Ultra-long combined square drill rod and machining methods thereof

A processing method and kelly technology, which is applied in the direction of drill pipe, earthwork drilling, drill pipe, etc., can solve the problems of inability to realize integral structure and length exceeding the processing range, etc., so as to improve drilling efficiency and drilling depth , cost reduction effect

Inactive Publication Date: 2018-10-12
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In actual production, due to the production of non-standard kelly with a length greater than 16 meters, in the process of blank production, material heat treatment and machine tool processing, the length problem is beyond the processing range, and the integral structure cannot be realized

Method used

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  • Ultra-long combined square drill rod and machining methods thereof
  • Ultra-long combined square drill rod and machining methods thereof
  • Ultra-long combined square drill rod and machining methods thereof

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Embodiment Construction

[0024] The present invention will be further elaborated and illustrated below in conjunction with specific embodiments and accompanying drawings.

[0025] See attached figure 1 , 2 , an ultra-long combined square kelly, comprising an upper kelly and a lower kelly, both of which are hollow structures and both of which are composed of a joint end and a milled square end , the upper kelly milling square end 4 is threadedly connected to the lower kelly milling square end 6, and an upper kelly internal thread of type 6 5 / 8REG-LH is provided in the front end of the upper kelly joint end 3 1. At the rear end of the upper kelly milling square end 4, there is an upper kelly double shoulder external thread 2 of model ZYNC46, the length of the upper kelly is 13625 mm, and the lower kelly The front end of the joint end 7 is provided with a lower kelly external thread 5 of model 5 1 / 2FH, and the lower kelly milling square end 8 is provided with a lower kelly double-shoulder internal thre...

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Abstract

The invention relates to an ultra-long combined square drill rod and machining methods thereof. The ultra-long combined square drill rod of 27 m is combined through a non-standard square drill rod of13.625 m and a non-standard square drill rod of 13.5 m. The machining methods comprise through hole drilling after blank heat treatment, cylindrical turning, turning of inner and outer threads of thesquare drill rods at the upper and lower ends, screwing of the square drill rods at the upper and lower ends, datum plane milling and the like. During using by a user on a well, only double-shoulder ZYNC46 threads of the two square drill rods need to be in butt joint, the same torque value of 22460 foot-pounds is applied for screwing, the milled square faces of the two square drill rods are flush,and then the whole ultra-long combined square drill rod with the length being 27 m is combined. The drilling depth of downward drilling at a time can reach 27 m, the drilling depth is increased by twice or more, the drilling efficiency is improved greatly, and the technical problems that the length of downward drilling at a time is limited due to limitation that the total length of an API standard square drill rod is 12.19 m is solved.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling tools, and in particular relates to a 27-meter-long ultra-long combined square kelly and a processing method. Background technique [0002] Kelly is one of the important special drilling tools for oil drilling. In rotary drilling, the kelly is located at the uppermost end of the entire drill string, and the kelly cooperates with the square bushing and the rotary bushing to transmit the torque of the ground rotary table to the drill pipe to drive the drill bit to rotate. When drilling, as the well continues to deepen, the drill pipe will also be lengthened in time. The length of the standard kelly is 12.19 meters. Due to the length limitation, only one drilling tool can be replaced one by one at a time, which greatly affects the drilling efficiency. Oilfields often use 3 pieces as a group to form a string of drilling tool assemblies. The length of a string of drilling tool assemblies i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00E21B17/042
CPCE21B17/00E21B17/042
Inventor 甄世路周长波刘岩瞿伟杰付朝波苗鸿洁李传周李恺仇炳刚
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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