Light-bead leakage-proof cement paste for well cementation and manufacturing technology

Abstract

The invention relates to light-bead leakage-proof cement paste for well cementation and a manufacturing technology; the light-bead leakage-proof cement paste is characterized in that the light-bead leakage-proof cement paste is compounded by G-grade oil-well cement and light beads according to a weigh proportion, wherein the G-grade oil-well cement accounts for 60-90 parts, the light beads accounts for 10-40 pats and water accounts for 65-95 parts. The light-bead leakage-proof cement paste aims at overcoming the defects of the prior art. The volume of the light-bead leakage-proof cement paste system provided by the invention obviously changes along with the change of pressure so that the system density of the cement paste can be effectively reduced, and the cementation quality of cement stones can also be increased; when leakage happens, the light-bead leakage-proof cement paste has the effects of leakage slowdown and leaking stoppage.

Description

technical field [0001] The invention relates to a light bead anti-leakage cement slurry for well cementing and a preparation process thereof. Background technique [0002] The existing cement slurry system will cause serious leakage, low return of cement, poor sealing quality of some oil layers or leakage of oil layers. The return is not high enough, but if the density of the cement slurry system is too low, the quality of cement cementation will deteriorate, causing quality problems in well cementing; the main problems in cementing with ordinary cement slurry systems are: [0003] 1. The cement slurry system of ordinary sealing oil layer has a high density, all of which are greater than 1.85 g / cm 3 , easy to leak out formations with low pressure bearing capacity; [0004] 2. The volume of ordinary low-density cement slurry system does not change significantly with pressure, and cannot effectively slow down and prevent leakage during the cementing process; [0005] 3. Fly...

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Problems solved by technology

[0002] The existing cement slurry system will cause serious leakage, low return of cement, poor sealing quality of some oil layers or leakage of oil layers. The return is not high enough, but if the density of the cement slurry system is too low, the quality of cement cementation will deteriorate, causing quality problems in well cementing; the main problems in cementing with ordinary cement slurry systems are:

[0003] 1. The cement slurry system of ordinary sealing oil layer has a high density, all of which are greater than 1.85 g / cm 3 , easy to leak out formations with low pressure bearing capacity;

[0004] 2. The volume of ordinary low-density cement slurry system does not change significantly with pressure, and cannot effectively slow down and prevent leakage during the cementing process;

[0005] 3. Fly ash low-density cement paste has poor stability, and the density is generally 1.45 g / cm 3 About, the thickening time is more than 350min, and the water separation is about 10%, which is prone to stratification

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