CAJ | 학술논문

针对燃爆压裂设计中难以定量确定强动载条件下破裂压力的问题,利用"岩石动态损伤模拟试验装置"对3种抗拉强度岩心进行5种加载速率下的19组岩石冲击开裂试验;经试验验证该装置可模拟定压供给边界条件下中心一裸眼井的油藏条件,并直接对小型岩心试样中模拟井孔进行水压冲击破岩试验,且可形成153.17 MPa/ms以内的加载速率,完全可以模拟燃爆压裂的实际情况.经过对试验数据回归分析,发现动/静破裂压力差值与加载速率呈现很好的对数关系,经验证该回归模型计算误差为0.95%,具有较高精度;该研究成果可为燃爆压裂设计中的最低峰值压力确定提供指导,对提高该增产措施的普适性和成功率具有一定指导意义.
침대연폭압렬설계중난이정량학정강동재조건하파렬압력적문제,이용"암석동태손상모의시험장치"대3충항랍강도암심진행5충가재속솔하적19조암석충격개렬시험;경시험험증해장치가모의정압공급변계조건하중심일라안정적유장조건,병직접대소형암심시양중모의정공진행수압충격파암시험,차가형성153.17 MPa/ms이내적가재속솔,완전가이모의연폭압렬적실제정황.경과대시험수거회귀분석,발현동/정파렬압력차치여가재속솔정현흔호적대수관계,경험증해회귀모형계산오차위0.95%,구유교고정도;해연구성과가위연폭압렬설계중적최저봉치압력학정제공지도,대제고해증산조시적보괄성화성공솔구유일정지도의의.
Based on the problem of the quantitative description of blasting well breakdown pressure,19 experiments on rock cracking with three kinds of tensile strengths under 5 loading rates are carried out by the rock dynamic cracking simulation device. The experiments verify that the device can simulate the reservoir conditions of a center open hole with the boundary conditions of constent pressure while giving a test of rock fragmentation by water pressure impact on the small simulation hole immediately. It can offer the loading rate bellow 153.17 MPa/ms,which can simulate the real blasting fracturing condition completely. The regression analysis of experimental data shows that the difference of dynamic and static breakdown pressures with the loading rate shows a very good logarithm relationship,and the regression model presents a calculation error of 0.95%. The research results can help to ascertain minimum peak pressure in the design of detonation pressure and enhance the production of universal application and the success rate.