Laboratory Research on Deepwater GTL Synthetic-Based Drilling Fluid
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摘要: 深水钻井面临低温、安全密度窗口窄、浅层气易形成气体水合物、井壁易失稳等技术难题,对深水钻井液提出了更高的要求。通过研究乳化剂加量、有机土加量、水相体积分数对深水气制油合成基钻井液低温流变性和电稳定性的影响,配制了一种深水气制油合成基钻井液,其配方为80%气制油+20%CaCl2盐水+3%RHJ+3%有机土+3%HiFLO+2%CaO,并研究了其低温流变性、抑制天然气水合物生成的能力和储层保护能力。研究结果表明:该钻井液具有较好的低温流变性,动切力几乎不受温度影响,在较大的温度变化范围内保持稳定;在20 MPa甲烷气体、0℃温度条件下能有效抑制天然气水合物的生成;能有效保护油气储层,其渗透率恢复率达85%以上,可以满足海洋深水钻井的要求。Abstract: The technical problems in deepwater drilling such as low temperature,narrow window of safety density,possible hydrate formation by shallow natural gas,and hole slough,etc.,have set high requirement on drilling fluids.A deepwater GTL synthetic-based drilling fluid was developed by studying the amounts of emulsifier and organic clay added,and the water volume fraction effect on low temperature rheological properties and electric stability of the drilling fluid,the formula is 80%GTL and 20%CaCl2 in volume,adding 3%RHJ(compound emulsifier),3% organic clay,3%HiFLO,2%CaO,its low temperature rheological properties,ability to inhibit gas hydrate,and reservoir protection ability for drilling fluid were studied.The results show that the drilling fluid has better low temperature rheological properties,the yield point of the drilling fluid is nearly independent of temperature,it keeps stablity over a wide temperature range;the drilling fluid can effectively inhibit gas hydrate formation under the pressure of 20 MPa CH4 at the temperature of 0℃;and can effectively protect reservoirs,with permeability recovery over 85%,it can meet the requirements of deepwater drilling.
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Keywords:
- deepwater drilling /
- gas-to-liquid /
- synthetic-based drilling fluid /
- low temperature /
- rheology /
- gas hydrate
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