Application and Evaluation of Natural Gas Recovery Process During Tight Gas Oil Testing in Wenxing Gas Area in Northwest Sichuan
Shaximimiao Formation gas reservoir in Wenxing gas area in northwestern Sichuan is a typical tight sandstone gas reservoir.Acidizing and sand fracturing have good effects on improving gas recovery.The acid flu-id injected into the formation and the fracturing proppant are mixed with the raw gas during oil testing.Usually,in the stage of oil test and production,gas is discharged back to the ground and directly ignited,which wastes re-sources and also risks environmental pollution.In view of the complex mixture during tight gas drainage and pro-duction and the disadvantages of traditional drainage and production methods in economy and environmental pro-tection,the gas recovery process of"double separation+double sand removal+multistage throttling+supersonic de-hydration and hydrocarbon removal"was designed and applied.The application effect of this technology in Wenxing gas area of northwest Sichuan was evaluated and analyzed,The process adopts tubing special thread in-stead of traditional steel pipe welding,and the installation cycle is reduced by 70％.The process combination has good sand removal and separation effect for the flowback material in complex strata at the early stage of production,and the temperament after dehydration and dehydrocarbon-removal reaches the standard to achieve successful recov-ery.At the same time,the energy consumption of equipment and facilities is low,which is an important measure to green,low-carbon and benefit development.It has not only achieved good economic and social benefits in the pres-ent block,but also demonstrated good application value.
jet recoverysand removaldehydration and dehydrocarb removalgreen and low carbonbenefit exploitation
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