A drilling-free graded cementing device and use method thereof

Abstract

The present invention relates to the technical field of oil well cementing, and specifically to a drilling-free graded cementing device and a method of using the same, comprising a cementing device body, a plurality of limiting parts, a connecting ring, an opening seat, a sliding plug and a pressing plug, a plurality of liquid outlets are respectively arranged on one side of a plurality of connecting grooves, a retaining ring is arranged on one side of the connecting groove, a plurality of limiting parts are respectively arranged in the connecting groove, the limiting parts comprise a sliding block and a limiting block, the sliding block is slidingly arranged on one side of the retaining ring, the limiting block is fixedly connected to the sliding block, the connecting ring is fixed at the bottom of the cementing device body, the opening seat is slidingly arranged at the bottom of the connecting ring, a plurality of connecting holes are arranged on the sliding plug, the sliding plug is arranged in the opening seat, and the longitudinal sliding position of the sliding plug is limited by the limiting block, and the pressing plug is arranged on the top of the sliding plug, and is used to push the sliding block to release the restriction of the limiting block on the sliding plug. The graded cementing can be carried out more conveniently, and drilling is not required after the cementing is completed, thereby improving the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum cementing, and in particular to a drilling-free staged cementing device and a use method thereof. Background Art

[0002] The drill-free staged cementing tool is a special tool used in oil and gas well completion operations. Its main function is to achieve segmented cementing during the cementing process. Unlike the traditional method that requires special drilling of isolation plugs, the drill-free staged cementing tool does not require subsequent drilling operations, which can significantly improve construction efficiency and reduce operating costs. This tool usually contains a special mechanical structure or chemical release mechanism that can automatically open or close the cement flow channel at a predetermined depth to ensure that cement is accurately injected into the target formation, thereby effectively isolating different formation pressure systems, protecting the oil and gas layers and enhancing the integrity of the wellbore.

[0003] The existing drilling-free staged cementing device needs to drill holes to open the pipeline for subsequent processing after the operation is completed, which increases the operation steps and reduces the work efficiency. Summary of the invention

[0004] The object of the present invention is to provide a drilling-free graded cementing device and a use method, so as to facilitate graded cementing without drilling holes after cementing, thereby improving construction efficiency.

[0005] To achieve the above-mentioned purpose, the present invention provides a drilling-free graded cementing device, comprising a cementing device body, a plurality of limiting members, a connecting ring, an opening seat, a sliding plug and a pressing plug, wherein the cementing device body has a plurality of connecting grooves and a plurality of liquid outlets, wherein the plurality of liquid outlets are respectively arranged on one side of the plurality of connecting grooves, a retaining ring is arranged on one side of the connecting groove, and the plurality of limiting members are respectively arranged in the connecting grooves, wherein the limiting members comprise a sliding block and a limiting block, wherein the sliding block has a first step and a second step, wherein the sliding block is slidingly arranged on one side of the retaining ring, wherein a first hole is opened on the limiting block, wherein the limiting block is fixedly connected to the sliding block and is located at the bottom of the sliding block, wherein the connecting ring has a first limiting groove, wherein the connecting ring is fixed at the bottom of the cementing device body, wherein the opening seat is slidingly arranged at the bottom of the connecting ring, wherein a plurality of communicating holes are arranged on the sliding plug, wherein the sliding plug is arranged in the opening seat, and the longitudinal sliding position of the sliding plug is limited by the limiting block, and the pressing plug is arranged at the top of the sliding plug, and is used to push the sliding block to release the restriction of the limiting block on the sliding plug.

[0006] Wherein, the limiting member further comprises a supporting spring, and the supporting spring is arranged between the limiting block and the cement injector body.

[0007] Wherein, the opening seat includes a first ring, a second ring and a first limiting ring, the first ring is arranged in the connecting ring, the second ring is fixed at the bottom of the first ring, and the first limiting ring is fixed in the first ring for limiting the sliding plug.

[0008] Wherein, the cross-sectional area of ​​the first ring is smaller than the cross-sectional area of ​​the second ring.

[0009] The sliding plug comprises a sliding plug body, a sealing block and a second spring. The sealing block is slidably connected to the sliding plug body and is located at the bottom of the sliding plug body. The second spring is arranged between the sealing block and the sliding plug body.

[0010] Wherein, the press plug comprises a press plug body and a push rod, and the push rod is fixedly connected to the press plug body and is located on one side of the sealing block.

[0011] Wherein, the press plug further comprises a clamping rod, the clamping rod is fixed on the press plug body, and a clamping groove is arranged on the sliding plug body corresponding to the clamping rod.

[0012] In a second aspect, the present invention further provides a method for using a drilling-free staged cementing device, comprising: placing a cementing device body in a pipe well;

[0013] The opening seat is pressed by the fluid in the pipe well and shrinks into the cementing device body, and at the same time pushes the connecting hole and the liquid outlet hole of the sliding plug to be misaligned;

[0014] injecting slurry into the top of the sliding plug through the cementing device body;

[0015] As the pressure increases, the sliding plug is pushed downward, so that the communication hole and the liquid outlet hole are connected, so that the mud flows into the outside of the cementing device body;

[0016] Put the pressure plug into the top of the sliding plug and continue to apply downward pressure to make the mud fully discharge to the outside, further squeeze the pressure plug, so that the pressure plug pushes the sliding block to slide, and the sliding block contacts the first step and the retaining ring under the action of gravity, and then contacts the second step and the retaining ring. At this time, the first hole on the limit block and the liquid outlet hole on the cementing device body are misaligned and closed, and the sliding plug releases the limit at the same time, so that the opening seat that can be driven down from the cementing device body can fall off.

[0017] The present invention provides a drill-free graded cementing device and a method of using the cementing device. The cementing device body is the basic part of the entire tool, which is usually made of high-strength material and can withstand the high-pressure environment underground. There are multiple connecting grooves on the body, which are used to install limiters, and each groove is equipped with a liquid outlet next to it. The liquid outlet is used to transport cement slurry from the inside of the cementing device to the surrounding of the well wall to achieve the purpose of cement grouting. A retaining ring is provided on one side of each connecting groove to limit the moving range of the sliding block. The limiter includes two parts: a sliding block and a limit block. The sliding block has a first step and a second step, and can slide on one side of the retaining ring to control the position of the limit block. The limit block is fixedly connected to the sliding block and is located at the bottom of the sliding block. The limit block is provided with a first hole for passing mud.

[0018] When in use, the cementing device body is placed in the pipe well; the opening seat is pressed by the fluid in the pipe well and shrinks into the cementing device body, and at the same time, the connecting hole and the liquid outlet hole of the sliding plug are displaced; mud is injected into the top of the sliding plug through the cementing device body; as the pressure increases, the sliding plug is pushed downward to make the connecting hole and the liquid outlet hole connected, so that the mud flows into the outside of the cementing device body; the pressure plug is placed on the top of the sliding plug and pressure is continuously applied downward to make the mud fully discharged to the outside, further squeezing the pressure plug, so that the pressure plug pushes the sliding block to slide, and the sliding block contacts the first step and the retaining ring under the action of gravity, and contacts the second step and the retaining ring. At this time, the first hole on the limit block and the liquid outlet hole on the cementing device body are displaced and closed, and at the same time, the sliding plug releases the limit, so that the opening seat driven by the cementing device body to fall off, thereby achieving the effect of permanent self-sealing of the circulation hole, without the need for drilling, the operation process is more convenient, and the construction efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural diagram of a drilling-free staged cementing device according to the first embodiment of the present invention.

[0021] Figure 2 It is a cross-sectional structural diagram of a drilling-free staged cementing device according to the first embodiment of the present invention.

[0022] Figure 3 yes Figure 2 A partial enlargement of detail A.

[0023] Figure 4 yes Figure 2 A partial enlargement of detail B.

[0024] Figure 5 It is a flow chart of a method for using a drilling-free staged cementing device according to the second embodiment of the present invention.

[0025] Cement injector body 101, limit piece 102, connecting ring 103, opening seat 104, sliding plug 105, pressing plug 106, connecting groove 107, liquid outlet hole 108, sliding block 109, limit block 110, first step 111, second step 112, first hole 113, first limit groove 114, connecting hole 115, supporting spring 116, first ring 117, second ring 118, first limit ring 119, sliding plug body 120, sealing block 121, second spring 122, pressing plug body 123, push rod 124, clamping rod 125, clamping groove 126. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] First embodiment:

[0029] See also Figure 1~Figure 4The present invention provides a drilling-free graded cementing device, comprising a cementing device body, a plurality of limiting members, a connecting ring, an opening seat, a sliding plug and a pressing plug, wherein the cementing device body has a plurality of connecting grooves and a plurality of liquid outlets, wherein the plurality of liquid outlets are respectively arranged on one side of the plurality of connecting grooves, a retaining ring is arranged on one side of the connecting groove, and the plurality of limiting members are respectively arranged in the connecting grooves, wherein the limiting members comprise a sliding block and a limiting block, wherein the sliding block has a first step and a second step, wherein the sliding block is slidingly arranged on one side of the retaining ring, wherein a first hole is opened on the limiting block, wherein the limiting block is fixedly connected to the sliding block and is located at the bottom of the sliding block, wherein the connecting ring has a first limiting groove, wherein the connecting ring is fixed at the bottom of the cementing device body, wherein the opening seat is slidingly arranged at the bottom of the connecting ring, wherein a plurality of communicating holes are arranged on the sliding plug, wherein the sliding plug is arranged in the opening seat, and the longitudinal sliding position of the sliding plug is limited by the limiting block, and the pressing plug is arranged at the top of the sliding plug, and is used to push the sliding block to release the restriction of the limiting block on the sliding plug.

[0030] In this embodiment, the cement injector body is the basic part of the entire tool, which is usually made of high-strength material and can withstand the high-pressure environment underground. There are multiple connecting grooves on the body, which are used to install the limiter, and each groove is equipped with a liquid outlet next to it. The liquid outlet is used to transport cement slurry from the inside of the cement injector to the surrounding of the well wall to achieve the purpose of cement grouting. A retaining ring is provided on one side of each connecting groove to limit the moving range of the sliding block. The limiter includes two parts, a sliding block and a limiter. The sliding block has a first step and a second step, which can slide on one side of the retaining ring to control the position of the limiter. The limiter is fixedly connected to the sliding block and is located at the bottom of the sliding block. The limiter is provided with a first hole for passing mud.

[0031] When in use, the cementing device body is placed in the pipe well; the opening seat is pressed by the fluid in the pipe well and shrinks into the cementing device body, and at the same time, the connecting hole and the liquid outlet hole of the sliding plug are displaced; mud is injected into the top of the sliding plug through the cementing device body; as the pressure increases, the sliding plug is pushed downward to make the connecting hole and the liquid outlet hole connected, so that the mud flows into the outside of the cementing device body; the pressure plug is placed on the top of the sliding plug and pressure is continuously applied downward to make the mud fully discharged to the outside, further squeezing the pressure plug, so that the pressure plug pushes the sliding block to slide, and the sliding block contacts the first step and the retaining ring under the action of gravity, and contacts the second step and the retaining ring. At this time, the first hole on the limit block and the liquid outlet hole on the cementing device body are displaced and closed, and at the same time, the sliding plug releases the limit, so that the opening seat driven by the cementing device body to fall off, thereby achieving the effect of permanent self-sealing of the circulation hole, without the need for drilling, the operation process is more convenient, and the construction efficiency is improved.

[0032] The limiting member further comprises a supporting spring, and the supporting spring is arranged between the limiting block and the cement injector body.

[0033] The support spring is arranged between the limit block and the cement injector body, and its function is to maintain the position of the sliding block to avoid sliding due to accidental force.

[0034] The opening seat includes a first ring, a second ring and a first limiting ring. The first ring is arranged in the connecting ring, the second ring is fixed to the bottom of the first ring, and the first limiting ring is fixed in the first ring for limiting the sliding plug.

[0035] The first ring is arranged in the connecting ring, and is used to cooperate with the connecting ring to limit the movement range of the opening seat. The second ring is fixed at the bottom of the first ring, and the first limiting ring is fixed in the first ring, and is used to limit the sliding plug to prevent it from excessive movement.

[0036] The cross-sectional area of ​​the first ring is smaller than the cross-sectional area of ​​the second ring.

[0037] The cross-sectional area of ​​the second ring is larger than that of the first ring. Such a design helps to improve the overall stability and strength of the opening seat.

[0038] The sliding plug comprises a sliding plug body, a sealing block and a second spring. The sealing block is slidably connected to the sliding plug body and is located at the bottom of the sliding plug body. The second spring is arranged between the sealing block and the sliding plug body.

[0039] The sliding plug body contacts the first limiting ring in the opening seat to limit its range of movement. The sealing block is slidably connected to the sliding plug body and is located at the bottom of the sliding plug body. It is used to maintain sealing in a normal state. When the pressure plug moves downward, the sealing block body can be pushed away to reduce the pressure on the bottom, so that the sliding plug body can fall off faster. The second spring is arranged between the sealing block and the sliding plug body to enable the sealing block to close the sliding plug body when there is no external force.

[0040] The press plug comprises a press plug body and a push rod, wherein the push rod is fixedly connected to the press plug body and is located at one side of the sealing block.

[0041] The plug body is located at the top of the sliding plug. Push rod: It is fixedly connected to the plug body and is located on one side of the sealing block. When the plug moves downward, the push rod pushes the sealing block, thereby moving the sealing block.

[0042] The press plug further comprises a clamping rod, which is fixed on the press plug body, and a clamping groove is arranged on the sliding plug body corresponding to the clamping rod.

[0043] The clamping rod is fixed on the pressing plug body and is used to cooperate with the clamping groove on the sliding plug body to ensure that the pressing plug and the sliding plug are stably connected so that they can fall off together.

[0044] Second embodiment:

[0045] See also Figure 5 Based on the first embodiment, the present invention further provides a method for using a drilling-free staged cementing device, comprising:

[0046] S201: placing the cementing device body in the pipe well;

[0047] The entire cementing machine body is placed at the predetermined position in the wellbore through the drill pipe or other conveying tools. Prepare to start cementing operations to reinforce the wellbore wall and isolate different geological layers.

[0048] S202 The opening seat is pressed by the fluid in the pipe well and shrinks into the cementing device body, and at the same time pushes the connecting hole and the liquid outlet hole of the sliding plug to be misaligned;

[0049] When the cementing device body is in place, the fluid pressure in the pipe well acts on the opening seat, causing it to shrink inward. The movement of the opening seat pushes the sliding plug upward, causing the connecting hole on the sliding plug to be misaligned with the outlet hole on the cementing device body, temporarily preventing the cement from flowing out.

[0050] S203 injecting slurry into the top of the sliding plug through the cementing device body;

[0051] Operation: Use surface equipment (such as a cement pump) to inject cement slurry through the drill pipe into the cement injector body and eventually reach the top of the sliding plug.

[0052] S204: as the pressure increases, the sliding plug is pushed downward, so that the communication hole and the liquid outlet hole are connected, so that the mud flows into the outside of the cementing device body;

[0053] As the pressure of the injected mud gradually increases, the sliding plug is pushed downward until the connecting hole on the sliding plug is aligned with the outlet hole on the cementing device body. The mud flows out through the connecting hole and the outlet hole to the outside of the cementing device body, that is, the annulus of the wellbore.

[0054] S205 puts the pressure plug into the top of the sliding plug and continuously applies downward pressure to make the mud fully drain to the outside, further squeezes the pressure plug, so that the pressure plug pushes the sliding block to slide, and the sliding block contacts the first step and the retaining ring under the action of gravity, and then contacts the second step and the retaining ring. At this time, the first hole on the limit block and the liquid outlet hole on the cementing device body are misaligned and closed, and at the same time, the sliding plug releases the limit, so that the opening seat driven down from the cementing device body can fall off.

[0055] Place the pressure plug on top of the sliding plug and apply continuous pressure downward. As the pressure increases, the mud is fully squeezed into the wellbore annulus, completing the cementing operation. Further pressure causes the pressure plug to push the sliding block to slide, and the sliding block moves from the first step to the second step under the action of gravity and contacts the retaining ring. The first hole on the limit block is misaligned with the outlet hole on the cementing device body, closing the cement channel. As the sliding plug releases the limit, the opening seat falls off under the action of gravity inside the cementing device body, which marks the end of this level of cementing operation, and the opening seat can continue to be lowered for the next stage of operation.

[0056] Through the above steps, the drill-free staged cementing device can efficiently complete the staged cementing task in the underground environment, ensuring the stability of the well wall and the isolation effect.

[0057] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A drilling-free graded cementing device, characterized in that: The invention comprises a cementing device body, a plurality of limiting members, a connecting ring, an opening seat, a sliding plug and a pressing plug, wherein the cementing device body comprises a plurality of connecting grooves and a plurality of liquid outlets, the plurality of liquid outlets are respectively arranged on one side of the plurality of connecting grooves, a retaining ring is arranged on one side of the connecting groove, the plurality of limiting members are respectively arranged in the connecting grooves, the limiting members comprise a sliding block and a limiting block, the sliding block has a first step and a second step, the sliding block is slidingly arranged on one side of the retaining ring, a first hole is opened on the limiting block, the limiting block is fixedly connected to the sliding block and is located at the bottom of the sliding block, the connecting ring has a first limiting groove, the connecting ring is fixed to the bottom of the cementing device body, the opening seat is slidingly arranged at the bottom of the connecting ring, a plurality of communicating holes are arranged on the sliding plug, the sliding plug is arranged in the opening seat, and the longitudinal sliding position of the sliding plug is limited by the limiting block, and the pressing plug is arranged at the top of the sliding plug, and is used to push the sliding block to release the restriction of the limiting block on the sliding plug.

2. A drilling-free staged cementing device as claimed in claim 1, characterized in that: The limiting member further comprises a supporting spring, and the supporting spring is arranged between the limiting block and the cement injector body.

3. A drilling-free staged cementing device as claimed in claim 2, characterized in that: The opening seat comprises a first ring, a second ring and a first limiting ring, the first ring is arranged in the connecting ring, the second ring is fixed to the bottom of the first ring, and the first limiting ring is fixed in the first ring.

4. A drilling-free staged cementing device as claimed in claim 3, characterized in that: The cross-sectional area of ​​the first ring is smaller than the cross-sectional area of ​​the second ring.

5. The drilling-free staged cementing device according to claim 4, characterized in that: The sliding plug comprises a sliding plug body, a sealing block and a second spring. The sealing block is slidably connected to the sliding plug body and is located at the bottom of the sliding plug body. The second spring is arranged between the sealing block and the sliding plug body.

6. The drilling-free staged cementing device according to claim 5, characterized in that: The press plug comprises a press plug body and a push rod, wherein the push rod is fixedly connected to the press plug body and is located at one side of the sealing block.

7. The drilling-free staged cementing device according to claim 6, characterized in that: The press plug further comprises a clamping rod, which is fixed on the press plug body, and a clamping groove is arranged on the sliding plug body corresponding to the clamping rod.

8. A method for using a drilling-free staged cementing device, using the drilling-free staged cementing device according to any one of claims 1 to 7, It is characterized in that include: Place the cementing device body in the pipe well; The opening seat is pressed by the fluid in the pipe well and shrinks into the cementing device body, and at the same time pushes the connecting hole and the liquid outlet hole of the sliding plug to be misaligned; injecting slurry into the top of the sliding plug through the cementing device body; As the pressure increases, the sliding plug is pushed downward, so that the communication hole and the liquid outlet hole are connected, so that the mud flows into the outside of the cementing device body; Put the pressure plug into the top of the sliding plug and continue to apply downward pressure to make the mud fully discharge to the outside, further squeeze the pressure plug, so that the pressure plug pushes the sliding block to slide, and the sliding block contacts the first step and the retaining ring under the action of gravity, and then contacts the second step and the retaining ring. At this time, the first hole on the limit block and the liquid outlet hole on the cementing device body are misaligned and closed, and the sliding plug releases the limit at the same time, so that the opening seat that can be driven down from the cementing device body can fall off.

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