Sand blasting perforator and coiled tubing dragging fracturing tool string with bottom seal

Abstract

The utility model provides a sand blasting perforator and coiled tubing dragging fracturing tool string with a bottom seal, and belongs to the technical field of equipment for promoting yield by forming cracks or cracks. The sand blasting perforator comprises a perforator body, a mounting hole is formed in the perforator body, a nozzle is mounted in the mounting hole, external threads are arranged on the nozzle, the mounting hole comprises a screw hole section matched with the external threads on the nozzle, and the nozzle is connected with the screw hole section in a matched mode through the external threads. The sand blasting perforator further comprises a locking structure used for locking the nozzle after the relative position of the nozzle and the mounting hole is determined, and the locking structure can be detached or damaged so that the relative position of the nozzle and the mounting hole can be readjusted after the locking structure is detached or damaged. According to the utility model, the relative position of the nozzle and the mounting hole can be adjusted by rotating the nozzle, so that the nozzle can be adjusted to a proper position according to sleeves of different pounds, the distance between the nozzle and the inner wall of the sleeve is ensured to be proper, and the perforation effect is ensured.

Description

Technical Field

[0001] The utility model relates to a sandblasting perforator and a continuous oil pipe with a bottom seal towing fracturing tool string, belonging to the technical field of equipment for promoting production by forming cracks or fissures. Background Art

[0002] At present, there are three main processes for horizontal well reservoir transformation: prefabricated pipe external isolation ball-dropping sliding sleeve staged fracturing, pumped bridge plug perforation staged fracturing and continuous tubing with bottom seal staged fracturing. Among them, continuous tubing with bottom seal staged fracturing uses continuous tubing to transport the tool to the bottom of the well, and then pulls it up to find the perforation position for sealing. The sand injected from the continuous tubing pump pierces the casing and cement ring through the high-speed jet of the sandblasting perforator, and the sand-carrying fluid is pumped from the annulus for fracturing transformation. After completion, continue to pull up and repeat the operation to complete the next stage of fracturing. The specific process can also be referred to the Chinese utility model patent with authorization announcement number CN209115092U, which discloses a continuous tubing with bottom seal dragging fracturing process string with internal blowout prevention function (i.e., continuous tubing with bottom seal dragging fracturing tool string).

[0003] From the above process, it can be seen that the sandblasting perforator is a key tool in the construction. It is responsible for ejecting high-pressure and fast fluid from the nozzle of the sand-added fracturing fluid under high pressure, and relies on this fluid to shoot open the casing, cementing cement and formation. Its specific structure is as shown in the hydraulic sandblasting perforator and its nozzle fixing sleeve disclosed in the Chinese utility model patent with authorization announcement number CN203499658U, in which the hydraulic sandblasting perforator includes an ejector body, a nozzle and a nozzle fixing sleeve. The ejector body is provided with a mounting hole. The nozzle fixing sleeve is screwed into the mounting hole through the external thread on its outer peripheral surface. The inner hole of the nozzle fixing sleeve is a step hole. The large hole section of the step hole is used to install the nozzle, and the small hole section is correspondingly connected to the nozzle of the nozzle.

[0004] The nozzle fixing sleeve is connected with the thread of the mounting hole, and the nozzle can be pressed and fixed in the mounting hole. When installing, the nozzle fixing sleeve needs to be screwed directly to the bottom, otherwise the nozzle will move. In actual applications, the inner diameters of casings of different pound grades (same outer diameter but different wall thickness) vary greatly. After the same specification of fracturing tools are strung down into the well, the distance between the nozzle and the inner wall of the casing of different pound grades will change greatly. When the distance is too large, the perforation effect is not good, resulting in failure of fracturing construction. Utility Model Content

[0005] The utility model aims to provide a sandblasting perforator to solve the problem in the prior art that the distance between the nozzle of the sandblasting perforator and the inner wall of the casing of different pound levels will vary greatly. When the distance is too large, the perforation effect is poor, resulting in failure of fracturing construction; the utility model also aims to provide a continuous oil pipe with a bottom seal to drag a fracturing tool string to solve the above problem.

[0006] In order to achieve the above-mentioned purpose, the sandblasting perforator in the utility model adopts the following technical solutions:

[0007] A sandblasting perforator comprises a perforator body, a mounting hole is arranged on the perforator body, a nozzle is installed in the mounting hole, an external thread is arranged on the nozzle, the mounting hole comprises a screw hole section adapted to the external thread on the nozzle, the nozzle is connected with the screw hole section through the external thread, and the sandblasting perforator further comprises a locking structure for locking the nozzle after the relative position of the nozzle and the mounting hole is determined, and the locking structure is detachable or destructible so as to readjust the relative position of the nozzle and the mounting hole after the locking structure is detached or destroyed.

[0008] The beneficial effect of the above technical solution is that: the utility model proposes an improved sandblasting perforator, the improvement is that an external thread is provided on the nozzle, the mounting hole includes a screw hole section adapted to the external thread on the nozzle, and the nozzle is connected with the screw hole section through the external thread, so that the relative position of the nozzle and the mounting hole can be adjusted by rotating the nozzle, so that according to the casing of different pound levels, the nozzle is adjusted to a suitable position to ensure that the distance between the nozzle and the inner wall of the casing is appropriate, and the problem of poor perforation effect and failure of fracturing construction caused by excessive distance is avoided. At the same time, since the nozzle is directly connected with the thread of the mounting hole, in order to prevent the nozzle from loosening and causing the position of the nozzle to change, the sandblasting perforator also includes a locking structure for locking the nozzle after the relative position of the nozzle and the mounting hole is determined, and the locking structure is removable or destructible, so that the relative position of the nozzle and the mounting hole can be readjusted after the locking structure is removed or destroyed, so that the position of the nozzle can be fixed and the perforation effect can be ensured, and the position of the nozzle can be adjusted again to adapt to casings of different pound levels.

[0009] Furthermore, a first groove extending along the axial direction of the nozzle is provided on the outer peripheral surface of the nozzle, and a second groove is provided on the perforator body. Both the first groove and the second groove are arc-shaped grooves and internal threads are provided on the groove walls. The locking structure includes a locking pin for threadably connecting with the two grooves after the first groove and the second groove are matched.

[0010] Furthermore, the perforator body includes a fixing ring which is separately fixed at the opening of the mounting hole, and the second groove is arranged on the inner wall of the fixing ring.

[0011] Furthermore, the mounting hole is a stepped hole, the mounting hole includes a large hole section and a small hole section, the small hole section includes the screw hole section, the hole wall of the large hole section is provided with an internal thread, the fixing ring is connected with the large hole section thread through the thread on the outer peripheral surface and a sealant is provided in the gap of the thread.

[0012] Furthermore, there are more than two first grooves and second grooves, and they are evenly distributed around the circumference.

[0013] Furthermore, an inner square hole or an inner hexagonal hole is arranged on the end surface of the locking pin.

[0014] Furthermore, the mounting hole also includes a light hole section, the nozzle includes an optical axis section matching the light hole section, and an mounting groove for mounting a sealing ring to seal and contact the optical axis section is provided on the inner wall of the light hole section.

[0015] Furthermore, a hard alloy bushing is fixed on the inner wall of the perforator body, and a connecting hole corresponding to the mounting hole is opened on the hard alloy bushing.

[0016] Furthermore, the locking pin is a hard alloy pin, and the fixing ring is a hard alloy ring.

[0017] In order to achieve the above-mentioned purpose, the coiled tubing with bottom seal dragging fracturing tool string in the utility model adopts the following technical scheme:

[0018] A continuous oil pipe with bottom seal dragging fracturing tool string, including a sandblasting perforator, the sandblasting perforator includes a perforator body, a mounting hole is provided on the perforator body, a nozzle is installed in the mounting hole, an external thread is provided on the nozzle, the mounting hole includes a screw hole section adapted to the external thread on the nozzle, the nozzle is connected to the screw hole section through the external thread, the sandblasting perforator also includes a locking structure for locking the nozzle after the relative position of the nozzle and the mounting hole is determined, and the locking structure is detachable or destructible, so as to readjust the relative position of the nozzle and the mounting hole after the locking structure is disassembled or destroyed.

[0019] The beneficial effect of the above technical scheme is that: the utility model proposes an improved continuous tubing with bottom seal dragging fracturing tool string, the improvement is that the nozzle of the sandblasting perforator is provided with an external thread, the mounting hole on the perforator body includes a screw hole section adapted to the external thread on the nozzle, and the nozzle is connected with the screw hole section through the external thread, so that the relative position of the nozzle and the mounting hole can be adjusted by rotating the nozzle, so that according to the casing of different pound levels, the nozzle is adjusted to a suitable position to ensure that the distance between the nozzle and the inner wall of the casing is appropriate, and the problem of poor perforation effect and failure of fracturing construction caused by excessive distance is avoided. At the same time, since the nozzle is directly connected with the thread of the mounting hole, in order to prevent the nozzle from loosening and causing the position of the nozzle to change, the sandblasting perforator also includes a locking structure for locking the nozzle after the relative position of the nozzle and the mounting hole is determined, and the locking structure is detachable or destructible, so that the relative position of the nozzle and the mounting hole is readjusted after the locking structure is removed or destroyed, so that the position of the nozzle can be fixed and the perforation effect can be ensured, and the position of the nozzle can be adjusted again to adapt to casings of different pound levels.

[0020] Furthermore, a first groove extending along the axial direction of the nozzle is provided on the outer peripheral surface of the nozzle, and a second groove is provided on the perforator body. Both the first groove and the second groove are arc-shaped grooves and internal threads are provided on the groove walls. The locking structure includes a locking pin for threadably connecting with the two grooves after the first groove and the second groove are matched.

[0021] Furthermore, the perforator body includes a fixing ring which is separately fixed at the opening of the mounting hole, and the second groove is arranged on the inner wall of the fixing ring.

[0022] Furthermore, the mounting hole is a stepped hole, the mounting hole includes a large hole section and a small hole section, the small hole section includes the screw hole section, the hole wall of the large hole section is provided with an internal thread, the fixing ring is connected with the large hole section thread through the thread on the outer peripheral surface and a sealant is provided in the gap of the thread.

[0023] Furthermore, there are more than two first grooves and second grooves, and they are evenly distributed around the circumference.

[0024] Furthermore, an inner square hole or an inner hexagonal hole is arranged on the end surface of the locking pin.

[0025] Furthermore, the mounting hole also includes a light hole section, the nozzle includes an optical axis section matching the light hole section, and an mounting groove for mounting a sealing ring to seal and contact the optical axis section is provided on the inner wall of the light hole section.

[0026] Furthermore, a hard alloy bushing is fixed on the inner wall of the perforator body, and a connecting hole corresponding to the mounting hole is opened on the hard alloy bushing.

[0027] Furthermore, the locking pin is a hard alloy pin, and the fixing ring is a hard alloy ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of an embodiment of the sandblasting perforator of the utility model;

[0029] Figure 2 for Figure 1 A partial enlarged view of the

[0030] Figure 3 This is a structural diagram of the perforator body in the embodiment of the sandblasting perforator of the utility model;

[0031] Figure 4 for Figure 3 AA section view in the figure;

[0032] Figure 5 This is a front view cutaway diagram of the nozzle in the embodiment of the sandblasting perforator of the utility model;

[0033] Figure 6It is a side view of the nozzle in the embodiment of the sandblasting perforator of the utility model;

[0034] Figure 7 It is a front half-section view of a fixing ring in an embodiment of a sandblasting perforator of the utility model;

[0035] Figure 8 It is a side view of a fixing ring in an embodiment of the sandblasting perforator of the utility model;

[0036] Fig. 9 It is a front view cutaway diagram of a locking pin in an embodiment of the sandblasting perforator of the utility model;

[0037] Fig.10 It is a side view of a locking pin in an embodiment of the sandblasting perforator of the present utility model.

[0038] In the figure: 1. perforator body; 11. center hole; 12. mounting hole; 121. large hole section; 122. screw hole section; 123. light hole section; 124. mounting groove; 13. flat cut surface; 14. pin hole; 2. carbide bushing; 3. fastening pin; 4. nozzle; 41. external thread section; 42. light axis section; 43. first groove; 5. locking pin; 51. internal hexagonal hole; 6. fixing ring; 61. second groove. DETAILED DESCRIPTION

[0039] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0040] In view of the technical problems existing in the prior art, the basic technical concept of the utility model is to directly connect the nozzle with the perforator body by threaded connection, so that the relative position of the nozzle and the mounting hole can be adjusted by rotating the nozzle, so that the nozzle can be adjusted to a suitable position according to casings of different pound levels, ensuring that the distance between the nozzle and the inner wall of the casing is appropriate and the perforating effect is guaranteed. At the same time, the utility model also provides a locking structure to ensure that the position of the nozzle will not change after adjustment, and the locking structure is detachable or destructible to ensure that the position of the nozzle can be adjusted again.

[0041] Embodiment of the sandblasting perforator in the utility model:

[0042] like Figure 1 and Figure 2 As shown, the sandblasting perforator includes a perforator body 1, combined with Figure 3 As shown, the perforator body 1 has a central hole 11, and a plurality of radially penetrating mounting holes 12 are arranged on the perforator body 1. In order to facilitate the processing of the mounting holes 12, a flat cut surface 13 is processed on the outer peripheral surface of the perforator body 1, and the mounting holes 12 are located at the positions of the flat cut surfaces 13. Specifically, the mounting holes 12 are stepped holes, combined with Figure 4As shown, the mounting hole 12 includes a large hole section 121 and a small hole section connected to the large hole section 121, wherein the small hole section includes a screw hole section 122 and a light hole section 123, the light hole section 123 is arranged close to the center hole 11, one end of the light hole section 123 is connected to the center hole 11, and an installation groove 124 for installing a sealing ring is arranged on the inner wall of the other end.

[0043] like Figure 1 and Figure 2 As shown, a nozzle 4 is installed in the mounting hole 12, combined with Figure 5 and Figure 6 As shown, the nozzle 4 includes an external thread section 41 and an optical axis section 42. The external thread section 41 has an external thread, which is adapted to the above-mentioned screw hole section 122. Therefore, the nozzle 4 is connected with the screw hole section 122 through the external thread section 41. In this way, the relative position of the nozzle 4 and the mounting hole 12 can be adjusted by rotating the nozzle 4, so that the nozzle 4 can be adjusted to a suitable position according to casings of different pound grades, ensuring that the distance between the nozzle 4 and the inner wall of the casing is appropriate, avoiding the problem of poor perforation effect and failure of fracturing construction due to excessive distance.

[0044] When the external thread section 41 of the nozzle 4 is matched with the threaded hole section 122, the optical axis section 42 of the nozzle 4 is matched with the optical hole section 123. By installing a sealing ring in the mounting groove 124, the sealing ring is in sealing contact with the outer peripheral surface of the optical axis section 42, thereby ensuring the sealing performance and ensuring that the fracturing fluid is ejected from the nozzle of the nozzle 4 to avoid leakage from the gap between the nozzle 4 and the mounting hole 12.

[0045] The sandblasting perforator also includes a locking structure for locking the nozzle 4 after the relative position of the nozzle 4 and the mounting hole 12 is determined, so that the position of the nozzle 4 can be fixed and the perforating effect can be ensured. At the same time, the locking structure is detachable or destructible, so that the relative position of the nozzle 4 and the mounting hole 12 can be readjusted after the locking structure is dismantled or destroyed, ensuring that the position of the nozzle 4 can be adjusted again to adapt to casings of different pound levels.

[0046] Specifically in this embodiment, Figure 5 and Figure 6 As shown, the outer circumferential surface of the nozzle 4 is provided with a first groove 43 extending along the axial direction of the nozzle 4. The first groove 43 is an arc groove provided on the external thread segment 41. There are four first grooves 43 and they are evenly distributed around the circumference. The groove wall of each first groove 43 is provided with an internal thread. Figure 1 and Figure 2 As shown, the perforator body 1 also includes a fixing ring 6 which is separately fixed at the opening of the mounting hole 12. Specifically, the fixing ring 6 is fixed in the large hole section 121 of the mounting hole 12, and the hole wall of the large hole section 121 is provided with an internal thread. Figure 7 and Figure 8As shown, the outer circumference of the fixing ring 6 is provided with threads, and the fixing ring 6 is threadedly connected with the large hole section 121 through the threads on the outer circumference, and a sealant is provided in the gap of the threaded fit, which is not only convenient for the installation of the fixing ring 6, but also ensures that the fixing ring 6 will not loosen after installation. The inner wall of the fixing ring 6 is provided with a second groove 61, which is also an arc groove and the groove wall is also provided with internal threads, and there are four second grooves 61 and they are evenly distributed around the circumference, and the internal thread diameters of the second grooves 61 and the first grooves 43 are the same, and each first groove 43 can be combined with the second groove 61 to enclose a complete threaded hole whenever the nozzle 4 rotates 90 degrees.

[0047] like Figure 1 and Figure 2 As shown, the locking structure includes a locking pin 5 for threadedly engaging with the first groove 43 and the second groove 61 after the first groove 43 and the second groove 61 are aligned. There are four locking pins 5 used for one nozzle 4. Fig. 9 and Fig.10 As shown, the outer peripheral surface of the locking pin 5 is provided with an external thread as a whole. By installing the locking pin 5 in the two grooves, the nozzle 4 can be stopped from rotating and prevented from loosening. In order to facilitate the installation and removal of the locking pin 5, an inner hexagonal hole 51 is provided on the end surface of the locking pin 5. Since the locking pin 5 has a certain length, even if the locking pin 5 is slightly loose in actual application, the nozzle 4 can still be stopped. However, in order to prevent the locking pin 5 from loosening and falling out, after the locking pin 5 is installed, hot melt adhesive can be injected into the matching gap between the locking pin 5 and the inner threads of the two grooves, or before installing the locking pin 5, hot melt adhesive can be applied on the outer threads of the locking pin 5 or the inner threads of the two grooves. After the hot melt adhesive is cured, the position of the locking pin 5 can be fixed, thereby ensuring the locking effect of the nozzle 4. The advantage of using hot melt adhesive is that when adapting to casings of different pound levels, the sandblasting perforator can be locally heated to melt the hot melt adhesive, so that the locking pin 5 can be removed, and the relative position of the nozzle 4 and the mounting hole 12 can be adjusted.

[0048] In addition, a split fixing ring 6 is fixed at the opening of the mounting hole 12, and the second groove 61 is set on the fixing ring 6. In this way, there is no need to process the second groove at the opening of the mounting hole 12, which is relatively easier to process. In addition, since the outer peripheral surface of the fixing ring 6 is an external thread as a whole, a tool with four claws or two claws can be used to cooperate with the second groove 61 during installation to achieve the rotation of the fixing ring 6. Of course, the nozzle 4 can also be used in the same way. The tool is used to cooperate with the first groove 43 to drive the nozzle 4 to rotate, so as to achieve the installation and adjustment of the nozzle 4. When adjusting the position of the nozzle 4, the second groove 61 can be used as a reference. Each rotation of a second groove 61 represents a rotation of 1 / 4 of a circle of the nozzle 4, and the distance of the axial movement of the nozzle 4 is 1 / 4 of the pitch, which is convenient for controlling the adjustment amount of the nozzle 4.

[0049] In addition, Figure 1 and Figure 2 As shown, a carbide bushing 2 is fixed on the inner wall of the perforator body 1. Specifically, the carbide bushing 2 is fixed on the perforator body 1 by a fastening pin 3. Figure 3 As shown, a pin hole 14 for installing a fastening pin 3 is provided on the perforator body 1. A connecting hole corresponding to the above-mentioned mounting hole 12 is opened on the cemented carbide bushing 2 to facilitate the installation of the nozzle 4 and allow the fracturing fluid in the center hole 11 to enter the nozzle 4. The cemented carbide bushing 2 is fixed at the position where the nozzle 4 is installed. The cemented carbide bushing 2 has high hardness and high wear resistance, which can improve the erosion resistance of the inner wall of the perforator body 1 and avoid the nozzle 4 from falling off after the inner wall is eroded and damaged. In addition, the locking pin 5 in this embodiment is a cemented carbide pin, and the fixing ring 6 is a cemented carbide ring, which ensures sufficient hardness and wear resistance to avoid splash damage during sandblasting. Of course, in order to improve the hardness of the outer surface of the perforator body 1, the outer surface of the perforator body 1 is all surface treated, and the hardness reaches HRC65-75 to avoid local damage to the outer surface.

[0050] When the sandblasting perforator of the utility model leaves the factory, the outer end of the nozzle 4 is aligned with the outer surface of the perforator body 1. During on-site construction, the optimal height of the nozzle 4 extending out of the mounting hole 12 is calculated based on calculation and software simulation analysis, and the optimal distance between the nozzle 4 and the inner wall of the casing is obtained. Then all the locking pins 5 are loosened, the nozzle 4 is rotated forward, and the nozzle moves outward by 0.5 mm for each 1 / 4 turn. According to the simulation results, the corresponding number of turns is rotated. The maximum adjustment distance of the nozzle 4 is 6 mm. This adjustment range can meet the requirements of all pound levels of the same size casing. Through precise size adjustment, the best perforation effect can be guaranteed and the success rate of fracturing construction can be guaranteed. After the relative position of the nozzle 4 and the mounting hole 12 is determined, the first groove 43 on the nozzle 4 is matched with the second groove 61 on the fixing ring 6, and then all the locking pins 5 are installed. In order to ensure the tightening effect, hot melt adhesive is injected into the matching gap between the locking pin 5 and the inner thread of the groove. After the hot melt adhesive solidifies, the sandblasting perforator and other supporting tools are assembled into a continuous tubing with bottom seal to drag the fracturing tool string. Finally, the tool string is lowered into the well. After reaching the designed formation, the ground equipment is started and the sandblasting perforation fracturing can be carried out.

[0051] In other embodiments of the sandblasting perforator: the locking pin and the fixing ring may also be made of carbon steel. In this case, it is necessary to frequently pay attention to the use of the locking pin and the fixing ring and to pay attention to their replacement.

[0052] In other embodiments of the sandblasting perforator, the carbide bushing may be fixed by welding. In other embodiments, the carbide bushing may not be fixed on the inner wall of the perforator body, and the perforator body may be directly made of carbide, or carbon steel may be used, but it needs to be replaced after a period of time.

[0053] In other embodiments of the sandblasting perforator: the mounting groove may not be provided on the inner wall of the light hole section of the mounting hole. At this time, in order to ensure the sealing effect, after the relative position of the nozzle and the mounting hole is determined, hot melt adhesive can be injected into the threaded matching gap between the nozzle and the mounting hole. The hot melt adhesive can achieve sealing after solidification and can melt after heating to ensure that the position of the nozzle can be adjusted again.

[0054] In other embodiments of the sandblasting perforator: a square hole may also be provided on the end surface of the locking pin; in other embodiments, a square head and a hexagonal head may also be provided on the end of the locking pin to prevent rotation with the tool.

[0055] In other embodiments of the sandblasting perforator: the number of the first groove and the second groove can be only two and both are evenly distributed around the circumference. In this case, when adjusting the nozzle, it is necessary to rotate an integer multiple of half a circle; of course, the number of the first groove and the second groove can also be three and both are evenly distributed around the circumference. In this case, it is necessary to rotate an integer multiple of 1 / 3 of a circle; of course, there can also be only one first groove and the second groove, in which case it is necessary to rotate a full circle.

[0056] In other embodiments of the sandblasting perforator: the fixing ring can also be directly welded and fixed in the large hole section, and in this case, there is no need to process threads on the outer circumference of the fixing ring; in other embodiments, a flat cut groove can also be processed on the outer circumference of the perforator body, and the fixing ring is directly welded and fixed in the flat cut groove. In this case, there is no need to process threads on the outer circumference of the fixing ring, and the mounting hole does not need to be set as a stepped hole, that is, the mounting hole does not include the large hole section.

[0057] In other embodiments of the sandblasting perforator, the fixing ring may not be provided, and the second groove may be directly machined on the perforator body at the opening of the mounting hole.

[0058] In other embodiments of the sandblasting perforator: the locking structure may also be a nut, which is mounted on the nozzle. When the relative position of the nozzle and the mounting hole is determined, the nut can be tightened to press the perforator body, thereby tightening the nozzle back on the perforator body. Since the nut is used as the locking structure, it can be easily disassembled, and then the relative position of the nozzle and the mounting hole can be easily readjusted.

[0059] In other embodiments of the sandblasting perforator: the locking structure can also be hot melt adhesive. When the relative position of the nozzle and the mounting hole is determined, the hot melt adhesive is injected into the threaded matching gap between the two. After the hot melt adhesive is solidified, the position of the nozzle can be fixed. When the position of the nozzle needs to be adjusted again, the position of the hot melt adhesive can be heated to melt it. The hot melt adhesive is equivalent to being destructible.

[0060] The embodiment of the fracturing tool string with bottom seal and dragged by the coiled tubing in the utility model is as follows: the fracturing tool string with bottom seal and dragged by the coiled tubing includes a sandblasting perforator, and the specific structure of the sandblasting perforator is the same as that of the sandblasting perforator in the above embodiment, which will not be repeated here.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sandblasting perforator, comprising a perforator body, a mounting hole is provided on the perforator body, a nozzle is installed in the mounting hole, and the characteristics are: The nozzle is provided with an external thread, and the mounting hole includes a screw hole section adapted to the external thread on the nozzle, and the nozzle is connected with the screw hole section through the external thread. The sandblasting perforator also includes a locking structure for locking the nozzle after the relative position of the nozzle and the mounting hole is determined. The locking structure is removable or destructible so as to readjust the relative position of the nozzle and the mounting hole after the locking structure is removed or destroyed.

2. The sandblasting perforator according to claim 1, characterized in that: A first groove extending along the axial direction of the nozzle is arranged on the outer peripheral surface of the nozzle, and a second groove is arranged on the perforator body. Both the first groove and the second groove are arc-shaped grooves and internal threads are arranged on the groove walls. The locking structure includes a locking pin for threadably connecting with the two grooves after the first groove and the second groove are matched.

3. The sandblasting perforator according to claim 2, characterized in that: The perforator body comprises a fixing ring which is separately fixed at the orifice position of the mounting hole, and the second groove is arranged on the inner wall of the fixing ring.

4. The sandblasting perforator according to claim 3, characterized in that: The mounting hole is a stepped hole, which includes a large hole section and a small hole section. The small hole section includes the screw hole section. An internal thread is arranged on the hole wall of the large hole section. The fixing ring is connected with the large hole section thread through the thread on the outer peripheral surface and a sealant is arranged in the gap of the thread.

5. The sandblasting perforator according to any one of claims 2 to 4, characterized in that: There are more than two first grooves and second grooves, and they are evenly distributed around the circumference.

6. The sandblasting perforator according to any one of claims 2 to 4, characterized in that: An inner square hole or an inner hexagonal hole is arranged on the end surface of the locking pin.

7. The sandblasting perforator according to any one of claims 1 to 4, characterized in that: The mounting hole also includes a light hole section, the nozzle includes an optical axis section matched with the light hole section, and the inner wall of the light hole section is provided with a mounting groove for mounting a sealing ring to seal and contact with the optical axis section.

8. The sandblasting perforator according to any one of claims 1 to 4, characterized in that: A hard alloy bushing is fixed on the inner wall of the perforator body, and a communicating hole corresponding to the mounting hole is opened on the hard alloy bushing.

9. The sandblasting perforator according to claim 3 or 4, characterized in that: The locking pin is a carbide pin and the fixing ring is a carbide ring.

10. A coiled tubing with bottom seal towing fracturing tool string, including a sandblasting perforator, characterized in that: The sandblasting perforator is the sandblasting perforator according to any one of claims 1 to 9.

Images