Oil well tubing string connection joint
A technology for connecting joints and oil well pipes, used in drill pipes, casings, drilling equipment, etc., can solve the problems of limited tensile and torsional performance of drill string connection, small contact area of thread teeth, serious stress concentration of thread teeth, etc. Improved stress extremes and stress distribution, improved torsional and tensile properties, and large contact area
Active Publication Date: 2019-06-14
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 tubing string connection joint. The oil well tubing string connection joint includes a male joint threaded section and a female joint threaded section; the male joint threaded section and the female joint threaded section are provided with threaded tooth crests, threaded tooth bearing surfaces, threaded tooth roots and threaded tooth guide surfaces, wherein thethreaded tooth crests, the threaded tooth bearing surfaces, the threaded tooth roots and the threaded tooth guide surfaces are alternately and continuously arranged in sequence along a threaded toothed bus bar; the threaded tooth crests, the threaded tooth bearing surfaces, the threaded tooth roots and the threaded tooth guide surfaces of the male joint and the female joint are connected in sequence and are tangent or in smooth transition; and the male joint threaded tooth bearing surface and the female joint threaded tooth bearing surface are S-shaped curved surface profile shapes composed oftwo tangent arcs, and the male joint threaded tooth guiding surface and the female joint threaded tooth guiding surface are in circular arc curved surface profile shapes. Compared with the prior art,after a joint is matched in a threaded mode, the contact area of threaded teeth is larger, the critical cross-section area of the joint is enlarged, the torsional and tensile properties are improved,and the stress extreme value and stress distribution of threaded connection are further effectively improved, and the drilling efficiency and safety can be greatly improved.
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