Sawtooth thread of drill pipe joint
A drill pipe joint and external thread technology, applied in drill pipe, drill pipe, drilling equipment, etc., can solve problems such as shortening thread life, and achieve the effect of improving fatigue resistance, increasing tensile force and thrust force, and prolonging service life.
Active Publication Date: 2009-11-04
BEIJING CHINA COAL MINE ENG CO LTD
View PDF0 Cites 14 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
This thread works satisfactorily in the case of slender size drill strings, but problems arise as the drill string size increases, resulting in reduced thread life
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0020] figure 1 Shows the profile longitudinal section of the drill pipe joint zigzag internal thread 1, omits the rest of the drill pipe and only shows the threaded part, the pitch of which is d=15.63mm, the taper is 1:8, and the internal thread The tooth profile is not isosceles trapezoidal cross-section structure, the roughness of the internal thread is Ra=1.6, and the two ends of the first and second flanks are respectively chamfered, and the width of the crest of the internal thread is C 1 = 4.509 mm. The root of the internal thread has the first flank angle of the internal thread α=45° and the second flank angle of the internal thread β=15°, the first flank angle of the internal thread is the front flank angle, and the second flank angle of the internal thread is the posterior flank angle.
[0021] figure 2 shows the same figure 1 Corresponding tooth form longitudinal section view of drill pipe joint zigzag external thread 2, only shows its threaded part, correspond...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a drill pipe joint suitable for large-diameter raising-boring operation. The joint is formed by screwing an inner sawtooth thread and an outer sawtooth thread with conicity, thread pitch p between the inner thread and the outer thread is large (more than 10mm), tooth section is of a non-isosceles trapezoid structure, corners of the tooth section are chamfered respectively,side walls of the tooth section have the roughness Ra of 1.6, and width of crest of the inner thread is more than that of root of the outer thread; and the inner thread has a first flank angle of theinner thread and a second flank angle of the inner thread, the outer thread is arranged corresponding to the inner thread, and the outer thread has a first flank angle of the outer thread and a second flank angle of the outer thread. The sawtooth thread of the drill pipe joint integrates advantages of a rectangular thread such as high efficiency and a trapezoidal thread such as high tooth strength, and can bear greater lifting force and thrust as well as greater torque transmission action, thus being applicable to the large-diameter raising-boring operation.
Description
technical field [0001] The invention relates to a joint of mining machinery raise drilling equipment, in particular to a novel zigzag threaded joint structure for the large-diameter drill pipe of the raise drilling machine. Background technique [0002] At present, the joint thread of the drill pipe of the raise drilling rig in the world mostly adopts the tapered joint thread connection method of the American Petroleum Institute (API) standard, and the bottom and the crest of this thread are all flat V-shaped structures. The joint thread is designed for oil drilling, and its main feature is strong tensile capacity, but because of its small torsion resistance, especially in the application of large-diameter drill pipe joint threads in raise drilling, in order to meet the requirements of drilling Torque, only choose a larger thread, resulting in a large diameter of the drill pipe, resulting in a large waste of drill pipe material. At the same time, the thread shackle torque of...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): E21B17/042
Inventor 王强龙志阳武士杰杨红刘志强李维远李恩涛
Owner BEIJING CHINA COAL MINE ENG CO LTD