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在煤粉填充物理模型 (煤心 )上 ,在室温下考察了过滤活性水、线性胶、滤去残渣的冻胶破胶液对渗透率的伤害。讨论了伤害煤层渗透率的两大因素 :压裂液堵塞煤层割理 ;煤基质吸附压裂液而膨胀。所设计的煤心实验反映后一种因素的影响。实验结果表明 ,对于两种煤心的渗透率 ,线性胶的伤害率高达 82 .7%和 91.4 % ,活性水的伤害率很小 ,仅为 11.5 %和 3.2 % ;冻胶破胶液对另外两种煤心渗透率的伤害也相当高 ,达 81.1%和 5 4 .5 %。这些数据反映水基压裂液对不同煤化阶段煤层的伤害程度有较大差别。以羟丙基瓜尔胶作降阻剂的线性胶 ,其严重伤害来自吸附膨胀和残渣堵塞两个方面 ,但在地面压力太高的深井仍需使用此种压裂液。冻胶压裂液极易对煤层造成严重而不能解除的伤害 ,应慎重选择配方。对于煤层井的压裂 ,活性水压裂液的伤害最小。图 6表 1参 5。
In the physical model of coal-filled coal (coal), we investigated the effect of filtration of active water, linear gel and gel-residue solution on the permeation rate of the gel at room temperature. Discusses the two factors that hurt the permeability of coal seam: fracturing fluid clogging coal seams; coal matrix adsorption of fracturing fluid and expansion. The designed coal heart experiment reflects the influence of the latter factor. The experimental results show that the damage rate of linear rubber is as high as 82.7% and 91.4% for the permeability of coal and coal, and the damage rate of active water is only 11.5% and 3.2% respectively. Damage to the permeability of both coal hearts is also quite high, reaching 81.1% and 54.5%. These data reflect that water-based fracturing fluid has great difference in the degree of damage to coal seam in different coalification stages. Hydroxypropyl guar as a viscosity reducer linear glue, the serious injury from the adsorption and expansion of the clogging of two residues, but the ground pressure is too high in deep wells still need to use this kind of fracturing fluid. Jelly gel fracturing fluid is extremely easy to cause serious damage to the coal seam, should be carefully selected formula. For the fracturing of coal seams, the active water fracturing fluid has the least damage. Figure 6 Table 1 reference 5.