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Dry wellbore well cementation cement slurry

A technology for cementing cement slurry and dry well, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing air drilling efficiency, huge thickness of hole wall and virtual mud cake, and long cementing preparation time, etc. Achieve good social and technical economic benefits, speed up exploration, and speed up the effect of promoting technological progress

Active Publication Date: 2012-10-17
成都欧美克石油科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the conversion from air drilling to mud cementing, collapse and leakage often occur due to the instability of the well wall, and the formation of a thick virtual mud cake on the well wall makes it difficult to run the casing, and it takes a long time to change the mud and prepare the wellbore. Conventional casing cementing itself has poor displacement efficiency. These factors lead to long cementing preparation time and poor cementing quality, which reduces the benefits of air drilling to a certain extent

Method used

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  • Dry wellbore well cementation cement slurry
  • Dry wellbore well cementation cement slurry
  • Dry wellbore well cementation cement slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Embodiment 1: This embodiment is the best embodiment of the present invention.

[0076] Dry wellbore cementing cement slurry, which comprises the following components, and the weight ratio of each component is:

[0077] Grade G cement 100,

[0078] fluid loss reducer 1.4,

[0079] Anti-channeling agent 2.8,

[0080] Anti-salt retarder 1.0,

[0081] Defoamer 0.2,

[0082] Fiber 0.2;

[0083] The fluid loss reducing agent is any one or more of AMPS polymers, ketone-aldehyde condensations and PVA systems; the anti-channeling agent is fiber powder and silicon oxide, and the weight ratio of fiber powder and silicon oxide is 1 : 3; the anti-salt retarder is AMPS polymer; the defoamer is polyether.

[0084] The anti-channeling agent is a powder obtained by grinding fiber powder and silicon oxide.

[0085] The fiber length is 5 mm.

Embodiment 2

[0087] Dry wellbore cementing cement slurry, which comprises the following components, and the weight ratio of each component is:

[0088] Grade G cement 100,

[0089] fluid loss reducer 1,

[0090] anti-channeling agent 2,

[0091] Anti-salt retarder 1.5,

[0092] Defoamer 0.5,

[0093] fiber 0.5;

[0094] The fluid loss reducing agent is any one or more of AMPS polymers, ketone-aldehyde condensations and PVA systems; the anti-channeling agent is fiber powder and silicon oxide, and the weight ratio of fiber powder and silicon oxide is 1 : 4; the anti-salt retarder is AMPS polymer; the defoamer is polyether.

[0095] The anti-channeling agent is a powder obtained by grinding fiber powder and silicon oxide.

[0096] The fiber length is 3mm.

Embodiment 3

[0098] Dry wellbore cementing cement slurry, which comprises the following components, and the weight ratio of each component is:

[0099] Grade G cement 100,

[0100] fluid loss reducer 2,

[0101] anti-channeling agent 3,

[0102] Anti-salt retarder 0.5,

[0103] Defoamer 0.1,

[0104] fiber 0.1;

[0105] The fluid loss reducing agent is any one or more of AMPS polymers, ketone-aldehyde condensations and PVA systems; the anti-channeling agent is fiber powder and silicon oxide, and the weight ratio of fiber powder and silicon oxide is 1 : 5; the anti-salt retarder is AMPS polymer; the defoamer is polyether.

[0106] The anti-channeling agent is a powder obtained by grinding fiber powder and silicon oxide.

[0107] The fiber length is 7mm.

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Abstract

The present invention discloses a dry wellbore well cementation cement slurry, which comprises the following components, by weight, 100 parts of class G cement, 1-2 parts of a fluid loss additive, 2-3 parts of an anti-channeling agent, 0.5-1.5 parts of an anti-salt retarder, 0.1-0.5 parts of an antifoaming agent, and 0.1-0.5 parts of fiber, wherein the fluid loss additive is one or a plurality of materials selected from an AMPS polymer, a ketoaldehyde condensation material and a PVA system, the anti-channeling agent is fibrous powder and silicon oxide, the anti-salt retarder is an AMPS polymer, and the antifoaming agent is a polyether. The beneficial effects of the cement slurry of the present invention are that: the cement slurry has characteristics of strong anti-dehydration performance, wall making performance, strong blocking performance and good flow property, and is insensitive to changes of density and temperature; the occurrence of the complex condition of gas-liquid replacement is avoided, and safe downward entering of casing, operation safety and well cementation quality are ensured so as to provide important practical significances, good social benefits, technical benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of gas drilling and completion technology, in particular to a dry wellbore cementing cement slurry. Background technique [0002] In the conversion from air drilling to mud cementing, collapse and leakage often occur due to the instability of the well wall, and the formation of a thick virtual mud cake on the well wall makes it difficult to run the casing, and it takes a long time to change the mud and prepare the wellbore. Conventional casing cementing itself has poor displacement efficiency. These factors lead to long cementing preparation time and poor cementing quality, which reduces the benefits of air drilling to a certain extent. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a dry wellbore cement that solves the bottleneck problem of conventional cementing technology and improves the quality of cementing, shortens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
Inventor 曹智卢德安孙庚
Owner 成都欧美克石油科技股份有限公司
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