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产品展厅>>项目研发>>2022年页岩油(气)停泵数据分析方法和压裂效果评价技术研究

目前压裂效果评价主要分为微地震及电位监测、压后压力恢复测试、压后试采数据分析三大类,由于现有的资料不能很好地评价压裂效果,为此本项目针对我国页岩油(气)地质特征和体积压裂条件,从停泵压裂数据的角度出发,形成了停泵压降试井分析方法。

该方法具有如下特点:首先测量地面注入流体排量、地面压力及砂比数据;裂缝起裂后流体在缝中流动及地层渗流等过程互相耦合,不同的裂缝形态、裂缝半长及地层参数都影响地面压力;通过研究合适的解释评价方法,可反演出裂缝中的关键参数。并且压裂期间压裂液使得裂缝起裂、扩展和延伸,同时还漏失进地层,因此地面排量、压力及砂比数据不仅反映裂缝信息,而且还包含地层参数及原始地层压力等。

我公司自主研发了停泵压降数据分析方法,可对压裂改造效果进行评估,主要技术内容包括:

建立单段压裂评价物理模型和数学模型,对数学模型求解方法进行研究,建立压力响应特征曲线。

压力相应特征影响因素分析,明确压力曲线形态特征的主要影响因素,建立分析图版。

井口-井底压力折算方法研究,变流量变密度及变粘度下的井筒垂直管流计算方法研究;复杂垂直管流的方程数学求解;滤波理论的消除水锤引起的压力数据波动方法研究。

井口压力精度和停泵时间对模型相应特征影响分析。

实测数据反演及地层参数方法研究。

本项目通过对压裂期间施工数据的分析研究,提出了停泵压降试井分析方法,并形成了相应的计算模块,为页岩油体积压裂开发过程中的压裂效果评价提供了技术保障。软件通过测量地面注入流体排量、地面压力及砂比数据,进行解释分析,无需增加测试成本,是一种采用压裂数据开展地层评价的新方法,具有重要的应用价值。

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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