热烃协同作用下新疆浅层稠油拟启动压力梯度模型

doi:10.7657/XJPG20260108

摘要/Abstract

摘要：

新疆油田J230区块高温蒸汽吞吐开发造成地层剩余稠油黏度升高，启动压力差异大，流体窜流严重，轻烃溶剂的加入可有效降低稠油拟启动压力梯度。通过黏温和流变测试，对比加入轻烃溶剂前后稠油的黏温曲线和流变性能，通过流动实验，确定稠油流度和拟启动压力梯度间的关系，建立溶剂辅助蒸汽开发的拟启动压力梯度模型。研究表明：轻烃溶剂降黏和热降黏协同效应可提升降黏效应；轻烃溶剂可改善稠油流动能力，在40 ℃下加入质量分数为5.0%的轻烃溶剂时，稠油的拟启动压力梯度与稠油在70 ℃时的拟启动压力梯度相当；烃类加入后可减少稠油的不可动用量，拟启动压力梯度图版显示加入轻烃溶剂质量分数为0.5%、2.0%和5.0%时，不可动用量减少了39.13%、70.56%和87.14%，降黏剂的加入能够减少蒸汽用量，有效降低稠油的拟启动压力，抑制窜流现象的发生。

关键词: 稠油, 溶剂辅助蒸汽驱, 拟启动压力梯度, 热烃协同作用, 流变性, 轻烃溶剂

Abstract:

The high-temperature steam huff-and-puff in the J230 block of Xinjiang oilfield has led to an increased viscosity in residual heavy oil in the formation, significant differences in threshold pressure, and severe fluid channeling. Adding light hydrocarbon solvent can effectively reduce heavy oil threshold pressure gradient. In this paper, viscosity-temperature and rheological tests were conducted to compare the viscosity-temperature curves and rheological properties of heavy oil before and after the addition of light hydrocarbon solvent, and flow experiments were performed to clarify the relationship between the mobility of heavy oil and the pseudo threshold pressure gradient. Finally, a pseudo threshold pressure gradient model for solvent-assisted steam flooding was established. The study shows that the synergy between viscosity reduction by heat and viscosity reduction by light hydrocarbon solvent （or heat-hydrocarbon synergy in brief） allows for an improved performance. Light hydrocarbon solvent can modify the flow capacity of heavy oil. Adding 5%（mass fraction） light hydrocarbon solvent at 40℃ yields a pseudo threshold pressure gradient of heavy oil comparable to that at 70℃. Addition of light hydrocarbon solvent can reduce the quantity of immovable heavy oil. As shown in the pseudo threshold pressure gradient diagram, when the mass fraction of light hydrocarbon solvent added is 0.5%, 2.0%, and 5.0%, the quantity of immovable heavy oil is reduced by 39.13%, 70.56%, and 87.14%, respectively. Addition of the light hydrocarbon solvent can reduce steam consumption, thereby effectively lowering the pseudo threshold pressure of heavy oil, and thus suppressing fluid channeling.

Key words: heavy oil, solvent-assisted steam flooding, pseudo threshold pressure gradient, heat-hydrocarbon synergy, rheological property, light hydrocarbon solvent

中图分类号:

TE348

李启航, 颜永何, 木合塔尔, 王志章, 李宜强, 陈文浩, 袁朝野. 热烃协同作用下新疆浅层稠油拟启动压力梯度模型[J]. 新疆石油地质, 2026, 47(1): 74-80.

LI Qihang, YAN Yonghe, Muhetar , WANG Zhizhang, LI Yiqiang, CHEN Wenhao, YUAN Chaoye. Pseudo Threshold Pressure Gradient Model for Shallow Heavy Oil Reservoirs in Xinjiang Oilfield Under the Heat-Hydrocarbon Synergy[J]. Xinjiang Petroleum Geology, 2026, 47(1): 74-80.

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区块	阳离子含量			阴离子含量				总矿化度
区块	K⁺+Na⁺	Mg²⁺	Ca²⁺	Cl^-	SO2+4	HCO- 3	CO2-3	总矿化度
J230区块	3 425.32	43.52	106.91	1 783.34	237.47	1 791.80	101.63	7 489.99