Effect analysis of chemical paraffin removal and control technology in Ansai Oilfield

doi:10.16085/j.issn.1000-6613.2019-1890

Abstract

Abstract:

During the production of waxy crude oil, the phenomenon of paraffin deposition is common in oil well. Effective paraffin removal and control technology is an important factor to ensure stable production of oil wells, and the application effects of chemical paraffin removal and control technology are affected by sinking degree, fluid production , water content, etc. Thus it is difficult to evaluate the field application effects of chemical process under complex conditions in oil well. In order to study the application effect of paraffin removal and control technology, based on its principle, the high waxy crude oil and sediment before and after the application of paraffin removal and control technology in Ansai Oilfield were taken as the study object, and the composition of crude oil group, paraffin composition, wax content, wax appearance temperature (WAT), viscosity and paraffin dissolution rate were analyzed. Four evaluation indexes were determined through comparison, a multi-objective evaluation method was introduced, and evaluation system of wax removal and control technology was established. The results showed that after the application of paraffin removal and control technology, the viscosity of crude oil was reduced; the percentage content of C₁₆—C₃₀ decreased and the percentage above C₃₀ increased; the average change rate of wax content in crude oil was 22.99%; the average change rate of WAT of crude oil was 2.86%; the paraffin dissolving rate of each paraffin remover and inhibitor was greater than 0.0160g/min; the comprehensive scores of CQ-11 and CQ-3 processes were high, and effects of field application were good. The calculation results are in accordance with the direction of the application of chemical paraffin removal and control technology in Ansai Oilfield, so it has a strong reference.

Key words: high waxy crude oil, paraffin remover and inhibitor, evaluating indicator, comprehensive evaluation

摘要：

含蜡原油开采过程中，油井普遍存在结蜡现象。行之有效的清防蜡工艺是保障油井稳产的重要因素，化学清防蜡工艺应用效果受沉没度、产液量及含水率等的影响，在油井复杂条件下，其现场应用效果难以评价。为研究清防蜡工艺的应用效果，本文基于清防蜡工艺原理，以安塞油田清防蜡工艺应用前后的高含蜡原油和沉积物为研究对象，分析了原油族组成、蜡组成、蜡含量、析蜡点、黏度和溶蜡速率；通过比较确定了4个评价指标，引入多目标评价方法，建立了清防蜡工艺效果评价体系。研究表明清防蜡工艺应用后原油黏度降低；蜡的碳数C₁₆~C₃₀的百分含量降低，C₃₀以上的百分含量升高；原油平均蜡含量变化率为22.99%；原油平均析蜡点变化率为2.86%；各清防蜡剂溶蜡速率均大于0.0160g/min；CQ-1工艺和CQ-2工艺的综合得分较高，现场应用效果良好。计算结果与安塞油田应用化学清防蜡工艺的方向一致，具有较强的参考性。

关键词: 高含蜡原油, 清防蜡剂, 评价指标, 综合分析

CLC Number:

TE832

Nanjun LAI, Jun LI, Yiming LYU, Zhongrong LIU, Min LI, Dongyu QIAO, Jiawen DENG. Effect analysis of chemical paraffin removal and control technology in Ansai Oilfield[J]. Chemical Industry and Engineering Progress, 2020, 39(10): 4164-4174.

赖南君, 李俊, 吕亿明, 刘中嵘, 李敏, 乔东宇, 邓嘉雯. 安塞油田化学清防蜡工艺效果分析[J]. 化工进展, 2020, 39(10): 4164-4174.

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