鲁2高盐稠油油藏泡沫驱提高采收率实验研究

发布时间：2018-05-08 04:05

  本文选题：鲁2油藏 + 高矿化度　； 参考：《成都理工大学》2017年硕士论文

【摘要】：1998年9月~2016年4月,鲁2块稠油油藏现有油井44口,水井11口。区块累计产油65.64×10~4t,地下亏空66.59×10~4m~3,综合含水高达84.93%,采出程度仅6.67%OOIP。注水开发过程中,鲁2块存水率逐渐下降,耗水率逐渐升高,含水率与采出程度关系曲线严重偏离理论曲线,注水开发效果差。为达到稳油控水并大幅度提高油田最终采出程度的目的,需针对鲁2块稠油油藏特征寻求一种使其高产稳产的三次采油技术。本文针对鲁2油层特征开展了泡沫驱提高稠油采收率的试验研究。首先在油层温度及常压条件下采用Waring-Blender法对36种工业起泡剂进行初筛选及泡沫体系性能评价;接着采用Waring-Blender法研究有效浓度、矿化度及压力等因素对优选发泡体系(XHY-6D,有效浓度0.10%)泡沫参数的影响及其在油砂上的静态吸附量;然后通过单管岩心驱替试验评价了有效浓度、气液比、渗流线速度、渗透率、压力及含油饱和度等因素对泡沫体系在孔隙介质中封堵能力的影响,同时探讨了流度比及有效黏度;最后通过双管并联岩心试验评价了段塞大小及渗透率级差对泡沫驱油效果及驱油动态特征的影响。起泡剂性能评价结果表明,鲁2油藏起泡剂XHY-6D适宜有效浓度0.10%,最低起泡有效浓度0.001%;泡沫体系具有良好的耐盐性(矿化度由800mg/L增至174314mg/L,泡沫综合指数由110.81×10~4mL·s下降至66.60×10~4mL·s,降幅仅39.9%。);压力增大对泡沫体系参数具有增益作用;固液比1.0:1.0,矿化度86072mg/L,优选发泡体系静态吸附量为0.26mg/g。通过单管岩心驱替试验确定了泡沫驱起泡剂XHY-6D适宜有效浓度0.10%、气液比1.0:1.0及线速度1.0m/d;结果表明,渗透率193.0×10~(-3)μm~2,气液比1.0:1.0,线速度1.0m/d,XHY-6D有效浓度0.10%、段塞0.3PV及温度65℃条件下,泡沫阻力因子为66.3;随着渗透率的增大,泡沫阻力因子先增大后降低,以渗透率1065.5×10~(-3)μm~2为分界点(此时阻力因子为121.3);在含油饱和度≤22%时,泡沫体系能有效生成泡沫且稳定性好,具有较强的封堵能力;当含油饱和度介于32%~60%区间时,虽然泡沫体系消泡很多,但阻力因子仍维持在20左右,仍具有一定的封堵能力;压力增大对泡沫体系阻力因子具有增益作用。双管驱油试验结果表明,随泡沫段塞的增大,双管比水驱提高采收率逐渐增大,段塞大小为0.1PV、0.2PV、0.3PV及0.4PV时,双管比水驱提高采收率分别为3.23%、7.26%、10.82%及12.35%;随渗透率级差的增大,双管比水驱提高采收率逐渐增大,渗透率级差为2.1、4.2、7.3及10.3时,双管比水驱提高采收率分别为10.82%、13.52%、11.52%及10.29%。试验最终确定适用于鲁2块高盐稠油泡沫驱技术参数为:XHY-6D有效浓度0.10%,气液比1.0:1.0,线速度1.0m/d,泡沫段塞0.3PV。
[Abstract]:From September 1998 to April 2016, there are 44 oil wells and 11 wells in Lu 2 block heavy oil reservoir. The cumulative oil production in the block is 65.64 脳 10 ~ (4) t, the underground deficit is 66.59 脳 10 ~ (4) m ~ (-1), the comprehensive water cut is as high as 84.93, and the recovery degree is only 6.67 OOIP. In the process of water injection development, the water storage rate of Lu 2 block decreases gradually, the water consumption rate increases gradually, the curve of relation between water cut and recovery degree deviates seriously from the theoretical curve, and the effect of water injection development is poor. In order to stabilize oil and control water and greatly improve the final recovery degree of oil field, it is necessary to seek a kind of tertiary oil recovery technology for high and stable production according to the characteristics of heavy oil reservoir in Lu 2 block. In this paper, an experimental study of foam flooding for enhancing recovery of heavy oil is carried out in accordance with the characteristics of Lu 2 reservoir. At first, 36 kinds of industrial foaming agents were screened by Waring-Blender method under the condition of reservoir temperature and atmospheric pressure, and the performance of foam system was evaluated by Waring-Blender method, and the effective concentration was studied by Waring-Blender method. The influence of salinity and pressure on the foam parameters of XHY-6D, effective concentration 0.10) and the static adsorption capacity on oil sand, the effective concentration, gas-liquid ratio, percolation line velocity and permeability are evaluated by single core displacement test. The influence of pressure and oil saturation on the plugging ability of foam system in porous media is discussed. The mobility ratio and effective viscosity are also discussed. Finally, the effects of slug size and permeability differential on the flooding effect and dynamic characteristics of foam flooding are evaluated by double-pipe parallel core test. The results of performance evaluation of foaming agent show that, The optimum effective concentration of foaming agent XHY-6D is 0.10 and the minimum effective concentration of foaming is 0.001.The foam system has good salt tolerance (salinity increases from 800mg/L to 174314mg / L, foam composite index decreases from 110.81 脳 10~4mL s to 66.60 脳 10~4mL s, the decrease is only 39.9%; pressure increases to foam system. The parameters have gain effect; The ratio of solid to liquid is 1.0: 1.0, the salinity is 86072 mg / L, and the static adsorption capacity of the selected foaming system is 0.26 mg / g. The optimum effective concentration of foam flooding agent XHY-6D was determined by single tube core flooding test, the ratio of gas to liquid was 1.0: 1.0, and the linear velocity was 1.0 m / d. The results showed that the permeability was 193.0 脳 10 ~ (-3) 渭 m ~ (-2), the ratio of gas to liquid was 1.0: 1.0, the effective concentration of linear velocity was 1.0 mg / r ~ (-1) XHY-6D, the slug 0.3PV and temperature were 65 鈩，

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