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Petroleum 2019年第1期5卷 1-12页

作者： Dipal Patel Vivek Thakar Sivakumar Pandian Manan Shah Anirbid Sircar School of Petroleum Technology Pandit Deendayal Petroleum UniversityGandhinagar382007India

The extraction of petroleum fluids from sub-surface accumulations mandates the drilling of a well into the formation containing the *** drilling techniques have evolved over time to overcome several challenges while some of the issues still prevail with the currently used drilling practices like loss circulation,large tripping time to change bottom hole assembly,stuck pipe problems and low well bore stability,to name a *** decrease the drilling efficiency and increase the Non-Productive Time(NPT)of this highly capitalintensive industry encouraging the Petroleum Industry to look for new *** while Drilling(CwD)is a technique of drilling which has been proven to alleviate many of the problems faced while *** this method,drilling and casing of a well bore is carried out simultaneously,which improves the drilling efficiency by reducing the *** has proven to be beneficial in controlling loss circulation and improving wellbore stability by‘Plastering’effect,high quality cement job and increased rig floor *** uses smaller rig and less fuel thereby reducing carbon footprint in the *** paper studies comprehensive well control and casing string design *** encourages its application that has been discussed in the paper.A case study on the application of CwD in Malay basin for top hole drilling is ***,the paper briefly outlines the technical challenges that need attention to get better results from CwD.

关键词： Casing while drilling Non productive time Plastering effect well control

Integrated risk management: a Petrobras application in offshore well construction safety to minimize critical emergency disconnections

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Petroleum Science 2018年第2期15卷 421-431页

作者： Claudio Benevenuto de Campos Lima Pedro Esteves Aranha Jose Francisco Tebaldi de Castro Gilson Brito Alves Lima Augusto Borella Hougaz Felipe de Souza Terra Petrobras Department of Production Engineering Federal Fluminense University

In order to avoid mistakes and to save a great deal of time in analysis, an innovative methodology was developed that can analyze the well operations and rig characteristics involved to define the best emergency disconnect sequence （EDS） available. A solution was developed based on the characteristics of the rigs and blowout preventers （BOPs）, and six variables were considered that directly affect the choice of EDS. All possible combinations of 64 scenarios were analyzed, and the priority of choice of the EDS was defined empirically. This paper presents an approach to EDS risk management and examples of exposure time （time without riser safety margin and shear capability） for the same well, which can be lowered from 13% to 0.1%. The impact of this reduction is related to the ability of the BOP to cut some of the heavy casings, in addition to improved availability of EDS modes. This implementation opened up many possibilities for the performance of risk exposure analysis, enabling comparison of several BOP configurations of contracted rigs and selection of the best options. This innovative approach allowed a better management of the rig schedules, prioritizing safety aspects and making it possible to allocate the fleet in a systematic way.

关键词： well safety Safety barriers Emergency disconnect sequence (EDS) well control Kick well design

Analysis of Drilling Troubles in Kazhdumi Formation of Yadavaran Oilfield, Iran

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China Oil & Gas 2015年第2期22卷 21-25页

作者： Bo Min Xu Enxin Jin Ruihuan Peng Nian Zhongyuan Petroleum Exploration Bureau Sinopec Research Institute of Petroleum Engineering

Drilling crews of Sinopec have encountered a series of troubles when drilling a formation called kazhdumi of Yadavaran oilfield, Iran in the last few years. The formation is buried in the depth from 3300m to 3500m, mainly including limestone, muddy limestone and some bituminous shale. Many microfissures exist in the formation and the equivalent density of formation pore pressure ranged from 1.19g/cm3 to 1.59g/cm3. Asphalt or heavy oil kicks occurred in drilling three wells in one and a half years, which contaminated the drilling fluid and made well killing difficult due to the kicks and lost circulation in open hole. Gas and hydrogen sulfide （the concentration is up to 40000ppm） were present in the wells, and finally two wells were completely abandoned and one partially losL which frustrated the drilling engineering seriously. By analyzing the data of ＆e drilled wells, the paper summarized the causes of the troubles, and put forward suggestions and conclusions that can serve as reference and guideline for drilling well in ＆is area in the future.

关键词： lran Yadavaran Kazhdumi Formation drilling heavy oil hydrogen sulfide well control

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“硬关井”水击压力计算及其应用

石油钻探技术 1995年第3期23卷 1-3,60页

作者：李相方郑权方石油大学(北京)石油工程系新疆塔西南勘探公司

根据气侵后环空气液两相流分布特点及水击压力在气液两相流及单相流中传播特点，计算了“硬关井”情况下的水击压力变化情况。研究表明：对于气侵情况，硬关井引起的水击压力对井眼中下部影响很小，主要作用于井口装置；如果并口流速不... 详细信息

根据气侵后环空气液两相流分布特点及水击压力在气液两相流及单相流中传播特点，计算了“硬关井”情况下的水击压力变化情况。研究表明：对于气侵情况，硬关井引起的水击压力对井眼中下部影响很小，主要作用于井口装置；如果并口流速不太大，可以采用硬关并，以便减少地层流体进一步侵入。

关键词： hard shut-in water+pressure gas cutting well control