A kind of kelly splash-proof joint
A technology for splash-proof joints and drill pipe joints is applied in the field of oil drilling valves, which can solve the problems of easy wear, easy blockage and high cost
Active Publication Date: 2017-07-25
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a kelly splash-proof joint to overcome the defects of high cost, troublesome operation, easy wear and blockage in the prior art
Method used
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[0022] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0023] like Figure 1-3 As shown, the present invention provides a kelly splash-proof joint, and the splash-proof joint is composed of a brake piston cylinder 15 , a spring check valve plate 4 and an outer cylinder 1 . The axial movement of the brake piston cylinder is controlled by tightening and disengaging the outer cylinder thread and the lower drill pipe thread; the switch of the spring check valve plate is controlled by the position of the brake piston cylinder; the outer cylinder and the brake piston cylinder are used for drilling. A sealed space is formed between them, so that the valve plate in the sealed space does not come into contact with the mud environment;...
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The invention relates to the technical field of valves for petroleum drilling, in particular to a splash-proof joint of a square drill rod. The splash-proof joint is mounted on the lower portion of the square drill rod and comprises a braking piston barrel, a spring check valve plate and an outer barrel, drill rod threads are formed on two sides of the outer barrel, an upper female buckle of the outer barrel is connected with the square drill rod while the lower male buckle of the same is connected with a drill rod joint, a valve seat is mounted at the bottom of a shoulder inside the outer barrel, a limiting sleeve is mounted on the upper portion of the valve seat, and two elastic clamping springs are mounted on the upper portion of the limiting sleeve and clamped in a clamping spring groove of the outer barrel to limit the limiting sleeve and the valve seat at corresponding positions of the outer barrel. During well drilling, a full-bore drilling liquid circulating passage with diameter phi greater than 58mm is provided; during buckle releasing, a water hole of the square drill rod is sealed, and enough pressure of an upper mud liquid column can be borne; during well drilling, a splash-proof valve plate does not contact with mud, so that prolonging of service life of the valve plate is facilitated; the splash-proof joint is simple in structure and needless of external power, and energy resources are saved.
Description
technical field [0001] The invention relates to the technical field of oil drilling valves, in particular to a kelly splash-proof joint installed at the lower part of a kelly. Background technique [0002] After drilling a single piece or pulling out the kelly, there will always be a hose and the residual drilling fluid on the upper part of the riser will flow to the drilling platform from the joint where the kelly is unloaded. This not only wastes drilling fluid, but also deteriorates the environment and endangers the health of operators. At present, two methods are usually adopted: the first method is to install a cock valve at the lower part of the kelly to avoid the above problems. However, the cock valve has the problems of high cost, troublesome manual operation, and easy to hold the pump after forgetting to open it. The second way is to install a mud splash valve with an arrow-shaped spring valve core at the lower part of the kelly. However, due to the arrow-shaped s...
Claims
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IPC IPC(8): E21B17/042E21B21/10
Inventor 王军刘伟唐立伟黄国辉张琳
Owner BC P INC CHINA NAT PETROLEUM CORP