Polymembrane emulsified modified fiber for drilling fluid and preparation method thereof

Abstract

The invention discloses a film forming agent emulsifying and modifying fiber for a drilling fluid and a preparation method of the film forming agent emulsifying and modifying fiber. The film forming agent emulsifying and modifying fiber is prepared from the following raw materials: styrene, butyl acrylate, an initiator, an emulsifying agent, waterborne epoxy resin, water-soluble fiber and clear water. The preparation method comprises the steps: preparing an emulsion; and preparing the film forming agent emulsifying and modifying fiber. The performances of the film forming agent emulsifying andmodifying fiber disclosed by the invention are that the colloid stability is larger than or equal to 90%, the solid content is larger than or equal to 30%, the pH value is 7-9, and the permeation reduction rate of a filter cake is larger than or equal to 50%. The film forming agent emulsifying and modifying fiber disclosed by the invention has a good permeation reduction effect, pressure bearingcapacity, compatibility with a drilling fluid system and reservoir protection property, is capable of meeting the requirement of oil field drilling and realizes reservoir protection in a drilling process. The preparation method disclosed by the invention is simple in preparation process, easy to implement and low in production cost. Meanwhile, the film forming agent emulsifying and modifying fiberis nontoxic and harmless and has the characteristics such as environment friendliness and biodegradation simplicity and effectively reduces pollution to a reservoir.

Description

technical field [0001] The invention relates to a petroleum drilling fluid additive, in particular to a polyfilm agent emulsified modified fiber for drilling fluid. The invention also relates to a preparation method of the polymerizing agent emulsified modified fiber for drilling fluid. Background technique [0002] In the process of oil exploration and development in complex areas, wellbore instability and reservoir damage have become international technical problems. The water phase in the drilling fluid entering the wellbore formation and oil and gas reservoirs is the main cause of wellbore instability and reservoir damage. In order to prevent the water phase in the drilling fluid from entering the wellbore formation and oil and gas reservoirs, the drilling fluid system Wellbore walls of formations such as mud shale form films to stabilize the wellbore walls, and film-forming agents (ie film-polymerizing agents) are key treatment agents that prevent the water phase in dr...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a kind of emulsified modified fiber with polyfilm agent (i.e. film-forming agent) for drilling fluid, which can solve the problem of inability to effectively reduce seepage, stabilize the well wall and protect the reservoir during the current drilling process. At the same time, the polyfilm agent emulsified modified fiber has strong biodegradability, which can effectively reduce the pollution to the reservoir

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