Mapping of fracture geometries in a multi-well stimulation process

A system for assessing one or more geometric parameters of fractures in a subsurface formation, comprising:

• a first wellbore in the subsurface formation;
• a first fracture emanating from a selected interval in the first wellbore, the first fracture being in direct fluid communication with a first fluid in the first wellbore;
• a second wellbore in the subsurface formation;
• a second fracture configured to be formed from a first interval in the second wellbore and in direct fluid communication with a second fluid in the second wellbore;
• a third fracture configured to be formed from a second interval in the second wellbore and in direct fluid communication with a third fluid in the second wellbore, the second interval in the second wellbore being spatially separated from the first interval in the second wellbore;
• a pressure sensor in direct fluid communication with the first fluid in the first wellbore;
• and
• a computer processor configured to receive one or more pressure signals from the pressure sensor, wherein the computer processor is configured to assess a first pressure signal from the pressure sensor while the second fracture is being formed and assess a second pressure signal from the pressure sensor while the third fracture is being formed, the first pressure signal being induced by formation of the second fracture and the second pressure signal being induced by formation of the third fracture, and wherein the computer processor is configured to:
• assess a first spatial location of a part of the first interval in the second wellbore relative to the selected interval in the first wellbore;
• assess a second spatial location of a part of the second interval in the second wellbore relative to the selected interval in the first wellbore;
• and
• assess one or more geometric parameters of the second fracture and the third fracture using the first pressure signal and the second pressure signal in combination with the first assessed spatial location and the second assessed spatial location.

A non-transient computer-readable medium including instructions that, when executed by one or more processors, causes the one or more processors to perform a method, comprising:

• assessing a first pressure signal in a first wellbore using a pressure sensor in direct fluid communication with a first fluid in the first wellbore, wherein the first fluid in the first wellbore is in direct fluid communication with a first fracture in the subsurface formation emanating from a selected interval in the first wellbore, and wherein the first pressure signal assessed in the first wellbore includes a pressure change induced by formation of a second fracture emanating from a first interval in a second wellbore in the subsurface formation, the second fracture being in direct fluid communication with a second fluid in the second wellbore in the subsurface formation;
• assessing a second pressure signal in the first wellbore using the pressure sensor in direct fluid communication with the first fluid in the first wellbore, wherein the second pressure signal assessed in the first wellbore includes a pressure change induced by formation of a third fracture emanating from a second interval in the second wellbore in the subsurface formation, the second interval in the second wellbore being spatially separated from the first interval in the second wellbore, wherein the third fracture is in direct fluid communication with a third fluid in the second wellbore in the subsurface formation;
• assessing a first spatial location of a part of the first interval in the second wellbore relative to the selected interval in the first wellbore;
• assessing a second spatial location of a part of the second interval in the second wellbore relative to the selected interval in the first wellbore;
• and
• assessing one or more geometric parameters of the second fracture and the third fracture using the first pressure signal and the second pressure signal in combination with the first assessed spatial location and the second assessed spatial location.

A method for of treating a subsurface formation, comprising:

• assessing a first pressure signal in a first wellbore using a pressure sensor in direct fluid communication with a first fluid in the first wellbore, wherein the first fluid in the first wellbore is in direct fluid communication with a first fracture in the subsurface formation emanating from a selected interval in the first wellbore, and wherein the first pressure signal assessed in the first wellbore includes a pressure change induced by formation of a second fracture emanating from a first interval in a second wellbore in the subsurface formation, the second fracture being in direct fluid communication with a second fluid in the second wellbore in the subsurface formation;
• assessing a second pressure signal in the first wellbore using the pressure sensor in direct fluid communication with the first fluid in the first wellbore, wherein the second pressure signal assessed in the first wellbore includes a pressure change induced by formation of a third fracture emanating from a second interval in the second wellbore in the subsurface formation, the second interval in the second wellbore being spatially separated from the first interval in the second wellbore, wherein the third fracture is in direct fluid communication with a third fluid in the second wellbore in the subsurface formation;
• determining, using a simulation on a computer processor, a first simulated fracture geometry for the second fracture emanating from the second wellbore, wherein the first simulated fracture geometry is determined as a simulated fracture geometry selected from a plurality of simulated fracture geometries that provides a minimum in a total error between at least two simulated pressure signals and the assessed pressure signals, the total error being a sum of a first error between a first simulated pressure signal and the first assessed pressure signal and a second error between a second simulated pressure signal and the second assessed pressure signal;
• wherein the first simulated pressure signal and the second simulated pressure signal are determined for the first simulated fracture geometry based on a spatial relationship between the second fracture and the first fracture, a spatial relationship between the first interval and the second interval in the second wellbore, and a net pressure applied in the second wellbore.

A system for assessing one or more geometric parameters of fractures in a subsurface formation, comprising:

• a first wellbore in the subsurface formation;
• at least a first fracture emanating from a selected interval in the first wellbore, the first fracture being in direct fluid communication with a first fluid in the first wellbore;
• a second wellbore in the subsurface formation;
• a second fracture configured to be formed from a first interval in the second wellbore and in direct fluid communication with a second fluid in the second wellbore;
• a third fracture configured to be formed from a second interval in the second wellbore and in direct fluid communication with a third fluid in the second wellbore, the second interval in the second wellbore being spatially separated from the first interval in the second wellbore;
• a pressure sensor in direct fluid communication with the first fluid in the first wellbore;
• and
• a computer processor configured to receive one or more pressure signals from the pressure sensor, wherein the computer processor is configured to assess a first pressure signal from the pressure sensor while the second fracture is being formed and assess a second pressure signal from the pressure sensor while the third fracture is being formed, the first pressure signal being induced by formation of the second fracture and the second pressure signal being induced by formation of the third fracture, and wherein the computer processor is configured to:
• determine, using a simulation on the computer processor, a first simulated fracture geometry for the second fracture emanating from the second wellbore, wherein the first simulated fracture geometry is determined as a simulated fracture geometry selected from a plurality of simulated fracture geometries that provides a minimum in a total error between at least two simulated pressure signals and the assessed pressure signals, the total error being a sum of a first error between a first simulated assessed pressure signal and the first pressure signal and a second error between a second simulated pressure signal and the second assessed pressure signal;
• wherein the first simulated pressure signal and the second simulated pressure signal are determined for the first simulated fracture geometry based on a spatial relationship between the second fracture and the first fracture, a spatial relationship between the first interval and the second interval in the second wellbore, and a net pressure applied in the second wellbore.