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产品展厅>>项目研发>>致密储层体积压裂边界影响及渗流特征研究

目前油田勘探目标和攻关对象主要是致密储层,对于此类储层,往往需要在长水平井中通过多级水力压裂进行储层改造、井网加密和其他措施以提高油气产量,实现高效经济开发。然而,水平井多段压裂改造是世界级难题,也是制约水平井在低渗储层应用的技术瓶颈,其关键技术在于:研究水平井油藏工程以解决水平井布井难题;研究就地应力场以解决水力裂缝起裂及形态问题;研究水平段分段压裂优化设计以解决多段裂缝设置问题;研究分段压裂工艺和工具以解决水平井分段压裂的实施问题;研究裂缝监测以解决多段裂缝评估问题。

国内外对常规压裂试井技术研究很多,试井方法较为完善,但是对致密多段压裂水平井试井技术研究还处于发展阶段,渗流特征认识还不够深入,还未形成成熟解释方法。因此研究开发致密储层试井分析方法成为目前试井应用方面需要解决的重要问题。

大规模体积压裂数学模型建立及求解研究

水平井体积压裂改造区和原状地层渗流规律对试井模型影响

致密非达西渗流研究,分析启动压力梯度对流动的影响

数据反演确定地层参数方法研究及影响因素分析

注采渗流阻力研究数学模型及不同液量下压力-距离的公式,并进行特征曲线分析

利用不稳定试井资料进行产能分析预测计算模型及产能曲线

该项目对致密多段压裂水平井试井技术研究取得了突破,提出了致密试井分析方法,为页岩油体积压裂开发过程中的试井评价提供了技术保障。并且实现了模型建立-模型求解-生产应用的有效结合,解释提供了地层渗透率、井储常数、表皮系数、裂缝半长、启动压力等参数,现场应用效果良好。

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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