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      產品展廳>>項目研發>>多段體積壓裂單段壓裂井口壓力壓降模型建立

      頁巖油為致密油藏,常規壓裂增產幅度小、難以達實現高效開發。多段多簇體積壓裂工程工藝技術作為一種新興技術成為頁巖油、低滲油藏增產重要措施,是實現頁巖油經濟開發的重要手段。多段多簇體積壓裂規模大、耗資大,壓裂后如何正確評價和分析措施效果顯得十分的重要。試井技術是確定裂縫半長、裂縫導流能力、地層滲透率、地層壓力等的重要手段,以其工藝簡單、費用低得到了廣泛地應用。

      國內外對常規壓裂試井技術研究很多,試井方法較為完善,但是對頁巖油藏大型體積分段壓裂試井技術研究還處于起步階段嘗試階段,滲流特征認識還不夠深入,還未形成成熟解釋方法。研究開發壓裂改造效果試井評價技術,確定裂縫半長、裂縫導流能力、改造區地層滲透率、地層壓力等,為壓裂設計優化、高效開發成為試井技術需要解決的重要問題。

      針對頁巖油藏開發過程中水平井多段壓裂技術,開展多段體積壓裂單段壓裂井口壓力壓降模型建立。主要技術內容包括:

      單段壓裂評價物理模型和數學模型建立理論方法研究,數學模型求解方法研究,建立壓力響應特征曲線

      壓力響應特征影響因素分析,明確壓力曲線形態特征的主要控制因素,建立分析圖版

      井口-井底壓力折算方法研究,變流量、變密度及變黏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,從而到達確定壓裂井裂縫半長、裂縫導流能力、改造區地層滲透率、地層壓力等資料信息的目的,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。本項目不僅提供了壓裂效果評價手段,也提供了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,并且對這類數據分析無需增加測試成本,具有即時、準確、低成本的技術和經濟優勢。

      Products>>Project Development>>Establishment of wellhead pressure drop model for multi-stage volume fracturing and single-stage fracturing

      Shale oil is a tight reservoir and has low conventional fracturing production, it is difficult to achieve efficient development. As a new technology, multi-stage multi-cluster fracturing engineering technology has become an important measure to increase production of shale oil and low permeability reservoirs, and is an important means to realize the economic development of shale oil. Multi-stage multi-cluster fracturing has large scale and costs, so it is important to evaluate and analyze the effect. Well testing technology is an important means to determine the fracture half length, fracture conductivity, formation permeability, formation pressure and so on. It has been widely applied for its low cost and simple process.

      There are many researches on conventional fracturing well test technology at home and abroad, and the well test method is relatively perfect, but the research on large volume staged fracturing well test technology in shale reservoir is still in the initial stage, the understanding of seepage characteristics is not deep enough, and the mature interpretation method has not been formed. Research and development of well test evaluation technology for fracturing effect, determination of fracture half length, fracture conductivity, formation permeability and formation pressure in the reconstruction area become important problems to be solved for fracturing design optimization and efficient development.

      Aiming at the multi-stage fracturing technology of horizontal wells in the development process of shale reservoir, the wellhead pressure drop model of multi-stage volume fracturing and single-stage fracturing is established. The main technical contents include:

      Study on the establishment of physical model and mathematical model of single-stage fracturing evaluation, study on the theoretical method, study on the solution method of mathematical model, and establish the pressure response characteristic curve.

      By analyzing the influencing factors of pressure response characteristics, the main controlling factors of pressure curve shape characteristics were identified, and the analysis chart was established.

      Research on conversion method of wellhead-bottomhole pressure, calculation method of wellbore vertical pipe flow under variable flow rate, variable density and variable viscosity; mathematical solution of complex vertical pipe flow equation; research on elimination method of pressure data fluctuation caused by water hammer based on filtering theory.

      The influence of wellhead pressure accuracy and stop pump time on the corresponding characteristics of the model is analyzed.

      Study on inversion of measured data and formation parameters method.

      Based on the analysis and study of the construction data during fracturing, this project puts forward the well test analysis method of pump stop pressure drop, and forms the corresponding calculation module, so as to determine the fracture half length, fracture conductivity, formation permeability of reconstruction area and formation pressure of the fracturing well, and provides technical support for the fracturing effect evaluation in the process of shale oil volume fracturing development . This project not only provides a means of fracturing effect evaluation, but also provides a new method of using fracturing data to carry out formation evaluation, which has important application value. Moreover, there is no need to increase the test cost for this kind of data analysis, and it has immediate, accurate and low-cost technical and economic advantages.

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