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A foamed cement slurry preparation device and its application

A cement slurry and foam technology, applied in the field of foam cement slurry preparation equipment, can solve the problems of laboratory research that hinders the physical foaming of foam cement slurry, cannot accurately evaluate the performance of foam cement slurry, and does not fully simulate the field cementing construction process.

Active Publication Date: 2016-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fill the cement and foaming liquid in the mixing slurry cup with nitrogen and stir to form foamed cement slurry. After the stirring is completed, the pressure must be released and the density of the foamed cement slurry must be measured under normal pressure and the laboratory for subsequent cement stone compressive strength and permeability. required modules, the whole process cannot be carried out under pressure, and the on-site cementing construction process has not been fully simulated
[0008] During the construction of on-site foam cementing and cementing, due to the complex downhole conditions, there is a certain pressure in the flow of foam cement slurry, and the volume and density changes of foam cement slurry are affected by pressure. Therefore, the foam under the above normal pressure conditions The indoor research and testing of cement slurry cannot accurately evaluate the performance of foamed cement slurry in the actual application process, which seriously hinders the laboratory research on the physical foaming of foamed cement slurry, and further affects the application of physical foaming technology in oilfield low-density cementing technology. field application

Method used

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  • A foamed cement slurry preparation device and its application
  • A foamed cement slurry preparation device and its application

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0082] The density of 650mL is 1.88g / cm 3 The cement slurry and 10mL of foaming liquid are fed into the mixing cylinder 11 in the foamed cement slurry batching circulation system, and the test pressure is 0.5-1.0 MPa. The cycle time of the batching circulation system is 3 minutes, and the cycle time of the sampling circulation system is 2 minutes. After the sampling cycle is completed, the sampler 27 is removed for subsequent detection and evaluation tests, and the results are shown in Table 1.

example 2

[0084] The density of 650mL is 1.88g / cm 3 The cement slurry and 15mL of foaming liquid are fed into the mixing tank 11 in the foamed cement slurry batching circulation system, and the test pressure is 0.5-1.0 MPa. The cycle time of the batching circulation system is 3 minutes, and the cycle time of the sampling circulation system is 2 minutes. After the sampling cycle is completed, the sampler 27 is removed for subsequent detection and evaluation tests, and the results are shown in Table 1.

example 3

[0086] The density of 650mL is 1.88g / cm 3 The cement slurry and 10mL of foaming liquid are fed into the mixing cylinder 11 in the foamed cement slurry batching circulation system, and the test pressure is 0.5-1.0 MPa. The cycle time of the batching circulation system is 5 minutes, and the cycle time of the sampling circulation system is 3 minutes. After the sampling cycle is completed, the sampler 42 is removed for subsequent detection and evaluation tests, and the results are shown in Table 1.

[0087] Table 1

[0088]

[0089] As can be seen from the above examples, in the process of preparing foamed cement slurry using the foamed cement slurry preparation device of the present invention, the density of the foamed cement slurry can be adjusted by changing the foaming liquid percentage and cycle time. The higher the foaming liquid percentage, the longer the cycle time. The longer it is, the lower the density of the foamed cement paste is; samples are taken to determine t...

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Abstract

The invention relates to a foam cement paste preparation device. The device mainly comprises a burdening circulation system and a sampling circulation system, wherein the burdening circulation system is composed of a circulation pipeline, a mixing cylinder and a piston cylinder; the sampling circulation system is composed of a sampler, the mixing cylinder and the piston cylinder by a circulation pipeline. By utilizing the device, the whole processes of preparation and sampling of the foam cement paste are carried out under the condition of pressure, cement paste and a foaming additive are mixed circularly and uniformly in a nitrogen feeding mode in the burdening circulation system, and the foam cement paste of a film micro air bubble spherical structure is formed; the density of the foam cement paste is regulated by regulating the nitrogen feeding amount and the circulation time of the burdening circulation system; the accurate evaluation on change rules of parameters of the density of the foam cement paste, and the strength, the permeability and the like of foam set cement by the burdening circulation system and the sampling circulation system has an instructional effect on popularizing the application of the foam cement paste on site.

Description

technical field [0001] The invention belongs to the technical field of low-density well cementing in oil fields, and relates to a foam cement slurry preparation device and an application thereof which circulates and samples foam cement slurry under pressurized and airtight conditions. 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, in China, the research on the use of foam cement for well cementing construction began in 1985, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28C5/16G01N1/38G01N1/10
CPCB28C5/16G01N1/10G01N1/38
Inventor 刘建刘伟丁士东桑来玉周仕明张林海汪晓静刘学鹏陶谦周体秋
Owner CHINA PETROLEUM & CHEM CORP