M气田主力气藏出水分析及治水对策研究

发布时间：2018-05-12 15:33

本文选题：M气田 + 出水规律　；参考：《西南石油大学》2015年硕士论文

【摘要】：目前国内外已探明的大多数气藏均属于不同程度的水驱气藏。气藏水侵会抑制单井产能,增大气藏废弃压力,降低气藏采收率。本文研究课题依托中石油海外天然气勘探开发合作项目,以M气田主力气藏(S气藏和BP气藏)为研究对象。随着气藏开发规模的不断扩大以及气井开采时间的延长,气井出水和气藏水侵逐渐成为制约气藏整体开发效果的主要因素。因此,本文围绕主力气藏水侵问题,开展了气藏概况、气井出水规律、气藏水侵机理与气藏治水对策四个方面的研究,主要完成了以下工作： (1)以主力气藏的地质勘探资料、压力资料与生产动态资料为基础,本文从气藏的地质特征,气层与水层分布特征,气藏连通性及开发现状四个方面进行分析,得出S气藏为孔隙(洞)型的中—高孔渗的正常温压系统的弱边底水气藏,具有统一压力系统；BP气藏为受构造和岩性控制的正常温度、高压—超高压系统的强边底水气藏,东部与西部区块间井间连通性较差,西部区块气井间连通性较好。 (2)整理分析2009～2014年主力气藏生产动态资料,分析得出S气藏气井主要产出凝析水,部分老井井底产生积液；BP气藏投产井均位于西部区块且均保持稳定生产,靠近大断层的气井水气比呈较快上升趋势而导致出水风险增大,东部区块气井由于严重出水而全部停产。气井出水水源类型主要包括凝析水、层内原生可动水、层内次生可动水、边底水以及工作液返排等类型；结合典型出水井生产动态曲线以及主力气藏气井水气比变化特征,总结得出气井出水特征包含四种类型,即少量出水稳产型、少量出水缓慢增高型、中等出水较快增高型与大水量急剧增高型；分析气井积液形成机理,继而针对气藏不同井型(直井与水平井),利用气井临界携液流量模型诊断气井积液情况,优选出李闽模型和Belfroid模型,并根据李闽模型制定出气藏直井积液临界携液流量诊断图版。 (3)基于对气藏储层渗流规律与有水气藏水侵主要影响因素的分析,利用Eclipse数值模拟软件建立了气藏水侵机理模型并开展了影响因素的敏感性分析,研究认为裂缝系统是裂缝—孔隙型气藏水侵的主要决定因素,水体倍数是决定气藏水侵活跃程度的关键,采气速度是控制水侵的主要手段,水平井水平段长度及其避水高度对气藏水侵影响也较大；气藏水侵模式分析认为主要包含三种类型,即水锥型、纵窜型及纵窜横侵型。 (4)基于主力气藏气井出水和气藏水侵现状,在气井出水规律和气藏水侵影响因素敏感性分析所得成果的指导下,分别从气藏角度与单井角度提出了合理的治水对策。通过本文的研究工作,对主力气藏气井出水规律和气藏水侵机理的认识更加充分,进而提出的治水对策对实现M气田主力气藏的合理开发具有重要指导意义,同时也为类似气藏的开发提供借鉴。
[Abstract]:At present, most of the gas reservoirs which have been proved at home and abroad belong to different degree of water drive gas reservoirs. Water invasion of gas reservoir will restrain single well productivity, increase gas reservoir abandonment pressure and reduce gas reservoir recovery. In this paper, based on CNPC overseas natural gas exploration and development cooperation project, the main gas reservoirs in M gas field, S gas reservoir and BP gas reservoir, are taken as the research objects. With the continuous expansion of gas reservoir development scale and the prolongation of gas well production time, gas well effluent and gas reservoir water invasion gradually become the main factors restricting the overall development effect of gas reservoir. Therefore, this paper focuses on the main gas reservoir water invasion problem, the gas reservoir general situation, the gas well effluent law, the gas reservoir water invasion mechanism and the gas reservoir water treatment countermeasure, has mainly completed the following work: 1) based on the geological exploration data, pressure data and production performance data of the main gas reservoir, this paper analyzes the geological characteristics of the gas reservoir, the distribution characteristics of the gas and water layers, the connectivity of the gas reservoir and the present situation of development. It is concluded that the S gas reservoir is a weak edge bottom water gas reservoir with normal temperature and pressure system with pore (hole) type and medium to high porosity and high permeability. The BP gas reservoir with unified pressure system is a normal temperature gas reservoir controlled by structure and lithology, and a strong edge bottom water gas reservoir with high pressure and ultra high pressure system. The interwell connectivity between eastern and western blocks is poor, and that between gas wells in western blocks is better. 2) analyzing the production performance data of main gas reservoir from 2009 to 2014, it is concluded that the main condensate water is produced by gas wells in S gas reservoir, and the production wells of BP gas reservoir are located in the western block and are all in stable production at the bottom of some old wells. The water / gas ratio of the gas wells near the large fault increases rapidly, which leads to the increase of the risk of the effluent, and the gas wells in the eastern block are all shut down because of the serious effluent. The main types of water source of gas well are condensate water, primary movable water in layer, secondary movable water in layer, side and bottom water and working fluid backflow, etc., combined with production performance curve of typical production well and variation characteristics of gas well water / gas ratio in main gas reservoir, It is concluded that the characteristics of gas well effluent include four types, that is, a small amount of steady production of water, a small amount of slow increase of effluent, a rapid increase of medium effluent and a sharp increase of large amount of water, and an analysis of the formation mechanism of gas well effusion, Then according to different well types of gas reservoir (vertical well and horizontal well), the critical fluid carrying flow model of gas well is used to diagnose the fluid accumulation of gas well, and the Li Min model and Belfroid model are selected. According to the model of Li Min, the diagnostic chart of critical liquid carrying rate of gas reservoir is made. Based on the analysis of the percolation law of gas reservoir and the main influencing factors of water invasion in water-bearing gas reservoir, the model of water invasion mechanism of gas reservoir is established by using Eclipse numerical simulation software and the sensitivity analysis of influencing factors is carried out. It is considered that the fracture system is the main determinant of water invasion in the fracture-pore gas reservoir, the water ratio is the key factor to determine the water invasion activity of the gas reservoir, and the gas recovery rate is the main means to control the water invasion. The horizontal section length and water evading height of horizontal well also have great influence on the water invasion of gas reservoir, and the analysis of water invasion mode of gas reservoir shows that there are mainly three types, namely, water cone type, longitudinal channeling type and longitudinal channeling transgression type. 4) based on the current situation of gas well effluent and gas reservoir water invasion in main gas reservoir, under the guidance of the results obtained from the analysis of the gas well effluent law and the sensitivity analysis of gas reservoir water invasion influencing factors, reasonable water control measures are put forward from the gas reservoir angle and the single well angle respectively. Through the research work in this paper, we have a better understanding of the water flow law of the main gas well and the mechanism of water invasion of the main gas reservoir, and then put forward the water control measures which have important guiding significance to realize the rational development of the main gas reservoir in M gas field. At the same time, it also provides reference for the development of similar gas reservoirs.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37

【参考文献】