高强超低密度水泥浆体系研究

国内外利用颗粒级配和紧密堆积理论研究开发了1．20～1．65g／cm^3的低密度水泥浆体系，解决了固井中的技术难题，取得了比较满意的效果。随着勘探开发复杂古潜山油藏、海相碳酸岩盐裂缝油藏，保护油层、保护套管的需要，对水泥浆提出了更高的要求。特别是超深井、高温度、长封固、平衡压力固井施工，要求水泥浆超低密度、高强度、体积不收缩。目前，国内外还没有水泥浆密度低于1．10g／cm^3的超低密度体系的应用报道 。通过采用美国3M公司的高强低密度人造空心微珠，进行了超低密度水泥浆体系的试验，在水泥浆密度达到1．04～1.10g／cm^3时，依然具有较高的强度和较好的水泥浆性能，可以应用到超深井、超长封固的固井施工中.

RESEARCH ON HIGH STRENGTH AND LOW DENSITY CEMENT SLURRY SYSTEM

Low density cement slurry system with 1.20-1.65 g/cm3 has been developed based on grain composition and close packing theory. It solved the cementing problems and achieved satisfied effects. The requirements on reservoir protection and casing protection have been raised with the exploration and development of Guqianshan reservoir. Especially for some ultra-deep wells, high temperature wells, long section and balanced pressure cementing operation, cement slurry system with lower density, higher strength and non shrinkage performance are required. By applying the high strength and low density artificial hollow glass microsphere from 3M(U.S.Company), the test of ultra-low density cement slurry system was carried out. When the cement slurry density arrived at 1.04-1.10 g/cm3, the cement slurry had high strength and better performance, it can be applied in ultra-deep wells and long section cementing operation.