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产品展厅>>项目研发>>基于压裂停泵数据评价压裂效果研究

随着油气勘探向着复杂、低渗透和非常规储层领域不断开展,直井分段压裂、水平井多段压裂工艺等技术应用越来越广泛。目前页岩油藏普遍采用体积压裂技术实现开发,其中识别裂缝类型及规模是压裂现场急需攻克的国际难题。目前压裂效果评价主要分为三大类,均不能很好地评价压裂效果:

1、物理监测手段:采用微地震、电位监测方法、广域电磁法等实现裂缝识别,但该方法成本高、施工难度大、精度也不高,且无法获得渗透率及地层压力等参数。

2、压后压力恢复测试:页岩储层压力恢复测试不容易获得准确的地层参数和原始地层压力,且获得的裂缝半长参数是多条裂缝的一个平均值,对压裂效果的刻画不够细致。

3、压后试采数据分析:生产数据中的地面压力和流量波动大,而且井筒多相管流使得压力折算有较大的误差,且压后较长时间才能实施,这也导致返排数据分析方法难以获得准确的地层参数。

为了更好地提高储层勘探开发效果,对压裂效果开展评价分析,现场急需提出一种即时、准确、低成本的裂缝识别方法。

基于停泵压力数据的页岩气井压裂裂缝评价方法研究

国内外非常规油气藏压裂评价方法调研与应用案例剖析

压裂停泵数据分析方法在川南深层页岩气井适应性分析

非常规油气藏压裂停泵数据分析模型优化

非常规油气藏压裂停泵数据模型求解方法研究

页岩气井停泵数据评价方法现场应用

非常规油气藏压裂停泵数据分析方法现场试验

实施效果评价与分析方法优化

四川盆地海相页岩气资源主要蕴藏在埋深大于3500m的深层,储层具有埋藏深度大(大于3500m)、高温(大于100℃)、高压(大于70MPa)的特征,普遍采用多段压裂水平井进行开发,单井开发成本超过3000万元。为了稳定高效的开采页岩气,需要对压裂效果进行评价,进而制定合理的后续焖井返排制度。 

通过本项目形成的压裂停泵数据分析方法,仅需在压裂过程中在井口安装压力计全程记录压裂过程中的压力数据,后续采用数据分析的方法就可以评价压裂规模,不仅成本远低于微地震等物理手段且操作简单方便。同时由于方法可以提供裂缝半长、渗透率等参数,还能够指导后期焖井和返排方案,合理规划产气制度。

Products>>Project Development>>Evaluation of fracturing effect based on fracturing pump shutdown data

With the continuous development of oil and gas exploration towards complex, low permeability and unconventional reservoirs, technologies such as vertical well staged fracturing and horizontal well multi-stage fracturing are more and more widely used. At present, shale reservoirs are generally developed by volume fracturing technology, in which identifying fracture type and scale is an international problem that needs to be solved in-field. At present, the fracturing effect evaluation is mainly divided into three categories, which can not evaluate the fracturing effect well:

(1) Physical monitoring means: micro seismic, potential monitoring method and wide area electromagnetic method are used to realize fracture identification, but this method has high cost, difficult construction, low accuracy, and can not obtain parameters such as permeability and formation pressure.

(2) Post fracturing pressure recovery test: it is not easy to obtain accurate formation parameters and original formation pressure in the pressure recovery test of shale reservoir, and the fracture half-length parameter obtained is an average value of multiple fractures,  so the description of fracturing effect is not detailed enough.

(3) Post fracturing data analysis: the ground pressure and flow in the production data fluctuate greatly, and the wellbore multiphase pipe flow makes the pressure conversion have a large error, and it can be implemented for a long time after fracturing, which also makes it difficult for the flowback data analysis method to obtain accurate formation parameters. 

In order to better improve the effect of reservoir exploration and development and evaluate and analyze the fracturing effect, it is urgent to put forward a real-time, accurate and low-cost fracture identification method on site.

Study on fracturing fracture evaluation method of shale gas well  based on stop pump pressure data.

Investigation and application case analysis of fracturing evaluation methods of unconventional oil and gas reservoirs at home and abroad.

Adaptability analysis of fracturing pump stop data analysis method in deep shale gas wells in South Sichuan.

Optimization of fracturing pump stop data analysis model for  unconventional oil and gas reservoirs.

Study on solving method of fracturing pump stop data model in   unconventional oil and gas reservoir.

Field application of data evaluation method of shale gas well  pump shutdown.

Field test of fracturing pump stop data analysis method for unconventional oil and gas reservoir.

Implementation effect evaluation and analysis method optimization.

Marine shale gas resources in Sichuan Basin are mainly contained in deep layers with burial depth greater than 3500m. The reservoir has the characteristics of large burial depth (greater than 3500m), high temperature (greater than 100 ℃) and high pressure (greater than 70MPa). Multi-stage fracturing horizontal wells are widely used for development, and the  development cost of a single well exceeds 30 million yuan. In order to stably and efficiently exploit shale gas, it is necessary to evaluate the fracturing effect and formulate a reasonable shut-in and flowback system.

Through the fracturing pump shutdown data analysis method formed in the project, it is only necessary to install a pressure gauge at the wellhead during the fracturing process to record the pressure data in the whole process, and the subsequent data analysis method can be used to evaluate the fracturing scale, which is not only much lower than the physical means such as micro-seismic, but also simple and convenient to operate. At the same time, because the method can provide parameters such as fracture half-length and permeability, it can also guide the shut-in and flowback scheme in the later stage, and reasonably plan the gas production system.

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