深水井测试安全控制技术

Safety control technology of deepwater oil and gas well testing

防止深水油气井测试事故发生的关键之一,就是必须进行安全评估与控制,提高测试工艺水平。我国南海深水海域有其特殊的区域环境特点:油田离岸距离远、夏季台风频繁、冬季季风不断、存在沙坡、沙脊和内波流等,而且油气藏特性复杂,给深水井测试带来更多的挑战。结合南海深水井测试实践,对深水井测试的主要潜在风险进行了分析,认为存在测试管柱及工具失效、地面流程失效、天然气水合物堵塞、储层出砂、台风影响等风险。针对这些风险提出了具体的防范措施。

Due to the high dififculties, high investment, and high risks in deepwater oil and gas well testing, major safety problems can occur easily. A key to prevent accidents is to conduct safety assessment and control on deepwater testing and to improve the test-ing technology. The deepwater of the South China Sea has some special environmental features: long distancce from offshore, frequent typhoons in summer and constant monsoons in winter, and the prsence of sandy slopes, sandy ridges and internal waves, which, coupled with the complex properties of oil and gas reserves, bring more challenges to deepwater well testing. In combination with deepwater well testing practice in the South China Sea, this paper analyzes the main potential risks in deepwater well testing and concludes that there are risks of failure in testing string and tools and ground processes, gas hydrate blockage, reservoir stratum sanding, and typhoon impacts. Speciifc precautions are also proposed in response to these risks in the paper.