High-strength multifunctional plugging agent

Abstract

The invention discloses a high-strength multifunctional plugging agent. The plugging agent comprises, by mass, 100 parts of a structural forming agent, 0.001-15 parts of a curing agent, 0.001-10 partsof an interface adhesion agent, 0.001-200 parts of a nano filler and 0.001-30 parts of a diluent, wherein the structural forming agent comprises one or two of unsaturated polyester and vinyl resin; the curing agent comprises one or more of peroxide, persulfide and azo compounds; the interface adhesion agent comprises vinyl triethoxy silane or vinyl trimethoxy silane; the nano filler comprises oneor more of nanoscale or micron-scale carbonate, silicate and sulfate. During use, the structural forming agent, the curing agent, the interface adhesion agent, the nano filler and the diluent are mixed and react to generate liquid gel; the liquid gel is injected to a target plugged zone position and is solidified to form the high-strength multifunctional plugging agent. The plugging agent is stable in performance, good in residence property, high in adhesion force, high in elasticity modulus and high in compressive strength, and has a wide application range and good effects in oil and gas field drilling and production operation.

Description

technical field

[0001] The invention belongs to the technical field of oilfield chemistry, and relates to a high-strength and multifunctional plugging agent. Background technique

[0002] Lost circulation is an inevitable problem in the exploitation of oil and gas fields, which seriously hinders the smooth progress of oil and gas field development. Due to the special and complex geological conditions and strong injection and strong production, damage and leakage of oil and water wells are very common, and the problem of well condition deterioration is becoming more and more serious, especially in some old wells, due to the long service life of the casing and the cementing cement is not completely sealed. The solid casing is very easy to be perforated due to corrosion or mechanical friction in the free section of the casing. In addition, deformation and damage of the casing will cause mud and water to flow out of the formation, seriously affecting the normal production of oil...