Variation of crude oil properties with multi-cycle CO<sub>2</sub> huff-n-puff of horizontal wells in ultra-low permeability reservoir

LIAO Songlin; XIA Yang; CUI Yinan; LIU Fangzhi; CAO Shengjiang; TANG Yong

doi:10.13809/j.cnki.cn32-1825/te.2022.05.010

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Variation of crude oil properties with multi-cycle CO₂ huff-n-puff of horizontal wells in ultra-low permeability reservoir
Issue 5, Pages: 784-793(2022)
Published：2022
DOI： 10.13809/j.cnki.cn32-1825/te.2022.05.010
稿件说明：

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DOI：

LIAO Songlin, XIA Yang, CUI Yinan, et al. Variation of crude oil properties with multi-cycle CO₂ huff-n-puff of horizontal wells in ultra-low permeability reservoir[J]. Petroleum Reservoir Evaluation and Development, 2022, (5): 784-793. DOI： 10.13809/j.cnki.cn32-1825/te.2022.05.010.

摘要

水平井压裂后注CO

吞吐技术能有效改善原油性质

提高超低渗油藏采收率。结合典型超低渗透储层油藏H区地质及流体特征

采用室内实验和数值模拟相结合的手段

开展超低渗油藏水平井注CO

多周期吞吐机理及原油性质变化规律的研究。结果表明:注入CO

使得原油饱和压力升高、体积膨胀、黏度降低、体系变轻质;注CO

吞吐不同阶段的主要作用机理不同

注入阶段补充地层能量、溶于原油、降低原油黏度

焖井及开井生产初期降低原油黏度

扩大CO

波及范围

开井生产中后期萃取轻质烃和少量中间组分烃;采用定时定点的方式

分析油藏中不同距离的油相中CO

含量

推测出H区块注入CO

沿裂缝的横向波及半径介于24～40 m

随着吞吐周期的增多

油相中CO

摩尔含量的增幅由第一周期的增加451倍

降到第三吞吐周期的0.44倍

注入的CO

溶于原油的量相对减小

对原油性质的影响逐渐减小。该研究对CO

吞吐机理的认识提供了新的分析方式

为进一步推广超低渗油藏水平井CO

多周期吞吐技术提供一定的理论支撑。

Abstract

huff-n-puff after fracturing of horizontal wells can effectively improve the properties of crude oil and increase the oil recovery of ultra-low permeability reservoirs. Combined with the geology and fluid characteristics of a typical ultra-low permeability reservoir

Block H

the mechanism of multi-cycle CO

injection in horizontal wells and the variat

ion of crude oil properties in ultra-low permeability reservoirs are studied by means of laboratory experiment and numerical simulation. The results show that after CO

injection

the saturated pressure of crude oil increases

the volume expands

the viscosity decreases

and the system becomes lighter. And the main action mechanism of different stages of CO

huff-n-puff are different: in the injection stage

the main mechanism is to supplement the formation energy

dissolve in crude oil

and reduce the crude oil viscosity; in the soaking and the initial stage of production

the main mechanism is to reduce the crude oil viscosity and expand the scope of CO

; in the middle and late period of well opening production

the light hydrocarbons and a small amount of intermediate component hydrocarbons in the oil phase are extracted. The CO

content in oil phases at different distances in the reservoir is analyzed by the method of fixed time and fixed point

and it is deduced that the lateral sweep radius of CO

injection along the fracture in H block is 24~40 m. With the increase of the huff-n-puff cycle

the increase of molar content of CO

in the oil phase decreased from 451 times in the first cycle to 0.44 times in the third cycle. The dissolved amount of injected CO

in crude oil decreases relatively

and the effect on the properties of crude oil also gradually decreases. The above research provides a new analysis method for understanding the mechanism of CO

huff-n-puff

and provides some theoretical support for further popularizing the multi-cycle CO

huff-n-puff technology of horizontal wells in ultra-low permeability reservoirs.

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Variation of crude oil properties with multi-cycle CO2 huff-n-puff of horizontal wells in ultra-low permeability reservoir

DOI： 10.13809/j.cnki.cn32-1825/te.2022.05.010

摘要

Abstract

关键词

Keywords

references

Variation of crude oil properties with multi-cycle CO₂ huff-n-puff of horizontal wells in ultra-low permeability reservoir