產品展廳>>項目研發>>斷熔體油藏試井解釋新方法可行性研究

碳酸鹽巖油藏的縫洞描述方法與常規砂巖油藏有著很大的區別,油藏認識、改造措施及開發難度極大。本項目摒棄傳統試井解釋,意在研究一套新的縫洞型油藏試井解釋理論方法,從連續介質力學滿足的三大守恒定律(質量守恒、動量守恒及能量守恒)出發,充分考慮地層中基巖、裂縫及溶洞的特征,建立相應的流動方程,尋找流動方程的求解方法,開展塔河油田奧陶系縫洞型油藏試井分析方法研究,為縫洞型油藏試井解釋提供理論依據。

利用三大守恒定律建立起井筒-溶洞-地層的流動方程,解決了井筒-溶洞聯通的縫洞型油藏試井分析問題。

首次提出洞中的壓力變化是流動和壓力波動的耦合概念,給出了流動和壓力波動耦合下壓力滿足的方程,求解得到洞和井筒中的壓力差表達式。

將地層中的溶洞考慮為源匯項,通過試井分析解釋出源匯強度及離井筒的距離。采用油藏工程方法將源匯強度轉化為洞的體積。

提出了縫洞型油藏試井解釋方法:建立了井-洞、井-洞-洞及井-洞-縫-洞三類碳酸鹽介質的試井模型,獲得試井分析圖版和試井分析方法。

隨著碳酸巖油藏的開發和開采,縫洞型油藏試井分析及產能評價越來越受到關注,相關的研究論文也不斷涌現。國內外雖然對碳酸巖油藏試井及產能進行大量而廣泛的學術研究,但還不能解決目前實際油田中的碳酸巖壓力恢復試井分析問題,商業軟件中也只有部分簡化的三重介質模型。

本項目另辟新徑,將洞中的流動視作為波動與流動耦合;因洞半徑遠大于井筒半徑,洞流到井筒中采用能量守恒;對地層中的洞處理為源匯,從而將碳酸鹽巖油氣藏試井問題簡化為“井—洞”、“井—洞—洞”及“井—洞—縫—洞”問題加以建模和求解。

研究成果及技術政策適用于整個碳酸鹽巖縫洞型油藏試井分析,對于了解碳酸鹽巖縫洞型油藏縫洞結構及分布,合理有效的產能預測,改造低(無)效井,具有重要的指導意義,推廣價值高。

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.

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