Method for extraction of hydrocarbon deposit. RU patent 2244813.

FIELD: oil extractive industry.

SUBSTANCE: method includes drilling of well and following concurrent heat treatment of productive bed and treatment by pressure waves. Well is drilled in parallel to ceiling or soil of bed. Acoustic properties of system ceiling-bed-soil are examined. Bed oscillation frequencies are determined. Acoustic characteristics of system ceiling-bed-soil are determined and concurrently heat and pressure waves treatment is performed in frequencies range containing spectrum of frequencies in resonance with frequencies of bed oscillations. Length of well is selected divisible by integer number of waves, direction of which is perpendicular to ceiling or bed soil, appropriately to analytical relation.

EFFECT: higher efficiency.

5 cl, 1 ex, 1 tbl, 2 dwg

The invention relates to the field of Geotechnology production of hydrocarbon resources, in particular to methods and modes of stimulation managed physical fields, and can be used for enhanced oil recovery and enhanced oil recovery. The closest analogue of the invention in its technical essence is the invention according to patent RU 2184842 C2, “the Way of the development of oil deposits”. In accordance with this method are drilling oil wells and carry through her simultaneous impact on the formation of a heat source in the borehole, and a source of wave oscillations in the wellhead, with the same oscillation frequency by the harmonic law synchronously with changing frequency and periodically constant phase difference. The warmth and pressure fluctuations are distributed in the layer and affect the filtration processes in it, intensificar oil. The disadvantage of this method is that there is no impact on the formation of pressure variations in the frequencies that are resonant with its own frequency acoustic system roof-formation-sole, and also not the optimal length of the borehole, resulting in not achieved the maximum effect of the application of the method to increase the filtration rate of the reservoir fluid. The present invention is the intensification of the process of filtration reservoir fluid by increasing the efficiency of the heat and wave action on a productive stratum by means of pressure waves with frequencies that are resonant with its own frequency of oscillation of the reservoir at the optimum length of the well. The problem is solved in that in the method development of hydrocarbon fields, including drilling and subsequent simultaneous thermal effects on the producing formation and the influence of the wave field, the wells are drilling parallel to the roof or shoes, are exploring the acoustic properties of the roofing system-reservoir-sole, determine the natural frequency of oscillation of the reservoir, determine the acoustic characteristics of the system, roof-formation-sole, and the effect of the pressure waves is carried out in the frequency range containing a range of frequencies, resonant natural frequencies of oscillation of the reservoir, while the length L k wells in the reservoir is chosen multiple of the number of harmonics of the sound waves, the propagation direction which is perpendicular to the roof or the bottom layer, in accordance with addiction where H is the average thickness of the layer, m; - relative wave impedance system roof-formation-sole; ω i is the natural frequency of oscillation of the reservoir; ω pi - resonance frequency of the pressure waves; k=1, 2, 3,... are integers - the numbers of harmonics that define the length of the well. In private embodiments of the invention, the problem is solved in that the simultaneous exposure to heat and the effects of the pressure waves is realized by means of the coolant in the reservoir through the pressure oscillation generator, installed in the well. As heat transfer fluids used gases and liquids. The natural frequencies ω i fluctuations of the reservoir is determined in accordance with dependencies where π =3,14 - constant value; C is the speed of propagation of longitudinal vibrations in the reservoir, m/s; i=i min i min +1; i min +2; i min +3;... i max - number harmonics of the sound waves, the propagation direction which is perpendicular to the roof or the bottom layer; - the minimum value of the harmonic number, rounded up to a larger integer; - the maximum value of the harmonic number, rounded up to a larger integer; ω min ω max - lower and upper bounds of the range of cyclic frequencies, Hz. Acoustic performance of the roofing system-reservoir-sole is determined in accordance with dependencies where δ - attenuation factor system roof-layer sole, -1 ; R - wave impedance layer, kg/(m 2 ·); R kr is the wave resistance of the roof, kg/(m 2 ·); R n is the wave resistance of the soles, kg/(m 2 ·); ρ , ρ kr ρ n is the density of the layer, top and bottom, respectively, kg/m 3 ; C c CR , n is the speed of propagation of longitudinal vibrations in the reservoir, the top and bottom, respectively, m/s Resonant frequency ω pi frequency spectrum of the generated pressure waves is determined in accordance with addiction The essence of the invention lies in the fact that in the presence of the temperature field of the pressure oscillation generator, installed in the well, forms a pressure wave with frequency range, the resonant natural frequencies of oscillation of the formation and the borehole is selected multiples of a whole number of waves, the propagation direction which is perpendicular to the roof or the bottom layer and coincides with the direction of the well. The reservoir, limited overlying and underlying rocks - top and base, represents, from the point of view of acoustics, the waveguide having an acoustic characteristic, which is determined by the thickness and acoustic properties of the formation, the acoustic properties of the top and bottom. The well in the reservoir is a linear source of heat and wave fields. Wave field most effectively in that case, if the direction of propagation of pressure waves is perpendicular to the roof or the bottom layer, i.e. the well must be drilled parallel to the roof or sole. The effectiveness of these waves is due to the fact that they are repeatedly reflected from top and bottom, fade, leaving the volume of the reservoir, the limited length of the well. Waves incident on the top and the bottom at an acute angle, after multiple oblique reflection leave this volume; energy bygone waves is lost to the zone of length equal to the length of the well. The length of the well as one of the dimensions of the resonant volume of the reservoir can not be arbitrary. She must be a multiple integer of the number of harmonic sound waves directed along the axis of the borehole. The method is implemented as follows. In the presence of thermal effects investigate the acoustic properties of the roofing system-reservoir-sole and using structural properties of the reservoir and thermophysical properties of fluid, determine the range of characteristic frequencies of stimulation, f∈ [f min, f max ], then the range of cyclic frequencies ω ∈ [ω min ; ω max ], where ω =2π f. In addition, determine the natural frequencies of the reservoir in accordance with dependencies where ω i own the oscillation frequency of the i-th rooms, Hz; π =3,14 - constant value; C is the speed of propagation of longitudinal vibrations in the reservoir, m/s; H is the average thickness of the layer, m; i=i min i min +1; i min +2; i min +3;... i max - number harmonics of the sound waves, the propagation direction which is perpendicular to the roof or the bottom layer; - the minimum value of the harmonic number, rounded up to a larger integer; - the maximum value of the harmonic number, rounded up to a larger integer; ω min ω max - lower and upper bounds of the range of cyclic frequencies, Hz. According to a study of the acoustic properties of the system roof-formation-sole determine its acoustic characteristics in accordance with dependencies where δ - attenuation factor system roof-layer sole, -1 ; R - wave impedance layer, kg/(m 2 ·); R kr is the wave resistance of the roof, kg/(m 2 ·); R n is the wave resistance of the soles, kg/(m 2 ·); ρ , ρ kr ρ n is the density of the layer, top and bottom, respectively, kg/m 3 ; with kr , n is the speed of propagation of longitudinal vibrations in the reservoir, the top and bottom, respectively, m/s; N - average reservoir thickness, m Then determine resonant frequency ω pi spectrum generated by pressure fluctuations in accordance with addiction While a number of lengths of the wells in the reservoir and harmonics that define these lengths must satisfy the relation where H is the average thickness of the layer, m; - relative wave impedance system roof-layer sole, kg/(m 2 ·); k=1, 2, 3,... are integers - the numbers of harmonics that define the length of the well. The choice of the optimal length, for example, horizontal wells drilled parallel to the roof or sole, as follows. For example, on the basis of technological studies defined the length of the borehole . From equation linking the length of well with a number of harmonics at ω i /ω pi =1 (when i≥ 3 this ratio is almost equal to one), determine the value of the harmonic which will be rounded up to the nearest integer k. The value of k is used to specify the length of the borehole by the formula (4). For example, Mordovo-Karelskogo deposits of natural bitumen Tatarstan will make the calculation of the characteristics of heat-wave resonance of the effects on bitumen layer in terms of horizontal wells. Research bituminizing layer on the cross section of wells No. 119 and 140, the following data: the depth of the productive formation Y=90-100 m; - thickness of the productive formation in average, N=10 m; - porosity m=0,33; - the range of values of the diameter of pores: d min =0.02 mm=2· 10 -5 m; d max =0,04 mm=4· 10 -5 m The composition of the rocks: - layer top - lingul shale, gas-bearing sandstones; productive stratum is dense and soft sandstones saturated with bitumen; the bottom layer is water-bearing sandstones. Physical properties of rocks: - density clay ρ g =1440 kg/m 3 ; - the speed of sound in it with g =1600 m/s; - density gas-bearing Sandstone ρ se =1720 kg/m; - the speed of sound in it se c =1500 m/s; - the density of Sandstone saturated with bitumen ρ =2040 kg/m 3 ; - the speed of sound C=1900 m/s; - the density of the aquifer Sandstone ρ VP =2050 kg/m 3 ; - the speed of sound c VP =2250 m/s Thermophysical properties of reservoir rock: - heat capacity c p =0,83 kJ/(kg· K); - conductivity λ =1,22 W/(m·). Thermophysical properties of bitumen: - density at 20° ρ W =960 kg/m 3 ; - heat capacity c W =2.0 Kj/(kg· K); - conductivity λ W =0,117 W/(m· K); the dependence of the viscosity of the bitumen temperature, Pas·; μ (t)=2,114· exp(-0,0437· t), where t is temperature, ° C. The parameters in the considered thermal field: the maximum temperature t max =of 218.6°; - average temperature ; - minimum temperature t min =126,2°; the viscosity of the bitumen at t max ° C:=of 218.6°: μ (t max )=1,64· 10 -4 PA·; the viscosity of the bitumen at t min =126,2°: μ (t min )=8,95· 10 -3 PA· C. Characterization of heat-wave resonance method of stimulation is performed in the following order. 1. Determine the minimum and maximum values of the characteristic frequencies of the frequency range of stimulation, Hz: 2. The values of the cyclic frequency corresponding to the values of the characteristic frequency, Hz: ω min =2· 3,14· 150=942, ω max =2· 3,14· 8140=51120. 3. The minimum and maximum harmonics of the own frequencies of the reservoir: 4. The values of the cyclic frequencies of the reservoir, Hz: ω 2 =1194 ω 40 =23880 ω 3 =1793 ω 60 =35820 ... ... ω 10 =5969 ω 70 =44760 ... ... ω 20 =11938 ω 86 =51342 Here are just some of the frequencies of the considered spectrum showing the intensity increasing frequency with increasing number of harmonics. 5. The wave resistance of the roof of the reservoir is calculated as the arithmetic mean value of the impedances linguoboy clay and gas-bearing Sandstone, kg/(m 2 · (C): 6. The value of the impedances of the reservoir and soles, kg/(m 2 · (C): R=2,04· 1,90· 10 6 =3,88· 10 6 , R n =2,05· 2,25· 10 6 =br4.61· 10 6 . 7. The value of the relative wave resistance system roof-formation-sole: 8. The attenuation factor of the oscillation system, top, and bottom, with -1 9. Range of resonant frequencies of the generator radiation of pressure waves, Hz: ω p10 =5979, ω R =35821, ... ... ω P20 =11944, ω P80 =44761, ... ... ω P20 =23888, ω R =51343. 10. Determination of the optimal values of the well depth. For example, the initial length of the horizontal well . Determined harmonica by the formula (5) Taken k=6. The optimal length of the well in accordance with the formula (4), m: Thus, the initial length of the bore coincides with the length of a borehole, which provides the resonance effect of the wave field on the layer. If the original length of the bore will be substantially less than the length, providing a resonant effect of the wave field on the layer, it is necessary to choose equal to the length L of k . 1 shows a diagram productive bitumen layer and the 6th harmonic of the pressure fluctuations along the borehole; figure 2 shows the distribution of harmonics across the reservoir. Table 1 shows the lengths of the wells, which are provided with the resonant vibrations of the given layer. From table 1 it is seen that with the increase of the number of harmonics relative increment of the length of the borehole is reduced; therefore, for large values rooms Table 1 harmonic Number, k the length of the bore L k , m 2 28 3 47 4 65 5 83 6 102 7 120 8 138 9 156 10 175 harmonics length of the well is practically continuous, i.e. the effect of the discrete nature of the harmonic number k disappears. 1. The way of the development of hydrocarbon fields, including drilling and subsequent simultaneous thermal effects on the producing formation and the influence of pressure waves, characterized in that the wells are drilling parallel to the roof or shoes, are exploring the acoustic properties of the roofing system - reservoir - sole, determine the natural frequencies of the reservoir, determine the acoustic characteristics of the system, roof - formation - sole, and the effect of the pressure waves is carried out in the frequency range, the resonant eigenfrequencies of the reservoir, while the length L k wells in the reservoir choose a multiple of a whole number of waves, the propagation direction which is perpendicular to the roof or the bottom layer, in accordance with addiction: 2. The method according to claim 1, characterized in that the coolant used gases and liquids. 3. The method according to claim 1, characterized in that to determine the natural frequencies ω i fluctuations of the reservoir in accordance with dependencies 4. The method according to claim 1, characterized in that the acoustic characteristics of the system roof - layer sole is determined in accordance with dependencies 5. The method according to claim 4, characterized in that the resonant frequency ω pi pressure waves is determined in accordance with addiction