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            產品展廳>>項目研發>>2022年頁巖油(氣)停泵數據分析方法和壓裂效果評價技術研究

            目前壓裂效果評價主要分為微地震及電位監測、壓后壓力恢復測試、壓后試采數據分析三大類,由于現有的資料不能很好地評價壓裂效果,為此本項目針對我國頁巖油(氣)地質特征和體積壓裂條件,從停泵壓裂數據的角度出發,形成了停泵壓降試井分析方法。

            該方法具有如下特點:首先測量地面注入流體排量、地面壓力及砂比數據;裂縫起裂后流體在縫中流動及地層滲流等過程互相耦合,不同的裂縫形態、裂縫半長及地層參數都影響地面壓力;通過研究合適的解釋評價方法,可反演出裂縫中的關鍵參數。并且壓裂期間壓裂液使得裂縫起裂、擴展和延伸,同時還漏失進地層,因此地面排量、壓力及砂比數據不僅反映裂縫信息,而且還包含地層參數及原始地層壓力等。

            我公司自主研發了停泵壓降數據分析方法,可對壓裂改造效果進行評估,主要技術內容包括:

            建立單段壓裂評價物理模型和數學模型,對數學模型求解方法進行研究,建立壓力響應特征曲線。

            壓力相應特征影響因素分析,明確壓力曲線形態特征的主要影響因素,建立分析圖版。

            井口-井底壓力折算方法研究,變流量變密度及變粘度下的井筒垂直管流計算方法研究;復雜垂直管流的方程數學求解;濾波理論的消除水錘引起的壓力數據波動方法研究。

            井口壓力精度和停泵時間對模型相應特征影響分析。

            實測數據反演及地層參數方法研究。

            本項目通過對壓裂期間施工數據的分析研究,提出了停泵壓降試井分析方法,并形成了相應的計算模塊,為頁巖油體積壓裂開發過程中的壓裂效果評價提供了技術保障。軟件通過測量地面注入流體排量、地面壓力及砂比數據,進行解釋分析,無需增加測試成本,是一種采用壓裂數據開展地層評價的新方法,具有重要的應用價值。

            Products>>Project Development>>Study on the influence of volume fracturing boundary and seepage characteristics of dense reservoir

            At present, the exploration targets and key research objects of the oilfield are mainly dense reservoirs. For such reservoirs, it is often necessary to carry out reservoir reconstruction, well pattern infilling and other measures through multi-stage hydraulic fracturing in long horizontal wells to improve oil and gas production and realize efficient and economic development. However, multi-stage fracturing of horizontal wells is a world-class problem and a technical bottleneck restricting the application of horizontal wells in low-permeability reservoirs. The key technologies are: studying horizontal well reservoir engineering to solve the problem of horizontal well layout; Study the in-situ stress field to solve the problems of hydraulic fracture initiation and shape; Study the optimal design of staged fracturing in horizontal section to solve the problem of multi-stage fracture setting; Study the staged fracturing technology and tools to solve the implementation problem of staged fracturing in horizontal wells; Crack monitoring is studied to solve the problem of multi-stage crack evaluation.

            Establishment and solution of mathematical model for large-scale volume fracturing

            Influence of seepage law in volume fracturing zone and undisturbed formation of horizontal well on well test model

            Study on dense non-Darcy seepage: The influence of start-up pressure gradient on flow is analyzed

            Study on the method of determining formation parameters by data inversion and analysis of influencing factors

            The mathematical model of injection and production seepage resistance and the formula of pressure-distance under different liquid volume are studied, and the characteristic curve is analyzed

            Productivity analysis and prediction calculation model and productivity curve using unstable well test data

            The project has made a breakthrough in the research of tight multi-stage fracturing horizontal well test technology, and proposed a tight well test analysis method, which provides a technical guarantee for well test evaluation in the process of shale oil volume fracturing development. The effective combination of model establishment, model solution and production application is realized. The interpretation provides parameters such as formation permeability, well storage constant, skin coefficient, fracture half-length and start-up pressure. The field application effect is good.

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