Damage Evaluation System Of Geothermal Wells Reservoir For Beijing Yaojiayuan Region

Study on the geothermal reservoir lithology is mainly the fractured carbonate,dolomite, five reservoir sensitivity exhibited moderate water sensitive and strongstress sensitivity, groundwater resources of the study area is extremely rich, the watertemperature at about60degrees, the degree of mineralization in the600mg/L belongsto the low salinity of ground water resources. Summary the reason for Heat reservoirdamage combined with the geological conditions, the geothermal well watertemperature conditions, construction technology etc. Through transient testingevaluation and the fuzzy mathematics evaluation damage degree of the reservoir inthe study area respectively. Transient testing evaluation for evaluation of reservoirdamage and the indoor experiment is to obtain the geothermal reservoir rock samplefrom the geothermal field. The HTHP dynamic damage experiment instrumentsimulation of underground reservoir damage, through core flow experiment measuredbefore and after the damage of core permeability. The extent of damage with well testdata field using the skin coefficient method to evaluate reservoir, total skin factoris-0.921, Conditions ratio of1.991, Capacity ratio of1.250, the extent of damage ofgeothermal reservoir is serious, so the skin factors of the larger proportion of totalskin factor, the construction site by acidification combined production has achievedgood effect of increasing the correctness of the evaluation results.The extent ofdamage using fuzzy evaluation method for evaluating reservoir,18factors of incausing reservoir damage will become evaluation factor system, Establish ahierarchical model were determined using AHP factors and factor weights class,Determine the membership five geothermal wells based on experimental data andfield well test data, through laboratory experiments measured the ratio of the thermalreservoir permeability damage, in the (0-1) interval extent of the damage will bedivided geothermal reservoir is severe, moderate, mild, no damage, Finally Fuzzyevaluation by the degree of geothermal reservoir is0.6764, belongs to moderatedamage.Combined with reservoir damage evaluation results and the construction of siteconditions,By combining the former reservoir stimulation program evaluation oftransient testing,The paper discussed separately from the two types of acid stimulationand increase fracture stimulation program,Presents really occupy a larger proportionof skin factor when using acid stimulation program,Really occupy a smallerproportion of skin factor when taking fracture stimulation program.For the study areausing transient testing of formation damage evaluation results obtained,The proposedstudy area is suitable reservoir stimulation program,Eventually yield results and thepredicted results can yield good agreement.Through the establishment of thegeothermal reservoir evaluation system,Reservoir Evaluation using VB6.0prepared toadapt the software to the study area,after several debugging, try to prove that the useof the software can quickly and accurately the extent of damage skin factor methodgeothermal reservoirs.