A drilling tool, a surveying tool auxiliary positioning tool and a fishing tool

Abstract

The application discloses a drilling tool, a surveying instrument auxiliary positioning tool and a fishing tool. The surveying instrument auxiliary positioning tool comprises a positioning rod used for being jointly arranged in a drilling tool with a surveying instrument; the length of the positioning rod is adjustable; one end of the positioning rod is provided with a first connecting part used for connecting the surveying instrument, and the other end of the positioning rod is provided with a second connecting part; the second connecting part comprises openable positioning claws and a positioning claw adjusting assembly used for adjusting the open and close states of the positioning claws; the positioning claws are expanded in the drilling tool to realize locking when the positioning claws are opened, and the positioning claws are released relative to the drilling tool to realize unlocking when the positioning claws are closed. The surveying instrument auxiliary positioning tool can adjust the length of the surveying instrument auxiliary positioning tool in a high-precision and large-span range, so that the surveying instrument in the drilling tool of different types can be positioned and constrained, the surveying instrument is prevented from being disengaged, the smooth operation of downhole construction is ensured, the surveying instrument can have the fishing characteristic, the surveying instrument can be recycled when a pipe sticking accident occurs, and the failure loss is reduced.

Description

Technical Field

[0001] This application relates to the field of downhole operation technology, and in particular to a directional meter auxiliary positioning tooling. It also relates to a retrieval tool applied to the aforementioned directional meter auxiliary positioning tooling, and further to a drilling tool including the aforementioned directional meter auxiliary positioning tooling. Background Technology

[0002] During drilling, a wireless measuring and directional drilling (MWD) instrument is an essential tool for directional operations. Typically, the MWD instrument rests on a key within the drill string's circulation sleeve using its own weight; this operation, known as keying, positions the MWD instrument at a specific location within the drill string.

[0003] Because the gap between the inclinometer and the non-magnetic drill collar of the drill string is small, the inclinometer is prone to debonding when there is no timely grouting inside the drill string, the drill string is lowered too quickly, or abnormal formation pressure is encountered, causing the inclinometer to fail. If inclinometer debonding failure occurs, the entire drill string must be pulled out and the inclinometer reinstalled, which wastes a lot of manpower and time. Debonding is more likely to occur when using drill string equipped with an inclinometer in horizontal wells.

[0004] Currently, the following three methods are commonly used in China to solve the debonding problem:

[0005] (i) A top rod is installed in the drill string to press and fix the inclinometer to the drill string, preventing the inclinometer from moving axially inside the drill string and thus preventing the instrument from disengaging. Since the length of the non-magnetic drill rod varies for different types of drill strings, multiple sets of drill strings are inevitably used during the construction of each well. This requires the processing of top rods of different lengths to match these drill strings, which is time-consuming and labor-intensive.

[0006] (ii) Pin holes are made on the side wall of the short non-magnetic sub of the drill string. After the inclinometer is set in the drill string, the inclinometer and the short non-magnetic sub are fixedly connected as one unit using pins inserted into the pin holes, preventing the inclinometer from moving relative to the short non-magnetic sub and thus preventing axial movement of the inclinometer within the drill string. However, because the drilling mud easily forms vortices in the pin holes of the non-magnetic sub, it wears down the non-magnetic sub and forms pits, shortening the service life of the non-magnetic sub.

[0007] (iii) A check valve is installed at the lower part of the short, non-magnetic section of the drill string to prevent bottom hole fluids such as mud from flowing back into the drill string and thus avoid impacting the inclination meter. However, impurities in the mud can easily accumulate at the check valve, resulting in poor reliability of the check valve's operation.

[0008] Furthermore, if a stuck drill accident occurs, the equipment assembled using the above-mentioned first (i) and (ii) operation methods will not be able to retrieve the inclinometer inside the drill string. Since the inclinometer is an expensive instrument, this will cause significant economic losses to downhole operations. Summary of the Invention

[0009] The purpose of this application is to provide an auxiliary positioning fixture for a directional drilling instrument (DDI), which can position and constrain the DDI within the drill string to prevent it from becoming dislodged. Simultaneously, it considers the retrieval capability of the DDI, enabling retrieval and reuse of the DDI in the event of a stuck drill string, thereby reducing economic losses during drilling operations. Another purpose of this application is to provide a retrieval tool applied to the aforementioned auxiliary positioning fixture for the DDI. A further purpose of this application is to provide a drilling tool including the aforementioned auxiliary positioning fixture for the DDI.

[0010] To achieve the above objectives, this application provides an auxiliary positioning fixture for an inclinometer, including a positioning rod for installation together with the inclinometer inside the drill bit;

[0011] The length of the positioning rod is adjustable; one end of the positioning rod is provided with a first connecting part for connecting to the inclinometer, and the other end of the positioning rod is provided with a second connecting part; the second connecting part includes an openable positioning claw and a positioning claw adjustment assembly for adjusting the opening and closing state of the positioning claw; when the positioning claw is open, it expands inside the drill bit to achieve locking, and when the positioning claw is closed, it loosens relative to the drill bit to achieve unlocking.

[0012] In some embodiments, the positioning claw adjustment assembly includes:

[0013] Expanding component; The expanding component is located inside the positioning claw and is movably installed along the axial direction of the positioning claw to expand the positioning claw;

[0014] Expanding positioning component; the expanding positioning component is used to position the expanding component within the inner circumference of the positioning claw; the expanding positioning component is movable or deformable.

[0015] In some embodiments, the positioning claw adjustment assembly further includes an outer cylinder; the expansion positioning member includes an elastic member; the positioning claw includes a plurality of pawls, all of which are disposed on the periphery of the outer cylinder; the expansion member and the elastic member are both disposed inside the outer cylinder and are distributed sequentially from the outside to the inside along the axial direction of the outer cylinder; the elastic member extends and retracts along the axial direction of the outer cylinder, and one end of the elastic member abuts against the shaft end of the expansion member.

[0016] In some embodiments, the expansion member includes an inner cylinder; the outer cylinder has a third connecting portion for connecting the retrieval tool; the inner cylinder, the elastic member, and the third connecting portion are distributed sequentially from the outside to the inside along the axial direction of the outer cylinder; the elastic member is hollow, and the retrieval tool can be inserted sequentially into the positioning claw, the inner cylinder, and the elastic member to compress the elastic member and connect to the third connecting portion.

[0017] In some embodiments, the outer cylinder is provided with a first step, a second step, and a third step; the first step, the second step, and the third step gradually decrease in size from the outside to the inside along the axial direction of the outer cylinder; the outer diameter of the inner cylinder is smaller than the inner diameter of the second step and larger than the inner diameter of the third step; the other end of the elastic body is fixed to the third step.

[0018] In some embodiments, the third connection portion is specifically a first reverse thread provided on the inner wall of the third step.

[0019] In some embodiments, the positioning rod includes a top rod, a length adjuster, and an extension rod; the top rod, the length adjuster, and the extension rod are distributed sequentially along the axial direction of the positioning rod and are detachably connected in pairs; a second connecting part is provided on the top rod, and a first connecting part is provided on the extension rod; both the top rod and the extension rod are fixed rods, and the length adjuster is a telescopic rod.

[0020] In some embodiments, the length adjuster includes an adjusting outer cylinder, an adjusting rod, and a connecting pin; the adjusting outer cylinder and the adjusting rod are sleeved on each other and movably connected along the axial direction; the adjusting outer cylinder is provided with a pin hole on its periphery, and the adjusting rod is provided with an axially extending positioning groove on its periphery; the connecting pin passes through the pin hole and is embedded in the clamping positioning groove to achieve relative fixation of the adjusting outer cylinder and the adjusting rod.

[0021] In some embodiments, the adjusting outer cylinder is provided with a first connecting thread; the adjusting rod includes a connecting rod and a connecting sleeve, the connecting rod is provided with a second connecting thread for connecting the first connecting thread, and the connecting sleeve is provided with a through hole that extends radially.

[0022] This application also provides a salvage tool for salvaging the aforementioned inclinometer auxiliary positioning fixture, including a salvage rod; one end of the salvage rod is provided with a salvage head and an open locking ring, and the other end of the salvage rod is provided with a cable connector; the circumferential side of the open locking ring is provided with an axially penetrating opening, and the circumferential surface of the open locking ring is provided with a second reverse thread; the radial dimension of the uncompressed open locking ring, the inner diameter of the third step, and the radial dimension of the salvage head decrease sequentially.

[0023] When the retrieval head and the open locking ring are inserted into the positioning rod in sequence, the open locking ring is compressed and squeezed into the third step so that the second reverse thread is threadedly connected to the first reverse thread.

[0024] In some embodiments, the retrieval rod includes rod I and rod II; the adjacent shaft ends of rod I and rod II are sleeved together and fixedly connected by shear pins; one end of rod I is provided with a retrieval head and an open locking ring, and the other end of rod I is provided with a plug-in portion that can be inserted and fixed by a universal retrieval tube.

[0025] This application also provides a drilling tool, including a drill string, a directional meter, and the aforementioned directional meter auxiliary positioning fixture; the drill string includes a first connecting section, a second connecting section, and a tail drill pipe; the first connecting section, the second connecting section, and the tail drill pipe are all sleeve-shaped, with the first connecting section and the tail drill pipe respectively installed at both ends of the second connecting section; the first connecting section is provided with a drill bit; the second connecting section is provided with a limiting platform for positioning claws to expand and position; the directional meter and the directional meter auxiliary positioning fixture are jointly inserted into the second connecting section.

[0026] Compared to the aforementioned background technology, the inclinometer auxiliary positioning fixture provided in this application includes a positioning rod for being installed together with the inclinometer inside the drill string; the length of the positioning rod is adjustable; one end of the positioning rod is provided with a first connecting part for connecting the inclinometer, and the other end of the positioning rod is provided with a second connecting part; the second connecting part includes an openable and closable positioning claw and a positioning claw adjusting assembly for adjusting the opening and closing state of the positioning claw; wherein, when the positioning claw is open, it expands inside the drill string to achieve locking, and when the positioning claw is closed, it loosens relative to the drill string to achieve unlocking.

[0027] The directional drilling instrument auxiliary positioning fixture provided in this application can adjust its length with high precision and a large span range. Therefore, it can position and constrain directional drilling instruments in different types of drill strings, preventing the instrument from becoming dislodged within the drill string. In other words, it can stably and reliably position the directional drilling instrument at a specific location within the drill string, ensuring its operational effectiveness. The directional drilling instrument auxiliary positioning fixture also has retrieval capabilities, thus enabling the connected directional drilling instrument to be retrieved. In the event of a stuck drill bit accident, operators can easily and quickly remove and retrieve the directional drilling instrument from the downhole drill string using the directional drilling instrument auxiliary positioning fixture, achieving the recovery and reuse of the instrument and effectively reducing accident losses. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 This is an assembly diagram of the inclinometer auxiliary positioning fixture and universal retrieval cylinder provided in the embodiments of this application;

[0030] Figure 2 This is a schematic diagram of the top rod provided in the embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the structure of the adjusting rod provided in the embodiment of this application;

[0032] Figure 4 for Figure 3 A sectional view along direction AA;

[0033] Figure 5 This is a schematic diagram of the structure of the adjusting outer cylinder provided in an embodiment of this application;

[0034] Figure 6 This is a schematic diagram of the salvage tool provided in the embodiments of this application;

[0035] Figure 7 A schematic diagram of the drilling tool provided in this application;

[0036] Figure 8 This is an assembly diagram of the salvage tool and inclinometer auxiliary positioning fixture provided in the embodiments of this application;

[0037] Figure 9 This is an assembly diagram of the general-purpose retrieval cylinder, some retrieval tools, and inclinometer auxiliary positioning fixture provided in the embodiments of this application.

[0038] in,

[0039] 1-Inclinometer auxiliary positioning fixture, 100-Top rod, 110-Length adjuster, 120-Extending rod, 11-Positioning claw, 12-Outer cylinder, 121-First step, 122-Second step, 123-Third step, 13-Inner cylinder, 14-Elastic element, 15-First reverse thread, 16-Adjusting outer cylinder, 161-Pin hole, 162-First connecting thread, 17-Adjusting rod, 171-Positioning groove, 172-Connecting rod, 173-Connecting sleeve, 174-Second connecting thread, 175-Through hole, 18-Connecting pin, 19-Circulation hole;

[0040] 2-Drill string, 21-First connecting section, 22-Second connecting section, 23-Tail drill pipe, 24-Drill bit, 25-Limiting platform;

[0041] 3-Salvage tool, 31-Salvage rod, 311-Rod I, 312-Rod II, 32-Salvage head, 33-Open locking ring, 34-Second reverse thread, 35-Shear pin hole, 36-Plug-in part, 37-Protrusion, 38-Locking ring groove;

[0042] 4-Universal scooping tube;

[0043] 5- Inclinometer;

[0044] 6-Cable;

[0045] 7-Sucker rod. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Please refer to Figures 1 to 9 , Figure 1 This is an assembly diagram of the inclinometer auxiliary positioning fixture and universal retrieval cylinder provided in the embodiments of this application; Figure 2 This is a schematic diagram of the top rod provided in the embodiment of this application; Figure 3 This is a schematic diagram of the structure of the adjusting rod provided in the embodiment of this application;

[0049] Figure 4 for Figure 3 A sectional view along direction AA; Figure 5 This is a schematic diagram of the structure of the adjusting outer cylinder provided in an embodiment of this application; Figure 6 This is a schematic diagram of the salvage tool provided in the embodiments of this application; Figure 7 A schematic diagram of the drilling tool provided in this application; Figure 8 This is an assembly diagram of the salvage tool and inclinometer auxiliary positioning fixture provided in the embodiments of this application; Figure 9 This is an assembly diagram of the general-purpose retrieval cylinder, some retrieval tools, and inclinometer auxiliary positioning fixture provided in the embodiments of this application.

[0050] Please refer to Figure 1 , Figure 2 and Figure 7 This application provides an inclinometer auxiliary positioning fixture 1, which includes a positioning rod and a first connecting part and a second connecting part respectively disposed at both ends of the positioning rod.

[0051] The positioning rod is used to be installed together with the inclinometer 5 inside the drill string 2. Its length is adjustable, so its length can be adjusted according to the dimensional relationship between the drill string 2 and the inclinometer 5, thereby positioning the inclinometer 5 in a designated position inside the drill string 2. In addition, depending on the actual working conditions, an auxiliary connecting component, such as a universal retrieval cylinder 4, can be added between the positioning rod and the inclinometer 5 to fix the positioning rod and the inclinometer 5 together.

[0052] The first connecting part and the second connecting part are respectively located at both ends of the positioning rod. The first connecting part is used to connect the inclinometer 5, that is, the positioning rod can be connected to the inclinometer 5 through the first connecting part, connecting the positioning rod and the inclinometer 5 into one unit. The second connecting part includes a positioning claw 11 and a positioning claw adjustment assembly. The positioning claw 11 can perform opening and closing movements, that is, the positioning claw 11 has at least two states: open and closed. The positioning claw adjustment assembly is connected to the positioning claw 11 and is used to adjust the opening and closing state of the positioning claw 11.

[0053] In this inclinometer auxiliary positioning fixture 1, when the positioning claw 11 opens, it can expand within the drill string 2, locking both the inclinometer auxiliary positioning fixture 1 and the drill string 2. At this time, the positioning rod is fixed inside the drill string 2, which also fixes the inclinometer 5 connected to the positioning rod inside the drill string 2. Conversely, when the positioning claw 11 closes, it releases the drill string 2, causing the inclinometer auxiliary positioning fixture 1 and its positioning claw 11 to detach from the drill string 2, unlocking both the inclinometer auxiliary positioning fixture 1 and the drill string 2. At this time, the positioning rod can move within the drill string 2 and no longer provides a positioning effect for the inclinometer 5 and the drill string 2.

[0054] In summary, the inclinometer auxiliary positioning fixture 1 provided in this application can provide auxiliary positioning for the inclinometer 5 and the drill string 2 during normal construction, ensuring that the inclinometer 5 is stably and reliably positioned and installed in a specific location within the drill string 2, thus guaranteeing the operational effectiveness of the inclinometer 5. Furthermore, the inclinometer auxiliary positioning fixture 1 provided in this application can also easily and quickly remove the inclinometer 5 from the drill string 2 during abnormal construction activities such as when the drill string 2 is stuck downhole, enabling the recycling of the inclinometer 5 and leaving only the drill string 2 downhole, thereby improving product recovery rate and reducing failure costs.

[0055] Typically, when using the inclinometer auxiliary positioning tool 1 provided in this application to remove the inclinometer 5 from the drill string 2, the inclinometer auxiliary positioning tool 1 and the drill string 2 can be unlocked first. At this time, the inclinometer auxiliary positioning tool 1 and the inclinometer 5 are still connected. Then, a suitable tool is selected and inserted downhole into the drill string 2. The tool is used to connect the inclinometer auxiliary positioning tool 1. Then, the tool is pulled outward to remove the tool, the inclinometer auxiliary positioning tool 1, and the drill string 2 from the drill string 2 located downhole.

[0056] The inclinometer auxiliary positioning fixture 1 provided in this application will be further described below with reference to the accompanying drawings and embodiments.

[0057] Still worth referencing Figure 1 , Figure 2 and Figure 7 In some embodiments, the positioning claw adjustment assembly of the inclinometer auxiliary positioning fixture 1 may include an expansion member and an expansion positioning member; the aforementioned expansion member is disposed on the positioning claw 11 and is movably installed along the axial direction of the positioning claw 11 for expanding the positioning claw 11; the aforementioned expansion positioning member is movable or deformable for positioning the expansion member on the inner circumference of the positioning claw 11.

[0058] In the above embodiments, the expansion positioning component is movable or deformable. Taking the movable expansion positioning component as an example, assuming that the expansion positioning component can be positioned within the inner circumference of the positioning claw 11 before it moves, then the expansion component is inserted into the positioning claw 11 and expands outwards, causing the positioning claw 11 to open, thereby locking the inclinometer auxiliary positioning fixture 1 and the drill bit 2 through the positioning claw 11; after the expansion positioning component moves, the positioning effect of the expansion positioning component is removed, and the expansion component moves along the axial direction of the positioning claw 11. Once the expansion component disengages from the positioning claw 11, the expansion component no longer expands outwards, causing the positioning claw 11 to close naturally, thereby unlocking the inclinometer auxiliary positioning fixture 1 and the drill bit 2 through the positioning claw 11.

[0059] Similarly, if the expansion positioning component is a deformable expansion positioning component, the relative positional relationship between the expansion component and the positioning claw 11 can be changed before and after the expansion positioning component is deformed, thereby using the positioning claw 11 to lock and unlock the inclinometer auxiliary positioning fixture 1 and the drill 2.

[0060] As can be seen from the above, when the operator uses the inclinometer-assisted positioning fixture 1, the expanded positioning component can be adjusted according to its movable or deformable properties, thereby adjusting the locking and unlocking states of the positioning claw 11.

[0061] Based on the above embodiments, the positioning claw adjustment assembly also includes an outer cylinder 12. Meanwhile, the expansion positioning member includes an elastic member 14, and the positioning claw 11 includes multiple pawls. All pawls are located on the periphery of the outer cylinder 12. The expansion member and the elastic member 14 are located inside the outer cylinder 12, and the expansion member and the elastic member 14 are distributed sequentially from the outside to the inside along the axial direction of the outer cylinder 12. The elastic member 14 extends and retracts along the axial direction of the outer cylinder 12, and one end of the elastic member 14 abuts against the shaft end of the expansion member.

[0062] In the above embodiment, since the expansion member and the elastic member 14 are distributed sequentially from the outside to the inside along the axial direction of the outer cylinder 12, when the adjacent axial ends of the elastic member 14 and the expansion member abut against each other, if no external force is applied to the elastic member 14, the elastic member 14 can push the expansion member outward along the axial direction of the outer cylinder 12. If an external force is applied to the elastic member 14 inward into the outer cylinder 12, the elastic member 14 will be compressed and deformed, causing the expansion member to lose the support of the elastic member 14 and move inward into the outer cylinder 12. It can be seen that the expansion positioning member includes a deformable elastic member 14. Applying pressure to the elastic member 14 from outside the outer cylinder 12 into the outer cylinder 12 can deform the elastic member 14. The deformation of the elastic member 14 will cause the expansion member to move along the axial direction of the outer cylinder 12, thereby changing the relative positional relationship between the expansion member and the positioning claw 11, and realizing the locking and unlocking of the inclinometer auxiliary positioning fixture 1 and the drill bit 2 using the positioning claw 11.

[0063] Typically, in the above embodiments, when the elastic member 14 is not compressed and deformed, the elastic member 14 pushes outward toward the outer cylinder 12 and supports the expansion member, so that the expansion member is inserted into the inner circumference of the positioning claw 11, thereby expanding the positioning claw 11 outward with the expansion member. Conversely, when the elastic member 14 is compressed and deformed, the expansion member moves inward toward the outer cylinder 12 with the elastic member 14, causing the expansion member to detach from the inner circumference of the positioning claw 11. After losing the support of the expansion member, the positioning claw 11 naturally closes.

[0064] Furthermore, the expansion member used in the above embodiments may include an inner cylinder 13, while the outer cylinder 12 is provided with a third connecting part for connecting the retrieval tool 3. The inner cylinder 13, the elastic member 14, and the third connecting part can be distributed sequentially from the outside to the inside along the axial direction of the outer cylinder 12. The elastic member 14 is hollow, or in other words, the elastic member 14 is cylindrical, so the retrieval tool 3 can be inserted sequentially through the positioning claw 11, the inner cylinder 13, and the elastic member 14 to compress the elastic member 14 and connect to the third connecting part. Typically, the elastic member 14 is specifically set as a spring, the upper end of which can be welded and fixed to the inner cylinder 13, and the lower end of which can be fixed to the outer cylinder 12 by a pin.

[0065] As described above, when drill string 2 becomes stuck downhole, operators can use tools and the inclinometer-assisted positioning fixture 1 to easily and quickly remove the inclinometer 5 from the drill string 2, thus enabling the recovery and reuse of the inclinometer 5. (See reference...) Figure 6 and Figure 8 Salvage tool 3 is a specific implementation of the aforementioned tool.

[0066] Please refer to Figure 1 , Figure 2 , Figure 6 and Figure 8 When the operator uses the retrieval tool 3 and the inclinometer-assisted positioning fixture 1 to retrieve the inclinometer 5 from the downhole drill string 2, the operator can insert the retrieval tool 3 downhole and into the drill string 2. As the retrieval tool 3 extends from one end of the axial direction of the drill string 2 to the other end, part of the structure of the retrieval tool 3 can squeeze the elastic element 14, and part of the structure of the retrieval tool 3 can pass through the elastic element 14 and connect to the third connecting part.

[0067] For example, the retrieval tool 3 includes a retrieval head and a retrieval rod 31. The radial dimension of the retrieval rod 31 is larger than that of the retrieval head, while the radial dimension of the retrieval head is smaller than the inner diameter of the elastic element 14. When the retrieval head and the retrieval rod 31 are sequentially inserted into the positioning claw 11, the inner cylinder 13, and the elastic element 14, the retrieval head can pass through the positioning claw 11, the inner cylinder 13, and the elastic element 14 in sequence, and finally connect to the third connecting part. However, the retrieval rod 31 cannot be inserted into the elastic element 14, causing the retrieval rod 31 to gradually squeeze the elastic element 14 as the retrieval head continues to penetrate deeper into the drill bit 2, causing the elastic element 14 to be compressed and deformed.

[0068] As can be seen, based on the shape, structure and connection relationship of the retrieval tool 3 and the inclinometer auxiliary positioning fixture 1, the inclinometer 5 can be retrieved from the drilling tool 2 downhole by using the retrieval tool 3 and the inclinometer auxiliary positioning fixture 1. The operator only needs to insert the retrieval tool 3 into the drilling tool 2 to achieve the two purposes of unlocking the inclinometer auxiliary positioning fixture 1 and the drilling tool 2 by the positioning claw 11 and connecting the retrieval tool 3 to the inclinometer auxiliary positioning fixture 1 and the inclinometer 5, thus achieving easy and quick retrieval of the inclinometer 5 from the drilling tool 2 downhole.

[0069] For reference Figure 1 and Figure 2 In some embodiments, the outer cylinder 12 is provided with a first step 121, a second step 122, and a third step 123. The first step 121, the second step 122, and the third step 123 gradually decrease in diameter from the outside to the inside along the axial direction of the outer cylinder 12. That is, the inner diameters of the first step 121, the second step 122, and the third step 123 decrease in sequence. The outer diameter of the inner cylinder 13 is smaller than the inner diameter of the second step 122, and the outer diameter of the inner cylinder 13 is larger than the inner diameter of the third step 123. This makes the inner cylinder 13 only able to move between the axial end of the outer cylinder 12, the first step 121, and the second step 122, and cannot enter the third step 123 of the outer cylinder 12, nor can it reach the other axial end of the outer cylinder 12. Typically, when the inner cylinder 13 is positioned between the shaft end of the outer cylinder 12 and the first step 121, the inner cylinder 13 is inserted into the inner circumference of the positioning claw 11, allowing it to expand outwards. When the inner cylinder 13 is positioned between the first step 121 and the second step 122, the inner cylinder 13 disengages from the positioning claw 11, and the positioning claw 11 naturally closes. The outer edge of the shaft end of the inner cylinder 13 may be rounded; the outer cylinder 12 may have a circulation hole 19 that extends radially and axially.

[0070] For reference Figure 2 , Figure 6 and Figure 8 In some embodiments, the outer cylinder 12 is provided with a third connecting part, which may specifically be a first reverse thread 15 provided on the inner wall of the third step 123. This first reverse thread 15 is used to connect the retrieval tool 3. Of course, the retrieval tool 3 is often provided with a threaded structure that mates with the aforementioned first reverse thread 15, as detailed below.

[0071] For reference Figure 1 and Figure 7In the inclinometer auxiliary positioning fixture 1 provided in this application, the positioning rod may include a top rod 100, a length adjuster 110, and an extension rod 120 connected in sequence. The top rod 100, length adjuster 110, and extension rod 120 are distributed sequentially along the axial direction of the positioning rod, and any two adjacent parts of the top rod 100, length adjuster 110, and extension rod 120 can be detachably connected via a male-female thread or similar structure. For the aforementioned positioning rod, a second connecting part may be provided on the top rod 100, and a first connecting part may be provided on the extension rod 120. The extension rod 120 is connected to the inclinometer 5 through the first connecting part, and the top rod 100 is used to lock and unlock the inclinometer auxiliary positioning fixture 1 and the drill bit 2 through the second connecting part.

[0072] For the aforementioned positioning rod, both the top rod 100 and the extension rod 120 can be set as fixed rods, and the length adjuster 110 can be set as a telescopic rod. It can be seen that the positioning rod achieves length adjustment based on the telescopic characteristics of the length adjuster 110.

[0073] In the above embodiments, the length adjustment of the positioning rod is based on the telescopic characteristics of the length adjuster 110. Specifically, when it is necessary to increase the length of the positioning rod, the operator can adjust the length adjuster 110 to extend it, thereby increasing the total length of the top rod 100, the length adjuster 110 and the extension rod 120. Conversely, when it is necessary to shorten the length of the positioning rod, the operator can adjust the length adjuster 110 to shorten it, thereby reducing the total length of the top rod 100, the length adjuster 110 and the extension rod 120.

[0074] The top rod 100, length adjuster 110, and extension rod 120 are assembled to form a positioning rod. Therefore, for any one of the top rod 100, length adjuster 110, and extension rod 120 individually, the processing difficulty, usage difficulty, and storage and transportation difficulty are reduced. For the entire positioning rod, any one of the top rod 100, length adjuster 110, and extension rod 120 can be repaired and replaced individually, thereby improving the utilization rate of the remaining structures.

[0075] In addition, you can refer to Figure 1 , Figures 3 to 5In the inclinometer auxiliary positioning fixture 1 provided in this application, the length adjuster 110 may include an adjusting outer cylinder 16, an adjusting rod 17, and a connecting pin 18. In this embodiment, the adjusting outer cylinder 16 and the adjusting rod 17 are nested together, and the adjusting outer cylinder 16 and the adjusting rod 17 are axially connected. Here, the axial direction can refer to the axial direction of the outer cylinder 12 or the adjusting rod 17, or the axial direction of the entire positioning rod. In this embodiment, the adjusting outer cylinder 16 is provided with a pin hole 161 on its circumference, and the adjusting rod 17 is provided with a positioning groove 171 on its circumference, which extends along the axial direction of the adjusting rod 17. Typically, the adjusting rod 17 is provided with two symmetrically distributed positioning grooves 171 on its circumference. The upper end of the adjusting outer cylinder 16 may be provided with a female buckle for engaging with the male buckle at the lower end of the top rod 100.

[0076] When installing the adjusting outer cylinder 16 and the adjusting rod 17, a connecting pin 18 can be inserted through the pin hole 161 and embedded into the clamping positioning groove 171 to fix the adjusting outer cylinder 16 and the adjusting rod 17 relative to each other. Since the positioning groove 171 is located on the periphery of the adjusting rod 17 and extends along the axial direction of the adjusting rod 17, when it is necessary to increase or decrease the length of the length adjuster 110, the operator can adjust the position of the pin in the positioning groove 171, allowing the pin to move between the two ends of the positioning groove 171.

[0077] Still worth referencing Figure 1 , Figures 3 to 5 Based on the above embodiment, the adjusting outer cylinder 16 is provided with a first connecting thread 162; the adjusting rod 17 includes a connecting rod 172 and a connecting sleeve 173, the connecting rod 172 is provided with a second connecting thread 174, the tooth profile of which can be set to sawtooth or trapezoidal, and the connecting sleeve 173 is provided with a through hole 175 extending radially. The first connecting thread 162 of the adjusting outer cylinder 16 can be threadedly connected to the second connecting thread 174 of the connecting rod 172; the connecting sleeve 173 is provided with a through hole 175, which can be used to insert tools such as screwdrivers, so as to facilitate the rotation of the adjusting rod 17 with the help of tools, and can also be used to insert a pin to connect the length adjuster 110 and the outer cylinder 12 after the length adjustment of the length adjuster 110 is completed.

[0078] Please refer to Figure 1 , Figure 2 , Figures 6 to 8This application also provides a retrieval tool 3, applied to the aforementioned inclinometer auxiliary positioning fixture 1, including a retrieval rod 31. In this retrieval tool 3, one end of the retrieval rod 31 is provided with a retrieval head and an open locking ring, and the other end of the retrieval rod 31 is provided with a cable connector. The aforementioned open locking ring has an axially penetrating opening on its circumference, which makes the open locking ring elastic. Simultaneously, the circumferential surface of the aforementioned open locking ring is provided with a second reverse thread 34, which is used to threadly engage with a first reverse thread 15, thereby achieving a fixed connection between the retrieval tool 3 and the inclinometer auxiliary positioning fixture 1. The first reverse thread 15 has a downward tooth profile angle, and the second reverse thread 34 has an upward tooth profile angle, allowing the first reverse thread 15 and the second reverse thread 34 to engage firmly.

[0079] Of course, the aforementioned retrieval tool 3 and the inclinometer auxiliary positioning fixture 1 also need to meet certain dimensional relationships to achieve a fixed connection between the retrieval tool 3 and the inclinometer auxiliary positioning fixture 1 using the first reverse thread 15 and the second reverse thread 34 when the retrieval tool 3 is inserted into the drill string 2. The aforementioned dimensional relationship refers to the fact that the radial dimension of the uncompressed open locking ring 33, the inner diameter of the third step 123, and the radial dimension of the retrieval head decrease sequentially. Typically, the lower part of the aforementioned retrieval head is spherical or conical.

[0080] When the retrieval head and the open locking ring 33 are inserted into the positioning rod in sequence, the retrieval head can easily insert into the third step 123 to guide the uncompressed open locking ring 33 into the third step 123. Since the radial dimension of the uncompressed open locking ring 33 is larger than the required value, it is compressed and deformed as it is continuously inserted into the third step 123. In other words, after being compressed and deformed, the open locking ring 33 is squeezed into the third step 123, allowing the first reverse thread 15 within the third step 123 and the second reverse thread 34 on the periphery of the open locking ring 33 to mesh with each other. When the first reverse thread 15 and the second reverse thread 34 mesh with each other, the open locking ring 33 has a tendency to open outwards towards its periphery, ensuring a secure and reliable connection between the first reverse thread 15 and the second reverse thread 34.

[0081] Furthermore, in some embodiments, the retrieval rod 31 also includes rods I311 and II312 that are assembled and connected. The adjacent shaft ends of rods I311 and II312 are sleeved together, and the adjacent shaft ends of rods I311 and II312 are fixedly connected by shear pins; wherein, one end of rod I311 is provided with a retrieval head and an open locking ring 33, and the other end of rod I311 is provided with a plug-in part 36 for a universal retrieval cylinder 4 to be inserted and fixed.

[0082] Typically, four or more shear pin holes 35 can be provided at the adjacent shaft ends of rod I311 and rod II312. Operators can insert multiple shear pins into all the shear pin holes 35 according to the actual working conditions, thereby achieving tonnage control.

[0083] During the retrieval of the inclinometer auxiliary positioning tool 1 and the inclinometer 5, the use of shear pins to control the release tonnage can be understood as follows: when the retrieval tool 3 and its retrieval rod 31 are used to remove the inclinometer auxiliary positioning tool 1 and the inclinometer 5 from downhole, if the load on the retrieval tool 3 is too large, the shear pins can break in time, causing the rods I311 and II312 of the retrieval rod 31 to separate from each other, thus avoiding damage to the inclinometer auxiliary positioning tool 1 and the inclinometer 5 due to forced retrieval. Of course, if the load on the retrieval tool 3 does not exceed the limit of the shear pins, the rods I311 and II312 of the retrieval rod 31 will connect to each other under the action of the shear pins. The retrieval tool 3 can then connect to the inclinometer auxiliary positioning tool 1 and pull it out of the well, thus retrieving the inclinometer auxiliary positioning tool 1 and the inclinometer 5 from downhole and the drill string 2.

[0084] If the shear pin breaks due to excessive load on the fishing tool 3, the fishing rod I311 and rod II312 of the fishing rod 31 will separate from each other. Rod I311, along with the inclinometer auxiliary positioning tool 1 and the inclinometer 5, will remain inside the drill string 2. Rod II312 and other parts of the fishing tool 3 can be removed from the well. Then, the tool can be replaced, and the new tool can be used to connect rod 172I, thereby removing rod I311, the inclinometer auxiliary positioning tool 1, and the inclinometer 5 together.

[0085] Typically, the retrieval tool 3 is used in conjunction with the cable 6. The load limit of the retrieval tool 3 depends on the load capacity of the cable 6. Therefore, to prevent the cable 6 from breaking due to excessive load from the retrieval tool 3, the shear pin is designed to break before the cable 6. When the cable 6 and the retrieval tool 3 cannot retrieve the inclinometer auxiliary positioning tool 1 and the inclinometer 5 from downhole, a rigid rod can be used to remove the inclinometer auxiliary positioning tool 1 and the inclinometer 5. That is, a rigid rod can be inserted into the drill string 2 downhole, and the rigid rod can be connected to rod I311. Then, the aforementioned rigid rod, rod I311, inclinometer auxiliary positioning tool 1, and inclinometer 5 can be pulled out of the well. The aforementioned rigid rod can be... Figure 9 The universal scooping tube 4 and sucker rod 7 are shown.

[0086] In addition, the aforementioned rod I311 may specifically include a sucker rod retrieval head and a retrieval head 32. The sucker rod retrieval head and the retrieval head 32 are connected to each other through a connector. For example, the sucker rod retrieval head is provided with a female buckle, and the retrieval head 32 is provided with a male buckle. The female buckle of the sucker rod retrieval head is provided with an outwardly protruding protrusion 37, and the retrieval head 32 is provided with a locking ring groove 38. When installing the sucker rod retrieval head and the retrieval head 32, the female buckle of the sucker rod retrieval head and the male buckle of the retrieval head 32 are engaged with each other, and the protrusion 37 is embedded in the locking ring groove 38.

[0087] Based on the various embodiments provided above, this application also provides a drilling tool, including a drill string 2, and of course, a directional measuring instrument auxiliary positioning fixture 1.

[0088] In the drilling tools provided in this application, the drill string 2 may include a first connecting section 21, a second connecting section 22 and a tail drill pipe 23 connected in sequence; the first connecting section 21, the second connecting section 22 and the tail drill pipe 23 are all sleeve-shaped, and the first connecting section 21 and the tail drill pipe 23 are respectively installed at both ends of the second connecting section 22; the aforementioned first connecting section 21 is provided with a drill bit 24, and the aforementioned second connecting section 22 is provided with a limiting platform 25 that can be expanded and positioned by the positioning claw 11.

[0089] For the aforementioned drilling tools, the inclinometer 5 and the inclinometer auxiliary positioning fixture 1 are jointly inserted into the second connecting section 22, and the inclinometer auxiliary positioning fixture 1 and the tail drill pipe 23 jointly constrain the axial position of the inclinometer 5 within the drill string 2.

[0090] In summary, the inclinometer auxiliary positioning fixture 1 provided in this application can position and constrain the inclinometer 5 within the drill string 2, preventing the inclinometer 5 from becoming dislodged within the drill string 2. Furthermore, the drilling tool provided in this application has an anti-dislodging function for the inclinometer 5, which can improve the positioning accuracy and installation strength of the inclinometer 5 within the drill string 2.

[0091] When using the inclinometer auxiliary positioning fixture 1 to position the inclinometer 5 inside the drill string 2, firstly, the inclinometer 5 is placed inside the drill string 2 and a keying operation is performed on the inclinometer 5. After this operation, the required compensation length of the inclinometer 5 inside the drill string 2 needs to be obtained by measuring the length of the setting tool. This compensation length will be provided by the inclinometer auxiliary positioning fixture 1. Subsequently, the inclinometer auxiliary positioning fixture 1 is adjusted according to the compensation length, specifically by adjusting the length of the length adjuster 110 of the inclinometer auxiliary positioning fixture 1, so that the total length of the inclinometer auxiliary positioning fixture 1 meets the compensation length. Next, the adjusted inclinometer auxiliary positioning fixture 1 and the inclinometer 5 are installed together inside the drill string 2. The inclinometer auxiliary positioning fixture 1 is used to hold the inclinometer 5 in place to prevent the inclinometer 5 from leaving its target installation position and to avoid the inclinometer 5 from moving freely inside the drill string 2.

[0092] When a stuck drill bit occurs, the operator needs to retrieve the inclinometer 5. At this time, the inclinometer auxiliary positioning tool 1 makes the inclinometer 5 have good retrieval characteristics. In other words, the operator can retrieve the inclinometer 5 through the inclinometer auxiliary positioning tool 1, thereby retrieving and recovering the expensive inclinometer 5 from the downhole drill string 2, leaving only the drill string 2 abandoned in the well.

[0093] When retrieving the inclinometer 5 using the retrieval inclinometer auxiliary positioning tool 1, the retrieval tool 3 can be connected to the retrieval cable 6. The retrieval tool 3 is then lowered into the downhole drilling tool 2 via the cable 6. The retrieval tool 3 is then unlocked from and connected to the retrieval inclinometer auxiliary positioning tool 1. The retrieval tool 3, the retrieval inclinometer auxiliary positioning tool 1, and the inclinometer 5 are then pulled out of the well via the cable 6, thus retrieving the retrieval inclinometer auxiliary positioning tool 1 and the inclinometer 5. If the resistance during the retrieval process may exceed the bearing capacity of the cable 6, the shear pins of the retrieval tool 3 can be used to cut and release it. At this point, the cable 6 and part of the retrieval tool 3 can be retrieved. Subsequently, a universal retrieval cylinder 4 and a sucker rod 7 are inserted into the downhole drilling tool 2. The universal retrieval cylinder 4 is used to connect the remaining retrieval tools 3 inside the downhole drilling tool 2. Then, the universal retrieval cylinder 4 is pulled outwards, thus retrieving the universal retrieval cylinder 4, part of the retrieval tools 3, the retrieval inclinometer auxiliary positioning tool 1, and the inclinometer 5. After the inclinometer auxiliary positioning fixture 1 and the inclinometer 5 are retrieved, tools can be used to disassemble each component to recover the inclinometer auxiliary positioning fixture 1 and the inclinometer 5.

[0094] The inclinometer auxiliary positioning fixture 1 provided in this application effectively prevents key detachment while possessing excellent adjustability. It allows for high-precision, wide-range adjustment of its own length, making it suitable for positioning and installing the inclinometer 5 on different types of drill strings 2. This avoids the need to manufacture different length push rod tools for different types of drill strings 2 to position and constrain the inclinometer 5, thus effectively saving costs. The inclinometer auxiliary positioning fixture 1 provided in this application also makes the inclinometer 5 retrievalable, enabling it to be retrieved in the event of a stuck drill bit accident, effectively reducing accident losses.

[0095] The drilling tools, directional survey instrument-assisted positioning fixtures, and fishing tools provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An auxiliary positioning fixture for an inclinometer (1), characterized in that, Includes a positioning rod for use in conjunction with the inclinometer (5) and installed within the drill string (2); The length of the positioning rod is adjustable; one end of the positioning rod is provided with a first connecting part for connecting the inclinometer (5), and the other end of the positioning rod is provided with a second connecting part; the second connecting part includes an openable positioning claw (11) and a positioning claw adjustment assembly for adjusting the opening and closing state of the positioning claw (11); when the positioning claw (11) is open, it expands inside the drill bit (2) to achieve locking, and when the positioning claw (11) is closed, it loosens relative to the drill bit (2) to achieve unlocking; The positioning claw adjustment assembly includes: Expanding member; the expanding member is disposed inside the positioning claw (11) and is movably installed along the axial direction of the positioning claw (11) for expanding the positioning claw (11). Expanding positioning component; the expanding positioning component is used to position the expanding component within the inner circumference of the positioning claw (11); the expanding positioning component is movable or deformable; The positioning claw adjustment assembly also includes an outer cylinder (12); the expansion positioning component includes an elastic element (14); the positioning claw (11) includes multiple pawls, all of which are located on the periphery of the outer cylinder (12); the expansion component and the elastic element (14) are both located inside the outer cylinder (12) and are distributed sequentially from the outside to the inside along the axial direction of the outer cylinder (12); the elastic element (14) extends and retracts along the axial direction of the outer cylinder (12), and one end of the elastic element (14) abuts against the shaft end of the expansion component; The expansion member includes an inner cylinder (13); the outer cylinder (12) is provided with a third connecting part for connecting the retrieval tool (3); the inner cylinder (13), the elastic element (14) and the third connecting part are distributed sequentially from the outside to the inside along the axial direction of the outer cylinder (12); the elastic element (14) is hollow, and the retrieval tool (3) can be inserted sequentially into the positioning claw (11), the inner cylinder (13) and the elastic element (14) to squeeze the elastic element (14) and connect to the third connecting part; The outer cylinder (12) is provided with a first step (121), a second step (122), and a third step (123); the first step (121), the second step (122), and the third step (123) gradually decrease in size from the outside to the inside along the axial direction of the outer cylinder (12); the outer diameter of the inner cylinder (13) is smaller than the inner diameter of the second step (122) and larger than the inner diameter of the third step (123); the other end of the elastic element (14) is fixed to the third step (123). The third connecting part is specifically a first reverse thread (15) provided on the inner wall of the third step (123). The positioning rod includes a top rod (100), a length adjuster (110), and an extension rod (120); the top rod (100), the length adjuster (110), and the extension rod (120) are distributed sequentially along the axial direction of the positioning rod and are detachably connected in pairs; the second connecting part is provided on the top rod (100), and the first connecting part is provided on the extension rod (120); the top rod (100) and the extension rod (120) are both fixed rods, and the length adjuster (110) is a telescopic rod; The length adjuster (110) includes an adjusting outer cylinder (16), an adjusting rod (17), and a connecting pin; the adjusting outer cylinder (16) and the adjusting rod (17) are sleeved on each other and movably connected along the axial direction; the adjusting outer cylinder (16) is provided with a pin hole (161) on its periphery, and the adjusting rod (17) is provided with an axially extending positioning groove (171) on its periphery; the connecting pin passes through the pin hole (161) and is embedded in and presses against the positioning groove (171) to achieve relative fixation between the adjusting outer cylinder (16) and the adjusting rod (17); The adjusting outer cylinder (16) is provided with a first connecting thread (162); the adjusting rod (17) includes a connecting rod (172) and a connecting sleeve (173), the connecting rod (172) is provided with a second connecting thread (174) for connecting the first connecting thread (162), and the connecting sleeve (173) is provided with a through hole (175) that runs radially through.

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