Well washing valve capable of achieving forward and reverse circulating well washing
A technology for reverse circulation well flushing and well flushing valve, which is applied in the direction of flushing wellbore, wellbore/well components, earth-moving drilling, etc., can solve the problem of difficult to meet the needs of downhole tubing cleaning, and achieves simple structure, simple operation and convenience. effect used
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 In the following, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, on the premise of not conflicting, the various embodiments or technical features described below can be combined arbitrarily to form new implementations. example. Unless otherwise specified, the materials and equipment used in this embodiment can be purchased from the market.
 see Figure 1-4 , a well flushing valve capable of realizing positive and negative circulation flushing, comprising an upper joint part 10 and a lower joint part 20 sleeved on the lower part of the upper joint part 10;
 The upper joint part 10 is provided with a hollow cavity 11 axially penetrating its top and bottom, and the lower joint part 20 is provided with an installation cavity 21 axially penetrating its top and bottom, and the installation cavity 21 communicates with the hollow cavity 11; the upper joint part 10 ...
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