CN202170780U - Environmentally friendly check valve - Google Patents

Abstract

The utility model relates to an environment-friendly single current valve. The main problem of current single current valve flushing back volatile effect lead to killing well operation and polluted environment of solving. The method is characterized in that: lower clutch (2) inside radially have baffle (4), baffle (4) on be equipped with a plurality of and cross liquid hole (5), be equipped with floater (3) in the cavity of lower clutch (2), top connection (1) right side inner wall identical with floater (3) external diameter. The environment-friendly check valve has the characteristics of reducing well fluid discharge and being not easy to break down.

Description

Environmentally friendly check valve

technical field

The utility model relates to the field of oil production in oil fields, in particular to an environment-friendly check valve.

Background technique

At present, the check valve is a kind of blowout prevention tool in the oil pipe commonly used in the downhole operation of the oil field. Since the existing check valve adopts the ram tension spring sealing mechanism, all the flushing fluid in the oil pipe is taken out of the wellhead during the string lifting process, resulting in an increase in sewage discharge, and the existing check valve often occurs well flushing Faults such as back tension spring failure, foreign matter stuck, ram falling off, etc. lead to the failure of blowout prevention measures and mud kill well construction, which not only prolongs the construction period but also increases the operation cost, and at the same time causes pollution to the formation and surface environment.

Contents of the invention

In order to overcome the disadvantages of existing check valves that are prone to failure after well flushing, resulting in killing operations and polluting the environment, the utility model provides an environmentally friendly check valve, which can reduce the discharge of well fluid and is not easy to characteristics of failure.

The technical scheme of the utility model is: an environment-friendly check valve, which includes an upper joint and a lower joint connected to each other. The inner radial direction of the lower joint has a baffle plate, and several liquid-passing valves are arranged on the baffle plate. hole, the cavity of the lower joint is provided with a floating ball, and the inner wall on the right side of the upper joint matches the outer diameter of the floating ball.

The utility model has the following beneficial effects: due to the adoption of the above scheme, the check valve floats up and down in the cavity through the floating ball to seal or open the oil pipe cavity. The liquid can flow back into the wellbore, reducing the pollution of the environment due to the discharge of well fluid, and realizing environmentally friendly construction.

Description of drawings:

Fig. 1 is the schematic diagram of the utility model.

In the figure 1-upper joint, 2-lower joint, 3-floating ball, 4-baffle plate, 5-fluid hole. the

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figure 1, an environmentally friendly check valve includes an upper joint 1 and a lower joint 2 connected to each other, and the upper joint 1 is placed inside the lower joint 2, and the lower joint 2 has a baffle in the radial direction 4. The baffle plate 4 is provided with a number of liquid holes 5, the cavity of the lower joint 2 is provided with a floating ball 3, and the inner wall on the right side of the upper joint 1 is arc-shaped, and its inner diameter is the same as that of the floating ball 3 The outside diameter matches.

When the check valve is going downhole, it is threadedly installed between the downhole tools such as the sand washing pipe, the wax scraper and the fishing tool and the tubing. When the floating ball 3 contacts the well fluid, it floats up under the buoyancy and cooperates with the arc-shaped inner wall of the upper joint 1 to seal the tubing cavity. The purpose of blowout prevention. When the well is flushed at the predetermined position, the pressure of the flushing fluid is greater than the pressure at the bottom of the well, and the flushing fluid pushes the float 3 away to perform well flushing. After the well flushing is completed, the floating ball 3 cooperates with the arc-shaped inner wall of the upper joint 1 again under the action of well pressure and buoyancy to seal the tubing cavity, so as to achieve the purpose of blowout prevention. When the pipe is pulled up, the pipe string releases the volume in the wellbore to reduce the pressure at the lower part of the check valve, and the float 3 opens downward under the pressure of the liquid column in the oil pipe, and the liquid in the oil pipe flows back into the wellbore to reduce the outflow of well fluid. The purpose is to realize environmental protection construction.

Claims (1)

1. environment-friendly type ball-and-seat; Comprise the top connection (1), the lower contact (2) that are connected; It is characterized in that: described lower contact (2) inner radial has baffle plate (4); Described baffle plate (4) is provided with several liquid pass holes (5), is provided with ball float (3) in the cavity of lower contact (2), and described top connection (1) right side inwall and ball float (3) external diameter match.

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