Abstract

M7 block of Santanghu oilfield is an abnormal low temperature tight oil reservoir. The effective development is very difficult. In this paper, we develop a new composite viscosity reducer called CSY-1. The synergistic effect of these agents provides the reducer with both dispersion and emulsification capacities. Based on orthogonal experiment and cost evaluation, the optimum formula of CSY-1 is 0.5% OP-10, 1.8% SDBS, 0.1% Tween 80, and 1% NaOH (or Na₂CO₃). The rheology property of heavy oil changed fundamentally before and after the addition of CSY-1. Oil-in-water emulsion with very low viscosity can be obtained and the viscosity reduction rate can be over 99%. Simulation results showed that the oil production of a single well can be increased from the current 3.74 t/d to 8.12 t/d with the application of this reducer.

中文翻译：

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高酸值异常低温超重油藏的新型复合降粘剂

摘要

三塘湖油田M7区块是一个异常的低温致密油藏。有效的发展是非常困难的。在本文中，我们开发了一种新型的复合降粘剂CSY-1。这些试剂的协同作用为还原剂提供了分散能力和乳化能力。根据正交试验和成本评估，CSY-1的最佳配方为0.5％OP-10、1.8％SDBS，0.1％Tween 80和1％NaOH（或Na ₂ CO _3））。添加CSY-1前后，重油的流变特性发生了根本变化。可以得到粘度非常低的水包油乳液，粘度降低率可以超过99％。模拟结果表明，使用该减压器可以将单井的采油量从目前的3.74吨/天提高到8.12吨/天。