Method and device to measure technological parameter of fluid medium in well
FIELD: measurement equipment.
SUBSTANCE: system (100) of sensors for measurement of a technological parameter of a fluid medium in a well location, comprising a resonator (110) of a parameter, which is located in a well (106), having resonance frequency that varies depending on the technological parameter of the fluid medium and which in response generates a resonant acoustic signal on the resonance frequency that indicates the technological parameter. Besides, the system comprises an acoustic sensor (118), arranged in the location near above the surface, spaced from the parameter resonator, a measurement circuit (102), connected with the acoustic sensor, and an acoustic source connected with a pipe in the location near above the surface and spaced from the parameter resonator placed in the well. At the same time the acoustic sensor is made as capable of receiving the resonant acoustic signal, transmitted from the parameter resonator, the measurement circuit is arranged as capable of formation of an output signal of the technological parameter, corresponding to the technological parameter of the fluid medium, in response to the received resonant acoustic signal, and the acoustic source is arranged as capable of transmission of the acoustic signal into the well.
EFFECT: provision of measurement of well fluid medium properties in real-time mode both in process of drilling and in process of well operation.
20 cl, 6 dwg
BACKGROUND of the INVENTION
 the Present invention relates to measurements in wells. More specifically, the present invention relates to the measurement of technological parameters of the fluid in the zone downhole in the well.
 Deep wells are known structure for the extraction of fluid from the bowels of the earth. The technique of drilling refers to the most advanced technology, and developed many techniques to increase the depth of the wells and also many of their configurations.
 During the drilling and operation of deep wells such as oil wells, it is often necessary to measure process parameters of the fluid at the place level in the area of the face" wells. Such process parameters include pressure and temperature. However, the area of the bottom of a deep well can have a very adverse environment. Pressure can exceed 15,000 lb/in2(105 MPa) and temperatures can reach 375 degrees Fahrenheit (191°C). In addition, the distance from the surface to locations in the area of the bottom of a deep well can be considerable, for example more than 15,000 ft (4575 m). Thus, the installation of measuring equipment in the deep place of burial in the area of the face causes considerable difficulties, and any such equipment must be strong enough to the a u se, to withstand harsh environmental conditions. In addition, the results of any measurements, carried out at the place of burial in the area of the bottom of a well, shall be transmitted to the surface.
 a sensor System for measuring a process variable of the fluid in the first location, comprising the resonator parameter, located in the first location and having a resonant frequency varying depending on the technological parameter of the fluid, which in response generates a resonant acoustic signal at a resonance frequency, indicating technological parameter. Acoustic sensor located in the second location, spaced from the resonator parameter is configured to receive the resonant acoustic signal transmitted from the oscillator parameter. The measurement scheme, coupled with an acoustic sensor configured to transfer the output signal of the technological parameter corresponding process parameter of a fluid medium in response to the accepted resonant acoustic signal.
BRIEF DESCRIPTION of DRAWINGS
 figure 1 shows a simplified schematic cross-section of the well.
 figure 2 shows a diagram of a retaliatory response.
 figure 3 shows a block diagram of a device according to one version done by the means of the present invention for measuring a parameter of the fluid at a location in the zone downhole in the well.
 figure 4 shows a cross section of one example of a variant of implementation of the resonator parameter.
 figure 5 shows another example of a resonator of the option embedded in the pipe wall.
 figure 6 shows a diagram of a tuning fork.
DETAILED DESCRIPTION of ILLUSTRATIVE embodiments
 the Wells are used to extract the fluid, such as oil, from shallow wells under the ground. During drilling and other operations, may be appropriate measurement properties of the fluid ("process parameters") on the ground level in the area of the face" wells. The process parameters include pressure and temperature. However, measurement of these properties can represent a significant technical problem. The placement of electronic equipment at the place of burial in the area of the well bottom is possible, but can be expensive and unreliable. Electronics often loses efficiency at high temperatures and pressures present in many wells. Space electronics in a sealed enclosure should protect electronic components from the effects of high pressures. High temperature or remove the batteries from the system or significantly reduce the battery life. Posting from the surface to power and transfer data which is expensive and unreliable.
 the Present invention results from the passive downhole measurement system process parameters of the fluid. In one configuration to the place of burial in the area of the bottom hole is created resonator parameter that has a resonance frequency that changes depending on the technological parameter of the downhole fluid. This resonance frequency can be measured using any suitable technique. In one example, the acoustic source on the surface or remote location sends acoustic energy into the borehole to a location within the area of the face. In another example, acoustic energy is generated in the borehole, for example, a flow of fluid in the well. Resonant acoustic signal from the resonator parameter is then passed to the surface. The resonant signal has a frequency component related to the resonance frequency of the resonator parameters. Acoustic sensor at a location on the surface takes the resonant signal. Electronic measuring circuit configured to measure a resonance signal, such as frequency or amplitude of the resonant signal and produce an output signal corresponding to the technological parameter of the downhole fluid. This configuration provides a measurement in real-time properties of the downhole fluid the environment during drilling, and during well operation.
 figure 1 is shown not to scale schematic cross-section of the wellbore. As an example, the barrel diameter is 40 inches (102 cm) drilled to a depth of 1,000 feet (305 m)and a trunk diameter of 16 inches (41 cm) drilled to a depth of 15,000 feet (4575 m). Steel pipe casing 12 with a diameter of 30 inches (76 cm) installed to a depth of 1,000 feet (305 m), and steel pipe casing 14 set to a depth of 15,000 ft (4575 m). Cement 16 is filled inside the casing on the bottom of the well (bottom). Within a casing then is pumped pressure, cement extrudes upward in the annular space between casing and borehole. Cement 16 hardens and seals the hole. Tube 20 is then installed inside the casing to the borehole bottom. The packer 22 is set at the bottom of the borehole between the pipe 20 and the casing 14. The space from the packer to the surface is filled nadakarni fluid 24 (for example, water or diesel fuel). The charges of the explosive 26 is then undermined at the installation site under the packer to create a passage through the casing and, for example, in the oil reservoir.
 As discussed above, the environment at the place of burial in the area of the well bottom can be very unfavorable. In the new wells, the pressure in the bottomhole zone may exceed 15000 function with the/in 2(105 MPa). If the well is not managed, it should be considered "outdoor fountain under high pressure, because the pressure in the bottomhole zone exceeds the hydrostatic pressure of about 4000 lb/in2(28 MPa). In addition, the temperature in the bottom-hole zone can exceed 375°F (191°C).
 the sensor on the place of burial in the area of the face is a serious technical problem. Very difficult is the transfer of information to the surface using wire, fiber optic cable, or wireless technologies such as radio frequency. Power power device from the surface can also be problematic, since it is necessary to lay a long wire. You can use stand-alone power sources such as batteries, but they must be able to work under difficult conditions. Self measuring device is also difficult to design, because it must withstand high pressure and temperature.
 the present invention uses the transmission of sound and characteristics of the acoustic signal to determine the parameter or process parameter of the downhole fluid, such as pressure or temperature. The speed of sound in gases, liquids and solids is, in General, predicted on the basis of the density of the material and pack the natives properties called the bulk modulus. Elastic properties of matter are determined by the amount of the substance, shrinking the amount of external pressure. The ratio of pressure change to the proportion of a volume compression ratio is called the bulk modulus of the material. A normal transmission rate of the acoustic signal (the speed of sound in various materials are as follows: in water the speed of sound propagation is 1482 m/s at 20°C, the oil velocity of propagation of sound is 1200 m/s in steel velocity of sound propagation is 4512 m/s, and in dry air speed distribution is 343 m/s at 20°C.
 the Response harmonic resonance is a phenomenon in which a passive body responds to external vibrations to which it bears a resemblance harmonics. This can be demonstrated by a simple example in which there are two similar tuning fork. One of the tuning forks mounted on a solid. If another tuning fork is struck and placed in contact with a solid body, the vibrations are transmitted through the body, and set the tuning fork should resonate. This example shows how to transfer and conservation of energy between the vibrational systems.
 figure 2 shows a simplified diagram of the transmitting tuning fork 50 and the receiving of the tuning fork 52, connected to the elongated body 54, which can please take the TB pipe for use in drilling. In this example, the tuning forks 50 and 52 are identical and are connected by a pipe 54, for example, by welding. If the transmitting tuning fork to hit 50, axial vibration "A" should cause simultaneous radial vibration "R". This acoustic wave must propagate along the pipe 54, causing the resonating receiving a tuning fork 52, as shown by the arrows "R" and "A". If the transmitting tuning fork 50 is suppressed, receiving the tuning fork 52 must continue to vibrate and cause the transmission of an acoustic wave back to the receiving fork 50, again causing resonance of the receiving fork 50.
 figure 3 shows a simplified block diagram of a variant of the invention, the system 100 downhole measurements in the well area, which includes the electronic circuit 102 measurement, connected with the bore 104, passing through the rock 108 to place 106 installed in the area of the bottom of the pipe 107. The resonator 110 parameter is set to the location 106 in the area of the well bottom and receives the acoustic signal 112 generated by the acoustic transducer 114. Acoustic transducer 114 includes an acoustic source 116 and the acoustic sensor 118.
 the Resonator 110 parameter receives the transmitted acoustic signal 112 and begins to resonate depending on the technological parameter of the fluid at the mo is polozhenii 106 in the area of the face. This causes the return of the reflected acoustic signal 122 along the length of the borehole pipe 107. Acoustic sensor 118 of the transducer receives the reflected acoustic signal 122. The electronic circuit 102 measurement is connected to the inverter 114. The electronic circuit 102 preferably includes a microprocessor 130, which is connected with the storage device 132, and the device 134 conclusion. D / a Converter 136 is connected with the microprocessor 130 and provides a digital output to the amplifier 138. Analog-to-digital Converter 140 receives the signal from amplifier 142 and generates a digital output signal to the microprocessor 130.
 During operation, in this embodiment, the microprocessor 130 generates acoustic transducer 114 acoustic signal 112, transmitting the digital signal in the digital to analog Converter 136. This produces an analog signal which is amplified by amplifier 138 and converted into an acoustic signal from an acoustic source 116. As described above, the resonator 110 parameter generates a reflected acoustic signal 122, which is received by the acoustic sensor 118 of the Converter 114. The sensor 118 transmits the analog signal to the amplifier 142, which passes the amplified signal to the analog-to-digital Converter 140. Analog-to-digital Converter 140 of provived amplified signal and transmits a digital output signal to the microprocessor 130. The microprocessor 130 operates according to the programs stored in the storage device 132, and is configured to generate the output signal using an electronic circuit 134 conclusion. The output signal shows the process parameters of the fluid at the location 106 in the area of the face. Information on the output of the electronic circuit 134 may be displayed, for example, on the local display or the local output device, or can be transmitted to a remote location using, for example, methods of wired or wireless connection. One example of a method of wireless communication is a two-wire loop process control, in which data transmission and the power transmitted on a single wire pair. For example, the current in the 4-20 mA output can be controlled in two lead wires of an electronic circuit 134 and to use to create the indication of the measured process parameters of the fluid. In another example, the digital information can be modulated on the two-wire loop. Two-wire path can connect to a local location, such as post management and control or the like, and also performed with the system power. Alternative different solutions for wireless communication can be used.
 According to one variant of implementation of the high performance embedded the SOR 130 is configured to generate an acoustic signal 112, changing the frequency range. By monitoring the reflected acoustic signal 122 peak in the reflected signal 122 can be identified relative to a specific frequency band of frequencies. This information can be correlated with the measured process parameter of the fluid at the location 106 in the area of the face. The resonator 110 can be performed according to any suitable technology, where the resonance frequency of the resonator 110 varies as a function of one or more parameters of the fluid. Examples include pressure, temperature, chemical composition, viscosity or other When used in this document, the term "acoustic" and "acoustic signal" refers to any type of vibration signal and is not limited to a specific frequency range.
 figure 4 shows a cross-section of the example resonator 200 option. The resonator 200 can be set on the place of burial 106 in the area of the well bottom and be used, as in this example, to measure temperature and pressure. In embodiment 4, the resonator 200 includes a sealed vacuumized volume 202, which has cantilever beams 204 and 206. Beam 204 is measuring the temperature of the cantilever beam and the beam 206 is measuring the pressure of the cantilever beam. For example, beam 204 may be bimetallists, when this temperature changes cause a change in voltage of the beam 204 and thereby changing the resonance frequency of the beam 204. Cantilever beam 206 includes an inner space 210, coupled with the process fluid medium outside vacuumized volume 202 through the opening 212. The pressure change process fluid must be due to the change in the voltage beam 206, this changes the resonance frequency of the beam 206. Preferably, the frequency bands of resonance beams 204 and 206 are spaced out enough so that their individual acoustic signature can be detected and divided into the surface.
 figure 5 shows a cross section of another variant example of implementation of the resonator 220 parameter, in which the resonant components are built into the walls of the tube 226. This configuration may be preferred, as it leaves the inner space of the tube 226 is free to transport the fluid. The resonator 220 parameter includes a vacuumized space 222 and 224, made in the walls 226. Space 224 carries measuring the temperature of the cantilever beam 230, and the space 222 carries measuring the pressure of the cantilever beam 232. As discussed above, beam 230 may include a bimetallic material with a resonance frequency that is dependent on temperature. Similarly, beam 232 VK is uchet in an internal space 236, United with the process fluid medium through the opening 234, and has a resonance frequency that changes depending on the pressure in the process fluid. Vacuumized volumes 222 and 224 may be located on the inner or outer diameter of the tube 226.
 In another example configuration, the elements 204, 206, 230 and 232, shown in Figure 4 and 5 contain the tuning forks instead of the cantilever beams. In some configurations, the tuning fork is preferred because it creates a more efficient design, in which the continuing resonance energy longer remains in the structure due to the constant center of mass.
 figure 6 shows a simplified tuning fork 250 that serves as a resonant component according to another example of the configuration of the present invention. The fork contains 250 section 252 of the plug connected to the leg 254. If the plug 250 is made of a bimetallic material, the resonance frequency of the fork 250 should vary depending on temperature. In another example configuration plug 250 includes an inner space of 256, which may be filled, for example, an insulating fluid medium, such as oil. Insulating aperture 258 is connected with the process fluid medium, as discussed above for components 206 and 232. When the process fluid exerts pressure on the insulation diaf the agmu 258, the pressure in the internal volume of 256 is changed, this changes the resonance frequency of the fork 250.
 In one configuration of the resonant component is located in a vacuumized volume to reduce any damping that may arise. The main resonance frequency of the tuning fork, which is a frequency in the absence of the application of pressure to the diaphragm 258, can be calculated using the following equation:
FF= The fundamental frequency = 432,4 Hz
K0= Constant = 3,52
Ri= Radius of the hole of the pipe = 4*10-3m
R0= Radius of the tube = 6*10-3m
L = Length of the leg of a tuning fork or = 1.5*10-1m
E = young's Modulus = 1,93*1011kg/MS2
ρ = Density = 8*103kg/m3 it is assumed that the tuning fork is made of stainless steel and the main frequency is 432,4 Hz.
 the resonance Frequency as function of pressure can be calculated using the following equation:
P = internal pressure in the fork.
 In many cases it is necessary to measure pressure or temperature without invasion into these vessels, such as pipes or tanks in the refining process or the process in chemical plant. The measurement of technological parameters of the traditional ways is AMI usually requires passage through the wall of the vessel. This passage can be costly and potentially unsafe in certain conditions, such as high pressure, high temperature, or processes of increased danger. Options for implementation, discussed above and shown Figure 3, 4, 5 and 6 for measurements in the area of the well bottom, are applicable to any such measurement, the blood vessels on the surface, such as pipes and tanks.
 Although the present invention is described for preferred embodiments, specialists in the art should understand that you can make changes in the forms and details without departing from the essence and scope of the invention. In one configuration, the place of burial "in the area of the bottom of a well", discussed above, is a place that is remote or otherwise separated from the electronic circuit measuring installed on location work.
1. The sensor system for measuring a process variable of the fluid at the downhole location, containing:
the resonator parameter, located in a downhole location, having a resonance frequency that varies depending on the technological parameter of the fluid, and the resonator parameters (110) forms a reflected acoustic signal at a resonance frequency, indicating technological parameter;
acoustic sensor, the positioning the location above the surface, spaced from the resonator parameter, and configured to receive the resonant acoustic signal transmitted from the resonator parameter;
a measuring circuit coupled to the acoustic sensor is configured to transmit the output signal of the technological parameter corresponding process parameter of a fluid medium, in response to the accepted resonant acoustic signal, and
the acoustic source is connected to the pipe at a location near above the surface and spaced apart from the resonator parameter, located in the downhole location, and configured to transmit an acoustic signal in the borehole location.
2. The device according to claim 1, in which the technological parameter of the fluid is the pressure.
3. The device according to claim 2, in which the resonator parameter includes an elongated element having an internal cavity.
4. The device according to claim 3, in which the internal cavity is connected with the pressure fluid.
5. The device according to p. 4, which includes an isolation diaphragm configured to isolate the internal space of the elongated element from a fluid medium.
6. The device according to claim 1, in which the technological parameter of the fluid is temperature.
7. The device according to claim 6, in which the resonator option with the contains elongated element, made of bimetallic material.
8. The device according to claim 1, in which the resonator parameter contains cantilever beam.
9. The device according to claim 1, in which the resonator parameter contains a tuning fork.
10. The device according to claim 1, in which the resonator parameter includes a resonating element that is isolated from the fluid.
11. The device according to claim 10, in which the resonant element is supported in a vacuumized space, isolated from the fluid.
12. The device according to claim 11, in which vacuumized space built into the wall of the pipe carrying the fluid.
13. The device according to claim 1, in which the resonator parameter resonates in response to the fluid flow.
14. The device according to claim 1, in which the resonator parameter includes multiple resonant elements, each configured to resonate at a different frequency range.
15. The device according to 14, in which the resonant elements are designed to measure various process parameters of the fluid.
16. The device according to claim 1, in which the fluid medium is a downhole fluid environment.
17. The device according to claim 1, in which the fluid medium is a process the fluid and the first location is a location in the industrial technological capacity is I.
18. A method of measuring a process variable of the fluid at the downhole location, containing:
urge rezoniruya resonator parameter that is installed in the borehole location, and the resonator parameter has a resonance frequency that changes depending on the technological parameter of the fluid;
in the reaction the formation of a resonant acoustic signal from the resonator parameter;
the reception resonant acoustic signal at a location near above the surface, spaced from the downhole location; and
determining a process variable of the fluid as a function of the received acoustic resonance signal, transmitting an acoustic signal from a location near above the surface to the downhole location.
19. The method according to p, in which the technological parameter of the fluid is the pressure.
20. The method according to p, in which the technological parameter of the fluid is temperature.
SUBSTANCE: method of determining rheological properties of non-Newtonian liquids involves passing a liquid through a capillary. The liquid is passed at different velocities through the capillary which is in form of an annular channel. Pressure fall at the ends of the capillary ΔP and volume-flow rate of the liquid Q are determined using the formula: where V is the volume of lubricant passing through the capillary in time (t) of one cycle of the experiment; d is the plunger diameter; S is the plunger displacement. Further, the dependency of tangential stress on the velocity gradient is calculated using the following formulas: where is the velocity gradient; τω is tangential stress; h is the thickness of the annular gap; R is the radius of the capillary; L is the length of the capillary, and the obtained data are used to plot a curve of the flow of the non-Newtonian liquid under analysis.
EFFECT: high accuracy of determining rheological properties of non-Newtonian liquids.
3 tbl, 3 dwg
FIELD: physics, measurement.
SUBSTANCE: invention is related to metering equipment and may be used in electric drop jet marking printers. Method for paint viscosity definition in electric drop jet marking device includes periodic supply of identical paint portions by pump for the time of pump suction and discharge into hydraulic load, measurement of average pressure Pav at pump discharge, stabilisation of specified pressure level by means of selection and measurement of pump action period duration Tpump required for that by means of control unit connected to pressure detector and pump drive, and paint viscosity ηpaint is defined according to formula ηpaint=K×Pav×Tpump.
EFFECT: higher accuracy, fast action and frequency of viscosity measurement.
3 cl, 3 dwg
FIELD: methods of determining parameters of molding of monolithic (free from air inclusions) nature item made of high-filled polymer composition.
SUBSTANCE: model composition is chosen and prepared. Flat transparent molding form is filled in, which form is made by cutting with transparent conditional volumetric model molding form being identical to tested one. Absence of air capsulation during process of filling of flat model molding form is achieved due to changing in viscosity and limit of fluidity of model composition, by changes in shape and sizes of input section and transient parts of molding form. Parameters of molding of nature item are assigned on base of received parameters of molding of monolithic flat model molding form.
EFFECT: high speed of determination of optimal parameters; high precision; minimal costs.
2 cl, 2 dwg
FIELD: investigating or analyzing materials.
SUBSTANCE: method comprises measuring the initial liquid column in the vessel and time of discharging of a given a given liquid volume through the cylindrical passage under the action of gravity, measuring, at least three times, the height of the liquid column in the vessel, measuring the inclination of the outlet cylinder of the passage, and calculating the viscosity from the formula proposed.
EFFECT: enhanced accuracy of determining.
FIELD: sugar industry, possible use for controlling viscosity of normal molasses.
SUBSTANCE: device includes batching gear pump for molasses, heat exchanger for heating the latter up to given temperature, provided with contour for adjusting aforementioned temperature, and thermo-isolated capillary made of non-corroding steel. The latter is connected by means of thermo-isolated branch pipes to probing gear pump and molasses pipeline. Device is provided with differential manometer, connected to input and output of capillary, and also with secondary device with indicators for registration of temperature and pressure of molasses at input and output of capillary.
EFFECT: increased precision of molasses viscosity estimation, increased speed of measuring process.
FIELD: mechanical engineering.
SUBSTANCE: device has housing provided with three cylinders made of a dielectric material. The housing receives the cylinder with a piston.
EFFECT: improved design.
FIELD: study and automatic monitoring of viscoplastic liquids.
SUBSTANCE: proposed method includes pumping the liquid through two similar capillaries made in form of circular passages of different length, determination of volumetric flow rate, pressure differential at capillary ends and viscosity and yield point.
EFFECT: enhanced accuracy of measurements; facilitated procedure of determination of viscosity and yield point.
FIELD: physics, acoustics.
SUBSTANCE: invention relates to oil and gas industry and can be used on fields with different structural types, including depleted fields and fields with hard to recover reserves. Seismoacoustic investigations during oil extraction include a downhole acoustic radiator generating elastic vibrations in the form of a cylindrical wave horizontally directed into a formation; using seismic detectors mounted on the earth's surface on a profile to detect and measure amplitude-frequency parameters of longitudinal and transverse waves propagating through the formation, said waves being caused by deformation of rocks by elastic vibrations of the downhole acoustic radiator; simultaneously with the seismoacoustic investigations, using the elastic vibrations of the downhole acoustic radiator to create a pressure gradient for displacing oil and extracting oil.
EFFECT: high accuracy of seismoacoustic investigations and higher oil recovery factor.
SUBSTANCE: method involves excitation of elastic vibrations by a vibration source in a well crossing hydraulic fracturing cracks, recording at receiving points at least in one neighbouring well of resonant vibrations emitted with a hydraulic fracturing crack system at excitation in drilling fluid of elastic vibrations, and determination of parameters of the crack system as per resonant vibrations occurring in the cracks. Excitation of vibrations in the well and their recording is performed before and after hydraulic fracturing. Besides, for each fixed source-receiver pair there formed is a difference seismic record of the records received before and after hydraulic fracturing; signals emitted by the crack system are separated on the difference seismic record, and parameters of cracks are determined as per the above signals.
EFFECT: improving reliable determination of spatial orientation of a hydraulic fracturing crack system and its dimensions.
SUBSTANCE: disclosed is a method of determining properties of a permeable formation, which involves creating three mathematical models of propagation of a low-frequency pressure pulse: in a well, in a formation and in a single well and formation system. The third model is used to determine the frequency range in which the coefficient of reflection of the low-frequency pressure pulse from the formation is sensitive to a formation property. At least one low-frequency pressure pulse is generated in the well and the resultant well response is detected by at least one sensor of a liquid parameter, measured in response to the low-frequency pressure pulse. By analysing response, reflection of the pressure pulse from the formation is detected in the well response; data obtained by simulation are compared with data obtained by detecting well response, and formation parameters in the third model are adjusted so that data obtained by simulation match data obtained by detection. Formation properties are defined as parameters which provide matching.
EFFECT: high accuracy of analysis data obtained during various well operations without stopping said operations.
16 cl, 10 dwg
SUBSTANCE: disclosed is a well seismic survey method which involves detecting seismic vibrations at receiving points lying in a fixed depth interval, exciting vibrations from excitation points lying in different azimuths from the projection on the earth's surface of the centre of the depth interval at distances from the projections that are comparable with the depth interval. Excitation and detection of vibrations is carried out before and after hydraulic fracturing in the depth interval. Detection of vibrations after hydraulic fracturing is carried out with a probe with tool determination of spatial orientation of seismic receivers contained therein. Vibration excitation points are installed on a circle, the centre of which is the projection of the centre of the depth interval on the earth's surface. Configuration of non-uniformity is determined from the azimuthal change in kinematic and dynamic seismic parameters determined in the depth interval before and after hydraulic fracturing.
EFFECT: high accuracy of determining the extent of a fractured zone lying in the vicinity of the investigated depth interval.
3 cl, 1 dwg
SUBSTANCE: disclosed is a rod-shaped piezoceramic acoustic pressure radiator with a one-sided beam pattern, having a housing made of steel in form of a pipe, an activating element consisting of a plurality of piezoceramic discs placed on a tension rod which is mounted in the housing, a radiating element with a truncated cylindrical shape, a damper placed at the end of the tension rod and rigidly attached to the housing and with one end of the activating element. The piezoceramic discs of the activating element are placed on an insulating layer which is deposited on the tension rod, and are merged in at least three sections. One end radiating end is inclined to the axis of the housing at an angle ranging from 90° to 15° to form a truncated cylinder. The piezoceramic acoustic pressure radiator has a reflecting element made of steel, which has the shape of a truncated cylinder, placed in the housing, one of end of which faces the activating element, and is inclined to the axis of the housing at an angle ranging from 15° to 75°. The invention also discloses a device and a method for full-waveform logging.
EFFECT: high accuracy of probing analysed objects.
11 cl, 18 dwg
FIELD: oil and gas industry.
SUBSTANCE: system includes a ground part in the form of a ground-mounted unit of a telemetric system of an electric-centrifugal pump installation and a well part including signal transfer medium of a combined communication channel, a submersible unit of the telemetric system of the electric centrifugal pump installation, an interface unit, receiving and independent transmitting and control modules and a measuring loop. The latter includes several measuring probes arranged one after another and parallel connected via a cable communication line connected to the independent transmitting and control module. The receiving module together with the interface unit and the submersible unit of the telemetric system is attached to the base of the submersible electric motor of the electric centrifugal pump installation. Information from the measuring loop is received with the independent module. Communication between independent and receiving modules is performed by means of a wireless acoustic channel. Then, measuring information is transmitted through the submersible unit via the combined communication channel to the ground-mounted unit of the telemetric system.
EFFECT: improving reliability of the data transfer system owing to preventing cable damage situations of the measuring loop and improving the efficiency of the monitoring process owing to decreasing complexity of lowering and lifting operations at erection and removal and excluding cases of tubing seizure with a geophysical cable.
SUBSTANCE: disclosed method involves drilling at least one observation well in the vicinity of a producing well which connects the storage with the surface. At least one seismic receiver which is in acoustic contact with rocks surrounding the observation well is placed in the observation well. Hydrocarbon pressure in the underground storage is periodically reduced and increased. The seismic receiver detects seismo-acoustic signals at successive steps of reducing and increasing pressure. The longest of the durations of the first half-waves of signals detected at the pressure reduction section and durations of the first half-waves of all signals at the pressure raising section are determined. The onset of cracks near the boundary of the storage, which are capable of destroying the storage, is determined from the onset of at least one seismo-acoustic signal. The destruction of the array of rocks around the storage is indicated by the duration of the first half-wave of such a seismo-acoustic signal at the pressure raising step being shorter than the longest of the durations of the first half-waves of signals detected at the pressure reduction step.
EFFECT: high reliability of predicting destruction of an array of rocks holding an underground storage of hydrocarbons.