CN201581882U - Steam Injection Packing Device for Heavy Oil Thermal Recovery Well - Google Patents

Abstract

The utility model relates to a steam injection packoff device for a thick oil thermal production well, which has the advantages of having simple structure and convenient use, being capable of shortening the auxiliary working time before oil extraction, improving the working efficiency, being heat-resistant and corrosion-resistant, having stable working state and the like; and the steam injection packoff device has the structure that the packoff device comprises a central pipe device; the upper end of the central pipe device is connected with a thrust device; and a graphite sealing device is arranged at the connection part of the central pipe device and the thrust device.

Description

Steam Injection Packing Device for Heavy Oil Thermal Recovery Well

technical field

The utility model relates to a steam injection sealing device for heavy oil thermal recovery wells.

Background technique

Heavy oil (also known as heavy oil) is an important part of petroleum hydrocarbon energy, and has a huge potential several times higher than conventional crude oil resources. For heavy oil and ultra-heavy oil wells, the formation pressure is low, the fluidity is poor, the heavy oil has high viscosity and high density, not only low displacement efficiency, but also low volume sweeping efficiency, which will cause insufficient wellbore fluid supply, difficult pumping, single well Due to the sharp drop in output and other issues, thermal recovery technology is currently used for heavy oil collection. The steam injection isolation device used in the thermal recovery device is easily corroded and worn after long-term use, which affects the recovery of heavy oil. .

Contents of the invention

The purpose of this utility model is to solve the above problems, to provide a heavy oil thermal recovery well steam injection sealing device which has the advantages of simple structure, convenient use, and can effectively prolong the service life of thermal recovery equipment.

In order to achieve the above object, the utility model adopts the following technical solutions:

A steam injection packer for heavy oil thermal recovery wells, which includes a central pipe device, the upper end of which is connected to a thrust device, and a graphite sealing device is arranged at the connection between the two.

The graphite sealing device is a flexible graphite cylinder with a spring wrapped in its inner wall.

The central tube device includes an upper central tube and a central tube, which are connected by an upper cone II; the upper end of the upper central tube is connected with a thrust device through an upper cone I and a valve sleeve; the thrust device includes a push rod, and the push rod The upper end of the upper joint is fitted with the upper joint; the lower end of the upper joint is connected with the force transmission sleeve, and a sealing sleeve is provided at the joint between the two; the force transmission sleeve is connected with the jacket through the disconnecting body, and the jacket is connected with the connecting cylinder, and the connecting cylinder is connected with the cylinder shell. There is an upper slip on the casing; the push rod is connected to the upper center pipe through the valve sleeve and the upper cone I; the end of the casing is connected to the graphite sealing device, and the graphite sealing device is connected to the pressure seat of the upper center pipe; the pressure seat is set on Outside the upper central tube; the upper cone II is connected to the connecting body, and the connecting body is connected to the upper seat; the upper seat is installed on the outer central tube outside the central tube, and the outer central tube is equipped with a heat-resistant rubber tube, which is connected to the lower seat The lower seat is connected with the lower cone; the slope surface of the lower cone is in contact with the lower slips, and the lower slips are connected with the centralizing block. On the opposite side of the central central tube, a centralizing body, a fixed block and a sliding sleeve; the lower end of the central pipe is fitted with a connecting sleeve, the connecting sleeve is equipped with a fixed sleeve, and the end of the central pipe is connected with the check valve.

The utility model adopts a high-temperature-resistant and corrosion-resistant graphite cylinder. The center of the graphite cylinder is a high-strength spring, and the spring is surrounded by graphite. When joints, power transmission sleeves, jackets, connecting cylinders, upper cones, and cylinder shells act on the graphite cylinder, the radial expansion of the graphite cylinder will play a role in sealing the tube.

When in use, the device is lowered to the designed position, and a support point is established on the inner wall of the casing to realize setting. At the same time, the quality of the pipe string is pressed on the seal, so that the diameter of the seal becomes larger to achieve setting. At the same time, the clamping The tile enters the working state, so that the seal cannot be returned, and the purpose of sealing the isolation sleeve is achieved. After steam injection, the single-flow device is opened to allow the crude oil to flow to the top of the process string, and it can be directly operated without killing the well.

The beneficial effects of the utility model are: simple structure, convenient use, can shorten the auxiliary working time before oil extraction, improve work efficiency, high temperature resistance, corrosion resistance, stable working state and the like. A single-flow device is added to the process string, and the operation can be started directly after the steam injection is completed, which reduces the well occupation time by 5 to 7 days, and improves the well operation rate; during operation, no brine is used to kill the well, and no cold damage is caused to the formation, and the well is close to the well. The oil and gas channels in the zone are unblocked, the production of thermal recovery wells is increased, and the cost per ton of oil is reduced; the normal steam injection pressure is maintained without affecting the steam injection effect.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the structure of the flexible graphite cylinder.

Among them, 1, upper joint 2, force transmission sleeve 3, outer jacket 4, connecting cylinder 5, upper cone I 6, cylinder shell 7, pressure seat 8, upper cone II 9, center pipe 10, upper seat 11, outer center pipe 12. Fixed pin 13, pin 14, lower slip 15, righting block 16, fixed sleeve 17, check valve 18, connecting sleeve 19, sliding sleeve 20, fixed block 21, centralizing body 22, lower cone 23, lower seat 24. Temperature-resistant rubber tube 25, connecting body 26, upper central tube 27, flexible graphite tube 28, upper slips 29, valve sleeve 30, push rod 31, disconnecting body 32, sealing sleeve 33, spring.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

In Fig. 1, the steam injection packer for heavy oil thermal recovery wells includes a central pipe device, the upper end of which is connected to the thrust device, and a graphite sealing device is provided at the connection between the two.

The graphite sealing device is a flexible graphite cylinder 27 with a spring 33 wrapped in its inner wall, as shown in FIG. 2 .

The central tube device includes an upper central tube 26 and a central tube 9, which are connected by an upper cone II8; the upper end of the upper central tube 26 is connected with a thrust device through an upper cone I5 and a valve sleeve 29; the thrust device includes a push rod 30 , the top end of the push rod 30 is fitted with the upper joint 1; the lower end of the upper joint 1 is connected with the force transmission sleeve 2, and a sealing sleeve 32 is arranged at the junction of the two; The connecting cylinder 4 is connected, and the connecting cylinder 4 is connected with the shell 6, and the upper slip 28 is arranged on the shell 6; the push rod 30 is connected with the upper central pipe 26 through the valve sleeve 29 and the upper cone 15; the end of the shell 6 is connected with the The flexible graphite cylinder 27 is connected, and the flexible graphite cylinder 27 is connected with the press seat 7 of the upper central tube 26; the press seat 7 is set outside the upper central tube 26; the upper cone II8 is connected with the connecting body 25, and the connecting body 25 is connected with the upper seat 10 The upper seat 10 is installed on the outer central tube 11 outside the central tube 9, the outer central tube 11 is equipped with a heat-resistant rubber tube 24, the temperature-resistant rubber tube 24 is connected with the lower seat 23, and the lower seat 23 is connected to the outer central tube through the fixing pin 12 11, while the lower seat 23 is also connected with the lower cone 22 through the pin 13; the slope of the lower cone 22 is in contact with the lower slip 14, and the lower slip 14 is connected with the centralizing block 15, and is connected with the centralizing block on the outer central tube 11. 15 opposite sides are also provided with centralizer 21, fixed block 20 and sliding sleeve 19 successively;

Claims (3)

1. A steam injection packer for heavy oil thermal recovery wells is characterized in that it comprises a central pipe device, the central pipe device upper end is connected with a thrust device, and a graphite sealing device is provided at both joints. 2 . The steam injection packer for heavy oil thermal recovery wells according to claim 1 , wherein the graphite sealing device is a flexible graphite tube with a spring wrapped in its inner wall. 3 . 3. The steam injection packer for heavy oil thermal recovery wells as claimed in claim 1, wherein the center pipe device comprises an upper center pipe and a center pipe, and the two are connected by an upper cone II; the upper center pipe The upper end is connected with the thrust device through the upper cone I and the valve sleeve; the thrust device includes a push rod, and the top end of the push rod is fitted with an upper joint; The force sleeve is connected with the jacket through the disconnecting body, and the jacket is connected with the connecting cylinder, and the connecting cylinder is connected with the cylinder shell, and the upper slip is arranged on the cylinder shell; the push rod is connected with the upper center pipe through the valve sleeve and the upper cone I; the cylinder The end of the shell is connected with the graphite sealing device, and the graphite sealing device is connected with the pressure seat of the upper central tube; the pressure seat is set outside the upper central tube; the upper cone II is connected with the connecting body, and the connecting body is connected with the upper seat; the upper seat is installed on the central tube On the outer central tube, the outer central tube is fitted with a heat-resistant rubber tube, which is connected to the lower seat, which is connected to the lower cone; the slope surface of the lower cone is in contact with the lower slip, and the lower slip is in contact with the lower cone. The centralizing block is connected, and on the opposite side of the centralizing block, a centralizing body, a fixed block and a sliding sleeve are sequentially arranged; the lower end of the central pipe is fitted with a connecting sleeve, and a fixed sleeve is installed on the connecting sleeve, and the end of the central pipe is connected with a check valve.

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