Improving Gas Separation in ESP for Unconventional Wells in 5-1/2" Casing. Case Studies in the Permian Basin

G. González, C. Loaiza
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引用次数: 2

Abstract

New unconventional wells have been a huge challenge for ESPs in the Permian Basin due to horizontal wells with high-formation GORs or GLRs. The pumped fluid can cause issues such as gas interference, gas locking, short run life, low production, poor energy efficiency, increased failure rates, shutdowns, so forth. A major problem is gas presence around the ESPs, because it causes the motor to rapidly overheat since the gas is incapable of adequately cooling. In short term, the presence of gas in the flow reduces the pump efficiency and in severe conditions leads to gas lock in the impeller which could damage the equipment. In the long term, the motor life is shortened as a function of the temperature increase. In general, for every 18F of operating temperature increase, the life of the insulation material is reduced by 50% and leading the motor material to be severely affected. The gas handling capacity of standard ESPs is very low, and the efficiency of the traditional rotary gas separator might not be as expected that is why a new and innovative downhole gas separator has been introduced in recent applications to combat the gas slug's problems. The new gas mitigation technology consists of a shrouded ESP with a double stage of gas separation connected at the bottom of the shroud that act as intake and was designed to break the gas slugs and avoid gas entrance into ESPs by forcing free gas to go around the shroud and produce through the casing. The fluid is now forced to pass through an additional gas separator (New Gas Mitigation Technology), which helps on gas mitigation as well as lower motor temperature This paper summarizes different case studies in wells located in the Permian Basin that had reported frequent shutdowns due to gas lock and high motor temperature. All the pump parameters are analyzed before and after the installation to conclude on optimization; in these wells, an increase on production was observed, and better performance of the pump. Other results observed were the reduction of the shutdowns and no gas mode with stable condition along with significantly breaking the drawdown barrier of the 700 psi (ESP PIP). This success was noted on most of our wells where the lowest of them operated at 290 psi (ESP PIP). Additionally, some operational and analytics guides are provided to understand how to identify and control the gas problem in ESPs.
提高5-1/2”非常规井ESP气体分离性能二叠盆地的案例研究
在二叠纪盆地,由于水平井具有较高的gor或glr,新的非常规井对esp来说是一个巨大的挑战。泵送的流体会导致诸如气体干扰、气锁、运行寿命短、产量低、能源效率低、故障率增加、停机等问题。一个主要问题是esp周围存在气体,因为气体无法充分冷却,这会导致电机迅速过热。在短期内,流体中存在气体会降低泵的效率,在严重的情况下会导致叶轮中的气体锁住,从而损坏设备。从长远来看,电机寿命随着温度的升高而缩短。一般情况下,工作温度每升高18F,绝缘材料寿命降低50%,导致电机材料受到严重影响。标准esp的气体处理能力非常低,传统旋转气体分离器的效率可能不如预期,这就是为什么在最近的应用中引入了一种新型的井下气体分离器来解决气段塞问题。新的气体减缓技术包括一个带保护罩的ESP,其双层气体分离层连接在保护罩的底部,作为进气口,其设计目的是通过迫使游离气体绕过保护罩并通过套管产生,从而打破气体段塞,避免气体进入ESP。现在,流体被迫通过一个额外的气体分离器(新型气体缓解技术),该技术有助于气体缓解和降低马达温度。本文总结了位于二叠纪盆地的油井的不同案例研究,这些井由于气锁和马达温度高而频繁关闭。对泵安装前后的各项参数进行分析,得出优化结论;在这些井中,观察到产量增加,泵的性能更好。其他观察到的结果是减少了关井次数,稳定状态下无气体模式,同时显著打破了700 psi (ESP PIP)的压降障碍。我们在大多数井中都取得了成功,其中最低压力为290 psi (ESP PIP)。此外,还提供了一些操作和分析指南,以了解如何识别和控制esp中的气体问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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