Evaluation Method Of Hydraulic Fracture Conductivity Of Yanchang Continental Shale Gas Reservoirs

Oil and gas are non-renewable resources, with the annual growth of its consumption,instead of seeking new sources of energy is very important. Adsorption or shale exist in thefree state of shale gas and conventional gas has the same physical and chemical properties andabundant, great prospect. In a variety of measures to increase production of oil and gas fields,the hydraulic fracturing is a more effective and commonly used method of fracturing a highconductivity purpose is to form a channel for the flow of oil and gas seepage in the nearwellbore formation. In the hydraulic fracturing process, it also noted an important parameter:fracture conductivity, the ability to form a high fracture conductivity is the key to fracturingoperations.Through laboratory tests fracture conductivity tests proved laboratory capacity andshort-term and long-term diversion conductivity is very different, long-term conductivityconductivity values relatively stable when compared to the short-term flow capacity fell asmuch as50%. Experiments also showed a huge difference in gas and liquid measuringconductivity measurements, which directly assess the potential of changing the gas pressurebefore, optimization, evaluation of the effect of pressure and predict the preferred proppantidea to make more gas fracturing operations a rational and purposeful. Experiment also showsdistilled water and fracturing fluid glue on fracture conductivity have hurt.However, the actual conductivity and conductivity underground laboratory tests in sandapproach, laid proppant, fracture closure, etc. are not the same, the paper factors that couldcause actual conductivity of the underground for a more detailed analysis. Due to factorsaffecting underground actual fracture conductivity is more, this paper discuss two methods toobtain the actual downhole fracture conductivity value:(1)Fracture conductivity calculated bynumerical simulation of the production history data inversion;(2)To establish a new model,the calculated PwD(tD)~tDthe plates, the plates through the data to match the estimatedfracture conductivity. Through the evaluation of fracture conductivity can be further guidanceon-site fracturing operations.