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Low-density micro-expansion early-strength channeling-preventive oil well cement slurry and preparation method thereof

An oil well cement slurry and micro-expansion technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of fragility, reduced compressive strength of cement stone, easy delamination, etc., and achieve good flow performance, strong Anti-channeling performance, the effect of less free water

Inactive Publication Date: 2015-11-18
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, researchers mainly use floating beads as cement lightening agents, but these low-density cements have disadvantages such as fragility and easy delamination.
However, the cement slurry prepared by using fly ash, bentonite and other lightening materials and increasing the water-cement ratio will reduce the compactness of the cement slurry, which will lead to a decrease in the compressive strength of the cement stone and an increase in permeability, making it difficult to meet the solid well quality

Method used

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  • Low-density micro-expansion early-strength channeling-preventive oil well cement slurry and preparation method thereof
  • Low-density micro-expansion early-strength channeling-preventive oil well cement slurry and preparation method thereof
  • Low-density micro-expansion early-strength channeling-preventive oil well cement slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1, the formula of oil well cement slurry A is: 100 parts of oil well cement, 8 parts of hollow glass beads, 5 parts of ultra-fine cement, 5 parts of microsilica, 3 parts of early strength agent, 3 parts of expansion agent, and fluid loss agent 4 parts, 8 parts of styrene butadiene latex anti-channeling agent, 0.2 part of dispersant, 0.3 part of defoamer, and 60 parts of water. The density of cement slurry is 1.55g / cm3.

Embodiment 2

[0032] In Example 2, the formula of oil well cement slurry B is: 100 parts of oil well cement, 16 parts of hollow glass beads, 10 parts of ultra-fine cement, 8 parts of microsilica, 4 parts of early strength agent, 4 parts of expansion agent, and fluid loss agent 6 parts, 10 parts of styrene butadiene latex anti-channeling agent, 0.4 parts of dispersant, 0.5 parts of defoamer, and 75 parts of water. The density of cement slurry is 1.40g / cm3.

Embodiment 3

[0033] Example 3, the formula of oil well cement slurry C is: 100 parts of oil well cement, 30 parts of hollow glass beads, 15 parts of ultra-fine cement, 9 parts of microsilica, 4 parts of early strength agent, 5 parts of expansion agent, and fluid loss agent 8 parts, 12 parts of styrene-butadiene latex anti-channeling agent, 0.5 parts of dispersant, 0.5 parts of defoaming agent, and 100 parts of water. The density of the cement slurry is 1.25g / cm3.

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Abstract

The invention discloses low-density micro-expansion early-strength channeling-preventive oil well cement slurry and a preparation method thereof. The density of the cement slurry is 1.05-1.55g / cm<3> and can be adjusted. The cement slurry is composed of oil well cement, lightening agents, stabilizing agents, early-strength agents, expansion agents, styrene-butadiene latex channeling-preventive agents, fluid loss agents, dispersing agents, defoaming agents and water, wherein the lightening agents are hollow glass micro beads, the stabilizing agent are superfine cement and micro silicone. The cement slurry is little in system free water, small in fluid loss amount, high in channeling-preventive performance, micro-expansion performance and mobility, good in slurry stability and adjustable in thickening time, has the advantages of being fast in low-temperature strength development, capable of preventing gas channeling and the like, and can be used for low-pressure leakage zones and low-pressure oil and gas reservoirs, and medium and low temperature region well cementation construction.

Description

Technical field [0001] The invention relates to an oil well cement slurry and a preparation method thereof, in particular to a low-density, micro-expansion, early-strength, anti-channeling oil well cement slurry and a preparation method thereof, and is particularly suitable for cement slurry for low pressure, easy leakage and easy channeling formations. Background technique [0002] For low-pressure lost zone and low-pressure oil and gas zone well cementing operations, low-density and early-strength anti-channeling cement slurry is required to complete. At present, researchers mainly use floating beads as cement lightening agents, but these low-density cements have shortcomings such as fragility and easy delamination. However, the cement slurry prepared by using fly ash, bentonite and other lightening materials, coupled with the method of increasing the water-cement ratio, will reduce the compactness of the cement slurry, which will lead to a decrease in the compressive strength ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/487C09K8/473C09K8/493
CPCC09K8/487C09K8/473C09K8/493
Inventor 齐奔付家文孙勤亮刘文明于倩倩林志辉石伟
Owner CNPC BOHAI DRILLING ENG
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