Objective
The aim of the project is to reduce the exploitation costs of reservoirs affected by water production in production wells and under difficult environmental conditions : offshore, heterogeneities, high temperature, low or very high permeability of reservoirs.
PHASE 1 : Lab work was performed by RWE-DEA and IFP in order to fit in with the different characteristics of the reservoirs in extreme conditions. Technical solutions were investigated for each specific reservoir conditions.
PHASE 2 : Well tests : different candidate wells were proposed by each operating company Elf Aquitaine and RWE-DEA. The feasibility studies included both complementary lab studies in actual reservoir conditions and also numerical simulations in order to deliver a precise design of the treatment and to formulate technico-economical predictions.
Finally 4 well tests were performed instead of the 5 to 7 initially scheduled. Two of them correspond to the high-temperature reservoir conditions (PLOEN-OST, ALWYN NORTH), and two other (MITTELPLATE, BAVO) to the high-permeability reservoir conditions. No appropriate candidate well was found corresponding to the low permeability reservoir conditions.
PHASE 3 : Well tests
PLOEN-OST (RWE-DEA) : a detected casing deformation prior to the treatment did not allow to perform the polymer injection.
MITTELPLATE (RWE-DEA) : the treatment allowed to stop the increase in watercut but the expected reduction could not be achieved presumably because the formation permeability was even higher than expected.
ALWYN NORTH (ELF A) : the treatment was performed in two steps : treatment by polymer of the upper Tarbert reservoir and perforations of the lower Tarbert and upper Ness reservoirs. According to a parametric study in order to evaluate the benefit of the treatment, the uncertainty in incremental oil evaluation is very large. It is therefore not possible to conclude.
BAVO (ELF A) : Immediately after the treatment the watercut stabilized during 2 months to the value before treatment. After this time and until the shut-in of the well large variations were observed both in the watercut and the overall production rate. A full field study is in progress in order to conclude or not to a beneficial effect a posteriori.
CONCLUSIONS :
Lab work gave some promising prospects. 4 patents were filed. 4 field tests were performed.
The purpose of the project is to develop processes for the control of water production in petroleum reservoirs under extreme conditions.
Phase 1 : The foreseen solutions to be developed in the lab are based on :
- low hydrodynamic volume polymers, for low permeability reservoirs
(K < 100 mD)
- formulations containing polymers and thermal stabilizers, for high
temperature reservoirs (T > 95 deg. C)
- low crosslinked polymer systems or alternative gel systems for high
permeability reservoirs (K > 1000 mD) and of low clay content.
Phase 2 : A methodology for in-well tests will be developed according to the following steps :
- diagnosis of water production from exploitation data
- study of sensitivity towards reservoir parameters
- study of the mechanisms of action
- risks of well plugging
- definition of the well test programme.
Phase 3 : A technical and economic evaluation will allow to define the application domains for processes developed within the project.
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Coordinator
92500 Rueil Malmaison
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.