通过室内实验研究不同阳离子浓度和类型对瓜胶、黄原胶以及部分水解聚丙烯酰胺（HPAM）交联凝胶流变性和稳定性的影响,提出利用多壁碳纳米管（MWCNT）降低阳离子负面影响的思路。交联凝胶体系中阳离子的存在会降低交联凝胶的黏度,阳离子浓度越高,黏度降低幅度越大,二价阳离子比一价阳离子降低黏度的幅度更大。阳离子会降低交联凝胶的稳定性,并且在较高盐度条件下更为严重。在HPAM凝胶中添加MWCNT,同时利用3-氨丙基三乙氧基硅烷（APTES）进行交联,MWCNT可以包围阳离子并将其从聚合物上剥离,降低阳离子与聚合物发生反应的可能性,从而使得交联凝胶黏度和破裂压力均得到提高,提高HPAM交联凝胶在不同作业条件下的稳定性,可用于相关的钻井作业。图20表2参19
SEDAGHATZADEH Mostafa
,
SHAHBAZI Khalil
,
POURAFSHARY Peyman
,
RAZAVI Seyed Ali
,
SEDAGHATZADEH Mostafa
,
SHAHBAZI Khalil
,
POURAFSHARY Peyman
,
RAZAVI Seyed Ali
. 阳离子对交联聚合物凝胶体系性能的影响[J]. 石油勘探与开发, 2019
, 46(4)
: 782
-788
.
DOI: 10.11698/PED.2019.04.18
The effects of different cation concentrations and types on rheological property and stability of Guar, Xanthan, and Partially Hydrolyzed Polyacrylamide (HPAM) cross-linked gels were analyzed through experiments. Also, a new approach was developed to reduce the negative effects of cation by application of multi-walled carbon nano-tubes (MWCNTs). The presence of cations in cross-linked gel system will reduce the viscosity of gel, the higher the cation concentration is, the lower the viscosity will be. The bivalent cation has a greater viscosity reduction effect on gel than monovalent cation. The stability of cross-linked gels is worse with cations, this situation becomes more serious under higher salinity. MWCNTs were added to HPAM gel, cross-linked by (3-Aminopropyl) triethoxysilane (APTES), they surrounded cations and removed them from polymers and reduced the reaction possibility. This method enhances the viscosity and breakdown pressure of cross-linked gels, improves the stability of HPAM cross-linked gel under different operating conditions, and can be applied to related drilling projects.
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