Anti-jamming double-wall drill rod and drilling tool
By incorporating wear-resistant blocks and conical groove structures on the drill pipe joint, the problem of stuck drill pipes in complex formations was solved, resulting in higher drilling efficiency and safety.
Patent Information
- Application Number
- CN202520247727.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-17
AI Technical Summary
Existing double-walled drill pipes are prone to stuck pipe accidents in complex formations, especially in hard substructures, shale expansion, salt creep, or poor wellbore cleaning. Traditional designs fail to fully consider formation characteristics, drilling fluid properties, and operating procedures, resulting in a high risk of stuck pipe.
Male and female connectors are installed at both ends of the drill pipe body. Wear-resistant blocks are evenly distributed on the connectors, and conical grooves are machined on the transition cone surface. Hard alloy wear-resistant blocks are embedded and a wear-resistant coating is sprayed on. A wear-resistant protective structure is formed by friction welding to improve the wear resistance and corrosion resistance of the connector.
It effectively reduces the incidence of stuck pipe accidents during drilling, improves drilling production efficiency, and is suitable for more complex formations.
Smart Images
Figure CN223739341U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of drill pipe, especially a kind of anti-sticking double-wall drill pipe and drilling tool. BACKGROUND
[0002] Double-wall drill pipe is also called double-layer drill pipe, which is composed of inner and outer drill pipes (referred to as inner tube and outer tube). The annulus between the inner and outer tubes is a channel for pumping flushing medium to the bottom of the hole during hydraulic rock-conveying drilling and center sampling drilling. The inner tube center hole is fixed as a whole to discharge flushing medium, and each double-wall drill pipe is connected by the thread of the outer tube to ensure torque and pressure transmission.
[0003] Double-wall drill pipe is beneficial for drilling through complex strata. The circulation of compressed air in the double-wall drill pipe is like a closed-loop system. Even if it encounters an old crack or a cave, normal circulation will be restored immediately once the drilling tool reaches the bottom of the cave, which cannot be achieved in conventional drilling methods. In addition, double-wall drill pipe is a full-hole drilling tool with small hole wall gap, so there is no space for broken rock blocks to collapse, and double-wall drill pipe has a certain supporting effect on the hole wall. The continuity of the drilling process avoids the damage to the borehole caused by pressure fluctuations and suction due to frequent tripping of the drilling tool. The following means are generally used in the prior art to solve the above problems:
[0004] (1) Optimize drilling parameters, adjust drilling pressure and rotation speed according to stratum conditions to avoid bending or sticking of drill pipe due to high drilling pressure, reduce drilling speed in complex strata, and reduce the risk of sticking.
[0005] (2) Optimize mud performance, select appropriate mud density according to stratum pressure to ensure wellbore stability; control viscosity to avoid excessive mud viscosity and increase friction; add lubricant to reduce friction between drill pipe and wellbore; regularly clean rock debris in mud to prevent rock debris deposition from causing sticking.
[0006] (3) Select appropriate drill bit and drill tool combination according to stratum.
[0007] Traditional double-wall drill pipe is prone to sticking problems when encountering hard bottom layer, mud shale swelling, salt rock creep, or poor hole cleaning. The root cause of these problems is that the design of the drill pipe does not fully consider various adverse factors in the actual drilling environment, such as stratum characteristics, drilling fluid performance, drill tool structure, and operation process. In addition, the complexity of long horizontal section hole trajectory further increases the risk of double-wall drill pipe sticking, especially during azimuth adjustment.
[0008] Therefore, it is crucial to provide an anti-sticking double-wall drill pipe structure that aims to reduce the incidence of sticking accidents during drilling and improve production efficiency. SUMMARY
[0009] The utility model provides a kind of anti-stuck double-wall drill rod and drilling tool for the problems in prior art.
[0010] Among them, an anti-stuck double-wall drill rod, comprising:
[0011] Drill rod body, male joint and female joint for achieving connection are arranged at both ends of the drill rod body, wherein external threads are arranged on the male joint, and the female joint has internal threads matched with the external threads;
[0012] A plurality of first wear-resistant blocks for protecting the male joint from wear are uniformly arranged on the male joint in the circumferential direction, and a plurality of second wear-resistant blocks for protecting the female joint from wear are uniformly arranged on the female joint in the circumferential direction.
[0013] On the basis of the above-mentioned scheme, the male joint comprises a male joint body, a first tapered surface step arranged at one end of the male joint body for preliminary positioning and sealing when connected with the drill rod body, and a plurality of first tapered surface grooves arranged uniformly on the outer surface of the first tapered surface step in the circumferential direction for mounting the first wear-resistant blocks.
[0014] On the basis of the above-mentioned scheme, the female joint comprises a female joint body, a second tapered surface step arranged at one end of the female joint body for preliminary positioning and sealing when connected with the drill rod body, and a plurality of second tapered surface grooves arranged uniformly on the outer surface of the second tapered surface step in the circumferential direction for mounting the second wear-resistant blocks.
[0015] On the basis of the above-mentioned scheme, the included angles between the first tapered surface grooves and the second tapered surface grooves and the axial direction of the drill rod body are both 30°-60°.
[0016] On the basis of the above-mentioned scheme, the tapers of the first tapered surface step on the male joint and the second tapered surface step on the female joint are both 18°-35°.
[0017] On the basis of the above-mentioned scheme, the depths of the first tapered surface grooves and the second tapered surface grooves are both 2-4 mm.
[0018] On the basis of the above-mentioned scheme, the number of the first wear-resistant blocks and the second wear-resistant blocks is 6-12.
[0019] On the basis of the above-mentioned scheme, the length, width and thickness of the first wear-resistant blocks and the second wear-resistant blocks are 13-25.4 mm, 4-8 mm and 5-8 mm, respectively.
[0020] On the basis of the above-mentioned scheme, the surfaces of the first wear-resistant blocks and the second wear-resistant blocks are sprayed with wear-resistant and corrosion-resistant coating.
[0021] In addition, the utility model also provides a kind of drilling tool, including drill, drill collar, centralizer, further include the anti-sticking double-wall drill rod of the utility model.
[0022] Compared with prior art, the utility model double-wall drill rod rod body two ends adopt the mode of friction welding male joint and female joint with internal and external threads, the outer diameter of male joint and female joint is greater than drill rod rod body, a certain depth of taper groove is processed on the transition taper surface of male joint and female joint to drill rod rod body, the taper groove is uniformly distributed on the joint taper surface step as a whole, and a certain angle is formed with drill rod axial direction. Embed wear-resistant block of hard alloy material into taper groove and weld reinforcement, and spray wear-resistant coating on friction surface, improve wear resistance and corrosion resistance of wear-resistant block. The utility model can effectively reduce the occurrence rate of sticking accidents in drilling process, and improve production efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is the structure diagram of the anti-sticking double-wall drill rod of the utility model;
[0024] Figure 2 It is the structure diagram (showing front view) of the anti-sticking double-wall drill rod of the utility model;
[0025] Figure 3 It is the structure diagram of the first wear-resistant block of the utility model. Figure 2 It is the sectional view of A-A section of
[0026] Figure 4 It is the structure diagram of the first wear-resistant block of the utility model. DETAILED DESCRIPTION
[0027] The utility model will be further described in detail in combination with the drawings and examples, and it should be pointed out that the following examples are intended to facilitate the understanding of the utility model, and do not have any limiting effect on it.
[0028] Example 1
[0029] As shown in Figure 1 The utility model provides a kind of anti-sticking double-wall drill rod, including drill rod rod body 1, the male joint 2 for realizing connection and the female joint 3 for being used to cooperate with male joint 2 for being set in the both ends of the drill rod rod body 1. Wherein, the outer thread is set on the male joint 2, the female joint 3 has internal thread for being used in cooperation with outer thread, male joint 2 has outer thread, can be closely matched with the internal thread of female joint 3, so that one drill rod is connected with another drill rod, so that drill rod can form enough length, meet the needs of different drilling depth.
[0030] As shown in Figures 2-3As shown, specifically, the male joint 2 comprises a male joint body 2-1, a first tapered step 2-2 arranged at one end of the male joint body 2-1 for preliminary positioning and sealing when connected with the drill pipe body 1, first tapered grooves 2-3 arranged uniformly in the circumferential direction on the outer surface of the first tapered step 2-2 for mounting first wear-resistant blocks 2-5, a first weld neck 2-4 arranged at the connecting part of the first tapered step 2-2 and the drill pipe body 1, and first wear-resistant blocks 2-5 arranged uniformly in the circumferential direction outside the first tapered step 2-2 for protecting the male joint 2 from wear.
[0031] The female joint 3 comprises a female joint body 3-1, a second tapered step 3-2 arranged at one end of the female joint body 3-1 for preliminary positioning and sealing when connected with the drill pipe body 1, second tapered grooves 3-3 arranged uniformly in the circumferential direction on the outer surface of the second tapered step 3-2 for mounting second wear-resistant blocks 3-5, a second weld neck 3-4 arranged at the connecting part of the second tapered step 3-2 and the drill pipe body 1, and second wear-resistant blocks 3-5 arranged uniformly in the circumferential direction outside the second tapered step 3-2 for protecting the female joint 3 from wear.
[0032] The circumferentially distributed first wear-resistant blocks 2-5 form a wear-resistant band of the male joint 2, and the circumferentially distributed second wear-resistant blocks 3-5 form a wear-resistant band of the female joint 3.
[0033] As a specific embodiment, the taper of the first tapered step 2-2 of the male joint 2 is 18°-35°. This angle ensures smooth transition of the drill pipe body and the joint outer diameter size, and to a certain extent reduces stress concentration during drilling. In actual processing, a proper transition taper is selected according to the outer diameter size of the drill pipe.
[0034] As a specific embodiment, the depth of the first tapered groove 2-3 and the second tapered groove 3-3 is 2-4 mm.
[0035] As a specific embodiment, the axial angle between the first tapered groove 2-3 and the second tapered groove 3-3 and the drill pipe body 1 is 30°-60°. This design makes the first wear-resistant blocks 2-5 embedded in the first tapered groove 2-3 and the second wear-resistant blocks 3-5 embedded in the second tapered groove 3-3 circumferentially distributed at a certain angle with the drill pipe body 1, which can reduce collision and friction during drilling of the drill pipe and reduce the incidence of pipe sticking accidents.
[0036] As a specific embodiment, the number of the first wear-resistant blocks 2-5 and the second wear-resistant blocks 3-5 is 6-12. In use, the size and number of wear-resistant blocks can be selected according to the applicability of the outer diameter size of the drill pipe.
[0037] As shown in the drawings, the male joint 2 and the female joint 3 are connected with the drill pipe body 1 through the first weld neck 2-4 and the second weld neck 3-4. Figure 4As shown, as a specific embodiment, the first wear-resistant block 2-5 and the second wear-resistant block 3-5 are rectangular blocks with a length of 13-25.4 mm, a width of 4-8 mm, and a thickness of 5-8 mm, and the surfaces are sprayed with special wear-resistant and corrosion-resistant coatings. The shapes of the first wear-resistant block 2-5 and the second wear-resistant block 3-5 can also be other shapes, and the appropriate size wear-resistant block is selected according to the size of the drill pipe, which can protect the transition bevel of the drill pipe joint and does not affect the annular space between the drill pipe joint and the well wall, thereby ensuring the drilling efficiency.
[0038] The utility model provides a kind of anti-sticking double-wall drill pipe, the both ends of double-wall drill pipe body are welded with male joint 2 and female joint 3 with internal and external threads using friction welding mode, the outer diameter of male joint 2 and female joint 3 is greater than drill pipe body 1, a certain depth of taper groove is processed on the transition taper surface of male joint 2 and female joint 3 to drill pipe body 1, and the taper groove is uniformly distributed on the joint taper surface step in whole circumferentially, and forms a certain angle with drill pipe axial direction.
[0039] The above structure can reduce the sticking accident rate of double-wall drill pipe during drilling, reduce the sticking risk, improve the drilling efficiency, and make the drill pipe applicable to more complex formations.
[0040] Example 2
[0041] This embodiment provides a specific embodiment of a drilling tool according to the anti-sticking double-wall drill pipe in Example 1, which includes a drill bit, a drill collar, a centralizer, and the anti-sticking double-wall drill pipe in Example 1.
[0042] The above drilling tool is used for drilling equipment and further includes a power system, a lifting system, a rotating system, a circulating system, and other parts.
[0043] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above, it is not intended to limit the utility model. Any person skilled in the art can make some changes or modifications to the above-mentioned equivalent embodiments without departing from the technical solution of the utility model. Any modification, equivalent change, and modification of the above embodiment, which does not depart from the technical solution of the utility model, are still within the scope of the utility model.
Claims
1. A drag-reducing double-wall drill pipe, characterized by, The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe.
2. The anti-stuck double-wall drill pipe of claim 1, wherein, The application relates to a double-wall drill pipe.
3. The anti-stuck double-wall drill pipe of claim 2, wherein, The application relates to a double-wall drill pipe.
4. The anti-stuck double-wall drill pipe of claim 3, wherein, The application relates to a double-wall drill pipe.
5. The anti-stuck double-wall drill pipe of claim 3, wherein, The application relates to a double-wall drill pipe.
6. The anti-stuck double-wall drill pipe of claim 3, wherein, The application relates to a double-wall drill pipe.
7. The anti-stuck double-wall drill pipe of claim 1, wherein, The application relates to a double-wall drill pipe.
8. The anti-stuck double-wall drill pipe of claim 1, wherein, The application relates to a double-wall drill pipe.
9. The anti-stuck double-wall drill pipe of claim 1, wherein, The application relates to a double-wall drill pipe.
10. A drilling tool comprising a drill bit, a drill collar, a centralizer, characterized in that, The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. The application relates to a double-wall drill pipe. 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