Abstract
The problem of injected water channeling along fractures exists in the process of water injection in fractured low permeability reservoir, aimed at this problem, deep profile control technology applies to plug fractures to improve the recovery of low permeability reservoir. In this paper, partially hydrolyzed polyacrylamide (HPAM) is used as water-plugging/profile-modifying agent and phenolic resin as crosslinker agent. Several profile control systems are tested to find the one which is suitable for fractured low permeability reservoirs. The performances of profile control systems are evaluated, and effects of formation water salinity, that of shearing rate and that of temperature on the performance are studied. Finally, in order to study effects of this profile control system on displacing oil, flowability experiment and core displacement experiment are applied. It shows that with the increase of salinty of prepared water and the increase of the shearing rate, the viscosity of this system decreases. With the increase of temperature, the gelling time shortens, the viscosity increases, but the stability weekens. This kind of profile control system has a good effect on plugging fractures of low permeability cores. After water flooding, this kind of profile control system is injected into cores, the recovery ratio can increase 3.5%. So the profile control system composed of HPAM/ phenolic resin can apply to deep profile control in fractured low permeability reservoir to enhance oil recovery.
Highlights
Injected water flows into oil wells along the connected channels, so it is difficult for injected water to enter into the lowpermeability matrix
The gelled profile control agent can plug fractures, which can make the subsequently injected water enter the lowpermeability matrix and displace the remaining oil to further improve the recovery of the fractured lowpermeability reservoir[11,12]
In this paper, hydrolyzed polyacrylamide (HPAM) is used as a water-plugging/profile-modifying agent, and phenolic resin is used as a crosslink agent
Summary
Injected water flows into oil wells along the connected channels, so it is difficult for injected water to enter into the lowpermeability matrix. It is difficult for oil in a lowpermeability matrix to be displaced effectively This is the main reason why water flooding is not effective in most fractured low-permeability oilfields [5]. Once fractured low-permeability reservoirs enter the middle and high water cut stages, it is more difficult to further enhance oil recovery. The gelled profile control agent can plug fractures, which can make the subsequently injected water enter the lowpermeability matrix and displace the remaining oil to further improve the recovery of the fractured lowpermeability reservoir[11,12]. This paper can guide the development of fractured and low-permeability reservoirs in the high water cut stage
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