用于封堵新疆油田砾岩油藏水流优势通道的调剖剂研究

Sealing Dominant Water Channel of Conglomerate Reservoir in Xingjiang Oilfield by Profile Control Agent

唐 可 胡冰艳 廖元淇 罗 强 刘宝阳

TANG Ke HU Bingyan LIAO Yuanqi LUO Qiang LIU Baoyang

针对新疆油田七中东八道湾组砾岩油藏储层存在的严重非均质性问题， 为了有效封堵水流优势通道， 研制了以改性淀粉和丙烯酰胺为主剂的强冻胶调剖剂 LT-1， 考察了 LT-1的抗剪切性、 注入性和封堵性， 并在该油藏两井组进行了现场试验研究。结果表明， 由 2%～ 4%改性淀粉、 5%～ 6%丙烯酰胺、 0.01%～ 0.03%交联剂和 0.6%成胶控制剂组成的 LT-1 调剖剂在 30℃下的静态成胶时间约 8 h； 抗剪切性较好， 高速剪切后的强度保留率为95.5%； 在人造砾岩岩心中的注入性和封堵性能较好。矿场应用结果表明， LT-1可有效封堵水流优势通道， 水井吸水剖面明显改善， 注水压力上升， 对应油井见效明显， 两井组累计增油 1790 t， 适合砾岩油藏深部调剖堵水。图5表4参13

In view of the strong heterogeneity in Mid-East 7 Badaowan conglomerate reservoir of Xinjiang oilfield， a strong gel profile control agent called LT-1 which was mainly composed of modified starch and acrylamide was developed. The shearing resistance， injectivity and sealing property of LT-1 were investigated， and a pilot test in two wells located in the target reservoir was tested. The results showed that the optimum formula of LT-1 was obtained as follows：2% —4% modified starch， 5% —6% acrylamide monomer， 0.01%—0.03% crosslinking agent and 0.6% gelling agent. The static gelling time of LT-1 was about 8 hrs at 30℃. The strength retention of LT-1 was as high as 95.5% after high speed shearing. The injectivity and sealing property of LT-1 in artificially conglomerate core were good. Field application results showed that the injection profile of water well was dramatically improved， water injection pressure increased， and the corresponding oil well had significant effect with 1790 t cumulative oil increment of two well groups， which indicated that LT-1 could effectively block dominant water channel and had a good application prospect on deep profile control of conglomerate reservoir.

10.19346/j.cnki.1000-4092.2016.04.013