Method for increasing success rate of chemical plugging of leaking casing damage well

A technology with high success rate and chemistry, applied in chemical instruments and methods, earthwork drilling, sealing/isolation, etc., can solve the problems of poor plugging agent retention, short validity period, low pass rate, etc., and improve the pressure bearing capacity of the formation , prolong the validity period, and improve the success rate of plugging

Active Publication Date: 2016-10-12
PETROCHINA CO LTD
View PDF10 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of poor retention of plugging agent in chemical plugging of l

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
  • Method for increasing success rate of chemical plugging of leaking casing damage well
  • Method for increasing success rate of chemical plugging of leaking casing damage well
  • Method for increasing success rate of chemical plugging of leaking casing damage well

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1:

[0034] In order to overcome the problems of poor plugging agent retention in chemical plugging of lost casing-damaged wells, low qualification rate of 15 MPa after plugging, and short validity period after the pressure test is qualified, this embodiment provides a method such as figure 1 The shown method to improve the success rate of chemical plugging of lost casing damaged wells is for casing damaged wells whose casing damage position is within 1000m. It can be one casing damage point, or multiple casing damage points, and casing damage section. Casing damaged wells with a length of less than 100m can basically be successful at one time, including the following steps:

[0035] Step 1) Determine the remaining wall thickness t of the casing according to the MIT+MTT wellbore inspection;

[0036] Step 2) Calculate the casing pressure capacity;

[0037] Step 3) Squeeze 20m in the front section of the casing 3 Cleaning fluid, cleaning slugs, cleaning oil stains and co...

Example Embodiment

[0041] Example 2:

[0042] On the basis of Example 1, this example provides a method for improving the success rate of chemical plugging of lost casing-damaged wells. In the step 1), MIT is a multi-arm caliper imager, which is a well developed by the British company Sondex. The diameter imaging logging tool can detect the inner diameter of the casing. The MTT is a magnetic wall thickness logging tool, which is a casing wall thickness damage imaging logging tool developed by the British Sondex company, which can detect the remaining wall thickness of the casing.

Example Embodiment

[0043] Example 3:

[0044] On the basis of Example 2, this example provides a method for improving the success rate of chemical plugging of wells with missing casing damage. In step 2), the casing pressure capacity is calculated according to the formula: p j = 4δt

[0045] Where: p j , Casing bearing pressure, MPa;

[0046] t, the remaining wall thickness of the casing, obtained by logging, mm;

[0047] δ: Coefficient of uneven circumferential corrosion.

[0048] Circumferential non-uniform corrosion coefficient δ is related to corrosion mechanism and time. When it is sheet-shaped and stepped uniform corrosion, δ is taken as 0.8-0.9, when it is spot-shaped and grooved localized corrosion, δ is taken as 0.7-0.8.

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

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for increasing the success rate of chemical plugging of a leaking casing damage well. A casing pipe horizontal pushing method and a three-slug theory are adopted for the casing damage well with a casing damage part located within 1,000 m, wherein the front section is a washing slug, formation water is replaced, oil dirt and corrosive products on the outer wall of a casing pipe are washed, the wettability is changed, and a good gelling environment is provided for a plugging slug; the middle plugging stratum is a main body cementing section and can effectively prevent leaking and plug the stratum, and a pressure bearing section can be built to isolate the formation water from the casing pipe; the tail section is an intermittent replacement slug, multiple times of replacement are performed intermittently, the main body cementing section can be checked and improved, the plugging success rate is increased, and the validity is prolonged.

Description

technical field [0001] The invention relates to the field of treatment of casing damaged wells in oil and gas fields, in particular to a method for improving the success rate of chemical plugging of leakage casing damaged wells. Background technique [0002] Oil and water wells are cased, and the integrity of the wellbore needs to be re-established. Treatment technologies include chemical plugging, casing subsidy, small casing cementing and small casing sidetracking. The latter three technologies all have the problem that the well diameter becomes smaller after treatment, which affects various downhole constructions in the later stage. This problem exists. The existing chemical plugging technology is mainly researched on plugging agents, such as application number: 201410401797.6, fiber ultrafine cement extrusion sealant and its preparation method, application number: 201410404560.3, a high water loss solidification pressure-bearing plugging agent, Application No.: 2013.10...

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): E21B33/13E21B47/002E21B47/08E21B37/06C04B28/06C04B28/34C09K8/52C09K8/467
CPCC04B28/06C04B28/34C09K8/467C09K8/52E21B33/13E21B37/06E21B47/002E21B47/08C04B7/00C04B2103/12C04B2103/0068C04B14/06C04B14/28C04B14/285Y02P20/141
Inventor 王小勇慕立俊李琼玮杨立华奚运涛赵文何治武程碧海张鑫柱饶辰威张育超邱家友
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