本文選題：魯2油藏 + 高礦化度　； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：1998年9月~2016年4月,魯2塊稠油油藏現(xiàn)有油井44口,水井11口。區(qū)塊累計產(chǎn)油65.64×10~4t,地下虧空66.59×10~4m~3,綜合含水高達84.93%,采出程度僅6.67%OOIP。注水開發(fā)過程中,魯2塊存水率逐漸下降,耗水率逐漸升高,含水率與采出程度關(guān)系曲線嚴重偏離理論曲線,注水開發(fā)效果差。為達到穩(wěn)油控水并大幅度提高油田最終采出程度的目的,需針對魯2塊稠油油藏特征尋求一種使其高產(chǎn)穩(wěn)產(chǎn)的三次采油技術(shù)。本文針對魯2油層特征開展了泡沫驅(qū)提高稠油采收率的試驗研究。首先在油層溫度及常壓條件下采用Waring-Blender法對36種工業(yè)起泡劑進行初篩選及泡沫體系性能評價;接著采用Waring-Blender法研究有效濃度、礦化度及壓力等因素對優(yōu)選發(fā)泡體系(XHY-6D,有效濃度0.10%)泡沫參數(shù)的影響及其在油砂上的靜態(tài)吸附量;然后通過單管巖心驅(qū)替試驗評價了有效濃度、氣液比、滲流線速度、滲透率、壓力及含油飽和度等因素對泡沫體系在孔隙介質(zhì)中封堵能力的影響,同時探討了流度比及有效黏度;最后通過雙管并聯(lián)巖心試驗評價了段塞大小及滲透率級差對泡沫驅(qū)油效果及驅(qū)油動態(tài)特征的影響。起泡劑性能評價結(jié)果表明,魯2油藏起泡劑XHY-6D適宜有效濃度0.10%,最低起泡有效濃度0.001%;泡沫體系具有良好的耐鹽性(礦化度由800mg/L增至174314mg/L,泡沫綜合指數(shù)由110.81×10~4mL·s下降至66.60×10~4mL·s,降幅僅39.9%。);壓力增大對泡沫體系參數(shù)具有增益作用;固液比1.0:1.0,礦化度86072mg/L,優(yōu)選發(fā)泡體系靜態(tài)吸附量為0.26mg/g。通過單管巖心驅(qū)替試驗確定了泡沫驅(qū)起泡劑XHY-6D適宜有效濃度0.10%、氣液比1.0:1.0及線速度1.0m/d;結(jié)果表明,滲透率193.0×10~(-3)μm~2,氣液比1.0:1.0,線速度1.0m/d,XHY-6D有效濃度0.10%、段塞0.3PV及溫度65℃條件下,泡沫阻力因子為66.3;隨著滲透率的增大,泡沫阻力因子先增大后降低,以滲透率1065.5×10~(-3)μm~2為分界點(此時阻力因子為121.3);在含油飽和度≤22%時,泡沫體系能有效生成泡沫且穩(wěn)定性好,具有較強的封堵能力;當(dāng)含油飽和度介于32%~60%區(qū)間時,雖然泡沫體系消泡很多,但阻力因子仍維持在20左右,仍具有一定的封堵能力;壓力增大對泡沫體系阻力因子具有增益作用。雙管驅(qū)油試驗結(jié)果表明,隨泡沫段塞的增大,雙管比水驅(qū)提高采收率逐漸增大,段塞大小為0.1PV、0.2PV、0.3PV及0.4PV時,雙管比水驅(qū)提高采收率分別為3.23%、7.26%、10.82%及12.35%;隨滲透率級差的增大,雙管比水驅(qū)提高采收率逐漸增大,滲透率級差為2.1、4.2、7.3及10.3時,雙管比水驅(qū)提高采收率分別為10.82%、13.52%、11.52%及10.29%。試驗最終確定適用于魯2塊高鹽稠油泡沫驅(qū)技術(shù)參數(shù)為:XHY-6D有效濃度0.10%,氣液比1.0:1.0,線速度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，

本文編號：1859867