Body of acoustic logging tool

FIELD: metering equipment.

SUBSTANCE: invention is related to survey of underground formations with application of acoustic measurements performed in well. For this purpose body of acoustic logging tool is made as configured for isolation of receiving elements and electronics in acoustic receiver unit against well environment. At the same time body has an interrupted, alternating structure, which acoustically non-transparent in some zones and acoustically transparent in the others. Body may be modular, with several steps joined one to another. Multiple steps provide for the body that may be used with multiple well logging tools for reduction or elimination of noise transfer to receiving elements.

EFFECT: improved efficiency of survey by elimination of interfering signals and provision of adequate mechanical strength of acoustic logging tool.

47 cl, 9 dwg

 

The technical field

The present invention relates primarily to methods of research of underground formations using acoustic measurements made in the borehole. More specifically, the present invention relates to a casing of an acoustic logging tool.

Prior art

The generation and recording of borehole acoustic waves is the primary measurement used in the oil fields for logging wells. Currently available many downhole tools and methods for conducting acoustic measurements. Some tools include one source of acoustic energy and two or more receivers; however, most of the tools contains many receivers arranged in a matrix. While the currently available tools are used to provide a wide range of information relating to the surrounding formation and borehole parameters, the main use of acoustic borehole measurements is to evaluate the formation slowness (the inverse of the speed of the wave). Usually measured in an acoustic field at frequencies in the range from 500 Hz to 25 kHz.

A compression or longitudinal wave slowness of the formation is usually estimated using the travel time obtained pore the process of motion detection. In the case of a tool with one source and two receivers, known from the prior art, the slowness of the formation is estimated by subtracting the travel time between the two receivers and dividing by the distance between the receivers. This estimate, however, may be inaccurate because of the tilt of the tool, blur wells, boundary effects, and so forth. Additional acoustic sources and receivers and more reliable methods, such as STC (Slowness-Time-Coherence analysis), are used to reduce the inaccuracies introduced by the effects of the environment.

One example of a known acoustic instrument shown in figure 1. The tool 100 dipole acoustic imaging (DSI) contains the block 102 processing and telemetry unit 104 acoustic receiver and the block 106 acoustic transmitter. Block 102 processing and telemetry may include a computer processor to control the execution of acoustic transmitters from block 106 acoustic transmitter, the reception wave measurement unit 104 acoustic receiver and communication with ground control devices and equipment.

As shown in figure 1, the block 104 acoustic receiver contains a matrix of individual acoustic receivers 108. Block 106 acoustic transmitter contains exclusive transmitter 110 and the upper and lower dipole transmit the IKI 112, 114, respectively. Exclusive transmitter 110 and the upper and lower dipole transmitters 112, 114, as well as sound receivers 108, facilitate compression and shear measurements through the adjacent formation. The tool 100 can operate in several modes of data collection to obtain different forms of waves. The modes may include upper and lower dipole modes, cross-dipole mode, stonley, P and S modes and the mode of the first entry.

However, a common problem associated with sound logging, is the distribution of generated signals along the tool 100. The signals propagating along the tool 100, commonly known as "entry tool" and are considered "noise"that can interfere with the detection of signals associated with the formation. In this regard, has been proposed several methods for eliminating or reducing the entry of the instrument. The most common approach to reducing the effects of the arrival of the tool is to insert an insulator between the block 106 of the transmitter and the power receiver 104 (Fig 1). The purpose of the isolator is to prevent, reduce and/or propagation delay of entry of the instrument. In accordance with Figure 1, the insulator is an insulating connection 116, further described in U.S. patent No. 4872825 and 5036945.

In addition, while offering the th logging is re-connection of signals from wells in the tool 100. Because of this reconnection is useful to construct weak and/or highly damped block, so that re-United the signals tool does not interact with the signal formation. The block 104 of the receiver comprises a slot housing 111, which functions as a slow-wave structure. Slotted casing 111 is additionally described in U.S. patent No. 4850450 and 6494288. Slotted casing 111 usually provides the mechanical strength required for acoustic logging, and reduces the entry of the instrument. However, it is very difficult or impossible to use slotted casing 111 and measure the slowness of the formation is greater than 700 Union/ft, especially while ensuring sufficient mechanical strength. In addition, some of borehole modes, such as mode stonley and compression (P) modes leak, are not sufficiently excited due to the rough surface of the slotted casing 111.

In the aperture of the housing 111 also usually placed and mechanically protected by a separate acoustic receivers 108 and associated electronics. And, despite the fact that slot chassis provides acoustic delay between the elements of the transmitter and receiver, it is also a source of harmful acoustic reflections and other unwanted secondary acoustic energy or noise from nearby priemnik is.

Undesirable secondary acoustic energy or noise generated mainly due to the intermittent patterns formed in the housing surrounding the receivers. An acoustic wave traveling along the winding path of the coating slot of the housing, form a reflected scattering patterns when faced with a change in the structure from intermittent slits to open rectangular Windows around or nearby receivers. Additional noise is generated in the primary enclosures due to "ringing" short cylindrical elements, which are slotted casing. The noise, in fact, because of the cover design of slotted casing, limiting their effectiveness, especially in the logging form a full wave in a wide frequency range.

Due to the fact that previous methods have not been entirely successful for eliminating interfering signals and to provide adequate mechanical strength, the present invention is directed to overcoming or at least reducing the effect of one or more of these problems.

A brief statement of the substance of the invention

The present invention aims at eliminating the above drawbacks. In particular, according to the invention, the proposed device for protection acoustic sensors, electronics, and/or other elements of the logging tool is ment and improvement of the acoustic properties of the logging tool. The present invention includes a housing with preferably intermittent, alternating structure that is acoustically opaque in some areas and acoustically transparent in others. The case can be modular, with multiple stages connected one to the other. Many steps make up the body, which can be used in various downhole logging tools.

In accordance with another embodiment of the proposed downhole device acoustic instrument containing block of the acoustic source and the acoustic unit of the receiver. The acoustic unit of the receiver contains the spindle and the outer casing, with alternating zones of high and low acoustic impedance. High and low acoustic impedance preferably differ in several times or more and can vary at least twice. The unit of acoustic receiver may include one or more acoustic receivers attached to the spindle and the closed outer housing. The receivers are preferably combined with one of the alternating zones of low resistance, which has an acoustic impedance, essentially corresponding to the borehole fluid.

In accordance with another embodiment includes the amount of oil located in the annular gap between the Central is owned by the spindle and an outer housing, this oil has the acoustic impedance, essentially corresponding to the resistance of the downhole fluid, and is intended to balance the hydrostatic pressure inside and outside of the outer case.

In accordance with the variants of the implementation receivers indirectly attached to the spindle through a set of massive blocks directly fastened around the spindle. Accordingly, massive blocks can have an inner diameter of the support surface equal to the diameter of the outer surface of the spindle for fixed landing. The spindle and the massive blocks can serve as a system of masses and springs and to serve as a lowpass filter to suppress arrivals tool, simplifying the frequency range of logging from 500 Hz to 25 kHz.

In accordance with other variants of implementation of the external enclosure contains many modules. Each of the set of modules includes a first hollow metallic cylinder, the first support ring located coaxially aligned and attached to the first hollow metal cylinder, the second supporting ring coaxial and offset axis relative to the first support ring, and a second hollow cylinder containing the elastomer, polymer or elastomer and polymer located between the first and second support rings.

In accordance with the var is a preferable implementation of the external housing includes an elastomeric or polymeric pipe, at least with two attached metal rings, with at least two metal rings are offset relative to each other. Metal rings are located in the docking groove along the inner surface of the polymeric pipe. It is possible that the metal rings were attached to and protrudes from the inner or outer surface of the polymeric pipe.

According to another aspect of the invention proposed probe acoustic receiver containing the spindle, many located at a distance from each other massive blocks, attached to the spindle, a lot of acoustic receivers placed at least on one of the many located at a distance from each other massive blocks, and the outer casing that covers the many located at a distance from each other massive blocks and acoustic receivers. The outer casing includes first and second zones, the first zone has an acoustic resistance of at least twice greater than that of the second zone. In accordance with some of the options for the implementation of the second zone is substantially acoustically transparent and axially aligned with the set of acoustic receivers.

In accordance with one implementation of the probe, the first and second zones contain alternating kalawy the continuous strip. The first zone is a metal strip, and the second zone includes an elastomeric band. For example, the first zone may be a steel strip, and the second zone may be a plastic strip. The outer surface of the outer casing, which includes the first and second zones is acoustically smooth relative to the wavelength of acoustic signals received by the sound receiver.

In accordance with another aspect of the probe, the outer casing contains many modules corps. Each module body may include a first hollow metallic cylinder, a second hollow cylinder containing the elastomer, polymer or elastomer and a polymer, and the first and second support rings. In accordance with other variants of execution of the probe, the outer casing is not modular and contains a polymer tube, at least two metal rings attached to it, and at least two metal rings are located at a distance relative to each other.

According to another aspect of the invention proposed by the Cabinet of the receiver, containing the first hollow metallic cylinder, the first support ring located coaxially aligned and attached to the first hollow metal cylinder, the second supporting ring coaxial and offset axis consider is Ino first support ring, and the second hollow cylinder containing the elastomer, polymer or elastomer and polymer located between the first and second support rings. The housing can further include a third hollow metal cylinder attached to the second support ring opposite the second hollow cylinder, the third support ring located coaxially aligned and attached to the third hollow metal cylinder, the fourth supporting ring coaxial and offset axis relative to the third support ring, and the fourth cylinder containing the elastomer, polymer or elastomer and polymer located between the first and second support rings. The second and fourth hollow cylinder preferably combined with acoustic receivers, the acoustic logging tool, and the first and third hollow metal cylinders, each has an acoustic impedance of at least two times greater than the second and fourth hollow cylinder.

According to the invention also offers the probe acoustic receiver containing a Central rigid spindle, many located at a distance from each other blocks receivers rigidly mounted around the spindle, a lot of acoustic receivers attached to each of the many located on the races is a being apart blocks of receivers, and many of axial intermittent continuous annular zones with alternating acoustic impedance, covering many located at a distance from each other blocks receivers and acoustic receivers. Zones with alternating acoustic impedance is different at least twice.

Brief description of drawings

Additional advantages and features of the invention set forth in the following description with reference to the accompanying drawings, in which:

Figure 1 depicts a vertical cross section of a known acoustic logging tool.

Figure 2 - Assembly of the acoustic logging tool according to the invention.

Figure 3 is a front view of a vertical cross section of the transmitting module of the tool in figure 2, according to the invention.

4 is a block receiver tool, with partially cut without elements of the receiver according to the invention.

5 is a block receiver tool, with partially cut with elements of the receiver are put in their places, according to the invention.

Figa - cross-section of one side of the receiver unit of the tool according to the invention.

Figw - cross-section of one side of the receiver unit of the acoustic tool in accordance with another embodiment of the invention.

Figa is a front view of the massive BL is ka, used in the receiver unit according to the invention.

FIGU is a cross section of a massive block according to the invention.

Detailed description of preferred embodiments of the invention

According to the present invention proposed an acoustic logging device with probes receivers having high tensile strength, compression and torsion. Probes receivers are designed to improve the acoustic properties of the device compared with conventional blocks receivers. In this regard, the device may include a housing that protects the sensitive elements of the logging device from downhole environments and reduces or eliminates the transmission of noise on acoustic receivers. The housing may provide alternating zones with different acoustic impedance to reduce or eliminate noise. The proposed device facilitates acoustic logging on a range of acoustic frequencies and all used acoustic modes, including monopole and dipole modes, the mode stonley, pseudorelevance mode and compression mode leak.

The term "spindle" is used to characterize the shaft, rod or axle, on which is mounted a working tool or elements of the working tool. The term "sound" refers to acoustic or sound waves having a range which zones of frequencies from about 500 Hz to 25 kHz. The term "acoustic impedance determines the product of density and seismic velocity, usually denoted as Z. the Acoustic resistance of many materials is volumetrically averaged for different materials. "Acoustic transparency is the quality of the environment, the acoustic impedance which is substantially constant throughout. Based on this "acoustically transparent" environment, as used below, may include the environment, the acoustic impedance which is the same or essentially the same as the acoustic impedance of the downhole fluid. Similarly, the term "acoustically opaque environment characterizes the medium with acoustic impedance, essentially different from the acoustic impedance of the downhole fluids. The terms "elastomer" and "elastomeric" refer to any of various polymers that have properties similar to rubber, and also include plastics. The term "plastic" refers to any of various organic compounds produced by polymerization. The terms "high" and "low" are relative indicators and not necessarily limited to any quantitative range.

Figure 2 presents the device downhole acoustic tool, for example, the acoustic logging tool 118, the according to the present invention. Like many acoustic instruments, acoustic logging tool 118 is used for logging wells by performing various wave measurements and transfer the measurements to the surface. Acoustic logging tool 118 contains the block 120 acoustic transmitter, which includes electronics and control circuits for acoustic sources. Block 120 acoustic transmitter described in more detail below with reference to Figure 3 and serves as a source of acoustic energy. Block 120 acoustic transmitter may include a clamp 122 and the diverter 124.

Block 126 separator connected to the block 120 acoustic transmitter above block 120 acoustic transmitter. Block 126 separator may have parts with different lengths, two of which are shown in figure 2, the long part a and a short portion 126b. Block length 126 of the separator can be selected in accordance with the expected acoustic behavior of the formation, wherein the well logging.

Block 126 separator connected to the top end to block the acoustic receiver or transmitter 128. In accordance with the described embodiment the probe 128 acoustic receiver may include a receiver unit 130 of the near monopoly of the transmitter, the compensator 132 volume of oil and block 134 electronics of the probe of the receiver, which contains a couple of ELAST the dimensional diverters or spacers 136. The receiver unit 130 of the near monopoly of the transmitter closed outer housing 138, which is described in more detail below with reference to Figure 4-6B.

Block 134 electronics of the probe receiver is connected to the top end to the compensator 132 of oil volume and may include front power sources and increase the transducers (not shown) for exclusive sources. Wire 140 is designed to facilitate the transfer of energy and of interactions between different sections of the probe 130 of the receiver. The first or upper end 142 of the probe 130 of the receiver can also include a connector 144 for connection with the main unit 146 electronics. Main unit 146 electronics may include a clamp 148 and standard connectors 150, which facilitate the connection and transfer of energy between the other instruments in the column of the logging tool or telemetry unit, which can communicate with the ground system through a wired cable or other communication interface.

Acoustic logging tool 118 preferably contains a block 120, which is shown in more detail in figure 3. Block 120 of the transmitter module contains 152 electronics, the compensator 154 of oil volume and the acoustic source. The acoustic source includes a first dipole source 156, a second dipole source 158 and exclusive source 160. The dipole source is key 156, 158 may contain the sources described in U.S. patent No. 6474439, or other dipole sources. Exclusive source 160 may contain a source described in U.S. patent No. 5036945, or other exclusive source. Block 120 of the transmitter also contains a wire 162 to facilitate the supply and transfer in and out of the block 120 of the transmitter or other elements of an acoustic logging tool 118 (Figure 2).

Figure 4 depicts the cross section of the probe 128 receiver (without any elements of the receiver for clarity). The probe 128 of the receiver contains the spindle for providing tensile strength, compression and torsion. The spindle is rigid Central titanium shaft 164 with an internal orifice 166. The Central titanium shaft 164 may also contain other hard materials. Internal penetration hole 166 may be provided with a conduit to facilitate the transfer of energy and/or communication between the probe 128 of the receiver and the surface.

Despite the fact that the Central titanium shaft 164 provides strength to the probe 128 of the receiver, it also provides an undesirable environment for the propagation of acoustic waves. To reduce, eliminate, a clear distinction arrival of the tool through the Central titanium shaft 164, the Central titanium shaft 164 has plenty of massive blocks. In accordance with the described variants of the MD implementation of massive blocks contain blocks 168 receivers. Blocks 168 receivers described in more detail below with reference to Figa-7V. Preferably, the blocks 168 receivers contain a metal, such as steel. The geometry of the Central titanium shaft blocks 164 and 168 receivers along with the material properties of each of them (for example, young's modulus, Poisson's ratio, and density) modify the wave propagation along the Central titanium shaft 164 so that the entry of the instrument are eliminated or easily identified and filtered. Blocks 168 receivers preferably rigidly attached to the Central titanium shaft 164 to the interference fit of a welded joint or otherwise rigid fastening. For example, the blocks 168 receivers can have an internal diameter that is nominally smaller than the outer diameter of the Central titanium shaft 164. Blocks 168 receivers can be heated to expand the inner diameter, placed on the Central titanium shaft 164, and then left to cool so that the inner diameter tightly to the outer diameter of the Central titanium shaft 164 in tightness. Separators 126 (Figure 2) may also have an identical configuration that includes a spindle and a set of massive blocks.

Blocks 168 receivers are separated from one another by a given distance, which is preferably accurately adjusted. In accordance with the other options implementation the accuracy of the distance between the blocks 168 receivers is of the order of 0.0001 meters are divided blocks 168 receivers provide a constant distance between the receivers and also provide Flexural strength. In this regard, if the probe 128 receiver starts to bend, for example, if he goes through deviating the borehole, the distance between adjacent blocks 168 receivers decreases up until the blocks will not come in contact with. On this basis, the bending stiffness increases with contact blocks 168 receivers to prevent the deformation of the probe 128 of the receiver.

Each of the blocks 168 receivers includes one or more mounting supports 170 receivers for installation of acoustic receivers 172 (Figure 5). Mounting supports 170 receivers can be made of polymer and/or elastomer. One or more mounting supports 170 receivers carries an annular matrix of acoustic receivers 172 located around its outer side. Acoustic receivers 172 are preferably in direct contact with the elastomer mounting supports 170 receivers. Attaching acoustic receivers 172 to the blocks 168 receivers through the elastomer mounting supports 170 receivers minimizes the generation of a voltage between the acoustic receivers 172 and mounting supports 170 receivers, which also provides resistance to mechanical shock and vibration. Electronics 174 probe receiver placed and installed in the cavities 174 (Figure 4)formed by two adjacent blocks 168 receivers.

In accordance with the described embodiment one diametrically located a pair of elements 172 receivers in each socket or block 168 receiver combined by rotation with a corresponding one of the dipole sources 156, 158 (Fig 3). In the described embodiment, there are eight receiving elements 172 in one or more mounting supports 170. However, specialists in the art it is clear that the number of nests receivers and elements 172 receivers on one slot may be changed in accordance with the requirements and preferences.

Elements 172 of the receiver are preferably piezoelectric pressure sensors, such as piezoelectric cylinder with end caps connected by means of a screw passing through the cylinder. The receiving elements 172 also contain polarized package of the piezoelectric plates attached to one another using fasteners or separated from one another by means of electrodes. Can be used in other embodiments of the receiving elements 172.

The receiving elements 172 and electronics 174 probe receiver is isolated from the downhole environments using external housing 178. The ring is Azor between the Central titanium shaft 164 and an outer housing 178 may be filled with oil, preferably has an acoustic impedance that is essentially comparable with the downhole fluid, and intended for equalization of hydrostatic pressure inside and outside of the outer casing 178.

The outer casing 178 has two or more alternating zones 180, 182 with high and low acoustic impedance. In accordance with some of the options for the implementation of the zone 180 with high acoustic impedance has an acoustic impedance of at least two times greater than the zone 182 with low acoustic impedance. Preferably, the acoustic impedance zones 180 with high acoustic impedance, at least, five times more in comparison with zones 182 with low acoustic impedance. More preferably, the acoustic impedance zones 180 with high acoustic impedance at least ten times more in comparison with zones 182 with low acoustic impedance. Although figure 4-5 shows a lot of alternating zones 180, 182, these zones can only alternate between one zone 180 with high acoustic impedance and area 182 with low acoustic impedance.

Zone 180, 182 with high and low acoustic impedance may contain alternating stripes or blocks of high and low acoustic impedance. For example, first, the WTO is the second and third blocks 184, 186, 188 may each have a high acoustic impedance, and the fourth band 190 may have a low acoustic impedance. In accordance with the shown embodiment striped blocks are continuous around the circumference, but axially interrupted at the boundary between the first and fourth blocks 184, 190.

In accordance with the embodiment shown in Figure 4-6A, the outer casing 178 contains many modules, each of which contains four repeating unit 184, 186, 188, 190. Four recurring unit 184, 186, 188, 190 best shown in Figa. Repeated blocks 184, 186, 188, 190 are removable, so that each of them can be replaced or undergo repairs during periodic maintenance or repair of the acoustic logging tool 118 (Figure 2). The first block 184 preferably includes a first hollow metal cylinder located coaxially with the Central titanium shaft 164. The first block 184 abuts the end face and is attached to the second block 186. The second block 186 contains the first supporting ring coaxial with the first block 184. The third block 188 is also supporting ring and is coaxial with the first and second blocks 184, 186. However, the third block axially offset from the second block 186. The second and third blocks 186, 188 are FAV is preferably metal. The fourth block 190 is the second hollow cylinder placed between supported and placed coaxially with the second and third blocks 186, 188. The fourth block 190 is preferably non-metallic and may be made of elastomer, polymer, or elastomer and polymer, depending on the slowness of the target formation. The outer surface of each block 184, 186, 188, 190 is essentially smooth relative to each other and has no sharp differences in the diameter of greater than about 5.0 mm, Based on this, the outer surface of the outer housing 178 is acoustically smooth, where smoothness is the change in radius along the longitudinal axis of the probe 128 of the receiver relative to the wavelength or the annular gap between the outer housing 178 and the borehole wall. Acoustically smooth outer surface of the outer housing 178 reduces the interference between the probe 128 of the receiver and the fluid-contact modes, such as the compression mode, leakage mode stonley for exclusive logging, bending dipole mode for logging.

The fourth block 190 is used as an acoustically transparent window for acoustic receivers 172. Based on this, the fourth block 190 is axially aligned with the mounting supports or sockets 170 and, therefore, with acoustic receivers 172. A pair of split rings can be used is as to ensure proper alignment. For example, the locking ring 192 is used in accordance with the described embodiment for the location of the outer housing relative to the Central titanium shaft 164. In addition, the O-ring 193 centers external enclosure 178 relative to the Central titanium shaft 164. Split rings can be placed in a groove in the first block 184 and/or in blocks 168 receivers to ensure axial and azimuthal alignment of the outer surface 178 with the Central titanium shaft 164 and, thus, with the acoustic receivers 172. The fourth block 190 has an acoustic impedance similar to the well fluid and the oil in the annular gap 179 to be acoustically transparent. The fourth block 190 may also be elastic to facilitate the transfer of acoustic energy from the borehole fluid to the oil ring gap 179. Specialists in the art can construct an acoustically transparent fourth blocks 190 by matching acoustic impedance of the fourth block 190 with the acoustic resistance of the downhole fluid. The shear modulus and geometry are key parameters for the design of the fourth block 190 and can vary from one downhole application to another, but the construction of the fourth unit 190 is, however, a standard procedure for specialists in this on the region of the technique. The acoustic impedance of the polymer, elastomer and borehole fluid is usually in the range of about 1-3 Mrayl.

On the other hand, the first block 184, made of metal, has a high acoustic impedance, which may be in the range from 27 to 46 Mrayl. The first block 184 is acoustically opaque and contains a screen or filter that isolates the acoustic receivers 172 from the acoustic noise generated by, for example, in the cavities 176 (Figure 4), containing the electronics 174 probe receiver, and the annular gap between 181 blocks 168 receivers and the Central titanium shaft 164. The first block 184 also reduces the interference between the cavities of the tool and modes of stonley waves, excited in open environments. Additionally, by connecting the fourth block 190 having a low acoustic impedance, with the first block 184, having a high acoustic impedance (using the second and third blocks 184, 186 (5), the outer casing 178 prevents continuous propagation of acoustic waves along the longitudinal axis of the probe 128 receiver by scattering of acoustic waves at the boundaries or interfaces.

As shown in Figure 4-6A, the sequence of four blocks 184, 186, 188, 190 may be repeated any number of times for education modular external enclosure 178 May be used by third hollow metal cylinder, the third and fourth support ring and the fourth hollow cylinder made of elastomer and/or polymer, and so forth. Despite the fact that the outer casing 178 shown in Figure 4-6A as a combination of four repeating blocks 184, 186, 188, 190, can be used in other embodiments of the outer housing 178. For example, on FIGU shows a cross section of one side of an alternative external housing 278. The outer casing 278 contains one elastomeric and/or polymeric pipe 294, at least, with two metal rings 296 attached to it. In some embodiments, the implementation of the metal ring 296 contain steel. Metal rings 296 are recessed in the inner surface 298 of the pipe 294 to a distance above and below the alignment of the receiver (shown by line 299). Alternatively, a metal ring 296 can be extended and can be glued as a protrusion on the outer surface 297. Metal rings 296 can also be recessed into the inner surface 297. If the metal ring 296 is configured to protrude from the outer surface 297, limiting the thickness of the rings 296 less than 5.0 mm, and preferably in the range from 2.0 to 3.0 mm, which will provide acoustically smooth surface. Pipe 294, thus, provides the area with low acoustic impedance in all months is Oh, different from the places occupied by the metal rings 296. Additionally, the surface boundary between the metal rings 296 and pipe 294 prevents the propagation of acoustic waves.

On Figa-7B shows a more detailed front view and cross section of a variant of implementation of the blocks 168 receivers. Blocks 168 receivers contain tubular housing 169, having a through hole 171. Hole 171 is a step 173 where the hole 171 is reduced in diameter and is adjacent to the outer surface of the Central titanium shaft 164 (Figure 4), when it is mounted on it. Pair located at a distance from each other of the protruding ribs 175 form a cavity 177 to install the receiver. Other blocks of receivers can be used in accordance with the principles of the present invention, as well as the acoustic logging tool.

The preceding description has been presented only to illustrate and describe the invention. It does not limit the invention. The scope of invention is defined by the following claims.

1. Downhole acoustic tool containing the acoustic source,
the acoustic unit of the receiver, containing
the Central spindle,
and the outer casing, configured to isolate the receiving elements and the electronics unit of the acoustic receiver from the environment and the surrounding environment of the borehole, the external body has alternating zones of high and low acoustic impedance, with high and low acoustic impedance are different, at least twice.

2. The tool according to claim 1, characterized in that it further comprises one or more acoustic receivers attached to the spindle and placed in an external enclosure.

3. The tool according to claim 1, characterized in that it further contains oil, placed in the annular gap between the Central spindle and an outer housing, and the oil has an acoustic impedance corresponding to the borehole fluid.

4. The tool according to claim 3, characterized in that the oil is under pressure corresponding to the pressure of the downhole environment.

5. The tool according to claim 1, characterized in that the alternating zones contain strips having different acoustic impedance.

6. The tool according to claim 5, characterized in that the strips contain a separate, annular continuous strip.

7. The tool according to claim 1, characterized in that the alternating zones contain many continuous annular, axially discontinuous bands.

8. The tool according to claim 1, characterized in that the high and low acoustic impedance varies in 5 times.

9. The tool according to claim 1, characterized in that the high and low acoustic impedance varies in 1 time.

10. The tool according to claim 2, characterized in that each zone with low acoustic impedance axially aligned with the one or more acoustic receivers.

11. The tool according to claim 1, characterized in that each zone with low acoustic impedance is the acoustic impedance, essentially corresponding to the acoustic resistance of the downhole fluid.

12. The tool according to claim 1, characterized in that the outer surface of the outer casing is acoustically smooth.

13. The tool according to claim 1, characterized in that the spindle is hollow and forms a conduit.

14. The tool according to claim 1, characterized in that it further comprises a set of massive blocks, attached to the spindle, and one or more acoustic receivers attached to a massive blocks.

15. The tool according to claim 1, characterized in that the massive blocks have an internal diameter closely adjacent to the outer diameter of the spindle tension.

16. The tool according to claim 1, characterized in that the outer casing contains many modules, with each module contains
the first hollow metallic cylinder,
the first supporting ring coaxial with and attached to the first hollow metal cylinder,
the second supporting ring coaxial with the first supporting ring and axially spaced considers the flax of the first support ring,
the second hollow cylinder containing the elastomer, polymer or elastomer and the polymer is placed between the first and second support rings.

17. The tool according to item 16, wherein the outer casing includes a polymeric tube, at least two metal rings attached to it, with at least two metal rings are at a distance from each other.

18. Tool 17, wherein the at least two metal rings are located in the connecting grooves along the inner surface of the polymeric pipe.

19. Tool 17, wherein the at least two metal rings glued and protrude from the inner surface of the polymeric pipe.

20. The tool according to item 16, wherein the outer casing includes an elastomeric tube, at least two metal rings attached to it, with at least two metal rings are at a distance from each other.

21. The tool according to item 16, wherein the first and second cylinders are detachable for maintenance and repair.

22. Probe acoustic receiver that contains
spindle
many are located at a distance from each other massive blocks, attached to the spindle,
a lot of acoustic receivers, hence, is her least in one of the many located at a distance from each other massive blocks
the outer casing that covers the many located at a distance from each other massive blocks and acoustic receivers and is designed to isolate the massive blocks and acoustic receivers from the environment of the borehole, while the outer casing includes first and second zones, the first zone has an acoustic impedance of at least two times higher than the acoustic impedance of the second zone.

23. Probe acoustic receiver according to item 22, wherein the first zone has an acoustic resistance is five times greater than the acoustic impedance of the second zone.

24. Probe acoustic receiver according to item 22, wherein the first zone has an acoustic resistance ten times greater than the acoustic impedance of the second zone.

25. Probe acoustic receiver according to item 22, wherein the second zone is substantially acoustically transparent.

26. Probe acoustic receiver according to item 22, wherein the second zone is axially aligned with the set of acoustic receivers.

27. Probe acoustic receiver according to article 22, characterized in that it further comprises a set of alternating first and second zones.

28. Probe acoustic receiver according to item 27, characterized those who, what a lot of acoustic receivers placed at least two located at a distance from each other massive blocks, each of the multiple acoustic receivers axially aligned with one of the second zones.

29. Probe acoustic receiver according to item 22, wherein the first and second zones contain alternating annular continuous strip.

30. Probe acoustic receiver according to clause 29, wherein the first zone contains the metal strip and the second zone contains an elastomeric strip.

31. Probe acoustic receiver according to item 30, wherein the metal and elastomeric strips are removable for maintenance and repair.

32. Probe acoustic receiver p, wherein the first zone contains the steel strip, and the second zone contains a plastic band.

33. Probe acoustic receiver according to item 30, wherein the external surface of the outer casing is acoustically smooth relative to the wavelength of acoustic signals received by the acoustic receivers.

34. Probe acoustic receiver according to item 22, wherein the outer casing contains a lot of hull modules.

35. Probe acoustic receiver 34, wherein each of the housing modules contains
the first hollow metallic cylinder,
the second p is large metal cylinder, containing elastomer, polymer or elastomer and polymer
the first and second support rings.

36. Probe acoustic receiver according to item 22, wherein the outer casing includes a polymeric tube, at least two metal rings attached to it, with at least two metal rings are at a distance from each other.

37. The enclosure of the receiver, containing the first hollow metallic cylinder,
the first supporting ring coaxial with and attached to the first hollow metal cylinder,
the second supporting ring coaxial with the first supporting ring and axially displaced relative to the first support ring,
the second hollow cylinder is placed as a layer between the first and second support rings and having an acoustic impedance that matches the acoustic impedance of the downhole fluid,
in this case the acoustic receiver configured to accommodate the acoustic receivers, the acoustic logging tool and isolate the acoustic receivers from the environment of the well.

38. The body acoustic receiver according to clause 37, characterized in that it further contains
the third hollow metal cylinder attached to the second supporting ring naproti the second hollow cylinder,
the third supporting ring coaxial with and attached to the third hollow metal cylinder,
the fourth supporting ring coaxial with the third support ring and axially spaced from the third support ring,
and the fourth cylinder containing the elastomer, polymer or elastomer and polymer located between the third and fourth supporting rings.

39. The body acoustic receiver according to 38, characterized in that the second and fourth hollow cylinders combined with acoustic receivers, the acoustic logging tool.

40. The body acoustic receiver according to 38, characterized in that the first and third hollow metal cylinders, each has an acoustic impedance of at least two times greater than the acoustic impedance of the second and fourth hollow cylinder.

41. The body acoustic receiver according to 38, characterized in that the first and third hollow metal cylinders, each has the acoustic impedance at least ten times greater than the acoustic impedance of the second and fourth hollow cylinder.

42. The body acoustic receiver according to clause 37, wherein the second hollow cylinder contains an elastomer, polymer or elastomer and a polymer.

43. Probe acoustic receiver, with whom containing a series of
the Central rigid spindle,
many are located at a distance from each other blocks receivers rigidly attached to the spindle,
a lot of acoustic receivers attached to each of the many located at a distance from each other blocks receivers
many of axial intermittent, continuous annular zones of acoustic impedance, covering many located at a distance from each other blocks receivers and acoustic receivers to isolate blocks of receivers and acoustic receivers from the environment of the well.

44. Probe acoustic receiver according to item 43, wherein the alternating zones differ in acoustic impedance at least twice.

45. Probe acoustic receiver according to item 43, wherein the alternating zones of different acoustic impedance, at least, five times.

46. Probe acoustic receiver according to item 43, wherein the alternating zones contain steel and elastomeric rings.

47. Probe acoustic receiver according to item 43, wherein the alternating zones contain steel and polymer rings.



 

Same patents:

FIELD: mining.

SUBSTANCE: invention can be implemented for acoustic logging during drilling. The essence of the invention is as follows: an installation for performing acoustic survey during borehole drilling consists of a facility extended in lengthwise direction; the facility is delivered into a borehole on a drilling tube; also the facility and the drilling tube have lengthwise channels; drilling agent flows through the said channels; further, the installation consists of an acoustic emitter supported with the said facility and designed for generating acoustic signals in the facility, in the borehole and in rock thickness; the installation consists of an acoustic receiver supported with the said facility and assembled at a distance from the emitter; the receiver is designed to receive acoustic signals; the installation also consists of an attenuator located in the facility between the acoustic emitter and the acoustic receiver and designed to attenuate acoustic signals in the facility within limits of a preliminary specified frequency range; the attenuator includes a tubular element out of a composite material having mainly cylinder external surface with a group of bodies of certain weight and length rigidly secured on the surface and arranged at a preset interval.

EFFECT: upgraded accuracy of positioning of drilling rig relative to boundaries of deposit formations.

16 cl, 17 dwg

FIELD: mining; oil and gas industry.

SUBSTANCE: invention refers to facilities for excitation of elastic waves in wells and is designed for cross-well seismic survey of rock at oil and gas deposits and also for cleaning filters of oil and water intake wells from mud. The facility consists of a current pulse generator, of a coaxial cable, of an electric-mechanical converter in form of an inductance coil assembled on a cylinder frame fabricated out of electric insulating material and of a metallic hammer. Also the inductance coil has a cylinder shape and is wound on the frame coaxially to the hammer, while the metallic hammer is made in form of a tube coaxially arranged outside the inductance coil and divided along a moving line into several sections connected between them with elastic elements.

EFFECT: upgraded mechanical strength and reliability of the facility, also increased amplitude and power of seismic pulse.

3 dwg

FIELD: mining.

SUBSTANCE: object of invention is method and device for communicating well apparatus avoiding laying communication via above ground module. The invention can be implemented at collecting data from underground formations. Information sent by well apparatus is surveyed and registered in a well. If information is designed for other well apparatus, information is copied into a descending communicating line and transmitted to a concrete specified device, group of devices or to all devices.

EFFECT: essential decrease of waiting time between command and response action.

47 cl, 10 dwg

FIELD: physics; mining.

SUBSTANCE: acoustic isolator for attenuation of acoustic signals propagating over well instrument includes several U-shaped links with two lug sets on each link. Also isolator includes several intermediary elements with crossed joint link points, positioned between interacting lug sets. U-shaped links are connected to intermediary elements by connection pins maintaining restricted bend yielding of isolator. Isolator can be made of metal and/or composite materials. Device of acoustic survey for mineral rock around a well includes hollow element reaching explored rock over well shaft, emitter mounted in the hollow element, receiver mounted in the hollow element at some distance from emitter, and acoustic isolator. Acoustic survey method for mineral rock around well shaft involves putting hollow element with emitter and receiver mounted at some distance from each other into well shaft, excitation of acoustic wave source in the emitter to generate acoustic signals, attenuation of acoustic signals passing over hollow element from emitter to receiver by acoustic isolator mounted in the hollow element between emitter and receiver, reception of signals transmitted through rock and acoustic isolator by receiver mounted at the acoustic isolator side opposite to emitter.

EFFECT: stable distance between logging instrument emitter and receiver in axial and circular direction.

19 cl, 5 dwg

FIELD: oil and gas industry, particularly well survey, namely acoustic borehole logging.

SUBSTANCE: method involves lowering electroacoustic transducer unit in borehole; initiating elastic vibrations in well by means of elastic wave source and recording the elastic vibrations by receivers; installing deflectors from both sides of electroacoustic transducer unit and performing acoustic borehole logging. Reflected surface acoustic waves are recorded by electroacoustic transducer unit movement along borehole along with reflectors.

EFFECT: increased accuracy of surface acoustic wave characteristics determination.

1 dwg

Seismic well probe // 2305299

FIELD: engineering of devices for recording seismic oscillations.

SUBSTANCE: in accordance to the invention, the probe consists of two or more modules, one of which is the force module, and the rest are receiving modules. All modules are positioned within hermetic bodies, which are interconnected by a strong flexible cable, connection line and a tubing. In the body of the force module, electronic block, electric drive, screw couple, rod of which is connected to forcing piston, are positioned. In bodies of receiving modules, sensors, two executive and two compensating pistons are positioned. Space between executive pistons is filled with non-compressible liquid.

EFFECT: increased precision of results, expanded functional capabilities.

4 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: device has set of coaxially placed piezoceramic converters, connected to each other through mounting parts and fixed together by centering rod, pressurizing elastic cover with two end lids, filled with electro-isolating liquid. Each piezoceramic converter has shape of correct straight polyhedral prism, sides of which are made in form of piezoceramic plates. Connection of piezoceramic plates to mounting part is made with possible realization by piezoceramic plates of resilient transverse oscillations. Inner volumes of piezoceramic converters and volume, formed by their outer surface and elastic cover, have hydrodynamic connection.

EFFECT: higher efficiency.

3 cl, 8 dwg

The invention relates to the field of downhole seismic survey and is intended for measurements of parameters of seismic waves in a borehole

The invention relates to the field of downhole seismic

The invention relates to petroleum Geophysics and can be used for surveys of inclined and horizontal wells

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil industry and can be implemented at survey of wells. The method of evaluation of static and dynamic levels of fluid in annular space of a well equipped with an electric centrifugal pump includes evaluating of levels by geo-physic methods. Prior to evaluation of levels a hole is made in a face plate. A perforated plastic pipe narrowed in its lower part and secured on external surface of a flow string is lowered together with the flow string and the pump into the well. Bottom of the plastic pipe is arranged 0.5-1.0 m above the pump; an upper end of the plastic pipe comes out to surface through the hole in the face plate. A gap between the plastic pipe and the hole of the face plate is leak proofed; a measuring tape with a level sensor is lowered inside the plastic pipe. Surface of fluid is contacted; a level is measured and the measuring tape is withdrawn out of the plastic pipe.

EFFECT: simplification of measuring procedure of fluid level.

FIELD: mining.

SUBSTANCE: invention relates to mining and is provided predominately for subsurface video surveillance, particularly for implementation of visual verification and automated flaw detection of condition of boreholes. Device for video surveillance of well includes sealed outboard unit with video camera and hermetic enclosure, which contains lamp, unit of secondary current supply, remote sensing unit, unit of input and sealing of hoist cable and electric signals converter. Additionally outboard unit additionally contains radiator, linked to environment, heat-conducting container, into which it is placed video camera and coolant, based on the Peltier effect.

EFFECT: providing the ability of video surveillance of boreholes in conditions of elevated temperature.

2 cl, 1 dwg

FIELD: oil industry.

SUBSTANCE: system consists of upper cable plug (UCP) and lower cable plug (LCP) and a body. At that, UCP is provided with cable cords (CC) uniformly located in a circumferential direction and covered with an insulation material, and plugs without being insulated are installed on CC ends. Body is provided with CC uniformly located therein in a circumferential direction, on top ends of which there installed without insulation and located in the body cavity are tips, and with a gasket with holes for CC. At that, LCP is provided with CC covered with insulation material and uniformly located in a circumferential direction and with a flange wherein two holes for mounting elements are made. In UCP and LCP body insulators with holes for CC are located. Seal rings are located in the joints between UCP and the body along the mating cylindrical surfaces. Body and LCP are provided with seal rings located on their external surface, and UCP is provided with a flange with two holes for mounting elements. Body is made in the form of a shell inside which insulators are located with CC uniformly located in a circumferential direction and equipped with limit stops preventing their axial movement. At the shell bottom there made are holes for CC covered with insulation material for LCP and coaxial relative to CC located in the body. Upper part of the shell is made in the form of a hollow cylindrical sleeve coming out of the flange provided with two holes for attaching the mounting elements and coaxial relative to the holes made on UCP flange. Gasket is located in the upper part of the body and locks insulators, and its holes are made for CC covered with insulation material for UCP and are coaxial relative to CC located in the body, on lower ends of which the tips are installed without insulation. Plugs without LCP insulation are installed on CC ends. Tips are collet-type and are provided with spring rings. All joints of tips and plugs with CC ends are threaded.

EFFECT: providing reliability and efficiency of the system for connecting the submersible electric motor to the power cable on the well's top, protected against action of the well's corrosive medium and delivered to the site with maximum availability.

FIELD: oil and gas industry.

SUBSTANCE: invention refers to geo-physical surveys of wells and can be implemented at assembly of well apparatus of telemetry system. The unit consists of an internal threaded bushing and of thrust half-rings. The unit also contains a nut-fairing and a profiled bushing with a flange; on the end of the profiled bushing there are made lugs, while response slots are made on the internal threaded bushing. Also one of the lugs of the profiled bushing is thickened in radial direction, while a module, whereon bushings are assembled, has a slot and a circular groove for the thickened lug; an orienting slot is cut on the flange of the profiled bushing; the response lug entering the orienting slot is made on the end of the second module.

EFFECT: upgraded reliability of assembly modules of telemetric system and improvement of its consumer characteristics.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry and can be implemented at operation of oil wells, where depth electric centrifugal pumps are used as cable inlet of high pressure. To achieve the said, the cable inlet is equipped with two sealing packages. One of the packages consists of a complex back-up plate, of a solid cone seal and of a complex packing washer. The second sealing package consists of a complex back-up plate, of a solid cylinder seal and of a complex packing washer. The cable entry with double sealing package is equipped with two bearings installed on each sealing package. A case is equipped with two channels for pressurisation of the cable inlet with double sealing package; the channels are located between sealing packages and are equipped with two plugs installed in these channels.

EFFECT: facilitating control over pressure tightness of cable inlet during operation, simplified installation of cable inlet, also possibility to use cable inlet for existing well stock.

5 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to equipment for well head pressurising and can be implemented at geophysical survey in horizontal wells with excess pressure at well head by means of geo-physical instruments connected to flow string of small diametre and lowered into well on geo-physical cable together with flow string. When instruments and pipes pass through the well head, pressurising is performed by means of a tube preventer and pipe pressurising facilities. When the geo-physical cable passes through the well head, well head pressurising is performed by means of a cable preventer and attached lubricator. Transition from pressurising with one elements of equipment to pressurising with other elements of equipment is carried out using a special three-coupling branch, arranging it so, that closed die-heads of the pipe preventer are located between two lower couplings of the branch, while the upper coupling is located above an upper flange of pipe pressurising facilities.

EFFECT: expanding functionality at performing survey of horizontal wells and increasing reliability of well head pressurising in process of survey.

5 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to well survey and can be used for borehole cable (BC) geophysical instruments (GI) moving-in to boreholes of inclination angle exceeding 50 degrees. Shielding container fixed on the end of drill column (DC) containing number of drill pipes with upper and lower sectors of DC is lowered. GI is lowered on BC into the borehole. Herewith after drilling to preset depth is complete, DC is lifted to the beginning of intensive borehole crookedness. Upper pipe is disassembled, while lower pipe contains mounted lower module with provided GI with packer neck. Upper pipe is mounted on lower module thereafter lowered to preset depth. GI running is performed on one-piece BC. After running is complete, upper module is mounted above upper pipe of DC. Modules are designed as pipes widened to lateral part of casing pipe thus providing free passage for BC between upper pipe of DC and casing pipe. The shielding container represents a magnetic trap of internal boom drift diameter greater than that of DC, and consists of the case. Lower side face of the case contains a magnet, while lower end side includes wash wire guard.

EFFECT: possibility to run GI on one-piece BC without complete rigging-down required.

2 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to directed drilling equipment, namely to measuring equipment retentions in hermetic enclosure of electronic module of downhole device. The offered electronic module of downhole device contains the enclosure cross-armed in electric divider, radiator with upper end face containing electrical connection to generator, dampers between which there is chassis mounted with electronic components and inclinometer sensors peripheral deposition proof, plug fitting hermetically closing the enclosure from below. Herewith the lower damper contains the puller axially moving in rebore of the plug fitting and radial motion proof by pins. Axial position of the puller is regulated by the screw coaxial to the plug fitting in the hole formed wherein. The hole in the plug fitting is stepped with threaded and cylindrical segments. Cylindrical segment of the hole and the screw are sealed from each other with sealing rings. Threaded segment of the screw is of greater diameter, than cylindrical, and on its end face it contains screwdriver slot from the cylindrical segment. The lower and upper dampers are radial motion proof on the chassis by the pin. The plug fitting is provided with collar over which the plug fitting is pressed to the enclosure end face of the electronic module with sleeve nut.

EFFECT: higher efficiency and reliability of measuring equipment performance and higher overall damper performance due to reduced vibrations ensured by axial fix force control of the enclosure chassis.

12 cl, 3 dwg

FIELD: mining.

SUBSTANCE: facility includes pipe column, pump, packer and subsurface instrument. According to the invention a facility additionally contains a sleeve communicated with the pipe column; the said sleeve is designed with a side aperture located above the packer and under the pump. In the side aperture of the sleeve there is a pipe installed pressure tight; this pipe is installed with its one end inside the sleeve, while with another - outside the sleeve. The pipe ends are made with thread for cable points. The cable points CP-28 are screwed on the pipe ends. A logging cable is secured on the exterior surface of the pipe column. At the top the logging cable is connected with a secondary instrument, while at the bottom it is connected with the cable point CP-28 on the pipe outside the sleeve. Pressure tight cable points CP-28 are connected with a stub cable inside the pipe. On the pipe inside the sleeve the cable point CP-28 is connected with the stub cable of the logging cable, which below is connected with the subsurface instrument, located in the flow of liquid out of a lower bed.

EFFECT: upgraded reliability and efficiency of characterisation of lower bed at simultaneous-separate operation of beds in well.

1 dwg

FIELD: oil and gas production, particularly gas well logging.

SUBSTANCE: device comprises hollow cylindrical body with geared-down electric drive installed in it. Electric drive has tightened drive shaft and electronic circuit. Fluid-tight partitioning bush is arranged in body between electric drive and electronic circuit. The partitioning bush has orifice, which connects electric drive interior with ambient space. Two check valves are arranged inside the orifice. One check valve may be opened by excessive ambient pressure. Another one may be opened under the action of internal excessive pressure.

EFFECT: increased reliability of logging instrument operation due to possibility to compensate pressure applied to output shaft of instruments and elimination of electronic control circuit damage in the case of shaft tightness failure.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes selection of cable of required rigidity and fixing devices on it. Transporting of devices into well is performed under effect from weight of cable and devices. Cable also contains inner hermetic pipe, which is plugged on both sides prior to lowering cable into well. Liquid is pumped into pipe under pressure through locking valve in upper plug and is kept in pipe under constant pressure during operation. After that cable is lowered with devices fixed to it. Value of pressure of liquid in pipe is determined from formula Ppipe≥ Pwell(Scable/Spipe-1)-QcablexLcable/Spipe<Ptear, where Ppipe - pressure of fluid in pipe, kg-wt/sm2; Scable - cross-section of cable with pipe, sm2; Pwell - hydrostatic pressure of well liquid column at depth of planned delivery of devices on cable, kg-wt/sm2; Spipe - cross-section area of pipe aperture and plug area equal to it in contact with liquid in pipe, sm; Qcable - weight of 1 km of cable with pipe, kg-wt; Lcable - length of cable to depth of planned delivery of devices, km; Ptear - pressure of liquid in pipe leading to tear of cable, kg-wt/sm2, determined from formula: Ptear=Ftear/Spipe, where Ftear - tear force for cable according to documentation, kg-wt.

EFFECT: higher efficiency.

3 cl, 1 dwg, 1 tbl

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