Injection Wells Profile Control Technology Research In Wuli Bay Area Of Jing’an Oilfield

Jing’an Oilfield belonging to the "low permeability, low pressure, low-yield" three low oilfield in Ordos Basin.In1997,oilfield into full the waterflood development stage, in order toachieve high-yield wells and the purpose of the stable.When the water flooding into the mid-and late, because the formation natural micro-cracks, fracture and heterogeneities in seriouscondition, and resulting in water flooding efficiency, sharp drop in the degree of recovery ofthe reservoir, the main well is serious flooding, lateral wells flooding on behalf of the result isnot satisfactory.Through inspect the literature investigation at domestic and foreign,the cometo the current also not have a special kind to suitable for low permeability and fracturedreservoirs of the adjustment a cross-sectional technology.This thesis based on the geological characteristics of the reservoir and fluid propertiesWuli Bay area in Jing’an Oilfield,through its fractured reservoir characteristics andheterogeneity, to carry out the indoor experiment preferred polymer profile control agent’sformulations.The best formula is preferred a partially hydrolyzed polyacrylamide (HPAM)polymers, together with the cross-linking agent, accelerator and stabilizer.Profile control agentis evaluated through the static test and dynamic core flow tests in low permeability fracturedreservoir conditions gelation time, into a gel strength, salt resistance, temperature resistance,stability over time, compressive strength, select injectioninjection profile improvement rateand oil displacement efficiency.Experimental results show that: the weak gel profile controlagent into the gel time and into the gel strength is moderate, good stability, good pluggingeffect of different permeability cores. The weak gel profile control agent can be used toimprove the water absorption profile of the formation, its overall performance to meet Jing’anOilfield reservoir profile control operational requirements.On the basis of these studies, a district of Jing’an Oilfield Wuli Bay reservoir pilot testresults show that the technology can be a more substantial upgrade injection pressure toimprove water absorption profile of the reservoir water injection wells.Profile control agentplayed a certain role in blocking cracks and high permeability layer, the reservoir spentsignificantly improved see the increase of oil precipitation effect, a substantial increase in thedegree of oil recovery. The technology is to improve the of Wuli Bay area reservoirs, the development of high water cut stage an effective measure of the effect.Weak gel profilecontrol technology is an effective way to enhanced oil recovery for low permeability fracturedand heterogeneous reservoirs, the enhanced oil recovery technology in such fields has a verybroad application prospects.