为了解决常规泡沫水泥存在的密度高、泡沫不稳定、抗压强度低、孔隙度高、有效期短等缺点,研发了一种新型的胶质气体泡沫（CGA）基泡沫水泥体系并进行性能评价。将CGA作为泡沫组分加入基浆,从优化粒度分布的角度考虑加入空心球和微硅石继续优化配方。通过孔隙度、渗透率、强度、脆性、弹性、自由水含量、泡沫稳定性和密度测试等评价CGA基泡沫水泥体系性能,实验结果表明：泡沫占比为10%时,水泥密度降到1 040 kg/m3;水泥体系中形成了稳定的微泡网络结构且不受高温高压影响;最优CGA基泡沫水泥自由水含量为零,孔隙度为24%,渗透率为0.7×10-3 μm2,弹性模量低、泊松比高,抗压强度合理,表现出韧性特征,具有更强的弹性和柔性,可承受区域地应力。图6表3参22
VELAYATI Arian
,
ROOSTAEI Morteza
,
RASOOLIMANESH Rasool
,
SOLEYMANI Mohammad
,
FATTAHPOUR Vahidoddin
. 胶质气体泡沫基泡沫水泥体系[J]. 石油勘探与开发, 2019
, 46(6)
: 1206
-1211
.
DOI: 10.11698/PED.2019.06.18
To solve the problems such as high denstiy, foam instability, low compressive strength, high porosity and short valid period associated with conventional foam cements, a novel colloidal gas aphron (CGA) based foam cement system was investigated and tested for properties. CGA is used in a base slurry as the foam component and the recipe was optimized with hollow sphere and micro-silica in terms of particle size distribution (PSD). Porosity, permeability, strength, brittleness, elasticity, free water content, foam stability and density tests on the CGA based foam cement system were carried out to evaluate the performance of the system. According to the experiment results, at the foam proportion of 10%, the cement density was reduced to 1 040 kg/m3, and stable microfoam net structure not affected by high temperature and high pressure was formed in the cement system. The optimal CGA based foam cement has a free water content of 0%, porosity of 24%, permeability of 0.7×10-3 μm2, low elasticity modulus, high Poisson’s ratio, and rational compressive strength, and is more elastic and flexible with capability to tolerate regional stresses.
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