DFC非漂珠低密度水泥浆体系实验研究

Experimental study of DFC non floating bead low density cement slurry system

贾维君

JIA Weijun

大庆石油管理局钻探集团钻井工程技术研究院，黑龙江大庆　163413

Drilling Engineering Technology Research Institute of Daqing Petroleum Administration Bureau, Daqing 163413, China

常规漂珠的批量生产受到限制，且漂珠低密度水泥存在高压体积收缩等问题，为此，进行了非漂珠低密度水泥浆体系研究。以颗粒的合理级配及紧密堆积为理论基础，通过水泥石抗压强度、水泥浆沉降稳定性及超声波实验优选了FC-1、FC-2、FC-3及FC-4低密度水泥外掺料，并通过合理的外掺料配比及优选低密度水泥浆配套外加剂进行失水、水泥浆稠化及地面模拟等试验，研制出密度为1.40～1.50 g/cm3的DFC非漂珠低密度水泥浆体系，该体系具有高强度、抗高温衰退等特点，能够替代普通漂珠低密度水泥浆在油井固井中应用，其整体性能满足油田固井及后期开发的需要。地面模拟试验表明，常规的干混设备能够满足该体系的均匀混拌需求，该体系具有良好的施工可行性。

The conventional floating bead low density slurry is restricted by the batch production of floating beads. Since the high pressure volume of the floating bead low density cement contracts, as a result, the slurry density increases. Based on the rational gradation and close packing of particles, through conducting experiments on the compressive resistance of cement pastes, the cement slurry subsiding stability and the supersonic wave, the FC-1, FC-2, FC-3, and FC-4 low density slurry additives are selected out. Through rational additives proportioning and selection of low density slurry additives, the experiments on dehydration, slurry densification, and surface simulation are conducted. The DFC non floating bead low density cement slurry of which the density ranges from 1.40 g/cm3 to 1.50 g/cm3 is developed. The slurry system features in high intensity and high fading-resisting ability. It can be applied to the oil well cementing by replacing the commonly used floating bead low density slurry. The integral performance of the system can meet the requirement of the oilfield cementing and the latter oilfield development. Field surface stimulating test shows that the conventional dry mixing equipment can meet of demand of the system for uniformly mixing. The slurry system has great feasibility for operation.