Light-bead leakage-proof cement paste for well cementation and manufacturing technology

A technology of cement slurry and oil well cement, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor stability of cement slurry, formations prone to pressure leakage, and insignificant changes in volume pressure, etc., to achieve Increase the strength of the slurry structure, avoid formation leakage, and improve the effect of the pore structure

Active Publication Date: 2012-06-20
CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing cement slurry system will cause serious leakage, low return of cement, poor sealing quality of some oil layers or leakage of oil layers. The return is not high enough, but if the density of the cement slurry system is too low, the quality of cement cementation will deteriorate, causing quality problems in well cementing; the main problems in cementing with ordinary cement slurry systems are:
[0003] 1. The cement slurry system of ordinary sealing oil layer has a high density, all of which are greater than 1.85 g / cm 3 , easy to leak out formations with low pressure bearing capacity;
[0004] 2. The volume of ordinary low-density cement slurry system does not change significantly with pressure, and cannot effectively slow down and prevent leakage during the cementing process;
[0005] 3. Fly ash low-density cement paste has poor stability, and the density is generally 1.45 g / cm 3 About, the thickening time is more than 350min, and the water separation is about 10%, which is prone to stratification

Method used

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  • Light-bead leakage-proof cement paste for well cementation and manufacturing technology
  • Light-bead leakage-proof cement paste for well cementation and manufacturing technology
  • Light-bead leakage-proof cement paste for well cementation and manufacturing technology

Examples

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Effect test

Embodiment 1

[0046] Example 1: This light bead anti-leakage cement slurry for well cementing is made by compounding G grade oil well cement and light bead according to the weight ratio, wherein:

[0047] 70 parts of G grade oil well cement;

[0048] 30 parts of light beads;

[0049] 80 parts of water;

[0050] Grade G oil well cement (this cement is available in cement manufacturers all over the country and is a general material), light beads were purchased from Gansu Qingyang Yuhui Building Materials Co., Ltd. Tel: 0934-6659691 Mobile: 15109342598.

[0051] The light beads are light-weight materials compounded from silicon-aluminum ultra-light material components, with a particle size of 60 μm, a large specific surface area, and low water absorption. Therefore, the prepared cement paste has good fluidity and stability. At the same time, it can improve the high temperature resistance of cement stone, prevent the decline of cement stone strength under high temperature conditions, and impr...

Embodiment 2

[0078] Concrete preparation step is identical with embodiment 1 difference is that selection parameter is different:

[0079] 60 parts of G grade oil well cement;

[0080] 10 parts of light beads;

[0081] 65 parts of water.

[0082] The particle size of light beads is 30μm,

[0083] The density of the cement slurry system is 1.24g / cm 3 ;

[0084] The thickening time is 180min;

[0085] Described free water volume ratio is 1.6%;

[0086] The compressive strength is 24 hours compressive strength 4MPa;

[0087] The water-solid ratio is 0.65;

[0088] The addition of the light beads accounts for 10% of the total weight.

Embodiment 3

[0090] Concrete preparation step is identical with embodiment 1, and difference is that selection parameter is different:

[0091] G grade oil well cement 90 parts;

[0092] 40 parts of light beads;

[0093] 95 parts of water;

[0094] The particle size of light beads is 80μm,

[0095] The density of the cement slurry system is 1.60g / cm 3 ;

[0096] The thickening time is 300 min;

[0097] Described free water volume ratio is 4.1%;

[0098] The compressive strength is that the 24-hour compressive strength is greater than 7MPa;

[0099] The water-solid ratio is 0.95;

[0100] The added amount of the light beads accounts for 10%-40% of the total weight.

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Abstract

The invention relates to light-bead leakage-proof cement paste for well cementation and a manufacturing technology; the light-bead leakage-proof cement paste is characterized in that the light-bead leakage-proof cement paste is compounded by G-grade oil-well cement and light beads according to a weigh proportion, wherein the G-grade oil-well cement accounts for 60-90 parts, the light beads accounts for 10-40 pats and water accounts for 65-95 parts. The light-bead leakage-proof cement paste aims at overcoming the defects of the prior art. The volume of the light-bead leakage-proof cement paste system provided by the invention obviously changes along with the change of pressure so that the system density of the cement paste can be effectively reduced, and the cementation quality of cement stones can also be increased; when leakage happens, the light-bead leakage-proof cement paste has the effects of leakage slowdown and leaking stoppage.

Description

technical field [0001] The invention relates to a light bead anti-leakage cement slurry for well cementing and a preparation process thereof. Background technique [0002] The existing cement slurry system will cause serious leakage, low return of cement, poor sealing quality of some oil layers or leakage of oil layers. The return is not high enough, but if the density of the cement slurry system is too low, the quality of cement cementation will deteriorate, causing quality problems in well cementing; the main problems in cementing with ordinary cement slurry systems are: [0003] 1. The cement slurry system of ordinary sealing oil layer has a high density, all of which are greater than 1.85 g / cm 3 , easy to leak out formations with low pressure bearing capacity; [0004] 2. The volume of ordinary low-density cement slurry system does not change significantly with pressure, and cannot effectively slow down and prevent leakage during the cementing process; [0005] 3. Fly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/487C09K8/473
Inventor 贾芝王大权窦虎清冯文革王瑞玲冯旺成
Owner CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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