▎ 摘　　要

NOVELTY - The strain sensing system (301a,301b), has a strain sensor (320a-320d,324a-324b) positionable between the outer surface of a wellbore casing and a subterranean formation (317) for sensing strain tensor elements. The strain tensor elements have multiple components of strain tensor. A computing device (326a,326b) is positionable at the surface of a wellbore and communicatively coupled to the strain sensor. A communication link (328a,328b) is arranged between the strain sensor and the computing device for communicatively coupling the strain sensor to computing device to relay strain data containing strain tensor elements. The strain sensor has at least one of a resistive strain gauge acting on faces of a polyhedron, a three-dimensional piezoresistive sensor, a graphene transistor strain sensor, a Fiber Bragg grating strain sensor, or a gravitational direction sensing element. USE - Vector strain sensing system for monitoring fracture-induced strain near downhole wellbore. Uses include but are not limited to sub-sea well system, non-fractured well, steam assisted gravity drain, underground gas storage, geothermal production, underground water storage, mining, carbon dioxide sequestration. ADVANTAGE - The non-explosive process allows for more control of the shape, quality, and penetration distance of the perforation. The plug protects the strain sensors and helps with preventing damage to the strain sensors during treatment or hydraulic fracturing of the well system. Measuring multiple components of strain provides data which provides more comprehensive information relating to deformation of the wellbore or the subterranean formation due to production-induced geomechanical stresses, hydraulic fracturing, or other sub-surface processes. Receiving the sensor data allows for an improved understanding of the strain changes in a target reservoir in the subterranean formation and enables hydraulic fracturing control system to optimize the stage sequencing during the hydraulic fracturing process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for sensing vector strain downhole in a wellbore. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the two well systems for monitoring fracture-induced strain near a wellbore using a strain sensing system. Strain sensing system (301a, 301b) Subterranean formation (317) Strain sensor (320a, 320b, 320c, 320d, 324a, 324b) Computing device (326a, 326b) Communication link (328a, 328b)