官寨井田合层采气地质因素约束研究

发布时间：2018-03-19 15:08

  本文选题：官寨井田　切入点：合层采气　出处：《煤炭科学研究总院》2017年硕士论文　论文类型：学位论文

【摘要】：在多煤层发育地区,合层采气是降低煤层气开发成本、提高产能的重要手段,然而在合层采气过程中,层间干扰的存在,制约着煤层气井的排采效果。十三五煤层气规划重点开发区块内的官寨井田,煤层层数多、厚度薄、成群分布,深入研究官寨井田合层采气的地质因素约束条件意义重大。本文依托十三五国家科技重大专项课题(2016ZX05045-002),在大量调研国内外煤层气井产能影响因素、层间干扰等研究的基础上,对影响合层采气的地质敏感性进行了分析,总结出地质敏感因素包括:储层压力体系、临界解吸压力、渗透率和水文地质条件。结合官寨井田的地质特点,确定了官寨井田合层采气的主控因素为储层压力差、临界解吸压力差和渗透率比值,在此基础上,利用数值模拟手段,调整不同因素的差异范围,提出了不同煤层组合条件下各因素的约束范围。通过多因素分析,结合三个主控因素约束范围的研究成果,优选出官寨井田适合合层采气的多因素组合方案。其中煤组1和煤组2在官寨井田地质条件物性差异范围内,均适合合层采气;煤组2和煤组3的储层压力差△P≤0.3MPa,临界解吸压力差在-0.3～0.5MPa范围内,渗透率比值在官寨井田地质条件的差异范围内时,适合合层采气;煤组1和煤组3的储层压力差△P≤0.6MPa,临界解吸压力差在官寨井田地质条件的差异范围内,渗透率比值在2:1～4:1范围内时,适合合层采气;并讨论了影响不同煤层组合合层采气的关键因素,为后续多煤层合层采气奠定了理论基础。分析了 GZ-01井的煤层气地质条件,优选出GZ-01井的最佳煤层组合,结合该井的排采效果,验证了研究成果的正确性和实用性,为官寨井田合层采气的煤层组合优选奠定理论基础。
[Abstract]:In the area of multi-seam development, combined bed gas production is an important means to reduce the development cost of coalbed methane and improve productivity. However, in the process of gas production, interlayer interference exists. Guanzhai well in the key development block of the 13th Five-Year Plan for coalbed methane has a large number of coal beds, thin thickness, and distribution in groups. It is of great significance to study the constraints of geological factors on gas recovery in Guanzhai coalmine field. Based on the important national scientific and technological project 2016ZX05045-002, this paper, on the basis of a large number of researches on the factors affecting the productivity of coalbed methane wells at home and abroad, interlayer interference, etc., Based on the analysis of the geological sensitivity affecting gas recovery in the combined reservoir, it is concluded that the geological sensitive factors include: reservoir pressure system, critical desorption pressure, permeability and hydrogeological conditions, combined with the geological characteristics of Guanzhai well field. The main controlling factors of gas recovery in Guanzhai mine field are reservoir pressure difference, critical desorption pressure difference and permeability ratio. On this basis, the difference range of different factors is adjusted by means of numerical simulation. This paper puts forward the constraint range of each factor under different coal seam combination conditions. Through multi-factor analysis, combining with the research results of three main controlling factors, The multifactor combination scheme of Guanzhai mine field suitable for gas recovery of combined layer is selected. The coal group 1 and coal group 2 are suitable for gas recovery in combination layer in the range of physical properties difference of geological conditions in Guanzhai mine field. The reservoir pressure difference P 鈮，

本文编号：1634802