Abstract

The purpose of the article is to establish the laws of physicochemical processes occurring in the wellbore, constructed in the sedimentary rocks, during the circulation of flushing fluids, and formulate on their basis adequate technological measures of the hydraulic well flushing program, the implementation of which will provide sufficient well construction, productivity, and economy. The novelty of the obtained results is in the methodological development of the regulations for drilling and related works in oil and gas wells, which implementation will ensure the avoidance of negative manifestations of the rock properties. The practical results of the article are to study a wide range of properties of various chemical compounds designed to increase the degree of stability of sedimentary rocks in the wellbore walls; use of test substances will significantly increase the drilling productivity, reduce the time for work related to elimination of complications and accidents in the well or complete exclusion of the latter; it will also provide the overall increase in efficiency and cost-effectiveness of the well construction process. Practical significance of article is as follows: increasing the efficiency of well work, based on the methods of integrated use of technological measures of the hydraulic program of well washing in preventing the manifestation of negative properties of sedimentary rocks.

The development and implementation of a progressive complex hydraulic washing programme for wells under construction are analyzed involving modern methods of analytical analysis and experimental studies. The drilling circulation processes in a well were modeled in terms of experimental wells involving a drill rig UKB-4P and corresponding auxiliary tools and equipment. Analytical studies was carried out with application of sequence of operations widely tested for the solution of scientific problems: formulation of a problem and drawing up of the settlement scheme of the investigated object; development of a physicochemical model that describes the nature of the processes; selection of the method to solve the specified tasks; solution of basic mathematical dependences of the process with maximum use of computational experiment; analysis of the obtained results; formulation of adequate conclusions and recommendations.

Keywords:Sedimentary rocks; Drilling; Rock breaking; Metal casings; Polymers