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              產品展廳>>項目研發>>高頻壓力全過程監測及評價技術

              目前我國壓裂分析對于壓裂生產中射孔簇是否全部打開,裂縫規模、流動參數,排采制度等情況都沒有很明確的認識,雖然有國外的相關軟件支持,但是技術原理,應用條件都不清楚,實際應用容易水土不服,并且核心技術算法被壟斷,面臨卡脖子的問題。我公司利用多年積累的算法代碼,形成了高頻壓力全過程監測及評價技術,實現了壓裂現場數據的監測與分析。

              我公司研發了高頻壓力監測設備,在現場進行安裝監測,數據由云端傳送到高性能計算中心,實現快速計算。主要技術內容包括:

              壓力監測:井口四通閥上安裝高頻壓力計,毫秒級高頻測壓,數據直傳電腦。

              壓裂停泵解釋:根據每段施工曲線和施工簡況,結合壓裂設計資料,和高頻壓力數據,對所有壓裂段進行壓裂停泵解釋,得到每段的裂縫長度、裂縫高度、滲透率及注入液體后的地層附近平均壓力等,并給出壓裂SRV區域大小。

              進液點倒譜分析:根據壓裂中的水擊效應和測得的高頻壓力,基于波動信號進行倒譜分析,給出進液點情況,即該段每簇是否形成裂縫,暫堵效果,橋塞密封情況,以及是否存在漏液等。

              壓后燜井分析:燜井期間持續測壓,定期分析壓力數據,得到地層裂縫閉合趨勢,評估壓裂液是否擴展到地層最遠端,到達地層邊界,并結合壓力變化模擬,給出悶井持續天數或返排開始時間。

              返排制度優化:在開井后的返排試采期間,根據每天的氣水產量和壓力變化情況,綜合分析當前油嘴及井底壓力和生產壓差變化情況,得到裂縫閉合情況,滲透率變化情況,并給出油嘴更換建議,優化返排制度,根據返排后期數據計算產能,評估可采儲量。

              本項目實現了壓裂返排及采油全過程遠程壓力監測,得到進液點位置、橋塞漏失性、地層滲透性、裂縫縫網形態、壓后地層壓力,SRV體積等解釋結果,并且可以做后續的悶井返排分析。能夠準確預測頁巖氣井出氣時間,保障生產安全,給出頁巖氣井更換油嘴理論依據,預測頁巖氣井的EUR、無阻流量、含水飽和度變化及產能。安裝方便,實用性強,在技術和實際應用中具有很強的競爭優勢。

              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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