CAJ | 학술논문

页岩气井压裂后初期产量高，随后产量迅速递减，但在预测页岩气压裂水平井产量时，目前国内尚无实际产量递减规律可借鉴。为此，进行了2.5和1.0 kg/m2两种铺砂浓度下的长期导流能力试验。试验结果表明，支撑剂的嵌入及破碎导致前2 d导流能力约降低43％，4 d后导流能力则降低得很少。将试验结果应用到川东南某井数值模拟中，恒定导流能力方案产量为考虑长期导流能力方案的2～3倍；10年生产动态预测结果显示，示例井生产周期可分为3个阶段，前2年产量递减率高达42％～46％，第3～4年产量递减率降至27％～37％，第5～10年产量递减率缓慢降至4％以下。研究结果表明，页岩支撑剂评价优选应以裂缝长期导流能力试验结果为基础，考虑裂缝长期导流能力影响的产量递减规律可为页岩气压裂水平井重复压裂时机的确定提供依据。
혈암기정압렬후초기산량고，수후산량신속체감，단재예측혈암기압렬수평정산량시，목전국내상무실제산량체감규률가차감。위차，진행료2.5화1.0 kg/m2량충포사농도하적장기도류능력시험。시험결과표명，지탱제적감입급파쇄도치전2 d도류능력약강저43％，4 d후도류능력칙강저득흔소。장시험결과응용도천동남모정수치모의중，항정도류능력방안산량위고필장기도류능력방안적2～3배；10년생산동태예측결과현시，시례정생산주기가분위3개계단，전2년산량체감솔고체42％～46％，제3～4년산량체감솔강지27％～37％，제5～10년산량체감솔완만강지4％이하。연구결과표명，혈암지탱제평개우선응이렬봉장기도류능력시험결과위기출，고필렬봉장기도류능력영향적산량체감규률가위혈암기압렬수평정중복압렬시궤적학정제공의거。
Production of a horizontal well in shale gas reservoir is high initially after fracturing ,but de-clines rapidly later .T here is no practical decline profile that can be considered to predict such production in China now .In this background ,experiments of long-term flow conductivity were conducted with sanding concentration of 2.5 kg/m2 and 1.0 kg/m2 respectively .Results showed that the conductivity declined ap-proximately 43% in the first 2 days due to proppant embedding and crushing ,and at lower rate 4 days af-ter .The experiment results were used in the numerical simulation of a well located in southeast of Sichuan ;the production in the fixed-conductivity case was considered 2 or 3 times of that in the long-term flow con-ductivity case .Ten-year performance prediction demonstrated that the production cycle of sample well could be divided into 3 stages :year 1 2 ,w hen the decline rate could be 42% 46% ,year 3 4 ,w hen the de-cline rate was stabilized within 27% 37% ,and year 5 10 ,when the decline rate was lowered to 4% or less . It was therefore concluded that proppant for fractures in shale reservoirs should be evaluated and selected using the results of long-term flow conductivity experiments ,and the production decline profile can be con-sidered to determine the re-fracturing time for fractured horizontal wells in shale gas reservoirs .