A method and system for measuring ground stress
A technology of in-situ stress and shear strain, which is applied in the field of oil and gas field exploration and development, can solve the problems of cumbersome data processing, time-consuming and labor-intensive pasting of strain gauges, etc., and achieve the effects of improving measurement efficiency, easy operation, and improving measurement accuracy
Active Publication Date: 2017-11-10
PETROCHINA CO LTD
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0011] Aiming at the shortcomings of pasting strain gauges to measure the in-situ stress state of rock cores in the prior art due to time-consuming and labor-intensive pasting of strain gauges and cumbersome post-processing data, the present invention provides a method and system for measuring in-situ stress
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0052] 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 creative efforts fall within the protection scope of the present invention.
[0053] See figure 2 . An in-situ stress measurement method provided in an embodiment of the present application comprises the steps of: preparing a rock core sample to be measured, the rock core sample having at least three mutually intersecting planes; The strain value of the core sample is collected, and the collected strain value includes the normal strain on three planes, and the strain along the angle bisector of any two intersecting planes; according 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
Login to View More Abstract
The invention discloses a method for measuring ground stress. By collecting normal strains on three planes and strains along the bisector direction of two intersecting planes, according to the shear-strain reciprocal theorem, the rock core sample is determined and described. The stress component of the strain state. The present invention also provides a system for measuring ground stress. The normal strain on the plane is measured by a displacement sensor in contact with the plane of the core sample, and the displacement sensor in contact with the edge of the core sample is measured to obtain the total The strain on the two intersecting planes of the edge, decompose the strain to obtain the shear strain on the intersecting plane, so as to conveniently obtain six strain components describing the strain state of the core sample; and avoid the angle deviation that may be caused by pasting the strain gauge And the air bubbles between the strain gauge and the core sample, thus greatly improving the measurement accuracy.
Description
technical field [0001] The invention belongs to the technical field of exploration and development of oil and gas fields, and in particular relates to a method and system for measuring ground stress for evaluating the stress state of rock cores. Background technique [0002] In-situ stress is one of the important factors controlling the distribution of oil and gas enrichment areas, the expansion of hydraulic fracturing fractures, the distribution of reservoir fractures, and the failure of oil well casings. It is an indispensable basic data for the formulation of oil and gas field development plans and oil well engineering design. Therefore, the study of in-situ stress is of great significance in oil and gas exploration and development. [0003] The most direct and reliable method to evaluate the stress state of rock core is in-situ stress measurement. The differential strain analysis method is a common indoor core measurement method, which has achieved good results in many ...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00G01N19/00
Inventor 沈露禾刘建东
Owner PETROCHINA CO LTD