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Annular equivolume well cementation method

A volume and cementing technology, applied in earth-moving drilling, wellbore/well components, sealing/packaging, etc., can solve the problems of waste of cement slurry, unqualified cementing quality, and insufficient cement slurry, etc. Low engineering cost, broad market application space, and avoiding the effect of low return

Inactive Publication Date: 2015-02-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem of this method is that due to the deviation of logging data or empirical data, the amount of cement slurry injected during the cementing process is too small or too much, resulting in low return of cement, unqualified cementing quality or a large amount of cement slurry being wasted. Economic losses

Method used

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  • Annular equivolume well cementation method
  • Annular equivolume well cementation method
  • Annular equivolume well cementation method

Examples

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Embodiment 1

[0032] This embodiment provides a cementing method with equal annular space, which includes the following steps:

[0033] Prepare marker solution:

[0034] Before the cementing construction, the requirements for the performance of the marking fluid are determined according to the previous drilling construction conditions, and the marking fluid is prepared. Because water-based drilling fluid was used in the previous drilling construction, and the requirements for suspended cuttings and solid particles were high, the marking fluid in this example was composed of water, nonyl polyoxyethylene ether, barite, polypropylene cellulose sodium salt , red fluorescent powder and cinnabar are fully stirred evenly in the circulation tank to obtain a marking liquid, wherein the mass ratio of water, nonyl polyoxyethylene ether, barite, polypropylene cellulose sodium salt, red fluorescent powder and cinnabar is 6.5 :0.4:0.7:0.4:1:1.

[0035] Inject marker fluid:

[0036] Connect the guide s...

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Abstract

The invention provides an annular equivolume well cementation method, wherein the method includes the following steps: a float collar of a casing string is put into a well, marking liquid is then injected into the casing string, and when the casing string is completely put into the well, the casing string is filled up with the marking liquid; grout is injected into the casing string, and when the marking liquid is discovered to return to the mouth of the well, the injection of the grout is stopped immediately; the grout in the casing string is replaced, replacement is finished when pressure is bumped, cement is cured until a cement ring is formed, and the operation of annular equivolume well cementation is complete. The annular equivolume well cementation method in the invention can increase the quality of well cementation, moreover, construction is simple and convenient, the reliability is high, the construction cost is low, the practicability is high, and the annular equivolume well cementation method has a broad market application space.

Description

technical field [0001] The invention provides an equal annular volume cementing method, which belongs to the field of petroleum natural well cementing. Background technique [0002] With the continuous improvement and innovation of oilfield exploration and development technology, new requirements are constantly put forward for the quality of cementing. At present, before cementing construction, the amount of cement slurry and additives used for cementing are usually prepared according to well logging data or regional construction experience. , complete the cementing construction after bumping. The main problem of this method is that due to the deviation of logging data or empirical data, the amount of cement slurry injected during the cementing process is too small or too much, resulting in low cement return, unqualified cementing quality or a large amount of cement slurry being wasted. Economic losses. Contents of the invention [0003] In order to solve the above tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 翟栓记吴东奎佟德水刘明涛郭红峰吴国军杨杨赵景春陶丹陆浩宇
Owner PETROCHINA CO LTD
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