New Technical Approach on Annulus Cementing with Coil Tubing Packer in Oil well and Gas well at Mahakam Fields

Abstract

PHM fields are located in The Mahakam Delta and Offshore area in East Kalimantan, Indonesia. Most of the wells are multizones gas producers completed with cemented tubing which cover only main zone, but for shallower reservoirs are not targeted until recent years.

To unlock shallow reservoir target, annulus cementing is required as well barrier prior perforation.

There are several conventional methods of annulus cementing which have been implemented in Mahakam well intervention activities, such as:
a. Annulus cementing with balance method
b. Annulus cementing with cement retainer

Sisi nubi well is one of well case study annulus cementing with conventional method using balance method that have failure during cementing job and create cement flow back to the tubing. Consequently required additional intervention to clear access by milling and under reaming operations that cost up to USD 627,000. Well Intervention division continuously looking for new method to reduce operating time and cost efficiency.
Annulus Cementing with Coil Tubing (CT) packer is a new method to perform annulus cementing resulting clean wellbore and high quality cement in the annulus.

This method has been successfully implemented in 7 wells in Offshore field with satisfactory result.

The principle of annulus cementing with CT packer is temporary set on the well bore to prevent upward and downward movement of fluid or pressure during and after cementing operation, and also to avoid cement contamination with wellbore fluid.

Following the success in offshore field application, thus the division extend the application in the fields at Delta area.