K7凝析气藏开发潜力分析及开发调整方案研究

发布时间：2018-04-19 01:15

本文选题：带油环凝析气藏 + 潜力分析　；参考：《西南石油大学》2015年硕士论文

【摘要】：K7气藏为边水带油环凝析气藏,1977年井喷发现后,于1980年9月正式投产,目前处于产量递减阶段。该气藏由于早期井喷,导致地层压力下降,天然能量不足,开采初期地层中就有凝析油析出,后续衰竭式开采过程中凝析污染严重,凝析油采出程度低。同时由于气顶压力下降,部分边部气井出现油环突破现象。为了更加清楚地认识该气藏剩余储量分布情况,本文从生产动态资料和测试资料入手,分析单井剩余潜力及潜力层位,提出增产措施并进行可行性及机理分析研究；结合气藏地质特征,建立储层地质模型,利用数值模拟研究剩余储量分布,提出气藏开发调整方案,指导气藏合理开发。本次研究主要取得如下认识： (1)K7气藏储层基质物性较好,断层发育但隔挡作用差,水体不活跃。利用气藏地质资料建立了精细地质模型。 (2)对该气藏躺井、气井、边部油井进行了生产动态分析,根据油气井的生产历史数据计算了主要生产井天然气、凝析油的单井动态储量以及油井的油环、溶解气的单井动态储量。同时将单井采出油气劈分到各小层,得到各小层剩余潜力,并根据试油结果,对有潜力的井提出生产调整措施。 (3)气层单井动态地质储量分布不均匀,气顶气的主要潜力在K7-2、K7-3和K7-7小层。油环上的井少,单井油环油动态地质储量采出程度不均匀,平均油环油动态储量的采出程度25%,油环潜力较大。因此应该保持能量尽量多的开采油环,以提高油环采出程度。 (4)根据生产动态分析结果,提出循环注气提高凝析油采收率方法,并做机理研究,优选注采参数,针对本气藏这种中后期循环注气的气藏提出先高注采比后注气保压的循环注气方式,在相同注入气量情况下,此方法能获得更好的经济效益。 (5)数值模拟研究表明,剩余气主要分布在构造高部和构造西部,剩余油主要分布在构造南部,这些地方应作为挖潜的主要区域。 (6)根据动态分析单井潜力层位及数值模拟剩余油气分布,综合提出了单井生产制度调整、循环注气及打新井的开发调整方案,通过经济评价优选出了一套最优方案。
[Abstract]:K7 gas reservoir is a side water belt oil ring condensate gas reservoir. After the blowout was discovered in 1977, it was put into production in September 1980, and it is in the stage of production decline at present.Due to the early blowout, the formation pressure is decreased and the natural energy is insufficient. Condensate oil is precipitated in the early stage of exploitation, and the condensate pollution is serious and the recovery degree of condensate oil is low.At the same time, due to the decrease of gas cap pressure, oil ring breakthrough appears in some side gas wells.In order to understand the distribution of the remaining reserves of the gas reservoir more clearly, this paper starts with the production performance data and test data, analyzes the residual potential and potential horizon of single well, puts forward the measures of increasing production, and analyzes the feasibility and mechanism.Combined with the geological characteristics of the gas reservoir, the geological model of the reservoir is established, the distribution of remaining reserves is studied by numerical simulation, and the plan of gas reservoir development adjustment is put forward to guide the rational development of the gas reservoir.The main findings of this study are as follows:The reservoir matrix physical property of the gas reservoir is good, fault is developed, but the barrier is poor, and the water is not active.A fine geological model is established based on gas reservoir geological data.(2) the production performance of lying well, gas well and side oil well in this gas reservoir is analyzed. According to the production history data of oil and gas well, the dynamic reserves of natural gas, single well of condensate oil and the oil ring of oil well are calculated.Single well dynamic reserves of dissolved gas.At the same time, the oil and gas produced from single well are divided into each sublayer, and the residual potential of each sublayer is obtained. According to the result of oil test, the production adjustment measures for the potential well are put forward.The main potential of gas cap gas is in K7-2K7-3 and K7-7 sublayers.There are few wells on the oil ring, the recovery degree of the oil ring dynamic reserves is uneven, the recovery degree of the average oil ring dynamic reserves is 25, and the oil ring potential is great.Therefore, the energy should be kept as much as possible to improve the recovery of oil rings.4) according to the results of dynamic analysis of production, the method of improving condensate recovery by circulating gas injection is put forward, and the mechanism is studied to optimize the injection and production parameters.Aiming at this gas reservoir, a new way of gas injection with high injection / production ratio and then gas injection to maintain pressure is put forward. Under the condition of the same gas injection rate, this method can obtain better economic benefits.The numerical simulation results show that the residual gas is mainly distributed in the high part of the structure and the western part of the structure, and the remaining oil is mainly distributed in the southern part of the structure, which should be regarded as the main area of tapping potential.Based on the dynamic analysis of single well potential horizon and numerical simulation of remaining oil and gas distribution, the development adjustment scheme of single well production regulation, circulating gas injection and drilling new well is put forward, and a set of optimal scheme is selected through economic evaluation.
【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】：TE372

【参考文献】