Tool for jet packing and fracturing and tubular column comprising same

Patent metadata

Field	Value
Publication number	US-11142989-B2
Application number	US-201716071125-A
Country	US
Kind code	B2
Filing date	Jan 13, 2017
Priority date	Jan 20, 2016
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A tool for perforating, packing and fracturing and a tubing string comprising the tool are disclosed. The tool comprises an upper connector, a connection sleeve, a mandrel, a packer, a lower connector, and an inner sleeve. The upper connector is provided with communication holes, and a nozzle is provided at each communication hole. The inner sleeve is provided on an inner wall of the upper connector to block the nozzle. Under an action of a fracturing fluid, the inner sleeve moves downwards to expose the nozzle, and the packer is packed. Then, perforating is performed through the nozzle. After perforating is finished, the nozzle is configured to be lost at a communication hole, and then fracturing is performed. When the tool is used, operation cost can be reduced, and reservoir stimulation effect can be improved.

First claim

The invention claimed is:

1. A tool for perforating, packing and fracturing, comprising:
an upper connector, which is provided with communication holes for communicating inside and outside, a nozzle being provided at each communication hole;
a connection sleeve, which is provided at a lower end of the upper connector;
a mandrel, which is provided at a lower end of the connection sleeve;
a packer, which is provided on an outer wall of the connection sleeve and an outer wall of the mandrel, the packer comprising a rubber barrel assembly and a first pressure transmission hole which is provided in the connection sleeve;
a lower connector, which is provided at a lower end of the mandrel; and
an inner sleeve, which is provided in an internal flowbore of the upper connector and is slidingly connected to the upper connector, in an initial state, the inner sleeve blocking the nozzles and the first pressure transmission hole,
wherein after an internal flowbore of the inner sleeve is blocked, the inner sleeve is configured to be movable relative to the upper connector to expose the nozzle under an action of a first pressure,
at the same time, the first pressure transmission hole is in communication with the internal flowbore of the inner sleeve so that the rubber barrel assembly deforms under an action of pressure and the packer is packed,
before a fracturing fluid is pumped into the inner sleeve, the nozzle is configured to be detached from at least one of the communication holes.

2. The tool according to claim 1 , wherein a cross-sectional area of at least one of the communication holes decreases in a direction from inside to outside, and a shape of the nozzle matches at least one of the communication holes.

3. The tool according to claim 1 , wherein the packer further comprises:
an outer housing, with an upper end thereof being sleeve-connected in a fixed manner to the outer wall of the connection sleeve and a lower end thereof extending over the mandrel;
a piston cylinder, which is formed by an upper end surface of the mandrel, an inner wall of the outer housing, and the connection sleeve; and
a piston, with an upper end thereof being provided in the piston cylinder and a lower end thereof extending downwards between the mandrel and the outer housing and abutting against the rubber barrel assembly, the piston being connected to the outer housing in a sliding manner,
wherein the first pressure transmission hole is provided in the connection sleeve and is in communication with the piston cylinder,
after the inner sleeve moves relative to the upper connector and enables the fracturing fluid to enter into the first pressure transmission hole, the fracturing fluid enters into the piston cylinder and pushes the piston to move downwards.

4. The tool according to claim 3 , wherein a first ratchet is provided on the outer wall of the mandrel, and a second ratchet is provided on an inner wall of the piston to cooperate with the first ratchet.

5. The tool according to claim 3 , wherein the inner sleeve is provided with a second pressure transmission hole in a wall thereof, and the second pressure transmission hole is configured to be in communication with the first pressure transmission hole after the inner sleeve moves downwards.

6. The tool according to claim 5 , wherein a first ball seat is provided on an inner wall of the inner sleeve,
when a first ball is dropped into the inner sleeve, the first ball seat is configured to cooperate with the first ball so as to close the inner sleeve, and
the first ball seat is at a lower end of the second pressure transmission hole.

7. The tool according to claim 5 , wherein the first pressure transmission hole comprises a first part used for communicating with the second pressure transmission hole and a second part communicating with the first part and the piston cylinder; and
wherein the first part is configured as a hole extending along a radial direction, and the second part is configured as a hole extending along an axial direction.

8. The tool according to claim 7 , wherein a reaming is provided at an inlet of the first part.

9. The tool according to claim 5 , further comprising an opener used for blocking the internal flowbore of the inner sleeve, the opener comprising:
an opener main body;
resilient pieces extending upwards from the opener main body;
a ball seat provided at a lower end of the opener main body; and
a ball cooperating with the ball seat,
wherein the resilient pieces are provided with a protrusion to cooperate with grooves provided on an inner wall of the inner sleeve.

10. The tool according to claim 9 , wherein a retaining ring is provided below the grooves of the inner sleeve and is configured to be slidable in an axial direction relative to the inner sleeve, and a sealing element is provided between an upper end surface of the retaining ring and the inner sleeve so that the retaining ring compresses the sealing element during a process when the retaining ring moves upwards relative to the inner sleeve.

11. The tool according to claim 9 , wherein an elastic booster ring is provided between the opener main body and the ball seat.

12. A tubing string, comprising the tool according to claim 1 .

Assignees

• China Petroleum & Chem Corp
• Sinopec Southwest Oil & Gas Co

Inventors

• Gan Zhenwei
• Qi Bin
• Hu Shunqu
• Hou Zhimin
• Lin Yongmao
• Zhou Yijun
• Wang Lei
• Liu Tao
• Teng Wenjiang
• Cui Jingyu

Classifications

• E21B33/1285 Primary

  by fluid pressure · CPC title

• E21B43/26

  by forming crevices or fractures · CPC title

• E21B34/142

  unsupported or free-falling elements, e.g. balls, plugs, darts or pistons · CPC title

• E21B2200/06

  Sleeve valves · CPC title

• E21B43/114 Primary

  Perforators using direct fluid action {on the wall to be perforated}, e.g. abrasive jets · CPC title