Typical procedure of dilatance treatment of production and injection wells
1. Preparatory works
1.1. Removal of pumping and compressor equipment from the well
1.2. Preliminary geophysical monitoring of the well condition, including caliper measurement, gauging, acoustic cement bond logging, other necessary logging procedures
1.3. Laboratory testing of the core material of the producing formations for determining the dilatance properties of the reservoir formations
1.4. Development of the project of explosive works and its agreement with the Customer and local mining inspection authorities
1.5. Conclusion of the agreement with a geophysical organization for performing the explosive works
1.6. Area planning, removal of unnecessary electromechanical equipment and transport facilities
1.7. Deployment of the charging station (chamber), pulling and running equipment, control and monitoring equipment near the well, testing of their correct operation
1.8. Testing of the grounding circuit
1.9. Pre-running control of passability of the borehole
1.10. Flushing and stopping (if required) of the well
1.11. Control of availability of the depth marks and their correct operation
1.12. Depth marking of the cable (wire) of the pulling and running equipment
1.13. Filling of the well with neutral liquid with surface on the depth of 50-100 meters
1.14. Test running of the dummy torpedo for more precise definition of depth; marking of the depth of torpedo running
1.15. Pre-operation instructing of the personnel, including:
instructing on the project of explosive work and the design of the torpedo
instructing on the procedure of performance of technological operations and safety regulations and labor protection
definition of the safety zones and testing of light and sound alarm systems
securing of the area of operation
2. 2. Technology of work performance.
2.1. Delivery of the explosive substances to the well in the amount and assortment according to the project of explosive works
2.2. Assembly of the necessary number of torpedoes
2.3. Monitoring of hazardous voltages and stray currents, which can cause pre-time explosion
2.4. Testing of the initiation system of the explosive charges
2.5. Attachment of the torpedo to the cable of the pulling and running mechanism
2.6. Running of the torpedo to the preset depth
2.7. Evacuation of the main and servicing personnel to the safe distance from the well
2.8. Checking of the security perimeter, initiation of light and sound alarm signals
2.9. Detonation of the torpedo
2.10. Control of correct operation of the initiation system
2.11. Signaling of completion of explosive works
2.12. Lifting of the cable and remains of the torpedo to the surface.
3. Post-operation works .
3.1. Logging of passability of the borehole
3.2. Geophysical monitoring of the well condition (caliper measurement, gauging, acoustic cement bond logging, gamma and neutron logging, resistivity metering)
3.3. Control measurement of bottom hole pressure and well flow
3.4. Running of the borehole pump and piping equipment, installation of wellhead equipment in case of absence of well flowing
3.5. Commissioning of the well
3.6. Conclusion of the Certificate of work performance and the results of dilatance treatment.
Initial data for the project of dilatance torpedoing of wells – see below.
Main initial data for the project of dilatance treatment of oil, gas and water wells
1. Mining and geological data of the deposit
1.1. Parameters of the oil-producing zone:
a) Depth of occurrence, capacity;
b) Stratification, parameters of producing and non-producing depositions
c) Oil saturation, gas saturation; formation and reservoir (pore) pressure; piezometric levels; their changes in the process of operation; temperature in the interval of producing depositions;
d) Reservoir waters (level of occurrence, watershed boundaries, groundwater mode control)
e) Geomorphology and geotectonics of the oil-producing depositing
1.2. 1.2. Physical and mechanical properties of the reservoir (bearing strata):
a) Parameters of formations forming the producing zone
b) Type of reservoir (porous, fractured, fractured-porous)
Elastic properties of reservoir formations: density, porosity, Young modulus, Poisson ratio, velocity of longitudinal and transverse elastic waves; core samples of the producing zone, top and bottom d ≥ 40 mm and h ≥ 75 mm
c) Strength properties (compression strength, tensile strength, cohesive strength, angle of internal friction)
d) Filtration properties (parameters of filtration channels, effective and stagnant porosity, permeability, filtration coefficient.
1.3. Parameters of the saturating fluid (density, dynamic viscosity coefficient, gas factor).
2. General characteristics of the well.
2.1. Data on well operation:
a) Data of well commissioning
b) Initial production rate (injection capacity) and changing of parameters in the process of operation (indicate flow rate for oil, gas, water and the water cut of the formation fluid)
c) Production rate (injection capacity) of the well for the moment of performing torpedoing operations (indicate separate values of flow rates of each type of fluids)
d) Range radius of the well and the external boundaries of the reservoir
e) Type and production capacity of the borehole equipment, operational depression (repression)
f) Indicate previous use of intensification methods, their parameters and results.
2.2. Well structure:
a) a) Geological cross-section of the producing zone of the well
b) Parameters of the boring casing (depth of well casing, availability of filters and their design, depth of bottom bearing plate)
c) Main dimensions of pipes, steel grade and strength
d) Well caliper logging after boring before cementing
e) Diagrams of acoustic logging of the cement stone
f) Data on the quality of cementing (compression and tensile strength, Young modulus, Poisson coefficient of the cement stone, velocity of longitudinal and transverse waves): Data of the directional survey, maximum inclination intensity
g) Diagrams of electric, gamma and neutron logging and their interpretation); Special data on the boring casing: availability of perforation and its density, dimensions of the perforated holes; hydraulic sealing; condition of the dib hole, etc.
h) Well head equipment.