Operations involves preparing and deploying specialized seismic tools in a well to collect high-resolution seismic data. This process is critical in geophysical exploration and reservoir characterization. Here’s a step-by-step discussion of the logging tool rig-up for a VSP run:

Pre-Job Planning and Safety Checks
Job planning: Coordinate with geophysicists, logging engineers, and drilling personnel.
Tool string design: Ensure compatibility of the VSP tool with borehole conditions (temperature, pressure, well deviation).
Hazard assessment: Conduct risk analysis and toolbox talks.
Surface equipment setup: Confirm winch, power supply, and surface recording system readiness.

Tool String Assembly
VSP Tool Components:
Geophone or hydrophone arrays
Pressure and temperature sensors
Centralizers and clamps (to ensure tool stays in place)
Testing: Conduct surface function tests (e.g., acoustic test) to verify tool response.
Make-up: Use thread protectors and apply proper torque during tool connections.
Tool checks: Ensure zero leaks (pressure test if required).

Cable Head and Wireline Preparation
Cable head connection: Connect tool string to the wireline cable (electrical and mechanical).
Slack management: Properly manage slack to avoid entanglement.
Grounding: Ensure proper electrical grounding to prevent signal loss or damage.

Logging Winch and Data Acquisition Setup
Logging unit setup: Calibrate the VSP acquisition system (time-zero syncing with surface seismic source).
Depth correlation: Use casing collar locators or gamma ray tools to accurately position the VSP tool.
Communication check: Ensure real-time telemetry between downhole tool and surface unit.

Rigging Up at the Wellhead
Lubricator and pressure control equipment (PCE): If in a pressurized or live well, use a grease head, lubricator, and stuffing box.
Rigging through BOP (if applicable): Coordinate with rig crew for safe handling through the blowout preventer.
Lowering tool into hole: Slowly deploy to required depth station-by-station (in zero-offset or walkaway VSP).
Tool clamping: Clamp tool in place (for fixed-position VSP tools) to avoid tool movement during shooting.

Final Checks and Readiness for Shot Firing
Check tool orientation and clamping stability.
Time break synchronization: Confirm with shot crew for seismic source timing.
Verify all telemetry, acquisition, and safety systems are online and tested.