Molecular Structure and Performance of Oligomeric Amine Shale Inhibitor
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摘要: 考察了低聚胺分子结构对页岩热滚回收率、滤失量和吸附行为的影响。结果显示,低聚胺分子中烃结构和氨基的存在能导致回收率和滤失量同时增加,只不过氨基的影响力要弱,而醚氧和羧甲基则导致回收率和滤失量同时降低;氨基是最强吸附基团,醚氧和烃次之,羧甲基会对吸附性能产生负面的影响。所有低聚胺均单层平铺在黏土层间,这种吸附形态有利于形成最小黏土层间距,从而抑制页岩膨胀。聚醚胺D230是筛选出来的最优胺类抑制剂,其疏水、亲水基团搭配合理,能兼顾钻井液的抑制性和造壁性。以D230为主剂,添加少量的五乙烯六胺和自制的二元共聚物制备的聚胺产品RZPA在四川德阳的江沙33-8气井应用,掉块较少,且无大的掉块,页岩热滚回收率在73%~81%之间,钻井顺利。Abstract: Oligomeric amines were investigated for the effect of their molecular structures on their inhibitive capacity, API filter loss and adsorption behavior. The presence of hydrocarbon and amino groups in the oligomeric amine molecules results in an increase in the API filter loss of a mud treated with oligomeric amine, although the effect of amino group is weaker than that of the hydrocarbon group. The ether group and carboxymethyl group reduce the filter loss of a mud. Amino group is the strongest adsorption group, followed by ether group and hydrocarbon group. Carboxymethyl negatively affect the adsorption of mud additives. All the oligomeric amines, when adsorbed, form single layer on the surface of clay particles, which is beneficial to the formation of a minimum spacing between the unit layers of clay, thereby preventing clay from swelling. A polyamine additive, RZPA, made from polyetheramine D230, the best amine shale inhibitor, was used in drilling the well Jiangsha33-8 in Deyang, Sichuan. Good inhibitive capacity was found when drilling water sensitive shales. Hot rolling test showed that RZPA had percent recovery of shale samples between 73% and 81%.
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Key words:
- Drilling fluid /
- Shale inhibitor /
- Oligomeric amine /
- Structure /
- Performance
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