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The present generally relates to apparatus and methods for instrumentation associated with a downhole deployment valve or a separate instrumentation sub. In one aspect, a DDV in a casing string is closed in order to isolate an upper section of a wellbore from a lower section. Thereafter, a pressure

The present generally relates to apparatus and methods for instrumentation associated with a downhole deployment valve or a separate instrumentation sub. In one aspect, a DDV in a casing string is closed in order to isolate an upper section of a wellbore from a lower section. Thereafter, a pressure differential above and below the closed valve is measured by downhole instrumentation to facilitate the opening of the valve. In another aspect, the instrumentation in the DDV includes sensors placed above and below a flapper portion of the valve. The pressure differential is communicated to the surface of the well for use in determining what amount of pressurization is needed in the upper portion to safely and effectively open the valve. Additionally, instrumentation associated with the DDV can include pressure, temperature, seismic, acoustic, and proximity sensors to facilitate the use of not only the DDV but also telemetry tools.

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The invention claimed is: 1. A method of using a downhole deployment valve (DDV) in a wellbore extending to a first depth, the method comprising: assembling the DDV as part of a tubular string, the DDV comprising: a valve member movable between an open and a closed position; an axial bore therethro

The invention claimed is: 1. A method of using a downhole deployment valve (DDV) in a wellbore extending to a first depth, the method comprising: assembling the DDV as part of a tubular string, the DDV comprising: a valve member movable between an open and a closed position; an axial bore therethrough in communication with an axial bore of the tubular string when the valve member is in the open position, the valve member substantially sealing a first portion of the tubular string bore from a second portion of the tubular string bore when the valve member is in the closed position; and a sensor configured to sense a parameter of the wellbore or a parameter of a formation; running the tubular string into the wellbore; running a drill string through the tubular string bore and the DDV bore, the drill string comprising a drill bit located at an axial end thereof; drilling the wellbore to a second depth using the drill string and the drill bit; sensing the wellbore or formation parameter with the sensor while drilling the wellbore to the second depth; and adjusting a trajectory of the drill string while drilling the wellbore to the second depth. 2. The method of claim 1, further comprising adjusting a composition or amount of drilling fluid while drilling the wellbore to the second depth. 3. The method of claim 1, wherein sensing the wellbore or formation parameter with the sensor comprises receiving at least one acoustic wave transmitted into a formation from a seismic source. 4. The method of claim 3, wherein the seismic source transmits the at least one acoustic wave from the drill string to the sensor. 5. The method of claim 3, wherein the seismic source transmits the at least one acoustic wave from a surface of the wellbore to the sensor. 6. The method of claim 3, wherein the seismic source transmits the at least one acoustic wave from an adjacent wellbore to the sensor. 7. The method of claim 3, wherein the seismic source transmits the at least one acoustic wave from the drill string vibrating against the wellbore to the sensor. 8. The method of claim 1, wherein the wellbore or formation parameter is a microseismic measurement. 9. A method of using a downhole deployment valve (DDV) in a wellbore extending to a first depth, the method comprising: assembling the DDV as part of a tubular string, the DDV comprising: a valve member movable between an open and a closed position; an axial bore therethrough in communication with an axial bore of the tubular string when the valve member is in the open position, the valve member substantially sealing a first portion of the tubular string bore from a second portion of the tubular string bore when the valve member is in the closed position; and a sensor configured to sense a parameter of the DDV, a parameter of the wellbore, or a parameter of a formation; assembling a flow meter as part of the tubular string; running the tubular string into the wellbore; running a drill string through the tubular string bore and the DDV bore, the drill string comprising a drill bit located at an axial end thereof; drilling the wellbore to a second depth using the drill string and the drill bit; injecting drilling fluid through the drill string while drilling the wellbore to the second depth, wherein the drilling fluid returns from the drill bit through the tubular string; measuring characteristics of the return fluid using the flow meter; and determining at least one of a volumetric phase fraction for the return fluid and flow rate of the return fluid based on the measured fluid characteristics. 10. The method of claim 9, further comprising adjusting the injection rate of the drilling fluid. 11. The method of claim 9, further comprising using the at least one of the volumetric phase fraction and the flow rate to determine formation properties while drilling the wellbore to the second depth. 12. A method of using a downhole deployment valve (DDV) in a wellbore extending to a first depth, the method comprising: assembling the DDV as part of a tubular string, the DDV comprising: a valve member movable between an open and a closed position; an axial bore therethrough in communication with an axial bore of the tubular string when the valve member is in the open position, the valve member substantially sealing a first portion of the tubular string bore from a second portion of the tubular string bore when the valve member is in the closed position; and a sensor configured to sense a parameter of the wellbore or a parameter of a formation; running the tubular string into the wellbore; running a drill string through the tubular string bore and the DDV bore, the drill string comprising a drill bit located at an axial end thereof; drilling the wellbore to a second depth using the drill string and the drill bit; and receiving at least one acoustic wave with the sensor transmitted into a formation from a seismic source while drilling the wellbore to the second depth. 13. The method of claim 12, wherein the seismic source transmits the at least one acoustic wave from the drill string to the sensor. 14. The method of claim 12, wherein the seismic source transmits the at least one acoustic wave from a surface of the wellbore to the sensor. 15. The method of claim 12, wherein the seismic source transmits the at least one acoustic wave from an adjacent wellbore to the sensor. 16. The method of claim 12, wherein the seismic source transmits the at least one acoustic wave from the drill string vibrating against the wellbore to the sensor. 17. A method of using a downhole deployment valve (DDV) in a wellbore extending to a first depth, the method comprising: assembling the DDV as part of a tubular string, the DDV comprising: a valve member movable between an open and a closed position; an axial bore therethrough in communication with an axial bore of the tubular string when the valve member is in the open position, the valve member substantially sealing a first portion of the tubular string bore from a second portion of the tubular string bore when the valve member is in the closed position; and a microseismic sensor; running the tubular string into the wellbore; running a drill string through the tubular string bore and the DDV bore, the drill string comprising a drill bit located at an axial end thereof; drilling the wellbore to a second depth using the drill string and the drill bit; and making a microseismic measurement with the sensor while drilling the wellbore to the second depth. 18. A method of drilling a wellbore, comprising: running a drill string into the wellbore, through a bore of a tubular string, and along or through an open valve member, the tubular string comprising: the valve member moveable between the open position and a closed position, wherein: the valve member substantially seals a first portion of the tubular string bore from a second portion of the tubular string bore in the closed position, and the valve member is a flapper or ball, a first pressure sensor, and a control line operable to provide communication between the sensor and a surface of the wellbore; drilling the wellbore using the drill string; and measuring a pressure of the wellbore while drilling using the first pressure sensor. 19. A method of drilling a wellbore, comprising: running a drill string into the wellbore, through a bore of a tubular string, and along or through an open valve member, the tubular string comprising: the valve member moveable between the open position and a closed position, wherein: the valve member substantially seals a first portion of the tubular string bore from a second portion of the tubular string bore in the closed position, and the valve member is a flapper or ball, a first pressure sensor in fluid communication with the first portion of the bore, a second pressure sensor in fluid communication with the second portion of the bore, and a control line operable to provide communication between the sensors and a surface of the wellbore; and drilling the wellbore using the drill string. 20. The method of claim 18, wherein the valve member is located at a depth in the wellbore of at least 90 feet from the surface. 21. The method of claim 18, wherein: the tubular string extends from a wellhead located at the surface, the wellhead comprises a rotating drilling head (RDH) or a stripper and a valve assembly; and the method further comprises engaging the drill string with the RDH or stripper. 22. The method of claim 21, wherein the wellbore is drilled in an underbalanced or near underbalanced condition. 23. The method of claim 21, further comprising using the valve assembly to control flow of fluid from the wellbore while drilling the wellbore. 24. The method of claim 18, further comprising cementing the tubular string to the wellbore. 25. The method of claim 18, further comprising: retracting the drill string to the first portion of the bore; closing the valve member; depressurizing the first portion of the bore; and removing the drill string from the wellbore. 26. A method of drilling a wellbore, comprising: running a drill string into the wellbore, through a bore of a tubular string, and along or through an open valve member, the tubular string comprising: the valve member moveable between the open position and a closed position, wherein: the valve member substantially seals a first portion of the tubular string bore from a second portion of the tubular string bore in the closed position, and the valve member is a flapper or ball, a sensor operable to sense a parameter of the valve member or a parameter of the wellbore, and a control line operable to provide communication between the sensor and the surface, wherein: the tubular string extends from a wellhead located at a surface of the wellbore, and the wellhead comprises a rotating drilling head (RDH) or a stripper and a valve assembly; engaging the drill string with the RDH or stripper; and drilling the wellbore using the drill string.