower part of the diffusion cavity is connected to a mixed liquid shunt outlet, and the mixed liquid shunt outlet is communicated with an upward channel and a downward channel. The beneficial effects are as follows: the present application meets the needs of long-term drainage of deep oil and gas wells, especially drainage of gas wells and pumping of sand-containing liquid, and has the characteristics of high lifting head, reliable work, simple operation, long service life and the like.

Description

Technical Field

[0001] This invention relates to the field of deep well oil and gas drainage technology, and in particular to a concentric double-pipe double-stage sand-blocking rod jet pump deep pumping device and its usage method. Background Technology

[0002] During the exploitation of deep oil and gas wells, as formation energy decreases, the dynamic fluid level of oil wells drops, and water production intensifies in gas wells and gas-water mixed-layer wells. Existing drainage and production equipment struggles to exceed 4,000 meters in lifting head and is even less suitable for deep extraction of sand-bearing liquids. Existing conventional drainage and production systems are unable to meet the need for pumping liquids with lifting heads greater than 3,500 meters. Existing single-pipe double-stage relay jet pump relay lifting technology is more suitable for drainage and production of sand-free oil wells, as the lack of gas production channels within the tubing string cannot meet the drainage and gas production needs of natural gas wells and coalbed methane wells.

[0003] For example, the Chinese patent application filed by our company, number 202310920915.3, entitled "An Ultra-High Lift Downhole Hydraulic Lift Pump Set and Its Usage Method," can meet the lifting needs of oil wells with a lift greater than 3500 meters. However, because the packer blocks the gas production channel, it cannot monitor the dynamic fluid level between the casing and the oil well, and therefore cannot meet the needs of deep gas well drainage and gas production. In oil well applications, the required packer is prone to creep, sand jamming, and has insufficient lifespan and reliability, so it is rarely used in actual production. Therefore, the single-pipe double-stage series jet pump is difficult to use for pumping oil wells with high sand content, and it cannot be used for gas well drainage and gas production. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a concentric double-pipe double-stage sand-blocking rod jet pump deep pumping device and its usage method. This device eliminates the need for packers, preserves the gas production channel, and not only meets the needs of natural gas wells and coalbed methane wells for drainage and gas production, but also enables double-stage series jetting, making it suitable for deep oil wells pumping high-sand-content fluids.

[0005] The present invention discloses a concentric dual-tube, dual-stage sand-blocking rod jet pump deep-pump device. The technical solution includes an outer tubing, an inner tubing, a dual-tube positive circulation multi-way jet pump, a sand-blocking rod jet pump, a check valve, and a tailpipe. The top of the dual-tube positive circulation multi-way jet pump is connected to the surface wellhead via the outer and inner tubing. The lower end of the dual-tube positive circulation multi-way jet pump is connected to the sand-blocking rod jet pump via the outer and inner tubing. The lower end of the sand-blocking rod jet pump is connected to the tailpipe, and a check valve is installed on the tailpipe. The dual-tube positive circulation multi-way jet pump includes an internal upper connector, a nozzle, a throat, a positive circulation pump body, and a mixing liquid separator. The pump body includes an outlet, a formation fluid channel, a downflow channel, an internal lower connector, an external lower connector, an external upper connector, an upflow channel, and an anti-clogging permeable sand filter. The upper part of the positive circulation pump body is provided with an internal upper connector and an external upper connector, which are respectively connected to the inner layer oil pipe and the outer layer oil pipe. The lower part of the internal upper connector is equipped with a nozzle, a throat, and a diffuser. The lower part of the diffuser is connected to the mixed liquid diversion outlet, which is connected to the upflow channel and the downflow channel. An anti-clogging permeable sand filter is installed in the downflow channel. The lower part of the positive circulation pump body is provided with an external lower connector and an internal lower connector, and the lower part of the formation fluid channel is connected to the internal lower connector. The upper part of the formation fluid channel is connected to the nozzle outlet.

[0006] Preferably, the aforementioned upward channel is located in the inner cavity of the positive circulation pump body, and the upper part of the upward channel is connected to the annulus of the outer and inner oil pipes connected to the upper part of the dual-pipe positive circulation multi-pass jet pump. The lower end of the downward channel is connected to the annulus of the outer and inner oil pipes connected to the lower part of the dual-pipe positive circulation multi-pass jet pump, and the anti-clogging permeable sand filter is installed in the downward channel below the mixed liquid diversion outlet.

[0007] Preferably, the aforementioned internal upper connector is located inside the external upper connector, the inner oil pipe is threadedly connected to the internal upper connector, and the outer oil pipe is threadedly connected to the external upper connector; the aforementioned internal lower connector is located inside the external lower connector, the internal lower connector is threadedly connected to the inner oil pipe, and the external lower connector is threadedly connected to the outer oil pipe.

[0008] Preferably, the aforementioned anti-sand plugging rod type jet sand pump includes an outer pump barrel, a sand pump diffuser chamber, a sand pump body, an annular throat, an accelerating spray chamber, a sand pump power fluid inlet, a sand pump fluid channel, a sand pump lower connector, a rod-type pump core, a buffer chamber, and a mixing chamber. The lower end of the outer pump barrel is fixed to the lower outer wall of the sand pump body, forming a downward power fluid channel. The lower end of the sand pump body is connected to a check valve and a tailpipe through the sand pump lower connector. The rod-type pump core sits in the lower part of the inner cavity of the sand pump body, forming an annular buffer chamber, an accelerating spray chamber, a mixing chamber, an annular throat, and a sand pump diffuser chamber from bottom to top with the inner wall of the sand pump body. The buffer chamber is connected to the downward power fluid channel through the sand pump power fluid inlet, and the mixing chamber is connected to the sand pump lower connector through the sand pump fluid outlet and the sand pump fluid channel. The upper part of the sand pump diffuser chamber is connected to the sand pump upper connector, which is connected to the inner oil pipe. The upper end of the outer pump barrel is connected to the outer oil pipe.

[0009] Preferably, the aforementioned rod-type pump core includes a pump core body, a guide cone surface, an acceleration spray chamber forming protrusion, a mixing chamber forming groove, a throat forming part, and a diffusion chamber forming part. The pump core body has a rod-shaped structure, with its bottom seated in a mounting base at the bottom of the inner cavity of the sand pump body. The pump core body has an acceleration spray chamber forming protrusion in the middle, and a guide cone surface is provided on the lower side of the acceleration spray chamber forming protrusion to form an annular acceleration spray chamber with the inner wall of the sand pump body. A mixing chamber forming groove is provided on the upper side of the acceleration spray chamber forming protrusion to form a mixing chamber with the inner wall of the sand pump body. Above the mixing chamber forming groove is a rod-shaped throat forming part to form an annular throat with the inner wall of the sand pump body. Above the throat forming part is a cone-shaped diffusion chamber forming part to form a sand pump diffusion chamber with the inner wall of the sand pump body.

[0010] Preferably, the above-mentioned anti-clogging and permeable sand filter includes an annular body and sand filter slots. The annular body is provided with multiple sets of sand filter slots along its axial direction, and the sand filter slots have a structure that is narrow at the top and wide at the bottom.

[0011] Preferably, the lower end of the aforementioned external pump cylinder is provided with one or more water supply outlets, and a mixing nozzle is installed at each water supply outlet.

[0012] Preferably, the total flow area formed by the inner diameter and number of the above-mentioned mixing nozzles is less than or equal to half of the flow cross-sectional area of ​​the acceleration spray chamber.

[0013] The method of using the concentric double-tube double-stage sand-proof plugging rod type jet pump deep pumping device mentioned in this invention includes the following process:

[0014] First, connect the outer and inner tubing to the top of the dual-tube positive circulation multi-pass jet pump. Connect the sand-proof plugging rod type jet pump to the lower end of the dual-tube positive circulation multi-pass jet pump through the outer and inner tubing. Connect the tailpipe to the lower end of the sand-proof plugging rod type jet pump and install a single-flow valve on the tailpipe to form a concentric dual-tube double-stage sand-proof plugging rod type jet pump deep pumping device. Run it down the casing to the designed position in the well.

[0015] II. During the drainage of sand-bearing oil wells, the power fluid from the surface descends along the inner tubing and enters the nozzle through the power fluid inlet of the dual-pipe positive circulation multi-pass jet pump. It draws in the mixed fluid lifted by the anti-sand plugging rod jet pump. The extracted mixed fluid is diverted through the mixed fluid diversion outlet. A portion of the mixed fluid ascends along the upward channel, passing through the annular flow channel of the inner and outer tubing to the surface. The other portion descends along the downward channel. Due to the installation of an anti-clogging and permeable sand filter in the downward channel, the descending fluid is filtered to remove sand and passes through the annular flow channel of the inner and outer tubing. The flow path descends to the downward power fluid channel of the sand-blocking rod type jet sand pump, and then enters the acceleration spray chamber for ejection. The formation fluid travels along the lower connector of the sand pump and the sand pumping fluid channel to the mixing chamber at the acceleration spray chamber. After mixing with the formation fluid, the mixture travels along the annular throat and the diffusion chamber of the sand pump to the inner tubing at the top of the sand-blocking rod type jet sand pump. It then travels upward along the inner tubing to the formation fluid channel of the dual-tube positive circulation multi-pass jet pump, and enters the mixing zone at the nozzle of the dual-tube positive circulation multi-pass jet pump, realizing cyclic relay production and pumping the sand-containing and sand-free produced fluids from the deep well to the surface.

[0016] Third, when draining gas wells to extract natural gas, the natural gas generated in the producing layer is discharged to the surface through the annulus between the concentric double-pipe double-stage sand-proof plugging rod jet pump deep pumping device and the casing, thus realizing the extraction of natural gas.

[0017] The method of using the second type of concentric double-tube double-stage sand-proof plugging rod jet pump deep pumping device mentioned in this invention includes the following process:

[0018] 1. When using this method in gas wells with low fluid output and high formation sand production, firstly, connect the outer and inner tubing to the top of the dual-tube positive circulation multi-pass jet pump. Then, connect the sand-proof rod-type jet pump to the lower end of the dual-tube positive circulation multi-pass jet pump through the outer and inner tubing. Connect the tailpipe to the lower end of the sand-proof rod-type jet pump and install a single-flow valve on the tailpipe to form a concentric dual-tube double-stage sand-proof rod-type jet pump deep pumping device. Run this device down the casing to the designed position in the well. Furthermore, the lower end of the outer pump barrel of the sand-proof rod-type jet pump is equipped with one or more sets of water supply outlets, and a mixing nozzle is installed at each water supply outlet.

[0019] II. During liquid drainage, the power fluid from the surface descends along the inner tubing and enters the nozzle through the power fluid inlet of the dual-pipe positive circulation multi-pass jet pump. It then draws in the mixed liquid lifted by the anti-sand plugging rod jet pump. The extracted mixed liquid is split through the mixed liquid diversion outlet. A portion of the mixed liquid ascends along the upward channel, passing through the annular flow channel of the inner and outer tubing to the surface. The other portion descends along the downward channel. Because an anti-clogging, permeable sand filter is installed in the downward channel, sand in the mixed liquid is filtered out. The remaining mixed liquid then descends through the annular flow channel of the inner and outer tubing to the downward flow of the anti-sand plugging rod jet pump. The power fluid channel has a portion that sprays downwards along the mixing nozzle at the water replenishment outlet to agitate the sand-containing fluid in the wellbore and replenish the fluid. Another portion of the mixing fluid enters the acceleration spray chamber and is sprayed out. The formation fluid travels along the sand pump lower connector and the sand pumping fluid channel to the mixing chamber at the acceleration spray chamber. After mixing with the formation fluid, the mixing fluid travels along the annular throat and the sand pump diffusion chamber to the inner tubing at the top of the anti-sand plugging rod jet sand pump. It then travels upwards along the inner tubing to the formation fluid channel of the dual-tube positive circulation multi-pass jet pump and enters the mixing zone at the nozzle of the dual-tube positive circulation multi-pass jet pump, achieving a cyclic relay pumping operation to pump the sand-containing fluid from the deep well to the surface.

[0020] Third, during natural gas drainage, the natural gas generated in the producing layer is drained to the surface through the annulus between the concentric double-pipe double-stage sand-blocking rod jet pump deep pumping device and the casing, thus realizing the drainage and production of natural gas.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention organically combines the functions of a concentric double pipe consisting of an inner and outer tubing with a double-pipe positive circulation multi-pass jet pump and a sand-blocking rod type jet pump, meeting the needs of long-term drainage and production in deep oil and gas wells, especially for gas well drainage and gas production and pumping sand-containing liquids. It features high lifting head, reliable operation, and simple operation. It is suitable for long-term sand-carrying oil production in deep oil wells, as well as for drainage and gas production in deep gas wells and for pumping water, removing sand and unblocking.

[0023] 2. The dual-tube positive circulation multi-pass jet pump of the present invention is equipped with an anti-clogging and permeable sand filter, which can filter out sand in the downward mixed liquid, reduce the wear of the accelerated spray chamber of the anti-sand-blocking rod jet pump, and extend its service life. In addition, the anti-sand-blocking rod jet pump adopts a specially designed rod pump core that cooperates with the inner wall of the pump body to form an annular hydraulic jet structure, which is novel in structure, convenient in construction, and highly reliable. Furthermore, a set of more than one set of mixed liquid nozzles can be provided at the lower end of the outer pump barrel to impact and agitate the sand-containing liquid in the well barrel to suspend it for easy extraction.

[0024] 3. The concentric double-pipe double-stage sand-blocking rod jet pump deep pumping device of the present invention does not require the installation of packers, thus preserving the gas production channel. It not only meets the needs of natural gas wells and coalbed methane wells for drainage and gas production, but also realizes double-stage series jetting. It can be applied to deep oil wells that pump high sand content fluid, effectively improving the reliability of the process tubing and significantly extending the pump inspection cycle and life. Attached Figure Description

[0025] Figure 1 This is a connection diagram illustrating the use of the first embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a dual-tube positive circulation multi-pass jet pump;

[0027] Figure 3 This is a structural schematic diagram of a sand-blocking rod type jet sand pump.

[0028] Figure 4 This is a schematic diagram of the main body of the sand pump of the anti-sand plugging rod type jet sand pump;

[0029] Figure 5 This is a schematic diagram of the rod-type pump core of the anti-sand plug rod type jet sand pump;

[0030] Figure 6 This is a three-dimensional structural diagram of an anti-clogging permeable sand filter;

[0031] Figure 7 This is a schematic diagram of the AA section of an anti-clogging permeable sand filter;

[0032] Figure 8 This is a connection diagram illustrating the second embodiment of the present invention during use;

[0033] Figure 9 This is a schematic diagram of the second structure of the anti-sand plugging rod type jet sand pump;

[0034] In the diagram: outer tubing 1, inner tubing 2, dual-pipe positive circulation multi-pass jet pump 3, casing 4, sand-proof plugging rod type jet sand pump 5, check valve 6, tailpipe 7;

[0035] 3.1 Internal upper connector, 3.2 Power fluid inlet, 3.3 Nozzle, 3.4 Throat, 3.5 Positive circulation pump body, 3.6 Mixed liquid diversion outlet, 3.7 Formation fluid channel, 3.8 Downward channel, 3.9 Internal lower connector, 3.10 External lower connector, 3.11 External upper connector, 3.12 Upward channel, 3.13 Diffusion chamber, 3.14 Anti-clogging permeable sand filter, 3.14 Annular body, 3.14.1 Filter sand slot, 3.14.2;

[0036] 5.1 Upper connector of sand pump, 5.2 Outer pump cylinder, 5.3 Diffusion chamber of sand pump, 5.4 Main body of sand pump, 5.5 Annular throat, 5.6 Accelerating spray chamber, 5.7 Power fluid inlet of sand pump, 5.8 Sand pump lower connector, 5.9 Downward power fluid channel, 5.10 Rod pump core, 5.11 Buffer chamber, 5.12 Mixing chamber, 5.13 Water supply outlet, 5.14 Sand pumping fluid outlet, 5.15 Mounting base, 5.16 Mixing nozzle;

[0037] Pump core body 5.11.1, guide cone surface 5.11.2, acceleration spray chamber forming protrusion 5.11.3, mixing chamber forming groove 5.11.4, throat forming part 5.11.5, diffusion chamber forming part 5.11.6. Detailed Implementation

[0038] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0039] Example 1, referring to Figures 1-2 This invention relates to a concentric double-tube, two-stage sand-blocking rod jet pump deep-pump device, comprising an outer tubing 1, an inner tubing 2, a double-tube positive circulation multi-port jet pump 3, a sand-blocking rod jet pump 5, a check valve 6, and a tailpipe 7. The top of the double-tube positive circulation multi-port jet pump 3 is connected to the surface wellhead via the outer tubing 1 and the inner tubing 2. The lower end of the double-tube positive circulation multi-port jet pump 3 is connected to the sand-blocking rod jet pump 5 via the outer tubing 1 and the inner tubing 2. The lower end of the sand-blocking rod jet pump 5 is connected to the tailpipe 7, and a check valve 6 is installed on the tailpipe 7. The double-tube positive circulation multi-port jet pump 3 includes an internal upper connector 3.1, a nozzle 3.3, a throat 3.4, a positive circulation pump body 3.5, a mixed fluid diversion outlet 3.6, a formation fluid channel 3.7, a downward channel 3.8, an internal lower connector 3.9, and an external lower connector. 3.10, external upper connector 3.11, upward channel 3.12, and anti-clogging permeable sand filter 3.14. The upper part of the positive circulation pump body 3.5 is provided with an internal upper connector 3.1 and an external upper connector 3.11, which are respectively connected to the inner oil pipe 2 and the outer oil pipe 1. The lower part of the internal upper connector 3.1 is provided with a nozzle 3.3, a throat 3.4, and a diffuser 3.13. The lower part of the diffuser 3.13 is connected to the mixed liquid diversion outlet 3.6. The mixed liquid diversion outlet 3.6 is connected to the upward channel 3.12 and the downward channel 3.8. The anti-clogging permeable sand filter 3.14 is installed in the downward channel 3.8. The lower part of the positive circulation pump body 3.5 is provided with an external lower connector 3.10 and an internal lower connector 3.9. The lower part of the formation fluid channel 3.7 is connected to the internal lower connector 3.9, and the upper part of the formation fluid channel 3.7 is connected to the nozzle 3.3 outlet.

[0040] In this invention, the upward channel 3.12 is located in the inner cavity of the positive circulation pump body 3.5, and the upper part of the upward channel 3.12 is connected to the annulus of the outer oil pipe 1 and the inner oil pipe 2 connected to the upper part of the dual-pipe positive circulation multi-pass jet pump 3. The lower end of the downward channel 3.8 is connected to the annulus of the outer oil pipe 1 and the inner oil pipe 2 connected to the lower part of the dual-pipe positive circulation multi-pass jet pump 3. The anti-clogging permeable sand filter 3.14 is installed in the downward channel 3.8 below the mixed liquid diversion outlet 3.6.

[0041] In addition, the internal upper connector 3.1 is located inside the external upper connector 3.11, the inner oil pipe 2 is threaded to the internal upper connector 3.1, and the outer oil pipe 1 is threaded to the external upper connector 3.11; the internal lower connector 3.9 is located inside the external lower connector 3.10, the internal lower connector 3.9 is threaded to the inner oil pipe 2, and the external lower connector 3.10 is threaded to the outer oil pipe 1.

[0042] Reference Figures 3-4 The sand-blocking rod-type jet sand pump 5 mentioned in this invention includes an outer pump barrel 5.2, a sand pump diffusion chamber 5.3, a sand pump body 5.4, an annular throat 5.5, an accelerating spray chamber 5.6, a sand pump power fluid inlet 5.7, a sand pump channel 5.8, a sand pump lower connector 5.9, a rod-type pump core 5.11, a buffer chamber 5.12, and a mixing chamber 5.13. The lower end of the outer pump barrel 5.2 is fixed to the lower outer wall of the sand pump body 5.4, forming a downward power fluid channel 5.10. The lower end of the sand pump body 5.4 is connected to a check valve 6 and a tailpipe 7 through the sand pump lower connector 5.9. The rod-type pump core 5.11 sits on the sand pump body 5.4. In the lower part of the inner cavity, the inner wall of the sand pump body 5.4 forms an annular structure from bottom to top, consisting of a buffer chamber 5.12, an acceleration spray chamber 5.6, a mixing chamber 5.13, an annular throat 5.5, and a sand pump diffuser chamber 5.3. The buffer chamber 5.12 is connected to the downward power fluid channel 5.10 through the sand pump power fluid inlet 5.7. The mixing chamber 5.13 is connected to the sand pump lower connector 5.9 through the sand pump fluid outlet 5.15 and the sand pump fluid channel 5.8. The upper part of the sand pump diffuser chamber 5.3 is connected to the sand pump upper connector 5.1, and the inner oil pipe 2 is connected through the sand pump upper connector 5.1. The upper end of the outer pump cylinder 5.2 is connected to the outer oil pipe 1.

[0043] Reference Figure 5The rod-type pump core 5.11 mentioned in this invention includes a pump core body 5.11.1, a guide cone surface 5.11.2, an acceleration spray chamber forming protrusion 5.11.3, a mixing chamber forming groove 5.11.4, a throat forming part 5.11.5, and a diffusion chamber forming part 5.11.6. The pump core body 5.11.1 has a rod-shaped structure, and its bottom rests in a mounting seat 5.16 at the bottom of the inner cavity of the sand pump body 5.4. The pump core body 5.11.1 has an acceleration spray chamber forming protrusion 5.11.3 in the middle, and a guide cone surface 5.11.2 is provided on the lower side of the acceleration spray chamber forming protrusion 5.11.3 for... An acceleration spray chamber 5.6, forming an annular structure with the inner wall of the sand pump body 5.4, has a mixing chamber forming groove 5.11.4 on the upper side of the acceleration spray chamber forming protrusion 5.11.3, which is used to form a mixing chamber 5.13 with the inner wall of the sand pump body 5.4; above the mixing chamber forming groove 5.11.4 is a rod-shaped throat forming part 5.11.5, which is used to form an annular throat 5.5 with the inner wall of the sand pump body 5.4; above the throat forming part 5.11.5 is a cone-shaped diffusion chamber forming part 5.11.6, which is used to form a sand pump diffusion chamber 5.3 with the inner wall of the sand pump body 5.4.

[0044] Reference Figures 6-7 The anti-clogging permeable sand filter 3.14 mentioned in this invention includes an annular body 3.14.1 and a sand filter slot 3.14.2. The annular body 3.14.1 is provided with multiple sets of sand filter slots 3.14.2 in the axial direction. The sand filter slots 3.14.2 have a structure that is narrow at the top and wide at the bottom.

[0045] The method of using the concentric double-tube double-stage sand-proof plugging rod type jet pump deep pumping device mentioned in this invention includes the following process:

[0046] First, connect the outer tubing 1 and the inner tubing 2 to the top of the dual-tube positive circulation multi-pass jet pump 3. Connect the sand-proof plugging rod type jet pump 5 to the lower end of the dual-tube positive circulation multi-pass jet pump 3 through the outer tubing 1 and the inner tubing 2. Connect the tail pipe 7 to the lower end of the sand-proof plugging rod type jet pump 5. Install the single-flow valve 6 on the tail pipe 7 to form a concentric dual-tube double-stage sand-proof plugging rod type jet pump deep pumping device. Lower it into the designed position downhole along the casing 4.

[0047] II. During the drainage of sand-bearing oil wells, the power fluid from the surface descends along the inner tubing 2, enters the nozzle 3.3 through the power fluid inlet 3.2 of the dual-pipe positive circulation multi-pass jet pump 3, and draws in the mixed liquid lifted by the anti-sand plugging rod type jet sand pump 5. The extracted mixed liquid is diverted through the mixed liquid diversion outlet 3.6. Part of the mixed liquid ascends along the upward channel 3.12, passes through the annular flow channel of the inner tubing 2 and the outer tubing 1, and reaches the surface. The other part of the mixed liquid descends along the downward channel 3.8. Because an anti-clogging and permeable sand filter 3.14 is installed in the downward channel 3.8, the descending liquid is filtered to remove sand and flows down through the annular flow channel of the inner tubing 2 and the outer tubing 1. The fluid travels to the downward power fluid channel 5.10 of the sand-blocking rod type jet sand pump 5, and then enters the acceleration spray chamber 5.6 for ejection. The formation fluid travels along the lower connector 5.9 of the sand pump and the sand pumping fluid channel 5.8 to the mixing chamber 5.13 at the acceleration spray chamber 5.6. After the mixed fluid and formation fluid are mixed, they travel along the annular throat 5.5 and the diffusion chamber 5.3 of the sand pump to the inner oil pipe 2 at the top of the sand-blocking rod type jet sand pump 5. They travel up along the inner oil pipe 2 to the formation fluid channel 3.7 of the double-pipe positive circulation multi-pass jet pump 3, and enter the mixing zone at the nozzle 3.3 of the double-pipe positive circulation multi-pass jet pump 3, realizing the circulation relay production and pumping the sand-containing and sand-free produced fluids from the deep well to the surface.

[0048] Third, when draining gas wells to extract natural gas, the natural gas generated in the producing layer is drained to the surface through the annulus between the concentric double-pipe double-stage sand-blocking rod jet pump deep pumping device and casing 4, thus realizing the drainage and production of natural gas.

[0049] Example 2: The concentric double-tube, two-stage sand-blocking rod jet pump deep-pump device mentioned in this invention includes an outer tubing 1, an inner tubing 2, a double-tube positive circulation multi-pass jet pump 3, a sand-blocking rod jet pump 5, a check valve 6, and a tailpipe 7. The top of the double-tube positive circulation multi-pass jet pump 3 is connected to the surface wellhead through the outer tubing 1 and the inner tubing 2. The lower end of the double-tube positive circulation multi-pass jet pump 3 is connected to the sand-blocking rod jet pump 5 through the outer tubing 1 and the inner tubing 2. The lower end of the sand-blocking rod jet pump 5 is connected to the tailpipe 7, and a check valve 6 is installed on the tailpipe 7. The double-tube positive circulation multi-pass jet pump 3 includes an internal upper connector 3.1, a power fluid inlet 3.2, a nozzle 3.3, a throat 3.4, a positive circulation pump body 3.5, a mixed fluid diversion outlet 3.6, a formation fluid channel 3.7, a downflow channel 3.8, and an internal lower connector 3. 9. External lower connector 3.10, external upper connector 3.11, upward channel 3.12, and anti-clogging permeable sand filter 3.14. The upper part of the positive circulation pump body 3.5 is provided with an internal upper connector 3.1 and an external upper connector 3.11, which are respectively connected to the inner oil pipe 2 and the outer oil pipe 1. The lower part of the internal upper connector 3.1 is provided with a nozzle 3.3, a throat 3.4, and a diffuser 3.13. The lower part of the diffuser 3.13 is connected to the mixed liquid diversion outlet 3.6. The mixed liquid diversion outlet 3.6 is connected to the upward channel 3.12 and the downward channel 3.8. The anti-clogging permeable sand filter 3.14 is installed in the downward channel 3.8. The lower part of the positive circulation pump body 3.5 is provided with an external lower connector 3.10 and an internal lower connector 3.9. The lower part of the formation fluid channel 3.7 is connected to the internal lower connector 3.9, and the upper part of the formation fluid channel 3.7 is connected to the nozzle 3.3 outlet.

[0050] The difference from Example 1 is:

[0051] Reference Figures 8-9 The lower end of the outer pump cylinder 5.2 mentioned in this invention is provided with one or more water supply outlets 5.14, and a mixing nozzle 5.17 is installed at each water supply outlet 5.14. The total flow area formed by the inner diameter and number of the above-mentioned mixing nozzles 5.17 is less than or equal to half of the flow cross-sectional area of ​​the annular nozzle 5.6 of the reverse circulation jet pump.

[0052] The method of using another concentric double-tube double-stage sand-blocking rod type jet pump deep pumping device mentioned in this invention includes the following process:

[0053] 1. When using this method in gas wells with low fluid output and high formation sand production, firstly, connect the outer tubing 1 and inner tubing 2 to the top of the dual-tube positive circulation multi-pass jet pump 3. Then, connect the sand-proof rod-type jet pump 5 to the lower end of the dual-tube positive circulation multi-pass jet pump 3 through the outer tubing 1 and inner tubing 2. Connect the tailpipe 7 to the lower end of the sand-proof rod-type jet pump 5 and install a single-flow valve 6 on the tailpipe 7 to form a concentric dual-tube double-stage sand-proof rod-type jet pump deep pumping device. Lower the device downhole to the designed position along the casing 4. Furthermore, at the lower end of the outer pump barrel 5.2 of the sand-proof rod-type jet pump 5, there is one or more sets of water supply outlets 5.14. Install a mixed liquid sand flushing nozzle at each water supply outlet 5.14.

[0054] II. During liquid drainage, the power fluid from the surface descends along the inner tubing 2, enters the nozzle 3.3 through the power fluid inlet 3.2 of the dual-pipe positive circulation multi-pass jet pump 3, and draws in the mixed liquid lifted by the anti-sand plugging rod type jet sand pump 5. The extracted mixed liquid is diverted through the mixed liquid diversion outlet 3.6. Part of the mixed liquid ascends along the upward channel 3.12, passes through the annular flow channel of the inner tubing 2 and the outer tubing 1, and reaches the surface. The other part of the mixed liquid descends along the downward channel 3.8. Because an anti-clogging permeable sand filter 3.14 is installed in the downward channel 3.8, sand in the mixed liquid is filtered out, reducing wear on the anti-sand plugging rod type jet sand pump 5 and extending its service life. It then descends through the annular flow channel of the inner tubing 2 and the outer tubing 1 to the anti-sand plugging rod type jet... A portion of the downward power fluid channel 5.10 of the sand pump 5 is sprayed downwards through the mixing nozzle 5.17 of the water replenishment outlet 5.14 to agitate the sand-containing liquid in the wellbore and replenish the liquid. Another portion of the mixed liquid enters the acceleration spray chamber 5.6 and is sprayed out. The formation fluid comes to the mixing chamber 5.13 at the acceleration spray chamber 5.6 along the sand pump lower connector 5.9 and the sand pumping fluid channel 5.8. After the mixed liquid and the formation fluid are mixed, they enter the inner tubing 2 at the top of the sand-proof plugging rod type jet sand pump 5 along the annular throat 5.5 and the sand pump diffusion chamber 5.3. They then go up along the inner tubing 2 to the formation fluid channel 3.7 of the double-pipe positive circulation multi-pass jet pump 3 and enter the mixing zone at the nozzle 3.3 of the double-pipe positive circulation multi-pass jet pump 3 to achieve cyclic relay drainage and pump the sand-containing liquid in the deep well to the surface.

[0055] Third, during natural gas drainage, the natural gas generated in the producing layer is drained to the surface through the annulus between the concentric double-pipe double-stage sand-blocking rod jet pump deep pumping device and casing 4, thus realizing the drainage of natural gas.

[0056] The above description is merely a partial preferred embodiment of the present invention. Any person skilled in the art can modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A concentric double-pipe double-stage sand-proof plugging rod jet pump deep-drawing device, comprising an outer oil pipe (1), characterized in that: It also includes an inner tubing (2), a dual-tube positive circulation multi-pass jet pump (3), a sand-proof plugging rod type jet sand pump (5), a single-flow valve (6), and a tailpipe (7). The top of the dual-tube positive circulation multi-pass jet pump (3) is connected to the surface wellhead through the outer tubing (1) and the inner tubing (2). The lower end of the dual-tube positive circulation multi-pass jet pump (3) is connected to the sand-proof plugging rod type jet sand pump (5) through the outer tubing (1) and the inner tubing (2). (5) The lower end is connected to the tailpipe (7), and a check valve (6) is installed on the tailpipe (7); the dual-pipe positive circulation multi-pass jet pump (3) includes an internal upper connector (3.1), a nozzle (3.3), a throat (3.4), a positive circulation pump body (3.5), a mixed liquid diversion outlet (3.6), a formation fluid channel (3.7), a downward channel (3.8), an internal lower connector (3.9), an external lower connector (3.10), an external upper connector (3.11), and an upper... The positive circulation pump body (3.5) has an internal upper connector (3.1) and an external upper connector (3.11) on its upper part, which are respectively connected to the inner oil pipe (2) and the outer oil pipe (1). The lower part of the internal upper connector (3.1) is equipped with a nozzle (3.3), a throat (3.4) and a diffuser (3.13). The lower part of the diffuser (3.13) is connected to the mixed liquid diversion outlet (3.6). The diversion outlet (3.6) is connected to the upward channel (3.12) and the downward channel (3.8). A clogging-proof permeable sand filter (3.14) is installed in the downward channel (3.8). The lower part of the positive circulation pump body (3.5) is provided with an external lower connector (3.10) and an internal lower connector (3.9). The lower part of the formation fluid channel (3.7) is connected to the internal lower connector (3.9). The upper part of the formation fluid channel (3.7) is connected to the nozzle (3.3) outlet. The upward channel (3.12) is located in the inner cavity of the positive circulation pump body (3.5), and the upper part of the upward channel (3.12) is connected to the annulus of the outer oil pipe (1) and the inner oil pipe (2) connected to the upper part of the double-pipe positive circulation multi-pass jet pump (3). The lower end of the downward channel (3.8) is connected to the annulus of the outer oil pipe (1) and the inner oil pipe (2) connected to the lower part of the double-pipe positive circulation multi-pass jet pump (3). The anti-clogging permeable sand filter (3.14) is installed in the downward channel (3.8) below the mixed liquid diversion outlet (3.6). The sand-blocking rod-type jet sand pump (5) includes an outer pump barrel (5.2), a sand pump diffusion chamber (5.3), a sand pump body (5.4), an annular throat (5.5), an acceleration spray chamber (5.6), a sand pump power fluid inlet (5.7), a sand pump channel (5.8), a sand pump lower connector (5.9), a rod-type pump core (5.11), a buffer chamber (5.12), and a mixing chamber (5.13). The lower end of the outer pump barrel (5.2) is fixed to the lower outer wall of the sand pump body (5.4), forming a downward power fluid channel (5.10). The lower end of the sand pump body (5.4) is connected to a check valve (6) and a tailpipe (7) through the sand pump lower connector (5.9). The rod-type pump core (5.11) sits on the sand pump body (5.4). In the lower part of the inner cavity, the inner wall of the sand pump body (5.4) forms an annular structure of buffer chamber (5.12), acceleration spray chamber (5.6), mixing chamber (5.13), annular throat (5.5) and sand pump diffusion chamber (5.3) in sequence from bottom to top. The buffer chamber (5.12) is connected to the downward power fluid channel (5.10) through the sand pump power fluid inlet (5.7). The mixing chamber (5.13) is connected to the sand pump lower connector (5.9) through the sand pump fluid outlet (5.15) and sand pump fluid channel (5.8). The upper part of the sand pump diffusion chamber (5.3) is connected to the sand pump upper connector (5.1), and the sand pump upper connector (5.1) is connected to the inner oil pipe (2). The upper end of the outer pump barrel (5.2) is connected to the outer oil pipe (1).

2. The deep-drawing device for a concentric double-tube, double-stage sand-blocking rod jet pump according to claim 1, characterized in that: The inner upper connector (3.1) is located inside the outer upper connector (3.11), the inner oil pipe (2) is threaded to the inner upper connector (3.1), and the outer oil pipe (1) is threaded to the outer upper connector (3.11); the inner lower connector (3.9) is located inside the outer lower connector (3.10), the inner lower connector (3.9) is threaded to the inner oil pipe (2), and the outer lower connector (3.10) is threaded to the outer oil pipe (1).

3. The deep-drawing device for a concentric double-tube, double-stage sand-blocking rod jet pump according to claim 2, characterized in that: The rod-type pump core (5.11) includes a pump core body (5.11.1), a guide cone surface (5.11.2), an acceleration spray chamber forming protrusion (5.11.3), a mixing chamber forming groove (5.11.4), a throat forming part (5.11.5), and a diffusion chamber forming part (5.11.6). The pump core body (5.11.1) is a rod-shaped structure, with its bottom seated in the mounting base (5.16) at the bottom of the inner cavity of the sand pump body (5.4). The pump core body (5.11.1) has an acceleration spray chamber forming protrusion (5.11.3) in the middle, and a guide cone surface (5.11.2) is provided on the lower side of the acceleration spray chamber forming protrusion (5.11.3) to form an annular acceleration spray chamber (5.6) with the inner wall of the sand pump body (5.4). A mixing chamber forming groove is provided on the upper side of the acceleration spray chamber forming protrusion (5.11.3). 5.11.4), used to form a mixing cavity (5.13) with the inner wall of the sand pump body (5.4); the upper part of the groove (5.11.4) in the mixing cavity is a rod-shaped throat forming part (5.11.5), used to form an annular throat (5.5) with the inner wall of the sand pump body (5.4); the upper part of the throat forming part (5.11.5) is a cone-shaped diffusion cavity forming part (5.11.6), used to form a sand pump diffusion cavity (5.3) with the inner wall of the sand pump body (5.4).

4. The deep-drawing device for a concentric double-tube, double-stage sand-blocking rod jet pump according to claim 3, characterized in that: The anti-clogging permeable sand filter (3.14) includes an annular body (3.14.1) and sand filter slots (3.14.2). The annular body (3.14.1) has multiple sets of sand filter slots (3.14.2) along its axial direction. The sand filter slots (3.14.2) have a structure that is narrow at the top and wide at the bottom.

5. The deep-drawing device for a concentric double-tube, double-stage sand-blocking rod jet pump according to claim 4, characterized in that: The lower end of the external pump cylinder (5.2) is provided with one or more water supply outlets (5.14), and a mixing nozzle (5.17) is installed at each water supply outlet (5.14).

6. The deep-drawing device for a concentric double-tube, double-stage sand-blocking rod jet pump according to claim 5, characterized in that: The total flow area formed by the inner diameter and number of the mixing nozzles (5.17) is less than or equal to half of the flow cross-sectional area of ​​the acceleration spray chamber (5.6).

7. A method of using the concentric double-tube double-stage sand-blocking rod type jet pump deep-drawing device as described in claim 4, characterized in that: Includes the following processes: First, connect the outer oil pipe (1) and the inner oil pipe (2) to the top of the double-pipe positive circulation multi-pass jet pump (3), connect the sand-proof plugging rod type jet sand pump (5) to the lower end of the double-pipe positive circulation multi-pass jet pump (3) through the outer oil pipe (1) and the inner oil pipe (2), connect the tail pipe (7) to the lower end of the sand-proof plugging rod type jet sand pump (5), install a single flow valve (6) on the tail pipe (7) to form a concentric double-pipe double-stage sand-proof plugging rod type jet pump deep pumping device, and lower the concentric double-pipe double-stage sand-proof plugging rod type jet pump deep pumping device along the casing (4) to the designed position in the well.

2. During the drainage of sand-bearing oil wells, the power fluid from the surface descends along the inner tubing (2) and enters the nozzle (3.3) through the power fluid inlet (3.2) of the dual-pipe positive circulation multi-pass jet pump (3). It draws in the mixed liquid lifted by the anti-sand plugging rod type jet sand pump (5). The extracted mixed liquid is diverted through the mixed liquid diversion outlet (3.6). Part of the mixed liquid ascends along the upward channel (3.12) and ascends to the surface through the annular flow channel of the inner tubing (2) and the outer tubing (1). The other part of the mixed liquid descends along the downward channel (3.8). Since an anti-clogging permeable sand filter (3.14) is installed in the downward channel (3.8), the sand is filtered out of the descending liquid, and it descends to the surface through the annular flow channel of the inner tubing (2) and the outer tubing (1). The downward power fluid channel (5.10) of the sand-blocking rod type jet sand pump (5) then enters the acceleration spray chamber (5.6) and is ejected. The formation fluid comes to the mixing chamber (5.13) at the acceleration spray chamber (5.6) along the lower connector (5.9) and sand pumping fluid channel (5.8) of the sand pump. After the mixed fluid and formation fluid are mixed, they enter the inner oil pipe (2) at the top of the sand-blocking rod type jet sand pump (5) along the annular throat (5.5) and the diffusion chamber (5.3) of the sand pump. They go up along the inner oil pipe (2) to the formation fluid channel (3.7) of the double-pipe positive circulation multi-pass jet pump (3) and enter the mixing zone at the nozzle (3.3) of the double-pipe positive circulation multi-pass jet pump (3) to realize the circulation relay discharge and pump the sand-containing and sand-free produced liquids in the deep well to the surface.

3. When draining gas wells to extract natural gas, the natural gas generated in the producing layer is drained to the surface through the annulus between the concentric double-pipe double-stage sand-blocking rod jet pump deep pumping device and the casing (4), thus realizing the extraction of natural gas.

8. A method of using the concentric double-tube double-stage sand-blocking rod type jet pump deep-drawing device as described in claim 6, characterized in that: Includes the following processes:

1. When using this method in a gas well with low fluid output and high formation sand production, firstly, connect the outer tubing (1) and inner tubing (2) to the top of the dual-tube positive circulation multi-pass jet pump (3). At the lower end of the dual-tube positive circulation multi-pass jet pump (3), connect the sand-proof plugging rod type jet sand pump (5) through the outer tubing (1) and inner tubing (2). Connect the tailpipe (7) to the lower end of the sand-proof plugging rod type jet sand pump (5). Install the tailpipe (7) on the tailpipe (7). Install a single-flow valve (6) to form a concentric double-pipe double-stage anti-sand plugging rod jet pump deep pumping device. Lower the concentric double-pipe double-stage anti-sand plugging rod jet pump deep pumping device into the designed position downhole along the casing (4). Furthermore, at the lower end of the outer pump barrel (5.2) of the anti-sand plugging rod jet sand pump (5), there is one or more sets of water supply outlets (5.14). Install a mixing nozzle (5.17) at each water supply outlet (5.14).

2. During liquid drainage, the power fluid from the ground descends along the inner tubing (2) and enters the nozzle (3.3) through the power fluid inlet (3.2) of the dual-pipe positive circulation multi-pass jet pump (3). It draws in the mixed liquid lifted by the anti-sand plugging rod jet sand pump (5). The extracted mixed liquid is diverted through the mixed liquid diversion outlet (3.6). Part of the mixed liquid ascends along the upward channel (3.12) and ascends to the ground through the annular flow channel of the inner tubing (2) and the outer tubing (1). The other part of the mixed liquid descends along the downward channel (3.8). Since an anti-clogging permeable sand filter (3.14) is installed in the downward channel (3.8), the sand in the mixed liquid is filtered out. Then, it descends through the annular flow channel of the inner tubing (2) and the outer tubing (1) to the downward power fluid channel (5.1) of the anti-sand plugging rod jet sand pump (5). 0), a portion of the mixture is sprayed downwards along the mixing nozzle (5.17) of the water replenishment outlet (5.14) to agitate the sand-containing liquid in the wellbore and replenish the liquid. Another portion of the mixture enters the acceleration spray chamber (5.6) and is sprayed out. The formation fluid comes to the mixing chamber (5.13) at the acceleration spray chamber (5.6) along the sand pump lower connector (5.9) and the sand pumping fluid channel (5.8). After the mixture and the formation fluid are mixed, they enter the inner tubing (2) at the top of the anti-sand plugging rod jet sand pump (5) along the annular throat (5.5) and the sand pump diffusion chamber (5.3). They go up along the inner tubing (2) to the formation fluid channel (3.7) of the double-pipe positive circulation multi-pass jet pump (3) and enter the mixing zone at the nozzle (3.3) of the double-pipe positive circulation multi-pass jet pump (3) to realize the circulation relay drainage and pump the sand-containing liquid in the deep well to the surface. Third, during natural gas drainage, the natural gas generated in the producing layer is drained to the ground through the annulus between the concentric double-pipe double-stage sand-blocking rod jet pump deep pumping device and the casing (4), so as to realize the normal production of natural gas.

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