Development and Experiment of Low-Density and Solid-Free Foam Workover Fluid for Low Pressure Gas Reservoir
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摘要: 在产能低、漏失量大的低压气层,使用常规修井液时会带来排液困难、地层伤害严重、产能难以恢复等问题,为此,在可循环泡沫钻井液的基础上,通过添加高效两性离子型发泡剂及稳泡剂,使其能够形成具有特殊结构的微泡状材料,研制了一种保护储层的低密度无固相泡沫修井液。该修井液的泡沫密度达到0.50~0.95 kg/L,黏度不大于90 mPa·s,100 ℃温度下的稳定时间达到24 h。室内性能试验表明:该修井液储层伤害率和滤失量低,堵漏效果良好,温度、压力对其稳定性影响较小。在新疆八二西80104井的现场试验表明,该修井液性能稳定,防漏堵漏效果良好。研究认为,低密度无固相泡沫修井液可在井漏严重、储层水敏和水锁严重的低压气藏应用,能有效保护储层,提高气井产量。Abstract: For low production, high fluid loss, and low pressure gas formations, the application of conventional workover fluid may result in drainage difficulties, formation damage and production recovery. A low density and solid-free foam workover fluid was developed by adding high effective amphoteric ionic foaming agent and foam stabilizer in the circulating foam drilling fluid to make it form micro bubble materials with a special structure. Its density is between 0.50 and 0.95 kg/L, viscosity is less than 90 mPa·s, and stabilization time is 24 h under 100 ℃. Comprehensive experimental results indicated that the kind of workover fluid has a slight damage to payzone, with low filtration rate and good plugging effect, the influence of temperature and pressure on the workover fluid is not serious. Its application in Well Ba-II Xi 80104 of Xinjiang indicated that this bubble workover fluid performed very well to ensure smooth completion and workover operation and might be used in high fluid loss, strong water-sensitive, and water lock low pressure gas reservoirs.
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Keywords:
- low pressure reservoir /
- gas well /
- solid-free /
- foam /
- workover fluid /
- surfactant
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