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1. (WO2006125948) APPARATUS AND METHOD FOR DRIVING CASING OR CONDUCTOR PIPE

Pub. No.:    WO/2006/125948    International Application No.:    PCT/GB2006/001692
Publication Date: Nov 30, 2006 International Filing Date: May 9, 2006
IPC: E21B 7/20
E21B 43/10
E21B 21/12
E21B 7/18
Applicants: BP EXPLORATION OPERATING COMPANY LIMITED
LUO, Yuejin
Inventors: LUO, Yuejin
Title: APPARATUS AND METHOD FOR DRIVING CASING OR CONDUCTOR PIPE
Abstract:
A method for driving pipe (1) into the ground (2), which is particularly suitable for driving conductor pipes that are commonly installed in the hydrocarbon production industry during the construction of oil wells and gas wells, more particularly offshore wells comprises: (a) assembling at the lower end of a drill string (3), (i) means for supporting a conductor pipe on the drill string (4), (ii) a reciprocable impact driving means (5), (iii) means for reciprocating the reciprocable impact driving means using fluid pumped through the drill string, (iv) an anvil (8) capable of transferring the percussive force of the reciprocable impact driving means (5) to the conductor pipe (1) and (v) means for jetting fluid (10), (b) positioning the assembly within a conductor (1) such that the assembly and conductor are supportable by the drill string and the means for jetting fluid (10) is at the lower end of the conductor (1), (c) positioning the lower end of the conductor pipe (1) on the ground (2) into which it is to be driven, (d) actuating the reciprocable impact driving means (5) to impact the anvil (8) and drive the conductor pipe (1) into the ground (2) and (e) simultaneously or sequentially jetting fluid into the lower part of the conductor pipe (1) such that it flows upwardly carrying with it particles (12) that have been forced into the conductor pipe the fluid and particles being removed from the upper part of the conductor pipe (1).