The following techniques should be used while drilling Unconsolidated Formations: 1. Obtain maximum annular velocities by using critical velocity circulating rates. 2. Use a “Clayball Trap” or a small settling tank upstream of the shakers. 3. When reaming, avoid scouring the sides of the hole with high jet velocities. When reaming with a jet bit, … Drilling Unconsolidated Formations
Ensure that a drill pipe strainer is ALWAYS in the pipe when pumping fluids into the well Ensure 4 x ditch magnets are in place for extracting milled cuttings. Prepare sweeps prior to milling operations to aid clean up. Theoretical swarf weight estimation has been noted from whipstock supplier. Consider inclusion of circulation sub in … Whipstock Milling Operation – Best Practices
Types of vessels, offshore operations, supply vessel, stand-by vessel, AST vessel – Specifications may vary from above, and capacities are approximate only. – Fuel consumption figures are given as a guide for 24 hour continuous steaming but may vary by as much as 25% between operating at maximum and economic speeds. 1 Safety/stand-by vessels Approx. … Types of vessel, offshore support
An initial kick-off and build section with smooth build rates is required to minimise torque and drag in deeper critical hole sections. The Drilling Supervisor should ensure all personnel are aware of this requirement and that potentially troublesome doglegs are wiped immediately. Doglegs and Decreasing Build Rates Excessive doglegs or a drop in build rate … Kick-off and Initial Build Section
This article describes the specifications and inspection requirements of the various BHA components for horizontal wells. Inspections requirements All BHA components should have received a full inspection prior to use on an extended reach well. Stress relief grooves are required on all components (including non magnetic components and jars). The complete BHA should be returned … BHA Components and Inspections
Checklists for the members of the rig team: OIM, Barge Master, Toolpusher, Driller, Assistant Driller, Derrick Man, Cement Operator, Mud Engineer, Mud Logger. Download HPHT Checklists – Word Document 1. OIM / Barge Master HPHT Daily Checklist prepare non essential personnel list (to be agreed with company drilling supervisor) hold morning meeting obtain copy of … Rig Team HPHT Checklists
The Mud Cap Drilling (MPD, Managed Pressure Drilling) is a technique that can be used even in case of total circulation losses. Circulation losses are traditionally cured with Loss Circulation Materials (LCMs) pills, gunk pills and cement plugs, but these methods have disadvantages: uncertain about results time consuming and expensive, potential damage to reservoirs. Severe … Planning requirements for Managed Pressure Drilling (Mud Cap)
The following directional surveying standard are recommended: All exploration wells shall be surveyed from the surface conductor shoe to TD All development wells shall be surveyed from the wellhead to at least the lowest hydrocarbon bearing zone Survey tool selection for definitive surveys shall be based on the anti-collision requirements, survey tool accuracy, target size … Directional Surveying Standards
Stretch graph for 3.5″ and 5″ Drilll Pipe are presented below: Stretch graph for 3.5″ Drilll Pipe Stretch graph for 5″ Drilll Pipe
Downsized conventional drilling is the use of a fit-for-purpose rig to drill conventionally a well with a reduced casing scheme ending in 4 3/4″ or smaller open hole, possibly with a 3 1/2″ production liner. The potential for downsizing oil wells in some fields, with cost savings of up to 35% with no loss of … Downsized conventional drilling – Slim Hole Wells