Self-anchored deep-penetration sandblasting perforating and plugging-removing integrated device and use method

Abstract

The present invention relates to the technical field of perforation completion and reservoir transformation, and in particular to a self-anchored deep-penetration sandblasting perforation and unblocking integrated device and a method of use. The technical scheme is as follows: an upper leather cup and a lower anchoring leather cup are provided on the middle and lower outer walls of the outer tube of the pump body, a hydraulic self-anchor is provided between the upper leather cup and the lower anchoring leather cup, a perforation nozzle is provided on the lower side of the lower anchoring leather cup, and a return sand liquid inlet is provided at the bottom of the outer tube of the pump body; a sand filter flow divider is provided on the top of the central tube assembly, the middle of the central tube assembly is connected to the outer tube of the pump body through a bridge-type flow guide, a nozzle, a diffusion chamber and a mixed liquid discharge flow channel are formed between the pump core and the inner wall of the central tube assembly, and the lower end of the mixed liquid discharge flow channel is connected to the mixed liquid outlet. The beneficial effects are: not only can the anti-creep function during sandblasting perforation be realized, but also deep-penetration sandblasting perforation can be realized, and the ejected hole wall surface is smooth and regular to avoid damaging the casing; it is easy to operate, simple and reliable in construction, and economical and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of perforation completion and reservoir transformation, and in particular to a self-anchored deep-penetration sandblasting perforating and unblocking integrated device and a use method thereof. Background Art

[0002] In the process of oil and gas field development, hydraulic sandblasting perforation has the advantage of greater penetration depth than ammunition perforation. The existing hydraulic sandblasting perforation devices and technologies have the following problems: first, the perforating gun body may damage the casing due to the creeping and rotation of the pipe string, the perforation depth may be insufficient, and the perforation sand liquid may leak and pollute the low-pressure formation; the existing anti-creeping pipe string anchoring device may be easily stuck by the sand-containing liquid flow sand, which may cause a large construction risk and cannot meet the needs of anti-creeping sandblasting perforation; second, the existing sandblasting perforation is performed under the high flooding pressure of the oil casing annulus, the net jet pressure difference and the jet speed are low, the perforation depth is insufficient, and it is difficult to increase the perforation depth by increasing the jet pressure due to the limitation of the pressure bearing capacity of the wellhead and the pipe string; third, most wells need to be lowered into a deblocking pipe string after sandblasting perforation to clear sand and deblock the perforation blasthole and the formation, which leads to a long construction period and high cost.

[0003] The patent application number of our company is 2024113012284, and the patent name is "Low back pressure deep penetration hydraulic sandblasting perforating device and use method". Its technical solution is: including inner tube, back pressure suction pump, packer, sand liquid absorption pipe, inner tube packer, the upper part of hydraulic sandblasting perforating gun is connected to inner tube and oil pipe, the back pressure suction pump is connected to the upper part of oil pipe and inner tube, the packer is installed between oil pipe and casing below the back pressure suction pump, the sand liquid absorption pipe is installed on the oil pipe below the packer, and the upper part of back pressure suction pump is connected to oil pipe. This invention realizes the effective amplification of jet pressure difference without increasing the ground power hydraulic pressure, thereby greatly increasing the perforation hole length and perforation depth, which can not only penetrate the near-well contaminated zone but also increase the permeability of deep reservoirs, which can fundamentally improve the quality of sandblasting perforation and post-shooting production effect. This invention has the advantage of greater perforation penetration than the prior art, but it has the following problems: during the perforation process, it still lacks the anchoring function for the perforating tool and the tubing, and the creeping construction tubing affects the perforation quality and easily damages the casing, which is particularly significant for deep wells and high-angle wells. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned defects in the prior art and to provide a self-anchored deep-penetration sandblasting perforating and unblocking integrated device and a method of use, which can not only realize the anti-creeping function during sandblasting perforating, but also realize deep-penetration sandblasting perforating. The perforation wall surface is smooth and regular, avoiding the problem that the creeping construction pipe column affects the perforation quality and damages the casing.

[0005] The present invention mentions a self-anchored deep-penetration sandblasting perforating and unblocking integrated device, and its technical solution is: it includes a pump body outer tube, a central tube assembly, and a pump core. The central tube assembly is provided in the inner cavity of the pump body outer tube, and the pump core is installed in the inner cavity of the central tube assembly, wherein it also includes a sand filter flow divider, a bridge-type guide, an upper leather bowl, a sand-containing jet liquid flow channel, a perforating return liquid flow channel, a hydraulic self-anchor, a lower anchor leather bowl, a perforating nozzle, and a single-flow valve. The middle and lower outer walls of the pump body outer tube are provided with an upper leather bowl and a lower anchor leather bowl, a bridge-type guide and a mixed liquid outlet are provided on the upper side of the upper leather bowl, and a hydraulic self-anchor is provided between the upper leather bowl and the lower anchor leather bowl. A perforation nozzle is provided on the lower side of the lower anchoring leather cup, and a return sand liquid inlet is provided at the bottom of the outer tube of the pump body; a sand filter flow divider is provided on the top of the central tube assembly, the middle part of the central tube assembly is connected to the outer tube of the pump body through a bridge-type flow guide, a check valve is provided at the bottom of the central tube assembly, and the lower part of the check valve is connected to the return sand liquid inlet; a sand-containing jet liquid flow channel is formed between the central tube assembly and the outer tube of the pump body, a perforation return liquid flow channel is provided on one side of the inner wall of the central tube assembly, a nozzle, a diffusion chamber and a mixed liquid discharge flow channel are formed between the pump core and the inner wall of the central tube assembly, and the lower end of the mixed liquid discharge flow channel is connected to the mixed liquid outlet.

[0006] Preferably, the above-mentioned hydraulic self-anchor includes a pressure cap, a plunger claw, a disc spring, a sealing ring and an anchoring body. The anchoring body is installed on the outer wall of the outer tube of the pump body, a sealing ring is provided between the anchoring body and the outer tube of the pump body, a pressure cap is installed on the outer side of the anchoring body, and a disc spring is installed between the front end of the anchoring body and the pressure cap. A plunger claw is provided at the outer end of the anchoring body, and it is anchored to the casing wall in the well through the plunger claw.

[0007] Preferably, the above-mentioned sand filter flow divider includes a sand filter cap body, a filter slit, a sand filter tube body, a lower joint, and a sand filter hole. The sand filter tube body is a cylindrical structure, a sand filter cap body with a conical structure is provided on the top of the sand filter tube body, and a lower joint is provided on the bottom of the sand filter tube body, which is connected to the top of the central pipe assembly through the lower joint; a plurality of filter slits are evenly distributed on the outer wall of the sand filter tube body, and a plurality of sand filter holes are evenly distributed on the sand filter cap body.

[0008] Preferably, the upper leather cup is mounted on an upper fixed platform, and the lower anchoring leather cup is mounted on a lower fixed platform.

[0009] The method for using the self-anchored deep-penetration sandblasting perforating and unblocking integrated device mentioned in the present invention comprises the following process:

[0010] First, the high-pressure sand-containing power fluid on the ground is sent to the sand filter diverter in the well through the oil pipe. The part of the high-pressure water filtered out by the sand filter diverter enters the annular gap between the pump core and the central pipe assembly, and the perforation return fluid from the lower perforation return fluid channel is sucked out by the nozzle with high-speed jet injection, and the sand-containing power fluid is sprayed downward along the sand-containing jet fluid flow channel at the perforation nozzle to realize deep penetration hydraulic sandblasting perforation operation; while perforating, the sand-containing power fluid pushes the anchor body of the hydraulic self-anchor, and the plunger cat claw clamps the casing wall to anchor the construction pipe string to prevent creep, so that the perforation nozzle and the casing wall have no relative displacement. High-pressure and high-speed perforation is achieved, ensuring the perforation quality;

[0011] Secondly, the mixed liquid from the diffusion chamber and the mixed liquid discharge channel is sent to the annulus between the outer tube of the pump body and the casing through the bridge guide and the mixed liquid outlet, so that the sand-containing perforating liquid is discharged from the ground; when the perforating of a section is completed, the speed of the sand-containing power liquid pumped into the ground is reduced, and the hydraulic self-anchor retracts under the spring force of the internal disc spring, first releasing the anchoring to the casing wall, and then moving the pipe string to another perforating section, repeating the above operation, the sandblasting perforation can be performed in sections, and the operation is repeated section by section until the perforation of the designed well section is completed;

[0012] Finally, after the perforation of all designed well sections is completed, stop adding sand to the power fluid on the ground, increase the speed of power fluid injection, move the tubing string to perform sand-free jet flushing of the blasthole and clean the near-well formation. At this time, the perforating nozzle produces hydraulic impact, shear, and vibration on the perforating blasthole and formation to remove the sand and silt accumulated in the hole, thus avoiding the operation of starting the tubing string for the next unblocking.

[0013] The second self-anchored deep-penetration sandblasting perforating and unblocking integrated device mentioned in the present invention has the following technical solution: it includes a pump body outer tube, a center tube assembly, and a pump core. The center tube assembly is provided in the inner cavity of the pump body outer tube, and the pump core is installed in the inner cavity of the center tube assembly. It also includes a sand filter flow divider, a bridge-type guide, an upper leather bowl, a sand-containing jet liquid flow channel, a perforating return liquid flow channel, a perforating nozzle, a single-flow valve and a pressure-controlled self-anchor. The middle and lower outer walls of the pump body outer tube are provided with an upper leather bowl and a pressure-controlled self-anchor. A bridge-type guide and a mixed liquid outlet are provided on the upper side of the upper leather bowl, and a pressure-controlled self-anchor is installed on the lower side of the upper leather bowl. A perforating nozzle is provided on the lower side of the anchor, and a sand return liquid inlet is provided at the bottom of the outer tube of the pump body; a sand filter flow divider is provided on the top of the central tube assembly, the middle part of the central tube assembly is connected to the outer tube of the pump body through a bridge-type flow guide, a check valve is provided at the bottom of the central tube assembly, and the lower part of the check valve is connected to the sand return liquid inlet; a sand-containing jet liquid flow channel is formed between the central tube assembly and the outer tube of the pump body, a perforating liquid return flow channel is provided on one side of the inner wall of the central tube assembly, a nozzle, a diffusion chamber and a mixed liquid discharge flow channel are formed between the pump core and the inner wall of the central tube assembly, and the lower end of the mixed liquid discharge flow channel is connected to the mixed liquid outlet.

[0014] Preferably, the above-mentioned pressure-controlled self-anchoring device includes an outer tube limit platform, an expansion anchoring rubber ring, a wear-resistant anchoring tooth ring, a vulcanized elastic rib, a slip ring, and a sliding leather cup. More than one group of expansion anchoring rubber rings are arranged under the outer tube limit platform. The outer end of the expansion anchoring rubber ring is provided with a wear-resistant anchoring tooth ring for contacting and anchoring with the casing wall; the interior of the expansion anchoring rubber ring is provided with a vulcanized elastic rib for supporting; a slip ring is installed on the lower side of the expansion anchoring rubber ring, and the sliding leather cup is fixed on the slip ring.

[0015] Preferably, the inner end of the above-mentioned expansion anchor rubber ring is communicated with a pressure transmission through hole provided on the outer tube of the pump body, and a sand filter ring net is provided on the inner wall of the outer tube of the pump body.

[0016] Preferably, a spacing limit platform is provided at the lower side of the outer tube limit platform, a group of expansion anchoring rubber rings are provided at the upper side of the spacing limit platform, and a group of expansion anchoring rubber rings and sliding rings are provided at the lower side of the spacing limit platform.

[0017] The method for using the self-anchored deep-penetration sandblasting perforating and unblocking integrated device mentioned in the present invention comprises the following process:

[0018] First, the high-pressure sand-containing power fluid on the ground is sent to the sand filter diverter in the well through the oil pipe. Part of the high-pressure water filtered out by the sand filter diverter enters the annular gap between the pump core and the central pipe assembly, and the perforation return fluid from the lower perforation return fluid channel is sucked out by the nozzle with high-speed jet injection, while the sand-containing power fluid is sprayed downward along the sand-containing jet fluid flow channel at the perforation nozzle to realize deep-penetration hydraulic sandblasting perforation operation; while perforating, the sand-containing power fluid pushes out the expansion anchoring rubber ring of the pressure-controlled self-anchor, and clamps the casing wall through the wear-resistant anchoring tooth ring to prevent the construction pipe string from creeping, so that the perforation nozzle and the casing wall have no relative displacement. High-pressure and high-speed perforation is achieved, ensuring the perforation quality;

[0019] Secondly, the mixed liquid from the diffusion chamber and the mixed liquid discharge channel is sent to the annulus between the outer tube of the pump body and the casing through the bridge guide and the mixed liquid outlet, so that the sand-containing perforating liquid is discharged from the ground; when the perforation of a section is completed, the speed of the sand-containing power liquid pumped into the ground is reduced, and the pressure-controlled self-anchor retracts under the action of the internal vulcanized elastic ribs, first releasing the anchoring of the casing wall, and then moving the pipe string to another perforating section. Repeating the above operation, the sandblasting perforation can be performed in sections, and the operation is repeated section by section until the perforation of the designed well section is completed;

[0020] Finally, after the perforation of all designed well sections is completed, stop adding sand to the power fluid on the ground, increase the speed of power fluid injection, move the tubing string to perform sand-free jet flushing of the blasthole and clean the near-well formation. At this time, the perforating nozzle produces hydraulic impact, shear, and vibration on the perforating blasthole and formation to remove the sand and silt accumulated in the hole, thus avoiding the operation of starting the tubing string for the next unblocking.

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

[0022] 1. The present invention performs high-pressure hydraulic anchoring sandblasting perforation while sucking the perforation return fluid under negative pressure. It is an ultra-high-speed jet perforation under low confining pressure conditions, which greatly improves the jet pressure difference and speed. The perforation depth is greatly improved compared with the existing perforation process and device. It can also achieve the anti-creep function during sandblasting perforation, so that the perforation wall surface is smooth and regular, and the perforation fluid is prevented from infiltrating and clogging the formation. The effect is particularly significant for sensitive formations, deep wells and ultra-deep wells;

[0023] 2. The present invention uses a hydraulic self-anchor or a pressure-controlled self-anchor to realize sandblasting perforation under the condition of self-anchored pipe string, realizes the anti-creep function, and the retractable and sliding anchor avoids contact with sand particles, effectively avoiding the sand blocking phenomenon that has been difficult to solve in the industry for a long time, protecting the casing from damage to the casing due to pipe string creep and the phenomenon of insufficient perforation hole quality, effectively ensuring construction safety and hole quality, and having simple operation, simple and reliable construction, and economical and efficient operation;

[0024] 3. The inner flow channel formed by the pump core and the center tube assembly of the present invention is a streamlined structure, and the surface is coated with a hardened anti-wear layer. It has excellent self-sand plugging prevention and anti-wear performance, large negative pressure suction force and high reliability. It is more suitable for applications in perforating fluids with difficult to stabilize sand content, large differences in reservoir physical properties, and low-pressure leakage wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the sand filter body of the present invention;

[0027] Figure 3 It is a structural schematic diagram of a hydraulic self-anchor;

[0028] Figure 4 is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0029] Figure 5 is a schematic diagram of the structure of a pressure-controlled self-anchor;

[0030] In the figure above: pump body tube 1, center tube assembly 2, pump core 3, sand filter flow divider 4, bridge guide 5, mixed liquid outlet 6, upper leather bowl 7, sand-containing jet liquid flow channel 8, perforation return liquid flow channel 9, hydraulic self-anchor 10, lower anchor leather bowl 11, perforation nozzle 12, check valve 13, return sand liquid inlet 14, nozzle 15, diffusion chamber 16, mixed liquid discharge flow channel 17, upper fixing platform 18, lower fixing platform 19, pressure-controlled self-anchor 20;

[0031] Sand filter cap body 4.1, filter seam 4.2, sand filter tube body 4.3, lower joint 4.4, sand filter hole 4.5;

[0032] Pressure cap 10.1, plunger claw 10.2, disc spring 10.3, sealing ring 10.4, anchor body 10.5;

[0033] Outer tube limit table 20.1, sand filter ring net 20.2, expansion anchor rubber ring 20.3, wear-resistant anchor tooth ring 20.4, vulcanized elastic rib 20.5, pressure transmission through hole 20.6, slip ring 20.7, sliding leather cup 20.8, interval limit table 20.9. DETAILED DESCRIPTION

[0034] 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.

[0035] Example 1, reference Figure 1-Figure 3 The present invention mentions a self-anchored deep-penetration sandblasting perforating and unblocking integrated device, comprising a pump body outer tube 1, a central tube assembly 2, and a pump core 3. The central tube assembly 2 is provided in the inner cavity of the pump body outer tube 1, and the pump core 3 is installed in the inner cavity of the central tube assembly 2, wherein the device also includes a sand filter flow divider 4, a bridge-type flow guide 5, an upper leather bowl 7, a sand-containing jet liquid flow channel 8, a perforation return liquid flow channel 9, a hydraulic self-anchor 10, a lower anchor leather bowl 11, a perforating nozzle 12, and a check valve 13. The middle and lower outer walls of the pump body outer tube 1 are provided with an upper leather bowl 7 and a lower anchor leather bowl 11, a bridge-type flow guide 5 and a mixed liquid outlet 6 are provided on the upper side of the upper leather bowl 7, a hydraulic self-anchor 10 is provided between the upper leather bowl 7 and the lower anchor leather bowl 11, and the lower anchor leather bowl 11 is provided with a A perforating nozzle 12 is provided on the lower side, and a sand return liquid inlet 14 is provided at the bottom of the outer tube 1 of the pump body; a sand filter flow divider 4 is provided on the top of the central tube assembly 2, the middle part of the central tube assembly 2 is connected to the outer tube 1 of the pump body through a bridge-type flow guide 5, a check valve 13 is provided at the bottom of the central tube assembly 2, and the lower part of the check valve 13 is connected to the sand return liquid inlet 14; a sand-containing jet liquid flow channel 8 is formed between the central tube assembly 2 and the outer tube 1 of the pump body, a perforating liquid return flow channel 9 is provided on one side of the inner wall of the central tube assembly 2, a nozzle 15, a diffusion chamber 16 and a mixed liquid discharge flow channel 17 are formed between the pump core 3 and the inner wall of the central tube assembly 2, and a hardened anti-wear layer is coated on the surface, and the lower end of the mixed liquid discharge flow channel 17 is connected to the mixed liquid outlet 6.

[0036] Reference Figure 3The hydraulic self-anchor 10 mentioned in the present invention includes a pressure cap 10.1, a plunger claw 10.2, a disc spring 10.3, a sealing ring 10.4 and an anchor body 10.5. The anchor body 10.5 is installed on the outer wall of the outer tube 1 of the pump body, and a sealing ring 10.4 is provided between the anchor body 10.5 and the outer tube 1 of the pump body. The pressure cap 10.1 is installed on the outer side of the anchor body 10.5, and a disc spring 10.3 is installed between the front end of the anchor body 10.5 and the pressure cap 10.1. A plunger claw 10.2 is provided at the outer end of the anchor body 10.5, and the plunger claw 10.2 is anchored to the casing wall in the well.

[0037] Reference Figure 2 The sand filter flow divider 4 mentioned in the present invention includes a sand filter cap body 4.1, a filter slit 4.2, a sand filter tube body 4.3, a lower joint 4.4, and a sand filter hole 4.5. The sand filter tube body 4.3 is a cylindrical structure, and a conical sand filter cap body 4.1 is provided on the top of the sand filter tube body 4.3, and a lower joint 4.4 is provided on the bottom of the sand filter tube body 4.3, which is connected to the top of the central pipe assembly 2 through the lower joint 4.4; a plurality of filter slits 4.2 are evenly distributed on the outer wall of the sand filter tube body 4.3, and a plurality of sand filter holes 4.5 are evenly distributed on the sand filter cap body 4.1.

[0038] In addition, the upper leather cup 7 is mounted on the upper fixing platform 18 , and the lower anchoring leather cup 11 is mounted on the lower fixing platform 19 .

[0039] The method for using the self-anchored deep-penetration sandblasting perforating and unblocking integrated device mentioned in the present invention comprises the following process:

[0040] First, the high-pressure sand-containing power fluid on the ground is sent to the sand filter diverter 4 in the well through the oil pipe. The part of the high-pressure water filtered out by the sand filter diverter 4 enters the annular gap between the pump core 3 and the central pipe assembly 2, and the perforation return fluid from the lower perforation return fluid channel 9 is sucked by the nozzle 15 with high-speed jet injection, and the sand-containing power fluid is sprayed downward along the sand-containing jet fluid flow channel 8 at the perforation nozzle 12 to realize deep penetration hydraulic sandblasting perforation operation; while perforating, the sand-containing power fluid pushes out the anchor body 10.5 of the hydraulic self-anchor 10, and clamps the casing wall through the plunger cat claw 10.2 to anchor the construction pipe string to prevent creep, so that the perforation nozzle 12 and the casing wall are perforated with high pressure and high speed without relative displacement, thereby ensuring the perforation quality;

[0041] Secondly, the mixed liquid from the diffusion chamber 16 and the mixed liquid discharge channel 17 is sent to the annulus between the outer tube 1 of the pump body and the casing through the bridge guide 5 and the mixed liquid outlet 6, so that the sand-containing perforating liquid is discharged from the ground; when the perforating of a section is completed, the speed of the sand-containing power liquid pumped into the ground is reduced, and the hydraulic self-anchor 10 retracts under the spring force of the internal disc spring 10.3, first releasing the anchoring to the casing wall, and then moving the pipe string to another perforating section, repeating the above operation, the sandblasting perforation can be performed in sections, and the operation is repeated section by section until the perforation of the designed well section is completed;

[0042] Finally, after the perforation of all designed well sections is completed, stop adding sand to the power fluid on the ground, increase the speed of injecting the power fluid, move the pipe string to perform sand-free jet flushing of the blasthole and clean the near-well formation. At this time, the perforating nozzle 12 produces hydraulic impact, shearing and vibration on the perforating blasthole and the formation to remove the sand and silt accumulated in the hole, thereby avoiding the operation of starting the next unblocking pipe string.

[0043] Example 2, reference Figure 4 and Figure 5 The second self-anchored deep-penetration sandblasting perforating and unblocking integrated device mentioned in the present invention comprises a pump body outer tube 1, a central tube assembly 2, and a pump core 3. The central tube assembly 2 is provided in the inner cavity of the pump body outer tube 1, and the pump core 3 is installed in the inner cavity of the central tube assembly 2, wherein it also comprises a sand filter flow divider 4, a bridge-type guide 5, an upper leather bowl 7, a sand-containing jet liquid flow channel 8, a perforation return liquid flow channel 9, a perforation nozzle 12, a check valve 13 and a pressure-controlled self-anchor 20. The upper leather bowl 7 and the pressure-controlled self-anchor 20 are provided on the outer wall of the middle and lower parts of the pump body outer tube 1, a bridge-type guide 5 and a mixed liquid outlet 6 are provided on the upper side of the upper leather bowl 7, and the pressure-controlled self-anchor 20 is installed on the lower side of the upper leather bowl 7. A perforating nozzle 12 is provided on the lower side, and a sand return liquid inlet 14 is provided at the bottom of the outer tube 1 of the pump body; a sand filter flow divider 4 is provided on the top of the central tube assembly 2, the middle part of the central tube assembly 2 is connected to the outer tube 1 of the pump body through a bridge-type flow guide 5, a check valve 13 is provided at the bottom of the central tube assembly 2, and the lower part of the check valve 13 is connected to the sand return liquid inlet 14; a sand-containing jet liquid flow channel 8 is formed between the central tube assembly 2 and the outer tube 1 of the pump body, a perforating return liquid flow channel 9 is provided on one side of the inner wall of the central tube assembly 2, a nozzle 15, a diffusion chamber 16 and a mixed liquid discharge flow channel 17 are formed between the pump core 3 and the inner wall of the central tube assembly 2, and the lower end of the mixed liquid discharge flow channel 17 is connected to the mixed liquid outlet 6.

[0044] Reference Figure 5The pressure-controlled self-anchoring device 20 mentioned in the present invention includes an outer tube limit platform 20.1, an expansion anchoring rubber ring 20.3, a wear-resistant anchoring tooth ring 20.4, a vulcanized elastic rib 20.5, a slip ring 20.7, and a sliding leather cup 20.8. One or more expansion anchoring rubber rings 20.3 are arranged under the outer tube limit platform 20.1. The outer end of the expansion anchoring rubber ring 20.3 is provided with a wear-resistant anchoring tooth ring 20.4 for contacting and anchoring with the casing wall; the interior of the expansion anchoring rubber ring 20.3 is provided with a vulcanized elastic rib 20.5 for supporting; a slip ring 20.7 is installed on the lower side of the expansion anchoring rubber ring 20.3, and a sliding leather cup 20.8 is fixed on the slip ring 20.7.

[0045] The inner end of the expansion anchor rubber ring 20.3 is communicated with the pressure transmission through hole 20.6 provided on the outer tube 1 of the pump body, and a sand filter ring net 20.2 is provided on the inner wall of the outer tube 1 of the pump body.

[0046] A spacing limit platform 20.9 is provided at the lower side of the outer tube limit platform 20.1, a group of expansion anchoring rubber rings 20.3 are provided at the upper side of the spacing limit platform 20.9, and a group of expansion anchoring rubber rings 20.3 and a sliding ring 20.7 are provided at the lower side of the spacing limit platform 20.9.

[0047] In addition, refer to Figure 2 The sand filter flow divider 4 mentioned in the present invention has the same structure as that of Example 1, including a sand filter cap body 4.1, a filter slit 4.2, a sand filter tube body 4.3, a lower joint 4.4, and a sand filter hole 4.5. The sand filter tube body 4.3 is a cylindrical structure, and a conical sand filter cap body 4.1 is provided on the top of the sand filter tube body 4.3, and a lower joint 4.4 is provided on the bottom of the sand filter tube body 4.3, which is connected to the top of the central pipe assembly 2 through the lower joint 4.4; a plurality of filter slits 4.2 are evenly distributed on the outer wall of the sand filter tube body 4.3, and a plurality of sand filter holes 4.5 are evenly distributed on the sand filter cap body 4.1.

[0048] The method for using the self-anchored deep-penetration sandblasting perforating and unblocking integrated device mentioned in the present invention comprises the following process:

[0049] First, the high-pressure sand-containing power fluid on the ground is sent to the sand filter flow divider 4 in the well through the oil pipe. The part of the high-pressure water filtered out by the sand filter flow divider 4 enters the annular gap between the pump core 3 and the central pipe assembly 2, and the perforation return fluid from the lower perforation return fluid channel 9 is sucked by the nozzle 15 with high-speed jet injection, and the sand-containing power fluid is sprayed downward along the sand-containing jet fluid flow channel 8 at the perforation nozzle 12 to realize deep penetration hydraulic sandblasting perforation operation; while perforating, the sand-containing power fluid pushes out the expansion anchoring rubber ring 20.3 of the pressure-controlled self-anchor 20, and clamps the casing wall through the wear-resistant anchoring tooth ring 20.4 to prevent the construction pipe string from creeping, so that the high-pressure and high-speed perforation is achieved without relative displacement between the perforation nozzle 12 and the casing wall, thereby ensuring the perforation quality;

[0050] Secondly, the mixed liquid from the diffusion chamber 16 and the mixed liquid discharge channel 17 is sent to the annulus between the outer tube 1 of the pump body and the casing through the bridge guide 5 and the mixed liquid outlet 6, so that the sand-containing perforating liquid is discharged from the ground; when the perforating of one section is completed, the speed of the sand-containing power liquid pumped into the ground is reduced, and the pressure-controlled self-anchor 20 is retracted under the action of the internal vulcanized elastic rib 20.5, first releasing the anchoring of the casing wall, and then moving the pipe string to another perforating section, repeating the above operation, the sandblasting perforation can be performed in sections, and the operation is repeated section by section until the perforation of the designed well section is completed;

[0051] Finally, after the perforation of all designed well sections is completed, stop adding sand to the power fluid on the ground, increase the speed of injecting the power fluid, move the pipe string to perform sand-free jet flushing of the blasthole and clean the near-well formation. At this time, the perforating nozzle 12 produces hydraulic impact, shearing and vibration on the perforating blasthole and the formation to remove the sand and silt accumulated in the hole, thereby avoiding the operation of starting the next unblocking pipe string.

[0052] 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 self-anchored deep-penetration sandblasting perforating and unblocking integrated device, comprising a pump body outer tube (1), a central tube assembly (2), and a pump core (3), wherein the central tube assembly (2) is provided in the inner cavity of the pump body outer tube (1), and the pump core (3) is installed in the inner cavity of the central tube assembly (2), wherein: It also includes a sand filter flow divider (4), a bridge-type flow guide (5), an upper leather bowl (7), a sand-containing jet fluid flow channel (8), a perforation return fluid flow channel (9), a hydraulic self-anchor (10), a lower anchor leather bowl (11), a perforation nozzle (12), and a check valve (13). The middle and lower outer walls of the pump body outer tube (1) are provided with an upper leather bowl (7) and a lower anchor leather bowl (11). The upper side of the upper leather bowl (7) is provided with a bridge-type flow guide (5) and a mixed liquid outlet (6). A hydraulic self-anchor (10) is provided between the upper leather bowl (7) and the lower anchor leather bowl (11). The lower side of the lower anchor leather bowl (11) is provided with a perforation nozzle (12). The bottom of the pump body outer tube (1) is provided with a return sand liquid inlet (14). A sand filter flow divider (4) is provided at the top of the central tube assembly (2), the middle of the central tube assembly (2) is connected to the outer tube (1) of the pump body via a bridge-type flow guide (5), a check valve (13) is provided at the bottom of the central tube assembly (2), and the lower part of the check valve (13) is communicated with a sand return liquid inlet (14); a sand-containing jet liquid flow channel (8) is formed between the central tube assembly (2) and the outer tube (1) of the pump body, a perforation return liquid flow channel (9) is provided on one side of the inner wall of the central tube assembly (2), a nozzle (15), a diffusion chamber (16) and a mixed liquid discharge flow channel (17) are formed between the pump core (3) and the inner wall of the central tube assembly (2), and the lower end of the mixed liquid discharge flow channel (17) is communicated with the mixed liquid outlet (6); The hydraulic self-anchor (10) comprises a pressure cap (10.1), a plunger claw (10.2), a disc spring (10.3), a sealing ring (10.4) and an anchor body (10.5). The anchor body (10.5) is installed on the outer wall of the pump body outer tube (1), a sealing ring (10.4) is provided between the anchor body (10.5) and the pump body outer tube (1), a pressure cap (10.1) is installed on the outer side of the anchor body (10.5), and a disc spring (10.3) is installed between the front end of the anchor body (10.5) and the pressure cap (10.1), and a plunger claw (10.2) is provided at the outer end of the anchor body (10.5), and the anchor body is anchored to the casing wall in the well through the plunger claw (10.2).

2. The self-anchored deep-penetration sandblasting perforating and unblocking integrated device according to claim 1 is characterized by: The sand filter flow divider (4) comprises a sand filter cap body (4.1), a filter slit (4.2), a sand filter tube body (4.3), a lower joint (4.4), and a sand filter hole (4.5). The sand filter tube body (4.3) is a cylindrical structure. A sand filter cap body (4.1) with a conical structure is provided at the top of the sand filter tube body (4.3). A lower joint (4.4) is provided at the bottom of the sand filter tube body (4.3) and is connected to the top of the central tube assembly (2) via the lower joint (4.4). A plurality of filter slits (4.2) are evenly distributed on the outer wall of the sand filter tube body (4.3), and a plurality of sand filter holes (4.5) are evenly distributed on the sand filter cap body (4.1).

3. The self-anchored deep-penetration sandblasting perforating and unblocking integrated device according to claim 2 is characterized by: The upper leather cup (7) is mounted on an upper fixing platform (18), and the lower anchoring leather cup (11) is mounted on a lower fixing platform (19).

4. The method for using the self-anchored deep-penetration sandblasting perforating and unblocking device according to claim 3 is characterized by: The process includes: First, the high-pressure sand-containing power fluid on the ground is sent to the sand filter diverter (4) in the well through the oil pipe. The part of the high-pressure water filtered out by the sand-containing power fluid through the sand filter diverter (4) enters the annular gap between the pump core (3) and the central pipe assembly (2). The perforation return fluid from the lower perforation return fluid channel (9) is sucked out by the nozzle (15) with high-speed jet injection, and the sand-containing power fluid is sprayed downward along the sand-containing jet fluid flow channel (8) at the perforation nozzle (12) to realize deep-penetration hydraulic sandblasting perforation operation. At the same time as perforation, the sand-containing power fluid pushes out the anchor body (10.5) of the hydraulic self-anchor (10), and clamps the casing wall through the plunger cat claw (10.2) to prevent the construction pipe string from creeping, so that the perforation nozzle (12) and the casing wall are subjected to high-pressure and high-speed perforation without relative displacement, thereby ensuring the perforation quality. Secondly, the mixed liquid from the diffusion chamber (16) and the mixed liquid discharge channel (17) is sent to the annulus between the outer tube (1) of the pump body and the casing through the bridge guide (5) and the mixed liquid outlet (6), so that the sand-containing perforating liquid is discharged from the ground; when the perforating of a section is completed, the speed of the sand-containing power liquid pumped into the ground is reduced, and the hydraulic self-anchor (10) retracts under the spring force of the internal disc spring (10.3), first releasing the anchoring to the casing wall, and then moving the pipe string to another perforating section, and repeating the above operation, the sandblasting perforation can be carried out in sections, and the operation is repeated section by section until the perforation of the designed well section is completed; Finally, after the perforation of all the designed well sections is completed, the surface is stopped to add sand to the power fluid, the speed of injecting the power fluid is increased, and the pipe string is moved to perform jet flushing of the blasthole without adding sand and clean the near-wellbore formation. At this time, the perforating nozzle (12) exerts hydraulic impact, shearing and vibration on the perforated blasthole and the formation to remove the sand and silt accumulated in the hole, thereby avoiding the operation of starting the pipe string for the next unblocking.

5. A self-anchored deep-penetration sandblasting perforating and unblocking integrated device, comprising a pump body outer tube (1), a central tube assembly (2), and a pump core (3), wherein the central tube assembly (2) is provided in the inner cavity of the pump body outer tube (1), and the pump core (3) is installed in the inner cavity of the central tube assembly (2), wherein: The pump body assembly (2) further comprises a sand filter flow divider (4), a bridge-type flow guide (5), an upper cup (7), a sand-containing jet fluid flow channel (8), a perforation return fluid flow channel (9), a perforation nozzle (12), a check valve (13) and a pressure-controlled self-anchor (20). The middle and lower outer walls of the pump body outer tube (1) are provided with an upper cup (7) and a pressure-controlled self-anchor (20). The upper side of the upper cup (7) is provided with a bridge-type flow guide (5) and a mixed fluid outlet (6). The lower side of the upper cup (7) is provided with a pressure-controlled self-anchor (20). The lower side of the pressure-controlled self-anchor (20) is provided with a perforation nozzle (12). The bottom of the pump body outer tube (1) is provided with a return sand fluid inlet (14). The central tube assembly (2) A sand filter flow divider (4) is provided at the top, the middle of the central tube assembly (2) is connected to the outer tube (1) of the pump body through a bridge-type flow guide (5), a check valve (13) is provided at the bottom of the central tube assembly (2), and the lower part of the check valve (13) is communicated with the sand return liquid inlet (14); a sand-containing jet liquid flow channel (8) is formed between the central tube assembly (2) and the outer tube (1) of the pump body, a perforation return liquid flow channel (9) is provided on one side of the inner wall of the central tube assembly (2), a nozzle (15), a diffusion chamber (16) and a mixed liquid discharge flow channel (17) are formed between the pump core (3) and the inner wall of the central tube assembly (2), and the lower end of the mixed liquid discharge flow channel (17) is communicated with the mixed liquid outlet (6); The pressure-controlled self-anchoring device (20) comprises an outer tube limit platform (20.1), an expansion anchoring rubber ring (20.3), a wear-resistant anchoring tooth ring (20.4), a vulcanized elastic rib (20.5), a slip ring (20.7), and a sliding leather cup (20.8). One or more expansion anchoring rubber rings (20.3) are arranged under the outer tube limit platform (20.1). The outer end of the expansion anchoring rubber ring (20.3) is provided with a wear-resistant anchoring tooth ring (20.4) for contacting and anchoring with the casing wall; the interior of the expansion anchoring rubber ring (20.3) is provided with a vulcanized elastic rib (20.5) for supporting; the slip ring (20.7) is installed on the lower side of the expansion anchoring rubber ring (20.3), and the sliding leather cup (20.8) is fixed on the slip ring (20.7).

6. The self-anchored deep-penetration sandblasting perforating and unblocking integrated device according to claim 5 is characterized by: The inner end of the expansion anchoring rubber ring (20.3) is communicated with a pressure transmission through hole (20.6) provided on the outer tube (1) of the pump body, and a sand filter ring net (20.2) is provided on the inner wall of the outer tube (1) of the pump body.

7. The self-anchored deep-penetration sandblasting perforating and unblocking device according to claim 6 is characterized by: A spacing limiting platform (20.9) is provided on the lower side of the outer tube limiting platform (20.1), a group of expansion anchoring rubber rings (20.3) are provided on the upper side of the spacing limiting platform (20.9), and a group of expansion anchoring rubber rings (20.3) and a sliding ring (20.7) are provided on the lower side of the spacing limiting platform (20.9).

8. The method for using the self-anchored deep-penetration sandblasting perforating and unblocking device according to claim 7 is characterized by: The process includes: First, the high-pressure sand-containing power fluid on the ground is sent to the sand filter diverter (4) in the well through the oil pipe. The part of the high-pressure water filtered out by the sand-containing power fluid through the sand filter diverter (4) enters the annular gap between the pump core (3) and the central pipe assembly (2). The perforation return fluid from the lower perforation return fluid channel (9) is sucked out by the nozzle (15) with high-speed jet injection, and the sand-containing power fluid is sprayed downward along the sand-containing jet fluid flow channel (8) at the perforation nozzle (12) to realize deep-penetration hydraulic sandblasting perforation operation. At the same time of perforation, the sand-containing power fluid pushes out the expansion anchoring rubber ring (20.3) of the pressure-controlled self-anchor (20), and clamps the casing wall through the wear-resistant anchoring tooth ring (20.4) to prevent the construction pipe string from creeping, so that the perforation nozzle (12) and the casing wall are subjected to high-pressure and high-speed perforation without relative displacement, thereby ensuring the perforation quality. Secondly, the mixed liquid from the diffusion chamber (16) and the mixed liquid discharge channel (17) is sent to the annulus between the outer tube (1) of the pump body and the casing through the bridge guide (5) and the mixed liquid outlet (6), so that the sand-containing perforating liquid is discharged from the ground; when the perforating of a section is completed, the speed of the sand-containing power liquid pumped into the ground is reduced, and the pressure-controlled self-anchor (20) is retracted under the action of the internal vulcanized elastic rib (20.5), first releasing the anchoring to the casing wall, and then moving the pipe string to another perforating section, and repeating the above operation, the sandblasting perforation can be carried out in sections, and the operation is repeated section by section until the perforation of the designed section is completed; Finally, after the perforation of all the designed well sections is completed, the surface is stopped to add sand to the power fluid, the speed of injecting the power fluid is increased, and the pipe string is moved to perform jet flushing of the blasthole without adding sand and clean the near-wellbore formation. At this time, the perforating nozzle (12) exerts hydraulic impact, shearing and vibration on the perforated blasthole and the formation to remove the sand and silt accumulated in the hole, thereby avoiding the operation of starting the pipe string for the next unblocking.

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