Patent ID: 7013970
Filing Date: 2006-03-21
Classification: E21B

Abstract:
1. A completion system comprising: a wellhead housing which is mounted on a casing string that is installed in a well; a christmas tree which is mounted on the wellhead housing; a tubing hanger which is landed and sealed in a vertically extending through bore in the tree; a first tubing string which is suspended from the tubing hanger within the casing string; and a second tubing string which is expanded into sealing engagement with the casing string over at least a portion of their lengths; wherein the annulus defined between the first and second tubing strings serves as a production bore for conveying produced fluids out of the well and the first tubing string serves as a well service conduit; wherein the tree comprises a production conduit which communicates with the production bore below the tubing hanger seal and a service/circulation conduit which communicates with the first tubing string; and wherein fluids may be communicated between the first tubing string and the service/circulation conduit independent of any crossover conduit that may be connected to the production conduit.