Deepening Research On Drilling Fluid System Of Xiachuandong Complex Well

Chuan East horizontal wells, high angle wells of the special process wells gradually increased, acceleration effect increases with each passing day, current drilling fluid system is difficult to adapt to the drilling engineering of mudstone, shale and coal seam collapse prevention, high differential pressure and high angle deviated well segments of anti sticking, well anti card and drilling fluid has stable performance and other aspects of technical requirements. Therefore, it is necessary to Chuan East drilling fluid system to further deepen the study in order to adapt to the requirements of the new situation.Through the wall loss mechanism of stability and ease of stratum distribution and characteristics were studied, corresponding measures are put forward according to the different lithology, focus on the development of organic salt, polymerization alcohol anti sloughing drilling fluid system, nature of the main processing agent are analyzed, and the auxiliary processing agent was optimized, to rolling recovery rate, linear expansion value, the experiments of anti pollution and other means to evaluate the optimization for Chuan East area of Jurassic and shale, coalbed anti sloughing drilling fluid system. From the Triassic drilling technical difficulties of using common ion effect and balanced activity theory, optimized the polysulfonate drilling fluid system. From the lubricant temperature resistance, salt resistance, foaming properties as the breakthrough point, using polymeric alcohol lubrication and improve the sealing performance of drilling fluid, improve the quality of filter cake, optimized anti card solution process cards to reduce the seepage stratum pressure transmission of ideas, the formation of Permian special anti card technology. By not adding to Tu Ban, in the water directly into the KC1, formic acid salt inhibitors based on, join filtrate reducers, plugging agent and processing functions, to meet the requirements of anti temperature, carrying sand, forming a suitable for Carboniferous horizontal section drilling requirements in non bentonite drilling fluid system.Development of five sets of drilling fluid system constructed in the Chuan East trial to improve drilling speed, reduce the complexity of the accident, improve the comprehensive economic benefit. And then form the blocks of the modular technology program to promote the application.