LABORATORY AND INDUSTRIAL RESEARCH OF CEMENTATION PROCESS OF OIL-AND-GAS BORE HOLES IN THE CONDITIONS OF SEDIMENTARY ROCK BEDS
Abstract
Analytical and industrial laboratory research of factors of increase in reliability of fastening bore holes in the conditions of chemogenic sedimentations using the example of the Dnepr-Donetsk cavity deposits by developing modern steady-state mud spacers and new technical decisions and technologies of treatment of bore holes stagnant cavernous zones was carried out.
The research was done using methods of modeling and processing of research results in the SolidWorks, STATGRAPHICS, МАТНСАD environments, as well as methods of the mathematical experiment planning – orthogonal central composition planning; physical modeling of well circulation processes on a laboratory stand, equipped by a control and measuring block; laboratory control methods (according to DSTU B V 2.7-86-99), which technological properties of cement solutions and stone were studied in accordance with.
Restrictive requirements, applied to the process of fastening bore holes in the difficult mining and geological conditions of chemogenic sedimentations of Dnepr-Donetsk cavity oil-and-gas deposits, are studied. Research of technological indexes of the cement systems phase composition proves that the results of fastening depend on preparatory measures, conducted in the barrel of bore hole. It is well-proven that the high-quality cementation of bore holes can be provided only with the proper division of technological liquids, complete expulsing of boring washing liquid from circular space, the bearing-out of mud from stagnant areas, as well as preventing the repeated sludge accumulation in the cavernous intervals which were cleared before; the structured buffer liquids meet all of these requirements. Following the requirements of "technologies tandem" principle, namely providing the maximal compatibility with typical bore liquids and cement materials, the stabilized structured mud spacer, most fully adapted to the mining, geological, technical and technological conditions of bore holes building in the chemogenic sedimentations of the Dnepr-Donetsk cavity, was designed.
The requirements to provide the high-quality cementation of column in the conditions of chemogenic sedimentations are fully met by the specific technological parameters of mud spacers and hydrodinamically justified measures of barrel bore hole fastening preparation.
The results of industrial laboratory and analytical research are basic for planning regime parameters of column cementation process with the guaranteed high technical and economic indexes. Data on the study of sludge accumulation process within chemogenic sedimentations can be basis for justification of structural and technological parameters of devices for creating the axial motion of washing liquid in the bore hole cavernous zones
