Adjustable compensation sleeve system for drill collar maintenance and use method

Abstract

According to the adjustable compensation sleeve system for drill collar maintenance and the using method, the length deviation of drill collar maintenance can be accurately compensated, the size change of key core parts after drill collar maintenance is avoided by replacing the adjusting sleeve which is low in price and convenient to disassemble and assemble, the maintenance efficiency can be remarkably improved through the newly-designed lower adjusting sleeve and the newly-designed disassembling tool, and the maintenance cost is reduced. The split type compensation device comprises a split type compensation assembly composed of an upper adjusting sleeve and a lower adjusting sleeve, and the upper adjusting sleeve and the lower adjusting sleeve are detachably connected. The length of the upper adjusting sleeve and the length of the lower adjusting sleeve meet the relational expression: Lupper = Loriginal-(x + y) + / -0.5 mm; llower = Loriginal + y + / -0.5 mm; the assembly method comprises the following steps: measuring the axial deviation value delta L of the maintained drill collar according to the formula: delta L = x + y; determining an assembling scheme of the upper adjusting sleeve and the lower adjusting sleeve according to the calculation model of the compensation assembly; the dismounting method comprises the following steps: separating the split type compensation assembly by using a special tool, and adopting a thread transmission type dismounting tool when D is greater than 100mm; and when D is less than or equal to 100mm, a drawing type dismounting tool is adopted.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling equipment maintenance. Specifically, it relates to an adjustable compensation sleeve system for drill collar maintenance and its assembly method, which is particularly suitable for repairing drill collar components whose lengths change due to wear. Background Art

[0002] The drill collar is a key tool in the oil drilling process. Since a fluxgate sensor is installed inside, the drill collar needs to be made of non-magnetic material to avoid magnetic interference, and also needs to meet requirements such as high anti-torsion, anti-compression, and corrosion resistance. Generally, non-magnetic stainless steel materials such as P550, 15-15, and 718 are used, and the material cost is high. The service conditions are harsh and it needs to be repaired frequently.

[0003] During maintenance, operations such as threading and cladding will change the original length of the drill collar. This length change will further affect the positions of the internal parts, resulting in an imbalance in the overall structure. If the dimensions of the core key components inside the drill collar are changed, the cost will be high. Therefore, it is very necessary to design an adjustment sleeve and a special disassembly tooling that are inexpensive and easy to disassemble, and to ensure that the dimensions and positions of the core key components remain unchanged after the drill collar is repaired by changing the size of the adjustment sleeve, while also improving the drill collar maintenance efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide an adjustable compensation sleeve system for drill collar maintenance and its usage method, which can accurately compensate for the length deviation of drill collar maintenance, avoid changing the dimensions of the core key components after drill collar maintenance by replacing an inexpensive and easy-to-disassemble adjustment sleeve. The newly designed lower adjustment sleeve and disassembly tooling can significantly improve the maintenance efficiency, reduce the maintenance cost and the maintenance cycle, so as to meet the requirements during the maintenance of oil equipment.

[0005] The embodiments of the present invention are implemented as follows: An adjustable compensation sleeve system for drill collar maintenance, which includes: A split compensation component, which consists of an upper adjustment sleeve and a lower adjustment sleeve that are detachably connected; The length of the upper adjustment sleeve satisfies the relational expression: L_upper = L_original - (x + y) ± 0.5 mm; The length of the lower adjustment sleeve satisfies the relational expression: L_lower = L_original + y ± 0.5 mm; where L_original is the original length reference value of the drill collar, x is the amount of material removed from the upper end face of the drill collar during maintenance, and y is the amount of material removed from the lower end face of the drill collar during maintenance.

[0006] In a preferred embodiment of the present invention, the above-mentioned lower adjustment sleeve includes: When the diameter D > 100 mm, the inner wall is provided with a low-profile ACME thread with a pressure angle of 10° ± 0.5° and a lead angle ≤ 5°, and the thread depth h satisfies h = (0.3 - 0.4)T, where T is the wall thickness of the lower adjustment sleeve. When the diameter D ≤ 100 mm, at least one annular compensation groove is provided on the inner wall, and the depth d of the compensation groove satisfies d = (0.2 - 0.3)T, where T is the wall thickness of the lower adjusting sleeve.

[0007] In a preferred embodiment of the present invention, the above-mentioned compensation groove includes: An annular groove continuous in the circumferential direction; or A circumferential array composed of 2N sector grooves, 2N ≥ 2 and the adjacent groove spacing angle α ≤ 90°.

[0008] A usage method of an adjustable compensation sleeve system for drill collar maintenance, including the adjustable compensation sleeve system described in any one of the foregoing, comprising the following steps: Measure the axial deviation ΔL of the drill collar after maintenance, ΔL = x + y; Determine the matching scheme of the upper adjusting sleeve and the lower adjusting sleeve according to the calculation model of the compensation component; Install the compensation component onto the drill collar through a thermal expansion assembly process; Use a special tooling to separate the split compensation component, Among them, when D > 100 mm, a threaded drive disassembly tooling is adopted; when D ≤ 100 mm, a pull-out disassembly tooling is adopted.

[0009] In a preferred embodiment of the present invention, the above-mentioned threaded drive disassembly tooling includes: A male thread socket, a through hole is provided through the axis of the male thread socket, and an external thread matching the end face of the drill collar is provided on the outer wall, and the male thread socket is assembled to the male thread end of the drill collar; An ejection component, fixedly assembled on the male thread socket, and the movable part of the ejection component makes a rotational motion to a linear motion in the through hole; An extension rod, one end of which is detachably connected to the movable part of the ejection component, and the ejection component ejects the extension rod; A connecting sleeve, one end of which is detachably connected to the extension rod, and the outer wall near the end face is provided with a low tooth thread to connect the lower adjusting sleeve of the drill collar; one or more straightening areas are provided on the outer wall of the connecting sleeve, and when the extension rod is ejected, the lower adjusting sleeve connected to the connecting sleeve and the drill collar are loosened.

[0010] In a preferred embodiment of the present invention, the above-mentioned ejection component includes: A ball screw, the flange of the ball screw is detachably connected to the end face of the male thread socket, and the screw rod of the ball screw passes through the flange and is inserted into the through hole; A screw adapter, a threaded hole for the screw rod to pass through is provided in the middle axis of the screw adapter; A thrust bearing, the outer ring of the thrust bearing is fixedly connected to the inner wall of the through hole; The bearing rod has one end in the shape of a slender cylinder, which passes through the inner ring of the thrust bearing and is connected to the screw adapter; the other end is in the shape of a cylindrical groove body, and a first internal thread groove is provided on the inner axis thereof for detachably connecting with the extension rod. When the screw rotates, the bearing rod is pushed out.

[0011] In a preferred embodiment of the present invention, the above-mentioned pull-out type disassembly tooling includes: An extension rod, which is a slender rod body. The first end of the extension rod is connected to the adapter. An assembly groove is provided on the first end face of the adapter along the central axis direction. The length of the assembly groove is greater than or equal to the diameter of the adapter. The assembly groove divides the adapter into two symmetrical rotating seats, and a first rotating pin assembly hole is provided on the rotating seat. A pull head, which includes a connecting portion and pull-out portions provided on both sides of the connecting portion. A second rotating pin assembly hole is provided on the connecting portion. After the rotating pin is sequentially assembled in the first rotating pin assembly hole, the second rotating pin assembly hole and the first rotating pin assembly hole, the whole pull head can rotate within a certain range based on the adapter.

[0012] In a preferred embodiment of the present invention, the thickness t of the above-mentioned pull-out portion and the depth d of the compensation groove satisfy t = (0.85 - 0.9)d.

[0013] In a preferred embodiment of the present invention, the above-mentioned pull-out tooling further includes: A head end, which is assembled at the second end of the extension rod and is detachably connected to the extension rod; A slider, which is sleeved on the extension rod and can slide on the extension rod.

[0014] In a preferred embodiment of the present invention, the usage method of the above-mentioned pull-out tooling is as follows: Assemble the pull head on the adapter with a rotating pin. The extension rod is clamped with the adapter. Hold the extension rod by hand and insert the pull-out tooling into the inner hole of the adjusting sleeve until it touches the groove of the lower adjusting sleeve; Rotate the extension rod clockwise to lock the pull head in the groove of the adjusting sleeve and fix it, and then apply force axially and slowly pull the extension rod by hand to pull out the lower adjusting sleeve.

[0015] When there is sludge adhesion and jamming during processing and the lower adjusting sleeve cannot be pulled out: Assemble the slider and the head end on the extension rod in sequence. Slide the slider on the extension rod multiple times to impact the head end, loosen the lower adjusting sleeve, and pull the extension rod to disassemble the lower adjusting sleeve.

[0016] The beneficial effects of the embodiments of the present invention are: 1. Design a split-type compensation component inside the drill collar to accurately compensate for the length deviation of the drill collar caused by maintenance, ensure the balance of the overall structure, only need to replace the low-cost adjusting sleeve, without modifying the core internal components of the drill collar (such as pulsators, etc.), and significantly reduce the maintenance cost; 2. The upper and lower adjusting sleeves can be replaced independently. The upper adjusting sleeve is easy to disassemble, and the lower adjusting sleeve can be efficiently disassembled and assembled through a special tooling, solving the problem of difficult disassembly of the traditional lower adjusting sleeve and meeting the requirements of different maintenance scenarios. According to the difference in drill collar diameter (D > 100 mm or D ≤ 100 mm), the lower adjusting sleeve adopts a low-tooth thread or a compensating groove design to cover the full-size requirements. 3. A professional tooling is used to disassemble the lower adjusting sleeve, greatly improving the maintenance efficiency of the drill collar. For the thread-driven tooling, for large-diameter adjusting sleeves, mechanical structures such as ball screws + thrust bearings are adopted, and the lower adjusting sleeve is ejected by rotating transmission to avoid component damage caused by violent disassembly. For the pulling tooling, for small-diameter adjusting sleeves, a rotatable pulling head is designed to engage with the compensating groove, and a slider is used to impact and loosen the bonded components to solve the problem of mud jamming and shorten the maintenance cycle. 4. The adjusting sleeve is produced by standardization, and the cost is much lower than that of the core components of the drill collar, reducing the investment in maintenance spare parts and the material cost. The disassembly efficiency is greatly improved, reducing the manual time-consuming, ensuring the continuity of oil drilling operations, indirectly increasing production capacity, and shortening the maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a length compensation relationship diagram of the adjustable compensation sleeve system for drill collar maintenance in Embodiment 1 of the present invention; Figure 2 It is a schematic diagram of the position of the lower adjusting sleeve in the drill collar in Embodiment 1 of the present invention; Figure 3 It is an assembly structure diagram of the thread-driven disassembly tooling and the large lower adjusting sleeve in Embodiment 2 of the present invention; Figure 4 It is a schematic diagram of the connection sleeve structure in Embodiment 2 of the present invention; Figure 5 It is a schematic diagram of the structure of the thread-driven disassembly tooling in Embodiment 2 of the present invention; Figure 6 It is a relationship diagram of the thickness of the lower adjusting sleeve and the thickness of the groove in Embodiment 3 of the present invention; Figure 7 It is a schematic diagram of the structure of the pulling disassembly tooling in Embodiment 3 of the present invention; Figure 8 It is a schematic diagram of the adapter structure in Embodiment 3 of the present invention; Figure 9Schematic diagram of the drawing head structure according to Embodiment 3 of the present invention.

[0019] Icon: Upper end face A of the drill collar; lower end face B of the drill collar; forward compensation distance C of the lower compensation sleeve; composite compensation distance D of the upper compensation sleeve; distance E from the position of the key components to the end face of the drill collar; position F of the lower adjusting sleeve in the drill collar; Thread drive type disassembly tooling: Thread male seat 110; ejection assembly 120; ball screw 121; flange 1211; screw rod 1212; screw joint 122; thrust bearing 123; bearing rod 124; extension rod 130; connecting sleeve 140; short tooth thread 141; straightening area 142; Pull type disassembly tooling: Extension rod 130; adapter 150; assembly groove 151; rotating seat 152; first rotating pin assembly hole 153; vertical side 1511; first horizontal bottom surface 1512; inclined bottom surface 1513; second horizontal bottom surface 1514; drawing head 160; connecting part 161; drawing part 162; second rotating pin assembly hole 163; auxiliary disassembly assembly 170; end 171; slider 172. Specific embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0022] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0024] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0025] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] First Embodiment This embodiment provides an adjustable compensation sleeve system for drill collar maintenance, which includes: A split compensation component, which consists of an upper adjusting sleeve and a lower adjusting sleeve that are detachably connected; The length of the upper adjusting sleeve satisfies the relationship: L_up = L_original - (x + y) ± 0.5 mm; The length of the lower adjusting sleeve satisfies the relationship: L_down = L_original + y ± 0.5 mm; where L_original is the original length reference value of the drill collar, x is the removal amount of the upper end face of the drill collar during maintenance, and y is the removal amount of the lower end face of the drill collar during maintenance.

[0027] After the drill collar is maintained, the relative positions of the key internal components (such as pulsators) of the drill collar will change. To ensure that the positions of the key internal components remain unchanged and the dimensions are not altered, in this embodiment, two adjustable sleeves (an upper adjusting sleeve and a lower adjusting sleeve) that are convenient for disassembly are designed at both ends of the key components. Through split-type precise compensation, by customizing the dimensions of the two adjustable sleeves during use, the positions of the key components can be ensured not to change.

[0028] In this embodiment, axial positioning compensation of key components (such as MWD pulse generators) is achieved through the synergistic effect of double compensation sleeves: the lower compensation sleeve adopts a positive compensation design to offset the dimensional deviation in the y direction; the upper compensation sleeve implements negative compensation to synchronously correct the x + y composite deviation; the compensation accuracy reaches ±0.03 mm / m, meeting the downhole tool positioning requirements specified in ISO 10424-1:2004.

[0029] For details, please refer to Figure 1 , after maintenance, the length of the upper end face A of the drill collar is reduced by x, and the length of the lower end face B of the drill collar is reduced by y. A pulser is installed inside the drill collar. The pulser is expensive and the distance from the lower end face of the drill collar needs to be ensured. Therefore, the positive compensation distance C of the lower compensation sleeve is: increase the size of the lower adjusting sleeve by y to ensure the distance between the pulser and the lower end face of the drill collar; the composite compensation D of the upper compensation sleeve is: reduce the size of the upper adjusting sleeve by x + y to ensure that the drill collar matching the upper end face can press the upper adjusting sleeve. In this embodiment, the upper and lower adjusting sleeves can be designed according to the maintenance range, as long as the size of the upper adjusting sleeve > x + y and the size of the lower adjusting sleeve > y. The distance E from the position of the key components to the drill collar end face needs to remain unchanged.

[0030] In practical applications, the upper adjusting sleeve is relatively easy to disassemble. The internal parts of the drill collar (except the lower adjusting sleeve) can be pushed out by a simple tooling to push the pulser assembly at the lower end face of the drill collar. However, due to the special installation position of the lower adjusting sleeve, please refer to Figure 2 , the position F of the lower adjusting sleeve in the drill collar. To ensure the continuity of the flow channel, it is necessary to ensure that the internal step size of the lower adjusting sleeve and the drill collar is the same. The distances from the lower adjusting sleeve to the upper and lower end faces of the drill collar are both greater than 1 m, and there is no point or structure to push out the lower adjusting sleeve, making it difficult to disassemble.

[0031] Therefore, in order to enhance the disassembly convenience of the lower adjusting sleeve, a series of innovative improvement designs are carried out on the lower adjusting sleeve in this embodiment.

[0032] The lower adjusting sleeve includes: When the diameter D > 100 mm, the inner wall is provided with low-profile ACME threads with a pressure angle of 10° ± 0.5° and a lead angle ≤ 5°, and the thread depth h satisfies h = (0.3 - 0.4)T, where T is the wall thickness of the lower adjusting sleeve; When the diameter D ≤ 100 mm, at least one annular compensation groove is provided on the inner wall, and the compensation groove depth d satisfies d = (0.2 - 0.3)T, where T is the wall thickness of the lower adjusting sleeve.

[0033] For the lower adjusting sleeve used in large drill collars, due to its large outer diameter, long length, and thick wall thickness, the contact area between the lower adjusting sleeve and the inner wall of the drill collar is large during the maintenance process. After the mud dries, the disassembly force will increase significantly. Therefore, in this embodiment, a thread design is introduced inside the lower adjusting sleeve. Preferably, a low-profile ACME thread suitable for the inner diameter of the drill collar is selected. It has the advantages of not being easily driven in the reverse direction, good bearing capacity, and a relatively low tooth height, which can be used for thin-walled adjusting sleeves. And corresponding supporting tooling is developed to achieve the easy disassembly of the adjusting sleeve through threaded connection.

[0034] For the lower adjusting sleeve used in small drill collars, due to its small outer diameter, short length, and thin wall thickness, the contact area with the inner wall of the drill collar is small, and the disassembly force is relatively low. However, due to size limitations and other reasons, it is impossible to machine threads on the lower adjusting sleeve. To address this challenge, in this embodiment, a specific compensation groove structure is designed inside the lower adjusting sleeve, and a special tooling device is designed in cooperation. These grooves are used to achieve the disassembly of the adjusting sleeve.

[0035] Further, the compensation grooves include: A circumferentially continuous annular groove; or A circumferential array composed of 2N sector grooves, where 2N≥2 and the angular spacing α between adjacent grooves ≤90°.

[0036] The compensation grooves are also determined according to the size, length, and thickness of the small lower adjusting sleeve. Preferably, for a lower adjusting sleeve with a diameter of 90 - 100 mm, a continuous annular groove is axially provided; for a lower adjusting sleeve with a diameter below 90 mm, multiple sector grooves distributed in a circular array are used.

[0037] This embodiment also provides a method for using an adjustable compensation sleeve system for drill collar maintenance, including the following steps: Measure the axial deviation ΔL of the drill collar after maintenance, ΔL = x + y; Determine the matching scheme of the upper adjusting sleeve and the lower adjusting sleeve according to the calculation model of the compensation component; Install the compensation component onto the drill collar through a thermal expansion assembly process; Use a special tooling to separate the split compensation component, wherein, when D > 100 mm, a threaded drive disassembly tooling is used; when D ≤ 100 mm, a pulling disassembly tooling is used.

[0038] The following details the specific usage methods of various types of lower adjusting sleeves and various types of lower adjusting sleeve disassembly toolings.

[0039] Second Embodiment The contact area between the large lower adjusting sleeve 1 and the inner wall of the drill collar is relatively large. After the mud dries, the disassembly force will increase significantly. Therefore, in this embodiment, a thread design is introduced inside the lower adjusting sleeve 1, and a matching tooling is designed to pull it out.

[0040] However, there are still the following problems in disassembling the adjusting sleeve: 1. The depths of the lower adjusting sleeve 1 from both end faces are greater than 1 m. What kind of movement mode should the disassembly tooling adopt to enter the drill collar chamber? 2. How can the disassembly tooling tighten the thread fasteners inside? 3. The required disassembly force is relatively large. How can other tools be used to reduce the disassembly difficulty? In the face of the above problems, this embodiment designs a brand-new lower adjusting sleeve 1 and matching tooling. For details, see Figures 3 - 5 .

[0041] The thread drive type disassembly tooling includes: A male thread seat 110. A through hole is provided at the axis of the male thread seat 110, and an external thread matching the drill collar end face is provided on the outer wall. The male thread seat 110 is assembled on the male thread end of the drill collar; a through hole is provided at the axis position of the male thread seat 110 for assembling the ejection assembly. Further, in order to reduce the wear, fix the position, bear the sliding, dissipate heat, and reduce friction between the ejection assembly and the male thread seat 110, a modular bushing can also be designed inside the through hole.

[0042] An ejection assembly 120, fixedly assembled on the male thread seat 110, and the movable part of the ejection assembly 120 makes a rotary motion or a linear motion inside the through hole; in actual operation, we found that after the mud dries on the maintenance drill collar and the adjusting sleeve, the disassembly force will increase significantly. Once it is loosened, the subsequent disassembly force will be significantly reduced. To save the tooling cost and reduce the tooling volume, the stroke of the ball screw 5 is only designed to be a very short section. Preferably, the ejection stroke of the ejection assembly 120 is 8 - 15 mm. In this embodiment, a precision screw with a lead of 4 - 6 mm is used, and a 10 mm ejection stroke can break through the initial disassembly force; An extension rod 130, one end of which is detachably connected to the movable part of the ejection assembly 120, and the ejection assembly 120 ejects the extension rod 130; both ends of the extension rod 130 adopt a detachable connection structure, which can be selected as a threaded connection or a snap connection; the extension rod 130 can be made of duplex stainless steel, such as 2205 DSS, with the Cl⁻ corrosion resistance improved by 60%, which can improve the service life of the extension rod 130. At the same time, it meets the requirements of use strength and light weight.

[0043] A connecting sleeve 140, one end of which is detachably connected to the extension rod 130, and the outer wall near the end face at the other end is provided with a low-pitch thread 141 to connect the lower adjusting sleeve 1 of the drill collar; one or more straightening areas 142 are provided on the outer wall of the connecting sleeve 140. When the extension rod 130 is ejected, the lower adjusting sleeve 1 connected to the connecting sleeve 140 and the drill collar are pried loose.

[0044] Due to the thin wall of the lower adjusting sleeve 1, in this embodiment, the thread of the thread groove is selected as the stub ACME thread, and the tooth height is 50%-70% of the standard ACME thread, which is convenient for connection and protects the lower adjusting sleeve 1 at the same time. The pitch can be selected according to the standard of the ACME thread and matched with the outer diameter. The thread groove and the lower adjusting sleeve 1 are in clearance fit, and the tolerance is 5H / 5g6g or 7H / 7g6g to accommodate mud residues. In order to enhance the reliability of the tooling in a highly corrosive mud environment, the connecting sleeve 140 is also treated with a PTFE coating, and the coating thickness is 50-80μm to reduce the mud adhesion rate.

[0045] The connecting sleeve 140 has two centralizing areas 142, so that the connecting sleeve 140 can always be centered in the drill collar chamber, which is convenient for the connecting sleeve 140 to be centered and threadedly connected to the lower adjusting sleeve 1. In this embodiment, since the extension rod 130 performs linear motion rather than rotational motion, a threaded connection is selected between the extension rod 130 and the connecting sleeve 140. Of course, other connection methods such as clamping can also be selected to stably connect with the connecting sleeve 140.

[0046] In the prior art, when generally disassembling a pipe fitting with threads, it is often thought to use a rotating method (for example, using a long rod with external threads to connect to the internal threads of the lower adjusting sleeve 1 and then pull out) to loosen the pipe fitting. However, in the actual test process, we found that such a method would cause: ① The thread profile of the lower adjusting sleeve 1 is easily damaged, and without the action of a guiding mechanism, etc., the rod with external threads is forced to connect to the internal threads of the lower adjusting sleeve 1, resulting in severe friction, causing the thread tips of the lower adjusting sleeve 1 to wear, deform or even break (collapse of teeth), forming a "slipped thread" phenomenon, and it is not easy to take out the lower adjusting sleeve 1; ② It is very easy to cause thread misalignment. The misaligned threads may form local gaps, and even if there is no leakage temporarily, they may crack due to stress concentration after long-term pressure, and the gap of the lower adjusting sleeve 1 expands; ③ Stress concentration occurs in the lower adjusting sleeve 1. The misaligned thread teeth will bear abnormal stress, which may cause microcracks and gradually expand, ultimately leading to fatigue failure of the pipe fitting; ④ The lower adjusting sleeve 1 expands and cracks. A pipe fitting with external threads without other structures may cause the lower thin-walled pipe fitting to expand, deform or crack due to excessive radial stress, resulting in the lower adjusting sleeve 1 being unable to be disassembled; ⑤ For the large drill collar lower adjusting sleeve 1, the rod with external threads used is large in volume and heavy in weight, which is not convenient to use; ⑥ During the insertion process of the rod, it is easy to scratch other electronic sensors in the drill collar inner cavity, affecting the use of the equipment.

[0047] Therefore, a jacking assembly 120 and a male thread seat 110 are specifically redesigned to prevent the above situations from occurring. The jacking assembly 120 includes: Ball screw 121, the flange 1211 of the ball screw 121 is detachably connected to the end face of the male thread seat 110. In this embodiment, screw fastening is adopted. The screw rod 1212 of the ball screw 121 passes through the flange 1211 and is inserted into the through hole. When the ball screw rotates, the relative position with the flange 1211 is adjusted; Screw adapter 122, a threaded hole for the screw rod 1212 to pass through is provided in the central axis of the screw adapter 122, which is used for assembling the ball screw and the bearing rod; Thrust bearing 123, the outer ring of the thrust bearing 123 is fixedly connected to the inner wall of the through hole, and the inner ring is assembled with the bearing rod, converting the rotational motion of the ball screw into the linear motion of the bearing rod, so as to drive the extension rod 130 to do linear motion; Bearing rod 124, one end is a slender cylinder, which is used to pass through the inner ring of the thrust bearing 123 and connect to the screw adapter 122; the other end is a cylindrical groove body, and a first internal thread groove is arranged on the inner central axis, which is detachably connected to the extension rod 130; when the screw rod 1212 rotates, the bearing rod 124 is pushed out.

[0048] More specifically, the screw adapter 122 is integrally cylindrical. One end is provided with a first slot hole for threaded connection with the screw rod 1212, and the other end is provided with a second slot hole for sliding connection with the bearing rod 124. The inner diameter of the first slot hole is larger than that of the second slot hole. Part of the bearing rod 124 penetrates into the first slot hole, and internal threads are arranged on the inner wall of the first slot hole. The first slot hole here is used to connect the screw rod 1212, and the second slot hole is used for the assembly, limitation and guidance of the bearing rod 124.

[0049] Of course, the end of the ball screw can also be designed in a stepped manner, that is, a rod body is coaxially arranged at the end of the screw rod 1212, and the bearing rod 124 can be pushed out through the second slot hole. In this way, it is not necessary for part of the bearing rod 124 to penetrate into the first slot hole.

[0050] In order to enhance the reliability of the tooling under low-temperature working conditions, low-temperature grease is filled in the cavity of the thrust bearing 123, and the viscosity at -40°C ≤ 150 cSt. The other end of the bearing rod 124 is a cylindrical groove body, and a first internal thread groove is arranged on the inner central axis, which is detachably connected to the extension rod 130; thus, when the screw rod 1212 rotates, the bearing rod 124 is pushed out safely and stably.

[0051] During the disassembly process, if the ball screw 121 is directly connected to the extension rod 130, it is easy to cause loosening of the threads of the extension rod 130, the connecting sleeve 140, and the lower adjusting sleeve 1. To avoid this phenomenon, a thrust bearing 123 is installed between the ball screw 121 and the extension rod 130 to prevent the rotation of the ball screw 121 from driving the extension rod 130 to rotate and release the buckle, and the extension rod 130 only makes a linear motion.

[0052] The male thread socket 110 of the thread is integrally structured with a frustum extending coaxially from the end face of a cylinder, and its overall shape matches the internal shape of the male thread end face of the drill collar. The outer wall of the male thread socket 110 is designed with threads. Since the threads inside the drill collar adopt the NC series digital threads of the API standard, the male thread socket threads also use the matching API standard digital series threads, so that the male thread socket 110 can be stably assembled at the male thread end of the drill collar to ensure the stability of the use of the entire tooling, prevent the damage of the inner cavity of the drill collar during the use of the tooling, and ensure the effective connection between the connecting sleeve 140 and the lower adjusting sleeve 1.

[0053] The usage method of the thread drive type disassembly tooling is as follows: Connect the extension rod 130 to the connecting sleeve 140. After the two are fixedly assembled, hold one end of the extension rod 130 and insert the connecting sleeve 140 into the drill collar. During the insertion process, the centering area 142 of the connecting sleeve 140 contacts the inner wall of the drill collar. Manually rotate the extension rod 130 to make the ACME thread of the connecting sleeve 140 engage with the lower adjusting sleeve 1. Assemble the bearing rod 124 onto the extension rod 130, and sequentially assemble the thrust bearing 123 and the lead screw adapter 122. Install the male thread socket 110 on the end face of the drill collar. After assembling the screw rod 1212 of the ball screw onto the lead screw adapter 122, fix the flange 1211 of the ball screw on the male thread socket 110 with screws, and the tooling assembly is completed.

[0054] Rotate the lead screw to generate a 10 mm ejection stroke. After loosening the lower adjusting sleeve 1, the disassembly work can be started. The method is as follows: Sequentially disassemble the ball screw, the male thread socket 110, the lead screw adapter 122, the thrust bearing 123 and the bearing rod 124. Directly pull the extension rod 130 by hand, and pull out the extension rod 130, the connecting sleeve 140 and the lower adjusting sleeve 1 together.

[0055] The operation time is shortened from the original 2 - 3 hours to 20 - 30 minutes, greatly improving the work efficiency.

[0056] Furthermore, an electric drive mode can also be selected to control the ball screw. An integrated power module is adopted, the ball screw 121 is directly connected to a brushless motor, and a built-in lithium battery pack is provided with a battery life of ≥4h. Manual operation is reduced, and it is convenient for the assembly and reset of the ball screw, etc. The motor is built-in with speed regulation and emergency reverse functions.

[0057] The third embodiment For the lower adjusting sleeve 1 of the small drill collar, due to its relatively small outer diameter, short length, and thin wall thickness, the contact area with the inner wall of the drill collar is small, and the disassembly force is relatively low. However, due to reasons such as size limitations, it is impossible to machine threads on the small lower adjusting sleeve 1. To address this challenge, in this embodiment, a specific compensation groove structure is designed inside the lower adjusting sleeve 1, and a special tooling device is designed in cooperation. These grooves are used to achieve the disassembly of the adjusting sleeve.

[0058] The lower adjusting sleeve 1 includes: The compensation grooves include: When the diameter 90 < D ≤ 100 mm, a circumferentially continuous annular groove; or When the diameter D ≤ 90 mm, a circumferential array composed of 2N sector grooves, 2N ≥ 2 and the adjacent groove spacing angle α ≤ 90°. The number of sector grooves needs to be an even number, preferably 4 or 6. The number of sector grooves can be reduced to reduce the processing data of the lower adjusting sleeve 1 and ensure the strength of the lower adjusting sleeve 1. At the same time, it is also convenient for the pull-out type disassembly tooling to be inserted into the lower adjusting sleeve 1.

[0059] The depth d of the compensation groove satisfies d = (0.2 - 0.3)T, where T is the wall thickness of the lower adjusting sleeve 1.

[0060] For example, please refer to Figure 6 , in this embodiment, the lower adjusting sleeve 1 with a diameter of 75 mm and an inner diameter of 71 mm is taken as an example, and the thickness is 4 mm. Four sector grooves with an inscribed circle diameter of 72 mm (0~+0.2 mm) and an inner diameter of 73 mm are machined inside the lower adjusting sleeve 1, and the depth d of the compensation groove is 1 mm (0~+0.2 mm). The diameter of the pull-out head is designed to be 72 mm (0~-0.2 mm), so as to ensure that the pull-out head of the lower adjusting sleeve 1 can rotate around the rotating pin and enter the inside of the groove, and it can also ensure that the pull-out head of the lower adjusting sleeve 1 can be stuck in the sector groove.

[0061] However, even if compensation grooves are designed on the lower adjusting sleeve 1, there are still the following difficulties in disassembling the small lower adjusting sleeve 1: 1. The depth of the lower adjusting sleeve 1 from the end face is greater than 1 m, and the diameter is smaller than that of the large lower adjusting sleeve 1. How to penetrate into the inner cavity of the drill collar without easily damaging the internal equipment of the drill collar? 2. How can the tooling penetrate into the inside of the groove and be stuck with the groove? 3. Although the disassembly force is small, how to complete the removal of the lower adjusting sleeve 1 when it is stuck in special cases? In the face of the above problems, this embodiment designs a brand-new adjusting sleeve and a matching pulling-type disassembly tooling, as shown in Figures 7-9. By making a pulling head that can rotate at the front end, after the tooling is inserted into the adjusting sleeve, even if the pulling head touches the inner cavity of the drill collar, it will quickly turn. Also, when inserting, by adjusting the angle of the pulling head, the pulling head and the extension rod 130 can be in an inclined state instead of a vertical state, reducing the occurrence of contact. After insertion, one end of the pulling head abuts against the groove in the adjusting sleeve. With a little force, the rotating pin can rotate, and the pulling head rotates in an arc and is stuck in the compensation groove and then is locked. Then, the adjusting sleeve 1 can be removed by hand pulling.

[0062] Specifically, the pulling-type disassembly tooling includes: an extension rod 130, a pulling head 160 and an auxiliary disassembly component 170 respectively arranged at both ends of the extension rod 130.

[0063] The extension rod 130 is a slender rod body. The first end of the extension rod 130 is connected to a swivel joint 150. An assembly groove 151 is arranged along the central axis direction on the first end face of the swivel joint 150. The length of the assembly groove 151 is greater than or equal to the diameter of the swivel joint 150. The assembly groove 151 divides the swivel joint 150 into two symmetrical rotating seats 152. A first rotating pin assembly hole 153 is arranged on the rotating seat 152.

[0064] The assembly groove 151 includes two vertical side faces 1511, a first horizontal bottom face 1512, an inclined bottom face 1513 and a second horizontal bottom face 1514. The two vertical side faces 1511 are respectively located on the two rotating seats 152. The first horizontal bottom face 1512 and the second horizontal bottom face 1514 are respectively located on the two open side faces of the assembly groove 151. Among them, the distance from the first horizontal bottom face 1512 to the end face is less than the distance from the second horizontal bottom face 1514 to the end face. The first horizontal bottom face 1512 and the second horizontal bottom face 1514 are connected by the inclined bottom face 1513. The included angle between the inclined bottom face 1513 and the horizontal plane is 45°±2°, and the groove depth tolerance is ±0.05mm.

[0065] The assembly groove 151 adopts an asymmetric stepped assembly groove 151 design, with a groove depth tolerance of ±0.05mm, and is made of 17-4PH stainless steel material to achieve a bending strength of 150MPa while maintaining the thin-wall structure of the rotating seat 152.

[0066] The pulling head 160 includes an integrally formed connecting portion 161 and pulling portions 162 arranged on both sides of the connecting portion 161. A second rotating pin assembly hole 163 is arranged on the connecting portion 161. After the rotating pin 180 is sequentially assembled in the first rotating pin assembly hole 153, the second rotating pin assembly hole 163 and the first rotating pin assembly hole 153, the whole pulling head 160 can rotate within a certain range based on the swivel joint 150.

[0067] The end of the drawing part 162 is arc-shaped. The arc-transition edge design reduces the contact stress by 40%. Coupled with surface sandblasting treatment (Ra3.2), the anti-slip effect is further improved. The thickness t of the drawing part 162 and the depth d of the compensation groove satisfy t = (0.85 - 0.9)d, which can ensure that the drawing part 162 can be smoothly clamped into the compensation groove.

[0068] The drawing tooling in this embodiment further includes an auxiliary disassembly component 170, including: A head 171, assembled at the second end of the extension rod 130, detachably connected to the extension rod 130. In this embodiment, threaded connection is selected to prevent the head 171 from being knocked off during the impact process; A slider 172, sleeved on the extension rod 130 and slidable on the extension rod 130.

[0069] Dual-mode power output is adopted: in the normal state, direct drawing (≤200N) is used, and in the special stuck state, the sledgehammer impact mode is enabled (the maximum impact force can reach 1200N) to achieve hierarchical force application; the mass of the slider 172 and the length of the extension rod 130 are dynamically matched to ensure effective transmission of the impact energy (the energy conversion efficiency is over 85%).

[0070] The usage method of the drawing tooling is as follows: Assemble the drawing head 160 on the adapter 150 with a rotary pin. The extension rod 130 is clamped to the adapter 150. Hold the extension rod 130 and insert the drawing tooling into the inner hole of the adjusting sleeve until it contacts the groove of the lower adjusting sleeve 1. Rotate the extension rod 130 clockwise to lock the drawing head 160 in the groove of the adjusting sleeve, and then slowly apply force axially by hand to pull out the lower adjusting sleeve 1 with the extension rod 130.

[0071] When there is adhesion and jamming due to treatment mud and the lower adjusting sleeve 1 cannot be pulled out: Assemble the slider 172 and the head 171 on the extension rod 130 in sequence. Slide the slider 172 on the extension rod 130 multiple times to impact the head 171, loosen the lower adjusting sleeve 1, and then pull the extension rod 130 to remove the lower adjusting sleeve 1.

[0072] Furthermore, the extension rod 130 can also adopt a segmented threaded connection. The length of each segment can be customized, such as 0.5m / segment, and is connected by a high-strength alloy threaded joint. In this way, it can adapt to different depths (≥1m) and reduce the occupation of transportation and storage space.

[0073] An ultrasonic transducer can also be embedded inside the adapter 150, with a frequency of 28 kHz and an amplitude of 50 μm, generating axial high-frequency micro-vibrations through piezoelectric ceramics to break the oxide bonding layer between the adjusting sleeve and the inner wall of the drill collar; it starts synchronously with the pulling action, reducing the static friction coefficient by more than 60%. The ultrasonic transducer is provided with a wireless transmission unit, which exchanges data with the handheld terminal through the ZigBee protocol, so that the handheld terminal can control the ultrasonic transducer.

[0074] A multi-stage self-aligning guide ring can also be installed at the front end of the extension rod 130. For example, a conical guide head (cone angle 15°) can be designed at the first stage for rough positioning; an elastic petal-shaped guide flap can be designed at the second stage to adapt to the aperture tolerance of ±0.3 mm, avoiding hard contact between the conical guide head and the pulling head 160 and the inner part of the drill collar. Multiple elastic petal-shaped guide flaps can be set; a ball bearing guide sleeve can be designed at the third stage, which is closer to the end 171, and it is assembled on the end 171 of the drill collar to ensure that the coaxiality between the pulling head 160 and the adjusting sleeve is ≤0.05 mm, thus realizing self-adaptive centering guidance.

[0075] In summary, the adjustable compensation sleeve system and its usage method for drill collar maintenance disclosed in this embodiment have the following advantages: 1. A split-type compensation component is designed inside the drill collar to accurately compensate for the length deviation of the drill collar caused by maintenance, ensuring the balance of the overall structure. Only the low-cost adjusting sleeve needs to be replaced, without modifying the core components inside the drill collar (such as pulsers, etc.), significantly reducing the maintenance cost; 2. The upper and lower adjusting sleeves 1 can be replaced independently. The upper adjusting sleeve is easy to disassemble, and the lower adjusting sleeve 1 can be efficiently disassembled and assembled through a special tooling, solving the problem of difficult disassembly of the traditional lower adjusting sleeve 1 and adapting to the needs of different maintenance scenarios; according to the difference in drill collar diameter (D > 100 mm or D ≤ 100 mm), the lower adjusting sleeve 1 adopts a low-pitch thread 141 or a compensation groove design to cover the full-size requirements; 3. Using a professional tooling to disassemble the lower adjusting sleeve 1 greatly improves the drill collar maintenance efficiency; for the large-diameter adjusting sleeve, a threaded transmission tooling adopts mechanical structures such as a ball screw 121 + a thrust bearing 123, and the lower adjusting sleeve 1 is ejected by rotating transmission, avoiding component damage caused by violent disassembly; for the small-diameter adjusting sleeve, a pull-type tooling designs a rotatable pulling head 160 to engage with the compensation groove, and cooperates with a slider 172 to impact and loosen the bonded components, solving the problem of mud jamming and shortening the maintenance cycle; 4. The adjusting sleeve is produced in a standardized manner, with a cost much lower than that of the core components of the drill collar, reducing the investment in maintenance spare parts and the material cost; the disassembly efficiency is greatly improved, reducing the manual time-consuming, ensuring the continuity of oil drilling operations, indirectly increasing the production capacity, and shortening the maintenance period.

[0076] This specification describes examples of embodiments of the present invention and does not mean that these embodiments illustrate and describe all possible forms of the present invention. It should be understood that the embodiments in the specification can be implemented in various alternative forms. The drawings do not have to be drawn to scale; some features may be enlarged or reduced to show details of particular components. The specific structural and functional details disclosed should not be construed as limiting, but are merely a representative basis for teaching those skilled in the art to implement the present invention in multiple forms. Those skilled in the art should understand that the multiple features described and illustrated with reference to any one of the drawings can be combined with the features illustrated in one or more other drawings to form embodiments not explicitly illustrated or described. The combinations of features described provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention can be used for specific applications or implementations as needed.

[0077] The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adjustable compensation sleeve system for drill collar maintenance, characterized in that, Including: A split compensation component, which is composed of an upper adjusting sleeve and a lower adjusting sleeve that are detachably connected; The length of the upper adjusting sleeve satisfies the relational expression: L_up = L_original - (x + y) ± 0.5 mm; The length of the lower adjusting sleeve satisfies the relational expression: L_down = L_original + y ± 0.5 mm; where L_original is the original length reference value of the drill collar, x is the repair removal amount of the upper end face of the drill collar, and y is the repair removal amount of the lower end face of the drill collar.

2. The adjustable compensation sleeve system for drill collar maintenance according to claim 1, wherein The lower adjusting sleeve includes: When the diameter D > 100 mm, the inner wall is provided with low-pitch ACME threads with a pressure angle of 10° ± 0.5° and a lead angle ≤ 5°, and the thread depth h satisfies h = (0.3 - 0.4)T, where T is the wall thickness of the lower adjusting sleeve; When the diameter D ≤ 100 mm, at least one annular compensation groove is provided on the inner wall, and the depth d of the compensation groove satisfies d = (0.2 - 0.3)T, where T is the wall thickness of the lower adjusting sleeve.

3. The adjustable compensation sleeve system for drill collar maintenance according to claim 2, characterized in that, The compensation groove includes: A circumferentially continuous annular groove; or A circumferential array composed of 2N sector grooves, 2N ≥ 2 and the angular distance α between adjacent grooves ≤ 90°.

4. A method of using an adjustable compensating sleeve system for drill collar maintenance, including the adjustable compensating sleeve system according to any one of claims 1-3, characterized in that, Including the following steps: Measure the axial deviation amount ΔL of the repaired drill collar, ΔL = x + y; Determine the matching scheme of the upper adjusting sleeve and the lower adjusting sleeve according to the calculation model of the compensation component; Install the compensation component to the drill collar through a thermal expansion assembly process; Use a special tooling to separate the split compensation component, wherein, when D > 100 mm, a thread drive type disassembly tooling is adopted; when D ≤ 100 mm, a pulling type disassembly tooling is adopted.

5. The method of using the adjustable compensation sleeve system for drill collar maintenance according to claim 4, characterized in that, The thread drive type disassembly tooling includes: A thread male socket, a through hole is provided axially in the thread male socket, and an external thread matching the end face of the drill collar is provided on the outer wall, and the thread male socket is assembled to the male end of the drill collar; An ejection component, which is fixedly assembled on the thread male socket, and the movable part of the ejection component makes a rotational motion to a linear motion in the through hole; An extension rod, one end of which is detachably connected to the movable part of the ejection component, and the ejection component ejects the extension rod; A connecting sleeve, one end of which is detachably connected to the extension rod, and the outer wall near the end face is provided with low-pitch threads to connect to the lower adjusting sleeve of the drill collar; one or more straightening areas are provided on the outer wall of the connecting sleeve, and when the extension rod is ejected, the lower adjusting sleeve connected to the connecting sleeve and the drill collar are loosened.

6. The method of using the adjustable compensation sleeve system for drill collar maintenance according to claim 5, characterized in that The ejection component includes: A ball screw, the flange of the ball screw is detachably connected to the end face of the thread male socket, and the screw rod of the ball screw passes through the flange and is inserted into the through hole; A screw adapter, a threaded hole for the screw rod to pass through is provided axially in the screw adapter; A thrust bearing, the outer ring of the thrust bearing is fixedly connected to the inner wall of the through hole; A bearing rod, one end of which is a slender cylinder, passes through the inner ring of the thrust bearing and is connected to the screw adapter; the other end is a cylindrical groove body, and a first internal thread groove is provided axially inside to be detachably connected to the extension rod; when the screw rod rotates, the bearing rod is ejected.

7. The usage method of the adjustable compensation sleeve system for drill collar maintenance according to claim 4, characterized in that The pulling type disassembly tooling includes: Extension rod, the extension rod is a slender rod body, the first end of the extension rod is connected to a swivel joint, a mounting groove is arranged on the first end face of the swivel joint along the central axis direction, the length of the mounting groove is greater than or equal to the diameter of the swivel joint, the mounting groove divides the swivel joint into two symmetrical rotating seats, and a first rotating pin mounting hole is arranged on the rotating seat; Pulling head, the pulling head includes a connecting part and pulling parts arranged on both sides of the connecting part, a second rotating pin mounting hole is arranged on the connecting part, after the rotating pin is sequentially assembled in the first rotating pin mounting hole, the second rotating pin mounting hole and the first rotating pin mounting hole, the whole pulling head can rotate within a certain range based on the swivel joint.

8. The method of using the adjustable compensation sleeve system for drill collar maintenance according to claim 7, characterized in that, The thickness t of the pulling part and the depth d of the compensation groove satisfy t = (0.85 - 0.9)d.

9. The usage method of the adjustable compensation sleeve system for drill collar maintenance according to claim 8, characterized in that, The pulling tooling further includes: End head, assembled at the second end of the extension rod and detachably connected to the extension rod; Slider, sleeved on the extension rod and slidable on the extension rod.

10. The method of using the adjustable compensation sleeve system for drill collar maintenance according to claim 9, characterized in that, The using method of the pulling tooling is as follows: Assemble the pulling head on the swivel joint with a rotating pin, the extension rod is clamped with the swivel joint, hold the extension rod by hand and insert the pulling tooling into the inner hole of the adjusting sleeve until it contacts the groove of the lower adjusting sleeve; Rotate the extension rod clockwise to lock the pulling head in the groove of the adjusting sleeve, and then slowly apply force axially to pull the extension rod to pull out the lower adjusting sleeve; When there is sludge adhesion and jamming and the lower adjusting sleeve cannot be pulled out: Assemble the slider and the end head on the extension rod in sequence, slide the slider on the extension rod multiple times to impact the end head, loosen the lower adjusting sleeve, and pull the extension rod to disassemble the lower adjusting sleeve.

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