| 摘要 |
A downhole tool (10) configured to condition a borehole (B) and deliver a settable material, such as cement slurry, into a borehole annulus (A)for securing and supporting a casing string (C)in the borehole (B)comprises a body in the form of tubular housing (12), a shaft (14) rotatably mounted within the housing(12), a head portion (22) and a drive arrangement (20). In use, borehole cleaning and cementing operations may be carried out by directing a drive fluid, such as drilling mud,through the drive arrangement (20)to drive rotation of the head portion (22) to clean or condition the borehole (b). A cement slurry or the like,may then be directed through the casing string (C) or via a cementing string (S) into the shaft(14), and through the drive arrangement (20),the fluid then being ejected from the head portion (22). |
