This paper details an innovative technology to carry out logging operations in short string side of the dual completion wells. A program was initiated to carry out production logging in a Kuwait carbonate reservoir that recently began a secondary recovery project. The ability to measure zonal contributions and water entry in the target flood zones is critical for flood monitoring, designing future conformance control operations and profile modification jobs. Most of the wells in the waterflood area are completed with dual tubing strings. The production logging target interval is generally in the short string of the dual completion, making wireline logging difficult due to the risk of entanglement with long string. Another concern is the fluid flow profile in the constricted area between two packers due to the presence of long string. Generally such surveillance requirements are hardly attempted, and this is considered as one of the major drawback of dual completion system itself. A program was developed to record production logging in the short string side of a dual completion well. Coiled tubing with straightened bottom and threaded cable was used to convey production-logging tools in the short string. Several safety features were added to this system in order to ensure safe data acquisition. Upon success from first trial, the same procedure was repeated in several wells and results are quite encouraging. Details of the initial obstacles that were faced in the beginning of the project and the methods used to resolve them will be discussed in this paper. The acquisition and processed results will be also discussed. It is worth mentioning that, all logging operations were successful and no operational problems encountered so far. Introduction The Sabiriyah structure is an elongated, north trending, faulted anticline with numerous grabens and associated relay ramps covered over an area of about 237 sq. Kilometers. Sabiriyah field consists of three major reservoirs: Mauddud, Upper Burgan and Lower Burgan. The Sabiriyah field was first brought on production in the 1950's and produced intermittently on primary recovery up through the Iraqi invasion of Kuwait. Many of the wells in the field were sabotaged and were redrilled or recompleted. The Mauddud carbonate is the shallowest horizon under development in the field followed by Upper Burgan and lower burgan sandstones. Beginning in late 2000, a secondary project was initiated in the Mauddud and Upper Burgan using inverted 9 spot patterns. Twelve patterns cover the crest of the field for the first phase of secondary development (Figure 1).

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractMost of the wells in Sabriya Field (Northern Kuwait) produce from reservoirs, where multiple layers are opened to production. Problems related to non-desired water production are drastically affecting the oil production, and have been an ongoing concern. The exclusion of this water represents a challenging task by itself especially in case of multiple zones interval simultaneously producing, and where completion of the wells restricts considerably the convoyed down-hole tools configuration This paper covers water shut off case history of an oil producer that has shown according to the production data an increasing water production figures. The nature of water problem and the fact that the targeted section is located inbetween multiple oil producer zones revealed the necessity of a complex thru tubing zonal isolation solution before performing the water shut-off treatment. Temporary coiled tubing conveyed straddle system was created using two thru tubing inflatable packers, isolating the top and bottom perforated zones in order to provide both proper zonal isolation and accurate treatment placement. The post water shut off treatment showed up to 70% water flow reduction from the targeted layer has been achieved.

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractMost of the wells in Sabriya Field (Northern Kuwait) produce from reservoirs, where multiple layers are opened to production. Problems related to non-desired water production are drastically affecting the oil production, and have been an ongoing concern. The exclusion of this water represents a challenging task by itself especially in case of multiple zones interval simultaneously producing, and where completion of the wells restricts considerably the convoyed down-hole tools configuration This paper covers water shut off case history of an oil producer that has shown according to the production data an increasing water production figures. The nature of water problem and the fact that the targeted section is located inbetween multiple oil producer zones revealed the necessity of a complex thru tubing zonal isolation solution before performing the water shut-off treatment. Temporary coiled tubing conveyed straddle system was created using two thru tubing inflatable packers, isolating the top and bottom perforated zones in order to provide both proper zonal isolation and accurate treatment placement. The post water shut off treatment showed up to 70% water flow reduction from the targeted layer has been achieved.