CN113530508B

CN113530508B - Time delay sliding sleeve

Info

Publication number: CN113530508B
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: 2023-05-26
Anticipated expiration: 2040-04-15
Also published as: CN113530508A

Abstract

The invention discloses a time delay sliding sleeve, which comprises: the upper joint, the central tube, 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, a first annular space is formed between the upper shell and the central tube, and corresponding first overflow holes are formed between the upper shell and the central tube and are communicated with the inside of the central tube. The upper end of the lower shell is connected with the lower end of the upper shell, a preset distance is reserved between the lower end of the lower shell and the central tube, the lower end of the lower shell is sleeved on the lower joint, a preset gap is reserved between the lower end of the lower shell and the lower joint, and a second annular space is formed between the middle of the lower shell and the central tube. The delay mechanism is blocked in the second annular space and is used for communicating the preset gap with the first annular space according to the preset delay time after being triggered by pressure. The invention not only can meet the construction requirement of establishing the first stage fracturing channel, has short period and low cost, but also can flexibly configure the casing pressure test time.

Description

Time delay sliding sleeve

Technical Field

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

Background

In unconventional reservoir development, staged fracturing operations are typically required to improve the flow environment of oil in the subsurface, increasing well production. It is important to establish a first stage of fracture passages in the oil and gas well prior to the fracturing operation.

Related art prior to performing a fracturing operation, a first stage of fracturing channels are established in the oil and gas well by perforating the fracturing string through the coiled tubing or conventionally activating a sliding sleeve.

The inventors found that the prior art has at least the following problems:

if the fracturing operation is required to be carried out in a deeper horizontal well, the continuous oil pipe is perforated on the fracturing string, so that a first stage fracturing channel is established in the oil and gas well, 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-stage fracturing channel, has short period and low cost, but also can flexibly configure the casing pressure test time, and comprises the following components:

an upper joint, a central tube and a lower joint which are sequentially connected from top to bottom;

the upper shell is sleeved on the upper connector, a first annular space is formed between the upper shell and the central tube, a corresponding first overflow hole is formed between the upper shell and the central tube, and the first overflow hole is communicated with the inside of the central tube;

the upper end of the lower shell is connected with the lower end of the upper shell and has a preset interval with the central tube, 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 part of the lower shell and the central tube;

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

a rupture disk disposed on a sidewall of the lower joint for rupturing under a predetermined pressure to communicate an interior of the center tube with the predetermined gap and the second annular space;

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

the time delay mechanism includes: sleeve, electric push rod, pin body and top plate;

the central tube and the sleeve are provided with second overflow holes which are communicated with the inside of the central tube and correspond to the positions of the pin bodies;

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 according to preset delay time to knock the top plate.

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

Optionally, the delay sliding sleeve further includes: a press cap provided with a liquid passing hole;

the side wall of the lower joint is provided with a through hole;

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

Optionally, the delay sliding sleeve further includes: the ring 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 electric putter includes: the device comprises a shell, a battery, a circuit board, an executing element, a push rod and a trigger switch, wherein the battery, the circuit board, the executing element and the push rod are arranged in the shell;

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

the circuit board is used for controlling the executive component 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 at the upper part of the sliding sleeve is a vacuum cavity.

Optionally, the upper joint, the central tube and the lower joint are sequentially connected in a threaded manner.

Optionally, the upper housing is screwed with the lower housing.

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

In the embodiment of the invention, the upper joint and the lower joint are arranged, so that the connection with the technical sleeve is realized, and the well is conveniently put into the well. Through setting up center tube, go up casing and sliding sleeve to make last casing suit on the upper joint, be formed with first annular space with the center tube, and go up the casing and be provided with corresponding first overflow hole with the center tube, this first overflow hole communicates with the inside of center tube, with the first overflow hole department of sliding sleeve setting in first annular space simultaneously, guaranteed that the sliding sleeve can slide in first annular space under the promotion of pressure, and then make two first overflow holes intercommunication on last casing and the center tube, so that carry out follow-up fracturing operation. Through setting up the rupture disk to make it break under predetermineeing pressure, realized the inside of center tube and predetermineeing clearance, the intercommunication of second annular space when the operation. Through setting up time delay mechanism to make time delay mechanism shutoff in the second annular space, according to predetermineeing delay time after receiving pressure triggering, with the second annular space intercommunication on center tube and time delay mechanism upper portion, can the inside communication time of first overflow hole and center tube of accurate control, realized carrying out the purpose of sleeve pipe pressure testing before opening the fracturing passageway. In summary, the invention not only can meet the construction requirement of establishing the first stage fracturing channel, has short period and low cost, but also can flexibly configure the casing pressure test time.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:

FIG. 1 is a schematic structural diagram of a delay runner in 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 numerals are as follows:

1 an upper joint of the two-way valve,

2 a central tube, wherein the central tube is provided with a plurality of holes,

3 a lower joint is arranged on the lower joint,

4 an upper shell body is arranged on the upper shell body,

5 a lower shell body, wherein the lower shell body is provided with a lower shell body,

6 a sliding sleeve is arranged on the inner side of the sleeve,

a burst disk of 7 a number of the burst disk,

an 8-time delay mechanism is provided with a first time delay mechanism,

801 a sleeve, the sleeve is provided with a sleeve,

an 802 electric push rod is provided with a first electric push rod,

an 8021 housing, which is provided with a cavity,

an 8022 battery, which is a battery,

an 8023 circuit board, which is a printed circuit board,

an 8024 actuator element which is configured to be coupled to the control device,

an 8025 push rod is arranged on the upper part of the upper part,

the 8026 triggers the switch to be turned on,

803 the pin body,

a top plate 804 of the top plate,

9 a first shear pin is provided, which is provided with a first shear pin,

10 the cap is pressed down,

1001 the liquid passing hole is arranged on the bottom of the liquid passing hole,

the 11-ring body structure is provided with a plurality of ring bodies,

a second shear pin is provided at 12 which,

the first flow-through hole of the X-shaped valve,

a first annular space of the shape of the Y,

a second annular space is provided in the second annular space,

and V a second overflow hole.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.

In the description of the present specification, the terms "comprising," "including," "having," "containing," and the like are open-ended terms, meaning including, but not limited to. Reference to 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 present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 used to schematically illustrate the practice of the present application, and is not limited thereto and may be appropriately adjusted as desired.

The embodiment of the invention provides a time delay sliding sleeve, as shown in a figure 1, which comprises the following components: the upper joint 1, the central tube 2, the lower joint 3, the upper shell 4, the lower shell 5, the sliding sleeve 6, the rupture disk 7 and the delay mechanism 8 are sequentially connected from top to bottom. Wherein, the upper shell 4 is sleeved on the upper joint 1, a first annular space Y is formed with the central tube 2, and the upper shell 4 and the central tube 2 are provided with corresponding first overflow holes X which are communicated with the inside of the central tube 2. The upper end of the lower shell 5 is connected with the lower end of the upper shell 4 and has a preset interval with the central tube 2, the lower end of the lower shell 5 is sleeved on the lower joint 3 and has a preset interval 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 tube 2. The sliding sleeve 6 is arranged at the first overflow holes 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 overflow holes X on the central tube 2. A rupture disc 7 is provided on the side wall of the lower joint 3 for rupturing under a predetermined pressure, communicating the interior of the central tube 2 with the predetermined gap, the second annular space Z. The delay mechanism 8 is blocked in the second annular space Z and is used for communicating the central tube 2 with the second annular space Z at the upper part of the delay mechanism 8 according to the preset delay time after being triggered by pressure.

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

When the fracturing operation is needed, the pressure is pumped into the technical casing from the wellhead, namely, the pressure liquid is pumped in. When the pressure reaches a preset pressure, the rupture disc 7 ruptures, putting the inside of the central tube 2 in communication with the preset gap, the second annular space Z. At this time, the pressure fluid flows into the second annular space Z through the preset gap formed between the lower connector 3 and the lower housing 5, and triggers the delay mechanism 8 in the second annular space Z, and after the delay mechanism 8 is triggered, the central tube 2 is communicated with the second annular space Z at the upper part of the delay mechanism 8 according to the preset delay time, so that the pressure fluid flows upward 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 pressure, so that the upper shell 4 is communicated with the two first overflow holes X on the central tube 2, namely, a fracturing channel is opened, and at the moment, the first stage fracturing operation can be performed.

The time delay sliding sleeve provided by the embodiment of the invention realizes the connection with the technical sleeve by arranging the upper joint 1 and the lower joint 3, and is convenient to be put into a well. Through setting up center tube 2, go up casing 4 and sliding sleeve 6, and make the cover of last casing 4 on last joint 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 sliding sleeve 6 in the first overflow hole X department of 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 holes X intercommunication on last casing 4 and the center tube 2, so that carry out subsequent fracturing operation. By providing the rupture disc 7 and breaking it at a predetermined pressure, communication of the interior of the central tube 2 with the predetermined gap, the second annular space Z, is achieved during operation. Through setting up time delay mechanism 8 to make time delay mechanism 8 shutoff in second annular space Z, according to predetermineeing delay time after receiving pressure triggering, with the second annular space Z intercommunication on center tube 2 and time delay mechanism 8 upper portion, can the accurate control first flow through hole X with the inside intercommunication time of center tube 2, realized carrying out the purpose of sleeve pipe pressure testing before opening the fracturing passageway. In summary, the invention not only can meet the construction requirement of establishing the first stage fracturing channel, has short period and low cost, but also can flexibly configure the casing pressure test time.

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

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

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

By arranging the pressure cap 10, the rupture disk 7 is fixed in the through hole on the side wall of the lower joint 3. By providing the through-hole 1001 in the pressure cap 10, it is ensured that after the rupture disc 7 is ruptured, the pressure fluid can smoothly flow into the preset gap formed by the lower connector 3 and the lower housing 5.

Specifically, the burst pressure of the burst disk 7 may be lower than the pressure test pressure of the wellhead and casing, thus ensuring the safety of the wellhead and casing. Examples are as follows: the wellhead pump pressure of the wellhead device and the sleeve in pressure test is qualified in the direction of 90MPa, and the bursting pressure of the bursting disc 7 can be set to be 50MPa. The delay time of the delay sliding sleeve can be set to be 1 hour according to the requirements before construction. After the wellhead device pressure test is qualified in the construction process, when the casing pressure rises to 50MPa, the rupture disk 7 breaks, and the delay sliding sleeve starts to work. During the time delay, the sleeve pressure can be continuously increased to 90MPa for pressure test. After the pressure test is finished for 30 minutes, the pressure of the 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.

The press cap 10 may be screwed with the lower joint 3, specifically, an external thread may be provided on the press cap 10, and an internal thread adapted to the external thread may be provided in a through hole in a sidewall of the lower joint 3.

To facilitate the striking and triggering of the delay mechanism 8, as shown in fig. 1, the delay runner further comprises: a ring structure 11. The ring structure 11 is fixed in a second annular space Z in the lower part of the time 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 at the upper part of the delay mechanism 8, and facilitate the subsequent casing pressure test, as shown in fig. 3, the delay mechanism 8 includes: sleeve 801, electric putter 802, pin 803, top plate 804. Wherein, the central tube 2 and the sleeve 801 are provided with a second overflow hole V which is communicated with the inside of the central tube 2 and corresponds to the position of the pin 803. The pin 803 and the electric push rod 802 are disposed in the sleeve 801 from top to bottom. A top plate 804 is provided at the top end of the sleeve 801 against the pin 803. The electric push rod 802 is used for pushing the pin 803 upwards according to a preset delay time, and the top plate 804 is crashed.

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 crash the top plate 804, so that the central tube 2 is communicated with the second annular space Z above the delay mechanism 8, and then the pressure liquid flows to the sliding sleeve in the first annular space Y along the second overflow hole V.

Further, as shown in fig. 2, the electric putter 802 includes: the device comprises a housing 8021, a battery 8022 arranged in the housing 8021, a circuit board 8023, an actuator 8024, a push rod 8025 and a trigger switch 8026 arranged at the lower end of the housing 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 plunger 8025 upwardly 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 ejector rod 8025 to extend upward from the housing 8021 after a preset delay time under the control of the circuit board 8023, and impacts the pin 803 upward.

By providing the battery 8022, power supply to the electric putter 802 as a whole is realized. By providing the circuit board 8023, the actuator 8024 can be controlled to operate according to a preset delay time. By providing the actuator 8024, power is provided to the plunger 8025 to urge the plunger 8025 to extend upwardly from the housing 8021.

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

In order to ensure that the upper joint 1, the central tube 2 and the lower joint 3 are connected and fastened, and simultaneously, the upper joint 1, the central tube 2 and the lower joint 3 can be connected in sequence in a threaded manner, so that the disassembly is convenient.

In order to ensure that the upper housing 4 and the lower housing 5 are connected and fastened, and at the same time, the upper housing 4 and the lower housing 5 can be connected by screw threads.

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, the upper shell 4 can be connected with the upper joint 1 in a threaded manner and the lower shell 5 can be connected with the lower joint 3 in a threaded manner.

In addition, in order to ensure good tightness among the components in the time delay sliding sleeve, a sealing ring can be arranged between the upper joint 1 and the central tube 2, and a sealing ring can be 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 tube 2 and the lower joint 3; a sealing ring is arranged 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 803; a sealing ring is arranged between the ring body structure 11 and the central tube 2 and the lower shell 5.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. A time delay sliding sleeve, comprising: an upper joint (1), a central tube (2) and a lower joint (3) which 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 tube (2), the upper shell (4) and the central tube (2) are provided with corresponding first overflow holes (X), and the first overflow holes (X) are communicated with the inside of the central tube (2);

the upper end of the lower shell (5) is connected with the lower end of the upper shell (4) and has a preset interval with the central tube (2), the lower end of the lower shell (5) is sleeved on the lower joint (3) and has a preset interval 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 tube (2);

a sliding sleeve (6) 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 as to enable the upper shell (4) to be communicated with the two first overflowing holes (X) on the central tube (2);

a rupture disc (7) arranged on the side wall of the lower joint (3) for rupturing under a preset pressure, communicating the interior of the central tube (2) with the preset gap, the second annular space (Z);

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

the delay mechanism (8) includes: a sleeve (801), an electric push rod (802), a pin body (803) and a top plate (804);

the central tube (2) and the sleeve (801) are provided with second overflow holes (V), and the second overflow holes (V) are communicated with the inside of the central tube (2) and correspond to the positions of the pin bodies (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 propped 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).

2. A time delay runner according to claim 1, characterized in that said runner (6) is fixed in said first annular space (Y) by means of a first shear pin (9).

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

the side wall of the lower joint (3) is provided with a through hole;

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

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

5. The delay runner of claim 1, wherein said electric push rod (802) comprises: a housing (8021), a battery (8022) arranged in the housing (8021), a circuit board (8023), an actuating element (8024), a push rod (8025) and a trigger switch (8026) arranged at the lower end of the housing (8021);

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

the circuit board (8023) is used for controlling the operation of the executive component (8024) according to a preset delay time;

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

6. A time delay sleeve according to claim 1, characterized in that said first annular space (Y) in the upper part of said sleeve (6) is a vacuum chamber.

7. The time delay sliding sleeve as claimed in claim 1, characterized in that the upper joint (1), the central tube (2) and the lower joint (3) are sequentially screwed.

8. The time delay sliding sleeve according to claim 1, characterized in that the upper housing (4) is screwed with the lower housing (5).

9. A time delay slip according to claim 1, characterized in that a sealing ring is arranged between the upper joint (1) and the central tube (2).