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

Tool for reducing equivalent circulating density

A density and tool technology, which is applied in the field of tools to reduce the equivalent circulation density, can solve the problems that the downhole drilling fluid contains a large amount of cuttings, affects the drilling work, and has a short service life, so as to achieve good pressure reduction, save operation time, The effect of long service life

Active Publication Date: 2019-10-01
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The depressurization tools mentioned in the former are mostly rotating moving parts inside, which are easy to wear under special working conditions in the mine, have a short service life, and are more complicated to install
The pressure-reducing tool mentioned in the latter simply uses a small nozzle, although the experimental results can achieve the effect of reducing pressure, but the fluid used in the experiment is clear water, which is far from the situation where the downhole drilling fluid contains a large amount of cuttings , so it is easy to cause nozzle blockage during actual work, thus affecting normal drilling work

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
  • Tool for reducing equivalent circulating density
  • Tool for reducing equivalent circulating density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0039] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may a...

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 provides a tool for reducing the equivalent circulating density. The tool comprises an outer cylinder, a one-way check valve assembly, an inner shell and a piston rod, wherein the outercylinder is put in a borehole, and a first annulus is formed between the outer cylinder and the borehole; the outer cylinder is sleeved with a sealing mechanism sealed on the inner wall of the borehole, and the first annulus is separated into an upper annulus and a lower annulus; the sidewall close to the upper end of the outer cylinder is provided with jet holes communicating with the upper annulus, and the sidewall close to the lower end of the outer cylinder is provided with inflow holes communicating with the lower annulus; the one-way check valve assembly is arranged in the outer cylinder, the inner shell is connected with the lower end of the one-way check valve assembly , and a second annulus is formed between the inner shell and the outer cylinder; the sidewall of the inner shell is provided with pressure relief holes, and the bottom wall of the inner shell is provided with a through hole; the piston rod is arranged in the inner shell, the lower end of the piston rod is arranged in the through hole in a penetrating manner, and a piston is arranged at the upper end of the piston rod; and a first flow channel is arranged in the piston, and a second flow channel communicatingwith the first flow channel in a butt joint manner is arranged in the piston rod. The tool for reducing the equivalent circulating density can reduce the equivalent circulating density, realizes the purpose of depressurization and guarantees safe and efficient well drilling.

Description

technical field [0001] The invention relates to the technical field of drilling supporting equipment, in particular to a tool for reducing equivalent circulation density. Background technique [0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art. [0003] With the rapid development of the oil and gas industry, the demand for oil and gas resources continues to grow, so offshore drilling is developing rapidly, and gradually moving towards deep water and ultra-deep water. However, deepwater drilling is currently facing problems such as narrow pressure window and difficult pressure control. Therefore, in response to this problem, various technical means have been used at home and abroad to solve this problem. [0004] To solve this problem, the technologies used include hollow ball double-gradient or multi-gradient drilling and depressurization tools. For hollow ball dual-gradient or mult...

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
IPC IPC(8): E21B21/08E21B21/10
CPCE21B21/08E21B21/10
Inventor 李军张锐尧张辉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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