High temperature resistant well cementation cement paste used for steam injection thermal production well

Abstract

The invention provides high temperature resistant well cementation cement paste used for a steam injection thermal production well, and the cement paste comprises the following components by weight: 100 parts of high temperature resistant cement, 30-40 parts of a high temperature stabilizer, 0.5-1.2 parts of a thickening time control agent, 2.5-4.5 parts of an oilwell cement fluid loss agent, 0.02-0.15 part of an anti sedimentation agent, 0.02-0.15 part of a defoaming agent, and 45-100 parts of water. The high temperature resistant well cementation cement paste can effectively solve the problems of quick reduction in strength, fast rising in permeability and the like of well cementation cement paste systems in the prior art, can improve the thermal stability, reduces the possibility of channeling and casing damage, can make oilwells long-term sealed, improves production efficiency, and reduces production cost.

Description

technical field [0001] The invention relates to a high-temperature-resistant well cementing cement slurry used for steam injection thermal recovery wells, and belongs to the technical field of petroleum exploitation. Background technique [0002] About half of the world's proven oil reserves are heavy oil, and our country is also quite rich in heavy oil resources. A large number of heavy oil reservoirs have been discovered in oil fields such as Liaohe, Shengli, Tuha, and Karamay, and the output is close to 10% to 15% of the production capacity of each oil field. %, of which Liaohe Oilfield's annual output of heavy oil accounts for more than 60% of its total annual oil and gas output. In addition, from the perspective of the distribution pattern of my country's land oil and gas resources, the old eastern region, as the main production area of ​​domestic oil resources, has a high degree of exploration in shallow and middle-deep layers, and a low degree of exploration in deep a...

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Problems solved by technology

In addition, the field application of thermal recovery wells shows that during thermal recovery, the downhole casing and cement sheath have to withstand high temperatures above 200°C, and the temperature is cycled between high and low, resulting in cement stones under high temperature conditions. If the rate increases, the cement quality of the first and second interfaces will decrease under the cyclic thermal stress, which will lead to the failure of the interlayer seal, the formation of casing damage and channeling, and ultimately shorten the production cycle of the oil well and increase the cost

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