TH油田X区注氮气提高采收率实验评价

发布时间：2018-01-02 02:05

本文关键词：TH油田X区注氮气提高采收率实验评价　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：TH油田X区块储层平均孔隙度12.4%,渗透率7.87mD,饱和压力下原油粘度1.3367mPa·s,是典型的低渗透稀油油藏。经过20多年的注水开发,目前已进入水驱开发中后期阶段,面临含水率高、产量递减快、注水压力过高、波及效率较低等问题,为了进一步提高原油采收率亟需开展注气可行性评价研究。本文以X区块实际储层岩心及流体样品,通过一系列室内物理模拟实验,分析油田注气的可行性及合理的注气开发方式,主要取得了以下结论与认识:(1)注气膨胀实验与固相沉积实验结果表明:注入N2和烃类气均能使原油膨胀、降低原油粘度、改善原油的物性参数增加其流动性;相比较于N2,烃类气降粘效果及溶解原油的能力较好;注入气主要抽提原油中的轻组分,导致原油密度越来越大,但注入两种气体后原油均不会产生固相沉积现象。(2)细管实验表明:实际测试N2在地层破裂压力条件下不能达到混相状态,烃类气混相压力为41.13MPa;在地层压力29MPa条件下,两种注入气体驱油效率分别为36.9%、66.86%,因此在X区块只能实现非混相驱的注气方式(3)不同注入气体长岩心实验表明:水驱后注气驱均能提高原油采收率;注C02提高幅度最大为23.36%,其次为注烟道气提高幅度为13.16%、烃类气提高幅度为8.76%、N2提高幅度为6.74%。(4)不同注入方式下气水交替驱长岩心实验表明:注N2及烃类气时,0.05HCPV段塞驱替效果最好、0.1HCPV提高采收率幅度次之、0.15HCPV效果最差;气水比为1:2时提高采收率幅度最大为16.71%、气水比1:1提高幅度为10.88%、气水比2:1提高幅度为 8.96%。
[Abstract]:TH X oil reservoir average porosity is 12.4%, the permeability of 7.87mD 1.3367mPa s, the viscosity of crude oil saturation pressure, is a typical low permeability oil reservoir. Water after 20 years of development, has entered the water flooding in the late stages of development, with high moisture content, rapid production decline, water injection pressure is too high, and the problem of efficiency low, in order to further improve the recovery rate of the urgent need to carry out research to evaluate the feasibility of gas injection in block X of crude oil. The actual reservoir core and fluid samples, through a series of physical simulation experiments, the feasibility analysis of oil gas injection and reasonable gas injection development way, has made the following main conclusions: (1) gas injection swelling experiment and solid deposition experiment results show that the injection of N2 and hydrocarbon gas can make oil swelling, reduce oil viscosity, improve the physical parameters of crude oil increases its liquidity; compared to the N2, viscosity reducing effect of hydrocarbon gas And the good ability to dissolve crude oil; gas extraction group injected light in crude oil, resulting in crude oil density increasing, but the two kinds of gas injection after crude oil will not have a solid deposition phenomenon. (2) experimental results show that the actual test tube in N2 formation fracture pressure under the condition of not miscible hydrocarbon gas mixed state. Pressure is 41.13MPa; the formation pressure under the condition of 29MPa, two kinds of gas injection displacement efficiency were 36.9%, 66.86%, so in the X block can only achieve non miscible gas injection method (3) different injection long core experiments show that gas: gas injection flooding after water flooding can enhance oil recovery injection; C02 increased the maximum rate of 23.36%, followed by injection of flue gas is increased by 13.16%, hydrocarbon gas is increased by 8.76%, N2 increased by 6.74%. (4) of different injection modes under water alternating gas flooding long core experiments show that injecting N2 and hydrocarbon gas, 0.05HCPV slug The best effect is 0.1HCPV, and the 0.15HCPV is the worst. When the ratio of gas to water is 1:2, the maximum recovery is 16.71%, the increase of 1:1 is 10.88%, and the ratio of gas to water is increased by 8.96%..

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.7

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