An Organic Salt Drilling Fluid with Enhanced Inhibition and Plugging Performance

Abstract

The invention provides organic salt drilling fluid with enhancing inhibiting and blocking properties. The organic salt drilling fluid is prepared from the following materials in percentage based on mass content of water: 2 to 4 percent of salt tolerating clay, 0.3 to 0.5 percent of sodium carbonate, 30 to 60 percent of organic salt, 0.2 to 0.5 percent of shear force improving agent, 0. 5 to 2 percent of filtrate reducer, 1 to 4 percent of inhibiting and blocking agent, 1 to 4 percent of nano blocking agent, 0.2 to 0.5 percent of fluorocarbon alcohol, 0. 5 to 2.5 percent of polymeric alcohol, 0. 5 to 1 percent of inhibitor polyether amine, 1 to 2 percent of crystalline flake graphite, 3 to 5 percent of ultra-fine light calcium carbonate and 190 to 260 percent of barite. The drilling fluid solves the problems that conventional organic salt drilling fluid is weaker in blocking capability to mud shale microcrack, and is not ideal in surface hydration inhibiting property, has good inhibiting and blocking properties under the conditions of drilling shale and mudstone strata, and can meet the requirement of unconventional oil and gas well construction to water-based drilling fluid.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid for petroleum drilling, and in particular relates to an organic salt drilling fluid. Background technique [0002] In the long run, the relative shortage of energy will be a major problem facing our country. In the case of increasingly tight conventional energy supply, it is imminent to rationally develop and utilize unconventional energy resources. Among unconventional energy resources, shale gas resources are abundant and have great potential for development. However, the development and utilization of shale gas in my country is still at a low level. In the initial stage, experience is lacking, technology is immature, and policies need to be improved. my country's shale formations generally have the characteristics of high shale content, well-developed bedding, and micro-fractures. The exploration and development process is likely to cause wellbore instability. Drilling fluid is the "bloo...

AI Technical Summary

Problems solved by technology

However, many shale gas formations are rich in organic matter, which leads to the characteristics of both hydrophilic and oil-wet formations, and the problem of surface hydration is prominent. The conventional organic salt drilling fluid system has insufficient performance in sealing and inhibiting surface hydration. To meet the development needs of unconventional energy such as shale gas, the scope of application is limited

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