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A preparation method and device for foam cement slurry and its application

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: 2017-06-13
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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  • A preparation method and device for foam cement slurry and its application
  • A preparation method and device for foam cement slurry and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] In the construction of foam cementing on site, according to the needs of the site operation, the foam cement slurry density ρ 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 a foamed grout with the above target density, first pass the grout density ρ 2 Detection module 10 measures cement-based slurry density 1.88g / cm 3 , to control the foam injection pressure P 0 =0.4MPa, through the first flow F 1 The control module 8 pre-sets the first flow rate F of the foam cement slurry equipment outlet 1 =0.8m 3 / min, through the second flow F 2 Control module 9 passes formula I::ρ 1 = ρ 2 *F 2 / F 1 Calculate and adjust the second flow rate F 2 =0.6m 3 / min; the target foam cement slurry density is 1.4g / cm 3 .

Embodiment 2

[0081] In the construction of foam cementing on site, according to the needs of the site operation, the foam cement slurry density ρ 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 a foamed grout with the above target density, first pass the grout density ρ 2 Detection module 10 measures cement-based slurry density 1.88g / cm 3 , to control the foam injection pressure P 0 =0.4MPa, through the first flow F 1 The control module 8 pre-sets the first flow rate F of the foam cement slurry equipment outlet 1 =0.8m 3 / min, through the second flow F 2 Control module 9 passes formula I::ρ 1 = ρ 2 *F 2 / F 1 Calculate and adjust the second flow rate F 2 =0.4m 3 / min; that is, the target foam cement slurry density is 1.0g / cm 3 .

Embodiment 3

[0084] In the construction of foam cementing on site, according to the needs of the site operation, the foam cement slurry density ρ 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 a foamed grout with the above target density, first pass the grout density ρ 2 Detection module 10 measures cement-based slurry density 1.6g / cm 3 , to control the foam injection pressure P 0 =0.4MPa, through the first flow F 1 8 control modules pre-set the first flow F of the foam cement slurry equipment outlet 1 =0.8m 3 / min, through the second flow F 2 Control module 9 passes formula I::ρ 1 = ρ 2 *F 2 / F 1 Calculate and adjust the second flow rate F 2 =0.6m 3 / min; that is, the target foam cement slurry density is 1.2g / cm 3 .

[0086] Table 1

[0087]

[0088] Through this inventive method, the displacement of the filling pump can be adjusted by stabilizing the outlet displacement of the cement pump. Wh...

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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 foamed 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 well cementing in oil fields. Background technique [0002] Foamed cement refers to a multiphase system in which a certain amount of foam is mixed into conventional cement slurry to form three phases of solid, liquid and gas and has a high degree of dispersion. Foam cement cementing is mainly to reduce the density of cement slurry, thereby reducing the liquid column pressure of the annular cement slurry section, so as to solve the problem of cementing leakage in low-pressure and easy-to-leak oil layers, and to protect the oil layers. Although foam cement slurry has been used in the construction industry more than 50 years ago, oil well foam cement slurry was first proposed by Aldrich and Mit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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