摘要
以塔河油田井间单套缝洞型油藏为模型基础,设计了橡胶颗粒调流剂堵水物理模拟驱替实验,对水驱规律进行了分析,并探讨了不同的封堵位置、橡胶颗粒用量、粒径、密度以及注水速度对驱替效果的影响。研究结果表明:(1)模拟实验设置模型长度为40 cm,宽度为30 cm,厚度为5 cm,裂缝开度为4~20 mm,溶洞直径为2~4 cm,井筒宽度为10 mm,模型缝洞体积为175 mL,在温度为25℃、常压时,以10 mL/min的速度注水驱替至采油井含水率达到98%时的最终采出程度为43.83%;由于重力分异作用,注水驱替后存在大量的阁楼油和绕流油,阁楼油主要集中在横向顶部通道,绕流油主要集中在横向中部通道和横向底部通道的高位,油水界面与横向中部通道的高位缝齐平。(2)模拟实验中同时封堵横向底部通道和横向中部通道,橡胶颗粒采用混合粒径,颗粒密度和模拟地层水密度一致,用量越大,注水速度越大,调流效果越好;橡胶颗粒用量为0.04 PV,粒径小于1 mm和2~4 mm的颗粒各半,注水速度为15 mL/min时,采出程度提高了18.45%;同时注入水以及与水等密度的橡胶颗粒,可有效封堵优势通道,效果较好。(3)在TH25X井进行橡胶颗粒调剖堵水现场实验中,设置前置段塞橡胶颗粒粒径为2~4 mm,后置段塞橡胶颗粒粒径小于1 mm,颗粒密度为1.13 g/cm3,以50 m3/d的速度同时注入水和橡胶颗粒共920 m3,堵水后累计增油1 200 t,含水率下降15%,取得较好封堵效果。
Based on the model of a single-seam fractured-vuggy reservoir between wells in Tahe Oilfield,a physical simulation and displacement experiment of water plugging by rubber particle flow regulating agent was designed,the law of water flooding was analyzed,and the effects of different blocking locations,rubber particle dosage,particle size,density and injection rate on the displacement effect were discussed.The results show that:(1)The model length is 40 cm,the width is 30 cm,the thickness is 5 cm,the crack opening to is 4-20 mm,the cave diameter is 2-4 cm,the width of the wellbore is 10 mm,the crack volume of the model is 175 mL.At a temperature of 25℃and atmospheric pressure,and at a water injection rate of 10 mL/min,the final degree of recovery is 43.83%when the water content of the production well reaches 98%by water injection at the rate of 10 mL/min.Due to gravity differentiation,there is a large amount of attic oil and bypass oil after water flooding,attic oil is mainly concentrated in the transverse top channel,bypass oil is mainly concentrated in the high position of the transverse middle channel and the transverse bottom channel,and the oil-water interface is flush with the high seam of the transverse middle channel.(2)In the simulation experiment,the transverse bottom channel and the transverse middle channel were blocked at the same time.The rubber particles were mixed in particle size,and the particle density is consistent with the density of the simulated formation water.The larger the amount,the greater the injection rate,and the better the flow regulation effect.When the amount of rubber particles was 0.04 PV,the particle size was less than 1 mm and 2-4 mm,and the injection rate was 15 mL/min,the recovery rate increased by 18.45%.Rubber particles with the same density as formation water can be carried and transported to the desired blocking position by injecting water,and the water blocking effect is better.(3)In the field experiment of rubber particle profile control and water plugging in well TH25X,The rubber particle size of the front section plug is 2-4 mm,the rubber particle size of the rear section plug is less than 1 mm,and the particle density is 1.13 g/cm3.Water and rubber particles were injected simultaneously at the rate of 50 m3/d,and the total amount is 920 m3.After water plugging,the cumulative oil increase is 1200 t,and the water content decreases by 15%,achieving good plugging effect.
作者
钱真
毛志强
郑伟
黄远军
陈立峰
曾慧勇
李岗
宋嫒
QIAN Zhen;MAO Zhiqiang;ZHENG Wei;HUANG Yuanjun;CHEN Lifeng;ZENG Huiyong;LI Gang;SONG Ai(Research Institute of Petroleum Engineering and Technology,Sinopec Northwest Oilfield Company,Urumqi 830011,China;Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-Vuggy Reservoirs,Sinopec,Urumqi 830011,China;Key Laboratory of Drilling and Production Engineering for Oil and Gas,Hubei Province,Wuhan 430100,China;National Engineering Research Center for Oil&Gas Drilling and Completion Technology,Yangtze University,Wuhan 430100,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)
出处
《岩性油气藏》
CAS
CSCD
北大核心
2023年第4期161-168,共8页
Lithologic Reservoirs
基金
国家自然科学基金项目“热敏聚合物纳米流体高温触变机制研究”(编号:52074038)资助。
关键词
井间单套结构
缝洞型油藏
调剖堵水
物理模拟实验
水驱规律
橡胶颗粒
随机调流
塔河油田
inter-well single structure
fractured-vuggy reservoir
profile control and water plugging
physical simulation experiment
water flooding law
rubber particles
random flow regulation
Tahe Oilfield
