Efficient erosion-resistant anti-gas-channeling cement paste system

Abstract

The invention discloses an efficient erosion-resistant anti-gas-channeling cement paste system. The efficient erosion-resistant anti-gas-channeling cement paste system is characterized by being prepared from the following raw materials in parts by weight: 60-80 parts of erosion-resistant anti-gas-channeling cement, 2-4 parts of butadiene-styrene latex or polyimide latex or silicon dioxide / water mixed suspension, 0.2-2 parts of AMPS polymer fluid loss control agent, 0.05-0.2 part of polycarboxylic acid ether ester dispersing agent, 0.1-2 parts of chlorine-free aluminate complex accelerator, 0.1-0.5 part of organic phosphate retarder, 0.1-0.2 part of organic silicon defoaming agent and 20-30 parts of distilled water. According to the invention, the special functional materials are doped, so that the set cement is always kept in a proper alkaline environment, and a liquid-phase acidic medium is prevented from entering the set cement; the doped special functional materials ensure that the set cement has favorable mechanical properties; and the compactness of the set cement is increased, the toughness of the set cement is improved, and the bonding property and the sealing property between a cement sheath and a stratum are enhanced.

Description

technical field [0001] The invention relates to the field of cement admixtures for oil and gas well cementing, in particular to a high-efficiency anti-erosion and anti-gas channeling cement slurry system. Background technique [0002] Acid gases such as carbon dioxide and hydrogen sulfide are present in formations as associated gases in oil and gas production or as components of formation water. With the deepening of exploration and development, more and more acid gas-rich reservoirs have been discovered. As we all know, the harm and influence caused by the corrosion of these acid gases are huge. They will corrode the cement sheath of oil and gas wells, thereby affecting its sealing effect. When the oil, gas, and water sealing barriers in the well are damaged, the acidic medium will further corrode the casing, thereby affecting the life of the oil and gas well. Aiming at the corrosion of cement stone by acid gas, researches began at home and abroad as early as the mid-1980...

AI Technical Summary

Problems solved by technology

There are also corresponding SPE expansion agents and latex anti-air channeling agents in China, but these materials often have a single effect and the effect is not ideal

[0004] Although domestic and foreign research on the anti-corrosion and anti-gas channeling of oil well cement has achieved certain results, there are still some problems, and there is almost no research on simultaneously anti-corrosion and anti-gas channeling cement slurry

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