本文選題：低滲透 + 反凝析傷害　； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：YT氣田營城組儲層為一典型低孔致密火山巖凝析氣藏。開發(fā)過程中,出現(xiàn)了產(chǎn)量遞減快、井底積液、凝析油析出等問題,開采效果不理想。因此,有必要對YT氣藏的儲層傷害機(jī)理進(jìn)行深入研究,找準(zhǔn)治理對策,解除傷害,恢復(fù)氣井產(chǎn)能。 基于國內(nèi)外關(guān)于凝析氣藏傷害機(jī)理、評價方法及解堵技術(shù)的文獻(xiàn)調(diào)研,結(jié)合YT氣藏的儲層自身情況,以室內(nèi)實驗評價為主,理論分析為輔,對YT氣藏進(jìn)行傷害分析及治理技術(shù)研究。通過壓汞曲線、鑄體薄片、電鏡掃描、X-衍射、光譜、色譜等室內(nèi)實驗分析YT氣藏營城組儲層潛在傷害因素。特別針對YT儲層液相傷害展開重點研究,通過P-T相圖、定容衰竭、等組分膨脹、水鎖指數(shù)法、室內(nèi)水鎖傷害評價法等方法對該儲層存在的反凝析傷害、水鎖傷害進(jìn)行評價�；赮T儲層傷害的主控因素,建立室內(nèi)酸液、解液鎖劑解除傷害的實驗評價方法,優(yōu)選酸液體系,比選解液鎖劑,比選酸化工藝,優(yōu)化施工參數(shù),形成一套復(fù)合酸化解堵方案。 經(jīng)上述YT儲層傷害機(jī)理及解堵技術(shù)室內(nèi)實驗評價和理論分析,取得的主要認(rèn)識為： 除了儲層本身孔滲低、非均質(zhì)強(qiáng)、能量供給困難外,導(dǎo)致氣井低效的主要問題在于前期作業(yè)引入外來流體和侵入地層水體造成水鎖傷害、地層壓力溫度降低引發(fā)反凝析傷害以及壓裂液殘渣對水力裂縫的傷害。其中,水鎖傷害主要存在于近井筒地層及水力裂縫濾失帶,呈中等水鎖傷害；該儲層中部目前沒有發(fā)生反凝析傷害,傷害主要集中于近井筒地帶,呈中偏弱傷害；由于支撐裂縫閉合及壓裂液殘渣堵塞,對水力裂縫導(dǎo)流能力造成一定影響,總體上講,水鎖及反凝析傷害更嚴(yán)重。 在緩速酸的基礎(chǔ)上,加入解液鎖劑,解除固相堵塞、通縫擴(kuò)喉的同時,解除液相傷害、降低滲流阻力、加大液相蒸發(fā)。最終優(yōu)選的酸液體系為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,解液鎖劑體系為1%XN-BH-2+20%XN-YJ-1+79%甲醇。采用纖維暫堵注酸工藝,達(dá)到均勻布酸目的,同時進(jìn)行施工參數(shù)優(yōu)化,達(dá)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.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE358

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本文編號：1791044