CN211819367U - Microwave array sidewall contact and wall-contact dielectric logging instrument - Google Patents

Abstract

The utility model discloses a microwave array pushing wall-against well wall type dielectric logging instrument, which comprises an array antenna probe, an electronic circuit and a power supply short section; the electronic circuit comprises an array antenna interface, a transmitting module, a receiving module, a microwave switch module, a multi-channel high-precision analog-to-digital conversion circuit and a DSP digital signal processing circuit; the logging instrument adopts a borehole diameter sidewall contact device to be connected with a high-frequency measuring probe through a hinged joint. The utility model discloses a microwave array pushes away and leans on pastes wall of a well formula dielectric logging instrument can be in high temperature high pressure, different well underground environment condition work, through the detecting probe transmission microwave section electromagnetic wave that pastes the wall of a well, and the microwave section electromagnetic wave is propagated through the stratum, receives phase place and the amplitude information of handling the electromagnetic wave by array reception probe, and then can the back calculation obtain the dielectric constant of the different degree of depth of corresponding stratum.

Description

Microwave array sidewall contact and wall-contact dielectric logging instrument

Technical Field

The utility model belongs to the oil field logging instrument field, in particular to microwave array pushes away and pastes wall of a well formula dielectric logging instrument in this field.

Background

Low resistivity oil layer and high resistivity water layer common in oil field multiple exploitation. The resistivity method is often used for effectively distinguishing an oil-water layer, and the relative dielectric constant (about 80) of water and the relative dielectric constant (2-4) of oil are greatly different; therefore, the measurement of the dielectric constant can distinguish oil, gas and water layers more simply than other means, and the frequency of the early dielectric instrument is between 20M and 1.1 GHz. However, due to the complex explanation and the low reliability of hardware, the instrument is very sensitive to borehole irregularities, mudcake and eccentricity effects and is influenced by the rock skeleton, and most of the instruments are not widely applied until the beginning of the 21 st century, and the application is reduced year by year.

Disclosure of Invention

The utility model aims to solve the technical problem that a microwave array pushes away and pastes wall of a well formula dielectric logging instrument is provided, utilize microwave section multi-antenna array transmission electromagnetic wave propagation principle to measure the borehole around stratum dielectric constant and the borehole logging instrument in pit of porosity that contains water, can analyze fresh water environment reservoir, discernment flowable oil gas.

The utility model adopts the following technical scheme:

a microwave array pushes away and pastes wall of a well formula dielectric logging instrument, its improvement lies in: the array antenna probe comprises an array antenna probe, an electronic circuit and a power supply short section; the electronic circuit comprises an array antenna interface, a transmitting module, a receiving module, a microwave switch module, a multi-channel high-precision analog-to-digital conversion circuit and a DSP digital signal processing circuit; the logging instrument adopts a borehole diameter sidewall contact device to be connected with a high-frequency measuring probe through a hinged joint.

Furthermore, the hinged joint is an arc-shaped full-hinged polar plate.

Further, the array antenna probe adopts a magnetic dipole.

The utility model has the advantages that:

the utility model discloses a microwave array pushes away and leans on pastes wall of a well formula dielectric logging instrument can be in high temperature high pressure, different well underground environment condition work, through the detecting probe transmission microwave section electromagnetic wave that pastes the wall of a well, and the microwave section electromagnetic wave is propagated through the stratum, receives phase place and the amplitude information of handling the electromagnetic wave by array reception probe, and then can the back calculation obtain the dielectric constant of the different degree of depth of corresponding stratum.

The utility model discloses a microwave array pushes away and leans on wall of a well formula dielectric logging instrument has different detection depth, does not receive characteristics such as rock structure, stratum water mineralization degree influence. The oil-water layer is distinguished by using the fact that the relative dielectric constant values of a rock skeleton and hydrocarbon substances are low, the relative dielectric constant value of water is high, and the influence of the mineralization degree of formation water is hardly caused; when the conventional electric logging cannot well perform oil-water stratification in certain stratums, the dielectric logging instrument can well distinguish a water layer from an oil layer.

Drawings

FIG. 1 is a schematic diagram of a dielectric logging tool disclosed in embodiment 1 of the present invention;

fig. 2(a) is a diagram of the interface location of a dual-transmit-four-receive array antenna;

FIG. 2(b) is a diagram of the interface location of a dual transmit eight receive array antenna;

FIG. 3 is a block diagram of the components of the microwave launching system;

FIG. 4 is a block diagram of the components of the multi-channel receive circuitry;

FIG. 5 is a diagram illustrating measurement of an actual formation by a high frequency array dielectric tool.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiment 1, as shown in fig. 1, this embodiment discloses a microwave array pushing wall-against-borehole type dielectric logging instrument, which includes three functional components of an array antenna probe, an electronic circuit, and a power supply cartridge. The electronic circuit mainly comprises: the system comprises an array antenna interface, a transmitting module, a receiving module, a microwave switch module, a multi-channel high-precision analog-to-digital conversion circuit and a DSP digital signal processing circuit.

The underground instrument adopts a borehole diameter sidewall contact device 1 to be connected with a high-frequency measuring probe 3 through a hinged joint 2, so that the dielectric instrument can be well attached to a borehole wall.

Hole diameter hydraulic sidewall contact device: the polar plate pushing and retracting action can be realized as a power device of the underground instrument, when the instrument is lowered, the array dielectric measurement polar plate can be contracted in an instrument groove of the sidewall contact device, and the upward well logging is realized by pushing the polar plate probe to be attached to a well wall for measurement. The influence of mud in the well on the measurement accuracy is overcome.

Full articulated joint: the articulated joint can be flexibly bent, stretched and bent, so that the polar plate is flexibly adjusted to fit the well wall.

Array dielectric measurement plate: the system comprises an array antenna interface, a microwave transmitting system, a multi-channel receiving circuit system, a high-precision synchronous acquisition system and a DSP main control system. The microwave circuit system is highly integrated.

The array antenna interface is shown in fig. 2a and 2 b: the antenna array is composed of a plurality of antennas and an impedance conversion circuit, is used as a microwave band transmitting antenna to transmit broadband signals (20 MHz-1 GHz) to the stratum, and is also used as an array receiving antenna to receive echo signals propagated through the stratum. And realize the impedance matching conversion with the microwave transmitting system and the receiving system.

As shown in fig. 3, the microwave transmission system: the microwave band broadband signal transmitting device mainly comprises a signal transmitting source, a ceramic resonant filter and a digital program-controlled high-gain high-power amplifier, and mainly realizes the transmission of microwave band broadband signals (20 MHz-1 GHz).

As shown in fig. 4, the multi-channel receiving circuitry: the device consists of a selector switch, an ultra-low noise amplifier, a band-pass filter, a microwave band mixer and a program-controlled gain amplification filter; processing low-noise amplification, filtering, down-conversion and the like on the multi-path stratum echo weak signals is completed;

high-precision synchronous acquisition system: a high-temperature rail-to-rail operational amplifier, a high-precision reference power supply and a multi-channel high-precision synchronous acquisition analog-to-digital converter are adopted to realize digital conversion of multi-channel processed echo analog signals.

The DSP master control system: the high-speed floating point operation system is composed of a high-speed floating point operation DSP TMS320F28335 main controller, high-temperature multi-path reference voltage, a high-speed crystal oscillator and a large-capacity memory, and is isolated with CAN communication drive; and finishing the calculation of the digital signal and the control and adjustment of the working state of the instrument.

High frequency array dielectric practical application: the high-frequency array dielectric logging instrument is applied to actual development exploration wells of a plurality of oil fields in China, and a better logging material is obtained (as shown in the following figure 5). Compared with the conventional logging method, the array dielectric logging curve well reflects formation information and has obvious difference on an oil-water layer; water layer: HD31= 17.4; oil layer: HD31= 10.3.

In the embodiment, all electronic units of the dielectric instrument are integrated on the bendable polar plate through technical innovation, the fully-hinged polar plate is adopted, the fully-hinged polar plate can be better contacted with a well wall stratum, and the influence caused by irregular well holes can be reduced by adopting a symmetrical multi-array transmitting and receiving antenna mode; overcomes the defects of the prior instrument.

The embodiment provides a high-frequency array wall-attached dielectric logging instrument, which adopts a full-hinged polar plate and can ensure that the polar plate is well contacted with the stratum. The full-hinged polar plate is arc-shaped, the antenna is designed into a magnetic dipole, and the polar plate is pushed to a borehole wall stratum through a clinging arm of a caliper so that the arrayed transmitter and the receiver are tightly attached to the borehole wall. The defects that the existing dielectric instrument is not well attached to a well wall and is easily influenced by the mixing of different components of slurry and stratum in the well to the measurement precision are overcome; meanwhile, a plurality of transmitting and receiving magnetic dipole antennas are adopted to form an array antenna combination for borehole compensation, and a plurality of microwave band working frequencies can be used for measuring the anisotropic information of strata at different depths.

Claims (3)

1. A microwave array pushes away and pastes wall of a well formula dielectric logging instrument, its characterized in that: the array antenna probe comprises an array antenna probe, an electronic circuit and a power supply short section; the electronic circuit comprises an array antenna interface, a transmitting module, a receiving module, a microwave switch module, a multi-channel high-precision analog-to-digital conversion circuit and a DSP digital signal processing circuit; the logging instrument adopts a borehole diameter sidewall contact device to be connected with a high-frequency measuring probe through a hinged joint.

2. The microwave array sidewall contact dielectric logger of claim 1 further comprising: the hinged joint is a circular arc-shaped full-hinged polar plate.

3. The microwave array sidewall contact dielectric logger of claim 1 further comprising: the array antenna probe adopts a magnetic dipole.

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