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- Title
一种耐高温调堵剂的制备与应用.
- Authors
姚大伟; 张磊
- Abstract
Aiming at the problems of high reservoir temperature, unbalanced injection and production, and prominent contradictions between layers in the late development stage of high water-cut oil reservoirs in medium and high permeability reservoirs, a high temperature resistant and high viscosity elastic profile control and plugging agent was prepared by taking high viscoelasticity gel powder as the main agent, adding a certain amount of urotropine, sodium hydroxide, water swelling granular plugging agent and one-way pressure sealing agent. The gelling performance, thermal stability, plugging performance and compatibility with CO2 of the profile control and plugging agent were evaluated, and the field application was mentioned. The optimized formula of the plugging agent was as follows: 2% high viscoelastic gel powder+4% granular plugging agent+4% single pressure sealing agent+0.9% urotropine+1.0% sodium hydroxide. The plugging agent could not form a gel at room temperature and could be smoothly pumped into the formation to ensure construction safety. After curing at the temperature of 120℃ and 150℃, the gelling time of the plugging agent was 492 min and 286 min, respectively, and the gelling viscosity was 11806 mPa·s and 11250 mPa·s, respectively, resulting in forming a high viscoelastic semi-solid gel. The plugging agent had a temperature resistance of above 150 ℃, good pressure bearing capacity and selectivity, and could achieve targeted plugging, effectively control the dominant water flow channel of the reservoir, and improve the water absorption profile. The plugging agent had a significant effect in on-site application. After the shallow profile control of L90-58 well, the average daily oil production of the corresponding oil well increased by 3.38 t, and the water content decreased by 19.15%, achieving good water control and oil increase effects.
- Subjects
WATER temperature; THERMAL stability; PETROLEUM reservoirs; HIGH temperatures; OIL wells; OIL field flooding; GELATION; VISCOELASTICITY
- Publication
Oilfield Chemistry, 2023, Vol 40, Issue 3, p414
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2023.03.006