CN-122014230-A - Optical fiber temperature logging depth correction method, device, equipment, medium and product

CN122014230ACN 122014230 ACN122014230 ACN 122014230ACN-122014230-A

Abstract

The embodiment of the application provides a method, a device, equipment, a medium and a product for correcting the depth of an optical fiber temperature well logging, wherein the method comprises the steps of analyzing the form of a distributed optical fiber temperature well logging curve and determining the length range of an optical fiber corresponding to a fluid extraction position; according to the distributed optical fiber temperature logging curve, calculating a temperature gradient curve in an optical fiber length range corresponding to the fluid extraction position, analyzing the temperature gradient curve to determine the fluid extraction position, and correcting the logging depth of the distributed optical fiber temperature logging curve according to the fluid extraction position to obtain corrected logging depth. In the embodiment of the application, the corrected logging depth can provide accurate logging depth for the distributed optical fiber temperature logging curve.

Inventors

ZOU YOULONG
LI JUN
SU JUNLEI
HU SONG
LU JING
LIU MI

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司石油勘探开发研究院

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (11)

1. A distributed optical fiber temperature logging depth correction method, comprising: analyzing the morphology of the distributed optical fiber temperature logging curve, and determining the length range of the optical fiber corresponding to the fluid extraction position; Calculating a temperature gradient curve in the optical fiber length range corresponding to the fluid extraction position according to the distributed optical fiber temperature logging curve; analyzing the temperature gradient curve to determine a fluid extraction position; And correcting the logging depth of the distributed optical fiber temperature logging curve according to the fluid extraction position to obtain corrected logging depth.
2. The method of claim 1, wherein analyzing the morphology of the distributed fiber optic temperature log to determine a range of fiber optic lengths corresponding to fluid production locations comprises: And determining the length range of the optical fiber corresponding to the fluid extraction position according to the morphological change of the distributed optical fiber temperature logging curve and the reference surface temperature value.
3. The method of claim 1, wherein calculating a temperature gradient profile over a length of the optical fiber corresponding to the fluid extraction location from the distributed optical fiber temperature log comprises: Calculating a temperature gradient curve in the optical fiber length range corresponding to the fluid extraction position according to the formula T grad,i ＝(T i-1 -T i+1 )/(2 delta d); Wherein, T grad,i is the temperature gradient value of the ith depth point, T i-1 and T i+1 are the temperature values corresponding to the (i-1) th and (i+1) th depth points in the distributed optical fiber temperature logging curve, and Δd is the sampling interval of the distributed optical fiber temperature logging curve.
4. The method of claim 1, wherein analyzing the temperature gradient profile to determine a fluid production location comprises: and taking a depth point which is larger than a preset temperature gradient threshold value in the temperature gradient curve as a fluid extraction position.
5. The method of claim 4, wherein the taking as the fluid extraction location a depth point in the temperature gradient profile that is greater than a preset temperature gradient threshold value comprises: Searching from bottom to top in the temperature gradient curve, and taking a depth point which is larger than a preset temperature gradient threshold value in the temperature gradient curve as a fluid extraction position.
6. The method of claim 1, wherein correcting the distributed fiber optic temperature log for depth of log based on the fluid production location, obtaining corrected depth of log, comprises: And correcting the logging depth of the distributed optical fiber temperature logging curve according to the fluid extraction position and the distance between the wellhead acquisition device and the ground, so as to obtain corrected logging depth.
7. The method of claim 6, wherein correcting the distributed fiber optic temperature log for depth of log based on the fluid production location and the distance between the wellhead acquisition device and the surface, the obtaining corrected depth of log comprises: According to the formula d c ＝l-(l 0 +h), correcting the logging depth of the distributed optical fiber temperature logging curve to obtain corrected logging depth; wherein d c is the corrected logging depth, l is the optical fiber length, l 0 is the fluid extraction position, and h is the distance between the wellhead acquisition device and the ground.
8. A distributed optical fiber temperature logging depth correction device, comprising: The optical fiber length range determining module is used for analyzing the form of the distributed optical fiber temperature logging curve and determining the optical fiber length range corresponding to the fluid extraction position; The temperature gradient curve calculation module is used for calculating a temperature gradient curve in the optical fiber length range corresponding to the fluid extraction position according to the distributed optical fiber temperature logging curve; The fluid extraction position determining module is used for analyzing the temperature gradient curve and determining the fluid extraction position; and the logging depth correction module is used for carrying out logging depth correction on the distributed optical fiber temperature logging curve according to the fluid extraction position to obtain corrected logging depth.
9. An electronic device, comprising: A processor; a memory; and a computer program, wherein the computer program is stored in the memory, which computer program, when executed by the processor, implements the method of any of claims 1-7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the method of any of claims 1-7.
11. A computer program product, characterized in that the computer program product comprises a computer program which, when executed by a processor, implements the method of any of claims 1-7.

Description

Optical fiber temperature logging depth correction method, device, equipment, medium and product Technical Field The application relates to the technical field of oil and gas exploration and development, in particular to a method, a device, equipment, a medium and a product for correcting the optical fiber temperature logging depth. Background And the distributed optical fiber temperature monitoring is used for collecting Anti-Stokes and Stokes light, and the temperature signal is demodulated by using the ratio of the intensities of the Anti-Stokes and the Stokes light. The distributed optical fiber has the advantages of high measurement precision, low probability of electromagnetic interference, non-contact measurement, simple installation, easiness in underground long-term or permanent monitoring and the like, and is widely applied to horizontal well fracturing, liquid production profile interpretation and the like in oil and gas well production. And when the distributed optical fiber temperature is used for logging, the optical fiber is taken down along with the steel cable, and the temperature signal of the whole optical fiber is continuously measured and recorded, so that a distributed optical fiber temperature logging curve is obtained. In a distributed fiber temperature log, the length of the fiber is used to characterize the logging depth. However, characterizing the well depth using fiber length is not accurate, and therefore, depth correction of fiber length is also required to be converted into data interpretable well depths. It should be noted that the information disclosed in the background section of the present application is only for enhancement of understanding of the general background of the present application and should not be taken as an admission or any form of suggestion that this information forms the prior art that is well known to a person skilled in the art. Disclosure of Invention In view of the above, the present application provides a method, apparatus, device, medium and product for correcting the logging depth of optical fiber temperature, so as to solve the problem of inaccurate logging depth in the distributed optical fiber temperature logging curve in the prior art. In a first aspect, an embodiment of the present application provides a distributed optical fiber temperature logging depth correction method, including: analyzing the morphology of the distributed optical fiber temperature logging curve, and determining the length range of the optical fiber corresponding to the fluid extraction position; Calculating a temperature gradient curve in the optical fiber length range corresponding to the fluid extraction position according to the distributed optical fiber temperature logging curve; analyzing the temperature gradient curve to determine a fluid extraction position; And correcting the logging depth of the distributed optical fiber temperature logging curve according to the fluid extraction position to obtain corrected logging depth. In one possible implementation, the analyzing the morphology of the distributed optical fiber temperature log to determine the optical fiber length range corresponding to the fluid extraction position includes: And determining the length range of the optical fiber corresponding to the fluid extraction position according to the morphological change of the distributed optical fiber temperature logging curve and the reference surface temperature value. In one possible implementation manner, the calculating a temperature gradient curve in the optical fiber length range corresponding to the fluid extraction position according to the distributed optical fiber temperature logging curve includes: Calculating a temperature gradient curve in the optical fiber length range corresponding to the fluid extraction position according to the formula T grad,i＝(Ti-1-Ti+1)/(2 delta d); Wherein, T grad,i is the temperature gradient value of the ith depth point, T i-1 and T i+1 are the temperature values corresponding to the (i-1) th and (i+1) th depth points in the distributed optical fiber temperature logging curve, and Δd is the sampling interval of the distributed optical fiber temperature logging curve. In one possible implementation, the analyzing the temperature gradient curve to determine a fluid production location includes: and taking a depth point which is larger than a preset temperature gradient threshold value in the temperature gradient curve as a fluid extraction position. In one possible implementation manner, the step of taking a depth point, which is greater than a preset temperature gradient threshold, in the temperature gradient curve as a fluid extraction position includes: Searching from bottom to top in the temperature gradient curve, and taking a depth point which is larger than a preset temperature gradient threshold value in the temperature gradient curve as a fluid extraction position. In one possible implementation manner, the correc