苏里格气井井筒积液规律及积液判据研究

发布时间：2018-07-27 17:37

【摘要】：目前,苏里格气田已进入大规模的生产开发阶段,气田产能快速攀升,己成为长庆气区年产规模最大的气田。随着气藏的开发,气田产水井逐渐增多,据统计,截止2014年底苏里格气田产水井占总井数的40%左右。同时,为使薄而多气层段的井得到有效开发,气田采用了油管机械封隔分压合采一体化完井管柱生产,且油管中大多装有节流器,导致常用的积液判识方法己不再适用,如何判断带节流器气井的井筒积液己成为困扰苏里格气田生产的重要问题。为节约成本,苏里格气田采用简化的地面流程,导致单井的产水量数据和实测井底压力数据存在一定的缺位,这也给井筒积液预测带来了更多的困难。本文建立的针对苏里格生产特征的积液预测模型能较好地解决上述难题,对整个气田乃至其它低渗气田产水井的研究都具有一定的指导和借鉴意义。本文在综合考虑气井的储量、配产比、采气速度等因素基础上,分别分析了气井不积液时套压的变化特征以及积液速率与套压斜率的量化特征,从而建立了利用套压曲线和产量变化特征预测环空积液高度的新方法。进一步获得了一种以套压计算得到的井底流压为约束、利用油压预测油管积液量的新方法,并最终形成了一套适用于苏里格气田的井筒积液预测模型。通过模型,结合理论计算和实测数据分析,给出了苏里格气井积液判识技术的评价方法,不仅可以判断井筒的积液情况还可以计算出井筒中具体的积液量,为预防井筒积液和后期排水采气工作提供了重要依据。
[Abstract]:At present, Sulige gas field has entered the stage of large-scale production and development, and the gas field productivity is rising rapidly, which has become the largest gas field in Changqing gas area. With the development of gas reservoir, gas field production wells are increasing gradually. According to statistics, Sulige gas production wells account for about 40% of the total wells by the end of 2014. At the same time, in order to make the well of thin and multi-gas reservoir effectively developed, the gas field adopts the tubing mechanical sealing, partitioning, pressure and production integrated well string production, and most of the tubing are equipped with throttle, so the commonly used method of accumulative liquid recognition is no longer applicable. How to judge the wellbore fluid accumulation with throttle has become an important problem in Sulige gas field production. In order to save the cost, Sulige gas field adopts a simplified surface flow, which leads to the absence of single well water production data and measured bottom hole pressure data, which also brings more difficulties to the prediction of wellbore fluid accumulation. The liquid accumulation prediction model established in this paper for Sulige production characteristics can solve the above problems well and has certain guiding and referential significance for the study of the whole gas field and other low-permeability gas production wells. On the basis of synthetically considering the reserves, production ratio and gas recovery rate of gas wells, the variation characteristics of casing pressure and the quantitative characteristics of fluid accumulation rate and casing pressure slope of gas wells without fluid accumulation are analyzed respectively in this paper. A new method for predicting the height of liquid accumulation in annulus is established by using the casing pressure curve and the characteristics of output variation. A new method of predicting tubing fluid accumulation by oil pressure is obtained, which is constrained by the bottom hole flow pressure calculated by casing pressure. Finally, a set of wellbore fluid accumulation prediction model suitable for Sulige gas field is formed. Through the model, combined with the theoretical calculation and the analysis of the measured data, the evaluation method of sullige gas well accumulation identification technology is given, which can not only judge the wellbore fluid accumulation but also calculate the specific fluid accumulation in the wellbore. It provides an important basis for the prevention of wellbore fluid accumulation and later drainage and gas production.
【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】：TE377

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