Near-bit torsion impactor

An impactor and near-drill bit technology, which is applied in the direction of drill bits, drilling equipment, earthwork drilling, etc., can solve the problems of PDC bit rock breaking process instability, PDC bit damage, and reduced bit life, so as to eliminate stick-slip phenomenon and reduce Drilling cost and the effect of fewer vulnerable parts

Inactive Publication Date: 2014-03-12
CNPC BOHAI DRILLING ENG
View PDF7 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon causes torsional vibration of the drill string, making the rock-breaking process of the PDC bit extremely unstable, resulting in damage to the PDC bit and reducing the life of the bit
[0003] In order to solve the problems of stick-slip effect and intermittent sticking of the PDC bit, increase the stability of the PDC bit, and prolong the service life of the bit, the patent US6742609B2 designed a torsional impactor driven by a drilling fluid turbine, and the patent 200910058083.9 designed a The torsional percussion drilling tool driven by a drilling fluid screw drilling tool, but these two drilling tools have complex structures, many vulnerable parts, large pressure loss, and limited service 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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Near-bit torsion impactor
  • Near-bit torsion impactor
  • Near-bit torsion impactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0026] Such as figure 1 As shown, the torsional impactor near the drill bit of the present invention includes a drill collar short 1, a flow divider 2, a torsional impactor, and an impact transmission short 10. The upper end of the drill collar short 1 is connected to the upper drill collar female through the API standard thread. Buckle end connection, the lower end of the drill collar short 1 is connected with the snap ring 11 and the impact transmission short 10, and the shunt 2, torsional impactor, and the drill collar short are installed between the drill collar short 1 and the impact transmission short 10 1 outside, shunt 2, torsional impactor inside.

[0027] The torsional impactor is a multi-cavity structure composed of a threaded pressure plate 3, an upper cover body 4, an impactor shell 5, a hydraulic hammer 6, a commutator 7, a throttle no...

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

No PUM Login to view more

Abstract

The invention discloses a near-bit torsion impactor. The near-bit torsion impactor comprises a drill collar pup joint, a splitter, a torsion impactor body and an impact transmission pup joint. The lower portion of the drill collar pup joint is connected with the impact transmission pup joint, the splitter and the torsion impactor body are installed between the drill collar pup joint and the impact transmission pup joint; a lower port of the splitter is communicated with an inlet of the torsion impactor body; an outlet of the torque impactor body is communicated with the transmission pup joint. The near-bit torsion impactor has the advantages that due to the fact that high-frequency low-amplitude torque impact which is stable in periodicity is generated, impact torque can eliminate the phenomena of PDC bit stick slip and intermittent bit sticking; due to the fact that the near-bit torsion impactor is provided with no electronic part and is of a full-hydraulic mechanical structure, the size is small and the impact process has no interference to an electric instrument which conducts measurement while drilling. The near-bit torsion impactor guarantees that in the drilling process, torque in a drill stem is stable and balanced, drill stem torsion oscillation is reduced and stable work of electric MWD devices, electric LWD devices and the like is facilitated. Parts which are prone to being damaged are few in the near-bit torsion impactor, and the near-bit torsion impactor is stable in work, long in service life and beneficial for lowering well drilling cost.

Description

technical field [0001] The invention relates to an auxiliary rock-breaking tool used in the field of oil and natural gas drilling technology, in particular to a torsional impactor near a drill bit. Background technique [0002] In deep or ultra-deep formations, the rock hardness is high, the drillability level is high, the ROP is slow, and the drilling cost is high. When the PDC bit drills into these formations, it will produce stick-slip effect and intermittent sticking phenomenon. This phenomenon occurs because the teeth of the PDC drill bit accumulate a certain amount of torsional energy when breaking the rock. When the rock under the PDC bit teeth is broken, the torsional impact energy in the drill string is released quickly. This phenomenon makes the drill string produce torsional vibration, which makes the rock-breaking process of the PDC bit extremely unstable, causing damage to the PDC bit and reducing the life of the bit. [0003] In order to solve the problems 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
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/24E21B10/46
Inventor 陈世春李玮丛长江王树超
Owner CNPC BOHAI DRILLING ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products