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Geostress measurement method and system

A measurement system and in-situ stress technology, applied in the field of oil and gas field exploration and development, can solve the problems of time-consuming and labor-intensive pasting of strain gauges, cumbersome data processing, etc., and achieve the effects of simple operation, improved measurement efficiency, and improved measurement accuracy

Active Publication Date: 2015-08-26
PETROCHINA CO LTD
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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

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  • Geostress measurement method and system
  • Geostress measurement method and system
  • Geostress measurement method and system

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Embodiment Construction

[0052] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0053] See figure 2 . An in-situ stress measurement method provided by an embodiment of the present application includes the following steps: preparing a core sample to be measured, the core sample having at least three intersecting planes; and applying an enclosure to the core sample The strain value of the core sample is collected, and the collected strain value includes the normal strain on the three planes and the strain along the a...

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Abstract

The invention discloses a geostress measurement method. Positive strain on three planes and strain in direction of the angular bisector of every two intersected planes are acquired so that stress components describing the rock core sample strain state are confirmed according to the shear strain reciprocal theorem. The invention also provides a geostress measurement system. Positive strain on the planes is obtained by measurement through a displacement sensor contacted with the plane of a rock core sample, strain on the two intersected planes sharing the edges is obtained by measurement through a displacement sensor contacted with the edges of the rock core sample, and shear strain on the intersected planes is obtained by decomposing the strain so that six strain components describing the strain state of the rock core sample are conveniently obtained. Besides, angular deviation probably caused by pasting strain sheets and bubbles between the strain sheets and the rock core sample can be avoided so that measurement precision is greatly enhanced.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas field exploration and development, and in particular relates to a method and system for measuring in-situ stress for evaluating the stress state of a rock core. Background technique [0002] In-situ stress is one of the important factors that control the distribution of oil and gas enrichment areas, hydraulic fracture propagation, reservoir fracture distribution, and oil well casing damage. It is an indispensable basic data for the formulation of oil and gas field development plans and oil well engineering design. Therefore, in-situ stress research is of great significance in oil and gas exploration and development. [0003] The most direct and reliable method to evaluate the stress state of a rock core is ground stress measurement. The differential strain analysis method is a common indoor core measurement method. This method has achieved good results in many applications of in-situ stress measurem...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00G01N19/00
Inventor 沈露禾刘建东
Owner PETROCHINA CO LTD