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Division connector

An upper limit, sleeve technology, applied in drilling equipment, drilling equipment and methods, earthwork drilling, etc.

Inactive Publication Date: 2017-01-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The first technical problem to be solved by the present invention is: aiming at the "drag pressure" and "stick-slip" caused by the high friction phenomenon existing in the drilling process of deep vertical wells and complex structure wells, a method of reducing the distance between the drill string and the The method of friction between the well walls enables the bit pressure and torque to be smoothly and effectively transmitted to the drill bit, improving the ROP and the limit extension distance of the wellbore

Method used

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Embodiment Construction

[0051] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0052] The method for reducing the friction between the drill string and the borehole wall in the embodiment of the present invention is as follows:

[0053] S10. Determine a position in the drill string according to the requirements of the drill tool assembly and the required weight-on-bit, and install a split joint at the position. The split joint divides the drill string into an upper drill string section and a lower drill string section, wherein The upper end of the split joint is connected to the upper drill string section, and the lower end of the split joint is connected to the lower dril...

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Abstract

The invention discloses a method for reducing friction between a drill column and a well wall and a division connector. The division connector divides the drill column into an upper drill column section and a lower drill column section which are connected with the division connector. According to a selected friction reduction mode, the upper drill column section is driven by a wellhead device to perform axial sliding or circumferential torsion or axial sliding and circumferential torsion motion relative to the lower drill column section. According to the method, the upper drill column section moves relative to the lower drill column section, static friction between the upper drill column section and the well wall become kinetic friction, friction between the upper drill column section and the well wall is reduced, a contact state between the upper drill column section and well wall rock is improved, bit pressure and torque can be smoothly and effectively transmitted to a drill bit, an ultimate extension distance between a penetration rate and a well is improved, the drilling cycle is shortened, and the drilling cost is reduced.

Description

[0001] Solemnly declare: [0002] The present invention is a divisional application of the following application: application date 2014.10.16, application number 201410548757.4, and a Chinese invention patent application with the invention name "a method for reducing friction between drill string and well wall and a split joint". technical field [0003] The invention relates to the technical field of oil and gas drilling, in particular to a method for reducing the friction between the drill string and the well wall during the drilling of deep vertical wells and complex-structured wells, and smoothly transmitting the drilling pressure to the bottom hole drill bit. A split joint that enhances the method. Background technique [0004] The development of deep vertical wells and complex structural well technologies, and the efficient development of complex oil and gas layers, deep oil and gas reservoirs, and offshore oil and gas resources are in line with my country's huge deman...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B17/02
CPCE21B7/00E21B17/02
Inventor 倪红坚王鹏王瑞和霍洪俊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)