Testing and Subsea

Internship Presentation

- Shail Soni- University of Petroleum and

Energy Studies, Dehradun

Well Test Objectives

• Boundaries

• Flow Rate

• Permeability

• Reservoir Pressure

• Samples

Types of Tests

• Single Rate

• Multi Rate

• Extended Well Test

• Gas Well Test– Isochronal

– Modified Isochronal

– Flow after Flow

Ph, Hydrostatic Pressure

Pf, Formation Pressure

DST Concept

Pc < Pf

Packer to Isolate formation

Down Hole Valve to CONTROL formation (Closed)

Tubing/ Drill Pipe to Channel flow to surface

Pc, Cushion Pressure

Drill Stem Test

• Downhole Testing Equipments– Tester Fluid

– Sampler

– Gauges

– Packers

– TCP Gun

Drill Stem Test

Example String

Surface Well Testing

Subsea Safety System

• Requirement:– Well control during harsh weather conditions

– Deal with Hydrate formation

Subsea Saftey System

  Retainer Valve Lubricator valve Sub-sea Tree

Data Acquisition System

• Importance of Pressure and Temperature Data– UB /OB

– Well Performance

– Fluid Interfaces

– Reservoir Analysis

– Well Interference

Well Life and DAS

• Exploration Phase• Producibility and profitability

• Development Phase• Reservoir Continuity and Communication

• Later Stages• Reservoir life.

• Secondary recovery technique implimentations

DAS

• Types of Gauges– Mechanical

– Electronic

Sampling

• Importance of Sampling

• Types of Sampling– Surface

– Bottomhole

• Processes in Sampling– Acquire

– Transfer

– Store

– Evaluate

– Analyze

Sampling

• Types of Samplers– SPS 15

– SPS-A

• Protection against Sour Systems

Thanks!