The correct selection, engineering and maintenance of drilling fluids is critical to the success of the drilling operations. Each member of the rig team must understand their responsibilities to ensure: the work required to mix and/or treat the drilling fluids is carried out safely and economically any discharges are handled in an environmentally responsible manner … Drilling Fluids Responsibilities

For the calculations the following parameters have been used: 26in and 16in holes: MW 9.3ppg, PV 4, YP 10 12.1/4in and 8.1/2in holes: MW 10 ppg, PV 8, YP 11 9.1/2in drill collars have been used in the 12.1/4in section For jet selection it has been taken into consideration that lost circulation is frequently occurring … Example Hydraulic Optimisation Programme

The minimum stock requirements listed in the following tables shall be at the rig site prior to spud and maintained at all times. Note: The approval of the Superintendent Operations is required to continue operations if these stocks are not available on site. Offshore Stock Requirements Item Minimum Requirement Barite 70 tons Cement 1 000 … Minimum Stock Requirements

This document describes the key elements for drilling fluids policy. Mud Weight The mud weight (ppg) shall be maintained as per the drilling programme and should provide a minimum overbalance of 75 psi for oil wells and 150 psi for gas wells. Mud Properties All mud properties shall be maintained as per the Drilling Programme … Mud Policy

The following table presents the main drilling fluid functions and properties.     FUNCTION RELEVANT PROPERTY OF MUD AND RIG SYSTEM EFFECT OF PROPERTY ON PENETRATION RATE AND BOREHOLE   EFFECTIVE CONTROL     1)  Removal of drilled cuttings from the hole a)   Annular Velocity a)   If excessive may create washouts in unconsolidated formations. a)   … Drilling Fluid Functions and Properties

To optimize hydraulics and achieve sufficent hole cleaning the following guidelines should be adhered to: Pressure Losses Through System P1= Frictional losses in surface lines P2= Frictional losses in Drillpipe P3= Frictional losses in Drill collars PB= Pressure loss across bit P4= Annular pressure loss across Drill collars P5= Annular pressure loss across Drillpipe Surface … Hydraulics Optimization – Hole Cleaning

In order to mix the mud for the drilling of a well it is necessary to maintain sufficient stock levels at the rigsite. It is vital that stock levels are regularly monitoring through frequent inventory checks to ensure that stock levels meet operation requirements. Mud product inventories as shown below shall be updated weekly by … Mud Products Inventory Form

1. Responsibilities for Routine Monitoring of the Drilling Fluid The Toolpusher shall ensure that a suitably trained crew member is in attendance at the shale shaker and active pit at all times while circulating. The Drilling Supervisor shall determine and inform the Mud Engineer and Drilling Contractor of the required mud gradient to ensure the … Drilling Fluids: Monitoring and Reporting

Mud density will decrease with increasing temperature, and increase with increasing pressure. Theoretical models similar to those mentioned in SPE Paper 11118 predict that temperature is the major effect. In an attempt to validate the model, the density of a sample of field mud was measured downhole temperatures and pressures. While drilling with 977pptf IOEM, … Downhole Density Measurements