Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Near drill local low pressure drilling tool

A drilling tool and near-bit technology, which is used in drill bits, drilling equipment, earth-moving drilling, etc., and can solve the problems of prone to well waste, large investment, and expansion of wellbore.

Inactive Publication Date: 2007-10-17
SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage, the underbalanced technology of the whole well section is only applicable to some formations, and this technology has high requirements for equipment capacity, large investment, and is prone to complex situations such as well spattering and borehole expansion, and the conditions for large-scale application are not yet mature.

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 drill local low pressure drilling tool
  • Near drill local low pressure drilling tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] The present invention will be further described now in conjunction with the accompanying drawings of the description.

[0009] When using the present invention for hydraulic pulse low-pressure drilling construction, the casing [4] is hollow cylindrical, with threads processed at both ends, and the limit plug [8] processed with a flow channel is loaded into the lower end of the casing [4] , the inner tube [3] is hollow cylindrical, and the upper and lower ends are respectively processed with an upper back pressure hole [2] and a lower back pressure hole [7]. The spool valve [5] of the center flow channel is loaded into the inner lower end of the inner tube [3] sequentially, wherein the spool valve [5] and the inner tube [3] are sealed, and the lower end of the spool valve [5] extends into the spool valve spring [ 6], the shoulder of the spool valve [5] is in contact with the upper end surface of the spool valve spring [6], and then the inner tube [3] is fitted into the h...

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

A well drilling tool able to generate local low pressure near the drill bit for increasing drilling speed is composed of commutating jointer, internal tube, casing, slide valve with spring, and limited blocking head. It features that the channel of drilling liquid is periodically blocked to generate negative pressure and the negative pressure is delivered to well bottom.

Description

technical field [0001] The invention belongs to a supporting device for oil and natural gas drilling. Background technique [0002] As the well depth increases, the drilling speed gradually decreases. The reasons can be summarized as the following two aspects. (1) Under the action of the pressure difference between the bottom hole liquid column pressure and the formation pore fluid pressure, the cuttings generated by the rock broken by the drill bit are crushed. Pressed in place and repeatedly cut by the drill bit, it hinders the exposure of the new broken surface of the rock and reduces the efficiency of the drill bit in rock-breaking drilling, that is, the "holding effect". (2) The rock at the bottom of the well is subjected to the pressure σ of the overlying strata h e and the normal stress σ of the bottom hole fluid column n e the role of general 0 < σ n e <...

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 Patents(China)
IPC IPC(8): E21B10/60
Inventor 倪红坚韩来聚李作会
Owner SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com