Cable magnetic mark acquisition imaging system and method

Abstract

The invention discloses a cable magnetic mark acquisition imaging system and method, a cable magnetic mark is received by a cable magnetic mark conditioning circuit and conditioned into a clear cable magnetic mark signal, the conditioned signal is sent to a borehole diameter acquisition channel, and the output of the borehole diameter acquisition channel is connected to a cable magnetic mark acquisition circuit. The output of the cable magnetic mark acquisition circuit is connected with a ground acquisition front-end machine, so that the ground acquisition front-end machine can normally acquire a cable magnetic mark signal and display an MMD curve on a screen in real time, and the OCTLet of a borehole diameter acquisition channel is adaptively modified; according to the cable magnetic mark signal acquisition circuit, idle and unused acquisition channels of an original system are fully utilized for acquisition, so that cable magnetic mark signals can be conveniently acquired on the original system; a clear cable magnetic mark curve can be measured under different speed measurement conditions, and particularly, a satisfactory cable magnetic mark curve can be obtained in a well logging project with low speed measurement.

Description

Technical Field

[0001] This invention belongs to the field of oilfield logging technology, specifically relating to a cable magnetic signal acquisition and imaging system and method. Background Technology

[0002] The ECLIPS 5700 imaging logging system is an imaging logging system introduced to my country from BAKER HUGHES in the United States. This system can be connected to various downhole instruments such as resistivity imaging, wellbore acoustic imaging, array induction, cross dipole acoustic logging, and nuclear magnetic resonance logging. The logging data obtained can provide better information on formation fractures, formation stress changes, formation resistivity, porosity, and permeability. Based on the data obtained from these instruments, lithology can be better classified and reservoir properties can be identified.

[0003] Existing imaging logging systems generally use cable magnetic markings for logging depth correction, but the processing methods for these markings differ. One method involves displaying the depth of each marking on the winch panel, allowing the operator to determine the cable depth error based on the displayed depth. Another method involves acquiring the cable magnetic marking curve and comparing it with a printed graph for precise cable depth correction. Currently, the ECLIPS5700 cannot display the cable magnetic marking curve and graph in real time, making it unsuitable for using the cable magnetic marking curve method for precise logging depth correction. Summary of the Invention

[0004] The purpose of this invention is to provide a cable magnetic signal acquisition and imaging system and method to overcome the problem that the existing ECLIPS-5700 logging system cannot acquire, display and generate maps of cable magnetic signals, and cannot submit cable magnetic signal curve data to the logging data interpretation center.

[0005] To solve the above problems, the present invention adopts the following technical solution: A cable magnetic signal acquisition and imaging system includes a cable magnetic signal conditioning circuit, a cable magnetic signal acquisition circuit, a well diameter acquisition channel, and a ground acquisition front-end unit. The output of the cable magnetic signal conditioning circuit is electrically connected to the input of an idle well diameter acquisition channel, the output of the well diameter acquisition channel is electrically connected to the cable magnetic signal acquisition circuit, and the output of the cable magnetic signal acquisition circuit is connected to the ground acquisition front-end unit via a serial data line. The OCTLet of the well diameter acquisition channel is adaptively modified to ensure that the ground acquisition front-end unit can acquire the cable magnetic signal output by the cable magnetic signal acquisition circuit.

[0006] Furthermore, the cable magnetic signal conditioning circuit includes a three-stage operational amplifier, with a capacitor provided on the input side of the first-stage operational amplifier. Furthermore, the size of the capacitor is 0.1uF. Furthermore, the second and third operational amplifiers of the three-stage operational amplifier are low-pass filter amplifiers. Furthermore, the cable magnetic signal conditioning circuit has an amplification factor of 604.8, a cutoff frequency of 6.8Hz, and an input impedance of 2MΩ. Furthermore, the cable magnetic signal acquisition circuit includes an analog switch, a low-pass filter amplifier, and an analog-to-digital converter. The cable magnetic signal output from the cable magnetic signal conditioning circuit is connected to the well diameter acquisition channel and input to the analog-to-digital converter via the analog switch and low-pass filter amplifier. Furthermore, the output signals of the wellbore acquisition channel include CAL-HI and CAL-LO. Furthermore, the steps for adaptively modifying the OCTLet of the wellbore acquisition channel are as follows: Open the binary code file of the OCTLet instrument in the caliper acquisition channel, replace CAL with MMDAMP, and save it after replacement; Define the MMDAMP curve as mmdamp.crv and store it in the / cls2 / pdf / deault / crv directory; Edit the oct.crvs file used to make oct.crvs contain mmdamp.crv; Add the mmdamp.crv curve scale to the / cls2 / pdf / default / scale / auxy.scale file. Furthermore, the model of the wellbore acquisition channel instrument is 4209XA.

[0007] Secondly, a working method for a cable magnetic signal acquisition and imaging system is provided, including the following steps: The cable magnetic signature signal conditioning circuit receives the cable magnetic signature signal output from the automotive ignition coil; The cable magnetic signal output from the cable magnetic signal conditioning circuit is input to the idle well diameter acquisition channel. The OCTLet of the well diameter acquisition channel is modified. The well diameter acquisition channel is electrically connected to the cable magnetic signal acquisition circuit. Connect the cable magnetic signal output from the cable magnetic signal acquisition circuit to the ground acquisition front-end unit. Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a cable magnetic signature acquisition and imaging system, including a cable magnetic signature conditioning circuit and a wellbore acquisition channel connected to its output. The cable magnetic signature is received and conditioned into a clear signal by the conditioning circuit. The conditioned signal is then sent to the wellbore acquisition channel, whose output is connected to the cable magnetic signature acquisition circuit. The output of the cable magnetic signature acquisition circuit is connected to a surface acquisition front-end unit. To enable the surface acquisition front-end unit to acquire cable magnetic signature signals normally and display the MMD curve in real time on the screen, the OCTLet of the wellbore acquisition channel is adaptively modified. This invention's cable magnetic signature signal acquisition circuit fully utilizes unused acquisition channels in the original system, facilitating the acquisition of cable magnetic signature signals on existing systems. Clear cable magnetic signature curves can be obtained at different logging speeds, especially in low-speed logging projects, where satisfactory curves can be obtained. The cable magnetic signature curves can be used to monitor the logging depth system, perform precise depth correction on logging data, and submit qualified MMD curve data to the logging data interpretation center.

[0008] Preferably, only minor modifications are needed to the existing hardware circuitry, no additional wiring is required between boards, and the various functions of the original system are not affected.

[0009] Preferably, a capacitor is provided on the input side of the first-stage operational amplifier of the cable magnetic signal conditioning circuit, which can filter out interference generated by the transmission line during signal transmission. Preferably, the cutoff frequency of the low-pass filter in the cable magnetic signal conditioning circuit is changed from 4.3kHz to 6.8Hz. This effectively reduces baseline noise interference, and the input impedance of the MMD conditioning circuit is increased from 1KΩ to 2MΩ, thereby improving the sensitivity of signal reception.

[0010] Preferably, by generating a new OCT containing 4209XA, the CAL channel is used to acquire the analog signal of the cable magnetic mark, and the curve is displayed on the screen in real time through the acquisition software. The cable magnetic mark curve is then printed onto the drawing film through the drawing software, thus realizing the acquisition of MMD curves for all well logging projects. This invention provides a working method for a cable magnetic signal acquisition and imaging system. The cable magnetic signal output from the cable magnetic signal conditioning circuit is sent to an idle well diameter acquisition channel, and then sent to the cable magnetic signal acquisition circuit through the well diameter acquisition channel. Finally, the cable magnetic signal is acquired by the ground acquisition front-end unit, realizing the imaging work of the cable magnetic signal. By modifying the OCTlet of 4209XA, the acquisition, display and plotting functions of the cable magnetic signal are realized, solving the problem that the 5700 logging system cannot perform MMD curve acquisition, display and plotting. Attached Figure Description

[0011] Figure 1 This is a flowchart illustrating the working method of a cable magnetic mark acquisition and imaging system according to an embodiment of the present invention. Figure 2 This is a circuit diagram for cable magnetic marking conditioning. Figure 3 This is a schematic diagram of the SDB board cable magnetic mark acquisition circuit. Figure 4 a is a schematic diagram of the OCTLETUIF operation interface; Figure 4 b is a schematic diagram of adding the 4209XA OCTlet; Figure 5 A schematic diagram of OCT acquisition including cable magnetic symbols for radioactive string logging; Figure 6 This is a schematic diagram of the MMD curves measured at different speeds. Detailed Implementation

[0012] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0013] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0014] Definitions: MMD: Cable magnetic marking.

[0015] This invention provides a cable magnetic signal acquisition and imaging system, including a cable magnetic signal conditioning circuit. The cable magnetic signal conditioning circuit receives MMD signals, improving signal reception sensitivity. The cable magnetic signal output from the conditioning circuit is electrically connected to the borehole acquisition channel. The cable magnetic signal acquisition circuit, connected to the borehole acquisition channel, completes the acquisition of cable magnetic signals. The output of the cable magnetic signal acquisition circuit is connected to a ground acquisition front-end unit to realize the acquisition, display, and mapping of cable magnetic signals. To achieve cable magnetic signal acquisition, the conditioned cable magnetic signal needs to be sent to an idle borehole acquisition channel for analog-to-digital conversion. The cable magnetic signal is then acquired through the borehole acquisition channel, and the OCTLet of the borehole acquisition channel is adaptively modified to ensure that the ground system software can acquire the cable magnetic signal output from the cable magnetic signal acquisition circuit.

[0016] Specifically, the invention comprises two parts: first, a redesign of the cable magnetic signal conditioning circuit in hardware, which sends the conditioned cable magnetic signal to the ground analog-to-digital conversion channel for digitization; second, the generation of an acquisition control table (OCT) containing cable magnetic signal acquisition in software, which realizes the acquisition, recording and mapping functions of cable magnetic signal for all well logging projects.

[0017] I. Hardware Circuit Design The existing cable magnetic signal conditioning circuit cannot receive effective cable magnetic signal, so the input impedance, low-pass filter characteristics and amplification factor of the existing conditioning circuit need to be redesigned.

[0018] This invention provides a cable magnetic mark signal conditioning circuit that can effectively receive the MMD signal output by the automotive ignition coil and then send the output cable magnetic mark signal to the ground well diameter acquisition channel for acquisition.

[0019] The cable magnetic signature conditioning circuit for the ECLIPS-5700 imaging system is located on the ESP board of the 5752 acquisition enclosure. The redesigned cable magnetic signature conditioning circuit can be found here. Figure 2 The circuit consists of three operational amplifier stages. The MMD signal output by the sensor is first sent to A4 (AD620) for amplification. The resistor here is replaced with a capacitor, that is, R161 is replaced with a capacitor. The R161 (0.1uF) capacitor filters out the interference generated by the transmission line during signal transmission. The amplification factor of A4 is 50.4. The amplified MMD signal is sent to a low-pass filter composed of A7 for filtering. The amplification factor of the first-stage filter is 2, and the amplification factor of the second-stage filter is 6.

[0020] The cable magnetic signature signal conditioning circuit has an amplification factor of 604.8, and the cutoff frequency of the low-pass filter has been changed from 4.3kHz to 6.8Hz. This effectively reduces baseline noise interference. The input impedance of the MMD conditioning circuit has been increased from 1KΩ to 2MΩ, improving the signal reception sensitivity. Using an automotive ignition coil as the cable magnetic signature receiving sensor, this circuit can acquire clear cable magnetic signature signals.

[0021] The cable magnetic signature signal, conditioned by the cable magnetic signature signal conditioning circuit, is sent to J1-23 via TP14, and then to the CAL channel of the SDB for digitization. The circuit diagram for the cable magnetic signature signal acquisition on the designed SDB board is shown below. Figure 3 .

[0022] The cable magnetic mark signal acquisition circuit is introduced into the signal acquisition channel from J105 on the SDB board. At the same time, the signals output from the well diameter acquisition channel, including CAL-HI and CAL-LO, are also used as inputs. After being divided by R69, C49, and R259, the signals are sent to analog switch A33. The function of C49 is to filter out the interference signals generated by the connection. After passing through analog switch A33, the signals are sent to low-pass filter amplifier for filtering, and then sent to analog-to-digital converter A35 for digitization.

[0023] The cable magnetic mark signal acquisition circuit makes full use of the unused acquisition channels in the original system for acquisition, which facilitates the acquisition of cable magnetic mark signals on the original system.

[0024] II. OCT generation method with MMD acquisition function To acquire cable magnetic signature signals using the 4209XA wellbore acquisition channel (which is no longer used), and to ensure the ground system can correctly acquire these signals and display the MMD curve in real time, the OCTLetter of the 4209XA instrument needs to be redesigned. The method for designing the OCTLetter of the 4209XA instrument is as follows: (1) Open the binary code file of OCTLet of the 4209XA instrument, replace CAL with MMDAMP, and save it after replacement; (2) Define the MMDAMP curve: mmdamp.crv, and store it in the / cls2 / pdf / deault / crv directory; (3) Edit the oct.crvs file to include mmdamp.crv; (4) Add the mmdamp.crv curve scale to the / cls2 / pdf / default / scale / auxy.scale file; The above steps complete the design of the OCTLet for the 4209XA instrument.

[0025] To acquire MMD analog signals, the running OCT must include 4209XA. For OCTs without 4209XA, the OCTLETUIF program in OCT management can be used to add 4209XA to the OCT to be executed. The following explanation uses radioactive string logging as an example. Radioactive string logging typically includes 3981XA, 3514XB, 1329XA, 2446XA, and 2228XA. The OCTLETUIF program adds 4209XA to the radioactive string OCT; its interface is shown below. Figure 4 a, Figure 4 As shown in b.

[0026] The operation steps are as follows: (1) Open the OCTLETUIF menu, click Edit, and select Add OCTlet(s) (see...) Figure 4 a).

[0027] (2) According to the requirements of the logging project, add the required logging instruments and enter the instrument serial number. The OCTlet options for that instrument will then pop up (see...). Figure 6 (Right side). Add OCTlets 4209, 3514, 2446, and 2228 respectively. When adding the 4209XA OCTlet, you must select the OCTlet with master57XXFFs3 to complete the ground CAL acquisition. (See...) Figure 4 b).

[0028] (3) After adding the required instruments, enter the OCT Name and save. Then, select the submenu Compile, Gen Display & Edit OCT in the Generate menu to generate the required OCT (see...). Figure 5 ).

[0029] (4) Further edit the generated OCT and delete unnecessary instruments. Since the 4209XA instrument is not actually connected, it is necessary to move the 4209XA to the bottom of the instrument string, change the instrument length and measurement point of the 4209XA to 0, and then move the 4209XA to the lower end of the cable head.

[0030] (5) Use the edited OCT for logging operations. When acquiring data, name the MMD curve CALx. After logging, rename the CALx curve to MMD.

[0031] In the 5700 logging system, all OCTs support the 4209XA dual-caliper instrument. By generating a new OCT containing the 4209XA, the CAL channel is used to acquire the analog signal of the cable magnetic mark. The acquisition software displays the curve on the screen in real time, and the drawing software prints the cable magnetic mark curve onto the drawing film, thus realizing the acquisition of MMD curves for all logging projects.

[0032] Example This invention was implemented on the ESP board of the ECLIPS5700 system according to the designed hardware conditioning circuit, as follows: Figure 2 As shown. The cable magnetic signal received by the car ignition coil passes through analog switch A1, then through R161 (0.1uF) to filter out interference from the transmission line. After being divided by R143 and R144, R143 and R144 retain most of the signal, which is then sent to operational amplifier A4 for amplification via R36 and R37. The amplification factor of A4 is 50.4. The output of A4 is sent to the next stage low-pass filter via R132. The low-pass filter consists of R132, R18, R19, R20, C140, C139, and operational amplifier A7A. The -3dB cutoff frequency of this stage filter is 6.8Hz, and the amplification factor is 2. The output of A7A is sent to non-inverting amplifier A7C via R21. The amplification factor of A7C is 6. The output of A7C is connected to pin 23 of J1 via a wire.

[0033] Implementing the circuit designed according to this invention, the cable magnetic signal conditioning circuit has an amplification factor of 604, and the cutoff frequency of the low-pass filter is changed from 4.3KHz to 6.8Hz, effectively reducing baseline noise interference. The input impedance of the MMD conditioning circuit is increased from 1kΩ to 2MΩ, improving signal reception sensitivity. Finally, the conditioned MMD signal is sent to J1-23, ready for digitization via the CAL channel of the SDB board.

[0034] The acquisition circuit designed according to the present invention, such as Figure 3 As shown, the conditioned cable magnetic signature signal is sent to the CAL channel of the SDB board for A / D conversion. The method is as follows: First, J105 is connected to D13 via a wire. After voltage division by R69 and R259, the signal is sent to pin 18 of analog switch A33. C49 filters out interference generated by the connecting wire. After passing through analog switch A33, the signal is sent out from pin 19, and then through R326 to the non-inverting input of voltage buffer A31B for buffering and filtering. The output of A31B is then sent through R72 to pin 7 of A / B converter A35 for analog-to-digital conversion.

[0035] Following the method of the OCT with MMD acquisition function described in the invention, a 5700 acquisition OCT was generated, realizing the acquisition, display, and plotting functions of MMD for all logging items of the 5700. According to the method of this invention, the 5700 logging system can obtain satisfactory MMD curve data under different logging velocities. Figure 6 .

[0036] Furthermore, this invention also provides a method for operating a cable magnetic signal acquisition and imaging system, such as... Figure 1 As shown, it includes the following steps: The cable magnetic signature signal conditioning circuit receives the cable magnetic signature signal output from the automotive ignition coil; The cable magnetic signal output from the cable magnetic signal conditioning circuit is input to the idle well diameter acquisition channel. The OCTLet of the well diameter acquisition channel is modified. The well diameter acquisition channel is electrically connected to the cable magnetic signal acquisition circuit. Connect the cable magnetic signal output from the cable magnetic signal acquisition circuit to the ground acquisition front-end unit.

[0037] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A cable magnetic marking acquisition imaging system, characterized by, It includes a cable magnetic signal conditioning circuit, a cable magnetic signal acquisition circuit, a well diameter acquisition channel, and a ground acquisition front-end unit. The output of the cable magnetic signal conditioning circuit is electrically connected to the input of the idle well diameter acquisition channel, the output of the well diameter acquisition channel is electrically connected to the cable magnetic signal acquisition circuit, and the output of the cable magnetic signal acquisition circuit is connected to the ground acquisition front-end unit through a serial data line. The OCTLet of the well diameter acquisition channel is adaptively modified to ensure that the ground acquisition front-end unit can acquire the cable magnetic signal output by the cable magnetic signal acquisition circuit.

2. A cable magnetic marker acquisition imaging system according to claim 1, wherein, The cable magnetic signal conditioning circuit includes a three-stage operational amplifier, with a capacitor on the input side of the first-stage operational amplifier.

3. A cable magnetic marker acquisition imaging system according to claim 2, wherein, The capacitor has a size of 0.1uF.

4. The cable magnetic signal acquisition and imaging system according to claim 2, characterized in that, The second and third operational amplifiers of the three-stage operational amplifier are low-pass filter amplifiers.

5. The cable magnetic signal acquisition and imaging system according to claim 1, characterized in that, The cable magnetic signal conditioning circuit has an amplification factor of 604.8, a cutoff frequency of 6.8Hz, and an input impedance of 2MΩ.

6. The cable magnetic signal acquisition and imaging system and method according to claim 1, characterized in that, The cable magnetic signal acquisition circuit includes an analog switch, a low-pass filter amplifier, and an analog-to-digital converter. The cable magnetic signal output from the cable magnetic signal conditioning circuit is connected to the well diameter acquisition channel and input to the analog-to-digital converter via the analog switch and low-pass filter amplifier.

7. A cable magnetic signal acquisition and imaging system according to claim 1 or 6, characterized in that, The output signals of the wellbore acquisition channel include CAL-HI and CAL-LO.

8. The cable magnetic signal acquisition and imaging system according to claim 1, characterized in that, The steps of the OCTLet for adaptively modifying the wellbore acquisition channel are as follows: Open the binary code file of the OCTLet instrument in the caliper acquisition channel, replace CAL with MMDAMP, and save it after replacement; Define the MMDAMP curve as mmdamp.crv and store it in the / cls2 / pdf / deault / crv directory; Edit the oct.crvs file used to make oct.crvs contain mmdamp.crv; Add the mmdamp.crv curve scale to the / cls2 / pdf / default / scale / auxy.scale file.

9. The cable magnetic signal acquisition and imaging system according to claim 1, characterized in that, The instrument used for the wellbore acquisition channel is model 4209XA.

10. A method for operating the cable magnetic signal acquisition and imaging system according to claim 1, characterized in that, Includes the following steps: The cable magnetic signature signal conditioning circuit receives the cable magnetic signature signal output from the automotive ignition coil; The cable magnetic signal output from the cable magnetic signal conditioning circuit is input to the idle well diameter acquisition channel. The OCTLet of the well diameter acquisition channel is modified. The well diameter acquisition channel is electrically connected to the cable magnetic signal acquisition circuit. Connect the cable magnetic signal output from the cable magnetic signal acquisition circuit to the ground acquisition front-end unit.

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