| 摘要 |
<p>The invention provides for a jetting tool for use with a drillstring. The tool generally includes a tubular main body having an inlet and an outlet arranged in fluid communication via a fluid conduit, the main body defining at least one aperture along its length. The tool also includes an elongate outer ring assembly configured for fitment about the main body to enclose the at least one aperture. This ring assembly defines an upper circumferential fluid port and a lower circumferential fluid port, each port configured to operatively direct fluid towards the other. The tool also typically includes a valve assembly receivable inside the fluid conduit, the valve assembly displaceable between a drilling position, wherein fluid is able to pass from the inlet to the outlet via the fluid conduit, and a jetting position, in which fluid is diverted from the inlet to the upper and lower fluid ports via the aperture. The valve assembly is configured to displace to the drilling position upon receiving an activator body via pressurised fluid through the drillstring.</p> |
