WELLWORK EFFICIENCY PLANNING AND EVALUATION
Alstron Group of Companies offers services for a set of operations on planning and evaluation of wellwork efficiency.
The planned and implemented process of development of the oil or oil and gas deposit requires not only continuous control but also constant regulation (management) by deposit stimulation through key and production wells. This effect affects the filtration flows into the formation e, i.e. it changes the hydrodynamic features of the development site. Therefore, methods for controlling the development of an oil deposit can be referred to as hydrodynamic methods for enhanced oil recovery (HEOR) since the ultimate goal of the regulation is to increase the current or final formation oil recovery.
Determination of the energy state of deposit makes it possible to estimate current state, to select candidate wells and to determine the best hydrodynamic mode of oil deposit development.
RD 153-39.0-110-01 Methodical Manual has classification of hydrodynamic methods of enhanced oil recovery by the difference in implementation technology and degree of their effect on productive formations.
These methods include:
- In injection wells:
- Increase of injection pressure;
- Cyclic flooding, i.e. periodic reduction (termination) of water injection;
- Reallocation of discharge of the pumped site by the groups of injection wells (change of directions of filtration flows);
- Simultaneous separate water injection into different formations through one well;
- Selective water injection into low-permeable interlayers and formations, zones and areas;
- Limitation or termination of injection into high-level permeable interlayers;
- Methods of bottomhole zone treatment which change the mode of operation and restore the well potential (mud pulse, wave impact, etc.);
- Mechanical methods of changing modes of injection wells operation.
In production wells:
- Change of fluid sampling as a whole on the development item, on a separate formation, unit, zone, site or group of producing wells;
- Forced fluid sampling from the groups of wells or from separate wells of this section, zone, unit;
- Periodic temporary shutdowns and runs of groups of wells or individual wells;
- Simultaneous and separate operation of wells in multi-area facilities;
- Optimization of pressure differences between formation and bottomhole pressures;
- Multiple internal impact on water inflow limitation (insulation operations);
- System treatments of the bottomhole zone, formation hydraulic fracturing, internal increase of well productivity (perforations, reperforations, etc.);
- Drilling of the second and horizontal shafts.
