欠平衡取心工具设计及现场应用研究

发布时间：2018-05-28 14:24

  本文选题：欠平衡钻井 + 取心技术　； 参考：《东北石油大学》2015年硕士论文

【摘要】：辽河油区古潜山油气藏为裂缝性油气藏和衰竭油藏、漏失严重的油气藏。油层压力和产量较低,存在着较大勘探开发难度。古潜山和低压低渗透深部油气藏钻遇裂缝发育较差压力较低的地层时,因发生井漏致使油气井产量极低,此时需要采用欠平衡钻井技术来保护油气层,降低裂缝发育较差压力较低地层钻井液漏失对储层的伤害。为了获取地下岩心资料,需要在欠平衡钻井中进行取心。利用欠平衡取心技术获得的岩心将更完整地保留岩层的原始孔隙度、渗透率、饱和度等,为分析地层的物理特性提供更准确的地质资料[1-5]。欠平衡钻井技术是在地层压力大于井眼液柱压力下的一种特殊钻井技术,要真正实现保护油气藏的目的,欠平衡钻井技术必须实现全过程欠平衡钻井与完井投产,作为配套技术的欠平衡钻井取心技术也随之应运而生[6]。本文所指的欠平衡钻井取心技术是指在以钻井液(非气体)作为循环介质的欠平衡钻井条件下的一项特殊取心技术,利用该取心技术获得的岩心将更完整地保留岩层的原始孔隙度、渗透率、饱和度等,为分析地层的物理特性提供更准确的地质资料[7]。通过欠平衡取心技术不仅可以提高在欠平衡钻井条件下的岩心收获率和单筒进尺,有利于获得真实的地质资料,同时缓解了钻井液对储层的伤害。对辽河油田地区层低压低渗透裂缝性油气藏的勘探开发具有重要的实用价值。本文“欠平衡钻井取心工具设计及现场应用研究”项目完成了欠平衡钻井取心技术的前期现状调研,提出了实施欠平衡钻井取心的难点,完成了欠平衡取心工具与钻头的研制,并对工具进行了受力分析与强度校核,开展了欠平衡钻井取心工艺技术研究,编制了欠平衡取心操作规程和应急预案。完成Φ215.9mm井眼液相欠平衡取心现场试验7口井,取心8筒,进尺25.19m,心长22.38m,平均岩心收获率88.84%;完成Φ152.4mm井眼液相欠平衡取心现场试验4口井,取心6筒,进尺14.80m,进尺10.20m,平均岩心收获率68.92%。气体钻井取心工具现场试验1口井,取心3筒,进尺10.84m,心长6.25m,平均收获率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%.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE92

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