Corrosion In Oil Wells During Acidisati
CORROSION PROBLEM DURING ACIDIZATION IN OIL WELLS AND THEIR REMEDIAL STEPS
Submitted to Dr. S. Vishwanathan Sir Dept. of Applied Chemistry
Submitted By-
Jyotirmay Mohanta
Admn. No. 9520 Semester Vth
B. Tech. Petroleum Engineering
Session 2009-10
CONTENTS
Introduction
Methods of acidization Corrosion during acidization job - Acid corrosion (causes and mechanism) Remedial steps to reduce corrosion - Use of Arcasolve™ in Acidizing Processes - Use of corrosion inhibitors References
INTRODUCTION
Acid treatments have been applied to wells in oil and gas bearing rock formations for many years. Acidizing is probably the most widely used work-over and stimulation practice in the oil industry.
By dissolving acid soluble components within underground rock formations, or removing material at the wellbore face, the rate of flow of oil or gas out of production wells or the rate of flow of oil-displacing fluids into injection wells may be increased.
Corrosion remains a major challenge to maintaining the integrity of both newly built as well as ageing facilities to cope with the escalating oil and gas production. The increasing use of secondary oil recovery has raised the levels of reservoir souring and water cut, thus necessitating more intricate material selection and corrosion control. The greatest challenges are at the subsurface level where environments are more severe and operational procedures, such as acidizing and cementing, have a greater impact on corrosion.
TYPES OF ACIDIZATION
Two primary requirements that an acid must meet to be acceptable as a treating fluid:
(1) it must react with carbonates or other minerals to form soluble products, and
(2) it must be capable of being inhibited to prevent excessive reaction with metal goods in the well.
Two basic types of acidizing operations can be conducted: Sandstone matrix acidizing, employing mud acid systems, is
Submitted to Dr. S. Vishwanathan Sir Dept. of Applied Chemistry
Submitted By-
Jyotirmay Mohanta
Admn. No. 9520 Semester Vth
B. Tech. Petroleum Engineering
Session 2009-10
CONTENTS
Introduction
Methods of acidization Corrosion during acidization job - Acid corrosion (causes and mechanism) Remedial steps to reduce corrosion - Use of Arcasolve™ in Acidizing Processes - Use of corrosion inhibitors References
INTRODUCTION
Acid treatments have been applied to wells in oil and gas bearing rock formations for many years. Acidizing is probably the most widely used work-over and stimulation practice in the oil industry.
By dissolving acid soluble components within underground rock formations, or removing material at the wellbore face, the rate of flow of oil or gas out of production wells or the rate of flow of oil-displacing fluids into injection wells may be increased.
Corrosion remains a major challenge to maintaining the integrity of both newly built as well as ageing facilities to cope with the escalating oil and gas production. The increasing use of secondary oil recovery has raised the levels of reservoir souring and water cut, thus necessitating more intricate material selection and corrosion control. The greatest challenges are at the subsurface level where environments are more severe and operational procedures, such as acidizing and cementing, have a greater impact on corrosion.
TYPES OF ACIDIZATION
Two primary requirements that an acid must meet to be acceptable as a treating fluid:
(1) it must react with carbonates or other minerals to form soluble products, and
(2) it must be capable of being inhibited to prevent excessive reaction with metal goods in the well.
Two basic types of acidizing operations can be conducted: Sandstone matrix acidizing, employing mud acid systems, is