Acid Fracturing Technology And Its Application In Geothermal Development Of Carbonate Rocks

If without acidification fracturing in low permeability sandstone oilfield,someare no oil, and some are only low yield.Most carbonate field require acidification.Acid fracturing is stable and effective measures to keep the oil yield, and is a reservoirstimulation techniques. According to many years of experience in the construction ofgeothermal wells,acid fracturing technique can be used to geothermal wells ofcarbonate bedrock fissures,as an effective stimulation techniques. To protectformations to improve the effect of acid fracturing,must be based on thecharacteristics of strata,select the appropriate acid, formula,make it compatible withthe formation.In order to protect the formation and improve the effect of acidfracturing.Select the appropriate acid, formula, Make it compatible with the formation,with possible construction technology must be based on formation characteristics,Based on the Hedong District Gang Zhashan of public rental project-HD-39Bgeothermal wells.Analysis of the role and significance of acid fracturing technologyin carbonate formations geothermal wells. The project consists of the Tianjin CleanEnergy Heating Co., Ltd. invested development and construction, The entire projectincluding residential buildings, schools. Tianjin Clean Energy Heating Co., Ltd. isresponsible for15.9×104m2winter heating engineering, Using for heating,Development of geothermal reservoir is Paleozoic Ordovician.By drilling instance, achieved good results as well by using reasonable welldrilling technology, First, by the analysis of existing geological and drillingdata,Determine the geothermal geological characteristics and thermal storageconditions in the area. Demonstrated the feasibility of the Ordovician geothermalreservoir is better can be mined. Then heat geology, geophysics, drilling and otherwork to further develop land. Proved Paleozoic Ordovician reservoir has a certainheat storage conditions. After the completion of HD-39B geothermal wells to test thewater is not ideal, productivity is very low, but the analysis of the consolidated resultsof its logging, there are some cracks, with acid stimulation conditions. Finally,threeare three times crowded acidification technology, making carbonate layer and acidified material chemical reaction, and successfully expand fissures, effectivecommunication of the geothermal reservoir channel, Production from5.4m3/h to80.83m3/h, temperature from50℃to72℃, the well qualified to become ahigh-quality, Well was successful delivery and acceptance, and by the construction+side and geothermal administration alike.Thus, the acid fracturing technology not only apply to the development of oil andgas layer, the same applies to the carbonate layer geothermal wells, Base ongeothermal wells’ actual condition and formation features,we will promote the use ofacid fracturing technology in geothermal wells in the future exploration anddevelopment process.