High-temperature-resistant elastic well cementing cement paste system applied to thickened oil thermal production well and preparation method of high-temperature-resistant elastic well cementing cement paste system

Abstract

The invention provides high-temperature-resistant elastic cement paste applied to thermal production well cementing. The cement paste is prepared from the following raw materials in parts by weight: 100 parts of oil well cement, 35-40 parts of a high-temperature stabilizer, 4-6 parts of a fluid loss agent, 2.4-3.6 parts of a dispersant, 3-6 parts of a reinforcing agent, 0.3-0.5 part of a retarder,0.2-0.6 part of high-temperature-resistant fiber, 4-6 parts of a high-temperature-resistant inorganic flexibilizer, 2-4 parts of a high-temperature-resistant organic flexibilizer, 0-26 parts of a lightening admixture and 52-78 parts of fresh water. According to the high-temperature-resistant elastic cement paste, the high-temperature stabilizer, the high-temperature-resistant fiber and compound flexibilizers of high-temperature-resistant flexibilizing materials are added into the cement paste system, so that formed hardened cement paste can maintain high compression strength under the long-term action of high temperature, and also can maintain high elasticity under the actions of periodic high temperature and low temperature of the thermal production well.

Description

technical field [0001] The invention relates to a high temperature resistant elastic well cementing cement slurry system for heavy oil thermal recovery wells, belonging to the technical field of oil and gas field development. Background technique [0002] Heavy oil occupies a large proportion of the world's oil and gas resources. my country's onshore heavy oil resources account for more than 20% of the total oil resources. At present, more than 70 heavy oil fields have been discovered in 12 basins, with proven and controlled reserves of about 4 billion tons. At present, heavy oil production at home and abroad is generally carried out by steam injection, that is, a certain amount of steam is injected into the oil layer, and the well is shut down for a period of time and then opened for recovery. Generally, each well can perform 5 to 8 cycles of steam huff and puff operations. The downhole steam temperature is usually as high as 300-350°C during steam injection production, an...

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Problems solved by technology

Such as Chinese patent document CN104059622A has announced a kind of high temperature resistant cementing cement slurry that is used for steam injection thermal recovery well, the high temperature resistant cement used in this cement slurry system is aluminate cement, although this system can solve the cementing slurry system in high temperature The problem of lower strength, but did not mention the elasticity of cement stone under high temperature

Chinese patent document CN103803823B discloses a high-temperature-resistant cement and its preparation method. The cement is composed of aluminate cement clinker, phosphate slag, ceramic fiber, rubber powder, etc. The cement has excellent high-temperature performance, but the added Rubber powder, a tough material, is easy to decompose above 300°C, so the cement stone formed by this cement cannot guarantee good elasticity at high temperatures

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