The Research And Application Of The Gas Protection In Sunbeam Permian

Sunbeam Permian is mainly distributed in the Jiamuhe group in the western part of the Junggar Basin. Proven geological oil reserves of17104×10t, area177.5km2; proven natural gas geological reserves of206.72×108m3area33.09km2has huge potential for exploration and development. But it has not yet achieved a breakthrough on the exploration because of gas reservoirs buried deeper, the reservoir complex geological conditions as well as poor reservoir properties. The reason, in the way of the current over-balanced drilling the reservoir damage seriously the lead to inefficient exploration and development. Therefore, the formation of a well-established drilling the reservoir protection program, the necessity and feasibility of Permian gas efficient exploration.In this study, focus on objects to the Permian Jiamuhe gas reservoir, the reservoir geological characteristics and formation damage mechanism of a breakthrough, through the system of reservoir damage characteristics analysis targeted drilling reservoir protection program. The combined specific test wells, rock law and pressure control technology from the engineering geological conditions, wellbore stability, portability carried out the the gas drilling necessity and adaptability comprehensive study completed the drilling program aided design and field trials. The main achievements and understanding as follows:1) This paper comprehensives analysis of the complete Sunbeam Permian gas reservoir engineering geological features, combined with a lot of basic information to complete the analysis and the type of damage judgment gas potential damage factors. Recognize that by studying the the Permian gas complex geological conditions, the the pore base block conventional drilling liquid water blocking damage and cracks in the solid-liquid phase intrusion is the main type of damage, is also a key reservoir protection.2) According to the findings of the reservoir geology and reservoir damage that the key to good reservoir protection invasive crack rock blocks and liquid intrusion caused damage and avoid solid-liquid phase, the targeted area Permian The gas drilling reservoir protection program. As the complexity of the reservoir porous media and strongly heterogeneity overbalance temporary blocking technology in the area of application is limited; owe the whole process of balanced drilling and gas drilling program can effectively protect the reservoir, exploration discovery rate.3) This paper studies the gas drilling wellbore stability study of the Permian,explains Geological factors affecting wellbore stability, volcanic breccia, weathering and erosion with fracture zones wellbore stability study; We will establish gas drilling for gas, formation fluid, strata outlet on different conditions, wellbore stability evaluation methods, and combined with M wells carried out a case study.4) This paper completes the area Permian gas drilling to bring rock and Pressure Control Technology. Permian gas reservoir geological conditions and the drilling parameters and gas drilling, formation outlet, formation water, gas drilling to carry rocks computing model and carried out a case study.5) This paper participates in the M3well drilling program to protect the reservoir design, and drilling of the well field test. The test results show that the formation of the program can be good protection reservoir, formed by secondary design parameters to meet the needs of the field test.Overall, the research methods and technological achievements for the liberation of Permian gas reservoir to provide an effective technical support to draw on research methods and technology base, but also provides the Exploration and Development of Xinjiang similar hydrocarbon reservoirs.