Variable-taper thread structure for drilling tool
A technology of variable taper and thread, applied in drill pipe, drill pipe, earthwork drilling and other directions, can solve the problems of easy bumping, unguaranteed torque, and inconvenience for well team operators to work on site, so as to improve operation efficiency, The effect of improving the sealing performance and improving the fatigue performance of the thread
Pending Publication Date: 2022-07-29
DONGYING WEIMA PETROLEUM DRILLING TOOLS
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Problems solved by technology
However, most of the threads only solve a single problem. For example, some double shoulder threads can increase the torque and reduce the outer diameter of the joint, but the buckle is easy to be damaged; some threads can increase the inner diameter of the joint, but the torque is not necessary. to guarantee
Especially for some large-scale drilling tool threads (outer diameter of the pipe is more than 139.7mm), it is necessary to improve the torque, bending moment and fatigue performance while not reducing the connection strength of the thread, and it is not possible to use too complicated multiple parts. Threaded connection, not convenient for well crew operators to work on site
Method used
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Embodiment 1
[0023] In this example, a drill pipe with an outer diameter of 139.7 mm is used as an example, such as figure 1 and 2 As shown, the outer diameter D1 of the male joint and the outer diameter D2 of the female joint are 184.2-203.2 mm, and the inner diameter d1 of the male joint and the inner diameter d2 of the female joint are 88.9-101.6 mm.
[0024] The variable taper thread structure for a drilling tool in this embodiment includes a male joint thread provided on the male joint and a female joint thread provided on the female joint; the male joint thread includes the male joint sub-shoulder sealing surfaces arranged in sequence 5. The front thread of the male joint 1, the middle cylinder of the male joint 2, the rear thread of the male joint 3, and the main shoulder sealing surface 4 of the male joint; The front thread 6, the middle cylinder 7 of the female joint, the rear thread 8 of the female joint and the sealing surface 9 of the main shoulder of the female joint; is 1:6...
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The invention relates to the technical field of machining, in particular to a variable-taper thread structure for a drilling tool, which comprises a male joint thread arranged on a male joint and a female joint thread arranged on a female joint, the male joint thread comprises a male joint auxiliary circular bead sealing surface, a male joint front section thread, a male joint middle cylinder, a male joint rear section thread and a male joint main circular bead sealing surface which are arranged in sequence; the female joint thread comprises a female joint auxiliary circular bead sealing surface, a female joint front section thread, a female joint middle cylinder, a female joint rear section thread and a female joint main circular bead sealing surface which are arranged in sequence; the male connector front section thread is meshed with the female connector front section thread, and the male connector rear section thread is meshed with the female connector rear section thread. The variable-taper double-section thread structure is adopted, the sealing performance of the threads can be improved, the variable-taper double-section thread structure is particularly suitable for operation of a large-specification drilling tool in high-pressure drilling, stratum fracturing and other complex environments, and the tripping phenomenon can be effectively prevented when the torque of the threads is insufficient.
Description
technical field [0001] The invention relates to the technical field of machining, in particular to a variable taper thread structure for a drilling tool. Background technique [0002] In the process of oil and gas drilling operations, the drilling tools are usually connected between single rods through the rotary shoulder threaded connection structure, so as to realize power transmission and ensure the smooth completion of the drilling process. At present, the size of the threaded connection structure of the drilling tool is mainly processed according to the standard API Spec7-2. Drilling tools are subjected to complex tensile, torque, bending moment and vibration loads during service, and failure accidents such as puncture, fracture and bonding are very easy to occur at the threaded connection. In recent years, with the exploration and development of deep oil and gas resources and the promotion and application of enhanced drilling technology, the service conditions of dril...
Claims
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IPC IPC(8): E21B17/042
CPCE21B17/042
Inventor 张献才纪淑妍吴新伟张海洋宋丽明
Owner DONGYING WEIMA PETROLEUM DRILLING TOOLS