Characterizing oil, gasor geothermal wells, including fractures thereof

A method of determining a characteristic of an oil, gas or geothermal well, comprising:

• detecting a higher frequency signal superposed on a lower frequency signal obtained from an oil, gas or geothermal well in response to an excitation event by digitally separating an electrical representation of the higher frequency signal from an electrical representation of the lower frequency signal using wavelet processing, wherein the higher frequency signal includes a pressure signal responsive to a fracture extending from a wellbore of the well;
• and
• using the higher frequency signal to determine a characteristic of the well.

A method of determining a characteristic of an oil, gas or geothermal well, comprising:

• detecting a higher frequency signal superposed on a lower frequency signal obtained from an oil, gas or geothermal well in response to an excitation event by digitally separating an electrical representation of the higher frequency signal from an electrical representation of the lower frequency signal using wavelet processing;
• and
• using the higher frequency signal to determine a characteristic of the well.

A method of determining a characteristic of an oil, gas or geothermal well, comprising:

• detecting a higher frequency signal superposed on a lower frequency signal obtained from an oil, gas or geothermal well in response to an excitation event wherein the higher frequency signal is a pressure signal and wherein the excitation event includes pumping a proppant-carrying fluid into the well and proppant therein reaching a tip of a fracture in the well;
• and
• using the higher frequency signal to determine a characteristic of the well.

A method of determining a characteristic of an oil, gas or geothermal well, comprising:

• detecting a higher frequency signal superposed on a lower frequency signal obtained from an oil, gas or geothermal well in response to an excitation event wherein the excitation event includes pumping a proppant-carrying fluid into the well and proppant therein reaching a tip of a fracture in the well;
• and
• using the higher frequency signal to determine a characteristic of the well.

A method of determining a characteristic of an oil, gas or geothermal well, comprising:

• detecting a higher frequency signal superposed on a lower frequency signal obtained from an oil, gas or geothermal well in response to an excitation event wherein the excitation event includes at least partially closing a fracture extending from a wellbore of the well;
• and
• using the higher frequency signal to determine a characteristic of the well.