西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (6): 155-164.DOI: 10.11885/j.issn.1674-5086.2019.10.23.01

• 页岩气开发专刊 • 上一篇    下一篇

页岩气井环空带压临界控制值计算方法

张智1, 丁剑1, 赵苑瑾1, 邓虎2, 卢齐2   

  1. 1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川 成都 610500;
    2. 中国石油川庆钻探工程有限公司钻采工程技术研究院, 四川 广汉 618300
  • 收稿日期:2019-10-23 出版日期:2019-12-10 发布日期:2019-12-10
  • 通讯作者: 张智,E-mail:wisezh@126.com
  • 作者简介:张智,1976年生,男,汉族,四川南充人,教授,博士生导师,主要从事油气井工程教学和科研工作。E-mail:wisezh@126.com;丁剑,1995年生,男,汉族,四川南充人,博士研究生,主要从事油气井工程、井筒完整性管理及风险分析方面的研究工作。E-mail:swpu_dj@qq.com;赵苑瑾,1996年生,女,汉族,四川巴中人,硕士研究生,主要从事油气井工程、井筒完整性管理及风险分析方面的研究工作。E-mail:215190043@qq.com;邓虎,1974年生,男,汉族,高级工程师,博士,主要从事气体钻井、欠平衡钻井的研究工作。E-mail:dengh@cnpc.com.cn;卢齐,1986年生,男,汉族,四川内江人,工程师,硕士,主要从事钻完井工程方面的研究。E-mail:luqccde@cnpc.com.cn
  • 基金资助:
    国家科技重大专项(2016ZX05026-002;2016ZX05028-001-006);高等学校学科创新引智计划(111计划)(D18016);中国石油科技创新基金(2017D-5007-0315)

Calculation Method of Critical Control Value of Sustained Annular Pressure in Shale Gas Well

ZHANG Zhi1, DING Jian1, ZHAO Yuanjin1, DENG Hu2, LU Qi2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Drilling&Production Technology Research Institute, CNPC Chuanqing Drilling Engineering Co. Ltd., Guanghan, Sichuan 618300, China
  • Received:2019-10-23 Online:2019-12-10 Published:2019-12-10

摘要: 页岩气井由于大规模压裂导致井筒完整性破坏而引起大量环空带压问题,严重影响页岩气井的安全生产。针对页岩气井环空带压问题,基于API RP 90-2环空带压临界控制值计算方法,考虑页岩气井储层压力、产量变化、腐蚀以及磨损等因素,分析实际生产中环空各组件承压能力随服役时间的变化情况,建立了页岩气井环空带压临界控制值计算方法及环空带压控制图版,并进行了实例计算。研究结果表明,页岩气井环空带压临界控制值在服役早期主要受井口装置、技术套管承压能力影响,到服役后期时,随着腐蚀及地层压力降低,主要受油管薄弱点抗外挤强度影响,且随服役时间、腐蚀速率增加而不断降低,当环空带压控制值小于地层压力时,需要对环空压力值进行监测并采取相应措施,以保证现场安全生产。

关键词: 环空带压, 磨损, 环空带压管控, 页岩气井, 安全图版

Abstract: Large scale fracturing of shale gas wells leads to the destruction of well integrity, a sustained annulus pressure problems, seriously affecting the safe production of shale gas wells. Aiming at the problem of annular pressure in shale gas wells, based on the calculation method of critical control value of annular pressure in API RP 90-2, considering the factors such as formation pressure, production change, corrosion and wear of shale gas wells, the change of pressure bearing capacity of each annulus component with service time in actual production is analyzed, the calculation method of critical control value of sustained annular pressure and its control chart are established in this paper, and an example is given. The results show that the critical control value of annular pressure in shale gas well is mainly affected by the pressure bearing capacity of wellhead device and technical casing in the early stage of service. In the late stage of service, with the decrease of corrosion rate and formation pressure, it is mainly affected by the external extrusion strength of weak point of tubing, and it decreases with the increase of service time and corrosion rate. When the control value of annular pressure is less than formation pressure, it is necessary to monitor the sustained annulus pressure value and take corresponding measures to ensure the safety of production on site.

Key words: sustained annular pressure, wear, sustained annular pressure control, shale gas well, safety plate

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