An Efficient Technology and Solution Well Operation by Maintain Well Integrity in Offshore Field

Abstract

The point of well integrity is how to produce hydrocarbon from the source (well) to surface safely. The main goal of this paper is to keep well in operation due to gas supply and demand in the field, identify tubing/ annulus communication, mitigate any excessive annulus pressure, and corrective action of tubing casing leaks refer to industrial code and Well Integrity Management System (WIMS). One of the wells in "P" platform, namely "W" well has found a leak between production tubing and production casing ("A" annulus) and no any excessive presure from "B" & "C" annulus in this case. There is no way to shut-in the well due to gas supply and demand in our field and the well must be operate safely by conduct annulus pressure monitoring, pressure limit calculation, regular bleed-off program, and modify surface facilities. Pressure limit is calculated by determine MAASP and MOASP to ensure working pressure and bleed-off program are managed. Annulus pressure bleed-down program is one of mitigation action to manage excessive pressure in annulus. We have provided technical recommendation, specify mitigate engineering solution to reduce risks, and modify surface facilities to keep wells in operation. Based on jobs result, we have done to operate all wells safely with efficient technology, deliver fluid from 3 ½" production tubing to surface facilities, perform cost optimization, and minimize production loss. We have also performed to manage and maintain annulus casing pressure successfully related to well integrity implementation. Furthermore, In this case, there is no serious hazard during these conditions in offshore field. The paper will share success story, method, and detail procedure to keep well operation by maintain annulus casing pressure in offshore field. We have done this method by efficient technology/ solution with lower operating & construction cost and there is no production loss during operation. We confidence this method can be applied successfully not only for our field, but also other business/ operating units which has similar conditions.