Low back pressure deep penetration hydraulic sandblasting perforating device and use method
By using components such as back pressure suction pumps and single-flow valves in the hydraulic sand blasting perforation device, perforation in the low back pressure state is achieved, solving the problems of perforation depth and efficiency caused by high back pressure, and improving the perforation The mass and hole length are used to clear the blockage in the well through the negative pressure deblocking function, which significantly improves the deep well perforation effect.
Patent Information
- Application Number
- CN202411301228.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2044-09-18
AI Technical Summary
The existing underground hydraulic sandblasting perforation device reduces the perforation depth and seam length due to high back pressure, and the waste sand liquid perforation liquid and fine crushed sand particles are retained, reducing the jet perforation efficiency, and the perforation gun is perturbed and torsional. The regularity of the eyelets and casing integrity are likely to cause casing damage, especially in deep and large slope wells.
The low back pressure deep penetration hydraulic sand blasting and perforation device is adopted to absorb the waste sand liquid and sand liquid columns on the upper part of the hydraulic sand blasting and perforation gun through the back pressure suction pump to realize the sand blasting and perforation holes under low back pressure state. , combined with a single flow valve, inner pipe, packer and sand and liquid absorption pipe, ensure that the perforation gun works under low back pressure, reduce the contamination of liquid flow to the formation and eyelets, and pass the back pressure suction pump and sand filter pipe Achieve high-pressure and high-speed jets.
It significantly improves the hole length and penetration depth of the perforation, avoids waste sand liquid pollution, enhances the jet pressure difference, improves the perforation quality and production effect, and effectively removes blockages in the well through negative pressure suction and deblocking. The quality of the perforation process and the integrity of the casing are guaranteed.
Smart Images
Figure CN118815423B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of oil and gas field exploitation engineering, and in particular to a low back pressure deep penetration hydraulic sandblasting perforating device and a use method thereof. Background Art
[0002] At present, in oil and gas field exploitation projects, due to the advantages of hydraulic sandblasting perforation that it avoids the compaction and blockage of blastholes caused by ammunition perforation, and has large perforation aperture and depth, the returned sand-containing liquid of the existing downhole hydraulic sandblasting perforation device is pushed out of the ground by the residual pressure of the injection liquid after the injection, and is a high back pressure jet in the state of sand liquid column submersion. Due to the high back pressure value of the perforating gun and the blasthole in the well, the actual working pressure difference of the perforating nozzle is largely offset by the back pressure of the liquid column, and the net jet pressure difference before and after the nozzle is greatly reduced, especially in deep wells, which directly reduces the penetration depth and seam length of the perforation hole, resulting in residual liquid infiltration in the hole, and fine sand particles are easily retained in the blasthole, which reduces the jet perforation efficiency, and also invades the perforated hole and formation. These unfavorable factors seriously restrict the perforation effect. Secondly, the existing hydraulic sandblasting perforating process is affected by the creep and torsion of the perforating gun, which may also cause irregular holes and damage to the casing. For deep wells and high-angle wells, it is easy to cause casing deformation and damage. Summary of the invention
[0003] The purpose of the present invention is to provide a low back pressure deep penetration hydraulic sandblasting perforating device and a method of use in view of the above defects in the prior art. The waste sand liquid and the sand liquid column on the upper part of the hydraulic sandblasting perforating gun are sucked away by a back pressure suction pump, thereby realizing sandblasting perforating under low back pressure, thereby producing a greater perforating depth and avoiding the contamination of the formation and the hole by the waste sand liquid flow.
[0004] The present invention discloses a low back pressure deep penetration hydraulic sandblasting perforating device and a method for using the device, comprising a hydraulic sandblasting perforating gun and a check valve. The hydraulic sandblasting perforating gun is lowered into a casing to be perforated through an oil pipe, and the lower part of the hydraulic sandblasting perforating gun is connected to the check valve, wherein the hydraulic sandblasting perforating gun also comprises an inner pipe, a back pressure suction pump, a packer, a sand liquid absorption pipe, and an inner pipe packer. The upper part of the hydraulic sandblasting perforating gun is connected to the inner pipe and the oil pipe, and the inner pipe packer is installed between the inner pipe and the oil pipe. The back pressure suction pump is connected to the upper part of the oil pipe and the inner pipe, and the packer is installed between the oil pipe and the casing below the back pressure suction pump. The sand liquid absorption pipe is installed on the oil pipe below the packer. The upper part of the back pressure suction pump is connected to the core pipe and the oil pipe. The waste sand liquid and the sand liquid column on the upper part of the hydraulic sandblasting perforating gun are sucked away by the back pressure suction pump, so that the upper part of the hydraulic sandblasting perforating gun presents a low back pressure state.
[0005] Preferably, the above-mentioned back-pressure suction pump includes a liquid outlet, a diffusion chamber, a core tube, a sand pump assembly, a throat section, a liquid suction port, an injection section, and a sand filter tube. The upper side of the sand pump assembly is provided with a liquid outlet, a conical diffusion chamber is provided below the liquid outlet, a liquid suction port is provided in the middle part of the sand pump assembly, and a liquid injection buffer chamber is provided in the lower part of the sand pump assembly. The core tube and the sand filter tube are installed in the inner cavity of the sand pump assembly, and the core tube and the middle inner cavity of the sand pump assembly form a throat section and an injection section.
[0006] Preferably, the upper part of the core tube is connected to the top of the sand pump assembly through an upper spacer ring, the lower end of the core tube is movably connected to the sand filter tube, and the lower end of the sand filter tube is connected to the bottom of the sand pump assembly through a lower spacer ring.
[0007] Preferably, the upper outer wall of the above-mentioned sand pump assembly is provided with a leather cup seal.
[0008] Preferably, the above-mentioned sand and liquid absorption pipe includes a sand and liquid absorption pipe body and a sand absorption inclined hole. A plurality of sand absorption inclined holes are provided on the outer wall of the sand and liquid absorption pipe body, and the waste sand liquid and sand and liquid column on the upper part of the hydraulic sandblasting perforating gun are absorbed through the sand absorption inclined holes.
[0009] Preferably, the outer wall of the inner tube corresponding to the inside of the above-mentioned sand and liquid absorption pipe is provided with a wear-resistant thickened layer, and the waste sand liquid and sand and liquid column absorbed by the sand absorption inclined hole first touch the wear-resistant thickened layer.
[0010] Preferably, the above-mentioned hydraulic sandblasting perforating gun includes a perforating gun body, a sleeve, a perforating nozzle, an upper joint, and a lower joint. The upper end of the perforating gun body is provided with an upper joint, the lower end is provided with a lower joint, and more than two groups of perforating nozzles are provided in the middle of the perforating gun body, and the perforating nozzles are installed on the outer wall of the perforating gun body through the sleeve.
[0011] Preferably, the above-mentioned perforating nozzle includes a nozzle body, an outer nozzle, a conical flow channel, and an external thread. The center of the nozzle body is provided with a conical flow channel and an outer nozzle, the conical flow channel is located in the inner cavity, and the inner outer wall of the nozzle body is provided with an external thread, which is movably connected to the sleeve through the external thread.
[0012] The method for using the low back pressure deep penetration hydraulic sandblasting perforating device mentioned in the present invention comprises the following process:
[0013] First, lower the tubing string into the well, point the hydraulic sandblasting perforating gun at the starting position where sandblasting perforation is required, install the ground well control device, start the ground injection equipment, and inject high-pressure perforating sand liquid into the well according to the design parameters to perform high-pressure sandblasting perforation; a part of the high-pressure perforating sand liquid reaches the hydraulic sandblasting perforating gun along the oil pipe and core pipe, and is ejected from the perforating nozzle at high speed, impacting and grinding the penetrating casing, cementing cement, and rock in turn, forming a longer hole than conventional high back pressure perforating; another part of the high-pressure perforating sand liquid flows through the back pressure suction pump When the sand is filtered out through the sand filter tube, part of the high-pressure water without sand enters the liquid injection buffer chamber, and is sprayed upward along the injection section of the sandwich wall chamber formed by the core tube and the sand pump assembly, sucking the waste sand liquid and the sand liquid column from the hydraulic sandblasting perforating gun, so that the upper part of the hydraulic sandblasting perforating gun presents a low back pressure state, and then, after the high-pressure water is mixed with the waste sand liquid and the sand liquid column, it is discharged upward along the annular space formed between the oil pipe and the casing to the ground, ensuring the high-pressure and high-speed jet of the hydraulic sandblasting perforating gun under the condition of no submergence back pressure, and shooting longer holes;
[0014] Secondly, after the first perforation is completed, the surface sand and liquid pump speed is lowered, and the construction pressure is immediately reduced. Then, the pipe string is lifted to the upper section to be perforated, and high-pressure perforating sand and liquid are continuously injected into the well according to the design parameters to carry out the perforation construction of the perforation section.
[0015] Finally, after the perforation is completed, the construction stage of clearing the sand in the well and jetting to remove the blockage begins. The operating steps are: shut down the sand adding equipment in the ground injection equipment, start the high-pressure water pump to inject high-pressure and high-displacement power water into the oil pipe, and a part of the water flows directly downward to the hydraulic sandblasting perforating gun to perform high-pressure jet flushing on the ejected holes, and the other part of the high-pressure water passes through the sand filter pipe of the back pressure suction pump to form a ring spray and draw the return fluid of the flushing and lift it to the ground, so that the ejected holes and the blockages in the near-well formation are sucked to the ground, playing the role of negative pressure suction and reverse discharge of high-pressure jets to remove blockages.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0017] 1. The present invention ingeniously diverts a part of the high-pressure perforating sand liquid, and uses a back-pressure suction pump to suck away the waste sand liquid and sand liquid column above the hydraulic sandblasting perforating gun, so that it presents a low back-pressure state, reduces the hydraulic resistance, and effectively amplifies the inlet and outlet pressure difference of the perforating nozzle of the hydraulic sandblasting perforating gun, thereby effectively amplifying the jet pressure difference without increasing the ground power hydraulic pressure, thereby greatly increasing the hole length of the perforation, that is, the penetration depth, and thus greatly improving the quality of sandblasting perforation and the post-perforation production effect;
[0018] 2. The back pressure suction pump of the present invention has a novel structure, smooth flow line, is not easy to be blocked by sand settling, is resistant to sand abrasion, and can meet the needs of multiple displacement perforation in long well sections; due to the existence of negative pressure in the annulus of the oil casing in the well, negative pressure will be generated at the upper part of the perforation to release the blockage, and the particles invading the formation during the perforation process will also be sucked out to the ground, thereby playing an excellent role in removing blockage;
[0019] 3. The cup seal, packer and inner tube packer of the present invention have an anchoring effect of preventing creep and inhibiting rotation of the pipe string in the sandblasting perforation process, thereby ensuring the quality and effect of the perforation. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the structure of the present invention;
[0021] Figure 2 It is a schematic diagram of the structure of a back pressure suction pump;
[0022] Figure 3 It is a structural schematic diagram of the sand liquid absorption pipe;
[0023] Figure 4 It is a schematic diagram of the structure of a hydraulic sandblasting perforating gun;
[0024] Figure 5 yes Figure 4 A magnified schematic diagram of part A in FIG.
[0025] Figure 6 is a schematic diagram of the structure of a perforating nozzle;
[0026] In the figure above: casing 1, tubing 2, inner tube 3, back pressure suction pump 4, packer 5, sand liquid absorption pipe 6, inner tube packer 7, hydraulic sandblasting perforating gun 8, check valve 9, wear-resistant thickening layer 10;
[0027] Liquid outlet 4.1, leather cup seal 4.2, diffusion chamber 4.3, core tube 4.4, sand pump assembly 4.5, throat section 4.6, liquid suction port 4.7, injection section 4.8, sand filter tube 4.9, lower spacer ring 4.10, upper spacer ring 4.11, liquid injection buffer chamber 4.12;
[0028] Liquid absorption pipe body 6.1, sand absorption inclined hole 6.2;
[0029] Perforating gun body 8.1, sheath 8.2, perforating nozzle 8.3, upper joint 8.4, lower joint 8.5, nozzle body 8.3.1, external nozzle 8.3.2, tapered flow channel 8.3.3, external thread 8.3.4. DETAILED DESCRIPTION
[0030] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0031] Example 1, reference Figure 1-Figure 6 The present invention relates to a low back pressure deep penetration hydraulic sandblasting perforating device and a method of use, comprising a hydraulic sandblasting perforating gun 8 and a check valve 9, the hydraulic sandblasting perforating gun 8 is lowered into the casing 1 to be perforated through the oil pipe 2, the lower part of the hydraulic sandblasting perforating gun 8 is connected to the check valve 9, wherein the inner pipe 3, the back pressure suction pump 4, the packer 5, the sand liquid absorption pipe 6, the inner pipe packer 7 are also included, the upper part of the hydraulic sandblasting perforating gun 8 is connected to the inner pipe 3 and the oil pipe 2, and the inner pipe 3 and the oil pipe 2, a back pressure suction pump 4 is connected to the upper parts of the oil pipe 2 and the inner pipe 3, and a packer 5 is installed between the oil pipe 2 and the casing 1 below the back pressure suction pump 4, a sand liquid absorption pipe 6 is installed on the oil pipe 2 below the packer 5, and the upper part of the back pressure suction pump 4 is connected to the core pipe 4.4 and the oil pipe 2, and the waste sand liquid and sand liquid column on the upper part of the hydraulic sandblasting perforating gun 8 are sucked away by the back pressure suction pump 4, so that the upper part of the hydraulic sandblasting perforating gun 8 is in a low back pressure state.
[0032] Reference Figure 2 The back pressure suction pump 4 mentioned in the present invention comprises a liquid outlet 4.1, a diffusion chamber 4.3, a core tube 4.4, a sand pump assembly 4.5, a throat section 4.6, a liquid suction port 4.7, an injection section 4.8, and a sand filter tube 4.9. The upper side of the sand pump assembly 4.5 is provided with a liquid outlet 4.1, a conical diffusion chamber 4.3 is provided below the liquid outlet 4.1, a liquid suction port 4.7 is provided in the middle of the sand pump assembly 4.5, and a liquid injection buffer chamber 4.12 is provided at the lower part of the sand pump assembly 4.5. The inner cavity of the sand pump assembly 4.5 is installed with a core tube 4.4 and a sand filter tube 4.9, and the core tube 4.4 and the middle inner cavity of the sand pump assembly 4.5 form a throat section 4.6 and an injection section 4.8.
[0033] The upper part of the core tube 4.4 mentioned in the present invention is connected to the top of the sand pump assembly 4.5 through the upper spacer ring 4.11, the lower end of the core tube 4.4 is movably connected to the sand filter tube 4.9, and the lower end of the sand filter tube 4.9 is connected to the bottom end of the sand pump assembly 4.5 through the lower spacer ring 4.10.
[0034] The upper outer wall of the sand pump assembly 4.5 mentioned in the present invention is provided with a leather cup seal 4.2.
[0035] Reference Figure 3 The sand and liquid absorption pipe 6 mentioned in the present invention includes a sand and liquid absorption pipe body 6.1 and a sand absorption inclined hole 6.2. A plurality of sand absorption inclined holes 6.2 are arranged on the outer wall of the sand and liquid absorption pipe body 6.1, and the waste sand liquid and sand and liquid column on the upper part of the hydraulic sandblasting perforating gun 8 are absorbed through the sand absorption inclined holes 6.2.
[0036] The outer wall of the inner tube 3 corresponding to the inside of the sand-liquid absorption pipe 6 is provided with a wear-resistant thickened layer 10 , and the waste sand liquid and sand-liquid liquid column sucked by the sand-absorbing inclined hole 6.2 first touch the wear-resistant thickened layer 10 .
[0037] Reference Figure 4-Figure 5 The hydraulic sandblasting perforating gun 8 mentioned in the present invention comprises a perforating gun body 8.1, a jacket 8.2, a perforating nozzle 8.3, an upper joint 8.4, and a lower joint 8.5. The upper end of the perforating gun body 8.1 is provided with an upper joint 8.4, and the lower end is provided with a lower joint 8.5. More than two groups of perforating nozzles 8.3 are provided in the middle of the perforating gun body 8.1, and the perforating nozzles 8.3 are installed on the outer wall of the perforating gun body 8.1 through the jacket 8.2.
[0038] Reference Figure 6 The perforating nozzle 8.3 mentioned in the present invention includes a nozzle body 8.3.1, an external nozzle 8.3.2, a conical flow channel 8.3.3, and an external thread 8.3.4. The center of the nozzle body 8.3.1 is provided with a conical flow channel 8.3.3 and an external nozzle 8.3.2, the conical flow channel 8.3.3 is located in the inner cavity, and the inner outer wall of the nozzle body 8.3.1 is provided with an external thread 8.3.4, which is movably connected to the sleeve 8.2 through the external thread 8.3.4.
[0039] The method for using the low back pressure deep penetration hydraulic sandblasting perforating device mentioned in the present invention comprises the following process:
[0040] First, lower the pipe string into the well, place the hydraulic sandblasting perforating gun 8 directly at the starting position where sandblasting perforating is required, install the ground well control device, start the ground injection equipment, and inject high-pressure perforating sand liquid into the well according to the design parameters to perform high-pressure sandblasting perforating; a part of the high-pressure perforating sand liquid reaches the hydraulic sandblasting perforating gun 8 along the oil pipe 2 and the core pipe 4.4, and is ejected from the perforating nozzle 8.3 at a high speed, impacting and grinding the penetrating casing 1, cementing cement, and rock in turn, forming a longer hole than the conventional high back pressure perforating; another part of the high-pressure perforating sand liquid flows through the back pressure suction pump 4 through the filter The part of high-pressure water without sand filtered out by the sand pipe 4.9 enters the liquid injection buffer chamber 4.12, and is upwardly injected along the injection section 4.8 of the sandwich wall chamber formed by the core tube 4.4 and the sand pump assembly 4.5, sucking the waste sand liquid and the sand liquid column from the hydraulic sandblasting perforating gun 8, so that the upper part of the hydraulic sandblasting perforating gun 8 presents a low back pressure state, and then, after the high-pressure water is mixed with the waste sand liquid and the sand liquid column, it is upwardly injected along the annular space formed between the oil pipe 2 and the casing 1 to be discharged to the ground, thereby ensuring the high-pressure and high-speed jet of the hydraulic sandblasting perforating gun 8 without submerged back pressure, and injecting a longer hole;
[0041] Secondly, after the first perforation is completed, the surface sand and liquid pump speed is lowered, and the construction pressure is immediately reduced. Then, the pipe string is lifted to the upper section to be perforated, and high-pressure perforating sand and liquid are continuously injected into the well according to the design parameters to carry out the perforation construction of the perforation section.
[0042] Finally, after the perforation is completed, the construction stage of clearing the sand in the well and jetting to remove the blockage is then entered. The operation steps are as follows: shut down the sand adding equipment in the surface injection equipment, start the high-pressure water pump to inject high-pressure and high-displacement power water into the oil pipe 2, a part of the water flow directly goes down to the hydraulic sandblasting perforating gun 8 to perform high-pressure jet flushing on the perforated holes, and the other part of the high-pressure water passes through the sand filter pipe 4.9 of the back pressure suction pump 4 to form a ring spray and draw the return liquid for flushing and lift it to the ground, so that the perforated holes and the blockage in the formation near the well are sucked to the ground, playing the role of negative pressure suction and reverse discharge of the high-pressure jet to remove the blockage.
[0043] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solutions of the present invention shall fall within the scope of protection claimed by the present invention.
Claims
1. A low back pressure deep penetration hydraulic sandblasting perforating device, comprising a hydraulic sandblasting perforating gun (8) and a check valve (9), wherein the hydraulic sandblasting perforating gun (8) is lowered into a location to be perforated in a casing (1) through an oil pipe (2), and the lower part of the hydraulic sandblasting perforating gun (8) is connected to the check valve (9), wherein the device is characterized in that: It also comprises an inner tube (3), a back pressure suction pump (4), a packer (5), a sand liquid absorption pipe (6), and an inner tube packer (7); the upper part of the hydraulic sandblasting perforating gun (8) is connected to the inner tube (3) and the oil pipe (2), and the inner tube packer (7) is installed between the inner tube (3) and the oil pipe (2); the back pressure suction pump (4) is connected to the oil pipe (2) and the upper part of the inner tube (3); the packer (5) is installed between the oil pipe (2) and the casing (1) below the back pressure suction pump (4); the sand liquid absorption pipe (6) is installed on the oil pipe (2) below the packer (5); the upper part of the back pressure suction pump (4) is connected to the core pipe (4.4) and the oil pipe (2); the waste sand liquid and sand liquid column on the upper part of the hydraulic sandblasting perforating gun (8) are sucked away by the back pressure suction pump (4), so that the upper part of the hydraulic sandblasting perforating gun (8) presents a low back pressure state; The back pressure suction pump (4) comprises a liquid outlet (4.1), a diffusion chamber (4.3), a core tube (4.4), a sand pump assembly (4.5), a throat section (4.6), a liquid suction port (4.7), an injection section (4.8), and a sand filter tube (4.9). The upper side of the sand pump assembly (4.5) is provided with a liquid outlet (4.1), a conical diffusion chamber (4.3) is provided below the liquid outlet (4.1), a liquid suction port (4.7) is provided in the middle of the sand pump assembly (4.5), and a liquid injection buffer chamber (4.12) is provided at the lower part of the sand pump assembly (4.5). The inner cavity of the sand pump assembly (4.5) is installed with the core tube (4.4) and the sand filter tube (4.9), and the core tube (4.4) and the middle inner cavity of the sand pump assembly (4.5) form a throat section (4.6) and an injection section (4.8); The upper part of the core tube (4.4) is connected to the top of the sand pump assembly (4.5) through an upper spacer ring (4.11), the lower end of the core tube (4.4) is movably connected to the sand filter tube (4.9), and the lower end of the sand filter tube (4.9) is connected to the bottom of the sand pump assembly (4.5) through a lower spacer ring (4.10).
2. The low back pressure deep penetration hydraulic sandblasting perforating device according to claim 1 is characterized by: The upper outer wall of the sand pump assembly (4.5) is provided with a leather cup seal (4.2).
3. The low back pressure deep penetration hydraulic sandblasting perforating device according to claim 2 is characterized by: The sand-liquid absorption pipe (6) comprises a sand-liquid absorption pipe body (6.1) and a sand-absorbing inclined hole (6.2). A plurality of sand-absorbing inclined holes (6.2) are provided on the outer wall of the sand-liquid absorption pipe body (6.1), and waste sand liquid and a sand-liquid liquid column on the upper part of the hydraulic sandblasting perforating gun (8) are absorbed through the sand-absorbing inclined holes (6.2).
4. The low back pressure deep penetration hydraulic sandblasting perforating device according to claim 3 is characterized by: The outer wall of the inner tube (3) corresponding to the inside of the sand-liquid absorption tube (6) is provided with a wear-resistant thickened layer (10), and the waste sand liquid and the sand-liquid liquid column absorbed by the sand-absorbing inclined hole (6.2) first come into contact with the wear-resistant thickened layer (10).
5. The low back pressure deep penetration hydraulic sandblasting perforating device according to claim 3 or 4, characterized in that: The hydraulic sandblasting perforating gun (8) comprises a perforating gun body (8.1), a jacket (8.2), a perforating nozzle (8.3), an upper joint (8.4), and a lower joint (8.5); the upper end of the perforating gun body (8.1) is provided with an upper joint (8.4), the lower end is provided with a lower joint (8.5), and more than two groups of perforating nozzles (8.3) are provided in the middle of the perforating gun body (8.1), and the perforating nozzles (8.3) are mounted on the outer wall of the perforating gun body (8.1) through the jacket (8.2).
6. The low back pressure deep penetration hydraulic sandblasting perforating device according to claim 5 is characterized by: The perforating nozzle (8.3) comprises a nozzle body (8.3.1), an external nozzle (8.3.2), a conical flow channel (8.3.3), and an external thread (8.3.4). The center of the nozzle body (8.3.1) is provided with a conical flow channel (8.3.3) and an external nozzle (8.3.2), the conical flow channel (8.3.3) is located in the inner cavity, and the inner outer wall of the nozzle body (8.3.1) is provided with an external thread (8.3.4), which is movably connected to the sleeve (8.2) via the external thread (8.3.4).
7. The method for using the low back pressure deep penetration hydraulic sandblasting perforating device according to claim 6 is characterized by: The process includes: First, the tubing string is lowered into the well, the hydraulic sandblasting perforating gun (8) is positioned at the starting position where sandblasting perforating is required, the surface well control device is installed, the surface injection equipment is started, and high-pressure perforating sand liquid is injected into the well according to the design parameters to perform high-pressure sandblasting perforating; a part of the high-pressure perforating sand liquid flows along the oil pipe (2) and the core pipe (4.4) to the hydraulic sandblasting perforating gun (8), and is ejected from the perforating nozzle (8.3) at a high speed, impacting and grinding the casing (1), cementing cement, and rock in turn, forming a longer hole than conventional high back pressure perforating; another part of the high-pressure perforating sand liquid flows through the back pressure suction pump (4), passes through the sand filter pipe ( 4.9) The filtered part of the high-pressure water without sand enters the liquid injection buffer chamber (4.12), and is sprayed upward along the injection section (4.8) of the sandwich wall chamber formed by the core tube (4.4) and the sand pump assembly (4.5), sucking the waste sand liquid and the sand liquid column from the hydraulic sandblasting perforating gun (8), so that the upper part of the hydraulic sandblasting perforating gun (8) presents a low back pressure state, and then, after the high-pressure water is mixed with the waste sand liquid and the sand liquid column, it is upward along the annular space formed between the oil pipe (2) and the casing (1) to be discharged to the ground, thereby ensuring that the hydraulic sandblasting perforating gun (8) has a high-pressure and high-speed jet under the condition of no submerged back pressure, and shoots a longer hole; Secondly, after the first perforation is completed, the surface sand and liquid pump speed is lowered, and the construction pressure is immediately reduced. Then, the pipe string is lifted to the upper section to be perforated, and high-pressure perforating sand and liquid are continuously injected into the well according to the design parameters to carry out the perforation construction of the perforation section. Finally, after the perforation is completed, the well is turned to the construction stage of clearing the sand accumulation and jetting to remove the blockage. The operation steps are as follows: shut down the sand adding equipment in the surface injection equipment, start the high-pressure water pump to inject high-pressure and high-displacement power water into the oil pipe (2), a part of the water flows directly downward to the hydraulic sandblasting perforating gun (8) to perform high-pressure jet flushing on the perforated holes, and the other part of the high-pressure water passes through the sand filter pipe (4.9) of the back pressure suction pump (4) to form a ring spray and draw the return fluid of the flushing and lift it to the ground, so that the perforated holes and the blockage in the formation near the well are sucked to the ground, playing the role of negative pressure suction and reverse drainage of the high-pressure jet.
Citation Information
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