Anti-Gas Channeling Technology with Gas-Block Plug for High Temperature and High Pressure Wells in the Periphery of the Tahe Oilfield
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摘要: 为解决新疆塔河外围奥陶系高温高压储层钻井过程中气窜速度过快等难题，对油气上移规律和影响因素进行分析，认为影响油气上窜的主要因素是井筒内流体的凝胶强度和表面张力。为此，优选了抗高温流性调节剂SMRM、表面张力调节剂SMSM和抗高温降滤失剂SMPFL等气滞塞用关键处理剂，形成了高温高压井气滞塞防气窜技术。室内试验表明，气滞塞抗温达200℃，表面张力低于22 mN/m，高温下凝胶强度大于30 Pa，且与井浆具有较好的配伍性。气滞塞防气窜技术在塔河油田外围5口气侵严重的井进行了应用，分别配合起钻、测井、取心和完井等进行施工作业，气窜速度降低75%以上，延长了安全作业时间，提高了钻井完井安全和效率。研究与应用表明，抗高温气滞塞防窜技术为高温高压气侵储层段的钻井完井施工提供了一种安全有效的井控手段。Abstract: Excessive gas channeling velocity is a big challenge in the Ordovician high-temperature and high-pressure(HTHP)reservoirs along the periphery of the Tahe Oilfield,Xinjiang.To solve this problem,an analysis was conducted on the mechanisms and influencing factors of oil/gas migration.The study concluded that the main factors affecting the oil/gas migration were the gel strength and the surface tension of fluids in the wellbore.Hence,researchers developed an anti-gas channeling technology with gas-block plug.In this process,researchers selected key treatment agents for gas blocking,such as high temperature rheological modifier SMRM,surface tension modifier SMSM and high temperature fluid loss additive SMPFL.Thus it was possible to match high temperature resistant gas-block plug regimes and processes.The gas-block plug is resistant temperature as high as 200℃,while the surface tension was lower than 22 mN/m.When the gel strength was higher than 30 Pa at high temperature,there was a good level of compatibility with the mud in the wellbore.The anti-gas channeling technology were applied in 5 wells with severe gas invasion in periphery of the Tahe Oilfield.The techniques were then respectively matched with the operations like drilling,logging,coring and completion.The application results showed that the gas channeling velocity was reduced by more than 75%,the safety operation period was extended,and the drilling safety and efficiency were improved.The successful development and application of high temperature resistant gas-block plug could provide a safe and effective well control measure for the drilling and completion of gas invasion HTHP reservoirs.
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Keywords:
- gas-block plug /
- anti-gas channeling /
- high temperature /
- high pressure /
- gel strength /
- Tahe Oilfield
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