Self-degradable leaking-prevention and stoppage material and preparation method thereof, self-degradable leaking-prevention and stoppage product and application thereof

Abstract

The invention provides a self-degradable leaking-prevention and stoppage material and a preparation method thereof, a self-degradable leaking-prevention and stoppage product and an application thereof. The self-degradable leaking-prevention and stoppage material comprises the following raw materials in mass by part: 95-105 parts of water, 6-20 parts of an acrylic acid monomer, 12-20 parts of water-soluble starch, 0.5-1.0 parts of persulfate, and 0.2-0.5 parts of a silane coupling agent. In the above raw materials, the acrylic acid monomer is taken as a polymeric monomer, sulfate is taken as an initiator for initiating polymerization of acrylic acid, a silane coupling agent is used for coupling water-soluble starch and the acrylic acid monomer, at the same time, by controlling the usage amount of the raw materials in the above ratio scope, synergism between raw materials is optimized, and the self-degradable leaking-prevention and stoppage material has excellent permeability restoration ratio and self-degradation performance.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a self-degradation anti-leakage plugging material and a preparation method thereof, a self-degradation anti-leakage plugging product and applications thereof. Background technique [0002] At present, most of the onshore oil fields in my country have entered the middle and later stages of development, and the pressure of oil and gas wells has been decreasing year by year, and the leakage of workover fluid often occurs, which leads to the following consequences: ①The working cycle of the workover fluid cannot be established, and the workover operation cannot be carried out normally; ② The workover time is prolonged and the workover cost is increased; ③The sand washing is not complete, and the oil well operation cycle is short; ④The liquid drainage time is long after the well is opened, and the production recovery rate is low. [0003] At present, there are mainly the following ...

AI Technical Summary

Problems solved by technology

Its disadvantages are: there is not only the matching problem of particle diameter and formation pores, but also acidizing and plugging removal after workover operations

The disadvantage is that the density of the inorganic salt solution is relatively high, and leakage is more likely to occur

And it is also difficult to increase the viscosity of the brine

[0010] The above leak prevention and plugging methods all have problems such as narrow scope of application and inability to adapt to the coexistence of multiple leaks.

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