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一、问题的提出D_L型水泥减阻剂的研制成功为地质钻探水泥护壁堵漏施工中改善浆液流动性、调查可泵性、满足泵送灌注要求提供了理想的水泥外加剂。通过现场生产试用表明：D_L减阻剂的应用，不仅提高了钻孔护壁堵漏的成功率，而且为安全施工、缩短候凝时间、进而间接地提高钻速、降低成本提供了有利条件和保证。在生产实践和室内探索试验中，欲合理使用水泥外加剂，需要解决的一个重要问题乃是如何选用不同品种的水泥，其次为根据水泥护壁堵漏的不同目的和条件，达到在灌注施工中满足浆液各性能（流动度、可泵性、初终凝时间，以及不同时期的强度等）的需求，来考虑浆液所采用的（水灰比和不同外加剂加量）最优配方。
First, the problem raised D_L-type cement drag reducer successfully developed for the geological drilling plugging wall construction to improve slurry flowability, to investigate pumpability, to meet the requirements of pumping and pouring provides an ideal cement admixture. The trial production through on-site production shows that the application of D_L drag reducing agent not only improves the success rate of plugging and plugging on the borehole, but also provides favorable conditions and guarantees for safe construction, shortening the waiting time for coagulation, and indirectly increasing the drilling speed and reducing costs . In production practice and indoor exploration test, to use cement admixture reasonably, an important problem to be solved is how to select different types of cement, followed by different purposes and conditions of cement wall plugging, to meet the needs of filling construction The optimal formulation of the slurry (water-cement ratio and different admixtures) is taken into consideration in the slurry’s properties (fluidity, pumpability, initial and final setting time, strength at different times, etc.).