Copyight 1997. Offshore Technology ConferenceThe costs for these horizontal and deviated well This p p r was p p r e d for pesehtion at (he 1-7 Offshore Technology Conference heid intervention operations with coiled tubing or snubbing are in Horntm, Texas, 5-0 M8y 1997. excessive and in manv cases o~erations such as uroduction This paper m s s d e d for m o n h t l o n by (he OTC Prognm Commitbe folldng r d m d Informdon conblned In an a b s W 8 d 8 u b m~ by (he ~uUI WS). Contents of (he pw. as pewnted, haw not been r d d by (ha On+hora Techndogy Conf-a and are suqed to comedon by (he UJUI~(~). The m.MIal. a8 pment.d, doe8 not mce8urlIy roiled any posiUon of (he On+ha. Techndogy C o n f u m a or It8 olfican. flecbonlc repmducllon, dsMhmon, or storage d any pfl of (his paper for comrnerdal pispores wlthwt (he mttlen consent d (he Offshore Techndogy Conferma I8 pohlbltad. Pwml8don to rapoduce in plnt is restricted to an a W a d of not more than 300 word*: Illusbatlau may not be copied. The abrblcl mud conbin c a u p i c w~ ackndecbment d whera and by whom (he pper m. pesmnted. AbstractThe wireline Well Tractor
This paper describes the initial planning and pre-job laboratory testing for a gravel pack operation using coiled tubing in the Statfjord Field. The paper also describes the execution of the operations and methods involved. Potential problems related to the placement of the gravel were identified in pre-job meetings and were verified through a comprehensive test programme. A well specific cased hole completion was modelled using an acrylic gravel pack simulator, and a number of tests were performed to determine the optimum solution for gravel concentration, brine viscosity, viscosifier and slurry placement rate. The tests were utilised as an aid in designing the actual gravel placement operation. The gravel packing operation was conducted using small batches of slurry consisting of a non-viscosified brine carrier fluid along with a low gravel concentration. Two separate radioactive tracers were injected into the slurry to give better resolution of the gravel pack logs. The operation and completion technique is reviewed and verified by extensive post completion analysis. This includes calculated sand height verified by gravel pack placement logs. Initial gravel pack productivity is comparable to conventionally gravelpacked wells. Introduction The Statfjord Field is one of the largest offshore fields in the world. It is located on the boundary line between the Norwegian and British continental shelves, 200 km North West of Bergen. Production started in 1979 from one concrete gravity based production platform. Field development was completed in 1985 with three fully integrated platforms based on the Condeep design. Each platform has two drilling shafts and a total of 42 well slots. To date 124wells have been drilled including 10 redrills.
This paper gives a short introduction to the Statfjord field and background for extended-reach-drilled (ERD) and horizontal wells. We reviewed experiences with completion and workovers of horizontal and ERD wells on Statfjord. Ten horizontal wells with horizontal sections of up to 2150 m and four ERD wells with a horizontal reach of up to 7290 m were completed. Several wells were recompleted, and we performed interventions for logging purposes. We describe the development of the completion and workover techniques since the first horizontal well was drilled in 1990 to April 1994.
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