聚驱后聚表剂“调驱堵压”调整技术研究

doi:10.11885/j.issn.16745086.2020.01.15.02

摘要/Abstract

摘要： 针对大庆油田主力油层在聚合物驱后仍有43.7%储量残留的问题，开展了聚合物驱后聚表剂“调驱堵压”调整技术研究，采用了室内物理模拟、油藏数值模拟和现场试验动态分析结合的方式，提出并论证了“调驱堵压”技术及其可行性。研究结果表明，“调”首先是井网调整，通过井网适当加密达到调整渗流方向、挖潜分流线剩余油、提高驱替压力梯度的目的；其次是调整剖面，尽早实施机械分层，采用分步注入方式缓解层间矛盾。注0.3 PV调驱型聚表剂（浓度2 000 mg/L），利用其缔合发挥动态增黏作用缓解层内矛盾。“驱”是转注0.7 PV驱洗型聚表剂（浓度1 000 mg/L），利用梯次降黏提速的注入方式并根据开发动态进行适当调整。“堵”是通过驱洗型聚表剂发挥乳化作用，形成乳化油型封堵。“压”是指适度规模压裂，释放乳化型剩余油及压开厚油层顶部释放侧积夹层遮挡型剩余油，达到引效目的。现场试验表明，该技术聚合物驱后提高采收率9%以上，经济效益良好，有望成为聚合物驱后提高采收率技术的新途径。

关键词: 大庆油田, 聚合物驱后, 聚表剂, 调驱堵压, 提高采收率

Abstract: In view of the problem that 43.7% reserves remain underground after polymer flooding in the main oil layer of Daqing Oilfield, the adjustment technology of "Adjustment + Displacement + Water Plugging + Fracturing" using polymer-surfactant agent after polymer flooding is studied. By the means of laboratory physical simulation, reservoir numerical simulation and dynamic analysis of field test, the technology of "Adjustment + Displacement + Water Plugging + Fracturing" and its feasibility are put forward and demonstrated. "Adjustment" is first of all the well pattern adjustment for the purpose of adjusting the seepage direction, exploiting the residual oil in the diverging line and increasing the displacement pressure gradient. The second step of "Adjustment" is "Profile Control" in which seperated layer injection is implemented as soon as possible, and conflicts between layers is alleviated by stepwise injection. The 0.3 PV polymer-surfactant agent type I (concentration:2 000 mg/L) is injected, and its association is used to play a dynamic viscosity increasing role to alleviate in-layer contradictions. "Displacement" is using 0.7 PV polymer-surfactant agent type II (concentration:1 000 mg/L), which is injected with step-down viscosity and increased rate, and is adjusted accordingly to development dynamics. "Water Plugging" is forming emulsified oil type plugging, by using the polymer-surfactant agent type II. "Fracturing" is moderate fracturing, that releases the emulsified remaining oil, side interlining barrier remaining oil on top reservoir and thin layer emulsified residual oil. The field test shows that the EOR is more than 9% with good economic benefits. It is expected to be a new way of EOR technology after polymer flooding.

Key words: Daqing Oilfield, after polymer flooding, polymer-surfactant agent, adjustment+displacement+water plugging+ fracturing, enhanced oil recovery

中图分类号:

TE357

何金钢, 袁琳. 聚驱后聚表剂“调驱堵压”调整技术研究[J]. 西南石油大学学报(自然科学版), 2021, 43(3): 165-174.

HE Jingang, YUAN Lin. The Technology of “Adjustment + Displacement + Water Plugging + Fracturing” Using Polymer-surfactant Agent After Polymer Flooding[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(3): 165-174.

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