井完整性/控制

研究揭示了井诊断调查的优化

本文定义了优化井诊断调查的条件,并描述了常见井障故障的无钻机解决方案以及从操作员现场试验中吸取的经验教训。

铋珠和由此产生的铋塞。
图1-铋珠和所得的铋塞。
资料来源:SPE 216484。

完整的论文定义了优化油井诊断调查的条件,从而可以保护资源并最大限度地缩短油井故障的响应时间。它还描述了针对常见井障故障的无钻机解决方案以及从运营商现场试验中吸取的经验教训。该信息对于旨在优化持续环空压力 (SAP) 井管理流程的公司来说非常有价值。本文的主要目标是确定仅从表面数据即可识别出故障屏障元件的场景。

SAP管理

油井诊断活动可分为两类:地面活动和地下活动(油井干预)。常见的表面调查活动包括以下内容:

  • 泄放/积聚测试
  • 废水采样和分析
  • 井口密封试验
  • 修订油井历史记录
  • 泄漏率测量
  • 回波计调查
  • 压力测试
  • 示踪剂

地下井诊断可能包括以下内容:

  • 压力和温度测量
  • 腐蚀日志
  • 泄漏检测日志
  • 机械通讯测试
  • 光纤测量
  • 各种钢丝工具
  • 井下仪表的安装

井障过早失效的根本原因分析 (RCA)

对于完整性过早失效的井(当失效发生在最后一次钻机进入后 10 年内),实施了新的 RCA 流程。

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Well integrity/control

Study Sheds Light on Optimization of Well-Diagnostics Investigation

This paper defines conditions for optimized well-diagnostics investigation and describes a rigless solutions for common well-barrier failures and lessons learned from operator field trials.

Bismuth beads and resulting bismuth plug.
Fig. 1—Bismuth beads and resulting bismuth plug.
Source: SPE 216484.

The complete paper defines the conditions for optimized well-diagnostics investigation, allowing preservation of resources and minimization of response time to well failure. It also describes a rigless solutions for common well-barrier failures and lessons learned from the operator’s field trials. This information is valuable for companies aiming to optimize their sustained annulus pressure (SAP) well-management process. The main objective of the paper is to identify scenarios in which the failed barrier element can be recognized from surface data alone.

SAP Management

Well-diagnostic activities can be divided into two classifications: surface activities and subsurface activities (well interventions). Common surface investigation activities include the following:

  • Bleedoff/buildup test
  • Sampling and analysis of the effluent
  • Wellhead seal test
  • Revision of well history
  • Leak-rate measurements
  • Echometer surveys
  • Pressure tests
  • Tracers

Subsurface well diagnostics may include the following:

  • Pressure and temperature surveys
  • Corrosion logs
  • Leak-detection logs
  • Mechanical communication tests
  • Fiber-optic surveys
  • Various slickline tools
  • Installation of downhole gauges

Root Cause Analysis (RCA) of Premature Well-Barrier Failures

For wells with premature integrity failures (when the failure occurs within 10 years of the last rig entry), a new RCA process was implemented.

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