Practical Well Planning and Drilling ManualFull description
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Practical Well Planning and Drilling Manual
Describir todos los aspectos Operacionales y de Ingeniería, que son necesarios para la Planificación de un Programa de Perforación, (Well Planning), así como los requerimientos para la …Descripción completa
• Did geological study of the Jaisalmer Basin, Western Rajasthan. • Learnt about basic processes undertaken for drilling, production, logging and reservoir operations. • Got acquainted wit…Full description
Practical Well Planning and Drilling ManualFull description
Descripción: Una revisión de sus principios y su puesta en práctica
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Prepared by Y. MADI
FOREWORD The present document is devised for non experienced engineers acting in drilling field engineering. The course is composed on sequences related to drilling operations in order to make hole, to stabilize the wall formations and to keep under control oil wells. As the completion of the program, the engineers will be able to understand: Well planning Drill String Casing design Cementing job Wellheads and BOP Well Control
Well Implantation Well Coordinates Preparation of the Rig site
WELL PLANNING Well Planning is defined as the drilling program to drill a well from the rig site to the target. This program is also called "Architecture". It includes all operations involved to build the well such as casing, cementing, well control and safety. Well Planner Engineers are responsible to elaborate the drilling program taking into account the cost, the duration with the respect of the environment. To perform this task, they need to gather many informations and work with a team composed by Geologists, Log engineers, Reservoir engineers, Production engineers, Drillers, Mud engineers The main required data is the Lithology that shows all formations to be drilled from the surface to the target. Based on this lithology, the team work is able to: Identify the nature of formation (sand, clay, sandstone, dolomite .) Estimate the thickness of layers Estimate the Dip of layers Detect weak zones Presence of undesirable fluids contained in the formation Detect faults, anticlines .. …
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WELL PLANNING The total depth to reach the target is
required to plan the well path. The size of the tubing needed to produce the oil is very important data given by the Production Department. The drilling program permits to determine : The number of drilling sections The depth of each section The diameters of bits The diameters of casings The type and properties of the drilling fluid Based on the oilfield experience, the drilling program is composed from 3 to 5 sections. Exploration : sections Development : 4 sections •
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CASING PROGRAM Formations
t f 0 0 0 1 x h t p e D e l o H
Mud Weight ppg
Casing
How to elaborate Well Planning Data Lithology Total Depth Production diameter
Example : Drilling program of 4 sections
Start from the last section where the production diameter is given (known). This diameter is C4 (Casing diameter)
To drill the section, the drilling bit diameter is D4 (Drilling diameter)
Clearance J1
J1
C4 D4 4th Section
Clearance J1 : Clearance between the bit diameter and the outside diameter casing in the same section. This clearance vary from 11/2 to 4" J2 : Clearance between the inside diameter casing and the bit diameter for the next section. The minimum clearance may be : 1/8 " casings 41/2 to 85/8 5/32 " casings 95/8 to 133/8 3/16 " casings 16" to 20" D4 =
+ 2 J1
C4
rd
3 Section : ic3 = D4 + 2 J2 where : ic3 inside diameter casing ec3 = ic3 + 2 e where e : outside diameter casing and e : wall thickness of the casing D4= ec3 + 2 J1
