CN210105831U

CN210105831U - Novel constant-current blanking plug

Info

Publication number: CN210105831U
Application number: CN201920608716.8U
Authority: CN
Inventors: 张敬琪; 楚美欧; 张燕
Original assignee: Daqing Bao Oil Technology Co Ltd
Current assignee: Daqing Bao Oil Technology Co Ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-02-21
Anticipated expiration: 2029-04-29

Abstract

The utility model discloses a novel constant current blanking plug, including shell, the balanced capsule of going up, current-limiting water injection well choke, lower balanced capsule, the inside upper end of shell is equipped with drags for the pole, it is equipped with the pressure cap to drag for both ends about the pole, it is equipped with the location concave wheel to press the cap lower extreme, location concave wheel lower extreme is equipped with balanced capsule, it is equipped with the spring to go up balanced capsule lower extreme, the spring lower extreme is equipped with the piston, the utility model discloses simple structure, convenient to use comprises two airtight independent hydraulic pressure chambeies of last balanced capsule, spring, piston, lower balanced capsule, current-limiting end cap and shell, and inside is full of silicon oil, and one of its effect is used for transmitting P1 and P2's pressure, and its two keep apart the water injection, avoid parts such as spring and piston to rust the scale deposit.

Description

Novel constant-current blanking plug

Technical Field

The utility model relates to a used blanking plug of eccentric injection mandrel in oil field, especially a novel constant current blanking plug.

Background

The Daqing oil field is a heterogeneous multi-reservoir sandstone reservoir, and the transverse contradiction and the longitudinal contradiction of the oil field are prominent. The water injection well adopts a layered injection process to effectively relieve the contradiction between the plane and the interlayer, and a better development effect is achieved. The water distribution tool used in Daqing oil field at present is 665 series eccentric water distributor, and the plug matched with the eccentric water distributor is mainly divided into three types: the first is the conventional eccentric blanking plug; secondly, an electric adjustable blanking plug; and thirdly, an eccentric constant-current blanking plug.

Compared with other fixed water nozzle blanking plugs, the eccentric constant-flow water distribution blanking plug has the advantages that the water injection quantity does not change along with the change of injection pressure or formation pressure during working, one-stage or multi-stage water nozzles are replaced during water quantity allocation, and the water quantity of other layers is not changed. The workload of adjusting the water nozzles and testing is greatly reduced, and the better effects of improving the testing and adjusting efficiency by more than 1.5 times and improving the water injection qualification rate by more than 10 percent are seen.

When the constant-flow blanking plug is applied on site, parts such as a water outlet hole of the cylinder body, a plunger, a pre-pressing spring and the like are damaged after the constant-flow blanking plug works underground for 18 months, and the constant-flow effect is lost when the parts are serious. A novel constant-flow blanking plug is provided for improving the service life of the plug in the well.

Disclosure of Invention

For solving the problem that exists among the background art, the utility model provides a novel constant current blanking plug, this novel constant current blanking plug simple structure, convenient to use is difficult for the card stifled, long service life.

The utility model discloses a realize through following technical scheme: a novel constant flow blanking plug comprises a shell, an upper balance capsule, a flow-limiting water nozzle and a lower balance capsule, a fishing rod is arranged in the shell, pressure caps are arranged at the left end and the right end of the fishing rod, a positioning concave wheel is arranged at the lower end of each pressure cap, the lower end of the positioning concave wheel is provided with an upper balance capsule, the lower end of the upper balance capsule is provided with a spring, the lower end of the spring is provided with a piston, the lower end of the piston is provided with a lower balance capsule, the lower end of the lower balance capsule is provided with a current-limiting plug, the lower end of the current-limiting plug is provided with a current-limiting water nozzle, the shell is provided with an outlet, the lower end inside the shell is fixedly connected with a flow-limiting water nozzle, the flow-limiting water nozzle is connected with the lower balance capsule through a flow-limiting plug, the interior of the lower balance capsule is connected with a spring through a piston, the spring is connected with a positioning concave wheel through an upper balance capsule, and the positioning concave wheel is connected with a pressure cap through a fishing rod.

Preferably, the water injection is isolated by using an upper balancing capsule and a lower balancing capsule.

Preferably, the pressure at the lower end of the flow-limiting water nozzle is P1, the pressure at the outlet is P2, and the pressure at the upper end of the upper balance capsule is the same as the pressure P1.

Has the advantages that: the utility model discloses simple structure, convenient to use constitutes two airtight independent hydraulic pressure chambeies by last balanced capsule, spring, piston, lower balanced capsule, current-limiting end cap and shell, and inside is full of silicon oil, and one of its effect is used for transmitting P1 and P2's pressure, and its two keep apart the water injection, avoid parts such as spring and piston to rust the scale deposit, and the influence plays the activity and hinders pressure transmission.

Drawings

Fig. 1 is the overall structure schematic diagram of the novel constant-current blanking plug of the utility model.

Wherein, 1-shell, 2-upper balance capsule, 3-lower balance capsule, 4-fishing rod, 5-pressing cap. 6-positioning concave wheel, 7-spring, 8-piston, 9-flow-limiting plug, 10-flow-limiting water nozzle and 11-outlet.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in figure 1 of the drawings, in which,

a novel constant-current blanking plug comprises a shell 1, an upper balance capsule 2, a current-limiting water nozzle 10 and a lower balance capsule 3, wherein a fishing rod 4 is arranged at the upper end inside the shell 1, pressing caps 5 are arranged at the left and right ends of the fishing rod 4, a positioning concave wheel 6 is arranged at the lower end of the pressing cap 5, the upper balance capsule 3 is arranged at the lower end of the positioning concave wheel 6, a spring 7 is arranged at the lower end of the upper balance capsule 2, a piston 8 is arranged at the lower end of the spring 7, the lower end of the piston 8 is provided with the lower balance capsule 3, a current-limiting plug 9 is arranged at the lower end of the lower balance capsule 3, the lower end of the current-limiting plug 9 is provided with the current-limiting water nozzle 10, an outlet 11 is arranged on the shell 1, the lower end inside the shell 1 is fixedly connected with the current-limiting water nozzle 10, the current, the spring 7 is connected with the positioning concave wheel 6 through the upper balance capsule 2, and the positioning concave wheel 6 is connected with the pressing cap 5 through the fishing rod 4.

Adopt upper balance capsule 2 and balance capsule 3 down to keep apart the water injection, avoid parts such as spring and piston to rust the scale deposit, influence the activity and hinder pressure transmission.

The pressure P1 is arranged at the lower end of the flow-limiting water nozzle 10, the pressure at the outlet is P2, and the pressure at the upper end of the upper balance capsule 2 is the same as the pressure P1.

The working principle is as follows: 1. the upper balance capsule 2, the flow-limiting water nozzle 10 and the lower balance capsule 3 form two closed independent hydraulic cavities by the shell 1, the insides of the two closed independent hydraulic cavities are filled with silicon oil, one of the functions is used for transmitting the pressure of P1 and P2, and the other function is used for isolating water injection, so that the parts such as the spring 7, the piston 8 and the like are prevented from rusting and scaling, and the influence on movement and the obstruction on pressure transmission is avoided.

2. The water flow direction is from the water nozzle 10 entering of restriction, through the restriction choke plug 9 restriction flow through export 11 entering stratum. The pressure drop is P2.

3. When the formation pressure P2 is larger, P1-P2 is reduced, the downward thrust of the piston 8 is reduced, the gap at the lower end of the flow-limiting plug 9 is increased, and the water inlet amount is large.

When the formation pressure P2 is smaller, P1-P2 is increased, the pushing force under the piston 8 is increased, the gap at the lower end of the flow-limiting plug 9 is reduced, and the water inlet amount is small. Constant current in a certain range is realized.

Claims

1. The utility model provides a novel constant current blanking plug, includes the shell, goes up balanced capsule, current-limiting water injection well choke, lower balanced capsule, its characterized in that: the utility model discloses a capsule balance device, including shell, fishing rod, piston, pressure cap, flow limiting end cap, spring, pressure cap, spring, pressure cap lower extreme, the inside upper end of shell is equipped with fishing rod, both ends are equipped with the pressure cap about fishing rod, the pressure cap lower extreme is equipped with the location concave wheel, location concave wheel lower extreme is equipped with balanced capsule, it is equipped with the balanced capsule to go up balanced capsule lower extreme, it is equipped with the spring to go up balanced capsule lower extreme, the spring lower extreme is equipped with the current-limiting end cap, the current-limiting end cap lower extreme is equipped with the current-limiting water injection well choke, the export has been seted up on the shell, the inside lower extreme fixed connection current-limiting water injection well choke of shell, the current-limiting water injection well choke is connected with balanced.

2. The novel constant-flow blanking plug of claim 1, wherein: the water injection is isolated by adopting an upper balance capsule and a lower balance capsule.

3. The novel constant-flow blanking plug of claim 1, wherein: the pressure P1 is at the lower end of the flow-limiting water nozzle, the pressure at the outlet is P2, and the pressure at the upper end of the upper balance capsule is the same as the pressure P1.