The Preparation and Properties of a Gel Plugging Agent Made from Copolymerization of Modified Carbon Nanotube
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摘要: 凝胶封堵剂通常具有自适应性较强的特点，但现有钻井液用凝胶封堵剂普遍存在抗温性及强度较差的问题。合成了一种抗高温碳纳米管杂化三元共聚物材料作为水基钻井液的封堵剂，以三元共聚凝胶为基体，以碳纳米管（CNTs）为刚性纳米颗粒，以期解决深井高温环境下封堵剂失效引起的井壁失稳等问题。通过分子结构设计，优选顺丁二烯酸酐（MAH）、烯基琥珀酸酐（ASA）、苯乙烯（St）为共聚物反应单体，过氧二苯甲酰（BPO）为引发剂，N,N-亚甲基双丙烯酰胺（MBA）为交联剂，采用自由基聚合法合成了一种纳米纤维封堵剂。通过透射电镜、砂盘封堵实验对其功能结构及封堵性能进行评价。结果表明，合成的抗高温碳纳米管杂化三元共聚凝胶封堵剂在钻井液中加量为1.0%时获得最优封堵能力，在150℃高温下，具有良好的流变性能，降滤失效果显著，对于纳微米尺寸孔缝均可有效封堵。Abstract: Gel plugging agents usually have the characteristic of good adaptiveness, but the existing drilling fluid gel plugging agents generally suffer from poor stability at elevated temperatures and poor strength. To deal with these problems, a drilling fluid plugging agent was developed by the hybridization of high temperature carbon nanotubes and a terpolymer; the terpolymer gel is used as the matrix and the carbon nanotubes (CNTs) are used as the rigid nanoparticles to aim to solve the problems such as borehole wall instability resulted from the failure of the plugging agents at elevated temperatures in deep well drilling. A nanofiber plugging agent was synthesized by radical polymerization based on a molecular structure design in which maleic anhydride (MAH), alkenyl succinic anhydride (ASA) and styrene (St) were selected as the copolymerization monomers, benzoyl peroxide (BPO) as the initiator, and N, N-methylenebisacrylamide (MBA) as the crosslinking agent. The synthesized high temperature hybridized carbon nanotubes and terpolymer gel plugging agent was evaluated for its functional structures and plugging performance by transmission electron microscopy and sand-disc plugging experiment. The results of the evaluation show that, a drilling fluid treated with 1.0% of the synthesized product has the optimal plugging capacity. At 150℃, the drilling fluid has good rheological properties, good filtration control effect, and can effectively plug nano-micron sized pores and fractures.
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Key words:
- Drilling fluid /
- Carbon nanotube /
- Terpolymer /
- Plugging agent
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