基于响应面试验的深厚覆盖层植物胶成膜冲洗液体系研究

Research on plant gum film-forming drilling fluid system for deep overburden layers based on response surface experiment

摘要:

随着矿产资源的加速消耗，以及国家新一轮找矿突破战略的提出，对地质钻探环境复杂的深厚覆盖层地区勘探找矿提出了新的要求。绳索取心钻探广泛应用于复杂地层钻进。为提高其在深厚覆盖层的钻进效率和岩心采取率，维持孔壁稳定，开展环保植物胶成膜冲洗液体系研究，通过优选试验确定魔芋胶作为成膜基体，在此基础上进一步筛选确定成膜助剂PVA、流变改性剂HJ、聚胺类防塌抑制剂AB?1；然后基于响应面试验优化配方得到植物胶成膜冲洗液体系K?PA：0.3%魔芋胶+0.9% PVA+0.6% HJ+1% AB?1+0.2%纯碱，并分析了其成膜防塌机理；该冲洗液体系具有突出的成膜降滤失与抑制水化特性实现防塌护壁，针对深厚覆盖层具有良好适配性，性能测试结果同模型预测值高度吻合，证明响应面试验设计可靠性高。研究成果为解决复杂地层问题提供了新思路，同时对新型环保无固相冲洗液研制也具有一定的借鉴意义与参考价值。

Abstract:

With the accelerating consumption of mineral resources and the introduction of the national new round of mineral prospecting breakthrouch strategy， new requirements have been put forward for exploration and prospecting in complex deep overburden layer， where the geological drilling environment is complex. Wire-line core drilling technology is widely used for drilling in the complex strata. To enhance the drilling efficiency and core recovery of wire-line coring drilling in deep overburden layers， and to maintain borehole wall stability， an environmentally friendly plant-gum film-forming drilling fluid system was developed. Through optimization tests， konjac gum was selected as the film-forming matrix. On this basis， the film-forming aid PVA， the rheology modifier HJ， and polyamine anti-sloughing inhibitor AB-1 were further identified. Based on the response surface test， the optimized formulation K-PA of the plant-based film-forming drilling fluid was obtained， that is 0.3% konjac gum + 0.9% PVA + 0.6% HJ + 1% AB-1 + 0.2% soda ash， moreover， its film-forming and anti-sloughing mechanism was analyzed. This drilling fluid system exhibits outstanding film-forming filtration reduction and hydration inhibition capabilities to achieve anti-sloughing and wall protection， showing good adaptability to deep overburden layers. The performance test results are highly consistent with the model predictions， demonstrating the high reliability of the response surface test design. The research results provide a new approach for solving complex formation problems， and also offer certain reference significance for the development of new environmentally friendly solid-free drilling fluids.