高压条件下含气高凝油析蜡特征

doi:10.7623/syxb201912010

石油学报 ›› 2019, Vol. 40 ›› Issue (12): 1511-1518.DOI: 10.7623/syxb201912010

高压条件下含气高凝油析蜡特征

王敉邦^1,2, 杨胜来^1,2, 郑祖号^1,2, 温静³, 王鸿博⁴, 钱坤^1,2

1. 油气资源与探测国家重点实验室北京 102249;
2. 中国石油大学石油工程教育部重点实验室北京 102249;
3. 中国石油辽河油田公司勘探开发研究院辽宁盘锦 124010;
4. 中国石油管道局工程有限公司河北廊坊 065000

收稿日期:2018-12-05 修回日期:2019-06-04 出版日期:2019-12-25 发布日期:2020-01-04
通讯作者: 杨胜来,男,1961年10月生,1982年获太原理工大学学士学位,1996年获中国矿业大学博士学位,现为中国石油大学(北京)石油工程学院教授,主要从事油气田开发工程方向研究工作。Email:yangsl@cup.edu.cn
作者简介:王敉邦,男,1991年7月生,2014年获中国石油大学(北京)学士学位,现为中国石油大学(北京)博士研究生,主要从事油藏渗流机理及数值模拟研究工作。Email:zgsydxwmb@163.com
基金资助:
国家科技重大专项（2016ZX05016-006-003）和中国石油天然气股份有限公司重大科技专项"辽河油田千万吨稳产关键技术研究与应用"（2017E-16）资助。

Wax precipitation characteristics of high pour-point live oil under high pressure

Wang Mibang^1,2, Yang Shenglai^1,2, Zheng Zuhao^1,2, Wen Jing³, Wang Hongbo⁴, Qian Kun^1,2

1. State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;
2. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
3. Research Institute of Exploration and Development, PetroChina Liaohe Oilfield Company, Liaoning Panjin 124010, China;
4. China Petroleum Pipeline Engineering Co., Ltd., Hebei Langfang 065000, China

Received:2018-12-05 Revised:2019-06-04 Online:2019-12-25 Published:2020-01-04

摘要/Abstract

摘要：

目前脱气含蜡油研究成果对析蜡带来的影响认识不够清楚，在油藏开发或管道加气输送设计中过于保守；在高压条件下析蜡特征研究也存在测试手段单一、测试压力低以及测试温差间距大的不足。基于前人研究成果，提出了一种基于激光法的含气高含蜡原油析蜡特征预测新方法，该方法采用激光法获得含气原油与脱气原油激光衰减测试曲线，基于Beer-Lambert定律将不同条件下激光衰减曲线的标度进行统一，然后在脱气原油研究成果的基础上实现对高压含气条件下析蜡特征的研究与分析；同时设计了一套高压取样装置验证了预测结果的可靠性。实验结果表明：激光法测试结果准确度高；溶解气的存在能有效降低高含蜡原油析蜡点、凝固点，地层条件比地面条件下平均析蜡速率下降19%；饱和压力之上，随着压力下降，析蜡点在12~18 MPa区间降幅较大，凝固点在15 MPa以下近乎不变，蜡晶颗粒平均等积圆直径和宽度系数在波动中分别呈上升和下降趋势；压力低于15.8 MPa后沥青质以分散态的形式析出并影响原油析蜡特征，在抑制蜡晶析出的同时加速原油胶凝过程。

关键词: 高凝油, 高压含气, 析蜡特征, 激光法, 沥青质影响

Abstract:

At present, the achievements in research of dead waxy oil always exaggerates the impact of wax precipitation, and the design for reservoir development or gas pipeline transportation is too conservative. However, under high pressure, the research of wax precipitation characteristics is faced with such shortcomings as single test method, low test pressure and large test temperature difference. This paper proposes a new method for predicting the wax precipitation characteristics of live oil with high wax content based on laser method. Firstly, with the use of laser, this method obtained the power of the laser transmitted though the fluid curve of live oil and dead oil; secondly, based on Beer-Lambert law under different conditions, the scale of laser power attenuation curve was unified; finally, based on the research results of dead oil, the wax characteristics under high pressure and dissolve-gas conditions were studied and analyzed, while a set of high-pressure sampling device was designed to verify the reliability of the prediction results. The experiment shows the test results obtained by the laser method are highly accurate; the dissolved gas can effectively reduce the wax precipitation point temperature and freezing point temperature of high wax content crude oil; the average wax precipitation rate under reservoir conditions is reduced by 19% as compared with ground condition. When the pressure is above the saturation pressure, the decreasing range of wax precipitation point is the largest when the pressure is in the range of 12-18 MPa, while the freezing point is almost unchanged when the pressure is below 15 MPa. The average diameter and width coefficient of equal area circle of wax crystal particles respectively tend to rise and decline in fluctuation. When the pressure is lower than 15.8 MPa, the asphaltene will precipitate in a dispersed state, affect the wax precipitation characteristics of crude oil, and can accelerate the gelation process of crude oil while inhibiting the precipitation of wax crystals.

Key words: high pour-point oil, dissolved-gas under high pressure, wax precipitation characteristics, laser method, asphaltene effect

中图分类号:

TE135

王敉邦, 杨胜来, 郑祖号, 温静, 王鸿博, 钱坤. 高压条件下含气高凝油析蜡特征[J]. 石油学报, 2019, 40(12): 1511-1518.

Wang Mibang, Yang Shenglai, Zheng Zuhao, Wen Jing, Wang Hongbo, Qian Kun. Wax precipitation characteristics of high pour-point live oil under high pressure[J]. Acta Petrolei Sinica, 2019, 40(12): 1511-1518.

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高压条件下含气高凝油析蜡特征

Wax precipitation characteristics of high pour-point live oil under high pressure

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