CAJ | 학술논문

目前气井压裂后产量动态预测的计算模型大多是针对稳态渗流或者是无限大地层的不稳态渗流过程，很少涉及普遍存在的拟稳态流动期间产量动态预测方法。为此，根据压裂气井地层中气体的渗流过程，首先基于边界控制的镜像反映原理所推导出的拟稳态流期间，气层中存在一条有限导流能力垂直裂缝井的无量纲压力解的通用表达式，提出了压裂气井拟稳态流动期的产量动态预测方法，然后给出矩形封闭性气层拟稳态流开始出现时间的确定方法。计算结果表明：苏里格低渗气田压裂井投产2~4个月即进入边界控制的拟稳态流动期，150 m合理的裂缝单翼长度所需要的导流能力大约为30 D·cm。本文所提出的产量动态预测方法也可用来优化其他低渗气田的压裂裂缝参数和施工规模。
목전기정압렬후산량동태예측적계산모형대다시침대은태삼류혹자시무한대지층적불은태삼류과정，흔소섭급보편존재적의은태류동기간산량동태예측방법。위차，근거압렬기정지층중기체적삼류과정，수선기우변계공제적경상반영원리소추도출적의은태류기간，기층중존재일조유한도류능력수직렬봉정적무량강압력해적통용표체식，제출료압렬기정의은태류동기적산량동태예측방법，연후급출구형봉폐성기층의은태류개시출현시간적학정방법。계산결과표명：소리격저삼기전압렬정투산2~4개월즉진입변계공제적의은태류동기，150 m합리적렬봉단익장도소수요적도류능력대약위30 D·cm。본문소제출적산량동태예측방법야가용래우화기타저삼기전적압렬렬봉삼수화시공규모。
At present, the computing model for dynamic prediction of fractured gas well production is mostly for steady state seep-age or for unsteady state seepage of inifnite formation, and rarely involved in production dynamic prediction method during pseudo steady lfow period. For this reason, according to seeping process of gas in formations of fractured gas well, ifrst based on the fact that, in pseudo steady lfow period derived from mirror relfection principle controlled by boundary, there is a vertical fracture of ifnite conduc-tivity capacity in the gas reservoir in the well, this paper presents a method for dynamic prediction of fractured gas well production in pseudo steady lfow period based on a general expression of dimensionless pressure solution, and then gives the method for determining the time when pseudo steady lfow begins to occur in rectangular bounded gas reservoir. The calculation results show that the fractured wells in Sulige low-permeability gas ifeld are in boundary-controlled pseudo steady seepage period in two to four months after being put into production, and the conductivity capacity required by single wing fracture length of 150 m is about 30 D·cm. The method for dynamic prediction of production presented in this paper can also be used to optimize the hydraulic fracture parameters and fracturing size in other low permeability gas ifelds.