DOWNHOLE OCCLUDER, PRESSURIZED SUCKER ROD AND OPERATION TECHNIQUE TO REPAIR OIL PIPES

Abstract

This invention discloses a downhole occluder for oil wells. A sealing socket and a positioning flange with sealing surfaces are set up inside an oil pipe. An oil sucker rod pump is installed inside the tubular column which mounts on top of the sealing socket. A sealing surface of a sealing flange on the rod pump mounts with a sealing surface of the sealing socket on the tubular column. Outer oil inlet borings are placed at the wall of oil tubular column underneath the positioning flange. An inner pipe is installed inside this section of tubular column. Place inner oil inlet borings on the inner pipe wall corresponding to outer oil inlet borings on the tubular column. Sealing grooves are placed underneath the inner oil inlet borings on the inner pipe wall. Sealing rings are placed in the sealing grooves to seal the inner wall of tubular column. Top of inner pipe is connected to oil sucker rod pump through connecting coupler. Bottom end of tubular column is occluded. The structure of this invention is simple, reasonable and reliable to perform the well maintenance works of pressurized sucker rod and oil pipe. It brings the convenience to repeatedly occlude the pressure under the well to result in a safe, highly efficient, environmental and energy saving production.

Claims

1. A method for maintaining oil pipes using a downhole occluder, pressurized sucker rod, comprising: setting up a sealing socket and a positioning flange with sealing surfaces inside an oil tubular column; installing a sucker rod pump on top of the sealing socket inside the tubular column, wherein a sealing surface of a sealing flange on the sucker rod pump mounts with a sealing surface of the sealing socket of the tubular column, wherein outer oil inlet borings are placed on a wall of the tubular column underneath the positioning flange, and wherein an inner pipe is installed in the tubular column underneath the positioning flange; on a wall of the inner pipe, setting up inner oil inlet borings that correspond to the outer oil inlet borings on the tubular column; setting up sealing grooves underneath the inner oil inlet borings on the wall of the inner pipe; installing sealing rings to the sealing grooves that seal an inside wall of the tubular column, wherein the top of inner pipe is connected to the sucker rod pump through a connecting coupler, and a bottom end of tubular column is occluded.

2. The method of claim 1, wherein the inner pipe defines 1 to 5 sealing grooves.

3. The method of claim 1, wherein at least one sealing ring is a flexible wear resistant ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] This invention is described below with drawings.

[0019] FIG. 1 is a schematic of present invention in sealed position.

[0020] FIG. 2 is a schematic of present invention in opened position.

DETAILED DESCRIPTION

[0021] A downhole occluder, pressurized oil sucker rod and maintenance techniques for oil pipe are shown in FIGS. 1 and 2. Set up the sealing socket 7 and positioning flange 8 with sealing surfaces inside tubular column 2. Install sucker rod pump 9 inside tubular column 2, which mounts on top of sealing socket 7. The sealing surface of sealing flange 6 on the sucker rod pump 9 mounts with the sealing surface of sealing socket 7 of tubular column 2. Outer oil inlet borings 3 are placed on the wall of tubular column underneath positioning flange 8. Inner pipe 1 is installed in this section of tubular column. On the inner pipe 1 wall, set up the inner oil inlet borings 4 that are corresponding to outer oil inlet borings 3 on tubular column 2. Set up sealing grooves underneath the inner oil inlet borings 4 on the inner pipe 1 wall. Install sealing rings 5 to the sealing grooves that seal the inside wall of tubular column 2. The top of inner pipe 1 is connected to sucker rod pump 9 through connecting coupler 10. The bottom end of tubular column 2 is occluded. There are 1 to 5 sealing grooves. Sealing ring 5 is a flexible wear resistant sealing ring.

[0022] Installation procedure of tubular column and sucker rod string

[0023] 1. Occlude the bottom of oil pipe with a plug. Connect top of inner pipe to the bottom of connecting coupler. Install inner pipe and sealing rings inside tubular column at sealed position. The bottom of pipe is now in sealed position. Maintenance work to the oil sucker rod can be carried out without pressurizing the well.

[0024] 2. Place positioning flange, sealing surface and top connecting tubular column in place by sequence until the tubular column is installed.

[0025] 3. Connect bottom of sucker rod pump to the top of connecting coupler. Install top of connecting coupler, sucker rod pump and sucker rod string in sequence.

[0026] 4. When top of connecting coupler mounts with bottom section, continue to lower the sucker rod string until the sealing surface 1 of sucker rod pump touches the sealing surface 2 of tubular column. Sealing surface 2 restricts the position of sucker rod pump to keep both top and bottom sides of sucker rod string and oil pipe sealed. At the same time, inner pipe and sealing rings are pushed by sucker rod pump down to opened position.

[0027] 5. Adjust the buffer setting to complete the installation of sucker rod string. Pumping process may start.

[0028] Above mentioned working process of sucker rod string is opposite to tubular column. When top of connecting coupler separates from the bottom section, inner pipe is lifted up to sealed position. Under such circumstance, bottom of the oil pipe is occluded. The maintenance work of sucker rod string can be carried out without pressurizing the well.