YT凝析气藏营城组储层污染分析及治理技术研究
发布时间:2018-04-23 07:39
本文选题:低渗透 + 反凝析伤害 ; 参考:《西南石油大学》2015年硕士论文
【摘要】:YT气田营城组储层为一典型低孔致密火山岩凝析气藏。开发过程中,出现了产量递减快、井底积液、凝析油析出等问题,开采效果不理想。因此,有必要对YT气藏的储层伤害机理进行深入研究,找准治理对策,解除伤害,恢复气井产能。 基于国内外关于凝析气藏伤害机理、评价方法及解堵技术的文献调研,结合YT气藏的储层自身情况,以室内实验评价为主,理论分析为辅,对YT气藏进行伤害分析及治理技术研究。通过压汞曲线、铸体薄片、电镜扫描、X-衍射、光谱、色谱等室内实验分析YT气藏营城组储层潜在伤害因素。特别针对YT储层液相伤害展开重点研究,通过P-T相图、定容衰竭、等组分膨胀、水锁指数法、室内水锁伤害评价法等方法对该储层存在的反凝析伤害、水锁伤害进行评价。基于YT储层伤害的主控因素,建立室内酸液、解液锁剂解除伤害的实验评价方法,优选酸液体系,比选解液锁剂,比选酸化工艺,优化施工参数,形成一套复合酸化解堵方案。 经上述YT储层伤害机理及解堵技术室内实验评价和理论分析,取得的主要认识为: 除了储层本身孔渗低、非均质强、能量供给困难外,导致气井低效的主要问题在于前期作业引入外来流体和侵入地层水体造成水锁伤害、地层压力温度降低引发反凝析伤害以及压裂液残渣对水力裂缝的伤害。其中,水锁伤害主要存在于近井筒地层及水力裂缝滤失带,呈中等水锁伤害;该储层中部目前没有发生反凝析伤害,伤害主要集中于近井筒地带,呈中偏弱伤害;由于支撑裂缝闭合及压裂液残渣堵塞,对水力裂缝导流能力造成一定影响,总体上讲,水锁及反凝析伤害更严重。 在缓速酸的基础上,加入解液锁剂,解除固相堵塞、通缝扩喉的同时,解除液相伤害、降低渗流阻力、加大液相蒸发。最终优选的酸液体系为7%HCl+2%HF+5%YJS-1+2%XN-HS-1+1.5%XN-TW-4+1.5%XN-ZP-1+2.5%XN-NW-1,解液锁剂体系为1%XN-BH-2+20%XN-YJ-1+79%甲醇。采用纤维暂堵注酸工艺,达到均匀布酸目的,同时进行施工参数优化,达到最佳解堵效果。
[Abstract]:YT gas field Yingcheng formation reservoir is a typical low porosity dense volcanic condensate gas reservoir. In the process of development, there are some problems, such as rapid production decline, bottom hole liquid accumulation, condensate oil precipitation, etc. The recovery effect is not satisfactory. Therefore, it is necessary to study deeply the reservoir damage mechanism of YT gas reservoir, to find out the treatment countermeasures, to remove the damage and to restore the gas well productivity. Based on the domestic and international literature investigation on damage mechanism, evaluation method and plugging removal technology of condensate gas reservoir, combined with the reservoir situation of YT gas reservoir, laboratory experiment evaluation is the main method, and theoretical analysis is auxiliary. The damage analysis and treatment technology of YT gas reservoir were studied. The potential damage factors of YT gas reservoir in Yingcheng formation were analyzed by laboratory experiments such as mercury injection curve, casting sheet, scanning electron microscope (SEM) X-ray diffraction, spectrum, chromatography and so on. Especially focusing on the liquid phase damage of YT reservoir, the reverse condensate damage and water lock damage are evaluated by P-T phase diagram, constant volume exhaustion, expansion of other components, water lock index method and indoor water lock damage evaluation method. Based on the main control factors of YT reservoir damage, the experimental evaluation method of indoor acid solution and liquid locking agent is established, the optimum acid solution system is selected, the specific solution locking agent is selected, the acidification process is compared, the construction parameters are optimized, and a set of complex acid plugging solution scheme is formed. Through the laboratory experimental evaluation and theoretical analysis of the above YT reservoir damage mechanism and plugging removal technology, the main knowledge obtained is as follows: In addition to the low porosity and permeability of the reservoir itself, strong heterogeneity and difficulty in energy supply, the main problems leading to the low efficiency of gas wells are the introduction of foreign fluids and the invasion of formation water bodies in the early stage of operation, which results in water lock damage. The formation pressure and temperature decrease cause reverse condensate damage and fracturing fluid residue damage to hydraulic fracture. Among them, the water lock damage mainly exists in the near wellbore formation and the hydraulic fracture filtration zone, showing moderate water lock injury, and no reverse condensate injury occurs in the middle part of the reservoir at present, and the damage is mainly concentrated in the near wellbore zone, showing moderate and weak damage. Because of the closure of supporting fracture and the residue blockage of fracturing fluid, the hydraulic fracture conductivity is affected to some extent. Generally speaking, the damage of water lock and reverse condensate is more serious. On the basis of retarded acid, liquid locking agent is added to remove solid phase blockage and throat expansion. At the same time, liquid phase damage is relieved, seepage resistance is reduced, and liquid phase evaporation is increased. The optimized acid system is 7%HCl 2%HF 5%YJS-1 2%XN-HS-1 1.5%XN-TW-4 1.5%XN-ZP-1 2.5 XN-NW-1, and the liquid locking agent system is 1%XN-BH-2 20%XN-YJ-1 79% methanol. Fiber temporary plugging acid injection process is adopted to achieve the purpose of uniform acid distribution and optimization of construction parameters to achieve the best plugging removal effect.
【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】:TE358
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