Seal-examining testing method

A test method and seal inspection technology, which is applied in surveying, earthwork drilling, wellbore/well components, etc., can solve problems such as difficult to detect packer tightness, poor formation water absorption effect, high formation pressure, etc.

Pending Publication Date: 2020-10-09
PETROCHINA CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For some water wells, the long-term water injection in the production process leads to higher and higher formation pressure, and the formation water absorption effect is getting worse and worse. The pressure of the space is basically kept constant, making it difficult to judge the tightness of the packer to be tested

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
  • Seal-examining testing method
  • Seal-examining testing method
  • Seal-examining testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] figure 1 It is a schematic diagram of the sealing test process. Such as figure 1 As shown, casing 11 and tubing 12 are arranged in the well. A casing protection packer 13 and a packer to be tested 14 are arranged between the tubing 12 and the casing 11 , and the casing protection packer 13 is located above the packer 14 to be tested. The casing protection packer 13 and the packer to be tested 14 divide the annular space between the casing 11 and the tubing 12 into a lower annular space A and an upper annular space B, and the lower annular space A is located in the packer 14 to be tested. The lower annular space, the upper annular space B is the annular space between the casing protection packer 13 and the packer 14 to be test...

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 seal-examining testing method. The method comprises the steps that a seal-examining tester is lowered into a water distributor working barrel located in a casing pipe; wateris continuously injected into an oil pipe at a constant pressure, wherein the duration of continuous water injection is not less than 24 hours; and the first pressure and the second pressure are continuously detected in the water injection period. If sealing of a packer to be detected fails, the injected water can directly enter an upper annular space through the packer to be detected, so that thesecond pressure is basically the same as the first pressure in the water injection period, and the difference value between the first pressure and the second pressure does not exceed the preset threshold value all the time; and if tight sealing of the packer to be detected is achieved, the injected water cannot enter the upper annular space through the packer to be detected, when water injectionis started, the pressure in the stratum is relatively large, the difference value between the first pressure and the second pressure is relatively small, along with water injection, the stratum continuously absorbs the water, then the stratum pressure is gradually reduced, the second pressure is gradually reduced, and the difference value between the first pressure and the second pressure gradually exceeds the preset threshold value.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a sealing test method. Background technique [0002] In oil production engineering, packers can be used to stratify formations. An annular space is formed between the casing and the tubing in the water well, and a packer is arranged between the casing and the tubing, and the tightly sealed packer can isolate the annular space. [0003] In order to ensure normal production, it is usually necessary to conduct a seal test, that is, to detect the tightness of the packer. At present, during the seal test, the seal tester will be lowered into the water distributor mandrel located in the casing. The seal tester has two pressure sensors, one of which can detect the casing protection packer (referred to as the most The pressure of the annular space between the packer near the wellhead) and the packer to be tested, and another pressure sensor can detect the pressure of the annular...

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): E21B47/117E21B47/06
CPCE21B47/06
Inventor 张智峰马明黎明谢飞郑利江孟庆伟李得胜
Owner PETROCHINA CO LTD
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

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap