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Ultrasonic extraction technology in the island Oilfield


Field application shows that the process is simple construction, significant effect of increasing oil production, ease of large area. Key words: ultrasound; plugging; wax; cavitation; viscosity in the oil mining process, often due to various reasons, some of the wells in the formation of the blockage. Hinder the oil into the wellbore, reducing formation permeability. Ultrasonic extraction technology is handled by sound production wells, injection wells near oil wells, the physical properties of reservoir and fluid flow changes, to improve the flow of near wellbore bottom conditions and the permeability, lift wells, injection wells congestion. 1 working principle of ultrasonic extraction system composed of 1.1 increase of oil equipment, ultrasonic positioning system mainly by the magnetic,[link widoczny dla zalogowanych], special transmission cable, high-power ultrasonic transmitter and ultrasonic acoustic signal converters and other components. It uses ground-vehicle power generated by high-power ultrasonic transmitter oscillator signal pulse,[link widoczny dla zalogowanych], through special transmission cable, the pulse oscillation signal transmission to the reservoir of the piezoelectric ceramic electro-acoustic converter, the power converter converts the sound wave, injected into the oil formation. 1.2 The main technical parameters of ultrasonic equipment increasing oil is the latest Chinese Academy of Sciences Institute of Acoustics by absorbing international advanced technology, the maximum output power RMS, peak, underground sound intensity RMS, peak, the host output frequency range, electro-acoustic transducer conversion rates and other indicators have been greatly improved; transmission cable skin effect loss of IF significantly reduced the main technical parameters: ultrasonic electro-acoustic converter: 1.2.1 Maximum working voltage: r: T a 1:5, VP -P a 3000V1.2.2 field intensity: CW: 45kw / m; pulse wave: 180kw / m; 1.2.3 Resonant Frequency: 19.2KHz; 1.2.4 Pressure: 30MPa; 1.2 .5 Temperature: 200 degrees Celsius, allowing the work: 100h; 1.2.6 weight; 45.6kg,[link widoczny dla zalogowanych], OD; ~ 88mm, length: 2150ram. 1.3 Impact 1.3.1 Mechanism of cluster emission oscillation exfoliation strong directional ultrasonic role in the oil, oil liquid,[link widoczny dla zalogowanych], oil and solid particles will rock together with the ultrasonic vibration, due to the liquid, rock, solid particles of the inherent different frequencies, so each of the vibration acceleration and amplitude are also different, resulting in two phase states of the relative motion material interface, so that: 1.3.1.1 obstruction particles and rocks, water and particles between the pro-income issued Date: 2OO8 A O4 O5 and force a reduction, resulting in relative motion and loose, mobile, and lifted block; 1.3.1.2 of the original hose attached to the rock porosity and the dirt trail off, with the flow of wellbore fluid, to clear the oil flow passage; 1.3.1.3 oil-water interface in the ultrasound, the formation of water in oil or oil in water emulsion liquid, which reduces the liquid's viscosity, an increase of liquidity. 1.3.2 The role of crude oil viscosity reduction of cavitation noise in a strong field, the molecular structure of the volatility in crude oil under the effect of the cyclical permutations and combinations and produced many small bubbles, small bubbles in the process of annihilation, and its internally generated ultra-high temperature and pressure, this local energy can break the molecular bonds of crude oil,[link widoczny dla zalogowanych], which produce cracking, a fundamental change in the crude oil properties, thereby reducing the viscosity of crude oil. 1.3.3 Wax (scale) wax (scale) effect of the strong acoustic field, the wax (scale) before without condensing into very fine particles suspended in oil, so that long-chain molecules cracking and reduce curing intensity; crude oil caused by temperature increase the absorption of ultrasound in liquid surface of the solid boundaries, the sound can convert a lot of heat, the formation of the interface at the local high temperature and even ionization effect, which can effectively prevent wax deposition (scale). Above aspects of the role of integrated applied to the reservoir, can ultrasound obstruction within the loose dirt particles from the rocks on the peel off, reduce the flow of liquid viscosity increases, the oil flow to clear the pores and washing the rock pore and throat, to relieve congestion purposes. 2 Conclusions and recommendations 2.1 The next step of the process conditions of the well is small, regardless of reservoir water sensitivity, acid sensitivity moist reaction, from reservoir rock properties of the limit. 2.2 The compatibility of the technology may be mechanical, chemical, thermal and a combination of measures applied, as was ultrasound washed the surface of rock and throat than the chemical method is smooth, easy attachment of dirt particles, so the validity of plugging longer. '2 .3 The implementation of the process, wax oil wells for the island and near wellbore area of the oil wells control block provides a good idea. [
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