Heavy oil thermal recovery high-temperature channeling blocking composite plugging-adjusting liquid and preparing method and application thereof

Abstract

The invention discloses heavy oil thermal recovery high-temperature channeling blocking composite plugging-adjusting liquid and a preparing method and application thereof. The components of the liquid comprise, by weight, 1000 parts of water, 200-500 parts of water glass, 10-30 parts of flyash, 1-10 parts of lignosulfonate, 10-20 parts of modified starch, 0.3-0.5 part of foaming agent and 0.3-0.5 part of foam stabilizer. In-well fluid of the heavy oil thermal recovery high-temperature channeling blocking composite plugging-adjusting liquid is pure liquid, mobility and injection efficiency are good, and the liquid has small harm on a stratum; curing time is controllable, and can be adjusted according to a construction situation; the liquid has a strong high-temperature resistance, and can endure temperature of 300 DEG C or above; validity period for blocking is long, and can last for more than several years, thus effectively avoiding repetitive operation on the same channeling layer; after blockage, residual resistance factor remains large, and thus blockage of the channeling layer and a water yield layer is effectively achieved.

Description

technical field [0001] The invention relates to the field of heavy oil thermal recovery in oilfields, in particular to a heavy oil thermal recovery fluid for plugging adjustment. Background technique [0002] Thermal recovery technologies are generally used in the process of oil reservoir development, including steam huff and puff, steam flooding, etc. In oil field production operations, due to water channeling and steam channeling problems, a large number of oil wells have been shut down or have low production and low efficiency, which has seriously affected the recovery rate and development benefits, and has become a major problem plaguing major oil fields. Subsequently, during steam injection production, the heterogeneity of the reservoir leads to easy occurrence of steam channeling and steam overburden, and it is necessary to seal off the near wellbore zone and the far wellbore zone. [0003] Among the current plugging materials: foam plugging materials have problems su...

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Problems solved by technology

[0003] Among the current plugging materials: foam plugging materials have problems such as short plugging time, complicated construction technology, high gas injection cost, unstable foam, and high injection pressure; inorganic solid particle plugging materials have poor injectability and cannot enter the formation In the deep part, the plugging distance is short, and the plugging is non-selective permanent plugging, which causes great damage; polymer plugging agents have problems such as affecting oil well production, large formation damage, and are easily restricted by formation conditions; resin plugging agents Due to the high cost of leaking agent, the use has also been restricted

[0004] In China, the composite plugging control technology has been studied in heavy oil thermal recovery wells, such as Shengli Oilfield, Liaohe Oilfield, and Xinjiang Oilfield, and has achieved good results. It mainly solves the problem of edge and bottom water flooding and well However, the scope of its research is only for some specific phenomena, and it does not have a wide range of adaptability. The formed plugging zone has poor pressure resistance, short effective period, and insufficient temperature resistance, so it cannot be well adapted to steam Throughput job needs

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