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Expandable low-density cement paste and preparation method thereof

A technology of cement slurry and low density, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing slurry density and failure to plug leakage, and achieves increasing static friction resistance, preventing leakage, and compatibility good sex effect

Inactive Publication Date: 2011-11-23
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that existing low-density cement slurry cementing technology cannot stop leakage, and develop and provide an expandable low-density cement slurry. The present invention has a certain expandability, so it has The volume expansion under the condition of pressure difference, through the expansion of the volume, firstly reduces the density of the slurry, and secondly, the expansion increases the flow friction in the annulus of the borehole wall. Both functions can prevent leakage and achieve and achieve the purpose of preventing leakage

Method used

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  • Expandable low-density cement paste and preparation method thereof
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  • Expandable low-density cement paste and preparation method thereof

Examples

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Embodiment 1

[0026] An expandable low-density cement slurry, comprising the following components:

[0027] Cement 60%,

[0028] Compound Lightener 40%,

[0029] In the present invention, the water-solid ratio is clear water of 0.70. The cement is grade G oil well cement. The composite lightening agent is cementing lightening agent G403-GJQ. Described clear water is industrial fresh water. The density of the cement slurry is 1.20g / cm 3 .

[0030] A preparation method of expandable low-density cement slurry, comprising the steps of:

[0031] a. Primary dry ash mixing: uniformly mix cement and composite lightening agent according to the ratio requirements to form mixed dry ash;

[0032] b. Secondary slurry mixing in construction: add industrial fresh water to the dry ash material mixed in the first mixing, with a water-solid ratio of 0.70, and mix it into a uniform cement slurry.

[0033] The invention also includes the step of naturally thickening the cement slurry, and the natural t...

Embodiment 2

[0035] An expandable low-density cement slurry, comprising the following components:

[0036] Cement 90%,

[0037] Compound Lightener 10%,

[0038] Clear water with a water-solid ratio of 1.1.

[0039] In the present invention, the cement is grade G oil well cement. The composite lightening agent is cementing lightening agent G403-GJQ. Described clear water is industrial fresh water. The density of the cement slurry is 1.60g / cm 3 .

[0040] A preparation method of expandable low-density cement slurry, comprising the steps of:

[0041] a. Primary dry ash mixing: uniformly mix cement and composite lightening agent according to the ratio requirements to form mixed dry ash;

[0042] b. Secondary slurry mixing in construction: add industrial fresh water to the dry ash material mixed in the first mixing, with a water-solid ratio of 1.1, and mix it into a uniform cement slurry.

[0043] The invention also includes the step of naturally thickening the cement slurry, and the na...

Embodiment 3

[0045] An expandable low-density cement slurry, comprising the following components:

[0046] Cement 70%,

[0047] Compound Lightener 30%,

[0048] Clear water with a water-solid ratio of 0.85.

[0049] In the present invention, the cement is grade G oil well cement. The composite lightening agent is cementing lightening agent G403-GJQ. Described clear water is industrial fresh water.

[0050] A preparation method of expandable low-density cement slurry, comprising the steps of:

[0051] a. Primary dry ash mixing: uniformly mix cement and composite lightening agent according to the ratio requirements to form mixed dry ash;

[0052] b. Secondary slurry mixing in construction: add industrial fresh water to the dry ash material mixed in the first mixing, with a water-solid ratio of 0.85, and mix it into a uniform cement slurry.

[0053] The invention also includes the step of naturally thickening the cement slurry, and the natural thickening time is 150 minutes.

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Abstract

The invention discloses an expandable low-density cement paste and a preparation method thereof. The expandable low-density cement paste includes components in the following proportion: 60-90% of cement, 10-40% of composite lightening admixture and clean water with water-solid ratio of 0.70-1.1. The preparation method of the expandable low-density cement paste comprises the following steps of: a, primarily mixing dry ash: uniformly mixing the cement and the composite lightening admixture according to the proportion requirements to form mixed dry ash; b, carrying out secondary paste mixing: adding industrial fresh water into the dry ash material which is primarily mixed in the water-solid ratio of 0.70-1.1; mixing the water and the material to form a uniform cement paste. The expandable low-density cement paste provided by the invention has certain expandability, thereby having volume expansion under loss and pressure difference conditions. Through the expandability of the volume, the density of the paste is firstly reduced, and then flow friction of the annular space of a well wall is increased due to the expansion; and two functions have the effect of preventing loss and achieve and realize the aim of preventing loss.

Description

technical field [0001] The invention relates to an expandable low-density cement slurry and a preparation method thereof, belonging to the field of oil field cementing technology, and is an expandable pressure-adaptive low-density cement slurry used for sealing low-pressure and leaky formations in the cementing profession of the drilling industry and its preparation method. Background technique [0002] With the emphasis on the development of low-efficiency oil and gas reservoirs (low-pressure, low-permeability, easy-to-leakage formations) and the requirements for reservoir protection are getting more and more attention. 3 , leakage pressure 1.25-1.40g / cm 3 The development technology requirements in the low-pressure and easy-to-leak layer) are getting higher and higher. During the cementing construction, the cement slurry leakage caused by the leakage of the low-pressure formation section has seriously affected the cementing quality and the productivity and life of the oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/473C09K8/487
Inventor 魏周胜周兵温雪丽李波陈宁李志宏李海龙姜向祖
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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