Ground stress multifrequency reverse demonstration method of dipole trans verse wave well logging

An in-situ stress, array acoustic logging technology, which is applied in seismology, earth-moving drilling, wellbore/well components, etc. for logging records, and can solve problems such as difficulty in obtaining stress magnitude and difficulty in measurement.

Inactive Publication Date: 2005-03-30
DAQING OILFIELD CO LTD
View PDF0 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is based on fracturing, and the stress measurement around the wellbore is also carried out under the condition of destroying the wellbore. Because the tensile strength T of the rock is difficult to measure, it is difficult to obtain an accurate stress value.
It can be s...

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
  • Ground stress multifrequency reverse demonstration method of dipole trans verse wave well logging
  • Ground stress multifrequency reverse demonstration method of dipole trans verse wave well logging
  • Ground stress multifrequency reverse demonstration method of dipole trans verse wave well logging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The present invention is carried out under following enlightenment: Rai, C.S., and Hanson, K.E. et al. found in 1988 by the measurement of shear wave velocity anisotropy in sedimentary rock, the acoustic elastic phenomenon of rock is very obvious, and the sound wave velocity in rock is affected by The influence of the applied stress is great, the velocity of the longitudinal and shear waves increases with the increase of the applied stress, and under the action of the applied stress, the dipole shear wave will split into fast and slow dipole shear waves parallel and perpendicular to the applied stress. Based on this, the inventor considers using the cross-dipole shear wave logging data to invert the magnitude of the in-situ stress based on the acoustic theory. Of course, how to perform the correct inversion is a problem that needs to be considered.

[0012] To this end, the inventors first established the state under the action of uniform hydrostatic pressure, that is, t...

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 is used in the field of oil field logging technology, mainly resolving the defect of existent earth stress detection technology which has not any one non-destructive examination method. Said invention is characterized by that it includes the following steps: making cross dipole array acoustic log data undergo the process of angle rotation treatment, then obtaining two main time sequences, on said basis extracting flexural wave dispersion curves of two principal directions, utilizing data of n frequency points on the flexural wave dispersion curves of two principal polarization directions to create n equalities according to two formulae, in which said formulae can be obtained by inversion of well mode wave acoustic elastic equation, in which n is greater than or equal to 6, and atilizing resolution of sain n equalities so as to can obtain maximum main stress SH and minimum main stress Sh of formation.

Description

Technical field: [0001] The invention relates to a method for detecting geostress in oil-water wells in the field of oil field logging, in particular to a method for detecting geostress using dipole acoustic logging data. Background technique: [0002] Casing damage in oil and water wells is a major petroleum engineering problem that commonly exists in various oil fields at home and abroad. The casing is damaged and loses production capacity due to abnormal external force, which not only directly affects the production of the well, but also causes huge economic losses, and the casing damaged well will also cause imperfect regional injection-production systems, accelerate production decline, etc., and indirect losses are even greater. The investment in overhaul of casing damaged wells is also large, so predicting and preventing casing damage has become a common concern in the fields of petroleum engineering and well logging. The research results in recent years have given a ...

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): E21B49/00G01V1/40G01V1/48
Inventor 谢荣华刘继生吕秀梅曾桂红冯逾
Owner DAQING OILFIELD CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap