Discussion on the Application of Super-Absorbent Polymer in Gas Drilling to Dry Wellbore
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摘要: 气体钻井时地层出水可导致水敏性泥页岩坍塌失稳，为了解决这一问题，进行了超吸水材料用于井眼干燥的研究。通过室内试验对超吸水材料的吸水能力、吸水速度、抗盐能力、抗温能力、抗压能力、pH值适应性、改性方法、井筒通过能力、回收和重复利用可行性进行了评价。结果表明：超吸水材料具有吸水能力强、吸水速度快的特点；温度和压力对其吸水能力影响小；盐分对其吸水能力影响较大，但可以通过改性方法提高其耐盐性；超吸水材料吸水后可以顺利返至地面，可回收，但脱水困难，重复利用的可行性低。研究表明，超吸水材料应用于气体钻井井壁干燥在材料、工艺方面都具备可行性，可为气体钻井井壁干燥提供了新的思路和技术手段。Abstract: In gas drilling,formation water flow may lead to instability of water-sensitive mudstone and shale.To solve this problem,the feasibility of applying super-absorbent polymer(SAP)to dry wellbore was investigated.A laboratory experiment was made to evaluate the absorption capacity,absorption velocity,salt resistance,temperature resistance,compressive strength,pH value adaptability,modification methods,ability of passing through bit nozzle,recycling and reuse of such materials.The results indicate that super-absorbent materials provide strong and fast water absorption,the absorption capacity is less sensitive to temperature and pressure and highly sensitive to salt content,which can be improved by modification methods.The SAM can return to the surface successfully after absorbing water and then recycled. However,they can’t be reused because of difficult dehydration.It is suggested that super-absorbent materials are feasible in both materials and technology for drying wellbore.This research provides new ideas and methods for wellbore drying in gas drilling.
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