本文選題：欠平衡鉆井 + 取心技術(shù)��； 參考：《東北石油大學(xué)》2015年碩士論文

【摘要】：遼河油區(qū)古潛山油氣藏為裂縫性油氣藏和衰竭油藏、漏失嚴重的油氣藏。油層壓力和產(chǎn)量較低,存在著較大勘探開發(fā)難度。古潛山和低壓低滲透深部油氣藏鉆遇裂縫發(fā)育較差壓力較低的地層時,因發(fā)生井漏致使油氣井產(chǎn)量極低,此時需要采用欠平衡鉆井技術(shù)來保護油氣層,降低裂縫發(fā)育較差壓力較低地層鉆井液漏失對儲層的傷害。為了獲取地下巖心資料,需要在欠平衡鉆井中進行取心。利用欠平衡取心技術(shù)獲得的巖心將更完整地保留巖層的原始孔隙度、滲透率、飽和度等,為分析地層的物理特性提供更準確的地質(zhì)資料[1-5]。欠平衡鉆井技術(shù)是在地層壓力大于井眼液柱壓力下的一種特殊鉆井技術(shù),要真正實現(xiàn)保護油氣藏的目的,欠平衡鉆井技術(shù)必須實現(xiàn)全過程欠平衡鉆井與完井投產(chǎn),作為配套技術(shù)的欠平衡鉆井取心技術(shù)也隨之應(yīng)運而生[6]。本文所指的欠平衡鉆井取心技術(shù)是指在以鉆井液(非氣體)作為循環(huán)介質(zhì)的欠平衡鉆井條件下的一項特殊取心技術(shù),利用該取心技術(shù)獲得的巖心將更完整地保留巖層的原始孔隙度、滲透率、飽和度等,為分析地層的物理特性提供更準確的地質(zhì)資料[7]。通過欠平衡取心技術(shù)不僅可以提高在欠平衡鉆井條件下的巖心收獲率和單筒進尺,有利于獲得真實的地質(zhì)資料,同時緩解了鉆井液對儲層的傷害。對遼河油田地區(qū)層低壓低滲透裂縫性油氣藏的勘探開發(fā)具有重要的實用價值。本文“欠平衡鉆井取心工具設(shè)計及現(xiàn)場應(yīng)用研究”項目完成了欠平衡鉆井取心技術(shù)的前期現(xiàn)狀調(diào)研,提出了實施欠平衡鉆井取心的難點,完成了欠平衡取心工具與鉆頭的研制,并對工具進行了受力分析與強度校核,開展了欠平衡鉆井取心工藝技術(shù)研究,編制了欠平衡取心操作規(guī)程和應(yīng)急預(yù)案。完成Φ215.9mm井眼液相欠平衡取心現(xiàn)場試驗7口井,取心8筒,進尺25.19m,心長22.38m,平均巖心收獲率88.84%;完成Φ152.4mm井眼液相欠平衡取心現(xiàn)場試驗4口井,取心6筒,進尺14.80m,進尺10.20m,平均巖心收獲率68.92%。氣體鉆井取心工具現(xiàn)場試驗1口井,取心3筒,進尺10.84m,心長6.25m,平均收獲率57.66%。
[Abstract]:The ancient Qianshan oil and gas reservoirs in the Liaohe oil area are fractured oil and gas reservoirs and depleted reservoirs. The oil and gas reservoirs have a serious leakage. The oil reservoir pressure and production are low, and there is a great difficulty in exploration and development. When the oil and gas reservoirs in the ancient Qianshan and the low pressure and low permeability deep oil and gas reservoirs have been drilled with low pressure, the production of oil and gas wells is very low because of the leakage of wells. The underbalanced drilling technology should be used to protect the reservoir and reduce the damage to the reservoir by the leakage of the lower formation pressure. In order to obtain the data of the underground core, it is necessary to take the core in underbalanced drilling. The core of the underbalanced core technology will retain the original porosity, permeability and saturation of the rock layer more completely. In order to provide more accurate geological data for the analysis of the physical characteristics of the formation, [1-5]. underbalanced drilling technology is a special drilling technology under the pressure of the formation pressure greater than the hole liquid column. To truly realize the purpose of protecting the oil and gas reservoirs, the underbalanced drilling technology must be carried out in full range underbalanced drilling and completion, as a supporting technique. The underbalanced drilling technology also emerges as the times require that the underbalanced drilling coring technology referred to in this paper is a special coring technique under under balanced drilling conditions with drilling fluid (non gas) as a circulating medium. The core obtained by the core technology will retain the original porosity and permeability of the rock layer more completely by using the core technology obtained by the core technology. In order to provide more accurate geological data for the analysis of the physical characteristics of the strata, [7]. can not only improve the core harvest rate and the single tube footage under the underbalanced drilling conditions, but also help to obtain the real geological data and alleviate the damage to the reservoir by the drilling fluid. The exploration and development of fractured oil and gas reservoirs has important practical value. In this paper, the research on the design and field application of the underbalanced drilling coring tool has completed the preliminary investigation of the core technology in underbalanced drilling, and put forward the difficulties in the implementation of underbalanced drilling coring, and completed the development of underbalanced core tools and bits. It has carried out the stress analysis and strength check, carried out the underbalanced drilling technology research, developed the underbalanced core operation regulations and emergency plan, completed the 7 wells with 7 wells, 8 barrels, the length of the core, the length 22.38m, the average core harvest rate of 88.84%, and the completion of the fluid phase in well 152.4mm. The balance coring field test 4 wells, coring 6 barrels, footage 14.80m, scale 10.20m, the average core harvest rate of 68.92%. gas drilling core tool field test 1 wells, core 3 barrels, 10.84m length 6.25m, the average harvest rate of 57.66%.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE92

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