A kind of fly ash low density cement slurry
A technology for cement slurry and fly ash, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of large shrinkage of cement stone and high density of cement slurry, so as to reduce shrinkage and prevent cement from falling back to the standard. Effect
Active Publication Date: 2016-08-17
CHINA UNITED COALBED METHANE NAT ENGRES CENT +1
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[0003] The invention provides a fly ash low-density cement slurry to solve the defects of high cement slurry density and large shrinkage of cement stone in the prior art
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[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.
[0027] The core idea of the present invention is to add fly ash and other additives to the G-grade oil well cement to reduce the density of the prepared cement slurry while ensuring the strength of the cement stone and reducing the shrinkage of the cement stone.
[0028] Fly ash low density cement slurry of the present invention comprises:
[0029] 1 unit mass of G-grade oil well cement, 0.35-0.55 unit mass of fly ash, 0.7-0.8 unit mass of water, 0.05 unit mass of micro-silicon, 0.002-0.0045 unit mass of dispersant, 0.02-0.06 unit mass of early strengthening agent and 0.01 to 0.012 unit mass of fluid loss reducing agent; and the consumption of the water, the dispersant and the early strengthening agent increase with the increase of the amount of the fly ash; and the density of...
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Abstract
The invention discloses fly ash low-density grout, which comprises 1 unit mass of G-grade oil well cement, 0.35-0.55 unit mass of fly ash, 0.7-0.8 unit mass of water, 0.05 unit mass of micro silicon, 0.002-0.0045 unit mass of a dispersant, 0.02-0.06 unit mass of an accelerator and 0.01-0.12 unit mass of a fluid loss additive; in addition, the use amounts of the water, the dispersant and the accelerator is are increased along with the increment of the use amount of the fly ash; moreover, the density of the grout is 1.66-1.75 g / cm<3>, and the ratio of the water-to-cement ratio is 0.52. The fly ash low-density grout is lower in density, not only ensures the strength of cement, but also reduces the shrinkage of the cement, and avoids the problems that the climbing height of the cement during cementing is unqualified, the strength of the second cemented surface is low, and the dehydration of the grout is serious.
Description
technical field [0001] The invention relates to the drilling field in the development of coal bed methane, in particular to a fly ash cement slurry. Background technique [0002] In order to ensure the low-cost and high-efficiency exploitation of coalbed methane, in the cementing of coalbed methane wells, conventional density pure slurry system cement slurry with a density of 1.80 g / cm3 to 1.85 g / cubic cm or a formula system with a small amount of coagulant is usually used Grout. These two cement slurry systems have the defects of high cement slurry density and large shrinkage of cement stone in actual construction, which often lead to problems such as high cement return height not up to standard, low strength of the second cemented surface, and serious water loss of cement slurry in well cementing. Contents of the invention [0003] The invention provides a fly ash low-density cement slurry to solve the defects of high cement slurry density and large shrinkage of cement ...
Claims
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IPC IPC(8): C09K8/467
CPCC04B28/00C09K8/487C04B18/08
Inventor 敬东梁为徐博瑞熊琼姣
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT