CAJ | 학술논문

利用有限元软件ABAQUS，建立考虑流固耦合的水力裂缝扩展三维模型。压裂水力裂缝扩展模型采用cohesive单元进行裂缝面的设置，并针对裂缝位置采用变密度进行网格划分，提高压裂水力裂缝扩展计算的精确性。模型计算结果表明，水力裂缝开启和扩展过程中，孔隙压力等值线自裂缝向外以半椭圆形发散，压力值由靠近裂缝的高应力值向外逐渐减小；裂缝高度和宽度在裂缝张开初期快速扩展，到达一定高度后，基本保持不变；而半缝长随注入时间裂缝稳定增长，增长幅度渐渐降低。
이용유한원연건ABAQUS，건립고필류고우합적수력렬봉확전삼유모형。압렬수력렬봉확전모형채용cohesive단원진행렬봉면적설치，병침대렬봉위치채용변밀도진행망격화분，제고압렬수력렬봉확전계산적정학성。모형계산결과표명，수력렬봉개계화확전과정중，공극압력등치선자렬봉향외이반타원형발산，압력치유고근렬봉적고응력치향외축점감소；렬봉고도화관도재렬봉장개초기쾌속확전，도체일정고도후，기본보지불변；이반봉장수주입시간렬봉은정증장，증장폭도점점강저。
By using finite element software ABAQUS, 3D model of hydraulic fracture propagation in consideration of fluid-solid coupling was established. Hydraulic fracture propagation model adopted cohesive unit to set fracture surfaces. And aiming at the fracture position, gridding of variable density was used to improve the accuracy of calculations of hydraulic fracture propagation. The calculated results showed that during hydraulic fracture opening and propagation process, pore pressure contours transpired as semiellipsoid from fracture to the outside, and the pressure value decreased gradually from near the fracture. The fracture height and width expanded rapidly at the early stage when the fracture opened. Once they reached a point, they remained about the same. However, the half fracture length increased steadily with the injecting time while the increasing range reduced gradually.