opyrighi 1995, socIcty of Petrolem, Engumms. Inc. 'hIS paper WIIS prepared fcr r senlauon at k Offshore European Conference held m AberdeeIL 5-S .Sqxembcr 19 5. This per was selected for Ptesentmon by m SPE Program Comnuttec following rewew of i$%mmwm contained in m AM..., by the mib.n'fs). bmems of this paper. as pre~med. bavc no{ ban reviewed by the Somty of Petroleum EngInccm and are subfect to correct-n by tbe author(s). The matend, as psenled, das not mcusarily reflect any position of tfx Society of Petroleum Engmesra, its officers, or members. Pafms presented at SfW meetmgs am aubfect 10 publication Kvtew by Editoriai Committee of tbc Society of Petroleum Engincms. Pcnnisaion IO copy is restricted 10 an abstract of not motw than 300 wonh. Illustrations IMY not k cooicd. The abstract shoufd contain unapicuous acknowledgement of whc& or by wlhn UK %x 1632.45 SPEUT. rpr '" scntcd. Write Librarian, SPE, P.O. ha 833S36, lhchardson, TX 750S3-3S 6, U.S.A.

Mobil North Sea Limited (MNSL) have been conducting treatments to prevent both Carbonate and Sulphate scale formation in the Beryl Field since the early 1980's. In order to effectively prevent scaling without frequent treatments, a novel method of increasing the squeeze life of the scale inhibitor has been developed. This method is based on the use of a proprietary extending agent. This results in greater retention of the scale inhibitor within the formation and substantially reduced inhibitor backflow during the initial production following the squeeze. The inhibitor is then released from the formation at a low but effective concentration over a long period of time. Following extensive laboratory studies, the first Mobil Long Life Scale Inhibitor (MLLSI) squeeze was performed on Beryl Well 9/13a-B16 in January, 1989. A squeeze life of fifteen months was obtained compared to an average life of about eight months from commercial treatments. Other wells in the Beryl Field have been treated subsequently and show improved treatment lives. The benefits of the longer inhibitor life resulting from MLLSI include reduced deferred production and substantially lower inhibitor treatment costs.