保護儲層的油基鉆井液研究
發(fā)布時間：2019-06-26 18:33
【摘要】：通常認為油基鉆井液比水基鉆井液具有抗高溫、抗鹽/鈣侵、有利于井壁穩(wěn)定、潤滑性好和對油氣層損害程度小等多種優(yōu)點。目前已成為高溫深井、大斜度定向井、水平井和強水敏地層等各種復(fù)雜地層鉆進的重要手段。但油基鉆井液同樣存在一些缺點。例如,油基鉆井液懸浮穩(wěn)定性差,地層損害機理認識不足,儲層保護性能評價手段欠缺等問題,這些問題尚有待解決。 本文以塔里木油田大北區(qū)塊儲層為研究對象,以研究保護儲層的油基鉆井液技術(shù)為目標,在明確低孔特低滲裂縫性儲層地質(zhì)特征和損害機理的基礎(chǔ)上,開展現(xiàn)用油基鉆井液綜合性能評價,通過優(yōu)選性能優(yōu)良的處理劑,并結(jié)合儲層保護性能研究,形成保護儲層的油基鉆井液體系。 大北區(qū)塊儲層為低孔特低滲儲層,裂縫、微裂縫發(fā)育,黏土礦物含量較高。室內(nèi)研究表明,大北區(qū)塊儲層水敏、鹽敏及堿敏程度強；鹽酸酸敏程度中等偏強,基塊巖樣應(yīng)力敏感程度弱,裂縫巖樣應(yīng)力敏感程度強。實驗研究表明現(xiàn)用油基鉆井液體系穩(wěn)定性、儲層保護性能表現(xiàn)較差,對儲層造成一定程度的傷害,滲透率損害率均值可達30%,尚有改善空間。 通過對處理劑種類的篩選及加量的優(yōu)選,最終確定選用有機土AJ、主乳化劑EMUL-2、輔助乳化劑TLMFR、降濾失劑Duratone+Geltone和潤濕劑TLMRSJ等處理劑,結(jié)合優(yōu)選出的各處理劑配伍性能評價,在大量實驗基礎(chǔ)上最終確定油基鉆井液體系配方為：柴油+3%有機土AJ+3%主乳化劑EMUL-2+1%輔助乳化劑TLMFR+(濃度20%)CaCl2鹽水(油水比80：20)+2.5%CaO+2%降濾失劑Duratone+2%降濾失劑Geltone+1.5%潤濕劑TLMRSJ+重晶石(ρ=1.80g/cm3)。 針對大北區(qū)塊儲層特征及現(xiàn)用油基鉆井液綜合性能特點,結(jié)合保護油氣層技術(shù)手段,確定了保護大北區(qū)塊裂縫性儲層的油基鉆井液體系基本配方：自配油基鉆井液(ρ=1.80g/cm3)+0.2%纖維狀暫堵劑HF+2%復(fù)配活性CaCO3+0.5%酸溶性微錳礦(KGD)+0.5%可變形粒子(FEP)+其它。結(jié)合動態(tài)損害評價實驗,設(shè)計的保護儲層油基鉆井液體系可以滿足同時保護孔喉和裂縫的要求,暫堵后滲透率返排恢復(fù)率可達90%以上,達到了保護儲層的目的。
[Abstract]:It is generally considered that the oil-based drilling fluid has the advantages of resisting high temperature, resisting salt/ calcium, and being beneficial to the stability of the well wall, good lubricating property and small damage to the oil and gas layer. At present, it has become an important means of drilling in various complex formations such as high-temperature deep well, high-grade directional well, horizontal well and strong water-sensitive stratum. Oil-based drilling fluids also have some disadvantages. For example, the problems of poor suspension stability of oil-based drilling fluid, insufficient understanding of formation damage mechanism, lack of evaluation methods of reservoir protection performance, etc., are still to be solved. Based on the study of the geological characteristics and the damage mechanism of the low-porosity and low-permeability fractured reservoir, the comprehensive performance evaluation of the oil-based drilling fluid is carried out on the basis of defining the geological characteristics and the damage mechanism of the low-porosity and low-permeability fractured reservoir. The oil-based drilling fluid that protects the reservoir is formed by a treatment agent that is preferably excellent in performance, and in combination with the reservoir protection performance. The reservoir of the northern block is the low-porosity, low-permeability reservoir, the fracture, the micro-crack development, the clay mineral contains The results show that the water-sensitive, salt-sensitive and alkali-sensitive degree of the reservoir in the large north block are strong, the degree of acid sensitivity of the hydrochloric acid is moderate, the stress sensitivity of the base block is weak, and the crack rock-like stress is sensitive. The results of the experiment show that the stability of the oil-based drilling fluid system, the poor performance of the reservoir protection performance, the degree of damage to the reservoir, the average value of the permeability damage rate can reach 30%, The preparation method comprises the following steps of: selecting an organic soil AJ, a main emulsifier EMUL-2, an auxiliary emulsifier TLMFR, a filtrate reducer Duratone + Geltone and a wetting agent TLMSRJ, and the like, Wood-based drilling fluid system formula: diesel + 3% organic soil AJ + 3% main emulsifier EMUL-2 + 1% auxiliary emulsifier TLMFR + (concentration 20%) CaCl2salt water (oil-water ratio 80:20) + 2.5% CaO + 2% filtrate reducer Duratone + 2% filtrate reducer Geltone + 1.5% wetting agent TLMSRJ + barite (1 = 1.80 g / cm3). In view of the reservoir characteristics of the large north block and the characteristics of the comprehensive performance of the oil-based drilling fluid, the oil-based drilling of the fractured reservoir in the large north area is determined in combination with the technical means of protecting the oil and gas layer. Basic formula of liquid system: self-aligned oil-based drilling fluid (1 = 1.80 g/ cm3) + 0.2% fibrous temporary plugging agent HF + 2% compound active CaCO3 + 0.5% acid-soluble micromanganese ore (KGD) + 0.5% deformable particles ( In combination with the dynamic damage evaluation experiment, the designed oil-based drilling fluid system can meet the requirements of simultaneously protecting the pore throat and the crack, the recovery rate of the permeability after the temporary plugging can reach more than 90%,
【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】：TE254
本文編號：2506389
[Abstract]:It is generally considered that the oil-based drilling fluid has the advantages of resisting high temperature, resisting salt/ calcium, and being beneficial to the stability of the well wall, good lubricating property and small damage to the oil and gas layer. At present, it has become an important means of drilling in various complex formations such as high-temperature deep well, high-grade directional well, horizontal well and strong water-sensitive stratum. Oil-based drilling fluids also have some disadvantages. For example, the problems of poor suspension stability of oil-based drilling fluid, insufficient understanding of formation damage mechanism, lack of evaluation methods of reservoir protection performance, etc., are still to be solved. Based on the study of the geological characteristics and the damage mechanism of the low-porosity and low-permeability fractured reservoir, the comprehensive performance evaluation of the oil-based drilling fluid is carried out on the basis of defining the geological characteristics and the damage mechanism of the low-porosity and low-permeability fractured reservoir. The oil-based drilling fluid that protects the reservoir is formed by a treatment agent that is preferably excellent in performance, and in combination with the reservoir protection performance. The reservoir of the northern block is the low-porosity, low-permeability reservoir, the fracture, the micro-crack development, the clay mineral contains The results show that the water-sensitive, salt-sensitive and alkali-sensitive degree of the reservoir in the large north block are strong, the degree of acid sensitivity of the hydrochloric acid is moderate, the stress sensitivity of the base block is weak, and the crack rock-like stress is sensitive. The results of the experiment show that the stability of the oil-based drilling fluid system, the poor performance of the reservoir protection performance, the degree of damage to the reservoir, the average value of the permeability damage rate can reach 30%, The preparation method comprises the following steps of: selecting an organic soil AJ, a main emulsifier EMUL-2, an auxiliary emulsifier TLMFR, a filtrate reducer Duratone + Geltone and a wetting agent TLMSRJ, and the like, Wood-based drilling fluid system formula: diesel + 3% organic soil AJ + 3% main emulsifier EMUL-2 + 1% auxiliary emulsifier TLMFR + (concentration 20%) CaCl2salt water (oil-water ratio 80:20) + 2.5% CaO + 2% filtrate reducer Duratone + 2% filtrate reducer Geltone + 1.5% wetting agent TLMSRJ + barite (1 = 1.80 g / cm3). In view of the reservoir characteristics of the large north block and the characteristics of the comprehensive performance of the oil-based drilling fluid, the oil-based drilling of the fractured reservoir in the large north area is determined in combination with the technical means of protecting the oil and gas layer. Basic formula of liquid system: self-aligned oil-based drilling fluid (1 = 1.80 g/ cm3) + 0.2% fibrous temporary plugging agent HF + 2% compound active CaCO3 + 0.5% acid-soluble micromanganese ore (KGD) + 0.5% deformable particles ( In combination with the dynamic damage evaluation experiment, the designed oil-based drilling fluid system can meet the requirements of simultaneously protecting the pore throat and the crack, the recovery rate of the permeability after the temporary plugging can reach more than 90%,
【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】：TE254
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