Scope It covers the visual examination, of the internal and external surfaces of drill pipe, to determine, the general condition. Apparatus Paint marker Depth gauge Light capable of illuminating the full length of the internal surface Preparation All pipe should be numbered sequentially Surface shall be clean and the metal surface clean. NO surface particle … Continue reading Visual Inspection
Tag: Drilling
Drill Pipe Inspection
SCOPE This document recommends standards procedures for conducting an inspection program on drill stem components. Inspection and disassembly of equipment such as jars, and hole openers are not covered. PURPOSE To reduce inspection errors. The program defines: What method to use on which component A step by step procedure for each method What defines acceptable … Continue reading Drill Pipe Inspection
Spontaneous Potential (SP)
Spontaneous Potential (SP) This is a record of the direct current voltage differences between the naturally occurring potential maintained by a movable electrode in the borehole and a fixed potential located at the surface. The potential is as a result in the difference between the salinity of the drilling and formation fluid. The SP log … Continue reading Spontaneous Potential (SP)
Sedimentary Environments
Facies A body of rock with specific characteristics. Defined on the basis of colour, bedding, composition, texture, fossils and sedimentary structures. Facies Sequences A sequence of facies as the pass from one to another. The sequence can have an abrupt or erosive boundary or a hiatus. In this case there is a coarsening upward sequence … Continue reading Sedimentary Environments
Wellbore Tubulars
Casing hanger – this is installed to support the individual casing strings in the well. This is the landing base or casing head. This is usually welded or screwed to the top of the surface casing string. The surface casing string serves as a foundation pile for the well. This transfers the hanging load to … Continue reading Wellbore Tubulars
Pipe Handling Procedure
Handling Always make sure that thread protectors are properly in place/fastened. In the event of the drill pipe lacking the thread protectors the pipe should be marked for inspection Care should be taken for special service drill pipe or such equipment with special coatings. Use rope slings to control pipe when off loading by hand. … Continue reading Pipe Handling Procedure
Mud Motor Operations
Motor check prior to operation. Drill bit jet size check Operation of the bypass valve While tripping into the hole, circulation should be broken every 20 to 30 stands to keep the motor running freely. At total depth and before drilling circulation is begun and set to close the bypass valve and start the motor … Continue reading Mud Motor Operations
A Guide to Bit Running Procedure
Rig Site Protocol PPE Sign In Reverse Park Vehicle Present yourself to Company personnel State purpose of visit Explain objectives and plan Rig and Surface Equipment Evaluation Solids Control Equipment Ineffective or too few shakers can limit the speed at which cuttings can be removed from the mud system. This may result in lowered penetration … Continue reading A Guide to Bit Running Procedure
Effect of bit on Rotary Assembly
Roller Cone – makes very little difference on the build, hold or drop angle. This type of bit does influence the walk rate. They have a right walk tendency, long tooth bits exhibit this more than short tooth bits. PDC – no walk occurs. They do affect the inclination. The gauge length of the … Continue reading Effect of bit on Rotary Assembly
Control with a Rotary Assembly
Side Force and Tilt Essentially these are the forces and angles that determine and influence where the bit goes. Bit Trajectory Stabilizer gauge and placement Drill Collar length and diameter Weight on bit Rotary Speed Bit type Formation Flow rate Rate of penetration Build Assemblies To increase the build rate – longer distance between near … Continue reading Control with a Rotary Assembly
Why Cement (a wellbore)?
The reasons are as follows; To support the vertical and radial loads applied to the casing Isolate porous formations from the producing zone formations Exclude unwanted sub-surface fluids from the producing interval Protect casing from corrosion Resist chemical deterioration of cement Confine abnormal pore pressure Cement is introduced into the well by means of a … Continue reading Why Cement (a wellbore)?
Petroleum Geology
Basics 3 basic layers that make up the earth; core, mantle and the crust. The crust is the most important and it is divided into two distinct types; Continental – 16-48km thick Oceanic – 8-11km thick Orogeny – when the crust is built layers fold over each other and are pushed upward. Weathering Physical – … Continue reading Petroleum Geology
(Oil)Well Bore Packers
 Packer Applications               Casing Protection               Separation of multiple Zones               Isolation Packers               Elimination of Surging and heading               Sub-surface safety control               Artificial/Gas LiftThere are three types of packers; mechanical and hydraulic set and permanent. All packers fall into one or a combination of these.Mechanical Set Packers- These are set by some form of tubing movement, usually a rotation … Continue reading (Oil)Well Bore Packers
Rotary Assemblies
 Rotary Assemblies Usually used where formations are predictable and rig economics are an issue. In such an assembly the weight of the drill collar gives the bottom hole assembly the tendency to sag or flex to the low side of the hole, collar stiffness length and stabilizer diameter and placement are engineered as a means … Continue reading Rotary Assemblies