S. Benmamar, S. Al Arfi, S. Perumalla, G. Salem, A. Baruno, S. Saha, Pranjal Bhatt
{"title":"地质力学指导下的明智决策提高钻井性能——以阿布扎比陆上油田为例阿联酋","authors":"S. Benmamar, S. Al Arfi, S. Perumalla, G. Salem, A. Baruno, S. Saha, Pranjal Bhatt","doi":"10.2118/204559-ms","DOIUrl":null,"url":null,"abstract":"\n ADNOC (Abu Dhabi National Oil Company) recently drilled some wells in Onshore Abu Dhabi (Field-A) and encountered consistent hole instability from Umm Er Radhuma (UER) to Simsima. Thus, a GeoMechanical review was proposed to investigate the root causes, if any, and recommend possible remedies for the upcoming drilling campaign.\n While detailed drilling event analysis allowed to investigate the correlation between the mud weight program and well trajectory, borehole image log analysis and geological understanding from nearby fields indicated the possible role of structural and lithological features on hole instability. Integration of drilling engineering data and regional geological knowledge helped to narrow down the possible causes of drilling challenges. Sedimentalogical review of Image logs have established some correlation between rock types and hole instability events.\n Drilling experience shows there is very narrow margin for loss and/or gain to occur. There is regional geological evidence of the presence of a wide range of vuggy structures, as well as natural fractures and/or faults. These features tend to make Simsima formation heterogeneous in terms of permeability and more prone to losses. Since most fractures are parallel to SHmax direction and well was drilled towards Shmin direction, there are greater chances of encountering faults and/or fractures, which would be critically-stressed and lead to loss and/or gain situations. Geomechanical parameters helped highlight the magnitudes and orientations of principal stresses. Observations of several tight hole and stuck pipe events while tripping from Radhuma and UERB shale to Simsima seem to indicate mud weight used was insufficient. Role of multiple failure mechanisms was identified, and relevant solutions were recommended as well as implemented to achieve the drilling success.\n The case study presented here emphasizes how different carbonate textures and the presence and orientation of natural fractures and/or faults within Simsima formation can impact hole instability with respect to wellbore trajectory. Proactive implementation of recommendations from this analysis on well planning and fluid design resulted in improvement of drilling performance and reduction of non-productive time in new wells.","PeriodicalId":11094,"journal":{"name":"Day 2 Mon, November 29, 2021","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Informed Decisions Guided by GeoMechanics to Improve Drilling Performance: A Case Study from Onshore Field, Abu Dhabi; UAE\",\"authors\":\"S. Benmamar, S. Al Arfi, S. Perumalla, G. Salem, A. Baruno, S. Saha, Pranjal Bhatt\",\"doi\":\"10.2118/204559-ms\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n ADNOC (Abu Dhabi National Oil Company) recently drilled some wells in Onshore Abu Dhabi (Field-A) and encountered consistent hole instability from Umm Er Radhuma (UER) to Simsima. Thus, a GeoMechanical review was proposed to investigate the root causes, if any, and recommend possible remedies for the upcoming drilling campaign.\\n While detailed drilling event analysis allowed to investigate the correlation between the mud weight program and well trajectory, borehole image log analysis and geological understanding from nearby fields indicated the possible role of structural and lithological features on hole instability. Integration of drilling engineering data and regional geological knowledge helped to narrow down the possible causes of drilling challenges. Sedimentalogical review of Image logs have established some correlation between rock types and hole instability events.\\n Drilling experience shows there is very narrow margin for loss and/or gain to occur. There is regional geological evidence of the presence of a wide range of vuggy structures, as well as natural fractures and/or faults. These features tend to make Simsima formation heterogeneous in terms of permeability and more prone to losses. Since most fractures are parallel to SHmax direction and well was drilled towards Shmin direction, there are greater chances of encountering faults and/or fractures, which would be critically-stressed and lead to loss and/or gain situations. Geomechanical parameters helped highlight the magnitudes and orientations of principal stresses. Observations of several tight hole and stuck pipe events while tripping from Radhuma and UERB shale to Simsima seem to indicate mud weight used was insufficient. Role of multiple failure mechanisms was identified, and relevant solutions were recommended as well as implemented to achieve the drilling success.\\n The case study presented here emphasizes how different carbonate textures and the presence and orientation of natural fractures and/or faults within Simsima formation can impact hole instability with respect to wellbore trajectory. 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引用次数: 0
摘要
ADNOC(阿布扎比国家石油公司)最近在阿布扎比陆上(a油田)钻了几口井,从Umm Er Radhuma (UER)到Simsima都遇到了持续的井眼不稳定问题。因此,建议进行地质力学评估,以调查根本原因(如果有的话),并为即将到来的钻井活动提出可能的补救措施。虽然详细的钻井事件分析可以研究泥浆比重计划与井眼轨迹之间的相关性,但井眼图像测井分析和附近油田的地质信息表明,构造和岩性特征可能对井眼不稳定起作用。钻井工程数据和区域地质知识的整合有助于缩小钻井挑战的可能原因。通过对成像测井资料的沉积学复习,建立了岩石类型与孔失稳事件之间的相关性。钻井经验表明,发生损失和/或收益的余地非常小。有区域地质证据表明存在广泛的洞状构造,以及天然裂缝和/或断层。这些特征使得Simsima地层渗透率不均匀,更容易发生漏失。由于大多数裂缝平行于SHmax方向,并且井是朝Shmin方向钻的,因此遇到断层和/或裂缝的可能性更大,这将导致临界应力,并导致损失和/或增加的情况。地质力学参数有助于突出主应力的大小和方向。在从Radhuma和UERB页岩到Simsima的起下钻过程中,观察到几次井眼紧井和卡管事件,似乎表明所使用的泥浆比重不足。确定了多种失效机制的作用,并提出了相应的解决方案,以实现钻井成功。本文的案例研究强调了Simsima地层中不同的碳酸盐结构、天然裂缝和/或断层的存在和方向如何影响井眼轨迹的不稳定性。根据分析得出的建议,积极实施井规划和流体设计,提高了钻井性能,减少了新井的非生产时间。
Informed Decisions Guided by GeoMechanics to Improve Drilling Performance: A Case Study from Onshore Field, Abu Dhabi; UAE
ADNOC (Abu Dhabi National Oil Company) recently drilled some wells in Onshore Abu Dhabi (Field-A) and encountered consistent hole instability from Umm Er Radhuma (UER) to Simsima. Thus, a GeoMechanical review was proposed to investigate the root causes, if any, and recommend possible remedies for the upcoming drilling campaign.
While detailed drilling event analysis allowed to investigate the correlation between the mud weight program and well trajectory, borehole image log analysis and geological understanding from nearby fields indicated the possible role of structural and lithological features on hole instability. Integration of drilling engineering data and regional geological knowledge helped to narrow down the possible causes of drilling challenges. Sedimentalogical review of Image logs have established some correlation between rock types and hole instability events.
Drilling experience shows there is very narrow margin for loss and/or gain to occur. There is regional geological evidence of the presence of a wide range of vuggy structures, as well as natural fractures and/or faults. These features tend to make Simsima formation heterogeneous in terms of permeability and more prone to losses. Since most fractures are parallel to SHmax direction and well was drilled towards Shmin direction, there are greater chances of encountering faults and/or fractures, which would be critically-stressed and lead to loss and/or gain situations. Geomechanical parameters helped highlight the magnitudes and orientations of principal stresses. Observations of several tight hole and stuck pipe events while tripping from Radhuma and UERB shale to Simsima seem to indicate mud weight used was insufficient. Role of multiple failure mechanisms was identified, and relevant solutions were recommended as well as implemented to achieve the drilling success.
The case study presented here emphasizes how different carbonate textures and the presence and orientation of natural fractures and/or faults within Simsima formation can impact hole instability with respect to wellbore trajectory. Proactive implementation of recommendations from this analysis on well planning and fluid design resulted in improvement of drilling performance and reduction of non-productive time in new wells.