CN111022033A

CN111022033A - Microwave array sidewall contact and wall-contact dielectric logging instrument

Info

Publication number: CN111022033A
Application number: CN201911332681.0A
Authority: CN
Inventors: 李郴; 李智强; 李俊一; 陆保印; 李凡贡; 马广彬
Original assignee: China Institute of Radio Wave Propagation CETC 22 Research Institute
Current assignee: China Institute of Radio Wave Propagation CETC 22 Research Institute
Priority date: 2019-12-22
Filing date: 2019-12-22
Publication date: 2020-04-17

Abstract

The invention discloses a microwave array sidewall contact wall-clinging 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 microwave array sidewall contact well wall type dielectric logging instrument disclosed by the invention can work under high temperature and high pressure and different well underground environment conditions, microwave band electromagnetic waves are transmitted by the detection probe contacting the well wall, the microwave band electromagnetic waves are transmitted through the stratum, the phase and amplitude information of the electromagnetic waves is received and processed by the array receiving probe, and further the dielectric constants of different depths of the corresponding stratum can be obtained by inversion calculation.

Description

Microwave array sidewall contact and wall-contact dielectric logging instrument

Technical Field

The invention belongs to the field of oil field logging instruments, and particularly relates to a microwave array sidewall contact and wall contact type dielectric logging instrument in the 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 invention aims to solve the technical problem of providing a microwave array sidewall-contact well wall type dielectric logging instrument, which is an underground logging instrument for measuring the formation dielectric constant and the water-containing porosity around a well hole by utilizing the propagation principle of transmitting electromagnetic waves by a microwave band multi-antenna array, and can analyze a reservoir stratum in a fresh water environment and identify flowable oil and gas.

The invention 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 invention has the beneficial effects that:

the microwave array sidewall contact well wall type dielectric logging instrument disclosed by the invention can work under high temperature and high pressure and different well underground environment conditions, microwave band electromagnetic waves are transmitted by the detection probe contacting the well wall, the microwave band electromagnetic waves are transmitted through the stratum, the phase and amplitude information of the electromagnetic waves is received and processed by the array receiving probe, and further the dielectric constants of different depths of the corresponding stratum can be obtained by inversion calculation.

The microwave array sidewall-pushing well wall-clinging type dielectric logging instrument disclosed by the invention has the characteristics of different detection depths, no influence of rock structures, formation water mineralization and the like. 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 according to 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 apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. 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

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.