Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Overall process under-balance drilling pressure compensation system and method

An underbalanced drilling and pressure compensation technology, which is applied to the automatic control system of drilling, drilling equipment, earthwork drilling and production, etc., can solve the problems of wellhead overpressure, increase the difficulty of wellbore pressure control, and increase the difficulty of pressure control, etc., to achieve The effect of avoiding wellhead overpressure, ensuring safe implementation, and enhancing the ability of pressure control

Inactive Publication Date: 2010-12-29
中国石油集团西部钻探工程有限公司克拉玛依钻井工艺研究院
View PDF2 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the tripping process, the drilling fluid in the wellbore stops circulating, and the formation fluid continuously enters the wellbore with the increase of the drill string volume under the action of pressure difference, which increases the difficulty of wellbore pressure control
Especially when drilling in natural gas reservoirs, natural gas slips and rises in the annular space after entering the wellbore. Under the condition of restricting natural gas expansion, the rising natural gas will bring formation trap pressure to the surface, resulting in overpressure at the wellhead, thus increasing the underbalance of the whole process. Difficulty in pressure control during drilling and tripping

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
  • Overall process under-balance drilling pressure compensation system and method
  • Overall process under-balance drilling pressure compensation system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The present invention is not limited by the following examples, and specific implementation manners can be determined according to the technical solutions of the present invention and actual conditions.

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] The present invention is mainly composed of a wellhead rotating blowout preventer 11, an underbalanced choke manifold 8, a drilling fluid continuous perfusion system and a conventional drilling fluid circulation system. The wellhead rotating blowout preventer 11 is placed The injector 11 and the underbalanced choke manifold 8 are connected by a high-pressure hose 9, and the kill manifold 14 connected through the four-way of the conventional wellhead control device is connected in parallel with the drilling fluid continuous injection system through the double-way, and the drilling fluid is continuously injected The outlet of the pressure well ma...

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 relates to an overall process under-balance drilling pressure compensation system and a method for oil and gas drilling, an underground casing valve (10) is connected on a superior casing string, a wellhead rotary blowout preventer (11) is arranged at an upper end of a wellhead blowout preventer group and is connected with an under-balance throttle manifold (8) through a high-pressure hose (9), a well control manifold (12) which is connected out of a normal wellhead control device by four-pass is connected with a drilling fluid continuous pouring system in parallel by two-pass; and drilling is pulled to the front of the underground casing valve (10), the drilling fluid continuous pouring system grouts, the under-balance throttle manifold (8) controls the pressure in a shaft, and the drilling fluid which is circulated out enters a normal drilling fluid circulating system. In the drilling pulling process, the drilling fluid can be continuously poured into the shaft by a ground pressure compensation system and the bottom-hole pressure can be dynamically controlled simultaneously, thus effectively preventing formation fluid from intruding into the shaft in the drilling pulling process and keeping the steady under-balance state of the shaft.

Description

technical field [0001] The invention relates to an oil and gas underbalanced drilling method, in particular to a method capable of implementing the whole process of underbalanced drilling, that is, a whole process underbalanced drilling pressure compensation system and method. Background technique [0002] In recent years, Underbalanced Drilling (Unbalanced Drilling) technology has developed rapidly worldwide, but as far as the current Underbalanced Drilling technology is concerned, there are still imperfections in the protection of oil and gas layers, mainly reflected in tripping During the process, due to the limitations of the current process and technology, in order to avoid accidents such as overflow and blowout during tripping, it is necessary to inject heavy drilling fluid into the well before tripping to balance the formation pressure. The heavy injection of drilling fluid before tripping will often lead to the loss of the underbalanced state in which the wellbore fl...

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): E21B44/00E21B21/08E21B33/03
Inventor 伊明杨刚陈若铭宋朝晖魏强
Owner 中国石油集团西部钻探工程有限公司克拉玛依钻井工艺研究院
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
Eureka Blog
Learn More
PatSnap group products