Method for detecting and evaluating damage of oil casing pipes in oil-gas field

Abstract

The invention discloses a method for detecting and evaluating damage of oil casing pipes in an oil-gas field, which comprises the following steps of: performing contrastive analysis on technical parameters of different logging instruments and actual logging information, and selecting the logging instrument which meets the requirements according to the actual production needs of an oilfield and logging conditions which can be provided; manufacturing an oil pipe model, performing different single-layer and double-layer pipe column combination on the oil pipe model as well as the oil casing pipes without the damage, detecting the logging response characteristic by the selected logging instrument, and manufacturing a logging response characteristic board for the damage of the oil casing pipes; performing secondary electromotive force attenuation curve analysis on detection data of the model and actual logging data, and partitioning according to a secondary electro-dynamic potential attenuation curve; and analyzing the damage of the oil casing pipes, and determining the drawing mode of a logging curve diagram according to the partitioning result so as to intuitively reflect the damage of the oil casing pipes at the inner layer and the outer layer. By adopting the method, ambiguity can be reduced and precision of logging interpretation and timeliness of the diagram can be improved.

Description

technical field [0001] The invention relates to a damage detection method for oil and gas field equipment, in particular to a damage detection and evaluation method for an oil and gas field oil casing. Background technique [0002] At present, oil and gas field casing damage detection and evaluation technologies are often based on a certain logging method. For example, the application of the MIT and MID-K combined oil casing damage detection technology disclosed in the "Foreign Logging Technology" in the 01 issue of 2008 in the Sichuan gas field. As another example, MID-K and MIT were used to detect oil and casing damage in the Sangao gas field in the 04th issue of "Logging Technology" in 2008, and the technical indicators of the MIT and MID-K instruments were disclosed; Logging data, using MID-K logging data to identify the joint collar of the outer casing; using MIT multi-arm caliper logging data to identify the corrosion and scaling of the inner wall of the tubing; u...

AI Technical Summary

Problems solved by technology

[0003] Even if there is combined logging in the existing technology, there is no systematic research on the complex downhole logging environment, and there is still a lack of pertinence in the optimization selection and interpretation evaluation of logging series

As a result, explanations are more multi-solution, explanation evaluation accuracy and interpretation coincidence rate are low

[0004] As mentioned above, the existing oil and gas field casing damage detection and evaluation technology mainly has the following shortcomings: 1. The MID-K original logging data processing software written in Russia has poor adaptability and can only analyze the longitudinal probe at a certain depth point. The attenuation curve of the secondary electromotive force is not conducive to the analysis and comparison of data, and it is easy to cause ambiguity; 2. The MIT and MID-K tubing damage logging response characteristics for various holes, holes, fractures, etc. lack a system 1. Clear research results are not conducive to the improvement of interpretation coincidence rate and interpretation evaluation accuracy; 3. Lack of systematic, Clear research results are not conducive to the development of interpretation and evaluation work