沁水盆地郑庄区块煤层气井压裂排采效果与影响因素分析

发布时间：2018-06-25 10:00

本文选题：郑庄区块 + 煤层气　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：沁水盆地南部是我国煤层气开发利用最为成功的地区之一,但开发实践过程中,不少煤层气井出现了产气不足、产水量大、产气衰减快等现象,急需要针对性地开展郑庄区块煤层气井压裂、排采效果和地质影响因素之间的配伍关系研究。本文以郑庄区块上千口开发井的基础地质资料、压裂施工数据和排采数据为基础,从定性和定量两个方面综合分析了研究区影响压裂、排采效果的地质因素,提出了系统的压裂、排采效果评价方案,研究成果可有效指导该区煤层气开发。基于284 口井压裂曲线的系统分析,将郑庄区块压裂曲线按照油压曲线、砂比曲线和排量曲线形态,依次划分为稳定型、稳定波动型、下降型和波动型4种,对应压裂效果由好变差。在工程条件差别不大的情况下,研究区气井压裂效果受多种地质因素影响。其中煤体结构是主控因素,构造条件和地应力次之,三者通过影响压裂裂缝形态和扩展方式影响压裂效果。在原生煤较厚,构造变形少的地区进行压裂改造可以起到最好的效果。基于284 口井排采曲线的系统分析,将郑庄区块排采曲线按照排采效果由好变差,依次划分为稳定型、上升型、衰减型和波动型四种。研究区气井排采受到工程因素和地质因素的综合影响,其中构造条件、含气量和动液面降速是主要因素,煤层埋深是次要因素。在构造变形少、含气量大的区域进行煤层气排采可以起到最好的效果。根据对压裂、排采的分析,将研究区划分为6个主要区域。研究区西部和西北部是煤层气开发的最优选区,中部和东部为较优选区,南部和东北部为差选区。基于人工神经网络算法对研究区煤层气井见气时间和累计产气量进行了神经网络预测,预测误差较小。说明研究区煤层气井排采典型参数之间具有良好的关联性。
[Abstract]:The southern Qinshui Basin is one of the most successful areas in China for the development and utilization of coalbed methane. However, in the course of development practice, many coalbed methane wells have some phenomena, such as insufficient gas production, large water production, fast gas production attenuation and so on. It is urgent to study the compatibility of coalbed methane well fracturing, production expulsion and geological factors in Zhengzhuang block. Based on the basic geological data, fracturing operation data and production discharge data of thousands of development wells in Zhengzhuang block, this paper synthetically analyzes the geological factors affecting fracturing and production expulsion in the study area from two aspects of qualitative and quantitative analysis. A systematic evaluation scheme of fracturing and drainage effect is put forward, and the research results can effectively guide the development of coalbed methane in this area. Based on the systematic analysis of fracturing curves in 284 wells, the fracturing curves in Zhengzhuang block are divided into four types according to oil pressure curve, sand ratio curve and displacement curve, which are stable type, stable wave type, descending type and fluctuating type. The corresponding fracturing effect is changed from good to bad. In the case of little difference in engineering conditions, the fracturing effect of gas wells in the study area is affected by many geological factors. The coal structure is the main controlling factor, the structural condition and the in-situ stress are the second, and the three factors affect the fracturing effect by influencing the fracturing fracture morphology and expansion mode. Fracturing in areas with thicker primary coal and less structural deformation can achieve the best results. Based on the systematic analysis of 284 wells, the drainage curve of Zhengzhuang block is divided into four types: stable type, rising type, attenuation type and fluctuating type. The comprehensive influence of engineering factors and geological factors on gas well drainage and production in the study area is obtained. Among them, the structural conditions, gas content and dynamic liquid surface velocity are the main factors, and the coal seam burial depth is the secondary factor. Coal bed methane extraction in areas with low tectonic deformation and high gas content can achieve the best results. According to the analysis of fracturing and drainage, the study area is divided into 6 main areas. The west and northwest of the study area are the optimal districts for coalbed methane development, the middle and east are better, and the south and northeast are poor. Based on the artificial neural network (Ann) algorithm, the detection time and cumulative gas production of coalbed gas wells in the study area are predicted by neural network, and the prediction error is small. It shows that there is a good correlation between typical parameters of coalbed methane well in the study area.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE377

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