Industrial Equipment for Intensification of Oil and Gas Wells
Development, Manufacture, Tests and Introduction into the Oil and Gas Industry of the Electrohydroimpulse Action Equipment Affecting upon Productive Oil and Gas Layers Aimed at Magnification of Yields of Productive Wells. Preparation for Serial Production
Tech Area / Field
- NNE-FUE/Fuels/Non-Nuclear Energy
3 Approved without Funding
NIIEFA Efremov, Russia, St Petersburg
- Plekhanov State Mining Institute, Russia, St Petersburg
- Schlumberger Cambridge Research Center / Schlumberger Reserach and Development Inc. / Schlumberger Research & Development, Russia, Moscow, Russia, Moscow\nForschungszentrum Karlsruhe Technik und Umwelt / Institut für Hochleistungsimpuls und Mikrowellentechnik, Germany, Karlsruhe
Project summaryNow the world consumption of hydrocarbons (oil and gas) several times exceeds the rate of growth of their reserves. In this connection, it is very actual to develop the direction of research activities aimed at increasing of coefficient of extraction of hydrocarbons from exploited wells, magnification of their yields, preparation for involving into operation non-working (because of small productivity) wells.
It is known that permeability of collector rocks and yields of wells decrease after long-lived operation in well sides because of resinous and asphalt depositions and other factors. There are different methods of restoration of well yield. For example, oil and gas are pressed out of a layer by filling fluid into it.
Another method is those with the deposition of powder charges within wells, and at the time of explosion shock waves spreading in fluids attack both walls of wells and hosting collector rocks that gives a positive effect. Besides, there are methods of handling wells with chemical reagents, and methods of thermal actions. However, most of the specified technologies are expensive, require high level of the safety measures, and lead to negative ecological consequences.
The method of oil and gas well handling with high-voltage electrohydroimpulse discharges is also used. These discharges are generating shock waves in fluids filling wells. However, the use of this method faces complicated technical problems because of need to have a high voltage pulse with amplitude about 50 kV on spark gap electrodes. Thus, the high-voltage pulse generator should be installed in the well device which diameter does not exceed 100 mm.
The efficiency coefficient of conversion of the discharge energy into the shock waves energy essentially depends on composition of fluid, its temperature, and on hydrostatic pressure which can be very large in a well with its depth of several kilometers. In many cases, the mentioned factors result in essential diminution of efficiency of application of this technology.
All above-described negative factors are eliminated when a spark gap with the explosive wire is used. The discharge stability at the high-energy conversion efficiency coefficient of discharge energy into energy of shock waves remains invariable at operations of a spark gap in variable fluids with different physico-chemical properties. Besides, for discharge generation at its initiation by explosive wire it is enough to give voltage pulses with amplitude (2-3) kV on an electrode of the spark gap. This essentially simplifies a construction of the pulse generator in a small well device. However, wide application of the spark gaps of this type have not achieved by now because of complicated construction of the mechanism for multi-time explosive wire delivering (up to 2000 working cycles) without uplifting the well generator on the surface.
In 1996-97, the collective of the employees of NIIEFA and SPSMI created a perspective experimental model of the well generator"INFLOW-1" with electrohydroimpulse spark gap on the basis of an explosive wire. The original mechanism of explosive wire delivering was created. The experimental model was tested in oil fields of Bashkiria, Tatarstan and Tyumen. Positive effects were obtained everywhere: yields of oil wells after their handling were incremented by tens and hundreds percent.
However, making industrial model of the generator with the high resource and reliability requires to carry out optimization a power supply and control schemes, to improve the spark gap construction, to execute the engineering specifications, to make experimental improvement of equipment both on the stand and in oil and gas wells with the different geological and technical conditions and physical properties of productive layers.
The well generator with a spark gap of the above-described type can be used as a vibration source for vertical seismic profiling and inter-well seismic acoustic sounding of rocks, and also for clearing filters of water supply wells.
Advantages in comparison with alternate methods: low expenditures of material resources at considerable increase (2-6 times) of yield of oil and gas productive wells, magnification of the oil – water ratio of the extracted fluid, magnification of extraction coefficient of oil and gas by 10-15%, complete safety conditions while carrying out operations, excluding the ecologically harmful consequences.
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