| 摘要 |
<p>A hydraulically-controlled multi-switch valve comprises an upper central pipe (1) and a lower central pipe (2) which are coaxially connected together. A piston sliding sleeve (3) is matchingly sleeved on the outside of the pipes, and a liquid inlet chamber (18) and a liquid outlet chamber (19) which are sealingly separated from each other are formed between the piston sliding sleeve (3) and the lower central pipe (2). The piston sliding sleeve (3) and the pipe wall of the middle portion of the upper central pipe (1) are provided with a sliding sleeve circulation hole (6) and a circulation hole (5), respectively. A positioning instrument for positioning the hydraulically-controlled multi-switch valve comprises a positioning joint and a positioning device. The positioning joint is a short section connected to the lower end of the lower central pipe. The inner circumferential wall of the middle of the short section is provided with an annular groove. The positioning device is matchingly sleeved in the short section, and the upper end face and the lower end face of an embedded tile arranged on the positioning device are in matching contact with the inner wall of the upper portion and the inner wall of the lower portion of the groove, respectively. The hydraulically-controlled multi-switch valve and the positioning instrument therefor can be used in a vertical well of an oil field, and in particular in a water exploration and separation pipe string and a multifunctional well-completion pipe string of a horizontal well.</p> |
