1 2 well planning programming

Well Planning Overview• Session Objectives; – By the end of this session, you should be able to: drilling... Well Planning Overview• Introduction; – Well Planning is one of the most dema

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Well Planning Overview

Well Planning Overview

• Contents;

– Session Objectives, – Introduction,

– Well Planning Requirements, – Classification of Well Types, – Data Gathering,

– Well Plan Format.

Well Planning Overview

• Session Objectives;

– By the end of this session, you should be able to:

drilling.

Well Planning Overview

• Introduction;

– Well Planning is one of the most demanding areas of

Drilling Engineering,

– It requires the integration of various engineering

disciplines, corporate polices and personal experience,

– The process may vary within drilling industry, but the

final aim is to drill a well safely that satisfies the objectives set out in the well proposal,

– Well Proposal is usually issued by Petroleum Engineers

and describes well objectives

Well Planning Overview

• Well Planning Requirements;

– Main requirement for well planning is to ensure that a

program is put together for drilling a well that has, at least, the following characteristics:

– It is not always possible to accomplish these factors due to:

Well Planning Overview

• Well Planning Guidelines - Safety ;

– Sufficient Hydrostatic Head with fluid in hole - correct

density!

– Blow Out Prevention Equipment in good condition – Casing designed to contain max anticipated pressure – No kicks or swabbing

• Normal Operations vs Kick

Well Planning Overview

• Consequences of kicks !

Well Planning Overview

Well Planning Overview

• Well Planning Guidelines - Production & Cost;

– Completion starts with the first turn of the Bit!

(36”, 26”, 17 1/2”, 16”, 12 1/4”, 8 1/2”, 6”, 3 3/4”)

– Bigger diameter hole does not mean larger production, – Need to balance contingency vs cost,

– Well cemented production casing - no remedial work, – Usable inside diameter - just big enough for ;

– Completion string -tubing size vs pressure, special

equipment (SSV, packer, dual string etc.)

Well Planning Overview

• Classifications of Well Types;

– Purpose :

• Exploration (Wild Cat): These are wells drilled in an area

that has not been explored before (No offset data, very little geological and pressure data available).

• Appraisal: These wells are drilled to determine how large

the reservoir is (Some offset data always available).

• Development: These wells are drilled to enter a known

productive portion of the reservoir (Good offset data available),

– Profile :

Well Planning Overview

• Data Gathering for Well Plan;

– The following set of information needs to be gathered for well planning and are generally taken from offset wells;

• Bit records,

• Casing shoe depth,

• Electric and mud logs,

• Drillstem tests,

• Mud recaps,

• Drilling times,

• Hole problems,

• Bottom hole target

Well Planning Overview

• Well Plan Format;

– Introduction:

– Program:

depths, cement, floating equipment, wellhead, mud, bits, hydraulics, logging and step by step drilling procedure.

Well Planning Overview

• Well Plan Format ;

– Detailed Design Data:

program (Casing & Hydraulic designs).

– Testing Procedures:

procedures (offshore).

– Vendor Recommendations:

with inventory.

Well Planning Overview

• Well Plan Format - Additional;

– Offset Well Data, – Permits, Plots, Government Regulation, Safety:

excellent items to include in well planning.

– Prespud Meeting info, – Well History File:

has been drilled (DEE process),

Well Planning Overview

• In Summary;

Bit program

Drilltime Projections Cost Estimation

Well Planning Overview

• Now YOU should be able to;

– State the basic goals of well planning in terms of safety,

cost and product quality,

– List main well types and describe basic information

included in a well plan,

– Identify sources for each type of information, – Describe a format of a well plan generally available prior

to drilling

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Well Planning Overview

End of Lecture