| 摘要 |
<p>A wellhead (2) comprises an outer housing (4) and an inner housing (14) each having a central bore. The inner housing (14) has a first end within the outer housing (4). A first inner is secured at a first end in the outer housing. A port (60) is provided through the outer housing (4) in communication with the central bore therethrough, the port opening into the central bore of the outer housing (4) between the first end of the inner housing (14) and the first end of the first inner casing (20). A second inner casing (42) is secured in the wellhead (2) at a first end, whereby the port opens into the central bore of the outer housing (4) between the first end of the first inner housing and the first end of the second inner housing. An annulus (46) is formed between the first and second inner casings. The wellhead is particularly suitable for the injection of a slurry of drilling cuttings without a guide base.</p> |
