1 Management summary This document provides background information on the subjects of relief well planning, homing-in logging method selection, logging optimization and analysis of the obtained information. Knowledge of the capabilities and limitations of homing-in logging should allow to develop a blowout contingency/abandonment plan at an early stage of well planning. In particular for slimhole … Relief Well – Homing-In
this article describes the contingency Stock Levels for Well Control. Contingency Fluid Requirement for contingency fluid for onshore operations depends on proximity of supply base. For offshore operations, in order to sustain control in case of severe losses, sufficient contingency fluid stock has to be kept on site. A minimum stock of contingency fluids (excluding … Contingency Stock Levels – Well Control
Hydrogen sulphide (H2S) is one of the most toxic of all naturally occurring gases. It occurs world-wide in various concentrations in the scope of the drilling industry. It is explosive and heavier than air. In small concentrations it has an offensive rotten egg odourwhile greater concentrations can paralyse the olfactory nerves so no odour is … Hydrogen Sulphide (H2S)
The gas readings are obtained by the mud loggers from gas analysis equipment and are classified according to the operation that releases the gas into the borehole (background, drilled, connection, trip, etc.) 1. Definitions Drilled gas: Gas that is produced from the volume of cutting drilled. It is usual to record peak drilled gas level … Mud Log Gas (background, drilled, swab, connection, trip)
During drilling and workover operations the consequences of leaks or kicks with sour gas or crude may be very serious. Personnel can be incapacitated by relatively low concentrations of H2S in a very short time and equipment can suffer catastrophic failure due to H2S embrittlement. The H2S risk depends primarily on the H2S content of … Well Control – H2S
This article describes the standards applicable for Well Control. General Standards All wells drilled shall comply with the guidelines as specified in API RP 53. All pressure containing well control equipment shall comply with API RP 53 and NACE MR-01-75. The standard shut in procedure to be used in all well control situations is the … Well Control Standards
Shallow gas is defined as any hydrocarbon-bearing zone which may be encountered at a depth close to the surface or mudline. Generally it is not possible to close-in and contain a gas influx from a shallow zone because weak formation integrity may lead to breakdown and broaching to surface / mudline. This situation is particularly … Shallow Gas – Planning Guidelines
The Maximum Allowable Annular Surface Pressure (MAASP) equals the formation breakdown pressure at the point under consideration minus the hydrostatic head of the mud/or influx in the casing. During well control operations the critical point to consider is the casing shoe. MAASP = Formation BreakDown Pressure – Head of mud in use or MAASP = … Calculation of Maximum Allowable Annular Surface Pressure (MAASP)
Three types of drills are to be exercised, one while drilling with the kelly on the string, one normally while tripping without the kelly on the string and one with the bit off bottom ie.: Kick Drill While Drilling (pit drill) Kick Drill While Tripping (trip drill) Kick Drill While Bit Off Bottom (strip drill). … Well Control Drills and Exercises
This article describes the planning issues to be addressed to ensure successful well control. Kick Control Work-Sheet A kick control worksheet shall be used to pre-record the data required for secondary control and shall be kept updated while maintaining primary control. The frequency of updating shall be determined by rate of change of parameters involved … Pre-Kick Planning