An oil well pipe string connection joint
A technology for connecting joints and oil well pipes, applied in the direction of drill pipes, casings, drilling equipment, etc., can solve the problems of limited tensile and torsional performance of drill string connections, small contact area of thread teeth, serious stress concentration of thread teeth, etc., to achieve Improved stress extremes and stress distribution, improved torsional and tensile properties
Active Publication Date: 2022-02-18
上海海隆石油钻具有限公司 +1
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Problems solved by technology
After the make-up connection of this thread profile structure, the contact area of the thread flank is small, and the stress concentration of the thread tooth is serious, which leads to certain restrictions on the tensile and torsional performance of the drill string connection.
Especially for oil and gas production such as ultra-deep wells, extended-reach wells and offshore oil and gas wells with high drilling costs, it is difficult to provide effective torque requirements. Hidden danger
Method used
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Embodiment 1
[0033] see Figure 1-Figure 2 , an oil well string connecting joint, the connecting joint includes a male joint threaded section 1 and a female joint threaded section 2; Bearing surface 12, thread bottom 13 and thread guide surface 14; said female joint thread section 2 has thread crest 21, thread tooth bearing surface 22, thread bottom 23 and thread tooth which are alternately and continuously arranged along thread generatrix 4 The guide surface 24; the thread crest 11 of the male joint, the thread bearing surface 12, the thread bottom 13 and the thread guide surface 14 are sequentially connected in tangent or smooth transition; the female joint thread crest 21, thread tooth The bearing surface 22, the thread bottom 23 and the thread guide surface 24 are all connected in tangential or smooth transition; the bearing surface 12 of the male joint thread and the bearing surface 22 of the female joint thread are composed of two tangent arcs S-shaped surface profile shape, the fir...
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The invention discloses an oil well pipe string connecting joint, which comprises a male joint thread section and a female joint thread section; the male joint and the female joint thread section have thread crests, thread tooth bearing surfaces, and thread tooth bottoms arranged alternately and continuously along the thread generatrix and the thread guide surface; the thread crest, thread bearing surface, thread bottom and thread guide surface of the male and female joints are connected in sequence, all of which are tangent or smooth transition; the thread bearing surface of the male joint and the thread bearing surface of the female joint Both are S-shaped curved surface contours formed by two tangent arcs, and the threaded thread guide surface of the male joint and the threaded thread guide surface of the female joint are arc-shaped curved surface contours. Compared with the existing technology, after the joint is threaded, the contact area of the thread teeth is larger, the critical cross-sectional area of the joint is larger, the torsional performance and tensile performance are improved, and the stress extreme value and stress distribution of the threaded connection are effectively improved It can greatly improve drilling efficiency and safety.
Description
technical field [0001] The invention relates to an oil well pipe string tool used in the oil and gas exploration and development process, in particular to an oil well pipe string connection joint suitable for oil and natural gas exploitation such as ultra-deep wells, extended-reach wells, and offshore oil and gas wells. Background technique [0002] The oil well string tools mentioned in this article include oil casing, tubing and drill string components (kelly, drill pipe, thick-walled drill pipe, drill collar, adapter and other drilling tools). [0003] The oil and gas drilling industry has been breaking through the existing drilling limits, and the number and depth records of ultra-deep wells, extended-reach extension wells and offshore oil and gas wells have been continuously refreshed. The breakthrough of the drilling limit needs to face the problems of harsh drilling conditions, complex stress on the drill string in service, and low drilling efficiency. The threaded co...
Claims
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IPC IPC(8): E21B17/042
Inventor 舒志强欧阳志英余世杰鲁喜宁
Owner 上海海隆石油钻具有限公司