深层致密砂岩储层聚合物减阻剂的研究及应用

doi:10.3969/J. ISSN.1006-768X.2022.05.24

摘要/Abstract

摘要： 长庆油田庆阳气田山西组山１段储层属于典型的超低孔、超低渗致密砂岩储层，常规的水平井分段压裂技术未能取得良好的改造效果。为了提高低渗致密砂岩储层的改造效果，文章研发了一种具有良好抗盐减阻性能的聚合物减阻剂，满足致密砂岩储层体积压裂的施工要求。该减阻剂以丙烯酸、丙烯酰胺、２-丙烯酰胺-２-甲基丙磺酸为基础材料，对疏水单体、单体总浓度、引发剂、引发温度等合成条件进行了优化。研究表明，当单体总浓度为24% ，疏水单体选用浓度为0. 3% 的丙烯酰氧乙基二甲基长链烷基铵，引发剂选用浓度为 0. 16% 的过硫酸铵+亚硫酸氢钠 + 偶氮二异丁基脒盐酸盐,引发温度为 30 ℃ 时，合成的聚合物减阻剂性能最佳。合成的聚合物减阻剂与常规的聚合物压裂液相比，具有更好的耐盐性，更高的降阻率，更好的携砂性，且对储层的损害率较低。该压裂液在庆阳气田施工５口井，产量显著提高，取得了较好的应用效果。

关键词: 致密砂岩气, 聚合物减阻剂, 体积压裂, 耐盐性, 降阻率, 携砂性, 损害性能

Abstract:

The reservoir of Shan 1 member of Shanxi Formation in Qingyang ( QY) gas field of Changqing oilfield belongs to a typical ultra - low porosity and ultra - low permeability tight sandstone reservoir. Good stimulation effect has not been achieved with the conventional horizontal well staged fracturing technology. In order to improve the stimulation effect of lowpermeability tight sandstone reservoir, a polymer drag reducer P-FMA with good salt resistance and drag reduction performance is developed to meet the construction requirements of volume fracturing of tight sandstone reservoir. The drag reducer is based on acrylic acid ( AA) , acrylamide ( AM) and 2-acrylamide-2-methylpropanesulfonic acid ( AMPS) . The synthesis conditions of hydrophobic monomer, total monomer concentration, initiator and initiation temperature were optimized in this paper. The results show that the P-FMA polymer drag reducer has the best performance when the total concentration of monomer is 24% , the concentration of hydrophobic monomer is 0. 3% , the concentration of initiator is 0. 16% ammonium per-sulfate + sodium bisulfite + azodiisobutylamine hydrochloride ( AIBA) , and the initiation temperature is 30 ℃ . Compared with conventional polymer fracturing fluid, P-FMA polymer has better salt resistance, higher resistance reduction rate, better sand carrying capacity and lower damage rate to reservoir. The fracturing fluid has been used in 5 wells in QY gas field, the production has been significantly improved, and good application results have been obtained.

Key words: tight sandstone reservoir, polymer drag reducer, volume fracturing, salt resistance, resistance reduction rate, sand carrying capacity, damage performance

成育红, 李鑫, 曹朋亮, 张林, 邓宝康. 深层致密砂岩储层聚合物减阻剂的研究及应用[J]. 钻采工艺, 2022, 45(5): 134-138.

CHENG Yuhong , LI Xin , CAO Pengliang , ZHANG Lin , DENG Baokang. Research and Application of Polymer Drag Reducer in Deep Tight Sandstone Reservoir[J]. Drilling & Production Technology, 2022, 45(5): 134-138.

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