产品展厅>>项目研发>>断熔体油藏试井解释新方法可行性研究

碳酸盐岩油藏的缝洞描述方法与常规砂岩油藏有着很大的区别,油藏认识、改造措施及开发难度极大。本项目摒弃传统试井解释,意在研究一套新的缝洞型油藏试井解释理论方法,从连续介质力学满足的三大守恒定律(质量守恒、动量守恒及能量守恒)出发,充分考虑地层中基岩、裂缝及溶洞的特征,建立相应的流动方程,寻找流动方程的求解方法,开展塔河油田奥陶系缝洞型油藏试井分析方法研究,为缝洞型油藏试井解释提供理论依据。

利用三大守恒定律建立起井筒-溶洞-地层的流动方程,解决了井筒-溶洞联通的缝洞型油藏试井分析问题。

首次提出洞中的压力变化是流动和压力波动的耦合概念,给出了流动和压力波动耦合下压力满足的方程,求解得到洞和井筒中的压力差表达式。

将地层中的溶洞考虑为源汇项,通过试井分析解释出源汇强度及离井筒的距离。采用油藏工程方法将源汇强度转化为洞的体积。

提出了缝洞型油藏试井解释方法:建立了井-洞、井-洞-洞及井-洞-缝-洞三类碳酸盐介质的试井模型,获得试井分析图版和试井分析方法。

随着碳酸岩油藏的开发和开采,缝洞型油藏试井分析及产能评价越来越受到关注,相关的研究论文也不断涌现。国内外虽然对碳酸岩油藏试井及产能进行大量而广泛的学术研究,但还不能解决目前实际油田中的碳酸岩压力恢复试井分析问题,商业软件中也只有部分简化的三重介质模型。

本项目另辟新径,将洞中的流动视作为波动与流动耦合;因洞半径远大于井筒半径,洞流到井筒中采用能量守恒;对地层中的洞处理为源汇,从而将碳酸盐岩油气藏试井问题简化为“井—洞”、“井—洞—洞”及“井—洞—缝—洞”问题加以建模和求解。

研究成果及技术政策适用于整个碳酸盐岩缝洞型油藏试井分析,对于了解碳酸盐岩缝洞型油藏缝洞结构及分布,合理有效的产能预测,改造低(无)效井,具有重要的指导意义,推广价值高。

Products>>Project Development>>Feasibility of New well testing interpretation method for Fault Melt Reservoir

The fracture-hole description method of carbonate reservoir is different from that of conventional sandstone reservoir, the reservoir understanding, exploration and development are very difficult. This project abandons the traditional well testing interpretation, and intends to study a new set of theories and methods of well testing interpretation for fracture-hole reservoir. Starting from the three conservation laws satisfied by continuum mechanics (mass conservation, momentum conservation and energy conservation), fully considering the characteristics of bedrock, fracture and hole in formation, establishing the corresponding flow equation and finding the solution method of flow equation. The well testing analysis method of Ordovician fracture-hole reservoir in Tahe Oilfield is carried out, which provides a theoretical basis for well testing interpretation of fracture-hole reservoir.

The flow equations of wellbore, hole and formation are established by using three conservation laws, and the problem of well testing analysis of fracture reservoir that wellbore-hole connected is solved.

The theory pressure change in the hole is the coupling of flow and pressure fluctuation is presented for the first time, the equation of pressure satisfaction under the coupling of flow and pressure fluctuation is given, and the expression of pressure difference between hole and wellbore is obtained.

The hole in the formation is considered as the source sink term, and the strength of the source sink and the distance to the wellbore are explained by well testing analysis. The source and sink strength is transformed into the volume of the hole by reservoir engineering method.

The well testing interpretation method of fracture-hole reservoir is put forward. The well testing models of well-hole, well-hole-hole and well-hole-fracture-hole are established, and the well testing analysis char/method are obtained.

With the development and production of carbonate reservoirs, well testing analysis and productivity evaluation of fracture-hole reservoirs have attracted more and more attention, and related research papers have emerged. Although a large number of academic research has been carried out on well testing and productivity of carbonate reservoirs domestic and abroad, it can not solve the problem of carbonate pressure recovery well testing analysis in actual oil fields at present, and there is only a partially simplified triple medium model in commercial software.

In this project, the flow in the hole is regarded as the coupling of wave and flow; because the radius of the hole is much larger than the radius of the wellbore, the energy conservation is adopted when fluid flow from the hole to the wellbore; the hole in the formation is treated as the source and sink, so that the well testing problem of carbonate reservoir is simplified as "well-hole", "well-hole-hole" and "well-hole-fracture-hole".

The research results and technical policies are suitable for the well testing analysis of the whole carbonate fracture-hole reservoir, which has important guiding significance and high popularizing value for understanding the fracture-hole structure and distribution of carbonate fracture-hole reservoir, reasonable and effective productivity prediction, and reforming low (no) effective well.