苏北盆地戴南组和阜宁组地层取心关键技术
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摘要
针对苏北盆地戴南组和阜宁组泥岩地层取心钻进中存在的回次取心进尺少、岩心收获率低和取心机械钻速低等技术难点,在分析戴南组和阜宁组泥岩地层特点的基础上,研制了相应的PDC取心钻头,并优选了取心筒、优化了取心水力参数,形成了适用于苏北盆地泥岩地层的取心关键技术。PDC取心钻头以"G系列"齿为主切削齿,同时配合大喷嘴加内规径流道和优化的排屑槽斜面,既能降低岩屑与切削齿表面的摩擦力、改善岩屑运移状态和提高机械钻速,又具有效清洗切削齿、使岩心顺利进入内筒和提高岩心收获率的作用。该取心关键技术在48口井的戴南组和阜宁组地层进行了现场应用,岩心收获率平均大于98.0%,最高机械钻速达到24.80 m/h。苏北盆地泥岩地层取心关键技术解决了戴南组和阜宁组地层取心技术难点,具有较好的推广应用前景。
The goal of this study was to develop a coring bit that can overcome the challenges of challenging mudstone rocks. In the mudstone strata of the Dainan Formation and Funing Formation in the North Jiangsu Basin, there are problems such as less footage for each coring, low core recovery and lower coring ROP. After analyzing the geological characteristics and drillability of cored stratum, a PDC coring bit suitable for the Dainan and Funing mudstone strata was developed. This bit adopts the "G series" teeth as the main cutters, and it is fitted with the large nozzle and inner gauge flow channel and applies the optimally designed the slot slope for removing cuttings. It is able to reduce the friction between the cuttings and cutters,improve the cutting migration state and enhance the ROP. Furthermore, it can clean the cutters effectively, and facilitate the core entering the inner barrel, which improves the core recovery significantly. The new coring bit and optimal coring barrel were jointly used to core the Dainan Formation and Funing Formation in 48 exploration wells, with an average core recovery of greater than 98.0% and maximum ROP of 24.80 m/h. By aligning the new coring bit with technologies, researchers solved the coring problems of the Dainan Formation and Funing Formation in North Jiangsu Basin, with good on-site promotion and application value for best practices
The goal of this study was to develop a coring bit that can overcome the challenges of challenging mudstone rocks. In the mudstone strata of the Dainan Formation and Funing Formation in the North Jiangsu Basin, there are problems such as less footage for each coring, low core recovery and lower coring ROP. After analyzing the geological characteristics and drillability of cored stratum, a PDC coring bit suitable for the Dainan and Funing mudstone strata was developed. This bit adopts the "G series" teeth as the main cutters, and it is fitted with the large nozzle and inner gauge flow channel and applies the optimally designed the slot slope for removing cuttings. It is able to reduce the friction between the cuttings and cutters,improve the cutting migration state and enhance the ROP. Furthermore, it can clean the cutters effectively, and facilitate the core entering the inner barrel, which improves the core recovery significantly. The new coring bit and optimal coring barrel were jointly used to core the Dainan Formation and Funing Formation in 48 exploration wells, with an average core recovery of greater than 98.0% and maximum ROP of 24.80 m/h. By aligning the new coring bit with technologies, researchers solved the coring problems of the Dainan Formation and Funing Formation in North Jiangsu Basin, with good on-site promotion and application value for best practices
引文
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[7]曹华庆,高长斌.非常规龙马溪组和牛蹄塘组页岩取心技术[J].油气藏评价与开发,2018,8(2):80-84.CAO Huaqing,GAO Changbin.Shale coring technology in Longmaxi Formation and Niutitang Formation of unconventional shale gas field[J].Reservoir Evaluation and Development,2018,8(2):80-84.
[8]梁海明,裴学良,赵波.页岩地层取心技术研究及现场应用[J].石油钻探技术,2016,44(1):39-43.LIANG Haiming,PEI Xueliang,ZHAO Bo.Coring techniques in shale formations and their field application[J].Petroleum Drilling Techniques,2016,44(1):39-43.
[9]赵佩华,朱春启.PDC钻头的水力设计和轮廓是减少钻头泥包的关键[J].国外石油机械,1997,8(5):8-14.ZHAO Peihua,ZHU Chunqi.The hydraulic design and contouring of the PDC bit is the key to reducing bit mud packs[J].Foreign Petroleum Machinery,1997,8(5):8-14.
[10]王建宁,艾中华,刘畅,等.俄罗斯远东亚极地海域钻井取心技术[J].石油钻采工艺,2015,37(2):35-38.WANG Jianning,AI Zhonghua,LIU Chang,et al.Drilling and coring technologies for polar offshore areas of Russia Far East[J].Oil Drilling&Production Technology,2015,37(2):35-38.
[11]苏洋.伊拉克格拉芙油田Mishrif储层长筒取心技术[J].石油钻探技术,2017,45(5):30-35.SU Yang.Long-barrel coring technique for the Mishrif Reservoir in the Garraf Oilfield,Iraq[J].Petroleum Drilling Techniques,2017,45(5):30-35.
[12]蒋应政.多用取芯工具[J].石油钻探技术,1991,19(4):12-15.JIANG Yingzheng.Multi-purpose coring tool[J].Petroleum Drilling Techniques,1991,19(4):12-15.
[2]赵凯,樊勇杰,于波,等.硬脆性泥页岩井壁稳定研究进展[J].石油钻采工艺,2016,38(3):276-279.ZHAO Kai,FAN Yongjie,YU Bo,et al.Research progress of wellbore stability in hard brittle shale[J].Oil Drilling&Production Technology,2016,38(3):276-279.
[3]程海生,刘世丽,段宏亮.苏北盆地阜宁组泥页岩储层特征[J].复杂油气藏,2015,8(3):10-16.CHENG Haisheng,LIU Shili,DUAN Hongliang.Shale reservoir characteristics of Funing Formation in Subei Basin[J].Complex Hydrocarbon Reservoirs,2015,8(3):10-16.
[4]蔡环.PDC钻头关键设计参数优化研究[D].青岛:中国石油大学(华东),2008.CAI Huan.Research on optimization of key design parameters of PDC bits[D].Qingdao:China University of Petroleum(Huadong),2008.
[5]田家林,朱志,程文明,等.新型随钻取心钻头破岩提速工作机理[J].天然气工业,2018,38(6):97-104.TIAN Jialin,ZHU Zhi,CHENG Wenming,et al.Rock breaking and ROP improvement mechanisms of a new CWD drill bit[J].Natural Gas Industry,2018,38(6):97-104.
[6]况雨春,曾恒,周学军,等.PDC钻头水力结构优化设计研究[J].天然气工业,2006,26(4):60-62.KUANG Yuchun,ZENG Heng,ZHOU Xuejun,et al.Research on optimization design of PDC bit hydraulic structure[J].Natural Gas Industry,2006,26(4):60-62.
[7]曹华庆,高长斌.非常规龙马溪组和牛蹄塘组页岩取心技术[J].油气藏评价与开发,2018,8(2):80-84.CAO Huaqing,GAO Changbin.Shale coring technology in Longmaxi Formation and Niutitang Formation of unconventional shale gas field[J].Reservoir Evaluation and Development,2018,8(2):80-84.
[8]梁海明,裴学良,赵波.页岩地层取心技术研究及现场应用[J].石油钻探技术,2016,44(1):39-43.LIANG Haiming,PEI Xueliang,ZHAO Bo.Coring techniques in shale formations and their field application[J].Petroleum Drilling Techniques,2016,44(1):39-43.
[9]赵佩华,朱春启.PDC钻头的水力设计和轮廓是减少钻头泥包的关键[J].国外石油机械,1997,8(5):8-14.ZHAO Peihua,ZHU Chunqi.The hydraulic design and contouring of the PDC bit is the key to reducing bit mud packs[J].Foreign Petroleum Machinery,1997,8(5):8-14.
[10]王建宁,艾中华,刘畅,等.俄罗斯远东亚极地海域钻井取心技术[J].石油钻采工艺,2015,37(2):35-38.WANG Jianning,AI Zhonghua,LIU Chang,et al.Drilling and coring technologies for polar offshore areas of Russia Far East[J].Oil Drilling&Production Technology,2015,37(2):35-38.
[11]苏洋.伊拉克格拉芙油田Mishrif储层长筒取心技术[J].石油钻探技术,2017,45(5):30-35.SU Yang.Long-barrel coring technique for the Mishrif Reservoir in the Garraf Oilfield,Iraq[J].Petroleum Drilling Techniques,2017,45(5):30-35.
[12]蒋应政.多用取芯工具[J].石油钻探技术,1991,19(4):12-15.JIANG Yingzheng.Multi-purpose coring tool[J].Petroleum Drilling Techniques,1991,19(4):12-15.