CN2272945Y - Pressure relief device for oil and gas well - Google Patents

Abstract

The utility model discloses a pressure relief device for oil and gas wells, being capable of effectively relieve transient high pressure which is generated by a perforating gun at priming in enclosed space. The utility model is mainly composed of an upper joint, a valve body, a slide valve, a pin break, a cavity body and a plug. The valve body and the slide valve are controlled by the pin break, relief holes are arranged on both the valve body and the slide valve. When the slide valve is at the position of an upper death point, the relief holes on the valve body and the slide valve can not be communicated, and the valve is in a closed state at the moment; when the slide valve is at the position of a lower death point, the relief holes on the valve body and the slide valve can be communicated, and the valve is in an open state at the moment, so that high-pressure fluid around the valve can enter the inner cavity of the cavity body through the relief holes, and accordingly, the pressure can be released.

Description

Oil gas well pressure releasing device

The utility model is applicable to oil gas well formation testing technical field in the oil field prospecting development process.

Reach in " striding " process at oil gas well " combined operation of perforation and testing technology ", after the packer set, make the perforated interval pit shaft form an enclosure space (referring to accompanying drawing 1) that is full of fluid (well killing fluid) every combined operation of perforation and testing technology.In the moment that perforating gun is ignited, the energy that the perforating bullet blast discharges will cause that this space inner fluid pressure increases suddenly, thereby downhole tool, instrument are damaged effect.

The purpose of this utility model is to provide a kind of releasing device of enclosure space inner fluid instantaneous pressure.

A kind of pressure relief device is made of pressure relieving valve and pressure release cavity, it is characterized in that:

(1) has the release of pressure passage on the pressure relieving valve; Pressure relieving valve by top connection, valve body, guiding valve, cut off, elastic washer and gun joint form, guiding valve is the cylinder of a upper end closed, has through hole on the barrel, tube is outer to have annular and cuts off groove; Valve body be one columnar structured, have through hole on the barrel and cut off the hole, at upper and lower having " O " ring recess of through hole and " O " RunddichtringO is housed, its up and down respectively car the male and female screw thread is arranged; Guiding valve is loaded in the valve body and is spacing by cutting off, and cuts off the hole of passing on the valve body that cuts off and inserts the groove that cuts off on the guiding valve, and at this moment, through hole on the guiding valve and the through hole on the valve body are separated by " O " RunddichtringO; Valve body all is threaded with gun joint with top connection, valve body, the sealing of " O " RunddichtringO; The aperture of top connection and gun joint is all less than the external diameter of guiding valve.

(2) has the release of pressure space in the pressure release cavity; Pressure release cavity is made up of cavity and plug; Cavity is all used with plug with pressure relieving valve, cavity and is threaded, the sealing of " O " RunddichtringO.

Can directly be connected on the perforating gun lower end when this device is used for " combined operation of perforation and testing technology ", be used for " striding " Shi Zejia and be connected between perforating gun and the lower packet every combined operation of perforation and testing technology.

Should " pressure relief device " form by pressure relieving valve and pressure release cavity two parts.Pressure relieving valve is in closed condition, absolutely empty isolation of release of pressure cavity space and outer shroud before perforating gun is ignited.In the pressure release cavity is atmospheric air, in the moment that perforating gun is ignited, the rifle internal pressure that the perforating bullet blast causes increases, pressure relieving valve is opened, the release of pressure cavity space and the annular space external space are linked up, outer annular space fluid flows into pressure release cavity, and this space that is full of that is equivalent to seal annular space amount fluid decided at the higher level but not officially announced increases, thereby reaches the purpose that reduces its pressure.

The utlity model has following advantage:

Simple in structure, advantages such as maintenance is convenient, reliable, the easy processing of functional safety that this device has.

Be described in further detail below in conjunction with the structure and the course of work of accompanying drawing this device.

Fig. 1 is the installation drawing of the utility model when being used for combined operation of perforation and testing technology

Fig. 2 is that the utility model is used to stride the erecting device every combined operation of perforation and testing technology

Fig. 3 is that the utility model is closed sectional view

Fig. 4 is that the utility model is opened sectional view

Among the figure: 1, top connection; 2, cut off; 3, sealing ring; 4, valve body; 5, sealing ring; 6, guiding valve; 7, elastic washer; 8, gun joint; 9, cavity; 10, plug.

As shown in the figure, have top connection (1) in the pressure relieving valve, valve body (4), guiding valve (6), cut off (2), elastic washer (7) and gun joint (8) have through hole on guiding valve (6) barrel, have annular outside the tube and cut off groove, valve body (4) be one columnar structured, have through hole and shearing perforation on the barrel, have " O " RunddichtringO in " O " type groove up and down of through hole, pressure release cavity inner chamber body (9) and plug (10) are by being threaded.

In the pressure relieving valve: guiding valve (6) can be taken back slip in valve body, and it deposits the stop bit that walks to the lower end by the upper end stop bit and puts (seeing Fig. 3 and Fig. 4), promptly finishes pressure relieving valve by being closed to the state conversion of opening.

Claims (1)

1. an oil gas well pressure releasing device is made of pressure relieving valve and pressure release cavity, it is characterized in that:

(1) has the release of pressure passage on the pressure relieving valve; Pressure relieving valve by top connection, valve body, guiding valve, cut off, elastic washer and gun joint form, guiding valve is the cylinder of a upper end closed, has through hole on the barrel, tube is outer to have annular and cuts off groove; Valve body be one columnar structured, have through hole on the barrel and cut off the hole, at upper and lower having " O " ring recess of through hole and " O " RunddichtringO is housed, its up and down respectively car the male and female screw thread is arranged; Guiding valve is loaded in the valve body and is spacing by cutting off, and cuts off the hole of passing on the valve body that cuts off and inserts the groove that cuts off on the guiding valve, and at this moment, through hole on the guiding valve and the through hole on the valve body are separated by " O " RunddichtringO; Valve body all is threaded with gun joint with top connection, valve body, the sealing of " O " RunddichtringO; The aperture of top connection and gun joint is all less than the external diameter of guiding valve;

(2) has the release of pressure space in the pressure release cavity; Pressure release cavity is made up of cavity and plug; Cavity is all used with plug with pressure relieving valve, cavity and is threaded, the sealing of " O " RunddichtringO.

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