High temperature resistant cement mortar

Abstract

The invention relates to high-temperature-resistance cement slurry, which relates to the cement slurry used by oil drilling and cementing technical field, solving the problem of bad high-temperature-resistance performance of prior cement slurry. Components and proportions of the high-temperature-resistance cement slurry of the invention are as follows by weight portions: 100 portion of cement, 55-65 portion of water, 6-15 portion of filtrate loss reducer, 4.8-7.2 portion of retarder, 20-40 portion of drag reduction agent, 3-5 portion of filler and 1-3 portion of stabilizer; wherein, the filtrate loss reducer is high molecular polymer; the retarder is lignin inorganic salt; the drag reduction agent is sulphonated acetone-formaldehyde polymer; the filler is silicon dioxide with concentration more than 95 percent; the stabilizer is polyester fiber. The high-temperature-resistance cement slurry has the advantages of strong high-temperature resistance, low filtrate loss water, good slurry stability, strong anti-hydrosphere channeling ability and strong compressive strength of cement paste which can improve construction security for cementing high-deep wells, reduce damage of filtrate of the cement slurry to formation, protect oil and gas formation and can be popularized and applied for wells in complex blocks.

Description

technical field [0001] The invention relates to a cement slurry used in the technical field of petroleum drilling and well cementing, and belongs to a cement slurry with high temperature resistance. Background technique [0002] Cementing is an important link in oil well construction. The quality of cementing directly affects the quality of the well's continuous drilling and subsequent completion, oil production, workover and other operations. The cementing operation is divided into casing and cement injection. Cement slurry is used to fill the annular space between casing and borehole, and its performance directly affects the quality of cementing. Since the depth of the deep exploration well is more than 5500m, the temperature at the bottom of the well will reach 220-240°C, and the circulation temperature at the bottom of the well will reach 170-180°C. In terms of high temperature environment. In a high temperature environment, the properties of the cement slurry become ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of high temperature resistant cement slurry in order to solve the problem of insufficient high temperature resistance performance of the existing cement slurry