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Well cementation process suitable for gas field

A cementing and process technology, used in wellbore/well components, drilling compositions, products, etc., can solve the problems of the overall pressure bearing capacity and sealing performance, and achieve low cost, good rheological performance, and low cost. The effect of density

Inactive Publication Date: 2020-04-10
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a cementing process suitable for gas fields, which solves the problem that the two-stage cementing technology in the prior art leads to the decline of the overall pressure bearing capacity and sealing performance

Method used

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  • Well cementation process suitable for gas field
  • Well cementation process suitable for gas field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1. Inject drilling fluid into the well for a pressure test, and if leakage occurs in the well, plug the leaking formation;

[0038] Step 2. Lower multiple casings to the bottom of the well one by one, add centralizers into the well to ensure that the casings are centered, and inject mud between the well wall and the casing every time 20 casings are run, and ensure that the drilling fluid is circulated for at least two times in the middle. Second, adjust the performance of the drilling fluid after running the casing to ensure that the bottom of the well is clean and free of sand;

[0039] Step 3. Inject pre-fluid, first cementing fluid, and second cementing fluid into the casing in sequence, and then release the rubber plug, and use the rubber plug to scrape off the first cementing fluid and the second cementing fluid on the inner wall of the casing ;

[0040] The first cementing fluid includes the following components according to the mass fraction: Three Gorges G...

Embodiment 2

[0043] Step 1. Inject drilling fluid into the well for a pressure test, and if leakage occurs in the well, plug the leaking formation;

[0044] Step 2. Lower multiple casings to the bottom of the well one by one, add centralizers into the well to ensure that the casings are centered, and inject mud between the well wall and the casing every time 22 casings are run, and ensure that the drilling fluid is circulated for at least two times in the middle. Second, adjust the performance of the drilling fluid after running the casing to ensure that the bottom of the well is clean and free of sand;

[0045] Step 3. Inject pre-fluid, first cementing fluid, and second cementing fluid into the casing in sequence, and then release the rubber plug, and use the rubber plug to scrape off the first cementing fluid and the second cementing fluid on the inner wall of the casing ;

[0046] The first cementing fluid includes the following components according to the mass fraction: Three Gorges G g...

Embodiment 3

[0049] Step 1. Inject drilling fluid into the well for a pressure test, and if leakage occurs in the well, plug the leaking formation;

[0050] Step 2. Lower multiple casings to the bottom of the well one by one, add centralizers into the well to ensure that the casings are centered, and inject mud between the well wall and the casing every time 25 casings are run, and ensure that the drilling fluid is circulated for at least two times in the middle. Second, adjust the performance of the drilling fluid after running the casing to ensure that the bottom of the well is clean and free of sand;

[0051] Step 3. Inject pre-fluid, first cementing fluid, and second cementing fluid into the casing in sequence, and then release the rubber plug, and use the rubber plug to scrape off the first cementing fluid and the second cementing fluid on the inner wall of the casing ;

[0052] The first cementing fluid includes the following components according to the mass fraction: Three Gorges G...

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Abstract

The invention discloses a well cementation process suitable for a gas field. The well cementation process comprises the following steps of injecting drilling fluid into a well to perform a pressure-bearing test, and performing leaking stoppage for a leaked stratum if leakage occurs in the well; driving a sleeve to the well bottom, and filling mud into a position between the well wall and the sleeve; sequentially injecting prepad fluid, first well cementation fluid and second well cementation fluid into the sleeve, then, starting to release a rubber plug, and utilizing the rubber plug to scrapeoff the first well cementation fluid and the second well cementation fluid on the inner wall of the sleeve; and injecting plug pressing fluid into the sleeve until touching and pressing happen, and ending well cementation. The pressure-bearing test is performed before the sleeve is driven in, and leakage prevention and stoppage are performed on the leaked stratum, so that pressure-bearing abilityof a well shaft can be improved.

Description

technical field [0001] The invention belongs to the technical field of well cementing technology, and relates to a well cementing technology suitable for gas fields. Background technique [0002] For some "three-low" gas fields, leakage is very easy to occur during the cementing process. In order to ensure the sealing quality, the two-stage cementing technology is mainly used for wells with a well depth (vertical depth) exceeding 2500m, but the two-stage cementing takes a long time. The cost is high, and the graded hoop in the casing string leads to a decrease in the overall pressure bearing capacity and sealing performance, which affects the production life of the gas well. Contents of the invention [0003] The purpose of the present invention is to provide a well cementing process suitable for gas fields, which solves the problem that the two-stage well cementing technology in the prior art causes the overall pressure bearing capacity and sealing performance to decrease...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13C09K8/42C09K8/467C09K8/473
CPCC09K8/426C09K8/467C09K8/473E21B33/13Y02P20/141
Inventor 刘刚白传中凡朝波马飞马晓龙张永利胡伟闫宇哲刘德臣
Owner SHAANXI YANCHANG PETROLEUM GRP
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