Tenacity anti-fluid-channeling cement slurry for solid expansion pipe fixed well

Abstract

The invention discloses tenacity anti-fluid-channeling cement slurry for a solid expansion pipe fixed well. The tenacity anti-fluid-channeling cement slurry comprises the following components: 100g of a mixture of G-level oil well cement or G-level cement and silica powder ( when the static temperature of the bottom of the well is more than 110 DEG C), 2.5g-4.2 g of a delaying coagulating agent, 8g-11g of a fluid loss agent, 1g-1.2g of a dispersing agent, 0.5g-0.8g of a toughening agent, 3g-5g of an anti-fluid-channeling agent, 0.1g-0.3g of an antifoaming agent, and 37.3g-41g of tap water, wherein the toughening agent is formed by mixing fiberglass the length of which is 0.3-2mm and polyamide fiber the length of which is 3-5mm according to the mass ratio of 2:1, and the other matters are sold in a market. The cement slurry provided by the invention has the advantages that the cement slurry has the strong sealing property and good comprehensive property, can ensure that a solid expansion pipe is safely and reliably expanded and improve the sealing quality of a cement ring of the solid expansion pipe, and supplements the defects and disadvantages of the prior art.

Description

technical field [0001] The invention relates to a cement slurry for well cementing of solid expansion pipes, which belongs to a special cement slurry used in oil and gas well cementing engineering. Background technique [0002] Most of the production casings of onshore oil wells in my country are Φ177.8mm or smaller casings. When sidetracking a slim hole from an old wellbore, the hole size is small and the annular space is small. It is difficult to run a suitable production string, which affects It is difficult to ensure the effective sealing quality of cementing in perforating, testing, production management and workover operations. Therefore, solid expansion tube cementing can be used to effectively expand the inner diameter of the production casing to facilitate operations such as perforation, testing, production management, and well workover. The cement slurry which can adapt to small clearance annulus cementing and has strong anti-gas channeling and impact ability in th...

AI Technical Summary

Problems solved by technology

However, due to the high gas channeling potential and the fragility of the thin cement sheath, the delayed setting cement slurry with fast strength development needs to be further studied in order to ensure the cementing of the solid expansion tube. The safety of construction work and the long-term sealing quality of the cement sheath