Blocking remover system and blocking removal method

Abstract

The invention discloses a blocking remover system and a blocking removal method, and relates to the technical field of oil and gas production. The blocking remover system comprises a pre-acid and a main body acid, wherein the pre-acid comprises the following components in percentage by weight: 8-12% of hydrochloric acid, 0.2-0.6% of a first clay stabilizer, 0.5-1% of a first corrosion inhibitor, 0.5-1% of a first iron ion stabilizer, 1-2% of a first water block removing agent, 0.1-0.6% of a first strong oxidant and the balance of water; the main body acid comprises the following components in percentage by weight: 8%-12% of hydrochloric acid, 1%-3% of hydrofluoric acid or fluoboric acid, 0.5%-1% of a second corrosion inhibitor, 0.5%-1% of a second iron ion stabilizer, 1%-2% of a second water lock removing agent, 0.2%-0.6% of a second clay stabilizer, 0.1%-0.6% of a second strong oxidant and the balance of water. The blocking remover system achieves the purpose of removing composite blocking of well entering fluid blocking and muddy blocking.

Description

technical field [0001] The embodiments of the present invention relate to the field of oil and gas production, and in particular, to a plug removing agent system and a plug removing method. Background technique [0002] The Sebei gas field is located in the three lakes area of ​​Taijiner Lake, Senie Lake and Dabxun Lake in the Qaidam Basin of Qinghai Province. It mainly includes three gas fields of Sebei No. 1, Sebei No. 2 and Tainan. Sandstone gas reservoir. Affected by the low pressure of the reservoir, the intensified water production and sand production in the Sebei Gas Field, the shut-down wells appeared one after another with clogging of clay migration, contamination of the well-entry fluid, and deterioration of the physical properties of the reservoir, which affected the implementation of measures to increase and stabilize production in the oil and gas field. The problem of unplugging the well needs to be solved urgently. [0003] For the blockage of reservoir shale...

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Problems solved by technology

[0005] There is no public report on the clogging caused by the leakage of xanthan gum in well killing fluid, sand washing fluid and sand control fluid, and the solution to the composite clogging caused by the leakage of biological rubber such as xanthan gum and guar gum in reservoir mud and well fluid There is no public report on plugging agent and plugging removal method

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