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Method for preparing foamed cement slurry

A preparation method and cement slurry technology are used in the control of the mixing ratio of foam and cement slurry, and in the field of preparation of foamed cement slurry, which can solve the problems that the proportion of foam and cement slurry cannot be controlled.

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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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 invent a preparation method of foam cement slurry, solve the problem that the ratio of foam and cement slurry cannot be controlled by finding a foam and cement slurry mixing method for on-site application, and finally prepare foam cement slurry that meets the design density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] In the foam field cementing construction operation, the foam cement slurry density ρ is passed according to the needs of the field operation 1 The target foam cement slurry density ρ set by the setting and detection module 11 1 1.4g / cm 3 .

[0079] In order to have the foamed cement slurry with the above-mentioned target density, first pass the cement slurry density 2 Detection module 10 measures the density of cement-based slurry 1.88g / cm 3 , Control foam injection pressure P 0 =0.4MPa, through the first flow F 1 The control module 8 presets the first flow rate F of the foam cement slurry equipment outlet 1 =0.8m 3 / min, through the second flow F 2 The control module 9 adopts the formula I::ρ 1 =ρ 2 *F 2 / F 1 Calculate and adjust the second flow F 2 =0.6m 3 / min; the target foam cement slurry density is 1.4g / cm 3 .

Embodiment 2

[0081] In the foam field cementing construction operation, the foam cement slurry density ρ is passed according to the needs of the field operation 1 The target foam cement slurry density ρ set by the setting and detection module 11 1 1.0g / cm 3 .

[0082] In order to have the foamed cement slurry with the above-mentioned target density, first pass the cement slurry density 2 Detection module 10 measures the density of cement-based slurry 1.88g / cm 3 , Control foam injection pressure P 0 =0.4MPa, through the first flow F 1 The control module 8 presets the first flow rate F of the foam cement slurry equipment outlet 1 =0.8m 3 / min, through the second flow F 2 The control module 9 adopts the formula I::ρ 1 =ρ 2 *F 2 / F 1 Calculate and adjust the second flow F 2 =0.4m 3 / min; get the target foam cement slurry density 1.0g / cm 3 .

Embodiment 3

[0084] In the foam field cementing construction operation, the foam cement slurry density ρ is passed according to the needs of the field operation 1 The target foam cement slurry density ρ set by the setting and detection module 11 1 1.2g / cm 3 .

[0085] In order to have the foamed cement slurry with the above-mentioned target density, first pass the cement slurry density 2 Detection module 10 measures the density of cement-based slurry 1.6g / cm 3 , Control foam injection pressure P 0 =0.4MPa, through the first flow F 1 8 control modules preset the first flow rate F at the outlet of the foam cement slurry equipment 1 =0.8m 3 / min, through the second flow F 2 The control module 9 adopts the formula I::ρ 1 =ρ 2 *F 2 / F 1 Calculate and adjust the second flow F 2 =0.6m 3 / min; the target foam cement slurry density is 1.2g / cm 3 .

[0086] Table 1

[0087]

[0088] Through the method of the invention, the outlet displacement of the cement pump can be stabilized and the displacement of the p...

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Abstract

The invention discloses a method for controlling a mixing ratio of foam and cement slurry in preparation of formed cement slurry. The method comprises the steps of: i), providing a foam and cement slurry mixing device, wherein the device comprises foamed cement slurry equipment, a first volume flow meter, cement slurry mixing equipment and foam equipment of which the pressure is controlled by a pressure gauge; ii), controlling a first flow F1 of the foam cement slurry flowing into an oil well by using the first volume flow meter, and controlling a second flow F2 of the cement slurry flowing into the foamed cement slurry equipment by using the second volume flow meter; and iii), measuring slurry density Rho 2, fixing the first flow F1, and adjusting the density of the foamed cement slurry according to a formula that Rho 1 is equal to Rho 2 * F2 / F1 until the Rho 1 reaches a target value, wherein the pressure in a foam tank is constant.

Description

Technical field [0001] The invention relates to a method and device for preparing foam cement slurry and its application, in particular to a method for controlling the mixing ratio of foam and cement slurry used in on-site cementing construction, and belongs to the field of low-density cementing in oil fields. Background technique [0002] Foamed cement refers to mixing a certain amount of foam into conventional cement slurry to form a solid, liquid, and gas three-phase multi-phase system with high dispersibility. Foam cement cementing is mainly to reduce the density of cement slurry, thereby reducing the liquid column pressure of the cement slurry section in the annulus, to solve the problem of cementing leakage in the low-pressure and easy-to-leak oil layer, and to protect the oil layer. Although foamed cement slurries have been used in the construction industry more than 50 years ago, the foamed cement slurries for oil wells were first proposed by Aldrich and Mitchell in the U...

Claims

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Application Information

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IPC IPC(8): E21B33/13B28C5/00B28C7/04
CPCB28C5/386B28C5/388
Inventor 张明昌刘建周仕明
Owner CHINA PETROLEUM & CHEM CORP
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