高压注烃类气体过程中沥青质初始沉淀压力试验研究  

A Study of Asphaltene Onset Pressure during High-Pressure Gas Injection

作　　者：钱坤[1] 杨胜来[1] 董俊昌[2] 刘辉[2] 刘盼[1] 

机构地区：[1]石油工程教育部重点实验室(中国石油大学(北京)),北京102249 [2]中国石油勘探开发研究院,北京100083

出　　处：《石油钻探技术》2015年第2期116-119,共4页Petroleum Drilling Techniques

摘　　要：为预防注烃类气体提高采收率过程中产生沥青质沉淀，对沥青质初始沉淀压力进行了试验研究。在分析注烃类气体过程中沥青质沉淀机理的基础上，通过自主研发的固相沉积激光探测装置，采用透光强度法测定了原油样品在不同温度下高压注气过程中沥青质的初始沉淀压力，并确定了沥青质沉淀的深度。试验得出，原油沥青质初始沉淀压力随温度升高而下降，测得44，80和123℃温度下原油的沥青质初始沉淀压力分别为44.1，39.7和35.2 M Pa；每注入物质的量分数为1％的烃类气体，试验油样的沥青质初始沉淀压力升高0.5～0.6 M Pa；井筒温度压力曲线与沥青质沉淀相包络线相结合预测井筒中出现沥青质沉淀的深度在1800 m左右，与现场情况吻合较好。研究表明，原油中沥青质初始沉淀压力与注气量之间呈线性关系，可为现场注气驱油预防和清除沥青质沉积物提供理论依据。In order to avoid asphaltene precipitation caused by gas injection for enhance d oil recovery , the asphaltene onset pressure （AOP） was tested in the laboratory .On the basis of the analysis of the as‐phaltene precipitation mechanism during gas injection ,the asphaltene onset pressures under different tem‐peratures were measured along with crude oil samples in the process of high‐pressure gas injection ,by using the self‐developed laser solid detection system and the light transmission method ,so as to determine the depth of asphaltene precipitation .T he results demonstrated that the asphaltene onset pressure decreases with the increase of temperature ,AOP are 44.1 MPa ,39.7 MPa and 35.2 MPa at the temperatures of 44 ℃ , 80 ℃ and 123 ℃ respectively in the experiment ;the asphaltene onset pressure increases 0.5 0.6 MPa w hen a‐mount of substance fraction 1% of hydrocarbon gas is injected .According to the asphaltene deposition en‐velope and wellbore temperature‐pressure curve ,it is predicted that asphaltene precipitates at a depth of 1 800 m ,which matched the field conditions very well .The study suggested that there is a linear correlation between the volume of gas injection and the asphaltene onset pressure ,which could provide a theoretical basis for preventing and removing asphaltene precipitate in gas injection on site .

关 键 词：注气 沥青质 透光强度法 初始沉淀压力 实验室试验 

分 类 号：TE357.44[石油与天然气工程—油气田开发工程]