俄罗斯欠平衡钻井首次在钻井液原油中使用固体混凝剂

V. N. Averkin, Andrey Krylov, Petr Leonidovich Ryabtsev, Yury Valerievich Lukovkin
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引用次数: 2

摘要

油基钻井液提供了相当大的优势,但是它们也有一些局限性,主要与钻井液系统被钻井固体和地层水污染有关。主要目标是在井长过程中,在钻井液进入系统的第一个循环中,从钻井液中去除固体。这些固体被定义为悬浮粒子的浓度。目前的固控设备无法清除产生的钻屑,因为没有第一阶段的固控设备——页岩振动筛;因此,岩屑转变为细小固体,并以胶体颗粒的形式积累,导致悬浮颗粒浓度增大,降低了储层的钻进质量。为了满足要求,即高质量的储层钻井,有必要确保在岩屑移动的第一个周期内有效清除岩屑。2018年,Surgutneftegaz计划并在Talakanneft现场办公室对AKROS固体混凝剂(以下简称混凝剂)进行现场测试。测试结果可以得出混凝剂在钻井液-原油(以下简称原油)中使用的具体特征,并确定油藏钻井优化的潜力,从而扩大其适用性。作为Surgutneftegaz油田新技术解决方案实施计划的一部分,使用了额外的实验室设备来获取扩展数据,从而实现了对分支井延长的新解释。在Surgutneftegaz油田,使用混凝剂钻了一口加长分支井。混凝剂的现场测试结果使钻井性能指标得到了以下改善:减小扭矩,降低起钻时工具重量,改善将载荷传递给钻井工具,提高机械钻速,降低悬浮颗粒浓度,去除原油中的地层水。悬浮颗粒浓度的结果允许在完成井长或将其注入具有最低悬浮颗粒浓度的油藏后,将原油转移到下一口井/段。使用混凝剂处理原油可以降低加热元件失效的风险,减少油井延长使用的原油量,并确保其重复使用,无需额外更换和/或稀释。混凝剂的使用表明,当硬石膏与原油中的水接触时,它可以降低生产地层中硬石膏的膨胀活性,使油井加长作业更具技术性。混凝剂的使用结果促进了混凝剂的现场应用实践的发展,对原油性质控制提出了建议,并对原油中固体含量降低和水相脱乳化的效率进行了对比分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
First Use of Coagulant for Solids in the Drilling Fluid Crude Oil for Underbalanced Drilling in Russia
Oil-base drilling fluids provide considerable advantages, however they have a number of limitations mainly related to drilling fluid system contamination with drill solids and formation water. The primary objective is to remove solids from the drilling fluid during the first cycle of their entering into the system in the course of well lengthening. These solids are defined as the concentration of suspended particles. Current solids control equipment does not remove the generated drill cuttings due to the absence of the first stage of solids control – shale shakers; therefore the cuttings transform into fine solids and accumulate as colloidal particles causing the growth of the concentration of suspended particles and reducing reservoir drilling-in quality. To meet the requirement, i.e. quality reservoir drilling-in, it is necessary to ensure effective cuttings removal during the first cycle of their movement. In 2018 Surgutneftegaz planned and performed field tests of the AKROS coagulant for solids (hereinafter – Coagulant) at the Talakanneft Field Office. The test results enabled conclusions on specific features of the Coagulant use in the drilling fluid – crude oil (hereinafter – crude oil) and identification of the potential for reservoir drilling-in optimization that may expand its applicability. As part of the New Technological Solution Implementation Program at Surgutneftegaz fields, additional lab equipment was used to obtain extended data, enabling a new interpretation of multilateral well lengthening. A lengthened multilateral well was drilled at a Surgutneftegaz field using the Coagulant. Coagulant field test results enabled the following improvements in drilling performance indicators: –reduced torque;–reduced tool weight during pulling out;–improved transfer of load to drilling tool;–increased ROP;–reduced concentration of suspended particles;–removal of formation water from crude oil. Results achieved on the concentration of suspended particles allow the transfer of crude oil to the following well/interval upon the completion of well lengthening or its injection into an oil reservoir with the minimum concentration of suspended particles. Crude oil treatment with the Coagulant will mitigate risks of heating elements failure, reduce the crude oil volume used for well lengthening, and ensure its reuse without additional replacements and/or dilutions. The use of the Coagulant demonstrated the ability to reduce the swelling activity of anhydrite occurring in the producing formation when it comes in contact with water contained in the crude oil, making well lengthening operations more technological. Results of the Coagulant use enabled the development of field practices of its application and recommendations on crude oil properties control as well as performance of comparative analysis of the efficiency of solids content reduction and water phase de-emulsification in the crude oil.
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