水平井多级压裂井结垢问题:采用新型导流和阻垢技术的替代干预方法

M. Giammancheri, G. Tassone, G. Carpineta, A. Okoka, R. Itoua, R. Ilyasov, B. Reilly, Venkata Bhamidipati
{"title":"水平井多级压裂井结垢问题:采用新型导流和阻垢技术的替代干预方法","authors":"M. Giammancheri, G. Tassone, G. Carpineta, A. Okoka, R. Itoua, R. Ilyasov, B. Reilly, Venkata Bhamidipati","doi":"10.2118/212771-ms","DOIUrl":null,"url":null,"abstract":"\n In this paper we present case studies describing the approach adopted to solve scaling issues in a complex well architecture, an analysis of the scaling root causes, and the construction of a novel execution plan incorporating scale inhibitors, diverting agents with different acid systems to maximize the treatment efficiency.\n Even when producing at a low water cut fraction, most of the offshore multi-fractured wells in the field experienced scale deposition phenomena because of instability of the calcium ions present in the formation water. When pressure drawdown is applied on the producing wells, a progressive and severe worsening of production performance was observed, and in certain cases this led to a complete obstruction of the well.\n Previous stimulations executed on the under-performing wells were able to temporarily restore the production. Those treatments were performed using a conventional HCl acid system with coil tubing and these yielded positive results initially, but performance progressively decreased after a few months.\n For this reason, it was a priority to analyze the root cause of the deposition and define an improved method to extend the effectiveness of the intervention. Scale tendency analysis of the formation water highlighted the instability and predicted calcium carbonate presence at the reservoirs’ pressure and temperature range. Based on the evaluation of Saturation Index it was determined that calcite build-up can occur at any point in the production system. This was confirmed by field evidence, with scale deposit samples recovered at the choke, surface line and along the completion tubing.\n A nitrified organic acid blend was applied to invade deeply into the fracture body, together with a liquid scale inhibitor squeeze treatment that was designed to prevent further re-depositions in the short-term. A diversion technology was implemented to treat the multi-fractured horizontal wells in efficient manner by rig-less bullheading.\n Furthermore, due to unavailability of a rig in place, efforts were made to solve the different challenges to operate in rig-less mode: a lack of space on the production platform deck prevented any pumping intervention, and the well restart and clean up was executed directly in a high-pressure sea line.\n This alternative approach, with novel technologies for diversion and scale inhibition, yielded excellent well responses to the placement of the acid mixtures, which were designed to dissolve the carbonate scales with minimum impact on the sandstone formation, completion equipment, and production facilities. The selected solid diverting agent self-degraded by hydrolysis once in contact with water base fluids in the high temperature environment. This diverter was able to effectively distribute the acid treatment into each of the fractures: the particle size distribution was designed to efficiently bridge on the proppant pack in the fractures.\n The well start-up production rates confirmed the major benefits resulting from this approach: a higher Productivity Index was estimated on all the applications when compared to past conventional stimulations. Moreover, the use of a scale inhibitor extended the post-stimulation well life from few weeks, up to several months or years and therefore reduced the frequency of future well interventions. This novel alternative approach resulted in a more cost-effective well intervention solution and addressed the challenges of an intense offshore rig-less stimulation campaign in the field.","PeriodicalId":437231,"journal":{"name":"Day 1 Wed, March 15, 2023","volume":"73 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2023-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Scaling Issues on Horizontal Multi-Fractured Wells: An Alternative Intervention Approach with Novel Technologies for Diversion and Scale Inhibition\",\"authors\":\"M. Giammancheri, G. Tassone, G. Carpineta, A. Okoka, R. Itoua, R. Ilyasov, B. Reilly, Venkata Bhamidipati\",\"doi\":\"10.2118/212771-ms\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n In this paper we present case studies describing the approach adopted to solve scaling issues in a complex well architecture, an analysis of the scaling root causes, and the construction of a novel execution plan incorporating scale inhibitors, diverting agents with different acid systems to maximize the treatment efficiency.\\n Even when producing at a low water cut fraction, most of the offshore multi-fractured wells in the field experienced scale deposition phenomena because of instability of the calcium ions present in the formation water. When pressure drawdown is applied on the producing wells, a progressive and severe worsening of production performance was observed, and in certain cases this led to a complete obstruction of the well.\\n Previous stimulations executed on the under-performing wells were able to temporarily restore the production. Those treatments were performed using a conventional HCl acid system with coil tubing and these yielded positive results initially, but performance progressively decreased after a few months.\\n For this reason, it was a priority to analyze the root cause of the deposition and define an improved method to extend the effectiveness of the intervention. Scale tendency analysis of the formation water highlighted the instability and predicted calcium carbonate presence at the reservoirs’ pressure and temperature range. Based on the evaluation of Saturation Index it was determined that calcite build-up can occur at any point in the production system. This was confirmed by field evidence, with scale deposit samples recovered at the choke, surface line and along the completion tubing.\\n A nitrified organic acid blend was applied to invade deeply into the fracture body, together with a liquid scale inhibitor squeeze treatment that was designed to prevent further re-depositions in the short-term. A diversion technology was implemented to treat the multi-fractured horizontal wells in efficient manner by rig-less bullheading.\\n Furthermore, due to unavailability of a rig in place, efforts were made to solve the different challenges to operate in rig-less mode: a lack of space on the production platform deck prevented any pumping intervention, and the well restart and clean up was executed directly in a high-pressure sea line.\\n This alternative approach, with novel technologies for diversion and scale inhibition, yielded excellent well responses to the placement of the acid mixtures, which were designed to dissolve the carbonate scales with minimum impact on the sandstone formation, completion equipment, and production facilities. The selected solid diverting agent self-degraded by hydrolysis once in contact with water base fluids in the high temperature environment. This diverter was able to effectively distribute the acid treatment into each of the fractures: the particle size distribution was designed to efficiently bridge on the proppant pack in the fractures.\\n The well start-up production rates confirmed the major benefits resulting from this approach: a higher Productivity Index was estimated on all the applications when compared to past conventional stimulations. Moreover, the use of a scale inhibitor extended the post-stimulation well life from few weeks, up to several months or years and therefore reduced the frequency of future well interventions. This novel alternative approach resulted in a more cost-effective well intervention solution and addressed the challenges of an intense offshore rig-less stimulation campaign in the field.\",\"PeriodicalId\":437231,\"journal\":{\"name\":\"Day 1 Wed, March 15, 2023\",\"volume\":\"73 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2023-03-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Day 1 Wed, March 15, 2023\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.2118/212771-ms\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Day 1 Wed, March 15, 2023","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2118/212771-ms","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

摘要

在本文中,我们介绍了解决复杂井结构中结垢问题的方法,分析了结垢的根本原因,并构建了一种新的执行计划,该计划结合了阻垢剂、不同酸体系的转向剂,以最大限度地提高处理效率。由于地层水中钙离子的不稳定性,即使在含水较低的情况下进行生产,大多数海上多缝井也会出现水垢沉积现象。当对生产井施加压降时,观察到生产性能逐渐严重恶化,在某些情况下会导致井完全堵塞。之前对表现不佳的井进行的增产措施能够暂时恢复生产。这些处理使用常规的HCl酸体系和盘管进行,最初取得了良好的效果,但几个月后性能逐渐下降。因此,当务之急是分析沉积的根本原因,并确定一种改进的方法来延长修井的有效性。地层水结垢趋势分析突出了地层水的不稳定性,并预测了储层压力和温度范围内碳酸钙的存在。根据饱和指数的评估,方解石积聚可能发生在生产系统的任何一点。现场证据证实了这一点,在节流阀、地面管线和完井油管沿线回收了结垢沉积物样本。将一种硝化有机酸混合物应用于裂缝体深处,并结合液体阻垢剂挤压处理,以防止短期内进一步重新沉积。采用无钻机顶井技术,对多裂缝水平井进行了高效的分流处理。此外,由于没有合适的钻机,作业人员努力解决了在无钻机模式下作业的不同挑战:生产平台甲板空间不足,无法进行泵送干预,井的重启和清理工作直接在高压海上管线中进行。这种替代方法采用了新型的转移和阻垢技术,对酸混合物的放置产生了良好的井响应,酸混合物的设计目的是溶解碳酸盐结垢,对砂岩地层、完井设备和生产设施的影响最小。所选择的固体导流剂在高温环境下与水基流体接触后,经水解自降解。该暂堵剂能够有效地将酸处理剂分布到每条裂缝中,其颗粒尺寸分布能够有效地桥接裂缝中的支撑剂充填层。井的启动产量证实了该方法带来的主要好处:与过去的常规增产措施相比,所有应用的生产率指数都更高。此外,阻垢剂的使用将增产后的油井寿命从几周延长到几个月或几年,从而减少了未来油井干预的频率。这种新颖的替代方法带来了更具成本效益的修井解决方案,并解决了海上无钻机增产作业的挑战。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Scaling Issues on Horizontal Multi-Fractured Wells: An Alternative Intervention Approach with Novel Technologies for Diversion and Scale Inhibition
In this paper we present case studies describing the approach adopted to solve scaling issues in a complex well architecture, an analysis of the scaling root causes, and the construction of a novel execution plan incorporating scale inhibitors, diverting agents with different acid systems to maximize the treatment efficiency. Even when producing at a low water cut fraction, most of the offshore multi-fractured wells in the field experienced scale deposition phenomena because of instability of the calcium ions present in the formation water. When pressure drawdown is applied on the producing wells, a progressive and severe worsening of production performance was observed, and in certain cases this led to a complete obstruction of the well. Previous stimulations executed on the under-performing wells were able to temporarily restore the production. Those treatments were performed using a conventional HCl acid system with coil tubing and these yielded positive results initially, but performance progressively decreased after a few months. For this reason, it was a priority to analyze the root cause of the deposition and define an improved method to extend the effectiveness of the intervention. Scale tendency analysis of the formation water highlighted the instability and predicted calcium carbonate presence at the reservoirs’ pressure and temperature range. Based on the evaluation of Saturation Index it was determined that calcite build-up can occur at any point in the production system. This was confirmed by field evidence, with scale deposit samples recovered at the choke, surface line and along the completion tubing. A nitrified organic acid blend was applied to invade deeply into the fracture body, together with a liquid scale inhibitor squeeze treatment that was designed to prevent further re-depositions in the short-term. A diversion technology was implemented to treat the multi-fractured horizontal wells in efficient manner by rig-less bullheading. Furthermore, due to unavailability of a rig in place, efforts were made to solve the different challenges to operate in rig-less mode: a lack of space on the production platform deck prevented any pumping intervention, and the well restart and clean up was executed directly in a high-pressure sea line. This alternative approach, with novel technologies for diversion and scale inhibition, yielded excellent well responses to the placement of the acid mixtures, which were designed to dissolve the carbonate scales with minimum impact on the sandstone formation, completion equipment, and production facilities. The selected solid diverting agent self-degraded by hydrolysis once in contact with water base fluids in the high temperature environment. This diverter was able to effectively distribute the acid treatment into each of the fractures: the particle size distribution was designed to efficiently bridge on the proppant pack in the fractures. The well start-up production rates confirmed the major benefits resulting from this approach: a higher Productivity Index was estimated on all the applications when compared to past conventional stimulations. Moreover, the use of a scale inhibitor extended the post-stimulation well life from few weeks, up to several months or years and therefore reduced the frequency of future well interventions. This novel alternative approach resulted in a more cost-effective well intervention solution and addressed the challenges of an intense offshore rig-less stimulation campaign in the field.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信