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产品展厅>>项目研发>>高频压力全过程监测及评价技术

目前我国压裂分析对于压裂生产中射孔簇是否全部打开,裂缝规模、流动参数,排采制度等情况都没有很明确的认识,虽然有国外的相关软件支持,但是技术原理,应用条件都不清楚,实际应用容易水土不服,并且核心技术算法被垄断,面临卡脖子的问题。我公司利用多年积累的算法代码,形成了高频压力全过程监测及评价技术,实现了压裂现场数据的监测与分析。

我公司研发了高频压力监测设备,在现场进行安装监测,数据由云端传送到高性能计算中心,实现快速计算。主要技术内容包括:

压力监测:井口四通阀上安装高频压力计,毫秒级高频测压,数据直传电脑。

压裂停泵解释:根据每段施工曲线和施工简况,结合压裂设计资料,和高频压力数据,对所有压裂段进行压裂停泵解释,得到每段的裂缝长度、裂缝高度、渗透率及注入液体后的地层附近平均压力等,并给出压裂SRV区域大小。

进液点倒谱分析:根据压裂中的水击效应和测得的高频压力,基于波动信号进行倒谱分析,给出进液点情况,即该段每簇是否形成裂缝,暂堵效果,桥塞密封情况,以及是否存在漏液等。

压后焖井分析:焖井期间持续测压,定期分析压力数据,得到地层裂缝闭合趋势,评估压裂液是否扩展到地层最远端,到达地层边界,并结合压力变化模拟,给出闷井持续天数或返排开始时间。

返排制度优化:在开井后的返排试采期间,根据每天的气水产量和压力变化情况,综合分析当前油嘴及井底压力和生产压差变化情况,得到裂缝闭合情况,渗透率变化情况,并给出油嘴更换建议,优化返排制度,根据返排后期数据计算产能,评估可采储量。

本项目实现了压裂返排及采油全过程远程压力监测,得到进液点位置、桥塞漏失性、地层渗透性、裂缝缝网形态、压后地层压力,SRV体积等解释结果,并且可以做后续的闷井返排分析。能够准确预测页岩气井出气时间,保障生产安全,给出页岩气井更换油嘴理论依据,预测页岩气井的EUR、无阻流量、含水饱和度变化及产能。安装方便,实用性强,在技术和实际应用中具有很强的竞争优势。

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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