Mechanism And Technique Of Reservoir Enhancement For Unconventional Natural Gas In Longtan Coal Measure Of GuiZhou Songhe

Development technology of coal seam gas in development areas of coal seam groups has its particularity.C haracteristics of coal seam groups and its geological environment profoundly affect the transformation resistance of coal reservoir. Stacked reservoir occurrences of resources in coal seam gas and sandstone gas layers determine the selectivity of strengthening technology of the reservoir. This paper selected non-General gas hid in Longtan coal Department,sōng hé jǐng tián,panjiang mine,Guizhou province,a typical area of seam group development, for research object.Based on coal storage layer’s geological background and its basic geological parameter and development exploration test research,with geological analysis method for main means, this paper researched the geological features of seam gas development and storage layer features, established geological model of seam gas development, stated the suitable distribution between geological conditions of seam gas development and development engineering under seam group conditions, analyzed the mechanism and process of reservoir reinforcement according to geological basis of development and the principle of engineering technique,constructed the key process for reservoir strengthening technology in the development area of coal seam groups, and formed a localization project for the development of technical systems. The research showed that: high temperature,super pressure, and supersaturation are features of storage layer in Longtan coal measure strata and “complex, high, wide, short, and more” are the typical fracturing crack form features of the research district.Coal rock’s macro fracturing, ground stress,coal body structure, coal rock’s mechanical nature,shot hole parameter, and across sandwich mechanical nature of isolation dissection are inner factors that affect its development.Whereas,engineering construction is the external factor that affects its development.The fracturing effect of coal storage layer can be significantly improved by the process and techno logies of small layer shot hole,segment fracturing, voted ball seal blocking, fracturing workers of mechanical filling sand, shot hole seam of 16 hole/m, sandstone layer of 32 hole/ m, acid of fracturing liquid formula, multilevel plus sand process of mo re grain diameter type, and fracturing liquid optimization ratio.This paper analyzed and discussed hydraulic fracturing effects factors of storage layer from geological restriction and engineering control aspects,thereby establishing the geological theory of hydraulic fracturing transformation in storage layer of coal seam groups and construction parameter system, and building the key process technology of hydraulic fracturing in coal storage layer.