CN2639520Y

CN2639520Y - Deflector-type gas lift valve

Info

Publication number: CN2639520Y
Application number: CN 03284069
Authority: CN
Inventors: 李玉良; 李翠萍; 张庆生; 王连习; 陈俊昌
Original assignee: Oil Production Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Current assignee: Oil Production Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Priority date: 2003-08-15
Filing date: 2003-08-15
Publication date: 2004-09-08
Anticipated expiration: 2013-08-15

Abstract

The utility model discloses a guiding gaslift valve suitable for intermittent gaslift oil pumping comprising an upper valve body, a middle valve body, a lower valve body and a check valve; a main valve head is arranged under the corrugated pipe of the middle valve body; a side hole is positioned at the middle part of the main valve head and an overflowing hole is positioned at the bottom; the main valve head is provided with a pilot valve head inside; and a spring is arranged between the main valve head and the pilot valve head. Through adding a pilot valve in the main valve head, the utility model can realize the swift switching under the situation of small pressure difference between the corrugated pipe and the air injection pressure and ensure the bigger size required by the valve hole. Therefore, the utility model has the advantages of having flexible and reliable switching and lifting deeper fluid cutting plug with same ground gas injection pressure.

Description

The flow-guiding type gas lift valve

Technical field

The utility model relates to a kind of gas lift valve, is specially adapted to intermittent gaslift and recovers the oil.

Background technology

The intermittent gas lift valve of oil field use at present is mainly by upper valve body, middle valve body, following valve body and ball-and-seat are formed, as shown in Figure 1, under middle valve body inner corrugated pipe, be connected with a valve head, for guaranteeing that valve opening is enough big, so that the disconnected plug of lifting liquid is to ground, just requiring has enough big pressure reduction between bellows and the gas injection pressure, cause gas lift valve switch pressure bigger, because intermittent gaslift technological requirement next stage valve body opening pressure will be higher than the closing presure of upper level valve body, operating valve bottom must guarantee that certain pressure could be lifted to ground with the disconnected plug of shaft bottom liquid simultaneously, cause the lifting degree of depth of gas lift valve limited, therefore this gas lift valve only is applicable to shallow well or the stronger well of fluid supply capacity, for deep-well, hypotonic and the not strong oil well of fluid supply capacity can't use.

Summary of the invention

The purpose of this utility model is for overcoming a kind of flow-guiding type gas lift valve that above-mentioned deficiency designs, and the intermittent gaslift oil production technology can be used in deep-well, hypotonic and well that fluid supply capacity is not strong.

The purpose of this utility model is achieved in that the flow-guiding type gas lift valve is by upper valve body, middle valve body, valve body and ball-and-seat are formed down, bellows at middle valve body has main valve head, main valve head is sitting on the valve seat, the main valve head middle part has side opening, the bottom has flowing hole, the pilot valve head is housed in main valve head, and it is sitting on the flowing hole, is provided with spring between main valve head and pilot valve head.

The front end of main valve head and pilot valve head can be circle or taper.

The utility model is by installing a diaphragm valve additional in main valve head, can be implemented in rapid switch under the less situation of bellows and gas injection pressure reduction, and guarantee the large-size that valve opening requires, but thereby have switch flexibility and reliability, same darker advantages such as the disconnected plug of liquid of ground injecting gas pressure lifting.

Description of drawings

Fig. 1 is conventional formula gas lift valve structure chart; Fig. 2 is a flow-guiding type gas lift valve structure chart;

Fig. 3 is valve body operating principle sketch in the conventional formula gas lift valve (a middle valve body partial enlarged drawing);

Fig. 4 is valve body operating principle sketch in the flow-guiding type gas lift valve (a middle valve body partial enlarged drawing);

Fig. 5 is design of string pipe figure;

The specific embodiment

The flow-guiding type gas lift valve is made up of upper valve body 1, middle valve body 2, following valve body 3 and ball-and-seat 4 as shown in Figure 2, it shows with existing gas lift valve such as Fig. 1 compares, mainly be on middle valve body 2, to finish structure to improve, bellows 5 at middle valve body 2 has main valve head 8, and main valve head 8 is sitting on the valve seat 9, and main valve head 8 middle parts have side opening 11, the bottom has flowing hole 12, pilot valve head 6 is housed in main valve head 8, and it is sitting on the flowing hole 12, is provided with spring 7 between main valve head 8 and pilot valve head 6.The front end of main valve head 8 and pilot valve head 6 can be circle or taper.

By shown in Figure 5 the flow-guiding type gas lift valve is connected on the tubing string when carrying out gas-lift production, cavity from the oil sets annular space injecting gas enters by hole 10 and hole 11, as shown in Figure 4, when pressure high to a certain degree the time pilot valve head 6 open, injecting gas enters lower chamber through hole 12 and opens valve ball on the ball-and-seat 4, injecting gas merging oil pressure is together all opened main valve head 8 like this, the disconnected plug of lifting liquid.Because side opening 11 is less, pressure reduction that need only be less can be opened pilot valve head 6, so the utility model switch pressure reduction is less.The opening pressure of a requirement time step valve is less than the closing presure of upper level in the gas lift valve course of work, injecting under the certain situation of atmospheric pressure as shown in Figure 5, guarantee that each step valve has enough pressure the disconnected plug of the liquid on it can be discharged outside the well, the switch pressure differential is more little, the gas lift valve progression that can be provided with is many more, operating valve can descend the degree of depth dark more, thereby realizes that this device can use in deep-well, hypotonic and well that fluid supply capacity is not strong in the intermittent gaslift oil production technology.

Claims

1, a kind of flow-guiding type gas lift valve, it is made up of upper valve body (1), middle valve body (2), following valve body (3) and ball-and-seat (4), it is characterized in that: the bellows (5) in middle valve body (2) has main valve head (8), main valve head (8) is sitting on the valve seat (9), main valve head (8) middle part has side opening (11), and the bottom has flowing hole (12), and pilot valve head (6) is housed in main valve head (8), it is sitting on the flowing hole (12), is provided with spring (7) between main valve head (8) and pilot valve head (6).

2, flow-guiding type gas lift valve according to claim 1 is characterized in that the front end of described main valve head (8) and pilot valve head (6) can be circle or taper.