CAJ | 학술논문

为了研究低渗/致密油藏分段压裂水平井的开采机理和渗流规律，通过建造高压仓、密封和改进多通道电阻率测量方法，研发了大型露头岩样高压物理模拟实验系统。通过分段压裂水平井物理模型的岩样筛选、模型的制作和封装、模型抽真空饱和以及有效驱动的物理模拟评价等方法的研究，建立了分段压裂水平井物理模拟实验方法。进一步结合低渗/致密油藏非线性渗流油藏数值模拟软件研究了低渗/致密油藏分段压裂水平井渗流规律。研究结果表明：在相同驱替压差下，分段压裂水平井的压力梯度值要比普通水平井的压力梯度值高，且随着压裂裂缝半缝长的增加，压力梯度值也增加；当水平井水平段长度一定时，储层渗透率越低，分段压裂水平井的最佳分段数越多；当储层渗透率一定时，水平井水平段长度越长，水平井压裂的最佳段数也越多，最佳裂缝半缝长反而呈现减小的趋势；对于低渗/致密油藏分段压裂水平井开采来说，对产量最为敏感的是压裂段数，其次是裂缝半缝长，而裂缝导流能力最为不敏感。
위료연구저삼/치밀유장분단압렬수평정적개채궤리화삼류규률，통과건조고압창、밀봉화개진다통도전조솔측량방법，연발료대형로두암양고압물리모의실험계통。통과분단압렬수평정물리모형적암양사선、모형적제작화봉장、모형추진공포화이급유효구동적물리모의평개등방법적연구，건립료분단압렬수평정물리모의실험방법。진일보결합저삼/치밀유장비선성삼류유장수치모의연건연구료저삼/치밀유장분단압렬수평정삼류규률。연구결과표명：재상동구체압차하，분단압렬수평정적압력제도치요비보통수평정적압력제도치고，차수착압렬렬봉반봉장적증가，압력제도치야증가；당수평정수평단장도일정시，저층삼투솔월저，분단압렬수평정적최가분단수월다；당저층삼투솔일정시，수평정수평단장도월장，수평정압렬적최가단수야월다，최가렬봉반봉장반이정현감소적추세；대우저삼/치밀유장분단압렬수평정개채래설，대산량최위민감적시압렬단수，기차시렬봉반봉장，이렬봉도류능력최위불민감。
This study investigates the exploration and porous flow mechanisms in multi-stage fractured horizontal wells (MSFHWs)inlow permeability/tight oil reservoirs (LPTORs).A high-pressure physical simulation system for large-scale outcrops is developed byconstructing a high-pressure chamber,sealing and improving multi-channel resistivity measurement techniques.A physical simula-tion method for MSFHWs is established based on simulation and evaluation of the physical model in core sample selection,produc-tion and packaging,vacuum saturation,and effective driving.Further,porous flow pattern of MSFHWs in LPTORs are studied u-sing a nonlinear porous flow simulation software.Under the same displacement pressure,the pressure gradient in MSFHWs is grea-ter than that in ordinary wells and grows with increasing half-length of the fractures.When the length of a MSFHWis fixed,theLPTOR with lower permeability requires a greater number of optimal fracturing segments;when the permeability of a LPTOR isfixed,the optimal number of fractured segments increases with the horizontal length of the MSFHWbut the half-length of optimalfractures shows a declining tendency.For exploitation of MSFHWs in LPTORs,the number of fractured segments is most sensitiveto well production,followed by the half-length of the fractures,and fracture conductivity the last.