Temporary blocking gel for low-pressure oil-gas well and preparation method thereof

Abstract

The invention relates to the technical field of temporary blocking gel for an oil-gas field, and provides temporary blocking gel for a low-pressure oil-gas well and a preparation method thereof. The temporary blocking gel for a low-pressure oil-gas well comprises the following raw materials in percentage by weight: 0.25-0.35% of polyacrylamide, 0.2-0.25% of oxidizer, 0.2-0.3% of reducer, 0.1-0.3% of gel breaker and the balance of water. The preparation method comprises the following steps: after swelling, adding the oxidizer, the reducer and the gel breaker; and further stirring to obtain the temporary blocking gel for a low-pressure oil-gas well. The temporary blocking gel provided by the invention is low in cost, simple to prepare, safe and convenient in construction and wide in application range; after gel forming, the temporary blocking gel is high in strength favorable in blocking effect, and can not cause leakage of kill fluid; after gel forming, the temporary blocking gel is favorable in viscosity and high in strength, simultaneously prevents blocking agent from entering a non-target layer, and can not cause pollution to an oil layer; and after gel breaking, the temporary blocking gel can realize clean and thorough flowback, can not cause safety accidents, and can not pollute the oil layer, thereby providing a guarantee for implementation of further work.

Description

technical field [0001] The invention relates to the technical field of oil and gas field temporary plugging gel, and relates to a low-pressure oil and gas well temporary plugging gel and a preparation method thereof. Background technique [0002] At present, the research on temporary plugging agents and their properties at home and abroad is also extensive. For the operation of various oil and water wells, temporary plugging agent technologies have been developed and applied at home and abroad, and acid-soluble temporary plugging agents, oil-soluble Temporary plugging agent and water-soluble temporary plugging agent. [0003] The main components of the oil-soluble temporary plugging agent are oil-soluble petroleum resin, sulfonated asphalt, oil-soluble polymer and surfactant, etc. When the oil-soluble temporary plugging agent is squeezed into the vicinity of the wellbore and near the wellbore, under the action of formation pressure and temperature, It becomes soft, plugs th...

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a low-pressure oil and gas well temporary plugging gel and its preparation method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem in the workover process. Problems of killing fluid loss and temporary plugging agent seriously polluting oil layers during water plugging and channeling