CN207161042U - A hydrolyzed bridge plug - Google Patents

Abstract

The utility model discloses a bridge plug hydrolysises, include: the central cylinder, the rubber cylinder, the single slip and the cone are sleeved on the outer wall of the central cylinder; the pressure-building ball is accommodated in the diameter-changing cavity of the central cylinder; the first locking ring is sleeved on the left side of the rubber cylinder outside the central cylinder, a gap is reserved between the inner side of the left part of the first locking ring and the central pipe, and the inner side of the first locking ring is provided with a sawtooth structure; the second locking ring is sleeved in a gap between the central cylinder and the first locking ring, and the inner wall and the outer wall of the second locking ring are both provided with sawtooth structures; the cone is fixed outside the central cylinder on the right side of the rubber cylinder through a first shearing pin, and the section of the bottom of the cone is conical and is inserted into a gap between the central pipe and the slips. The utility model can realize express installation, and has simple operation and high efficiency; meanwhile, the bridge plug structure is made of special magnesium-based alloy, so that the bridge plug is automatically degraded without later drilling and grinding.

Description

A hydrolyzed bridge plug

technical field

The utility model relates to the downhole operation technology of petroleum engineering, in particular to a bridge plug setting assembly.

Background technique

In the technical field of layered fracturing for oil production in oilfields, bridge plugs are used in the sealing of oil and gas wells. It is transported to the predetermined position of the wellbore by cables or pipe strings, and the thrust is generated by gunpowder explosion, mechanical setting tools or hydraulic pressure to act on the upper joint, and the pulling force is applied to the tension rod, and the rubber cylinder is pressed up and down to expand and seal, and the tension is at the same time Increase, the tension rod breaks, the setting tool is separated from the bridge plug, the locking device works, the slips are embedded in the inner wall, the rubber tube expands and seals, and the setting is completed.

The one-way double-slip structure bridge plug or large-diameter bridge plug based on composite materials is commonly used now. After repeated setting, perforation and fracturing, all the bridge plug drills in the wellbore need to be drilled off at one time , to realize the diameter of the wellbore. It has good sealing performance, high pressure difference resistance, and large bearing capacity, but it is easy to set in the middle, and the setting structure is complicated. At the same time, the later salvage increases the operation cost and construction risk, which will cause secondary pollution to the formation and prolong the operation. Therefore, it is particularly important to develop a bridge plug that does not require drilling and grinding, can be quickly set, is simple to operate, and saves time and high efficiency.

Utility model content

The purpose of this utility model is to overcome above-mentioned deficiency. Provides a quick-install hydrolytic bridge plug that is simple and efficient to operate.

The technical solution provided by the utility model is: a central cylinder with a hollow structure, the rubber cylinder, a single slip and a cone are sleeved on the outer wall of the central cylinder; the pressure holding ball is accommodated in the variable diameter cavity of the central cylinder; the first The locking ring is set on the left side of the rubber tube outside the central tube. There is a gap between the inner side of the left part and the central tube. On the left side of the tube, there is a gap between the inner side of the left part and the central tube, and a sawtooth structure is provided on the inner side; the second locking ring is sleeved in the gap between the central tube and the first locking ring, and the inner and outer walls Both are equipped with a sawtooth structure; the cone, which is fixed outside the center tube on the right side of the rubber tube through the first shear pin, has a tapered bottom section and is inserted into the gap between the center tube and the slips.

The guide shoe is fixedly connected to the bottom end of the central cylinder, and its upper part is wrapped on the outer wall of the central cylinder to contact the slips. The guide shoe is provided with a pumping ring, and the guide shoe can push the central cylinder The force is transmitted to the slips.

The back ring, which is fixed outside the central cylinder by the second shear pin, fits the first locking ring, and when the second shear pin is cut off, the back ring can be opposite to the center barrel slide.

The lower end of the push cylinder is sleeved on the upper end of the central cylinder, is in contact with the back ring, and can slide relative to the central cylinder under the action of external force.

The lower end of the feeding joint is fixed on the inner wall of the central cylinder through the first shear pin, and the upper end is connected with a tension rod.

The inner cavity of the central cylinder has a baffle extending toward the center of the inner diameter, which is located on the left side of the variable diameter cavity, and can block the pressure holding ball from sliding to the left end, so as to ensure that the pressure holding ball enters together with the central cylinder.

The outer surface of the slip is provided with uniformly distributed stress concentration grooves along the axial direction to ensure that the slip is evenly stressed, and the upper part of the slip is a hollow structure at the stress groove; the outer wall of the slip is provided with a uniform ring The groove can be matched with the annular protrusion on the inner wall of the casing.

The inner wall of the left part of the first locking ring is provided with a sawtooth thread structure, which is opposite to that of the outer wall of the second locking ring; the contact surface of the central cylinder and the first locking ring is provided with a It has a sawtooth thread structure, and is opposite to the thread direction of the inner wall of the second locking ring. The second locking ring is fixed to the first locking ring and the center cylinder to maintain the downward pressure load and prevent springback.

The rubber cartridge is made of degradable polymer material; the slips, cone, pressure holding ball, first and second locking rings are all magnesium-based alloy materials, which can be degraded under the action of groundwater at the bottom of the well without drilling and grinding salvage.

An O-ring is provided between the inner ring of the rubber tube and the central tube, and three protective rings are provided at the right end of the rubber tube to further ensure the sealing of the gap between the rubber tube and the central tube.

Beneficial effects described in the utility model

The utility model adopts a single slip and a second locking ring to set the seal, and the pressure ball is pre-installed, which can realize quick installation, simple operation and high efficiency; the bridge plug structure adopts a special magnesium-based alloy, and the rubber cylinder adopts polymer materials It can be degraded under the action of groundwater without drilling and grinding.

Description of drawings

Fig. 1 is a schematic diagram of a bridge plug of the present invention.

Fig. 2 is a schematic diagram of slips of the present invention.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it by referring to the description.

As shown in Figure 1, the bridge plug includes a hollow central cylinder 4 with a variable diameter cavity inside, which can accommodate the pressure holding ball 7; the outer wall of the central cylinder 4 is provided with a rubber sleeve 12 and a single slip 20, the rubber sleeve 12 The first locking ring 11 is sleeved on the left side, and there is a gap between the inner side of the left part and the central tube, and the inner side is provided with a sawtooth structure; the second locking ring 10 is sleeved between the central tube 12 and the first locking ring. In the gap between 11, sawtooth structures are provided on the inner and outer walls; the cone 18 is fixed on the outer wall of the central tube 4 on the right side of the rubber tube 12 through the first shear pin 19, and its bottom section is conical. Insert it into the gap between the central cylinder 4 and the slips 20.

The guide shoe 22 is fixedly connected to the bottom of the center tube 4, and its upper part is wrapped on the outer wall of the center tube 4 to contact the slips 20. The guide shoe 22 is provided with a pumping ring 21, and the guide shoe 22 can push the center tube The active force of 4 is transmitted to slip 20.

The back ring 9, which is fixed outside the central cylinder 4 through the second shear pin 8, fits with the first lock ring 11 and the lock ring 10. When the second shear pin 8 is cut off, the back ring 9 The ring 9 is slidable relative to the central cylinder 4 .

The push cylinder 3, whose lower end is sleeved on the upper end of the central cylinder 4, is in contact with the back ring 9, and can slide relative to the central cylinder under the action of external force.

Feed joint 2, its lower end is fixed on the inner wall of central cylinder 4 through the third shear pin 5, and its upper end is connected with tension rod.

The inner cavity of the central cylinder 4 has a baffle plate 6 extending toward the center of the inner diameter, which is located on the left side of the variable diameter cavity. The baffle plate 6 can block the pressure holding ball 7 from sliding to the left, ensuring that the pressure holding ball 7 enters together with the central cylinder 4.

As shown in Figure 2, the outer surface of a single slip 20 is provided with uniformly distributed stress concentration grooves along the axial direction to ensure that the slips are evenly stressed, and the upper part of the slip 20 is a hollow structure at the stress groove; A uniform annular groove is provided, which can match the annular protrusion on the inner wall of the casing, so that the slip 20 can be embedded in the inner wall of the casing after it is broken.

The inner wall of the left part of the first locking ring 11 is provided with a sawtooth thread structure, and the thread tooth direction of the outer wall of the second locking ring 10 is opposite; the contact surface of the central cylinder 4 with the first locking ring 11 is provided with a sawtooth thread structure, and is opposite to the thread tooth direction of the inner wall of the second locking ring 10 . During work, the stressed second locking ring 10 can only undergo one-way irreversible displacement relative to the central cylinder 4 or the first locking ring 11. When the thread structure is engaged, the second locking ring 10 and the first locking ring 11 and The central cylinder 4 is fixed to keep the downward pressure load and prevent rebound.

The rubber cartridge is made of degradable polymer material; the slips 20, the cone 18, the first locking ring 11, the guide shoe 22, the holding pressure ball 7, the back ring 9, and the second locking ring 10 are all magnesium-based alloy materials, It can be degraded under the action of groundwater at the bottom of the well without drilling, grinding and fishing.

An O-ring 13 is provided between the inner ring 14 of the rubber cylinder and the central cylinder 4, and three protective rings 15-17 are provided at the right end of the rubber cylinder 12 to further ensure the gap between the sealing rubber cylinder 12 and the central cylinder 4.

In this embodiment, during work, the cable or coiled tubing is used to deliver the bridge plug and the corresponding setting tool to the predetermined position in the wellbore, and the setting tool is blasted with gunpowder to generate pressure and tension, two forces, wherein the pressure acts on Push cylinder 3, another pulling force acts on tension bar 1. The pusher 3 puts pressure on the back ring 9, cuts the second shear pin 8, and the pusher 3 drives the back ring 9, the second locking ring 10, and the first locking ring 11 to go downward, and at the same time applies pressure to the top of the rubber tube 12. At the same time, another pulling force drives the upper joint 2, the central tube 4 and the guide shoe 22 to move upward through the tension rod 1, and the guide shoe 22 pushes the slip 20 to move upward, and the slip 20 squeezes the cone 18, and the first shear The pin 19 is cut off, the cone 18 slides relative to the central cylinder 4, and exerts pressure on the protective ring 12-14 under the rubber cylinder 12, causing the rubber cylinder 12 to expand, and at the same time, the above-mentioned components continue to squeeze the slips 20. As the pulling force reaches a certain value, Slips 20 are broken and embedded on the inner wall of the casing after the vertical force reaches the breaking value. The rubber cartridge 12 expands and seals the casing when subjected to up and down pressure. The threaded structures on the inner and outer walls of the second locking ring 10 respectively engage with the threaded structures on the outer wall of the central cylinder 12 and the inner wall of the first locking ring 11, and the central cylinder 12 of the first locking ring and the first locking ring 11 are completed. setting. When the gunpowder blasting force continues to increase, the force will cut off the first shear nail 5, and the upper joint 2 and the push tube 3 will be separated from the bridge plug, and they will be taken out from the well with the setting tool. When it is necessary to fracture the formation above the bridge plug, the fracture can be sealed without the need to drop the ball. After the construction is completed, the bridge plug components can be degraded under the action of groundwater, without the need for subsequent salvage drilling.

Although the embodiment of the present utility model has been disclosed as above, it is not limited to the use listed in the description and the implementation, and it can be applied to various fields suitable for the present utility model. For those familiar with the art, Further modifications can be readily effected, so the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (10)

1. A hydrolysis bridge plug, characterized in that, comprising: A central cylinder with a hollow structure, the rubber cylinder, a single slip and a cone are sleeved on the outer wall of the central cylinder; The pressure-suppressing ball is accommodated in the variable-diameter cavity of the central cylinder; The first locking ring is sleeved on the left side of the rubber tube outside the central tube, and there is a gap between the inner side of the left part and the central tube, and a sawtooth structure is arranged on the inner side; The second locking ring is sleeved in the gap between the central cylinder and the first locking ring, and its inner and outer walls are provided with sawtooth structures; The cone, which is fixed outside the central tube on the right side of the rubber tube through the first shear pin, has a conical bottom section and is inserted into the gap between the central tube and the slips. 2. The hydrolysis bridge plug according to claim 1, further comprising: The guide shoe is fixedly connected to the bottom end of the central cylinder, and its upper part is wrapped on the outer wall of the central cylinder to contact the slips, and the guide shoe is provided with a pumping ring. 3. The hydrolysis bridge plug according to claim 1, further comprising: The back ring is fixed on the outside of the central cylinder through the second shear pin, and is attached to the first locking ring. 4. The hydrolysis bridge plug according to claim 3, further comprising: The lower end of the push cylinder is sheathed on the upper end of the central cylinder and is in contact with the back ring. 5. The hydrolysis bridge plug according to claim 1, further comprising: The lower end of the feeding joint is fixed on the inner wall of the central cylinder through the third shear pin, and the upper end is connected with the tension rod. 6. The hydrolytic bridge plug of claim 1, further comprising: The inner cavity of the central cylinder has a baffle extending toward the center of the inner diameter to block the pressure holding ball. 7. The hydrolytic bridge plug of claim 1, further comprising: The outer surface of the slip is provided with uniformly distributed stress concentration grooves along the axial direction, and the upper part of the slip is a hollow structure at the stress groove; The outer wall of the slip is provided with a uniform annular groove, which can match the annular protrusion on the inner wall of the casing. 8. The hydrolysis bridge plug according to claim 1, further comprising: The inner wall of the left part of the first locking ring is provided with a sawtooth thread structure, which is opposite to the thread direction of the outer wall of the second locking ring; The contact surface of the central barrel and the first locking ring is provided with a sawtooth thread structure, which is opposite to that of the inner wall of the second locking ring. 9. The hydrolysis bridge plug according to claim 1, further comprising: The rubber cartridge is made of degradable polymer material; the slips, cone, pressure holding ball, first and second locking rings are all magnesium-based alloys. 10. The hydrolysis bridge plug according to claim 1, further comprising: An O-ring is provided between the inner ring of the rubber tube and the central tube, and a protective ring is provided at the right end of the rubber tube.