CN108571316B - Method and device for correcting logging depth without cable - Google Patents

Abstract

The invention discloses a cableless logging depth correction method and device. The method includes: comparing the cementing logging magnetic positioning curve with the actual casing collar depth by using the correlation coefficient method to obtain the cementing logging depth correction According to the correction value of the cementing logging depth, the magnetic positioning curve of the cementing logging and the GR correlation curve of the cementing logging are corrected to obtain the corrected GR depth of the cementing logging; Depth correction is performed on the corrected cementing logging GR depth to determine the correction amount of open-hole GR logging depth; according to the correction amount of open-hole GR logging depth, the GR depth of open-hole logging and the correlation curve of open-hole logging are corrected. The problem of difficult depth correction and large correction errors in cableless logging of highly deviated wells or horizontal wells in the prior art is solved.

Description

A cableless logging depth correction method and device

technical field

The invention relates to the technical field of petroleum logging, in particular to a cableless logging depth correction method and device based on casing collars.

Background technique

In the field of petroleum exploration, for straight wells or wells with a deviation of less than 40 degrees, ordinary wireline logging can complete the construction tasks. That is, use the natural gamma curve (GR) as the depth control curve, and measure a GR curve for each measurement, and use the depth of the GR curve of a certain measurement as the benchmark to align the depth of the curves of each measurement, different measurement curves The amount of depth shift between them can be determined only by comparing the natural gamma curves of each measurement, which is why later engineering technology and geological research often normalize the depth to the spontaneous gamma. Therefore, in the case of ordinary wireline logging, the depth correction can be done by matching the depth of the cementing logging curve with the GR curve of the open hole logging.

With the deepening of petroleum exploration and development, the number of complex wells such as horizontal wells or highly deviated wells is increasing, and the difficulty of logging is also increasing. For highly deviated wells, drilling tool delivery logging is required, which is mainly powered by drilling tools, and the entire well section is measured by the drill pipe one string at a time. Due to the large error between the drilling depth system and the logging depth system, it is usually not possible Meet the industry standard: the error of the casing is within (±1‰), and the depth error between the curves of the same well is within 0.25m. Cementing wireline logging can generally be carried out in highly deviated wells. At this time, the depth correction is to make the drilling tool delivery logging curve of the open hole consistent with the depth of the cementing wireline logging GR curve.

However, when the inclination exceeds a certain inclination or is a horizontal well, especially a "upturned" horizontal well, it usually occurs that both the open hole logging and the cementing logging are drilling tool delivery logging. Although cableless logging technology can make up for the shortcomings of conventional logging technology in the field of complex well logging, it is obviously inappropriate to use traditional depth correction methods, because the logging depths of open hole logging and cementing logging are different. Inaccurate. If the depth is not accurate, it will affect the perforation-fracturing effect, and even cause engineering accidents. Therefore, in order to obtain accurate logging curves of horizontal well sections, it is often necessary to further correct the obtained logging curves of horizontal well sections. Therefore, it has also become the focus of current research to overcome the problems of difficult depth correction and large correction errors in cableless logging for highly deviated wells or horizontal wells in the prior art.

Contents of the invention

In view of the above problems, the present invention provides a cableless logging depth correction method and device, which solves the problems in the prior art that the depth correction of highly deviated wells or horizontal wells is difficult and the correction error is large.

In order to achieve the above object, according to the first aspect of the present invention, a cableless logging depth correction method is provided, the method comprising:

Taking the actual casing collar depth as a reference, using the correlation coefficient method to compare the magnetic positioning curve of the cementing logging with the actual casing collar depth to obtain the correction amount of the cementing logging depth;

According to the correction amount of the cementing logging depth, the magnetic positioning curve of the cementing logging and the related curves of the cementing logging GR and the synchronous measurement are corrected to obtain the corrected cementing logging GR and all synchronous measurement curves depth;

Correcting the depth of the open-hole logging GR depth and the corrected cementing logging GR depth to determine the correction amount of the open-hole GR logging depth;

According to the open hole GR logging depth correction amount, the depth of the GR curve of the open hole logging and the correlation curve of the open hole logging is corrected.

Preferably, the actual casing collar depth is used as a reference, and the magnetic positioning curve of the cementing logging is compared with the actual casing collar depth by using the correlation coefficient method to obtain the correction amount of the cementing logging depth, including :

According to each peak depth of the magnetic positioning curve of the cementing logging, the casing top depth value displayed by the magnetic positioning curve is obtained;

Calculate the depth correction amount d _j of the magnetic positioning curve, where, d _j =d _s -d _c , where d _j is the depth correction value of the magnetic positioning curve, d _s is the depth value of the actual casing collar top, d _c is the casing top depth value displayed by the magnetic positioning curve;

Perform depth correction on the magnetic positioning curve according to the depth correction amount of the magnetic positioning curve, obtain the casing top depth value displayed by the corrected magnetic positioning curve, and match the corresponding actual casing collar top depth value A comparison is made to determine whether the comparison value is within the allowable error range, and if so, the depth correction amount of the magnetic positioning curve is used as the cementing logging depth correction amount.

Preferably, according to the correction amount of the cementing logging depth, the magnetic positioning curve of the cementing logging, the cementing logging GR and the related curves of the synchronous measurement are corrected to obtain the corrected cementing logging GR and Depth of all simultaneous measurement curves, including:

According to the correction amount of the cementing logging depth, the magnetic positioning curve of the cementing logging is correspondingly stretched or compressed by adopting a depth adjustment method;

The synchronously measured cementing logging GR and all related curves are corrected to obtain the corrected cementing logging GR and the depth of all synchronously measuring curves.

According to a second aspect of the present invention, a cableless logging depth correction device is provided, the device comprising:

The first acquisition module is used to use the actual casing collar depth as a reference, and use the correlation coefficient method to compare the magnetic positioning curve of the cementing logging with the actual casing collar depth to obtain the cementing logging depth correction amount;

The first correction module is used to correct the magnetic positioning curve of the cementing log, the GR of the cementing log and the related curves of the synchronous measurement according to the correction amount of the cementing logging depth, and obtain the corrected cementing logging Depth of GR and all simultaneous measurement curves;

The second acquisition module is used to correct the depth of the open-hole logging GR depth and the corrected cementing logging GR depth, and determine the correction amount of the open-hole GR logging depth;

The second correction module is configured to correct the depth of the GR curve of the open-hole logging and the relevant curve of the open-hole logging according to the correction amount of the depth of the open-hole GR logging.

Preferably, the first acquisition module includes:

A numerical value acquisition unit, configured to obtain the casing top depth value displayed by the magnetic positioning curve according to each peak depth of the magnetic positioning curve of the cementing logging;

The calculation unit is used to calculate the depth correction amount d _j of the magnetic positioning curve, wherein, d _j =d _s -d _c , where d _j is the depth correction amount of the magnetic positioning curve, and d _s is the actual casing collar The top depth value, d _c is the casing top depth value shown by the magnetic positioning curve;

The judging unit is configured to perform depth correction on the magnetic positioning curve according to the depth correction amount of the magnetic positioning curve, obtain the casing top depth value displayed by the corrected magnetic positioning curve, and compare it with the corresponding actual casing The coupling top depth value is compared to determine whether the comparison value is within the allowable error range, and if so, the depth correction amount of the magnetic positioning curve is used as the cementing logging depth correction amount.

Preferably, the first correction module includes:

The first correction unit is used to perform corresponding curve stretching or compression on the magnetic positioning curve of the cementing logging by adopting the method of depth adjustment according to the correction amount of the cementing logging depth;

The second correction unit, the second correction unit, is used to correct the synchronously measured cementing logging GR and all related curves measured simultaneously, and obtain the corrected cementing logging GR and all synchronously measured curves depth.

Compared with the prior art, the present invention uses the actual casing collar depth as a reference to correct the magnetic positioning curve of the cementing logging, the GR of the cementing logging and the related curves of the synchronous measurement, and at the same time correct the The GR curve and the related curve depth of open hole logging are corrected. Through the correction method provided and used by the present invention, the depth correction when there is no wireline logging in both open hole and cemented well is realized. This method no longer takes any natural gamma ray curve of the two logs of open hole and cementing as the "reference object", but uses the "casing collar" that can reflect the casing depth as the "reference object". The authenticity of the downhole casing length makes the depth correction method more scientific. Finally, the error between the reconstructed logging depth and the actual casing depth is within 0.25m of the set allowable accuracy error, and the depths of various logging results are consistent, and the logging curves consistent with the formation information are output. Hole-Frac provided technical support. The problem of difficult depth correction and large correction errors in the cableless logging of highly deviated wells or horizontal wells in the prior art is solved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic flow chart of a cableless logging depth correction method provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic flow chart of obtaining the cementing logging depth correction amount in step S11 shown in Fig. 1 corresponding to Embodiment 2 of the present invention;

Fig. 3 is a schematic diagram of the basic structure of the magnetic locator in an embodiment of the present invention;

Fig. 4 is a schematic flow diagram of correcting the cementing logging curve in step S12 shown in Fig. 1 corresponding to Embodiment 2 of the present invention;

Fig. 5 is a schematic diagram of logging curve compression in an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a cableless logging depth correction device provided in Embodiment 3 of the present invention;

Fig. 7 is a schematic diagram of the correction amount of cementing GR in the fourth embodiment of the present invention with the depth of the casing collar as the accurate setting;

Fig. 8 is a schematic diagram of the corrected depth of the cementing series based on the depth of the casing collar in the fourth embodiment of the present invention;

Fig. 9 is a diagram of determining the naked eye GR correction amount based on the depth of the casing collar in the fourth embodiment of the present invention;

Fig. 10 is a series of open hole logging curves before correction based on the casing collar depth in Example 4 of the present invention;

Fig. 11 is a series of open-hole logging curves corrected based on the casing collar depth in Example 4 of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The terms "first" and "second" in the specification and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. 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 comprising a series of steps or units is not defined by listed steps or units, but may include unlisted steps or units.

Embodiment one

Referring to Fig. 1, it is a schematic flowchart of a cableless logging depth correction method provided by Embodiment 1 of the present invention, the method includes the following steps:

S11. Taking the actual casing collar depth as a reference, using the correlation coefficient method to compare the magnetic positioning curve of the cementing logging with the actual casing collar depth to obtain the correction amount of the cementing logging depth;

Specifically, the "casing collar" that can reflect the casing depth is selected as the "reference object", and the actual depth of each casing (casing collar depth) is used as the reference, and the magnetic positioning curve of cementing logging Perform depth correction. The main function of the cementing magnetic positioning curve is to locate the casing collar, which is peak-shaped at the casing collar, and the distance between two adjacent peaks is equivalent to the length of a casing. There is a one-to-one correspondence between the casing collar depth reflected by the peak of the cementing magnetic positioning curve and the downhole casing length measured on the ground.

S12. According to the correction amount of the cementing logging depth, correct the magnetic positioning curve of the cementing logging, the related curves of the cementing logging GR and the synchronous measurement, and obtain the corrected cementing logging GR and all synchronous measurements the depth of the curve;

S13. Correct the depth of the open hole logging GR and the corrected cementing logging GR depth, and determine the correction amount of the open hole GR logging depth;

S14. Correct the depth of the GR curve of the open-hole logging and the correlation curve of the open-hole logging according to the correction amount of the depth of the open-hole GR logging.

Through the technical solution disclosed in Embodiment 1 of the present invention, the "casing collar" that can reflect the depth of the casing is selected as the "reference object", and the related curves of the cementing logging curve and the open hole logging are respectively corrected, making the correction more accurate. Accurate, solves the problems of difficult depth correction and large correction errors in cableless logging for highly deviated wells or horizontal wells in the prior art.

Embodiment two

Referring to Embodiment 1 of the present invention and the specific process of steps S11 to S14 described in FIG. 1 , FIG. 2 is a schematic flowchart of the cementing logging depth correction amount in step S11 shown in FIG. 1 corresponding to Embodiment 2 of the present invention , this step specifically includes:

S111. According to each peak depth of the magnetic positioning curve of the cementing logging, obtain the casing top depth value displayed by the magnetic positioning curve;

It can be understood that the magnetic positioning curve is measured by the magnetic locator, and the logging principle of the magnetic locator is as follows:

The magnetic locator belongs to the magnetic logging series, which is mainly used for depth control to determine the running depth of downhole tools, and is widely used in positioning and perforating. Figure 3 shows the basic structure of the magnetic locator, the core of which is a pair of magnetic steel and coils with opposite magnetic poles. When logging, the instrument is lowered into the casing, tubing or other strings. At this time, the distribution of magnetic force lines is stable. When the instrument goes from (a) to (d) along the string, if it encounters a collar, packer or water distributor, The distribution of the magnetic lines of force will change, so the magnetic flux passing through the coil will also change and generate an induced electromotive force in the coil. According to the law of electromagnetic induction, the magnitude of the electromotive force is determined by the following formula:

In the above formula, ε is the induced electromotive force generated at both ends of the coil; K is the proportional coefficient; Φ is the magnetic flux; t is the time.

The signal measured by the magnetic locator is shown in Fig. 3(e). The position of the casing collar is at the peak in Fig. 3(e). The continuous magnetic positioning curve in the well can be measured by the magnetic locator, which can accurately determine the position of the casing. Collar depth.

S112. Calculate the depth correction amount d _j of the magnetic positioning curve, where d _j =d _s -d _c , where d _j is the depth correction amount of the magnetic positioning curve, and d _s is the actual casing collar top depth value , _dc is the casing top depth value displayed by the magnetic positioning curve;

Specifically, the actual casing collar top depth value should correspond to the casing top depth value displayed by the magnetic positioning curve, and the depth difference between the two is the depth correction amount of the magnetic positioning curve;

S113. Perform depth correction on the magnetic positioning curve according to the depth correction amount of the magnetic positioning curve, obtain the casing top depth value displayed by the corrected magnetic positioning curve, and compare it with the corresponding actual casing collar top Compare the depth values to determine whether the comparison value is within the allowable error range, and if so, use the depth correction amount of the magnetic positioning curve as the cementing logging depth correction amount.

Usually, the correction amount should meet the industry standard: the error of the casing is within (±1‰), and the depth error between the curves of the same well is within 0.25m, so as to judge the accuracy of the correction. Specifically, in the second embodiment, the correlation function method is used to compare the depth of the magnetic positioning curve reflecting the depth of the casing collar in the cementing logging with the actual depth of the casing to determine the correction amount of the cementing logging depth:

For the two logging curves for depth correction, it is equivalent to two discrete sequences x _n , y _n of equal length, each with N sampling points, and the depth of the same layer of the two curves is determined by the degree of linear correlation between them Is it the same. The standardized correlation function method can be used to describe the degree of correlation between the two.

Standardized correlation function r _xy :

In the formula:

The correlation function defined above is based on the fixed length of x _n and y _n to compare the depth of two curves. It is carried out under a certain depth displacement, that is, to study the similarity of the two curves in translation.

Referring to Fig. 4, it is a schematic flow diagram of correcting the cementing logging curve in step S12 shown in Fig. 1 corresponding to Embodiment 2 of the present invention, and step S12 specifically includes:

S121. According to the correction amount of the cementing logging depth, the magnetic positioning curve of the cementing logging is correspondingly stretched or compressed by adopting a depth adjustment method;

S122. Correct the synchronously measured cementing log GR and all related curves measured simultaneously, and obtain the corrected cementing log GR and the depth of all synchronously measured curves.

Specifically, compressing or stretching the depth of certain intervals of the logging curve is what is commonly called depth adjustment. For example, if the top-bottom depth interval d ₂₂ -d ₂₁ of a certain section of the comparison curve is greater than the depth interval d ₁₂ -d ₁₁ between the same section of the basic curve, then the logging interval between d ₂₂ -d ₂₁ should be The data should be compressed into the same depth interval of d ₁₂ -d ₁₁ ; otherwise, the logging data in a certain section of the comparison curve should be increased to elongate the curve by increasing the sampling interval.

The following takes deep compression as an example to illustrate. As shown in Figure 5, curve C ₁ is a reference curve, and curve C ₂ is a comparison curve. After comparison, the curve part of the depth of the curve C ₂ in the interval d ₂₂ ~ d ₂₁ is equivalent to that of the depth of the curve C ₁ in the interval d ₁₁ ~ d ₁₂ , but there is a difference between the depths︱d ₂₂ -d ₂₁ ︱>︱d ₁₂ - d ₁₁ |. Therefore, the C ₂ curve of the interval d ₂₂ ~ d ₂₁ should be compressed.

The basic steps in performing this depth adjustment are:

First find out the depth d _y corresponding to the sampling depth d _x of the curve depth C ₁ on the curve C ₂ ,

because:

so

d ₁₁ , d ₁₂ , d ₂₁ , and d ₂₂ have been determined through curve comparison, and d _x is selected by C ₁ .

Find out the logging values V _i and V _i+1 of the adjacent sampling points (i, i+1) before and after point y from the logging data of curve C ₂ according to d _y , and use the method of linear interpolation to calculate the value of point y Logging value V _y :

Move d _x successively according to the sampling interval, and obtain d _y and V _y respectively from formulas (1-1) and (1-2).

Corresponding steps S13 and S14 may also refer to the above detailed description to perform corresponding operations.

According to the technical solution disclosed in Embodiment 2 of the present invention, by comparing the magnetic positioning curve with the casing collar, the continuous magnetic positioning curve in the well can be measured by the magnetic locator, the depth of the casing collar can be accurately determined, and the correction The amount meets the error requirements, and the correction amount is finally determined by the correlation function method, and the curve is corrected by compressing or stretching the curve, making the correction more accurate, and solving the problem of cableless wells in highly deviated wells or horizontal wells in the prior art. The depth correction of logging is difficult and the correction error is large.

Embodiment three

Corresponding to the cableless logging depth correction methods disclosed in the first and second embodiments of the present invention, the third embodiment of the present invention also provides a cableless logging depth correction device, see Figure 6 for an embodiment of the present invention 3. Schematic diagram of the structure of the cableless logging depth correction device provided, the device includes:

The first acquisition module 1 is used to use the actual casing collar depth as a reference, and use the correlation coefficient method to compare the magnetic positioning curve of the cementing log with the actual casing collar depth to obtain the cementing log Depth correction amount;

The first correction module 2 is used to correct the magnetic positioning curve of the cementing log, the GR of the cementing log and the related curves of the synchronous measurement according to the correction amount of the cementing logging depth, and obtain the corrected cementing logging Depth of well GR and all simultaneous survey curves;

The second acquisition module 3 is used to correct the depth of the open-hole logging GR and the corrected cementing logging GR depth, and determine the correction amount of the open-hole GR logging depth;

The second correction module 4 is configured to correct the depth of the GR curve of the open-hole logging and the correlation curve of the open-hole logging according to the correction amount of the depth of the open-hole GR logging.

Correspondingly, the first acquisition module 1 includes:

The value acquisition unit 11 is used to obtain the casing top depth value displayed by the magnetic positioning curve according to the peak depths of the magnetic positioning curve of the cementing logging;

The calculation unit 12 is used to calculate the depth correction amount d _j of the magnetic positioning curve, wherein, d _j =d _s −d _c , where d _j is the depth correction amount of the magnetic positioning curve, and d _s is the actual casing connection The depth value of the top of the hoop, d _c is the depth value of the top of the casing shown by the magnetic positioning curve;

The judging unit 13 is used to perform depth correction on the magnetic positioning curve according to the depth correction amount of the magnetic positioning curve, obtain the casing top depth value displayed by the corrected magnetic positioning curve, and compare it with the corresponding actual casing top depth value. Compare the depth values at the top of the pipe collar to determine whether the comparison value is within the allowable error range, and if so, use the depth correction amount of the magnetic positioning curve as the cementing logging depth correction amount.

Correspondingly, the first correction module 2 includes:

The first correction unit 21 is used to perform corresponding curve stretching or compression on the magnetic positioning curve of the cementing logging by adopting the method of depth adjustment according to the correction amount of the cementing logging depth;

The second correction unit 22 is configured to correct the depth of the GR curve of the open-hole logging and the correlation curve of the open-hole logging according to the correction amount of the open-hole GR logging depth.

In the third embodiment of the present invention, the depth correction amount of the cementing logging is obtained through the first acquisition module, and at the same time, the correlation curve of the cementing logging is corrected through the first correction module, and a similar method is adopted to realize For the correction of the open-hole logging curve, since the depth of the casing collar is used as the base value, the correction amount is more accurate, and the depth of the logging curve meets the allowable range of error, so that the corrected cementing logging curve and the open-hole logging curve The curve is more accurate, which solves the problems of difficult depth correction and large correction errors in the cableless logging of highly deviated wells or horizontal wells in the prior art.

Embodiment Four

Embodiment 4 of the present invention provides a cableless logging depth correction method in a specific scenario. The selected well A is a shale gas horizontal well, and both the open-hole logging and the cementing logging use drilling tool delivery logging. Taking the 2545-2590m section of the well as an example, taking the actual casing collar depth as the reference, compare the peak depths of the indicated casing collars in the first magnetic positioning curve with the actual casing collar depths. First, compare the most obvious depth of the short casing. It can be seen from Figure 7 that the magnetic positioning curve shows that the short casing has a top depth of 2577.84m and a bottom depth of 2582.85m, and the actual short casing collar has a top depth of 2574.95m and a bottom depth of 2579.96 m, the depth is 2.89m, and the correction value is determined to be -2.89m;

Move the depth of the magnetic positioning curve up by 2.89m. After confirming that the depth is aligned, move up all the curves such as the cementing GR measured synchronously by 2.89m. The pipe pup joint depth (2574.95-2579.96m) is 0.01m deep, within the allowable error of 0.25m, see Figure 8;

Then take the depth of cementing GR after depth correction as the standard, compare the depth of open hole GR with it, and determine the correction amount of open hole GR depth. It can be seen from Fig. 9 that the depth of open hole GR is 1.69 shallower than that of cementing GR after depth correction by coupling m, the naked eye GR depth correction is +1.69m;

Fig. 10 is the logging curve of the open hole logging series before depth correction. The depth of the open hole GR and all the curves measured simultaneously is moved down by 1.69m, so that the depth of the two curves of the open hole GR and the cementing GR after correction are consistent, as shown in Fig. 11. The depth of the casing collar indicated by the magnetic positioning curve after the cementing calibration is consistent with the actual casing collar depth. The depth error of this well section is -0.075m, which is within the allowable error of 0.25m.

In Embodiment 4 of the present invention, taking a specific well section as an example, the method of cableless logging depth correction is described. After the depth correction is based on the "casing collar", the depths of various logging results are consistent. The correction is made more accurate, and the problems of difficult depth correction and large correction errors in the cableless logging of highly deviated wells or horizontal wells in the prior art are solved.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related part, please refer to the description of the method part.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A cableless logging depth correction method is characterized in that the method comprises: Taking the actual casing collar depth as a reference, using the correlation coefficient method to compare the magnetic positioning curve of the cementing logging with the actual casing collar depth to obtain the correction amount of the cementing logging depth; According to the correction amount of the cementing logging depth, the magnetic positioning curve of the cementing logging and the related curves of the cementing logging GR and the synchronous measurement are corrected to obtain the corrected cementing logging GR and all synchronous measurement curves depth; Correcting the depth of the open-hole logging GR depth and the corrected cementing logging GR depth to determine the correction amount of the open-hole GR logging depth; According to the open hole GR logging depth correction amount, the depth of the GR curve of the open hole logging and the correlation curve of the open hole logging is corrected. 2. The method according to claim 1, characterized in that, the actual casing collar depth is used as a reference, and the magnetic positioning curve of cementing logging is compared with the actual casing collar depth by using the correlation coefficient method In comparison, the correction amount of the cementing logging depth is obtained, including: According to each peak depth of the magnetic positioning curve of the cementing logging, the casing top depth value displayed by the magnetic positioning curve is obtained; Calculate the depth correction amount d _j of the magnetic positioning curve, where, d _j =d _s -d _c , where d _j is the depth correction value of the magnetic positioning curve, d _s is the depth value of the actual casing collar top, d _c is the casing top depth value displayed by the magnetic positioning curve; Perform depth correction on the magnetic positioning curve according to the depth correction amount of the magnetic positioning curve, obtain the casing top depth value displayed by the corrected magnetic positioning curve, and match the corresponding actual casing collar top depth value A comparison is made to determine whether the comparison value is within the allowable error range, and if so, the depth correction amount of the magnetic positioning curve is used as the cementing logging depth correction amount. 3. The method according to claim 1, characterized in that, according to the correction amount of the cementing logging depth, the magnetic positioning curve of the cementing logging, the GR of the cementing logging and the correlation curve of the synchronous measurement are carried out. Correction, to obtain the corrected cementing log GR and the depth of all simultaneous measurement curves, including: According to the correction amount of the cementing logging depth, the magnetic positioning curve of the cementing logging is correspondingly stretched or compressed by adopting a depth adjustment method; The synchronously measured cementing log GR and all related curves are corrected to obtain the corrected cementing log GR and the depth of all synchronously measured curves. 4. A cableless logging depth correction device, characterized in that the device comprises: The first acquisition module is used to use the actual casing collar depth as a reference, and use the correlation coefficient method to compare the magnetic positioning curve of the cementing logging with the actual casing collar depth to obtain the cementing logging depth correction amount; The first correction module is used to correct the magnetic positioning curve of the cementing log, the GR of the cementing log and the related curves of the synchronous measurement according to the correction amount of the cementing logging depth, and obtain the corrected cementing logging Depth of GR and all simultaneous measurement curves; The second acquisition module is used to correct the depth of the open-hole logging GR depth and the corrected cementing logging GR depth, and determine the correction amount of the open-hole GR logging depth; The second correction module is configured to correct the depth of the GR curve of the open-hole logging and the relevant curve of the open-hole logging according to the correction amount of the depth of the open-hole GR logging. 5. The device according to claim 4, wherein the first acquiring module comprises: A numerical value acquisition unit, configured to obtain the casing top depth value displayed by the magnetic positioning curve according to each peak depth of the magnetic positioning curve of the cementing logging; The calculation unit is used to calculate the depth correction amount d _j of the magnetic positioning curve, wherein, d _j =d _s -d _c , where d _j is the depth correction amount of the magnetic positioning curve, and d _s is the actual casing collar The top depth value, d _c is the casing top depth value shown by the magnetic positioning curve; The judging unit is configured to perform depth correction on the magnetic positioning curve according to the depth correction amount of the magnetic positioning curve, obtain the casing top depth value displayed by the corrected magnetic positioning curve, and compare it with the corresponding actual casing The coupling top depth value is compared to determine whether the comparison value is within the allowable error range, and if so, the depth correction amount of the magnetic positioning curve is used as the cementing logging depth correction amount. 6. The device according to claim 4, wherein the first correction module comprises: The first correction unit is used to perform corresponding curve stretching or compression on the magnetic positioning curve of the cementing logging by adopting the method of depth adjustment according to the correction amount of the cementing logging depth; The second correction unit is configured to correct the synchronously measured cementing logging GR and all related curves measured simultaneously, and obtain the corrected depth of the cementing logging GR and all synchronously measuring curves.

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