CN211086638U - Constant-power focusing lateral system device in laboratory - Google Patents

Abstract

The utility model discloses a constant power focusing lateral system device in a laboratory, which comprises a ground acquisition control panel, an electrode system, a depth transmission device, a simulation test box and an upper computer, wherein the electrode system, the depth transmission device, the simulation test box and the upper computer are electrically connected with the ground acquisition control panel; the ground acquisition control panel consists of a signal processing circuit, a measuring circuit, a deep power amplifier circuit, a shallow power amplifier circuit, an auxiliary monitoring circuit, a main monitoring circuit, a front amplifier circuit, a scale circuit and a depth circuit; conventional bilateral electrode systems are in equal proportion 20: 1, reducing the size, and changing the conventional five pairs of electrodes into four pairs of electrodes. The utility model discloses a constant power focus lateral system device in laboratory adopts software control dark, shallow power supply according to different stratum resistivities for the output of current source changes along with the resistance difference in the stratum of surveying, can effectually obtain the resistivity information in laboratory simulation stratum.

Description

Constant-power focusing lateral system device in laboratory

Technical Field

The utility model belongs to resistivity logging field, in particular to constant power focus lateral system device in laboratory in this field.

Background

In recent years, fractured hydrocarbon reservoirs become hot spots of exploration, cracks can be identified by using a conventional well logging method, but the accuracy is not high, the micro-resistivity scanning well logging can better identify the cracks in the wells, the fractured hydrocarbon reservoirs can be finely described, and the positions, the shapes, the production states and the densities of the cracks can be identified, but whether the cracks have effectiveness or not can not be judged. The response of a fracture on a resistivity curve depends on factors such as the fracture's attitude (dip and azimuth), the fracture's width and length (longitudinal or lateral), the filler in the fracture (cement, mud filtrate, formation fluids, etc.), and the depth of mud invasion. And the fracture joint state can be judged according to the resistivity measured by the constant-power double-laterolog instrument. However, as the formation conditions change, the apparent resistivity curve obtained by measurement is also greatly influenced, and in some cases, the measured curve has a phenomenon which is not in accordance with the knowledge of a well logging interpreter, and the reason may be that: 1. the measurement of the instrument does not meet the measurement condition, 2, the formation condition is complex, and the logging response is influenced by geological parameters. The detection characteristics of various instruments and equipment are analyzed by using a theory, the logging environment is rich, the logging response under different types can be simulated, but the theory and the actual stratum still have a certain difference, an equal proportion laboratory environment measuring system is established, the system becomes a bridge between the verification theory and the actual logging curve, and the development of laboratory resistivity logging equipment is particularly necessary.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a constant power focus lateral system device in laboratory is provided.

The utility model adopts the following technical scheme:

the improvement of a constant power focusing lateral system device in a laboratory is that: the device comprises a ground acquisition control panel, an electrode system, a depth transmission device, a simulation test box and an upper computer, wherein the electrode system, the depth transmission device, the simulation test box and the upper computer are electrically connected with the ground acquisition control panel; the ground acquisition control panel consists of a signal processing circuit, a measuring circuit, a deep power amplifier circuit, a shallow power amplifier circuit, an auxiliary monitoring circuit, a main monitoring circuit, a front amplifier circuit, a scale circuit and a depth circuit; conventional bilateral electrode systems are in equal proportion 20: 1, reducing, changing the conventional five pairs of electrodes into four pairs of electrodes, removing electrode rings A1 and A1 ', keeping A2, A2 ', A1, A1 ', M2, M2', M1, M1' and A0 electrodes, wherein the four pairs of electrodes are symmetrically distributed on two sides by taking the A0 electrode as the center, the A0 is a deep and shallow lateral main current emission electrode, the A2 and the A2 ' are a deep lateral screen current emission electrode and a shallow lateral return electrode, the A1 and the A1 ' are deep and shallow lateral screen current emission electrodes, the M1, the M2 and the M1', and the M2' is a deep and shallow lateral main monitoring electrode; the depth transmission device consists of a motor control box, a servo motor, a transmission module and a sliding track; the inside of the test simulation box is composed of scale resistors.

The lateral method for constant power focusing in laboratory is characterized by that it utilizes computer and ground collection control panel to make command transmission and data transmission, after the command is received, the ground collection control panel can transmit electric signal with fixed frequency to main electrode ring of electrode system, and utilizes current focusing to make no working current flow along the axial direction of the instrument, and can use M2, M1, A0, M1 'and M2' as equipotential, measure the potential difference U of M2 electrode and N electrode, measure the current I flowed from A0 electrode, and calculate the resistivity of saline pool according to the formula Ra K × V/I, Ra is the measured formation resistivity, K is the instrument constant, and is determined by the structure of electrode system, and the forward and backward speeds of electrode system can be controlled by computer, at the same time the position information of electrode system can be detected, and said method is characterized by that the computer can transmit forward or backward speed command to ground collection control panel, and then transmit command to servo electrode system control box by means of data line, and the servo control electrode system can obtain the forward and backward rotation speed information of electrode system, and the depth information of electrode system can be calculated according to the computer control device.

The utility model has the advantages that:

the utility model discloses a constant power focus lateral system device in laboratory adopts software control dark, shallow power supply according to different stratum resistivities for the output of current source changes along with the resistance difference in the stratum of surveying, can effectually obtain the resistivity information in laboratory simulation stratum. And can obtain the largest possible measurement dynamic range and higher measurement precision. The measurement result of the system can be compared with other resistivity logging methods in petroleum logging, a plurality of apparent resistivity curves with different radial detection depths can be provided, abundant stratum information of invasion zones and undisturbed zones is given, cracks with different inclination angles and resistivity response curves of different matrixes can be measured, and further quantitative evaluation can be carried out on geological logging research. The system can effectively evaluate the information of the abnormal bodies and cracks of the stratum by focusing the deep current and the shallow current to obtain resistivity curves of different detection depths, has accurate measurement result and wide applicable resistivity range, and is particularly suitable for high-resistance environment measurement under saline mud.

Drawings

Fig. 1 is a block diagram of a focusing lateral system device disclosed in embodiment 1 of the present invention;

FIG. 2 is a structural diagram of an electrode system in the focusing side system apparatus disclosed in embodiment 1 of the present invention;

fig. 3 is a schematic connection diagram of the focusing side system device disclosed in embodiment 1 of the present invention.

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.

Because the existing double-lateral instrument cannot obtain better resistivity data in some complex terrains, various simulated formations need to be established in a laboratory for carrying out a large number of resistivity measurement experiments. The utility model aims at establishing one set of laboratory constant power focus lateral measurement system equipment (by ground acquisition control panel, electrode system, degree of depth system and analog measurement box are constituteed), can measure the logging response of different resistivity, crack, abnormal body, this result can be compared with on-the-spot logging instrument, can be used for the response characteristic that the analysis field actual instrument appears. Providing basis for a resistivity logging method.

The embodiment 1 discloses a constant-power focusing lateral system device in a laboratory, which is mainly formed by combining a ground acquisition control panel, an electrode system, a depth transmission device, a simulation test box and an upper computer. A system block diagram is shown in fig. 1.

The ground acquisition control panel is a main component of the system and comprises a signal processing circuit, a measuring circuit, a deep power amplifier circuit, a shallow power amplifier circuit, an auxiliary monitoring circuit, a main monitoring circuit, a front amplifier circuit, a calibration circuit and a depth circuit.

The signal processing circuit collects and processes signals Ud (deep lateral direction), Us (shallow lateral direction), Id (deep lateral direction) and Is (shallow lateral direction) of the measuring circuit, and meanwhile the MCU controls the power output of the power control current source of the deep lateral direction and the shallow lateral direction by adopting a certain algorithm according to the measured voltage and current signals. And receiving a command issued by an upper computer through a USB-CAN (Universal Serial bus-to-controller area network), and finishing the functions of internal engraving, well logging state conversion, data transmission, instrument resetting and the like. The scale circuit realizes the calibration of the inner scale of the instrument.

An electrode system: due to the limitation of the laboratory environment, the conventional double-side electrode system is proportioned by 20: 1 is reduced. Due to the size requirement of the shortened electrode system, the conventional five pairs of electrodes are changed into four pairs of electrodes, and the electrode rings A1 and A1 are removed. Four pairs of electrodes a2, a 2', a1, a 1', M2, M2', M1, M1' and a0 electrodes remain. The four pairs of electrodes are symmetrically distributed on two sides by taking the A0 electrode as a center. As shown in fig. 2: a0 is a deep and shallow side-to-side main current emitter electrode. A2 and A2' are deep lateral screen flow emission electrodes; shallow lateral return electrodes. A1 and A1' are deep and shallow lateral screen flow emission electrodes. M1, M2, M1 'and M2' are deep and shallow lateral main monitoring electrodes.

The depth transmission device comprises: the device motor control box, servo motor, transmission module, slip track are constituteed, CAN carry out fixed point and measure and dynamic measurement, and the host computer obtains the speed and the positional information of electrode system through the rotational speed of the degree of depth circuit board communication control electrode in CAN and the ground acquisition control panel.

Simulating a test box: the inside of the test simulation box is composed of scale resistors, and is mainly used for detecting an internal circuit of the acquisition control panel and calibrating the circuit of the panel to obtain a scale coefficient of the circuit.

Fig. 3 shows a schematic diagram of the connection of the constant power focusing side system device in the laboratory, which is used for sending commands and transmitting data through the computer and the ground acquisition control panel 1, the ground acquisition control panel transmits electric signals with fixed frequency to the main electrode ring of the electrode system after receiving the commands, no working current flows along the axial direction of the instrument through current focusing, M2, M1, a0, M1 'and M2' can be regarded as equipotential, the potential difference U between the M2 electrode and the N electrode is measured, the current I flowing out from the a0 electrode is measured, the resistivity of the brine pool 6 is calculated according to the following formula (Ra is K × V/I), Ra is the measured formation resistivity, K is the constant of the instrument and is determined by the structure of the electrode system, the forward and backward speeds of the electrode system can be controlled by the computer, the position information of the electrode system can also be detected, the ground principle is that the computer sends forward or backward speed commands to the acquisition control panel, the ground acquisition control panel sends commands to the servo electrode control box 2 through data lines, the servo control box receives the forward and returns the position information of the servo control device to calculate the electromechanical depth of the electrode system, and the servo control device to calculate the depth of the servo control system, and to calculate the depth of the servo control device.

The focusing lateral system disclosed by the embodiment has the following beneficial effects:

compared with the conventional resistivity measuring equipment, the length of the electrode system of the constant-power focusing lateral system device in the laboratory is shortened to 1/20 of the original length, and the structure of the electrode system is changed due to the size. The original deep lateral auxiliary monitoring electrodes a1 and a 1' were removed. The electronic circuit is placed in a 3U-type case instead of a traditional metal framework installed in a steel barrel. And the AC220 power supply is adopted, so that the functions of current increase, voltage monitoring and the like are realized. The system device enhances the adaptability of the instrument, can perform comparative analysis on an actual field instrument measurement model, has comparability on the result, can be combined with theoretical analysis to finely describe the response change brought by formation cracks and abnormal bodies, and provides a new basis for a resistivity logging method.

2 the interior constant power focus lateral system device of laboratory can regard as the instrument support of the logging response of research under the complicated geological conditions, and has area is little, convenient operation, and is safe, low cost, advantages such as measurement accuracy height, reliable, especially adapted for being used for laboratory teaching research.

3 the constant power focusing lateral system device in the laboratory has the measurement advantages of repeatability and the like, and can be used for analyzing single-factor geological conditions and also analyzing complex multi-factor geological conditions.

4 the depth system of the constant-power focusing lateral system device in the laboratory adopts the servo motor and the sliding track, can accurately control the advance and retreat of the electrode system, can also timely and accurately read the position information of the electrode system, and has the advantages of simple operation, safety and high reliability.

Claims (1)

1. The utility model provides a constant power focus lateral system device in laboratory which characterized in that: the device comprises a ground acquisition control panel, an electrode system, a depth transmission device, a simulation test box and an upper computer, wherein the electrode system, the depth transmission device, the simulation test box and the upper computer are electrically connected with the ground acquisition control panel; the ground acquisition control panel consists of a signal processing circuit, a measuring circuit, a deep power amplifier circuit, a shallow power amplifier circuit, an auxiliary monitoring circuit, a main monitoring circuit, a front amplifier circuit, a scale circuit and a depth circuit; conventional bilateral electrode systems are in equal proportion 20: 1, reducing, changing the conventional five pairs of electrodes into four pairs of electrodes, removing electrode rings A1 and A1 ', keeping A2, A2 ', A1, A1 ', M2, M2', M1, M1' and A0 electrodes, wherein the four pairs of electrodes are symmetrically distributed on two sides by taking the A0 electrode as the center, the A0 is a deep and shallow lateral main current emission electrode, the A2 and the A2 ' are a deep lateral screen current emission electrode and a shallow lateral return electrode, the A1 and the A1 ' are deep and shallow lateral screen current emission electrodes, the M1, the M2 and the M1', and the M2' is a deep and shallow lateral main monitoring electrode; the depth transmission device consists of a motor control box, a servo motor, a transmission module and a sliding track; the inside of the test simulation box is composed of scale resistors.

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