【作者】 伍文明；

【导师】 冯文光；

【作者基本信息】 成都理工大学 ， 油气田开发工程， 2008， 硕士

【摘要】 随着天然气生产规模的扩大,产水气井逐年增多,有水气藏的开发对策研究日益受到重视。靖边气田下古气藏具有低压、低渗、低丰度、非均质性强等特点,本文围绕南二区马五气藏开发上存在的实际问题,利用地质、测井、测试及生产动态资料,开展了相对富水区分布规律和气藏工程研究。通过本次研究,取得了以下进展:(1)对南二区内生产井进行生产动态资料和地质分析认识,结合气藏工程研究,提出地层水的判别方法,在此基础上对产水井出水机理和生产动态规律进行了分析。(2)根据长庆靖边气田马五储层物性和气水分布情况,研究相对富水区分布规律及其对开采的影响因素,认为“相对富水区”分布受控于区域构造、局部构造、储层条件变化带的遮挡(包括溶蚀沟槽的影响)等因素。(3)从临界携液产气量的单因素影响分析中可知,临界携液流量随着油管内径的缩小而降低,那么对于携液能力不足的产水气井,可以考虑采取更换小直径油管的方法排水采气,保持产量在大于临界携液流量的条件下进行连续生产,使气井继续利用自身能量连续带水采气。(4)针对靖边气田南二区气藏特征,以马五储层为模型,结合生产动态资料,开展气藏数值模拟研究,提出合理开发规模和预测气田开发动态,提出的主要开采技术对策有:①对水体能量有限的“相对富水区”,在生产中尽量保证日产气量大于最小携液产气量,依靠自身能量排水产气;②对于较大的“相对富水区”,在水区内部应采用排水采气降低地层压力,在富水区边缘控制产量生产,保持富水区与周围地区的压力平衡,达到控水产气的目的;③分析认为目前井网不完善,可以通过增加开发井,逐渐完善井网。综合分析研究区地质条件,建议部署5口开发井和3口探边开发评价井。更多还原

【Abstract】 With the enlarging gas productivity and increasing numbers of gas wells with underground water,more and more attention have been paid to the development countermeasure of gas reservoir with water.The main characteristics of JingBian gas field is of low pressure,low permeability,low abundance,strong heterogeneity and so on.Aiming at the actual problem during the development of Ma5₁₊₂gas reservoir in Nan2 Block of JingBian gas field,the distribution of the "relatively rich water area "and the gas reservoir engineering are studied in this article.The main points are as follows:（1）According to the dynamical production of producing wells,the geological analysis of Nan2 area and the gas reservoir engineering method,a useful way to identify the different types of formation water is brought forward.Based on the research above,this paper has analysed the mechanism of produced water and the rule of gas production.（2）On the basis of the reservoir property and the distribution of the water and gas in Ma5₁₊₂reservoir in ChangQing JingBian gas field,this article has made research on the distribution rules of the "relatively rich water area" and the influential factor of gas production.This paper gets some conclusions that the distribution rules of the relatively rich water zone is affected by regional structure,local structure, barrier for the change of the reservoir and so on.（Including the influence of the corroded fluting）（3）From the analysis of the single factor which impact the critical liquid carrying gas production rate,we can know that the critical liquid carrying flow rate will be reduced if the tubing inside diameter be shortened.For the water-yielding gas well which the carrying capacity is deficient,we can consider making use of the macaroni tubing string to extract gas by water drainage and process continuous production on condition that keeping the production rate is above the critical liquid carrying flow rate.Then the gas well can keep on utilizing self-energy to produce gas along with water continuously.（4）According to the characteristics of the gas reservoir in Nan2 block in JingBian gas field,a reservoir model of Ma5₁₊₂is established,and digital simulation is performed to match the production performances.At last,a rational forecasts of the development performance is proposed.The main technical development strategies are:①For the limited "relatively rich water area",which has lower water energy,we should keep the daily gas production greater than the required minimal gas production to drain water by the energy of itself.②For the larger "relatively rich water area",we should drain the water manually to decrease the pressure of internal water body.At the edge of the water zones,we should control the gas production rate to keep the equilibrium of the pressure difference between "relatively rich water area" and pure gas areas,for the purpose of keeping the water production lower and gas production higher.③The present well pattern is imperfect,and we should add more production wells to improve the well pattern.Combined with the geological conditions of the study area,5 new gas production wells and 3 additional prospect wells are proposed.更多还原