油藏中裂缝流动能力反演研究

Now, the degree of oil and gas exploration and development is higher and the difficulty is bigger in china. The reservoir types of oil and gas exploration and development are turning to low-permeability sandstone、tight sandstone、marine carbonate rocks and unconventional reservoir. Natural fractures are developed widespread in these reservoirs and the distribution and flow capacity of natural fractures are the main controlling factors of high efficient development of it. Though the earthquake prediction is the main technical measures of identifying the fractures, it is difficult to characterize the filling degree and the flow ability of fractures. This project is trying to establish a method of charactering and evaluating of the flow ability of fractures between wells through the dynamic production data and provide more reliable basis for fine reservoir development adjustment..Object of project research: This project reveals the natural fracture multiphase fluid flow rule and establishes the numerical simulation method of multi-scale fractures distribution based on the Fluid flow physics experiment of multi-scale fractures. According to uncertainty of the parameter of flow in fractured, this project realizes the flow parameters inversion technology; By studying the influence degree of fracture distribution and the flow ability on the recovery of oil, we can optimize the development plan and realize the fine effective development of these kinds of reservoirs in China. The recovery rate in the test area is improved 1-2 percentage points after the application of this method..Through this research, we can build up the characterization technology, which can promote some technology progress and innovation, such as the connectivity between wells, production optimization progress etc. This research will provide theory and method support for get more oil resources in international.

随着我国油气勘探开发程度越来越高，难度也越来越大，油藏类型总体上向低渗透砂岩、致密砂岩、海相碳酸盐岩、非常规转变，这些油藏普遍发育天然裂缝，裂缝的流动能力是高效开发的主控因素。本项目拟通过生产动态数据对油藏中裂缝的流动能力进行表征和评价，为油藏精细开发提供依据。.项目研究目标是：基于不同尺度裂缝流动物理实验，揭示天然裂缝多相流体流动规律，建立多尺度裂缝空间分布为主研究对象的数值模拟方法；针对裂缝流动参数不确定的问题，实现基于生产动态的裂缝流动参数反演技术；研究裂缝分布与流动能力对开采的影响程度，优化开发方案，实现我国该类油藏的精细有效开发。预计成果应用后提高油藏采收率1-2个百分点。.通过研究，可以建立起裂缝流动能力表征技术，并带动裂缝性油藏井间连通性、生产优化等相关技术的进步和创新，为走向国际获取更多石油资源提供技术支撑。

我国油气勘探开发程度越来越高，难度也越来越大，勘探开发向深层、具有天然裂缝的海相碳酸盐岩、低渗透等非常规油藏转变，我国海相碳酸盐岩石油资源量石油资源量340亿吨，占全国的27%，海相碳酸盐岩油藏已成为我国石油勘探开发的主战场，具有广阔的发展前景。裂缝的不准确性模拟与预测导致油藏水窜严重、开发效果差，裂缝内流动精确模拟与连通性预测是油藏高效开发的关键，也是世界性研究难题。通过四年的研发，形成5项目研究成果：（1）建立离散裂缝系统流体流动耦合数学模型，形成离散裂缝描述方法及方程组精快解法；（2）建立油藏数值模拟最优化反演模型，形成了裂缝储集体优化反演技术；（3）形成基于生产动态的井间裂缝流动能力反演方法；（4）塔河示范区应用，指导新增注水井组10个，新增水驱控制储量1591万吨，两年累增油15.15万吨，提高采收率1.5百分点；有效支撑油田老区的新井部署，提高单井能力提升32%。（5）发表论文5篇，申报发明专利5件，获软件著作权登记2件，获国家发明二等奖（支撑技术：离散缝洞介质数值模拟技术），获中国石油石化联合会科技进步一等奖，组织国内缝洞型油藏数值模拟会议一次，推进了裂缝数值模等技术的进步。