耐温抗盐型复合调剖体系的研究

发布时间：2018-01-13 04:26

本文关键词：耐温抗盐型复合调剖体系的研究　出处：《长江大学》2015年硕士论文　论文类型：学位论文

【摘要】：姬塬油田耿83区块为低孔、低渗,且裂缝较为发育的油藏,从油层开发动态来看,裂缝主向油井见水快,且见水后含水迅速上升直至水淹,侧向油井见效程度小,产能较低。为提高注水开发效率,增加注入水波及面积,实现油田降水增油的目标,结合耿83区块的地质特征和地层水矿化度高的特征,开展了耐温抗盐型复合调剖体系的室内研究,本文选择了强度高的预交联凝胶颗粒和成胶时间可调、注入性好的弱凝胶作为复合调剖体系,并分别对预交联凝胶颗粒和弱凝胶进行了配方优化和性能评价,以提高它们的耐温抗盐性。预交联凝胶颗粒为单体在引发剂、交联剂等试剂的作用下通过水溶液聚合法聚合而成的产物,本文研究了各组分用量对预交联凝胶颗粒吸水性能的影响,筛选得出预交联凝胶颗粒的最优配方,引发剂：0.04%,交联剂：0.04%,增韧剂：10.0%,丙烯酸：2.5%,单体总量：30.0%,中和度：20%。在室内对最优配方下的预交联凝胶颗粒进行了性能评价,预交联凝胶颗粒在清水和模拟地层水(矿化度16×104mg/L)中分别可膨胀100倍和15.8倍左右,油藏条件下放置120天,保水性在80%以上。通过填砂管物模实验测得,凝胶颗粒的封堵率高达99%,持续注入30PV模拟地层水冲刷,封堵率仍保持在91%左右。弱凝胶是由低浓度的聚合物在交联剂的作用下交联而成的具有一定流动能力和黏度的胶体。本文设计正交水平实验,对弱凝胶体系的各组分展开研究,筛选出弱凝胶的最佳配方为：HPAM:0.15%,乌洛托品：0.03%,间苯二酚：0.015%,辅助交联剂：0.03%,氯化铵：0.3%。针对弱凝胶的最优配方进行评价,该配方下弱凝胶具有良好的耐温耐盐性和抗剪切性,且在模拟油藏条件下,弱凝胶粘度仍可保持70%以上。通过填砂管物模实验测得,弱凝胶的封堵率可达97%,持续注入30PV模拟地层水,封堵率保持在93%左右。为了研究调剖体系的注入性和封堵效果,实验室内对调剖体系的注入方式和段塞组合展开了研究。采用先凝胶颗粒,后弱凝胶的顺序注入时,调剖体系的注入性更好,使用段塞为0.5PV凝胶颗粒+0.5PV弱凝胶的复合调剖体系封堵效果最佳。从耿83区块中选择了6口裂缝主向上的注水井进行了耐温抗盐型复合调剖体系的矿场试验,调剖后注水井注入压力明显上升,吸水指数曲线上移且斜率变大,这表明地层裂缝被调剖体系进行了有效封堵。根据对应油井的生产动态数据发现,油井见效率为48.9%,目前日增油15.8t/d,累计增油达4025.4t,取得了良好的增油降水效果。
[Abstract]:Geng 83 block in Jiyuan Oilfield is a low porosity, low permeability reservoir with relatively developed fractures. From the development performance of the reservoir, the main fractured oil wells can see water quickly, and the water cut rises rapidly until water flooding. In order to improve the efficiency of water injection and increase the injection water wave and area, the goal of increasing oil production by precipitation is realized. Combined with the geological characteristics of Geng 83 block and the characteristics of high salinity of formation water, the laboratory study of the complex profile control system with high temperature and salt resistance was carried out. In this paper, precrosslinking gel particles with high strength and adjustable gelation time were selected. As a composite profile control system, the pre-crosslinked gel particles and weak gels were optimized and their properties were evaluated. In order to improve their temperature resistance and salt resistance, the pre-crosslinked gel particles were polymerized by aqueous solution polymerization under the action of initiator, crosslinking agent and other reagents. In this paper, the effect of the amount of each component on the absorbency of pre-crosslinked gel particles was studied. The optimum formulation of pre-crosslinked gel particles was obtained. The initiator was 0.04%, and the crosslinking agent was 0.04%. Toughener: 10.0, acrylic acid: 2.5, total monomer: 30.010, neutralization degree: 20. The performance of precrosslinked gel particles under the optimum formulation was evaluated indoors. The pre-crosslinked gel particles can expand 100 and 15.8 times respectively in clear water and simulated formation water (salinity 16 脳 10 4 mg / L), and are placed in reservoir conditions for 120 days. The water retention is more than 80%. The plugging rate of the gel particles is up to 99% through the sand pipe model experiment, and the continuous injection of 30 PV is used to simulate the formation water scour. The plugging rate is still about 91%. Weak gel is a kind of colloid crosslinked by low concentration polymer under the action of crosslinking agent. The composition of weak gel system was studied. The optimum formula of weak gel was: 1: HPAM: 0. 15%, Ulotropine: 0. 03%, resorcinol: 0. 015%. The optimum formulation of weak gel was evaluated. The weak gel had good temperature and salt resistance and shearing resistance under simulated reservoir conditions. The viscosity of weak gel can still be kept above 70%. The plugging rate of weak gel can reach 97% through sand pipe model experiment, and 30 PV of simulated formation water is continuously injected. The plugging rate is about 93%. In order to study the injectability and plugging effect of profile control system, the injection mode and slug combination of profile control system are studied in laboratory. The injection performance of profile control system is better when the post-weak gel is injected sequentially. Use slug 0.5PV gel particle. The plugging effect of 0.5PV weak gel composite profile control system is the best. Six water injection wells with main fractures upward were selected from Geng 83 block to conduct field tests of the complex profile control system with temperature and salt resistance. After profile control, the injection pressure of injection wells is obviously rising, the water absorption index curve is moving up and the slope is increasing, which indicates that the formation fractures are effectively plugged by profile control system, which is found according to the production performance data of the corresponding wells. The oil well penetration efficiency is 48.9, and the daily oil gain is 15.8t / d, the cumulative oil increase is 4025.4 t, and the effect of oil increasing and precipitation is good.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE39

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