Water production method

FIELD: water production from boreholes.

SUBSTANCE: method involves drilling production and injection borehole systems; penetrating borehole by perforation thereof; applying vibroacoustic pressure oscillations to formation, wherein the pressure oscillations are excited by acoustic borehole tools lowered in boreholes; producing water from boreholes. Injection borehole pipes are not perforated and are filled with working liquid. Acoustic oscillations are initially applied to production boreholes so that pressure in production boreholes preliminarily filled with fracturing liquid should be at least 2 times greater than formation breakdown pressure. Acoustic borehole device is located within perforation area. After crack opening water is lifted from production boreholes. During water lifting acoustic pressure oscillations are applied to formation through injection boreholes.

EFFECT: provision of water production in dry territories, increased economy and efficiency.

 

The invention relates to the mining industry and can be used for stimulation of groundwater from irrigated areas, water-saturated porous deep underground reservoirs and its extraction from boreholes.

In the mining industry to stimulate the flow of liquid minerals widely used method of hydraulic fracturing to create fractures in the near-wellbore area of the formation (patent RU N2183739, IPC E 21 In 43/26, publ. 2002.06.20), which is to use the powder generator pressure PGD, placed in the region of the perforation of the casing, a fluid-filled gap. After blowing up the powder charge hydrodynamic impulse of high pressure forms in the layer system of cracks that rasklinivanie propping agent in the form of calibrated proplant, and cracks are not able to close, and this is achieved by improving the productivity of the formation.

This technology requires a lot of energy, a significant flow of powder charges and chemicals.

The known method (patent RU №2203412, E 21 IN 43/26, publ. 2003.04.27) create water hammer using a plunger pump, carrying out the injection pressure in the pump-compressor pipe (tubing) and reset when the plunger is in its extreme upper position. The pressure pulses propagate in a closed, fully C is acted upon by the fluid well and underlying productive interval isolate cementing the bridge. The pulse pressure that is greater than the burst pressure rocks leads to the formation and propagation of cracks, which rasklinivanie of debris.

The disadvantage of this method is the high energy costs, the emergence of large shock loads, the need for special injection materials for wedging cracks. In addition, such methods cannot be used for the extraction of water from wells in arid or desert regions of the globe.

Known selected as a prototype method for processing bottom-hole formation zone, and water wells (patent RU 2191896, EV 43/25, publ. 2002.10.27). The method includes vibration wave impact on the bottomhole formation zone using hydrodynamic oscillator, reducing the pressure at the bottom hole reservoir below with simultaneous vibration wave exposure and blood pressure in the absence of forcing, the change in pressure produced in cycles, and the cycles of increasing pressure to produce hydrodynamic testing of bottom-hole zone of the well, and in cycles of low pressure to produce the correction processing mode and judge the appropriateness of termination of loops.

The disadvantages of this method is similar to what dostatkem the above analogues and are high energy and other costs.

The objective of the proposed method is to remedy these shortcomings, ensuring the collection and extraction of water in arid areas, enhancing the efficiency and effectiveness of the method.

Tasked with achieving the specified technical result is achieved due to the fact that in the method of water extraction, which includes the drilling system of production and injection wells, opening wells perforation, the vibration wave impact on the formation of acoustic pressure oscillations excited by acoustic downhole devices engrossed in well, and the continuous rise of water from wells, while the tubes injection wells not reveal perforated and filled with the working fluid, and the effect of acoustic pressure variations carried out first in producing wells, creating a pressure exceeding the pressure of the fracturing is not less than 2 times, filling her pre fluid gap, and acoustic downhole device is placed in the perforation zone, and after the cracks begin lifting water from wells, in which the impact on the formation of acoustic pressure fluctuations are carried out through injection wells.

For increasing the volume and velocity of water movement in saturated porous arrays COI the box is used the possibility of obtaining dilatancy (volume change due to plastic, irreversible deformation geotextiles, generating microbrain and fissures) of the skeleton matrix of the reservoir rock. Downhole acoustic device (patent RU №2191258) working in the zone of plastic deformation, creating a pressure in excess of 2 times or more the pressure of hydraulic fracturing, which is determined by the geological structure and, for example, for fields in Western Siberia is 26-28 MPa. The essential feature for achieving these objectives is the need to create conditions for hydraulic fracturing in each commissioned the producer, because it would create the conditions for maintaining in the aqueous layer of the conditions of dilatancy of the skeleton matrix of the breed and save the cracks in the open state. Acoustic effects at a frequency above 2 kHz leads to high strain rate, which in turn increases the value of the dynamic impact on the breed and much higher static strength, which creates certain opportunities to achieve ductility in the material of the skeleton matrix of the breed.

These values increase operating pressures associated with the establishment and maintenance of a significant dilatancy of the skeleton matrix of species and changes in the volume of rock in the direction of decreasing and increasing (up), which is the result of changes in the elasticity skel is the breed to plastic deformation.

The higher the pressure generated by the acoustic radiation, the more cracks formed during fracturing. The presence and number of vertical and horizontal cracks in the first place, depends on the depth of the water-saturated formation, as well as the presence and magnitude of vertical and horizontal lithostatic pressure field. This means that all of the critical state of the porous matrix are determined by the effective stress. The porosity depends on the volumetric deformation and from the first pressure. When the pore volume reaches a critical level there is an important change: seal A. changes to its loosening, which can only be explained by the process of dilatancy - volume changes of the skeleton matrix of the rock, which leads to the formation of filtration flows saturating fluid.

The method is as follows.

Producing wells perforined, fill with fluid gap, for example water, put them in acoustic downhole device, such as described in patent RU №2140519, RU # 2191258, and produce hydraulic fracturing, creating acoustic pressure is 56 MPa, exceeding the burst pressure of the breed in 2 or more times. About the process of hydraulic fracturing is judged by declines in water levels in the production wells, then acoustic downhole device retrieve the cabins of the producing wells and lower in pressure, filled with the working fluid, through acoustic stimulation by excessive pressure, and production wells with pumps begin to lift the water. As the working fluid and the fluid gap use any available technical water.

Thus, the proposed method of water extraction is a new technology for the collection and extraction of water on the surface in the absence of industrial water in the vast lands and territories. The efficiency and effectiveness of the proposed method are obvious.

The method of extraction of water from wells, including drilling system of production and injection wells, opening wells perforation, stimulation of the acoustic pressure variations induced acoustic downhole devices engrossed in well, and the continuous rise of water from wells in which pipe injection wells not reveal perforated and filled with the working fluid, while the effect of acoustic pressure variations carried out first in producing wells, creating a pressure exceeding the pressure of the fracturing is not less than 2 times, producing wells pre-fill fluid gap and offer acoustic downhole devices in areas of the perforation, and after crack formation start lifting water from wells, in which the impact on the formation of acoustic pressure fluctuations are carried out through injection wells.



 

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