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oWell Completion is the process of making a drilled well ready for production.
oIt involve casing ,cementing, running tubing and its tools and perforating
oOpen hole completion
Casing is set above pay zone and well has only charismas tree and no tubular equipments and
oCased hole completion
Pay zone is cased and well has tubing and downhole equipments
Locator Seal Assembly
Sliding Sleeve Door
Sub-Surface Safety Valve (SSSV)
Nodal analysis is a methodology to analyze the production system as a unit to
calculate its capacity.
The purpose of nodal analysis is to:
design each component of the production system,
detecting production restrictions and
calculating the effect of changing one or more components on the capacity of
Possible Pressure Losses In Production System
Loss in porous medium
Loss across the completion
Loss across the restriction
Loss across the safety valve
Loss across the choke
Loss across the inflow line
Total loss in tubing
Total loss in flow line
POSSIBLE PRESSURE LOSSES IN A PRODUCTION SYSTEM
Pipesim is a Production Optimization software used to
Design Pipeline & Facilities,
Do Well Performance Analysis
Noda analysis Case study
Given the following hypothetical data, does a Nodal Analysis operation for a given outlet
(wellhead) pressure to determine the operating point flow rate and BHP and the absolute open
flow potential (AOFP) of the well?
Black Oil PVT Data well bore deviation data Reservoir data
Water cut 15%
GOR 600 scf/stb
Gas S.G 0.5
Water S.G 1.08
Oil API 33 (API)
Measured depth(ft) True vertical depth (ft)
Reservoir pressure 3400 psia
Productivity index 8 stb/d/psi
By inspecting plot following results are obtained.
Operating point flow rate = 9600 stb/d
Operating point BHP = 1907 psia
AOFP = 15114 stb/d
PROSPER (PRO= Production, S=System, PER=Performance)
It is a well performance, design and optimization program for modeling oil and gas wells.
PROSPER can assist the production or reservoir engineer to predict tubing and pipeline
hydraulics and temperatures with accuracy.
It is more reliable as it include PVT data.
DRILL STEM TESTING (DST)
A drill stem test (DST) is a temporary completion of a wellbore that provides
information on whether or not to complete the well. Zone is isolated by packers.
Data obtained from a DST includes :
oformation properties, including permeability (k), skin (S), and radius of
Stimulation is a process to open up new channels in the rock for the oil and gas
to flow through. Stimulation is used to increase permeability or to restore
Two stimulation techniques are used:
In acidization, acids are injected into well to increase permeability near the well bore. There
are two types of acid treatment:
i)matrix stimulation ii) Acid fracturing
Matrix Acidization: In this process acid is pumped into the well and into the pores of the
reservoir rocks at pressure below the formation fracture pressure.
In carbonate reservoir HCI is used.
In sandstone mud acid (HCL+HF) is used.
Acid Treatment design
Acid design for matrix acidization include:
Pre-flush: are used ahead of an acid treating solution, to prepare or condition
Main treatment: It includes HF to dissolve clay / sand and HCl to dissolve
Post-flush : It is used to make the formation water wet and to displace acid
away from wellbore
Displacing fluid : It is fluid such as nitrogen, used to displace the acids to its