Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Wellhead excitation type detection method for defects of outer coating of casing of shallow well in oil field

A detection method and outer coating technology, applied in wellbore/well components, measurement, earthwork drilling, etc., can solve the problem of not reflecting the quality of the coating, and achieve the effect of reliable principle and simple and convenient operation.

Pending Publication Date: 2021-09-21
PETROCHINA CO LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the existing problem that the quality of the coating cannot be reflected, the invention provides a wellhead excitation detection method for the outer coating defect of the shallow well casing in the oil field. Potential change difference, to achieve the purpose of reflecting the quality of the coating

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wellhead excitation type detection method for defects of outer coating of casing of shallow well in oil field
  • Wellhead excitation type detection method for defects of outer coating of casing of shallow well in oil field
  • Wellhead excitation type detection method for defects of outer coating of casing of shallow well in oil field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In order to overcome the existing problems that cannot reflect the quality of the coating, the present invention provides such as Figure 1-3 Shown is a wellhead excitation detection method for casing outer coating defects in shallow wells in the oil field. The invention uses measuring electrodes to measure the difference in potential change caused by the quality difference of coating defects to achieve the purpose of reflecting the quality of the coating. .

[0030] A wellhead excitation type detection method for casing outer coating defects in shallow wells in an oil field, comprising the following steps:

[0031] Step 1: In the wells with intact outer coating, detect the outer coating of the casing, collect the well depth, measure the electrode potential data, and draw the well depth-intact coating potential curve obtained with the casing coating intact. This potential data is regarded as the casing outer coating intact standard data in the case of

[0032] Step 2:...

Embodiment 2

[0037] Based on the basis of Example 1, in this embodiment, preferably, in the step 1, the detection method of the outer coating is: after the well with the outer coating is intact, the well is cleaned, and the electrolyte is injected, the The ground loop electrode is buried on the side of the ground away from the wellhead, and the positive pole of the power supply is connected to the wellhead casing, and then the instrument string is lowered, and the instrument is adjusted to a normal state while going down to the bottom of the well; the detection program is started during the lifting of the instrument string, and the normal The electrodes provide constant voltage signals, and the instrument string collects well depth and measures electrode potential data.

[0038] Preferably, the instrument string includes a bridle 9 connected sequentially from top to bottom, a detection electrode 6, a magnetic locator 5, a weighting rod 2 and a centralizer 1; the bridle 9 is connected to the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a wellhead excitation type detection method for defects of an outer coating of a casing of a shallow well in an oil field. The wellhead excitation type detection method for the defects of the outer coating of the casing of the shallow well in the oil field comprises the following steps of S1, detecting the outer coating of the casing of a well with an intact outer coating, and collecting well depth and measuring electrode potential data; S2, detecting potential information of a well without an outer coating of the casing, and collecting well depth and measuring electrode potential data; S3, detecting an outer coating of a casing of a well to be measured, and collecting well depth and measuring electrode potential data; and S4, correspondingly obtaining the potential change relative value of two measuring points with the distance of 0.05-1 m according to the standard data of the well with the complete outer coating and the well without the coating outside the casing and the actually measured data of the well to be measured,, and drawing a well depth-change relative value curve of three states under the same coordinate, wherein the curve visually displays and measures the quality condition of the coating outside the well. According to the wellhead excitation type detection method for the defects of the outer coating of the casing of the shallow well in the oil field, a measuring electrode is used for measuring the potential change difference generated by the influence of the coating defect quality difference, so that the purpose of reflecting the quality of the coating is achieved.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coating detection, and in particular relates to a wellhead excitation type detection method for outer coating defects of shallow well casings in oil fields. Background technique [0002] Oilfields at home and abroad generally adopt the "organic outer coating + cathodic protection" technology to prolong the service life of pipelines and oil casings. Among them, the raw materials of the organic outer coating of the casing are mainly organic coatings such as epoxy coal tar pitch cold wrap tape, epoxy resin or epoxy phenolic formaldehyde, which are cured at room temperature and high temperature to form a protective coating on the outer wall. Before the oil well casing is put into the well and completed, the quality of the outer coating can be determined on the ground by means of visual inspection, leakage points, and insulation detectors. Mature and effective methods include magnetic thickness ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E21B47/00E21B47/04
CPCE21B47/00E21B47/04Y02A90/30
Inventor 程碧海李琼玮薛建强张振云李慧郭钢付彩利李兵钱雄涛
Owner PETROCHINA CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com