CN102003172B - Logging depth correction computation method in logging system - Google Patents

Logging depth correction computation method in logging system Download PDF

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Publication number
CN102003172B
CN102003172B CN 201010513894 CN201010513894A CN102003172B CN 102003172 B CN102003172 B CN 102003172B CN 201010513894 CN201010513894 CN 201010513894 CN 201010513894 A CN201010513894 A CN 201010513894A CN 102003172 B CN102003172 B CN 102003172B
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China
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depth
cable
weight
logging
output
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CN 201010513894
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Chinese (zh)
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CN102003172A (en
Inventor
吴兴东
宋扬
张瑞吉
张阿朋
徐志彦
徐进师
巫国心
魏阳
韩国彬
刘卫东
赵超
韩海力
张进
王毓
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青岛杰瑞自动化有限公司
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Abstract

The invention discloses a logging depth correction computation method in a logging system. The method comprises the following steps of: counting forward and reverse pulse signals fed back by a coding wheel and reflecting the forward and reverse conditions of a cable wheel disc; performing cable wheel disc abrasion correction and cable stretching correction on the counting values; and computing the actual logging depth according to the corrected counting values. The correction computation method can acquire a more accurate logging depth value so as to provide support for acquiring accurate logging data to well meet the current logging operation requirement. Thermal redundancy backup technology is adopted in a key signal processing module in the logging system so as to improve the operating reliability of the system and ensure the equipment safety of the logging operation.

Description

Depth-logger correction calculation method in the logging system

Technical field

The invention belongs to the oil exploration technology field, relate to the logging technique in a kind of oil exploration process, specifically, relate to a kind of computational methods that the detected depth-logger of logging system is proofreaied and correct.

Background technology

Petroleum well logging technology is a key areas of petroleum industry technology, comprised logging method, logger equipment and to the research direction of three interdependences such as processing of well-log information.Logging technique originates from French Si Lunbeixie company in nineteen twenty-seven, and nineteen thirty-nine, China began logging technique is applied to petroleum industry.Over more than 70 year, logging technique has experienced the development course from the simulation well logging to digital logging, Sub-system in Computerized Logging System, imaging logging, one of ten large oil subjects have been developed at present, and be widely used in the overall process of the exploration and development of oil gas field, provide important data and data for petroleum geology and engineers and technicians seek and estimate oil-gas Layer, solved a series of difficult geological.Simultaneously, logging technique is still carried out the important means of the mineral resources exploration such as coal, metal, and is extended to engineering and other field.

Logging system mainly is comprised of downhole logging instruments, depth calibrator, logging truck and logging ground computer system etc.When carrying out logging operation, logging truck utilizes the cable that twines on its cable wheel disc that downhole logging instruments is put into the down-hole.In this process, the code wheel on the logging truck is the depth of feedback signal regularly; Tensiometer sampling feedback cable tension signal TEN; Magnetic mark probe sampling output magnetic mark MMD; Casing coupling probe sampling feedback box cupling detection signal CCL etc.Receive above-mentioned sampled feedback signal by depth calibrator, to calculate the residing well depth of current downhole logging instruments position.

Whether depth calibrator is directly connected to the correctness of log data to the Measurement accuracy of depth of falling well.The forward and backward pulse signal that present depth calibrator is only exported according to code wheel on the cable wheel disc, obtain the degree of depth of transferring of logger by calculating umber of pulse, and the factors such as cable tension, cable tensile strain, cable wheel disc abrasion condition are not taken into account, therefore, the depth-logger value of calculating thus obviously is inaccurate, thereby so that the accuracy of log data be subject to having a strong impact on.

Summary of the invention

The object of the present invention is to provide the depth-logger correction calculation method in a kind of logging system, on the basis of the depth-logger value that the forward and backward pulse signal that utilizes the code wheel feedback calculates, carry out cable wheel disc wearing and tearing correction and cable tensile strain correction, thereby can improve the accuracy of depth-logger value.

For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:

Depth-logger correction calculation method in a kind of logging system, described logging system comprises downhole logging instruments, depth calibrator and logging truck, described logging truck is put into the down-hole by the cable that twines on its cable wheel disc with downhole logging instruments, and the code wheel that arranges on the cable wheel disc is according to the rotating situation output forward and backward pulse signal of cable wheel disc; The forward and backward pulse signal of described depth calibrator received code wheel output, and count respectively; Then, carry out following depth-logger value aligning step:

A, calculating cable wheel disc wearing and tearing correction factor cor_fac:

cor_fac=1000.0/depth_raw;

depth_raw=depth_raw_0/fscale;

Wherein, fscale is cable wheel disc when transferring the cable of unit length, the theoretical umber of pulse of code wheel output; The difference of the forward and backward counted number of pulses of described code wheel when depth_raw_0 is 1000 meters of actual walkings of cable;

B, calculating cable tensile strain correction stretch:

stretch=length*((0.5*length*k2)+k1);

k1=tool_weight_fluid*es_coef;

k2=cable_weight_fac*es_coef;

Wherein, length is the counted number of pulses of the corresponding code wheel output of length of current undeformed cable; Tool_weight_fluid by on the cable the weight of extension downhole logging instruments in down-hole slurry; Cable_weight_fac is downhole cable weight correction coefficient; Es_coef is the cable tensile strain coefficient;

C, calculating depth-logger value corrected_depth:

corrected_depth=(depth_xcal+stretch)/fscale;

depth_xcal=depth_xraw*cor_fac

Wherein, depth_xraw is the forward counted number of pulses of present encoding wheel output and the difference of inversion pulse count value.

Further, described length can be calculated by following formula and obtain:

length=depth_xcal-es_coef*∑((Δdepth)*tension);

Wherein, es_coef is the cable tensile strain coefficient; Δ depth is the counted number of pulses variable quantity of code wheel output in the unit interval, and ∑ (Δ depth)=depth_xcal, and tension is the pulling force on this unit interval cable.

Preferably, the pulling force of described cable can export described depth calibrator to by the tensiometer sampling that is arranged on the cable wheel disc.

Further again, described tool_weight_fluid, cable_weight_fac can adopt following formula to calculate and obtain:

tool_weight_fluid=tool_weight_air-(tool_volume*mud_weight);

cable_weight_fac=(cable_weight_mud/fscale)/1000;

cable_weight_mud=cable_weight_air-(cable_volume*mud_weight);

Wherein, tool_weight_air is the aerial weight of downhole logging instruments; Tool_volume is the volume of downhole logging instruments; Mud_weight is the mud weight of down-hole unit volume; Cable_weight_air is 1000 meters aerial weight of cable; Cable_volume is the volume of 1000 meters cables.

Further, at the inner photoelectric encoder that adopts of described code wheel, the motion of cable wheel disc drives the code wheel rotation and causes photoelectric encoder output A, B phase differential signal; Described A, B phase differential signal are resolved after being converted to single-ended A, B phase signals, if A leading B 90 degree mutually mutually then represent cable wheel disc forward, output forward pulse signal; If B is leading A phase 90 degree mutually, then represent the counter-rotating of cable wheel disc, output inversion pulse signal.

Preferably, A, the B phase differential signal by described photoelectric encoder output is converted to single-ended A, B phase signals through differential signal receiving circuit; Wherein, the A phase signals transfers to respectively first input end and the second clock end of a bistable state d type flip flop, and the B phase signals transfers to respectively the second input and the first clock end of described bistable d flip-flop; The pulse signal of the first output output by described bistable d flip-flop and described A, B phase signals carry out with computing after, export the inversion pulse signal; The pulse signal of the second output output by described bistable d flip-flop and described A, B phase signals carry out with computing after, export the forward pulse signal.

Wherein, described depth calibrator utilizes its inner degree of depth/tension force module to come the forward and backward pulse signal of received code wheel output, and calculates depth-logger value corrected_depth; In order to improve system's reliability of operation, the present invention has adopted the hot backup treatment technology to the described degree of depth/tension force module, the two groups of described degree of depth/tension force modules namely are set in integrated depth measuring instrument simultaneously, the sampled signal fed back of received code wheel and tensiometer simultaneously, and carry out the correction calculation of described depth-logger value corrected_depth.

Further, in the described degree of depth/tension force module, include MCU, CPLD, tension force processing module and A/D converter; Described tension force processing module receives the cable tension signal of tensiometer sampling feedback, exports A/D converter to and carries out exporting described CPLD to after the analog-to-digital conversion; The sampled signal of described CPLD received code wheel output, and align, the inversion pulse signal counts; MCU reads count value and the cable tension signal among the CPLD, to carry out the correction calculation of depth-logger value corrected_depth.

In order to realize the real-time data communication between described integrated depth measuring instrument and the logging system main frame, in described depth calibrator, also be provided with the high-speed CPU module that adopts the PC104 structure, described CPU module connects described CPLD by the PC104 bus, read the cable tension signal of forward and backward pulse count signal value among the CPLD and tensiometer feedback, carry out simultaneously the correction calculation of depth-logger value corrected_depth, and be connected communication with the main frame of logging system, to eliminate the depth difference between the two.

Compared with prior art, advantage of the present invention and good effect are: the basis of depth-logger correction calculation method of the present invention count value of the pulse signal of code wheel output on the cable wheel disc is carried out wearing and tearing correction and the cable tensile strain of cable wheel disc and is proofreaied and correct, thereby can obtain more accurately depth-logger value, and then for obtaining accurately log data provides support, can satisfy well present logging operation requirement.Meanwhile, by the key signal processing module in the logging system being adopted the hot backup technology, thereby improve system's reliability of operation, guaranteed the device security of logging operation.

After reading by reference to the accompanying drawings the detailed description of embodiment of the present invention, other characteristics of the present invention and advantage will become clearer.

Description of drawings

Fig. 1 is the flow chart of depth-logger correction calculation method proposed by the invention;

Fig. 2 is the schematic block circuit diagram that the sampled signal of code wheel output is converted to the forward and backward pulse signal;

Fig. 3 is code wheel A among Fig. 2, B phase signals parser circuitry;

Fig. 4 is the system architecture diagram of the depth calibrator in the logging system.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in more detail.

In the logging operation of reality, we find that iff calculate the degree of depth that downhole logging instruments transfers according to the counted number of pulses of the code wheel output that arranges on the logging truck cable wheel disc be inaccurate, the factors such as abrasion condition of cable tension, cable tensile strain, cable wheel disc must be taken into account and carry out COMPREHENSIVE CALCULATING, just can be met the depth-logger value of requirement.The present invention combines the empirical formula of accumulation in theory calculating and the long-term well logging and sets up Mathematical Modeling, thereby so that the calculating of depth-logger has reached the very high degree of accuracy.

Elaborate the correction calculation method of depth-logger in the described logging system below by a specific embodiment, and the concrete assembling structure that is used for carrying out the depth calibrator of described depth-logger correction calculation method.

Embodiment one, and referring to shown in Figure 1, the depth-logger correction calculation method of the present embodiment may further comprise the steps:

The signal that is used for reflection cable wheel disc motion conditions that code wheel is exported on S101, the collection cable wheel disc is also resolved;

In the present embodiment, if code wheel adopts photoelectric encoder to come the rotation distance of detection streamer wheel disc, i.e. motion by the cable wheel disc drives the code wheel rotation, to cause photoelectric encoder output sampled signal.Because the signal of photoelectric encoder output is generally differential signal, and comprises A, B two-phase, after therefore described A, B phase differential signal need to being changed, resolve, processed, could generate needed forward and backward pulse signal.Specifically, should at first described A, B phase differential signal be converted to single-ended A, B phase signals, then resolve, if A leading B 90 degree mutually mutually then represent cable wheel disc forward, output forward pulse signal; Otherwise, if B leading A 90 degree mutually mutually then represent the counter-rotating of cable wheel disc, output inversion pulse signal.

The present embodiment adopt special hardware circuit come to original A, the B phase differential signal of photoelectric encoder output change, dissection process, to decomposite independently forward and backward pulse signal, be used for the correction calculation of depth-logger value.Specifically, at first A, B phase differential signal ENC A+/ENC A-, the ENC B+/ENC B-with photoelectric encoder output transfers to a differential signal receiving circuit, generates single-ended A, B phase signals with conversion; Then transfer to code wheel A, B phase signals parser circuitry, to resolve the inversion pulse signal DOWN that generates the forward pulse signal UP that represents cable wheel disc forward and represent the counter-rotating of cable wheel disc, referring to shown in Figure 2.Described differential signal receiving circuit and code wheel A, B phase signals parser circuitry can specifically be arranged in the degree of depth of depth calibrator inside/tension force module.Wherein, code wheel A, B phase signals parser circuitry can adopt the large-scale digital ic CPLD design in the described degree of depth/tension force module to realize.

Fig. 3 is a kind of hardware design mode of described code wheel A, B phase signals parser circuitry, comprises a bistable d flip-flop DFLIP-FLOPS and two and door AND1, an AND2.Wherein, transfer to respectively first input end 1D and the second clock end 2CLK of described bistable d flip-flop DFLIP-FLOPS by the A phase signals of differential signal receiving circuit output, the B phase signals transfers to respectively the second input 2D and the first clock end 1CLK of described bistable d flip-flop DFLIP-FLOPS.Described and door AND1 with the pulse signal of the output of the first output 1QN by described bistable d flip-flop DFLIP-FLOPS and described A, B phase signals carry out with computing after, export inversion pulse signal DOWN; With door AND2 with the pulse signal of described A, B phase signals and the second output 2QN output by described bistable d flip-flop DFLIP-FLOPS carry out with computing after, output forward pulse signal UP has just realized the parsing output to the photoelectric encoder output signal thus.

Certainly, if directly adopt the code wheel with forward and backward output of pulse signal function to come the rotation distance of detection streamer wheel disc, then can save top conversion, resolving.

S102, forward pulse signal and inversion pulse signal are counted respectively, and recording gauge numerical value;

In the present embodiment, can adopt specifically that hardware counter in Micro-processor MCV in the depth calibrator or the CPLD aligns, the inversion pulse signal is counted respectively.The circuit design principle figure that Fig. 2 carries out the forward and backward step-by-step counting for 16 digit counters that adopt among the CPLD.

S103, the count value that step S102 is obtained are proofreaied and correct;

The present embodiment is proofreaied and correct according to the parameter of the size of cable wheel disc and photoelectric encoder and in conjunction with factors such as current cable weight, the tension force on the cable, the mud weight, the wearing and tearing of cable wheel disc in the oil well, calculates the count value after the correction.Its main correction calculation process is as follows:

1. the wearing and tearing of cable wheel disc are proofreaied and correct:

Because the manufacturing process of cable wheel disc and the wearing and tearing that the cable wheel disc in use produces can make the girth of cable wheel disc change.That is to say, the cable wheel disc rotates the cable length in a week can be inconsistent with theoretical value, therefore, need to revise theoretical value.Its correction factor is:

cor_fac=1000.0/(1000.0-encoder_calibration)????(1)

Wherein, when encoder_calibration is 1000 meters of cable movement standards on the logging cable wheel disc and by according to the difference between the calculation of parameter theoretical value out of cable wheel disc size and code wheel, this value generally is to be obtained by actual measurement.Wherein, described theoretical value is the actual output of the code wheel value of calculating, can represent with depth_raw, and

depth_raw=depth_raw_0/fscale??????????(2)

In the formula (2), fscale is cable wheel disc when transferring the cable of unit length, the theoretical umber of pulse of code wheel output, and unit be/meter; When depth_raw_0 is 1000 meters of actual walkings of cable, the difference of the forward and backward counted number of pulses of described code wheel output.

Hence one can see that: encoder_calibration=1000.0-depth_raw, and substitution formula (1) can be reduced to formula (1):

cor_fac=1000.0/depth_raw????????????(3)。

2. cable tensile strain is proofreaied and correct:

Because when carrying out logging operation, cable needs to hang the downhole logging instruments of several tons of weights in vertical direction, these weight meetings are so that cable generation deformation stretching, and the cable own wt also can produce cable deformation on the vertical direction, thereby so that the absolute depth position at downhole logging instruments place change.Therefore, must owing to the change in length that cable tensile strain causes is taken into account, just can obtain more accurate, the real place of downhole logging instruments depth value.Its cable tensile strain is proofreaied and correct correction:

stretch=length*((0.5*length*k2)+k1)????(4)

Wherein, length is the counted number of pulses of the corresponding code wheel output of length of current undeformed cable.Because the power that cable wheel disc and cable contact point place cable are subject to has produced deformation, so that therefore cable wheel disc rotation length and be not equal to the length of undeformed cable, must be got rid of this part deformation length, just can obtain the length of undeformed cable, namely

length=depth_xcal-es_coef*∑((Δdepth)*tension)????(5)

In the formula (5), depth_xcal is the value that obtains after the count value process cable wheel disc wearing and tearing of present encoding wheel are proofreaied and correct, i.e. depth_xcal=depth_xraw*cor_fac; Wherein, depth_xraw is the difference of the forward and backward counted number of pulses that counts to get among the step S202.Es_coef is the cable tensile strain coefficient, contains to mean to add the deformation length that cable produces after 1 kilogram on the unit length cable, and this value is provided or recorded by test by cable manufacturer, and unit is meter/(meter per kilogram).Δ depth is the counted number of pulses variable quantity of code wheel output in the unit interval, and ∑ (Δ depth)=depth_xcal; Tension is the pulling force on this unit interval inner cable, and unit is kilogram.

Illustrate: if the descending T of current cable constantly, described T is divided into the N five equilibrium constantly, N is natural number, then unit interval t=T/N.Hence one can see that:

Σ ( Δdepth * tension ) = Σ i = 1 N ( Δ depth i * tension i ) - - - ( 6 )

Wherein, Δ depth iIt is the counted number of pulses variable quantity of code wheel output in i t time; Tension iBe i the pulling force on the t time inner cable.Described cable tension can be obtained by the tensiometer sampling that is arranged on the cable wheel disc.N is larger, and it is more accurate to calculate.

In the present embodiment, k1, the k2 in the formula (4) can adopt following formula to calculate acquisition:

k1=tool_weight_fluid*es_coef????(7)

k2=cable_weight_fac*es_coef?????(8)

In the formula (7), tool_weight_fluid by on the cable the weight of extension downhole logging instruments in down-hole slurry (liquid), and

tool_weight_fluid=tool_weight_air-(tool_volume*mud_weight)??(9)

Wherein, tool_weight_air is the aerial weight of downhole logging instruments, and unit is kilogram; Tool_volume is the volume of downhole logging instruments, and unit is cubic meter; Mud_weight is the mud weight of down-hole unit volume, and unit is kilograms per cubic meter.

In the formula (8), cable_weight_fac is downhole cable weight correction coefficient, namely downhole cable code wheel in down-hole slurry (liquid) export each pulse signal the cable weight of corresponding length, namely

cable_weight_fac=(cable_weight_mud/fscale)/1000????(10)

cable_weight_mud=cable_weight_air-(cable_volume*mud_weight)?(11)

In the formula (11), cable_weight_air is 1000 meters aerial weight of cable; Cable_volume is the volume of 1000 meters cables.

S104, calculating depth-logger value;

In the present embodiment, depth-logger value corrected_depth can adopt following formula to calculate acquisition:

corrected_depth=(depth_xcal+stretch)/fscale????(12)

Be the counted number of pulses/when the cable wheel disc is transferred the cable of unit length after the current residing depth-logger value of downhole logging instruments=by step S103 is proofreaied and correct, the theoretical umber of pulse of code wheel output.

The depth-logger value corrected_depth that obtains by above-mentioned correction calculation is more near the actual grade at the downhole logging instruments place in the oil well.

The below is described in detail the concrete assembling structure of the Depth Logging instrument of carrying out above-mentioned depth-logger value correction calculation process.

Referring to shown in Figure 4, the depth calibrator of the present embodiment mainly partly is comprised of CPU module, the degree of depth/tension force module, MMD (magnetic mark) processing module and CCL (casing coupling) processing module etc.Wherein, the CPU module can be separately positioned on the different pcb boards with the degree of depth/tension force module, forms CPU board and the degree of depth/drag board; MMD processing module and CCL processing module can be arranged on the independent pcb board altogether, form the MMD/CCL disposable plates.Each piece pcb board is carried out different signal processing functions, carries out connecting between plate the measurement task that cooperatively interacts and finish well depth by holding wire or bus.

When carrying out logging operation, downhole logging instruments puts it into the down-hole by the cable that twines on the logging truck.In this process, code wheel on the logging truck can be exported the depth signal that represents code wheel rotation displacement increment, tensiometer output cable pulling force signal TEN, magnetic mark probe sampling output magnetic mark MMD, casing coupling probe sampling feedback box cupling detection signal CCL.Wherein, MMD and CCL transfer to the MMD/CCL disposable plates, amplify, after filtering processes, export the degree of depth/drag board to by the MMD processing module on it and CCL processing module respectively; Depth signal and cable tension signal TEN directly transfer to the degree of depth/drag board, to be used for the correction calculation of depth-logger value.

In the present embodiment, described CPU board preferably adopts the PC104 structure, connect the described degree of depth/drag board by the PC104 bus, with to the degree of depth/drag board sending controling instruction, coordinate the operation between each feature board, and can read at any time the degree of depth/drag board and calculate the depth-logger value that generates, after the request or read signal order that the main frame that receives logging system sends, the depth-logger value is transferred to main frame.

The degree of depth/drag board is mainly finished collection, processing, the counting to the code wheel output signal on the logging truck cable wheel disc, can calculate the girth that the cable wheel disc rotates by these count values, be the length of logging cable motion, thereby learn that logger is in the position of down-hole.

Be provided with MCU, CPLD, tension force processing module and A/D converter at the degree of depth/drag board, as shown in Figure 4.Wherein, the tension force processing module receives the cable tension signal TEN of tensiometer sampling feedback, exports A/D converter to after level conversion is processed.Described A/D converter is mainly finished the analog-to-digital conversion to each road analog sampling passage under the control of CPLD.As shown in Figure 4, the input end of analog signal of A/D converter respectively with the connection corresponding to the MMD/CCL disposable plates of tension force processing module, receive cable tension signal TEN, magnetic mark MMD and box cupling detection signal CCL, and under the control of CPLD, be data signal with analog signal conversion, transfer to CPLD by its digital signal output end.Described CPLD is the signal of received code wheel feedback simultaneously, resolves to generate the forward and backward pulse signal horizontal pulse counting of going forward side by side.MCU is connected communication with described CPLD, reads count value and the cable tension numerical value of CPLD, to carry out the correction calculation of depth-logger value.

Can both finish its sampling task at any time in order to ensure code wheel, the present embodiment is provided with the two-way code wheel simultaneously on logging truck cable wheel disc, and one road code wheel fault does not affect the sampling of another road code wheel.The inner photoelectric encoder that adopts of described depth coding wheel, the motion drive depth coding wheel of logging cable rotates and causes the photoelectric encoder output signal.The two-way photoelectric encoder represents A, the B phase signals that position (degree of depth) changes with the formal output of differential signal, after differential signal receiving circuit amplifies processing, is converted to single-ended A, B phase Transistor-Transistor Logic level signal exports CPLD to.CPLD utilizes its inner direction parser circuitry that A, B phase signals are resolved to the pulse signal that represents cable wheel disc forward and the pulse signal that represents counter-rotating, then sends into counter and counts respectively.The present embodiment is integrated 4 tunnel 16 private counter and timers in CPLD, thereby so that system dimension greatly reduce.Simultaneously, CPLD produces the required frequency clock signal (interrupt signal) of external equipment, this frequency values writes CPLD by degree of depth TT﹠C software by the PC104 bus, and timer becomes required frequency output according to the frequency values that writes with the fundamental frequency frequency division, and frequency range can be at 0~255ms.

MCU is mainly used in 4 tunnel degree of depth up-downgoing pulse signals of two code wheels of output after the CPLD decomposition are counted respectively, and then obtains absolute depth-logger value, velocity amplitude and tension value by correction calculation.Described MCU can be directly connects CPU board by serial ports, carry out communication with CPU board, receives the configuration datas such as the degree of depth that CPU board issues, tension force, and absolute measuring well depth value, velocity amplitude and the tension value that produces is uploaded to CPU board.CPU board also can read each road sampled signal that CPLD processes by the PC104 bus simultaneously, such as the forward and backward counted number of pulses that represents the degree of depth and cable stretch signal etc., independently calculate depth-logger value and tension value etc. by the software that moves on the CPU module oneself.

Simultaneously, MCU can also export the depth increments pulse that sets by CPLD to main frame in real time according to the setting of logging system main frame, wheel 1 depth increments output pulse signal as shown in Figure 4 and wheel 2 depth increments output pulse signals.The depth calibrator of the present embodiment can be set by the user the size of depth increments value, and in real time output is decomposed and proofreaied and correct good any depth increments value pulse, i.e. the every mobile set depth of downhole logging instruments, and MCU just exports a depth increments pulse.The difference of the accumulation degree of depth of the absolute measuring well depth value of having proofreaied and correct that the program judgement among the MCU is current and the depth increments pulse of having exported, when depth increments value that this difference is set more than or equal to the user, MCU just exports a pulse (forward or reverse) by the I/O port, and then exports main frame to by CPLD.This mode has guaranteed to output to the accumulation degree of depth of the depth increments pulse gained of host computer system can be suitable with the absolute depth of having proofreaied and correct (being the depth-logger value that this measuring instrument calculates), thereby eliminate the depth difference between main frame and the depth calibrator.And, adopt the size that this method user can Set arbitrarily depth increments value, with cache oblivious such as employed photoelectric encoder parameter and cable wheel disc sizes.

These two kinds of degree of depth way of outputs can satisfy the requirement of various well logging projects, can with the Halliburton IQ of main flow now, HH-2580, LEAP800, LEAP600, the domestic well logging ground-based system such as HH-2530 is realized articulating.

Because depth value, velocity amplitude, tension value are vital several values in oil well logging, are directly connected to the device security of logging operation.In order to improve depth survey instrument system reliability of operation, the present embodiment has adopted the hot backup treatment technology to the described degree of depth/drag board, the two described degree of depth/drag boards 1,2 namely are set in depth calibrator simultaneously, as shown in Figure 4, receive simultaneously each road sampled feedback signal and carry out the correction calculation of depth-logger value.Identical on the sub-hardware of two boards, use wire jumper to distribute different product id, be the base address of plank I/O mouth, two degree of depth/drag boards 1,2 are worked under same PC104 bus simultaneously, and CPU board can be accessed the data of this two boards of read-write at any time.The data that when a plank has problem, can adopt an other plank to process.

By two degree of depth/drag boards 1,2 depth increments output of pulse signal to selector switches that generate, such as plate shown in Figure 41, plate 2 selector switches, select the depth increments output of pulse signal of a wherein plate output to main frame by described selector switch.

For the integrated depth measuring instrument of realizing the present embodiment and the high speed real-time communication of logging system main frame, CPU board is connected with the gpib interface plate by the PC104 bus, as shown in Figure 4, and then be connected communication by gpib interface with the main frame of logging system, institute's all information of gathering and calculating are stamped time mark send to main frame, but the also various parameters of Receiving Host transmission simultaneously.

Certainly, CPU board also can be by the communication that is connected of the realization of RS232 serial ports and main frame, and the present embodiment is not limited in above giving an example.

In addition, the present embodiment such as the degree of depth, speed, tension force etc., has adopted various ways to show some the crucial values in the during well logging.As shown in Figure 4, adopt touch display screen as basic display unit, connect described CPU board; CPU board connects well head display unit RFD by the RS232/485 serial ports simultaneously.Adopt two undersized liquid crystal displays to connect one to one with two degree of depth/drag boards 1,2 respectively, specifically can connect the MCU on the degree of depth/drag board 1,2, with data such as display depth, speed, tension force.In system's course of normal operation, not only at the host liquid crystal screen demonstration is arranged, on two little liquid crystal displays, demonstration is arranged also.Any screen breaks down and can not affect the demonstration of other screen, thereby has guaranteed that operating personnel can both obtain the important information in the during well logging at any time, and then has guaranteed the safety operation of well logging.

Meanwhile, the depth calibrator of the present embodiment also has the winch brake function, and according to setting, when the depth value that calculates or value of thrust transfinited, the cable wheel disc self-actuating brake of output signal control logging truck was to guarantee the safe operation of whole system.

Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.

Claims (10)

1. the depth-logger correction calculation method in the logging system, described logging system comprises downhole logging instruments, depth calibrator and logging truck, described logging truck is put into the down-hole by the cable that twines on its cable wheel disc with downhole logging instruments, and the code wheel that arranges on the cable wheel disc is according to the rotating situation output forward and backward pulse signal of cable wheel disc; It is characterized in that: the forward and backward pulse signal of described depth calibrator received code wheel output, and count respectively; Then, carry out following depth-logger value aligning step:
A, calculating cable wheel disc wearing and tearing correction factor cor_fac:
cor_fac=1000.0/depth_raw;
depth_raw=depth_raw_0/fscale;
Wherein, fscale is cable wheel disc when transferring the cable of unit length, the theoretical umber of pulse of code wheel output; The difference of the forward and backward counted number of pulses of described code wheel when depth_raw_0 is 1000 meters of actual walkings of cable;
B, calculating cable tensile strain correction stretch:
stretch=length*((0.5*length*k2)+k1);
k1=tool_weight_fluid*es_coef;
k2=cable_weight_fac*es_coef;
Wherein, length is the counted number of pulses of the corresponding code wheel output of length of current undeformed cable; Tool_weight_fluid by on the cable the weight of extension downhole logging instruments in down-hole slurry; Cable_weight_fac is downhole cable weight correction coefficient; Es_coef is the cable tensile strain coefficient;
C, calculating depth-logger value corrected_depth:
corrected_depth=(depth_xcal+stretch)/fscale;
depth_xcal=depth_xraw*cor_fac;
Wherein, depth_xraw is the forward counted number of pulses of present encoding wheel output and the difference of inversion pulse count value.
2. depth-logger correction calculation method according to claim 1 is characterized in that: described length is calculated by following formula and obtains:
length=depth_xcal-es_coef*∑((Δdepth)*tension);
Wherein, es_coef is the cable tensile strain coefficient; Δ depth is the counted number of pulses variable quantity of code wheel output in the unit interval, and ∑ (Δ depth)=depth_xcal, and tension is the pulling force on this unit interval cable.
3. depth-logger correction calculation method according to claim 2 is characterized in that: the pulling force of described cable exports described depth calibrator to by the tensiometer sampling that is arranged on the cable wheel disc.
4. depth-logger correction calculation method according to claim 1 is characterized in that: described tool_weight_fluid is calculated by following formula and obtains:
Tool_weight_fluid=tool_weight_air-(tool_volume*mud_weight); Wherein, tool_weight_air is the aerial weight of downhole logging instruments; Tool_volume is the volume of downhole logging instruments; Mud_weight is the mud weight of down-hole unit volume.
5. depth-logger correction calculation method according to claim 1 is characterized in that: described downhole cable weight correction coefficient cable_weight_fac is calculated by following formula and obtains:
Cable_weight_fac=(cable_weight_mud/fscale)/1000; Cable_weight_mud=cable_weight_air-(cable_volume*mud_weight); Wherein, cable_weight_air is 1000 meters aerial weight of cable; Cable_volume is the volume of 1000 meters cables; Mud_weight is the mud weight of down-hole unit volume.
6. depth-logger correction calculation method according to claim 1 is characterized in that: at the inner photoelectric encoder that adopts of described code wheel, the motion of cable wheel disc drives code wheel and rotates and cause photoelectric encoder output A, B phase differential signal; Described A, B phase differential signal are resolved after being converted to single-ended A, B phase signals, if leading B phase signals 90 degree of A phase signals then represent cable wheel disc forward, output forward pulse signal; If leading A phase signals 90 degree of B phase signals then represent the counter-rotating of cable wheel disc, output inversion pulse signal.
7. depth-logger correction calculation method according to claim 6 is characterized in that: A, B phase differential signal by described photoelectric encoder output are converted to single-ended A, B phase signals through differential signal receiving circuit; Wherein, the A phase signals transfers to respectively first input end and the second clock end of a bistable state d type flip flop, and the B phase signals transfers to respectively the second input and the first clock end of described bistable d flip-flop; The pulse signal of the first output output by described bistable d flip-flop and described A, B phase signals carry out with computing after, export the inversion pulse signal; The pulse signal of the second output output by described bistable d flip-flop and described A, B phase signals carry out with computing after, export the forward pulse signal.
8. each described depth-logger correction calculation method in 7 according to claim 1, it is characterized in that: described depth calibrator utilizes its inner degree of depth/tension force module to come the forward and backward pulse signal of received code wheel output, and calculates depth-logger value corrected_depth; The described degree of depth/tension force module is provided with two groups, the sampled signal fed back of received code wheel and tensiometer simultaneously, and carry out the correction calculation of described depth-logger value corrected_depth.
9. depth-logger correction calculation method according to claim 8 is characterized in that: include MCU, CPLD, tension force processing module and A/D converter in the described degree of depth/tension force module; Described tension force processing module receives the cable tension signal of tensiometer sampling feedback, exports A/D converter to and carries out exporting described CPLD to after the analog-to-digital conversion; The sampled signal of described CPLD received code wheel output, and align, the inversion pulse signal counts; MCU reads count value and the cable tension signal among the CPLD, to carry out the correction calculation of depth-logger value corrected_depth.
10. depth-logger correction calculation method according to claim 9, it is characterized in that: in described depth calibrator, also be provided with the high-speed CPU module that adopts the PC104 structure, connect described CPLD by the PC104 bus, read the cable tension signal of forward and backward pulse count signal value among the CPLD and tensiometer feedback, carry out simultaneously the correction calculation of depth-logger value corrected_depth, and be connected communication with the main frame of logging system.
CN 201010513894 2010-10-11 2010-10-11 Logging depth correction computation method in logging system CN102003172B (en)

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