海上低渗致密H气藏有效开发方式及开发下限研究

发布时间：2018-02-24 22:01

本文关键词： 低渗致密气藏有效开发方式压裂水平井隔夹层开发下限　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：低渗致密气藏是指储层孔渗物性差,需采取特殊井型和一定的增产工艺措施,才能投入经济有效开发的气藏。由于低渗透致密气藏存在低孔、低渗透、低产等不利开发因素,使得不少低渗气藏处于经济效益开发的边沿,或处于没有开发价值而无法经济有效动用的状态,尤其是开发成本很高的海上低渗透致密气藏,要实现经济有效开发需要探讨和解决更多的经济技术难题。海上低渗致密H气藏具有低渗致密气藏开发的普遍难点:①.储量规模小、分布散乱,开发难度大;②.储层物性差、连通性复杂,存在薄互层现象;③.孔喉比高,易水锁;④.可动水饱和度高,气藏产水严重;⑤.气井开发成本高,对单井的产能要求高。本文针对海上低渗致密H气藏开发所面临的问题,论证了该气藏的最优开发模式,并基于当前的经济技术条件研究了气藏的开发下限,为气藏开发方式及开发区域的选择提供了可靠地依据,其研究成果也为低渗致密气藏的经济开发研究提供了重要参考与思路。论文主要取得了以下成果:(1)在归纳总结海上低渗致密H气藏基本地质特征的基础上,分析了气藏天然气的渗流特征,确定了启动压力梯度、废弃压力、理论产能等。(2)应用气藏工程理论与方法及数值模拟技术,研究了低渗致密H气藏的有效开发方式,提出了不同地质条件下气藏开发方式的选择。(3)针对低渗致密H气藏存在隔夹层的情况,利用数值方法研究了不同类型隔夹层对产能的影响,并在此基础上提出了在进行水平井压裂时,应优先确保裂缝条数,其次再考虑裂缝半长的结论。(4)根据低渗气田的开发特点,综合考虑产能影响因素,确定了开发下限综合参数,建立了适合低渗致密气田的经济评价方式,并以经济开发为约束条件,研究了气田在不同开发方式下的经济开发下限图版。
[Abstract]:The low permeability tight gas reservoir refers to the reservoir with poor physical properties of pore and permeability, which requires special well type and certain measures to increase production in order to be put into the economic and effective development of the gas reservoir. Due to the low porosity, low permeability, low production and other unfavorable development factors in the low permeability tight gas reservoir, Many low permeability gas reservoirs are at the edge of economic development, or in a state where there is no development value and can not be used economically and effectively, especially the offshore low permeability tight gas reservoirs, which have high development costs. In order to realize economic and effective development, more economic and technical problems need to be explored and solved. The offshore low permeability tight H gas reservoir has the common difficulty of low permeability tight gas reservoir development: 1. The reserve scale is small, the distribution is scattered, the development is difficult, and the reservoir physical property is poor. The connectivity is complex, the phenomenon of thin interlayer exists 3, the ratio of pore to throat is high, the easy water is locked, the saturation of movable water is high, the water production of gas reservoir is serious, and the development cost of gas well is high. In view of the problems in the development of offshore low permeability tight H gas reservoir, the optimal development model of this gas reservoir is demonstrated, and the lower limit of gas reservoir development is studied based on the current economic and technical conditions. It provides a reliable basis for the selection of gas reservoir development mode and development area. The research results also provide an important reference and train of thought for the economic development of low permeability tight gas reservoirs. In this paper, the following achievements are obtained: 1) on the basis of summarizing the basic geological characteristics of low permeability dense H gas reservoirs at sea, In this paper, the percolation characteristics of natural gas reservoir are analyzed, and the starting pressure gradient, abandonment pressure, theoretical productivity, etc.) based on the engineering theory and method of gas reservoir and numerical simulation technology, the effective development mode of low permeability tight H gas reservoir is studied. The selection of gas reservoir development mode under different geological conditions is put forward. Aiming at the existence of intercalation in low permeability tight H gas reservoir, the influence of different types of intercalation on productivity is studied by numerical method. On the basis of this, the conclusion that the number of fractures should be ensured first and the half length of fractures should be taken into account when fracturing horizontal wells is put forward.) according to the development characteristics of low permeability gas fields and comprehensive consideration of the factors affecting productivity, the comprehensive parameters of the lower limit of development are determined. The economic evaluation method suitable for low permeability tight gas field is established and the lower limit chart of economic development of gas field under different development modes is studied with economic development as the constraint condition.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE53

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