CN113530508A

CN113530508A - Time-delay sliding sleeve

Info

Publication number: CN113530508A
Application number: CN202010293752.7A
Authority: CN
Inventors: 张卫平; 钱杰; 沈泽俊; 张国文; 童征; 廖成龙
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2021-10-22
Anticipated expiration: 2040-04-15
Also published as: CN113530508B

Abstract

The invention discloses a time-delay sliding sleeve, which comprises: the upper joint, the central pipe, the lower joint, the upper shell, the lower shell, the sliding sleeve, the rupture disk and the time delay mechanism are sequentially connected from top to bottom. The upper shell is sleeved on the upper joint and forms a first annular space with the central pipe, the upper shell and the central pipe are provided with corresponding first overflowing holes, and the first overflowing holes are communicated with the inside of the central pipe. The upper end of the lower shell is connected with the lower end of the upper shell and has a preset distance with the central pipe, the lower end of the lower shell is sleeved on the lower joint and has a preset gap with the lower joint, and a second annular space is formed between the middle of the lower shell and the central pipe. The time delay mechanism is plugged in the second annular space and used for communicating the preset gap with the first annular space according to preset time delay time after being triggered by pressure. The method can meet the construction requirement of establishing the first-stage fracturing channel, has short period and low cost, and can flexibly configure the pressure test time of the sleeve.

Description

Time-delay sliding sleeve

Technical Field

The invention relates to the field of petroleum instruments, in particular to a time-delay sliding sleeve.

Background

In unconventional reservoir development, staged fracturing operations are typically performed to improve the flow environment of oil in the subsurface and increase well production. Before fracturing operation, it is very important to establish a first section of fracturing channel in an oil and gas well.

Prior to performing a fracturing operation, a first section of a fracturing channel is established in a hydrocarbon well by perforating a fracturing string through a coiled tubing or conventionally actuating a sliding sleeve.

The inventor finds that the prior art has at least the following problems:

if fracturing operation needs to be carried out in a deeper horizontal well, the first section of fracturing channel is established in the oil and gas well through perforation of the coiled tubing on the fracturing tubing string, so that the period is long, and the cost is high.

Disclosure of Invention

The embodiment of the invention provides a time-delay sliding sleeve, which not only meets the construction requirement of establishing a first section of fracturing channel, has short period and low cost, but also can flexibly configure the pressure test time of a casing, and comprises:

the upper joint, the central pipe and the lower joint are sequentially connected from top to bottom;

the upper shell is sleeved on the upper joint, a first annular space is formed between the upper shell and the central pipe, corresponding first overflowing holes are formed in the upper shell and the central pipe, and the first overflowing holes are communicated with the inside of the central pipe;

the upper end of the lower shell is connected with the lower end of the upper shell, a preset distance is reserved between the upper shell and the central pipe, the lower end of the lower shell is sleeved on the lower joint, a preset gap is reserved between the lower shell and the lower joint, and a second annular space is formed between the middle of the lower shell and the central pipe;

the sliding sleeve is arranged at the first overflowing hole in the first annular space and used for sliding in the first annular space under the pushing of pressure so that the upper shell is communicated with the two first overflowing holes in the central pipe;

the rupture disk is arranged on the side wall of the lower joint and is used for rupturing under preset pressure, so that the interior of the central pipe is communicated with the preset gap and the second annular space;

and the time delay mechanism is blocked in the second annular space and used for communicating the central pipe with the second annular space at the upper part of the time delay mechanism according to preset time delay time after being triggered by pressure.

Optionally, the sliding sleeve is fixed in the first annular space by a first shear pin.

Optionally, the time-delay sliding sleeve further comprises: a pressure cap provided with a liquid passing hole;

a through hole is formed in the side wall of the lower joint;

the rupture disk and the pressure cap are arranged in the through hole from inside to outside.

Optionally, the time-delay sliding sleeve further comprises: and the annular body structure is fixed in the second annular space at the lower part of the time delay mechanism through a second shear pin.

Optionally, the time delay mechanism includes: the device comprises a sleeve, an electric push rod, a pin body and a top plate;

a second overflowing hole is formed in the central pipe and the sleeve, communicated with the inside of the central pipe and corresponding to the position of the pin body;

the pin body and the electric push rod are arranged in the sleeve from top to bottom;

the top plate is arranged at the top end of the sleeve and abuts against the pin body;

the electric push rod is used for pushing the pin body upwards to knock the top plate according to preset delay time.

Optionally, the electric putter includes: the device comprises a shell, a battery, a circuit board, an execution element, a mandril and a trigger switch, wherein the battery, the circuit board, the execution element and the mandril are arranged in the shell;

the battery, the circuit board, the executive component and the trigger switch are electrically connected in sequence;

the circuit board is used for controlling the execution element to work according to preset delay time;

the actuating element is used for pushing the ejector rod to extend upwards from the shell.

Optionally, the first annular space on the upper part of the sliding sleeve is a vacuum cavity.

Optionally, the upper joint, the central pipe and the lower joint are sequentially in threaded connection.

Optionally, the upper housing is in threaded connection with the lower housing.

Optionally, a sealing ring is arranged between the upper joint and the central pipe.

In the embodiment of the invention, the upper joint and the lower joint are arranged, so that the connection with the technical casing is realized, and the device is convenient to go into a well. Through setting up the center tube, go up casing and sliding sleeve, and make and go up the casing suit on last joint, be formed with first annular space with the center tube, and go up the casing and be provided with corresponding first overflowing hole with the center tube, this first overflowing hole communicates with the inside of center tube, simultaneously with the first overflowing hole department of sliding sleeve setting in first annular space, guaranteed that the sliding sleeve can slide in first annular space under the promotion of pressure, and then make two first overflowing holes intercommunication on casing and the center tube, so as to carry out follow-up fracturing operation. Through setting up rupture disk to make it break under predetermineeing pressure, the inside of center tube when having realized the operation with predetermineeing clearance, the intercommunication of second annular space. Through setting up delay mechanism to make delay mechanism shutoff in the second annular space, receive pressure after triggering according to predetermineeing the delay time, with the second annular space intercommunication on center tube and the delay mechanism upper portion, the first discharge orifice of can accurate control and the inside intercommunication time of center tube, realized the purpose of carrying out the sleeve pipe pressure testing before opening the fracturing passageway. In conclusion, the method can meet the construction requirement of establishing the first-stage fracturing channel, has short period and low cost, and can flexibly configure the pressure test time of the casing.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:

FIG. 1 is a schematic structural view of a delay sliding sleeve according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an electric putter according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a delay mechanism in an embodiment of the present invention.

The reference numbers are as follows:

1, an upper joint is arranged on the upper part,

2, a central tube is arranged in the middle of the tube,

3 a lower joint is arranged at the lower part of the pipe,

4, the upper part of the shell is provided with a shell,

5, a lower shell is arranged on the lower shell,

6 a sliding sleeve is arranged on the upper surface of the sliding sleeve,

7 a rupture disk is arranged on the outer wall of the container,

8, a time-delay mechanism is arranged,

a sleeve is arranged in the sleeve 801,

802 an electric push rod is driven by a motor,

8021 the outer shell of the container is,

8022 a battery pack comprising a plurality of cells,

8023 the circuit board is provided with a plurality of printed circuit boards,

8024 the elements of the actuator are arranged such that,

8025 the push rod of the push rod,

8026 the trigger switch is turned on or off,

803 the body of the pin-shaped body,

804 a top plate is provided and,

9 a first shear pin is inserted into the first shear pin,

10, pressing the cap, wherein the cap is pressed,

1001 through-hole of the liquid to be filtered,

11, the structure of a ring body is as follows,

12 of the second shear pin, a second shear pin,

x is a first overflowing hole which is provided with a first overflowing hole,

y a first annular space is arranged in the first annular space,

the second annular space of Z is,

and V, a second overflowing hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

In the description of the present specification, the terms "comprising," "including," "having," "containing," and the like are used in an open-ended fashion, i.e., to mean including, but not limited to. Reference to the description of the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The sequence of steps involved in the embodiments is for illustrative purposes to illustrate the implementation of the present application, and the sequence of steps is not limited and can be adjusted as needed.

The embodiment of the invention provides a time-delay sliding sleeve, as shown in the attached figure 1, the time-delay sliding sleeve comprises: the explosion-proof device comprises an upper joint 1, a central pipe 2, a lower joint 3, an upper shell 4, a lower shell 5, a sliding sleeve 6, a rupture disk 7 and a time delay mechanism 8 which are sequentially connected from top to bottom. Wherein, the upper housing 4 is sleeved on the upper joint 1, a first annular space Y is formed with the central tube 2, and the upper housing 4 and the central tube 2 are provided with corresponding first overflowing holes X which are communicated with the inside of the central tube 2. The upper end of lower casing 5 is connected with the lower extreme of last casing 4 to have with center tube 2 and predetermine the interval, the lower extreme suit of lower casing 5 is on lower clutch 3, and has with lower clutch 3 and predetermine the clearance, and the middle part of lower casing 5 is formed with second annular space Z with center tube 2. The sliding sleeve 6 is arranged at the first overflowing hole X in the first annular space Y and is used for sliding in the first annular space Y under the pushing of pressure, so that the upper shell 4 is communicated with the two first overflowing holes X on the central pipe 2. The rupture disk 7 is disposed on the side wall of the lower joint 3 and is configured to rupture at a predetermined pressure, so that the inside of the center tube 2 communicates with the predetermined gap and the second annular space Z. The delay mechanism 8 is blocked in the second annular space Z and used for communicating the central tube 2 with the second annular space Z at the upper part of the delay mechanism 8 according to preset delay time after being triggered by pressure.

Before the operation, the upper joint 1 and the lower joint 3 are connected with a technical casing and are lowered into the well bore.

When fracturing operation is needed, pressure is pumped into the technical casing from the wellhead, namely pressure liquid is pumped. When the pressure reaches the preset pressure, the rupture disk 7 ruptures, so that the inside of the central tube 2 communicates with the preset gap, the second annular space Z. At this time, the pressure fluid flows into the second annular space Z through a preset gap formed by the lower joint 3 and the lower shell 5, the delay mechanism 8 in the second annular space Z is triggered, and after the delay mechanism 8 is triggered, the central tube 2 is communicated with the second annular space Z on the upper portion of the delay mechanism 8 according to preset delay time, so that the pressure fluid flows upwards to the sliding sleeve 6 in the first annular space Y. The sliding sleeve 6 slides upwards in the first annular space Y under the pushing of the pressure, so that the upper shell 4 is communicated with the two first overflowing holes X on the central pipe 2, the fracturing channel is opened, and the first section of fracturing operation can be carried out at the moment.

The time-delay sliding sleeve provided by the embodiment of the invention realizes the connection with a technical casing by arranging the upper joint 1 and the lower joint 3, and is convenient to go into a well. Through setting up center tube 2, go up casing 4 and sliding sleeve 6, and make 4 suit of casing on the top connection 1, be formed with first annular space Y with center tube 2, and go up casing 4 and center tube 2 and be provided with corresponding first overflow hole X, this first overflow hole X communicates with the inside of center tube 2, set up the first overflow hole X department of sliding sleeve 6 in first annular space Y simultaneously, guaranteed that sliding sleeve 6 can slide in first annular space Y under the promotion of pressure, and then make two first overflow hole X on casing 4 and the center tube 2 communicate, so that follow-up fracturing operation carries out. Through setting up rupture disk 7 to make it break under predetermineeing pressure, the inside of center tube 2 when having realized the operation with predetermineeing clearance, the intercommunication of second annular space Z. Through setting up delay mechanism 8 to make delay mechanism 8 shutoff in second annular space Z, receive pressure after triggering according to predetermineeing the delay time, with second annular space Z intercommunication on center tube 2 and the delay mechanism 8 upper portion, can the accurate intercommunication time of first overflowing hole X and the inside of center tube 2, realized the purpose of carrying out the sleeve pipe pressure testing before opening the fracturing passageway. In conclusion, the method can meet the construction requirement of establishing the first-stage fracturing channel, has short period and low cost, and can flexibly configure the pressure test time of the casing.

In order to facilitate the sliding of the sliding sleeve 6 upwards in the first annular space Y under the pushing of the pressure, as shown in fig. 1, the sliding sleeve 6 is fixed in the first annular space Y by a first shear pin 9.

Further, in order to reduce the resistance of the sliding sleeve 6 to slide upward, the first annular space Y at the upper part of the sliding sleeve 6 may be provided as a vacuum chamber.

In the embodiment of the present invention, as shown in fig. 1, the time-delay sliding sleeve further includes: and a pressing cap 10 provided with a liquid passing hole 1001. The side wall of the lower joint 3 is provided with a through hole, and the rupture disk 7 and the pressing cap 10 are arranged in the through hole from inside to outside.

The fixing of the rupture disk 7 in the through hole of the side wall of the lower joint 3 is realized by arranging the pressing cap 10. Through set up liquid hole 1001 on pressure cap 10, guaranteed rupture disk 7 after splitting, pressure liquid can flow into the lower clutch 3 and lower casing 5 formation in the clearance of predetermineeing smoothly.

Specifically, the burst pressure of the burst disk 7 can be lower than the pressure test pressure of the wellhead and the casing, so that the safety of the wellhead device and the casing is ensured. Examples are as follows: the pressure of the wellhead device and the casing pipe reaches 90MPa when pressure test is carried out, and the pressure of the blasting sheet 7 can be set to 50 MPa. The time delay of the time delay sliding sleeve can be set to be 1 hour according to requirements before construction. When the pressure test of the wellhead device is qualified at 90MPa in construction, and when the casing pressure rises to 50MPa, the rupture disk 7 is broken, and the delay sliding sleeve starts to work. During the time delay, the pressure of the casing can be continuously increased to 90MPa for pressure test. After the pressure test is finished for 30 minutes, the pressure of a wellhead can be reduced to 50MPa, and after the delay time is reached, the delay sliding sleeve pushes and exposes the fracturing channel. The first stage fracturing operation may continue at this point.

Wherein, press cap 10 can with lower clutch 3 threaded connection, specifically, can set up the external screw thread on pressing cap 10, set up the internal thread with this external screw thread looks adaptation at the through-hole of lower clutch 3 lateral wall.

In order to facilitate the striking and triggering of the delay mechanism 8, as shown in fig. 1, the delay sliding sleeve further comprises: a ring structure 11. The ring structure 11 is fixed in the second annular space Z below the delay mechanism 8 by means of a second shear pin 12.

In order to facilitate the delayed communication between the central tube 2 and the second annular space Z on the upper portion of the delay mechanism 8, and facilitate the subsequent pressure test of the casing, as shown in fig. 3, the delay mechanism 8 includes: sleeve 801, electric push rod 802, pin 803 and top plate 804. The central tube 2 and the sleeve 801 are provided with a second overflowing hole V, and the second overflowing hole V is communicated with the inside of the central tube 2 and corresponds to the position of the pin body 803. The pin 803 and the electric push rod 802 are disposed in the sleeve 801 from top to bottom. The top plate 804 is provided at the tip of the sleeve 801 and abuts against the pin 803. The electric push rod 802 is used for pushing the pin 803 upwards to push the top plate 804 according to a preset delay time.

When the delay mechanism 8 is triggered to operate, the electric push rod 802 moves upwards according to the preset delay time, and pushes the pin 803 to move upwards, so as to knock the top plate 804, so that the central tube 2 is communicated with the second annular space Z on the upper part of the delay mechanism 8, and then the pressure fluid flows to the sliding sleeve in the first annular space Y along the second overflowing hole V.

Further, as shown in fig. 2, the electric putter 802 includes: a casing 8021, a battery 8022 arranged in the casing 8021, a circuit board 8023, an actuator 8024, a push rod 8025, and a trigger switch 8026 arranged at the lower end of the casing 8021. The battery 8022, the circuit board 8023, the actuator 8024, and the trigger switch 8026 are electrically connected in sequence. The circuit board 8023 is used for controlling the operation of the actuator 8024 according to a preset delay time. The actuator 8024 is used to push the push rod 8025 to protrude upward from the housing 8021.

When the trigger switch 8026 is triggered by the upward movement of the ring structure 11, the actuator 8024 pushes the push rod 8025 to extend upward from the housing 8021 after a preset delay time under the control of the circuit board 8023, and the push rod impacts the pin 803 upward.

By providing the battery 8022, the power supply to the entire electric putter 802 is realized. By providing the circuit board 8023, the operation of the actuator 8024 can be controlled according to the preset delay time. By providing the actuator 8024, power is provided to the push rod 8025 to push the push rod 8025 to extend upward from the housing 8021.

The battery 8022 is used to supply power to the electric push rod 802. The circuit board 8023 may be a time delay electronic chip. The actuator 8024 may include: an electric motor, a decelerator, a motor, etc., as long as the push rod 8025 can be pushed to extend upward from the housing 8021.

In order to ensure that the upper joint 1, the central pipe 2 and the lower joint 3 are connected and fastened, and meanwhile, the upper joint 1, the central pipe 2 and the lower joint 3 can be sequentially connected through threads.

In order to ensure that the upper shell 4 is tightly connected with the lower shell 5 and is convenient to detach, the upper shell 4 can be connected with the lower shell 5 in a threaded mode.

In order to ensure that the upper shell 4 is connected and fastened with the upper joint 1 and the lower shell 5 is connected and fastened with the lower joint 3, and meanwhile, the upper shell 4 and the upper joint 1 can be connected in a threaded mode, and the lower shell 5 and the lower joint 3 can be connected in a threaded mode.

In addition, in order to ensure that all components in the time-delay sliding sleeve have good sealing performance, a sealing ring can be arranged between the upper joint 1 and the central pipe 2, and a sealing ring is arranged between the upper joint 1 and the upper shell 4; a sealing ring is arranged between the upper shell 4 and the lower shell 5; a sealing ring is arranged between the central pipe 2 and the lower joint 3; a sealing ring is provided between the lower housing 5 and the lower joint 3. Sealing rings are arranged between the sleeve 801, the electric push rod 802 and the pin body 803; and sealing rings are arranged between the ring body structure 11 and the central tube 2 and between the ring body structure and the lower shell 5.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A time delay slip, comprising: the upper joint (1), the central pipe (2) and the lower joint (3) are sequentially connected from top to bottom;

the upper shell (4) is sleeved on the upper joint (1), a first annular space (Y) is formed between the upper shell and the central pipe (2), corresponding first overflowing holes (X) are formed in the upper shell (4) and the central pipe (2), and the first overflowing holes (X) are communicated with the inside of the central pipe (2);

the upper end of the lower shell (5) is connected with the lower end of the upper shell (4) and has a preset distance with the central pipe (2), the lower end of the lower shell (5) is sleeved on the lower joint (3) and has a preset gap with the lower joint (3), and a second annular space (Z) is formed between the middle part of the lower shell (5) and the central pipe (2);

the sliding sleeve (6) is arranged at the first overflowing hole (X) in the first annular space (Y) and used for sliding in the first annular space (Y) under the pushing of pressure so that the upper shell (4) is communicated with the two first overflowing holes (X) in the central pipe (2);

the rupture disk (7) is arranged on the side wall of the lower joint (3) and is used for rupturing under preset pressure so as to enable the interior of the central tube (2) to be communicated with the preset gap and the second annular space (Z);

and the delay mechanism (8) is blocked in the second annular space (Z) and is used for communicating the central pipe (2) with the second annular space (Z) at the upper part of the delay mechanism (8) according to preset delay time after being triggered by pressure.

2. The delay sleeve as claimed in claim 1, wherein the sleeve (6) is fixed in the first annular space (Y) by means of first shear pins (9).

3. The time-delay sliding sleeve of claim 1, further comprising: a pressure cap (10) provided with a liquid passing hole (1001);

a through hole is formed in the side wall of the lower joint (3);

the rupture disk (7) and the pressure cap (10) are arranged in the through hole from inside to outside.

4. The time-delay sliding sleeve of claim 1, further comprising: and the ring body structure (11) is fixed in the second annular space (Z) at the lower part of the time delay mechanism (8) through a second shear pin (12).

5. The delay sleeve of claim 1, wherein the delay mechanism (8) comprises: a sleeve (801), an electric push rod (802), a pin body (803) and a top plate (804);

a second overflowing hole (V) is formed in the central pipe (2) and the sleeve (801), is communicated with the inside of the central pipe (2), and corresponds to the position of the pin body (803);

the pin body (803) and the electric push rod (802) are arranged in the sleeve (801) from top to bottom;

the top plate (804) is arranged at the top end of the sleeve (801) and is abutted against the pin body (803);

the electric push rod (802) is used for pushing the pin body (803) upwards according to preset delay time to knock the top plate (804).

6. The delay sleeve of claim 5 wherein said electric push rod (802) comprises: the device comprises a shell (8021), a battery (8022) arranged in the shell (8021), a circuit board (8023), an execution element (8024), a push rod (8025) and a trigger switch (8026) arranged at the lower end of the shell (8021);

the battery (8022), the circuit board (8023), the actuator (8024) and the trigger switch (8026) are electrically connected in sequence;

the circuit board (8023) is used for controlling the execution element (8024) to work according to preset delay time;

the actuating element (8024) is used for pushing the ejector rod (8025) to extend upwards from the shell (8021).

7. The time-delay sliding sleeve as claimed in claim 1, wherein said first annular space (Y) at the upper part of said sliding sleeve (6) is a vacuum chamber.

8. The time-delay sliding sleeve as claimed in claim 1, wherein the upper joint (1), the central tube (2) and the lower joint (3) are sequentially connected by screw threads.

9. The time-delay sliding sleeve as claimed in claim 1, wherein the upper housing (4) is screwed with the lower housing (5).

10. The time delay sliding sleeve as claimed in claim 1, wherein a sealing ring is arranged between the upper joint (1) and the central tube (2).