Successful development of mud intrusion simulation

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On September 5, it was learned from the China Petroleum Exploration and development research institute that relying on the national major oil and gas projects, the Institute of logging and remote sensing technology of the Institute and the China University of petroleum have the characteristics of one machine for dual use (East China) The research and development of China's first large-scale drilling mud invasion experimental simulation device for tight sandstone reservoir jointly undertaken by Hebei bestbest information equipment Co., Ltd. made a major breakthrough in Baoding, Hebei, and the equipment was successfully put into production at one time

it is reported that there is mud invasion to varying degrees after the drilling uncovers the formation. Under the action of the pressure difference between the borehole and the formation, the mud filtrate seeps into the formation according to a certain law, which will change the original oil and gas distribution in the reservoir around the well, adhere to the clean state (it is best to clean after each experiment is completed) and affect the subsequent logging information, making it possible to judge the reservoir fluid property with logging data, which is multi-resolution. Low porosity and low permeability sandstone and tight sandstone reservoirs are the key objects of oil and gas exploration compared with PCU at home and abroad. Numerical simulation shows that due to the poor physical properties, extremely complex pore structure and strong heterogeneity of this kind of reservoir, the mud invasion law is quite different from the conventional medium and high porosity and permeability sandstone reservoir, but the specific factors and internal mechanism affecting the invasion are not clear. For a long time, there has been a lack of large-scale experimental equipment and analysis means that can fully simulate the drilling conditions at home and abroad. Therefore, the study of mud invasion law for such unconventional reservoirs is of great significance to improve the success rate of exploration and development, optimize mud performance and protect reservoir productivity

relying on the eighth topic of the national major oil and gas special logging project, the research team broke through three key technologies in the process of device development: saturation and pressurization of large-scale sample module, sealing and pressure maintaining of mud invasion device, and real-time dynamic monitoring of the whole process of mud invasion, and made innovative progress in fan-shaped sample design, radial invasion morphology of simulated mud filtrate, invasion chamber design, and multi-method invasion dynamic monitoring. The device can realize real-time monitoring of resistivity and pressure radial changes after mud invasion under different mud types, different pressures and different porous and permeable formations

experts pointed out that the design concept, performance and key technical indicators of this set of experimental device have reached the international leading level, filling the gap at home and abroad. It provides an important technical means for correctly understanding the real situation of mud invasion in oil and gas field exploration and development and the impact of invasion characteristics on oil and gas reservoir logging identification and evaluation, and is of great significance to the basic theory and application technology research of logging and reservoir engineering

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