Water-based barite liquid plugging agent with thermal sensitivity

Abstract

The invention relates the technical field of plugging agents for well drilling and relates to a water-based barite liquid plugging agent with thermal sensitivity. The formula of the plugging agent comprises the following components in percentage by mass: 27 to 31.2 percent of tap water, 0.3 to 0.6 percent of zinc stearate, 0.4 to 0.6 percent of sulfonated tanning extract for drilling fluid and 68 to 72 percent of blanc fixe. The plugging agent is prepared by a site mechanical mixing method. Experiments verify that the plugging agent overcomes the technical defects of low adaptability, no thermosensitive synergistic action and low plugging success rate in the prior art, and the technical defect that the plugging agent in the prior art cannot replace cement slurry to form compact plugs in a mine shaft, has the advantages of high adaptability, obvious high filtration thermosensitive synergistic action and high plugging success rate, can replace the cement slurry to form compact plugs in the mine shaft under complicated conditions of treating blowout and leakage, avoids risks of safety accidents easily occurring during cement slurry smashing and also has the advantages of low cost and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of lost circulation agent for well drilling, in particular to a water-based barite liquid lost circulation agent with heat-sensitive properties. Background technique [0002] Lost circulation agents are widely used in the drilling industry. When lost circulation occurs in the drilling process, it is necessary to seal the formation with a plugging slurry, and the drilling can only be resumed after the lost circulation is eliminated. [0003] The existing bridging plugging agent is commonly used in drilling, and its components are usually mixed with nutshell particles of various particle sizes or different lengths, plant fibers or mineral fibers, and flake minerals in a certain proportion. [0004] For example, the publication number is CN101638577, and the publication date is a patent document on February 3, 2010, which discloses a natural feather plugging fiber for drilling oil and gas wells in an oil field...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the above-mentioned technical problems, the present invention proposes a water-based barite liquid leakage stoppage agent with heat-sensitive properties. By adopting the present invention, the problems of poor adaptability and no heat-sensitive synergistic existing in the prior art are solved. function, the success rate of plugging is not high enough, and at the same time, it cannot replace the cement slurry to form a dense plug in the wellbore. It can replace the cement slurry to form a dense plug in the wellbore when dealing with the complex situation of "spraying and leaking", which avoids the risk of safety accidents when cementing the slurry, and has the advantages of low cost and no pollution to the environment.