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摘要? 致密變形介質(zhì)油藏水驅(qū)滲流過程中會(huì)產(chǎn)生部分或全部不可逆形變,，地層滲透率,、孔隙度會(huì)發(fā)生不同程度降低,，水驅(qū)滲流阻力大，難以形成有效的驅(qū)動(dòng)壓力系統(tǒng),，原油難以得到很好的動(dòng)用,，采收率低。以水驅(qū)油滲流模型入手,，以介質(zhì)變形理論為依托,，利用疊加原理推導(dǎo)了考慮介質(zhì)變形五點(diǎn)面積井網(wǎng)勢(shì)函數(shù)、壓力函數(shù),、流函數(shù)和平面速度函數(shù)解析公式,，根據(jù)流函數(shù)得到井網(wǎng)流線。結(jié)合物質(zhì)平衡理論,，通過對(duì)平面速度函數(shù)積分得到無因次井網(wǎng)單元見水時(shí)間,。基于不變流線假設(shè),，通過特征線方法求解水驅(qū)油滲流方程組得到平面等飽和度線運(yùn)動(dòng)方程,。研究結(jié)果表明，介質(zhì)變形系數(shù)對(duì)儲(chǔ)層有效動(dòng)用程度有重大影響,，介質(zhì)變形造成面積井網(wǎng)動(dòng)用程度降低,，介質(zhì)變形系數(shù)越大，儲(chǔ)層有效動(dòng)用程度越低,，采出程度越低,。

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關(guān)鍵詞 ：致密油藏,；變形介質(zhì)；有效動(dòng)用系數(shù),；介質(zhì)變形系數(shù),；五點(diǎn)面積井網(wǎng)

Abstract：

A partial or complete irreversible deformation is generated in the development process of tight deformed reservoirs. Formation permeability and porosity will decrease with various degrees, the resistance to water flooding is large, and it is difficult to form an effective driving pressure system to exploit and develop the crude oil. As the result, the degree of the effective development is low. This paper takes full account of the characteristics of non-linear oil-water two-phase seepage in a low permeability reservoir. Deformed porous media, potential function, pressure function, stream function and velocity function analytical formulations are presented by considering of the influence of stress sensitivity through the superposition principle. According to the material balance theory, the breakthrough time of the dimensionless well pattern unit is derived through the integral of the velocity function. Moreover, according to the constant streamline hypothesis, a motion equation of the isosaturation surface is derived with a characteristic line method. The results show that by this new method, the stress sensitive coefficient has a significant impact on the effective development coefficient. The larger the media deformation factor is, the lower are the effective
development coefficient and the oil recovery.

Key words： tight; deformed medium; effective development coefficient; media deformation factor; five-spot well pattern

收稿日期: 2019-06-28 ????

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基金資助:國家科技重大專項(xiàng) ( 編號(hào)2016ZX05037-003, 2017ZX05049-003) 基金資助

通訊作者: [email protected]

引用本文: ??

曹耐, 董平川, 雷剛. 致密變形介質(zhì)油藏五點(diǎn)面積井網(wǎng)水驅(qū)動(dòng)態(tài)分析. 石油科學(xué)通報(bào), 2019, 02: 165-173

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CAO Nai, DONG Pingchuan, LEI Gang. Analysis of water flooding behavior in a five-spot well pattern in tight deformed reservoirs. Petroleum Science Bulletin, 2019, 02: 165-173.

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