Anti-abrasion drill rod for special well

Abstract

The special well anti-abrasion drill rod comprises an anti-abrasion ring sleeve capable of being arranged on the drill rod in a sleeving mode, a plurality of guide grooves are formed in the outer wall of the anti-abrasion ring sleeve in the length direction of the anti-abrasion ring sleeve, the guide grooves are in an arc shape and spirally extend in the length direction of the anti-abrasion ring sleeve, and the anti-abrasion ring sleeve comprises a ring sleeve body and an anti-abrasion layer. And the wear-resistant layer wraps the periphery of the ring sleeve body. According to the anti-abrasion ring sleeve, mud or rock debris can be effectively guided to penetrate through the anti-abrasion ring sleeve through the guide groove, so that the pushing force of the anti-abrasion ring sleeve is reduced, the risk that the anti-abrasion ring sleeve falls off is reduced, the anti-abrasion layer is arranged, the anti-abrasion, high-temperature-resistant and corrosion-resistant effects of the anti-abrasion ring sleeve are greatly improved, and therefore the service life of the whole anti-abrasion ring sleeve is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of petroleum drilling engineering, and in particular to a special well wear-resistant drill pipe. Background Art

[0002] As global demand for oil resources continues to grow, oil drilling technology is undergoing unprecedented development. Within this process, drilling deep, ultra-deep, and extended-reach wells has become a key challenge within the industry. These drilling tasks require not only advanced technology and sophisticated equipment, but also the stability and safety of drilling tools in complex and changing drilling environments.

[0003] In these deep and complex drilling environments, prolonged contact and friction between the drill string and downhole casing has become a significant issue. The increasing depth and complexity of wellbore trajectories exacerbate friction between the drill pipe and casing. This friction not only exacerbates wear on the drill pipe, leading to premature damage to the drill pipe and its joints, but also increases torque on the drill pipe, making the drill string more susceptible to breakage during operation. Prolonged friction can also severely wear the casing surface, even causing perforations and loss of its original pressure-bearing capacity. This poses significant challenges and difficulties to subsequent drilling operations, and in severe cases, can even lead to the failure of the entire drilling mission.

[0004] To address this issue, the industry generally employs anti-wear devices that reduce friction between the drill pipe and downhole casing to protect them. However, existing anti-wear devices have exposed a series of problems during use. First, these anti-wear devices generally suffer from short service life, suboptimal torque reduction and anti-wear performance, complex structures, and high costs, which increase the cost and risk of drilling operations. Furthermore, when used in the presence of large amounts of rock cuttings or mud in the well, these anti-wear devices often have poor slag removal performance. The accumulation of rock cuttings and mud not only easily squeezes the anti-wear devices, causing them to loosen and fall off, thus losing their intended anti-wear effectiveness, but also, when excessive debris clogs the anti-wear devices, it can easily cause pipe sticking, seriously hindering the smooth progress of drilling operations. Furthermore, if multiple anti-wear devices loosen and fall off simultaneously, it can cause blockage in the mud outlet pipeline, posing greater risks and hidden dangers to drilling operations. Summary of the Invention

[0005] The present application provides a special well anti-wear drill pipe, aiming to solve the problems of short service life and poor slag removal effect of existing anti-wear devices.

[0006] The present application provides a special well wear-resistant drill pipe, comprising a drill pipe and an anti-wear ring sleeve that can be sleeved on the drill pipe, wherein the outer wall of the anti-wear ring sleeve is provided with a plurality of guide grooves along the length direction of the anti-wear ring sleeve, and the guide grooves are arranged in an arc shape, and the guide grooves extend spirally along the length direction of the anti-wear ring sleeve, and the anti-wear ring sleeve comprises a ring sleeve body and a wear-resistant layer, and the wear-resistant layer is wrapped around the outer periphery of the ring sleeve body.

[0007] Optionally, the anti-wear ring is divided into a first circular arc shell and a second circular arc shell that are detachable and separable, one side of the first circular arc shell and the second circular arc shell are hingedly connected by a hinge rod, and the other side of the first circular arc shell and the second circular arc shell are connected by multiple locking screws.

[0008] Optionally, the first arc shell and the second arc shell are arranged in a staggered tooth shape at the hinge rod, and the hinge rod is hinged and passes through each tooth portion of the first arc shell and the second arc shell.

[0009] Optionally, the openings at both ends of the anti-wear ring and the wear-resistant layer are both inclined.

[0010] Optionally, both end openings of the anti-wear ring sleeve are provided with extension rings, and a clamp is provided on the outside of the extension ring.

[0011] Optionally, the wear-resistant layer has a thickness of 3 mm to 5 mm.

[0012] Optionally, the ring sleeve body is made of high-wear-resistant resin.

[0013] Optionally, the wear-resistant layer is made of a high-wear-resistant resin embedded with diamond particles or a high-wear-resistant resin embedded with silicon carbide particles.

[0014] Beneficial effects:

[0015] The present application proposes a special well wear-resistant drill pipe, which has a simple structure and consists of only a few simple parts including an anti-wear ring sleeve, a hinged rod, a locking screw, an extension ring and a clamp. The overall weight is light, and the wear resistance, temperature resistance and corrosion resistance are greatly improved by providing a wear-resistant layer embedded with diamond particles. Installation and disassembly only require the operation of the locking screw and the clamp, which greatly reduces the maintenance and replacement steps.

[0016] During operation, the device can effectively guide mud or rock chips through the anti-wear ring sleeve by setting the guide groove, thereby reducing the force of the anti-wear ring sleeve being pushed and reducing the risk of the anti-wear ring sleeve falling off. By setting the wear-resistant layer, the wear resistance, high temperature resistance and corrosion resistance of the anti-wear ring sleeve are greatly increased, thereby increasing the overall service life of the anti-wear ring sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a schematic structural diagram of a special well anti-wear drill pipe according to an embodiment of the present application, in which an anti-wear ring is sleeved on the drill pipe;

[0019] Figure 2 This is a front cross-sectional view of an anti-wear collar for a special well anti-wear drill pipe according to one embodiment of the present application;

[0020] Figure 3 This is a partial cross-sectional view of a front view of an anti-wear collar for a special well anti-wear drill pipe according to one embodiment of the present application;

[0021] Figure 4 This is a top view of an anti-wear collar for a special well anti-wear drill pipe according to one embodiment of the present application;

[0022] Figure 5 This is a right side view of an anti-wear collar for a special well anti-wear drill pipe according to one embodiment of the present application;

[0023] Description of the reference numerals: anti-wear ring 100 , guide groove 101 , ring body 102 , wear-resistant layer 103 , hinge rod 200 , locking screw 201 , extension ring 300 , clamp 301 . DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] In the related art, there are various types of anti-wear sleeves, among which steel sleeve type, rubber type and rolling bearing type are several common designs, but they all have some shortcomings that cannot be ignored.

[0026] 1. Steel-Sleeved Wear Sleeves: Steel-sleeved wear sleeves are a type of protective device widely used in the oil drilling industry. Typically made of high-strength steel, they are designed to fit snugly around the outside of drill pipe or casing. During installation, they are secured to the drill pipe or casing using bolts, clamps, or other specialized fasteners to ensure stability. Once installed, they form a hard, protective layer that reduces direct contact and friction between the drill pipe and casing.

[0027] However, steel-sleeved wear sleeves, made of high-strength steel, are inherently heavy. This not only increases the load on the drill bit but can also increase energy consumption, reducing drilling efficiency. This disadvantage is particularly pronounced in deep-well drilling operations, which place higher demands on the performance and lifespan of drilling equipment.

[0028] While steel-sleeved wear sleeves offer high wear resistance, they wear out at an accelerated rate under prolonged, high-frequency friction. This is particularly true in harsh drilling environments, such as those subject to high wear rates or high impact forces. Severe wear requires frequent replacement, increasing operating costs and downtime.

[0029] Steel-sleeved wear sleeves have strict requirements for drill pipe and casing dimensions. If the dimensions of the drill pipe or casing change (due to wear, corrosion, etc.), the steel sleeve may not fit tightly, thus compromising its protective effectiveness. Furthermore, steel-sleeved wear sleeves are less adaptable to drilling fluids, which can corrode or abrade the steel sleeve.

[0030] The installation of steel-type wear sleeves requires specialized tools and techniques, making the installation process cumbersome. Furthermore, their heavy weight and size make replacement and maintenance difficult, increasing the workload and safety risks faced by operators.

[0031] In general, the steel sleeve type anti-wear sleeve has the disadvantages of being heavy, having limited wear resistance and poor adaptability.

[0032] 2. Rubber Wear Sleeves: Rubber wear sleeves are protective devices made of rubber or a rubber composite material. They are typically soft, wear-resistant, and corrosion-resistant, and can fit tightly onto the outside of drill pipe or casing. During installation, the rubber wear sleeve compresses or stretches to accommodate different drill pipe and casing sizes. Once installed, the rubber wear sleeve forms a soft protective layer, filling the tiny gaps between the drill pipe and casing, reducing friction and wear.

[0033] However, rubber materials are prone to aging, hardening, and even melting at high temperatures, losing their flexibility and wear resistance. Therefore, the use of rubber wear sleeves in high-temperature drilling environments is limited. Using rubber wear sleeves in high-temperature environments can lead to rapid failure, increasing replacement frequency and operating costs.

[0034] While rubber has a certain degree of wear resistance, prolonged, high-frequency friction can cause rubber sleeves to wear more rapidly. This is particularly true in harsh drilling environments, such as those with high sand content in mud. This can lead to reduced protection and even premature failure.

[0035] Rubber materials are sensitive to certain chemicals. If the drilling fluid contains these chemicals, it may accelerate the aging or damage of the rubber wear sleeve. This increases the difficulty of selecting rubber wear sleeves and the frequency of replacement, while also increasing operating costs and risks.

[0036] Rubber is relatively fragile and susceptible to mechanical damage or tearing. During drilling, if the rubber wear sleeve is impacted or squeezed, it may be damaged or fail, increasing operational risks and safety hazards.

[0037] In general, rubber wear sleeves have the disadvantages of poor temperature resistance, limited wear resistance and sensitivity to chemical substances.

[0038] 3. Rolling bearing wear sleeves: Rolling bearing wear sleeves reduce friction and wear by placing rolling bearings between the drill pipe and casing. Typically installed on the drill pipe joint, they reduce wear and torque by replacing sliding friction with rolling friction. While their structure is relatively complex, requiring precise machining and installation, once installed, they significantly reduce friction and wear between the drill pipe and casing.

[0039] However, rolling bearing wear sleeves are relatively complex in structure and require precise machining and installation. This not only increases manufacturing cost and difficulty but can also lead to errors or problems during installation. Furthermore, maintenance of rolling bearing wear sleeves is complex and requires specialized skills and tools.

[0040] Rolling bearing wear sleeves have strict requirements for the size, shape, and material of drill pipe and casing. Any changes in the size, shape, or material of the drill pipe or casing (such as wear or corrosion) can cause the rolling bearing to malfunction or even fail. This increases the difficulty in selecting rolling bearing wear sleeves and the risks involved in their use.

[0041] Rolling bearings require regular inspection and maintenance to ensure proper operation. This can be a difficult task in a drilling environment, as drilling operations often operate under high pressure, high temperature, and harsh conditions. Furthermore, rolling bearing maintenance requires specialized skills and tools, which increases both cost and difficulty.

[0042] Due to the complex structure and high manufacturing precision of rolling bearing wear sleeves, their cost is usually high. This increases operating costs and investment pressure, and may not be suitable for some small or low-cost drilling projects.

[0043] In general, rolling bearing anti-wear sleeves have the disadvantages of complex structure, difficult maintenance and limited adaptability.

[0044] In view of this, the embodiment of the present application proposes a special well anti-wear drill rod with an anti-wear structure, the anti-wear structure of which is light in weight, simple in structure, highly wear-resistant, heat-resistant and corrosion-resistant, and easy to install and maintain. The special well anti-wear drill rod can well improve the shortcomings of existing anti-wear devices.

[0045] Example

[0046] like Figures 1 to 5 As shown, the present application provides a special well wear-resistant drill pipe, which can be used as a sand-cleaning drill pipe to clean accumulated rock cuttings during horizontal well drilling. The drill pipe comprises a drill pipe and an anti-wear collar 100 that can be sleeved on the drill pipe. The anti-wear collar 100 is fixedly sleeved on the drill pipe during use. According to the drilling conditions, a plurality of anti-wear collars 100 can be sleeved on a section of drill pipe, and the anti-wear collars 100 are sleeved on the drill pipe at equal intervals according to the preset number. When the anti-wear collar 100 is sleeved on the drill pipe, it can isolate the direct contact between the drill pipe and the casing. As the drill pipe advances, the anti-wear collar 100 sleeved on the drill pipe will also move accordingly. In this way, the anti-wear collar 100 will not rub against a certain part of the casing, causing damage to the casing, thereby achieving an anti-wear effect.

[0047] The outer wall of the anti-wear ring sleeve 100 is provided with a plurality of guide grooves 101 along the length direction of the anti-wear ring sleeve 100. The guide grooves 101 are provided on the outer wall of the anti-wear ring sleeve 100 and pass through both ends of the anti-wear ring sleeve 100 in the length direction of the anti-wear ring sleeve 100. When the anti-wear ring sleeve 100 moves with the drill pipe, rock cuttings and mud can move from one side of the anti-wear ring sleeve 100 to the other side along the guide grooves 101, thereby preventing the anti-wear ring sleeve 100 from being squeezed by the stationary rock cuttings and mud when the anti-wear ring sleeve 100 moves, causing the anti-wear ring sleeve 100 to loosen and fall off from the drill pipe.

[0048] Specifically, the guide groove 101 is arc-shaped, and the groove wall of the guide groove 101 is smoothly set, so that when rock cuttings and mud enter the guide groove 101, they will not get stuck therein, causing blockage. At the same time, the guide groove 101 extends spirally along the length direction of the anti-wear ring 100, and when the anti-wear ring 100 moves with the drill pipe, it will also rotate with the drill pipe, and the spirally set guide groove 101 can push the rock cuttings and mud into the guide groove 101, further preventing rock cuttings and mud from being blocked.

[0049] Because in the anti-wear use of the anti-wear ring 100, the outer diameter of the anti-wear ring 100 will be reduced when it is worn and consumed, that is, the outermost part of the anti-wear ring 100 will be worn away, and the drill pipe may not be completely straight in the well. When the anti-wear ring 100 is worn to a certain extent (the outer diameter is reduced to a certain extent), part of the drill pipe may contact the casing, losing or reducing the anti-wear effect. Therefore, in the anti-wear use of the anti-wear ring 100, it is mainly the outer layer of the anti-wear ring 100 that is worn and consumed to achieve anti-wear. When the outer layer of the ring sleeve 100 is worn and consumed, the service life of the anti-wear ring sleeve 100 is over. Therefore, the anti-wear ring sleeve 100 is divided into two parts: a ring sleeve body 102 and a wear-resistant layer 103, and the wear-resistant layer 103 is wrapped around the outer periphery of the ring sleeve body 102. The wear-resistant layer 103 is made of a high-hardness wear-resistant material, which increases the wear resistance of the anti-wear ring sleeve 100, thereby increasing its service life. The material of the ring sleeve body 102 is other materials that will not be deformed or damaged during use, which controls the manufacturing cost and does not make the cost of the anti-wear ring sleeve 100 too high.

[0050] like Figures 3 to 5 As shown, further, in order to facilitate the installation of the anti-wear ring 100 on the drill pipe, the anti-wear ring 100 is divided into a first arc shell and a second arc shell that can be detached and separated. During installation, the first arc shell and the second arc shell can be disassembled and then sleeved on the drill pipe and then closed;

[0051] Specifically, one side of the first arc shell and the second arc shell are hingedly connected by a hinge rod 200, so that the first arc shell and the second arc shell can rotate around the hinge rod 200, and the first arc shell and the second arc shell are connected together by the hinge rod 200 and will not be completely separated. At the same time, the first arc shell and the second arc shell can rotate relative to each other, so that the internal space of the anti-wear ring 100 can be opened by rotating the first arc shell and the second arc shell. After the internal space of the anti-wear ring 100 is opened, the anti-wear ring 100 can be placed on the drill pipe, and then the first arc shell is rotated. The first and second arc shells make the anti-wear ring sleeve 100 closed. In order to ensure the stability of the anti-wear ring sleeve 100 when the anti-wear ring sleeve 100 is closed, a plurality of threaded holes are jointly opened on the other side of the first and second arc shells, and matching locking screws 201 are provided in the threaded holes. In this way, when the anti-wear ring sleeve 100 is closed, the locking screws 201 are placed in the threaded holes to fix the first and second arc shells, thereby fixing the entire anti-wear ring sleeve 100. When the anti-wear ring sleeve 100 needs to be removed, the locking screws 201 are removed to rotate the first and second arc shells.

[0052] like Figure 4As shown, further, in order to make the space occupied by the rotation of the first arc shell and the second arc shell smaller, thereby maintaining the integrity of the circle formed by the anti-wear ring 100, the first arc shell and the second arc shell are arranged in a mutually staggered tooth shape at the hinge rod 200, so that the first arc shell and the second arc shell can overlap with each other at their respective tooth structures, and then the hinge rod 200 is hinged to penetrate the various tooth parts of the first arc shell and the second arc shell, thereby realizing the mutual hinge connection of the first arc shell and the second arc shell.

[0053] Furthermore, the openings at both ends of the anti-wear ring 100 and the wear-resistant layer 103 are tilted, so that an inclined arc surface can be formed, making it easier for rock chips and mud to enter the guide groove 101, thereby facilitating inspection when the anti-wear ring 100 is moved.

[0054] like Figures 3 to 5 As shown, further, in order to strengthen the grip of the anti-wear ring 100 on the drill pipe, extension rings 300 are provided at both end openings of the anti-wear ring 100, and a clamp 301 is provided on the outside of the extension ring 300. The extension ring 300 is made of elastic material, and the clamp 301 can be tightened and squeezed to squeeze the extension ring 300 so that the extension ring 300 is gripped on the drill pipe, further strengthening the fixation of the anti-wear ring 100 on the drill pipe, reducing the probability of the anti-wear ring 100 loosening when being squeezed, and increasing the ability of the anti-wear ring 100 to withstand squeezing.

[0055] Furthermore, the thickness of the wear-resistant layer 103 is 3 mm to 5 mm, which increases the service life of the anti-wear ring 100 without increasing the manufacturing cost too much.

[0056] like Figure 2 As shown, further, the material of the ring sleeve body 102 is a highly wear-resistant resin, so that after the wear-resistant layer 103 is worn and consumed, the ring sleeve body 102 can still play a role of wear resistance and abrasion prevention, preventing the ring sleeve body 102 from being quickly consumed, thereby preventing the anti-wear ring 100 from being quickly worn and consumed after the wear-resistant layer 103 is worn and consumed, so that the anti-wear ring 100 completely loses its anti-wear effect, and different drilling conditions are different, and the wear speed is different. The anti-wear ring 100 with the wear-resistant layer 103 worn out may not be replaced in time, and the ring sleeve body 102 of the highly wear-resistant resin can give a certain reaction time for replacing the anti-wear ring 100.

[0057] Furthermore, the material of the wear-resistant layer 103 is a high-wear-resistant resin embedded with diamond particles or a high-wear-resistant resin embedded with silicon carbide particles. Adding embedded diamond particles can greatly increase the wear resistance of the wear-resistant layer 103. At the same time, it will not accelerate aging in harsh environments such as high temperature and corrosion, thereby increasing the overall service life of the anti-wear ring 100.

[0058] By providing the guide groove 101, mud or rock chips can be effectively guided to pass through the anti-wear ring 100, thereby reducing the force of the anti-wear ring 100 being pushed and reducing the risk of the anti-wear ring 100 falling off. By providing the wear-resistant layer 103, the wear resistance, high temperature resistance and corrosion resistance of the anti-wear ring 100 are greatly increased, thereby increasing the overall service life of the anti-wear ring 100.

[0059] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0060] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or terminal device that includes the element.

[0061] The technical solutions provided by this application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of this application. The description of the above embodiments is only intended to help understand this application, and the contents of this specification should not be construed as limiting this application. At the same time, for those skilled in the art, according to this application, there may be various changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all implementation methods here, and obvious changes or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A special well wear-resistant drill pipe, comprising a drill pipe and an anti-wear collar that can be sleeved on the drill pipe, characterized in that: The outer wall of the anti-wear ring sleeve is provided with a plurality of guide grooves along the length direction of the anti-wear ring sleeve, and the guide grooves are arranged in an arc shape, the guide groove walls are arranged smoothly, and the guide grooves extend spirally along the length direction of the anti-wear ring sleeve. The anti-wear ring sleeve includes a ring sleeve body and a wear-resistant layer, and the wear-resistant layer is wrapped around the outer periphery of the ring sleeve body; the openings at both ends of the anti-wear ring sleeve and the wear-resistant layer are arranged obliquely.

2. The wear-resistant drill pipe for special wells according to claim 1, characterized in that: The anti-wear ring is divided into a detachable first arc shell and a second arc shell. One side of the first arc shell and the second arc shell are hingedly connected by a hinge rod, and the other side of the first arc shell and the second arc shell are connected by multiple locking screws.

3. The wear-resistant drill pipe for special wells according to claim 2, characterized in that: The first arc shell and the second arc shell are arranged in a mutually staggered tooth shape at the hinge rod, and the hinge rod is hinged and passes through each tooth-shaped portion of the first arc shell and the second arc shell.

4. The wear-resistant drill pipe for special wells according to claim 1, characterized in that: The openings at both ends of the anti-wear ring sleeve are both provided with extension rings, and a clamp is provided on the outside of the extension ring.

5. The wear-resistant drill pipe for special wells according to claim 1, characterized in that: The wear-resistant layer has a thickness of 3 mm to 5 mm.

6. The wear-resistant drill pipe for special wells according to claim 1, characterized in that: The material of the ring sleeve body is high wear-resistant resin.

7. The wear-resistant drill pipe for special wells according to claim 1, characterized in that: The material of the wear-resistant layer is a high-wear-resistant resin embedded with diamond particles or a high-wear-resistant resin embedded with silicon carbide particles.

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