玛湖凹陷致密砾岩油藏CO2异步吞吐提高采收率

doi:10.7657/XJPG20220211

摘要/Abstract

摘要：

CO₂具有增能和降黏的特性,CO₂异步吞吐是提高致密油藏采收率的有效途径之一,通过注气井组“注—采—焖”相互配合,可提高井间储量动用程度,有望成为准噶尔盆地玛湖凹陷致密砾岩油藏提高采收率的接替技术。综合考虑地层压力、饱和压力及最小混相压力,设计双岩心并联的CO₂异步吞吐实验,以明确储集层物性、注采压差和吞吐时机对开发效果的影响。结果表明,经CO₂异步吞吐开发后的原油采收率约为衰竭式开发的3~5倍,提升效果显著;储集层物性越好,渗流阻力越小,越有利于CO₂异步吞吐提高采收率;注采压差越大,井间压力振荡效果越显著,采出原油越多;注气压力大于混相压力时,有利于发挥CO₂超临界性质,提高采收率;在地层压力高于混相压力的前提下,CO₂异步吞吐时应尽量提高注气井压力并降低邻井压力,增大注采系统压差,从而扩大波及体积,提高井间储量动用程度。

关键词: 准噶尔盆地, 玛湖凹陷, CO₂异步吞吐, 提高采收率, 储集层物性, 注采压差, 吞吐时机, 混相压力

Abstract:

CO₂ can increase formation energy and reduce oil viscosity. Asynchronous CO₂ huff and puff is becoming one of the effective methods for improving the recovery of tight oil reservoirs. The interaction among injection, production and soaking processes can significantly increase inter-well reserves producing degree, and this technology is expected to become an option for enhancing the oil recovery of the Mahu tight conglomerate reservoirs in the Junggar basin. According to the formation pressure, saturation pressure and minimum miscible pressure, an asynchronous CO₂ huff and puff experiment with two cores in parallel was designed for clarifying the influence of reservoir physical properties, injection-production pressure difference and huff-puff timing on development effect. The results show that the crude oil recovery after asynchronous CO₂ huff and puff is about 3-5 times higher than that of the depletion development; the better the physical properties of the reservoir, the smaller the flow resistance, and the more favorable for asynchronous CO₂ huff and puff to improve oil recovery; the greater the injection-production pressure difference, the more significant the inter-well pressure change, and the more crude oil is produced; when the gas injection pressure is greater than the miscible pressure, it is beneficial for supercritical CO₂ to play the role and to improve the recovery; when the formation pressure is higher than the miscible pressure, it is necessary to increase the pressure of the gas injection well and reduce the pressure of the adjacent production well through asynchronous CO₂ huff and puff to increase the pressure difference of the injection-production system, expand the swept volume, and improve the inter-well reserves producing degree.

Key words: Junggar basin, Mahu sag, asynchronous CO₂ huff and puff, EOR, reservoir physical property, injection-production pressure difference, huff-puff timing, miscible pressure

中图分类号:

TE357

邓振龙, 王鑫, 谭龙, 张记刚, 陈超, 宋平. 玛湖凹陷致密砾岩油藏CO₂异步吞吐提高采收率[J]. 新疆石油地质, 2022, 43(2): 200-205.

DENG Zhenlong, WANG Xin, TAN Long, ZHANG Jigang, CHEN Chao, SONG Ping. Enhancing Oil Recovery of Tight Conglomerate Reservoirs by Asynchronous CO₂ Huff and Puff in Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(2): 200-205.

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玛湖凹陷致密砾岩油藏CO₂异步吞吐提高采收率

Enhancing Oil Recovery of Tight Conglomerate Reservoirs by Asynchronous CO₂ Huff and Puff in Mahu Sag

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