Drill rod passing cement umbrella

Abstract

The drill rod passing cement umbrella comprises an umbrella mechanism, an unfolding piece, an elastic piece and an activating piece, the umbrella mechanism comprises an umbrella rod, an umbrella frame and an umbrella cover, the umbrella frame is connected with the umbrella rod, and the umbrella cover is connected with the umbrella frame; the unfolding piece is fixedly connected with the umbrella rod; the elastic piece is connected between the umbrella stand and the unfolding piece; the activation part is connected with the umbrella rod, when one end of the activation part abuts against the unfolding part and the other end of the activation part locks the umbrella frame, the unfolding part can be driven by the activation part to unfold and release the umbrella frame under the condition that the unfolding part is not subjected to external force, and the umbrella frame can be driven by the elastic part to move relative to the umbrella rod so as to unfold the umbrella cover. The problem that in the prior art, after a cement umbrella slides out of a drill rod, the umbrella cannot be automatically opened is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cement umbrella technical field, concretely relates to a through drill rod cement umbrella. BACKGROUND

[0002] Cement umbrella is a device for downhole pipe string, main function includes preventing cement slurry loss, supporting cement in annulus, preventing or reducing cement slurry loss, ensuring that uniform cement ring is formed near cement umbrella, improving well cementing quality, preventing excessive static pressure of cement column weight on weak formation, avoiding formation damage, and cement slurry and drilling fluid can be isolated, preventing both from settling due to displacement, and ensuring smooth well cementing construction.

[0003] Generally, in downhole operation, cementing plug is one of commonly used process technologies, but in the prior art, cement umbrella is installed in drill rod and installed to specified well depth position through downhole tool, needs to push switch, spring releases elastic force, pushes umbrella rib to unfold, thereby opening umbrella surface, and automatic umbrella opening after cement umbrella slides out of drill rod cannot be realized, and use is relatively inconvenient. UTILITY MODEL CONTENT

[0004] The utility model aims at overcoming the above technical defects, and provides a through drill rod cement umbrella, which solves the problem that cement umbrella cannot be automatically opened after sliding out of the drill rod in the prior art.

[0005] To achieve the above technical purposes, the utility model adopts the following technical scheme:

[0006] The utility model provides a through drill rod cement umbrella, which comprises:

[0007] An umbrella mechanism, which comprises an umbrella rod, an umbrella frame and an umbrella surface, wherein the umbrella frame is connected with the umbrella rod, and the umbrella surface is connected with the umbrella frame;

[0008] An unfolding part, which is fixedly connected with the umbrella rod;

[0009] An elastic part, which is connected between the umbrella frame and the unfolding part; and

[0010] An activation part, which is connected with the umbrella rod, when one end of the activation part abuts against the unfolding part and the other end locks the umbrella frame, the unfolding part is not subjected to external force, the activation part can drive the unfolding part to unfold and release the umbrella frame, and the elastic part can drive the umbrella frame to move relative to the umbrella rod to open the umbrella surface.

[0011] In an embodiment, the activating member comprises an activating tube, a mounting tube, a return spring and at least one locking rod, the activating tube is sleeved on the umbrella rod, the mounting tube is fixedly sleeved on the umbrella rod, the return spring is connected between the activating tube and the mounting tube, an annular cavity is formed between the inner wall of one end of the mounting tube and the outer wall of the umbrella rod, a through hole is formed in the side wall of the mounting tube corresponding to the annular cavity, the locking rod is slidably connected with the mounting tube through the through hole, and one end of the activating tube can be inserted into the annular cavity and push the locking rod out of the mounting tube.

[0012] In an embodiment, one end of the activating tube has a chamfered region, and the end of the locking rod is in a dome shape.

[0013] In an embodiment, the unfolding member comprises a seat and at least one pawl, the seat is fixedly connected with the umbrella rod, an annular insertion hole is formed between the seat and the umbrella rod, the pawl is rotatably connected with the seat, when one end of the pawl extends into the annular insertion hole and abuts against the other end of the activating tube, the pawl is pushed to rotate by the return spring to move the activating tube relative to the umbrella rod and push the pawl to rotate for unfolding.

[0014] In an embodiment, the umbrella stand comprises a first pushing sleeve, a second pushing sleeve, a supporting pushing sleeve, a plurality of first ribs and a plurality of second ribs, the first pushing sleeve is fixedly connected with the umbrella rod, the second pushing sleeve and the supporting pushing sleeve are slidably sleeved on the umbrella rod, the plurality of first ribs are connected between the first pushing sleeve and the second pushing sleeve, and each of the first ribs is connected with a second rib between the supporting pushing sleeve, and the canopy is fixedly connected with the plurality of second ribs.

[0015] In an embodiment, an open-ended limiting cavity is formed between the second pushing sleeve and the umbrella rod, and the inner diameter of the opening is smaller than the inner diameter of the limiting cavity, when the mounting tube is inserted into the limiting cavity, the locking rod can be inserted into the limiting cavity to lock the umbrella stand.

[0016] In an embodiment, a reverse tooth mechanism is further included, the reverse tooth mechanism is connected with the second pushing sleeve, and the reverse tooth mechanism is used to limit the movement of the second pushing sleeve towards the seat.

[0017] In an embodiment, the reverse tooth mechanism comprises a mounting seat and a clasp, the mounting seat is fixedly connected with the second pushing sleeve and sleeved on the umbrella rod, a cavity is formed between the mounting seat and the umbrella rod, the inner diameter of one end of the cavity away from the seat gradually decreases, the clasp is arranged in the cavity and sleeved on the umbrella rod, and the outer diameter of one end of the clasp away from the seat also gradually decreases, a plurality of reverse teeth are arranged in the clasp, a plurality of inclined teeth are arranged on the umbrella rod along the length direction, and the reverse teeth can be engaged with the inclined teeth to limit the movement of the second pushing sleeve towards the seat.

[0018] In an embodiment, the elastic member is a compression spring, one end of the compression spring is fixedly connected with the base, and the other end of the compression spring is fixedly connected with the second push sleeve.

[0019] In an embodiment, the other end of the umbrella rod is connected with a skin bowl mechanism.

[0020] Compared with the prior art, the over-drill rod cement umbrella provided by the utility model is connected with the umbrella frame through the umbrella surface, at least one pawl is hingedly connected on the seat body, the seat body is fixedly connected with one end of the umbrella rod, the unlocking member is connected with the umbrella rod, and the elastic member is connected between the seat body and the umbrella frame, when the pawl is separated from the hole wall of the drill rod, the unlocking member can drive the pawl to rotate and separate from the umbrella frame, and the elastic member can push the umbrella frame to open the umbrella surface to realize automatic umbrella opening,

[0021] The umbrella surface is opened to form a barrier, cement and other materials are poured into the wellbore, the umbrella cloth can isolate underground water and help the cement to be shaped to avoid collapse and form a stable cement plug. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure schematic view of the over-drill rod cement umbrella in an activated state provided by the utility model embodiment;

[0023] Figure 2 is a structure schematic view of the over-drill rod cement umbrella in an unactivated state provided by the utility model embodiment;

[0024] Figure 3 is a partial sectional view of the over-drill rod cement umbrella in the unactivated state provided by the utility model embodiment;

[0025] Figure 4 is Figure 3 an enlarged schematic view of the A area in FIG.

[0026] Figure 5 is Figure 3 an enlarged schematic view of the B area in FIG.

[0027] Figure 6 is a partial sectional view of the over-drill rod cement umbrella in the activated state provided by the utility model embodiment;

[0028] Figure 7 is Figure 6 an enlarged schematic view of the C area in FIG.

[0029] Figure 8 is Figure 6 an enlarged schematic view of the D area in FIG. DETAILED DESCRIPTION

[0030] In order to make the utility model purposes, technical scheme and advantages more clearly, the following will be further described in detail with the drawings and examples.

[0031] In order to solve the technical problem that the cement umbrella cannot be automatically opened after sliding out of the drill pipe, the utility model provides a cement umbrella through drill pipe, which can realize that the umbrella surface of the cement umbrella can be completely automatically opened after the cement umbrella slides out of the drill pipe.

[0032] Please refer to Figures 1-8 , Figures 1-8 For the cement umbrella through drill pipe in the utility model embodiment, it comprises an umbrella mechanism 1, an unfolding part 2, an elastic part 3 and an activating part 4, the umbrella mechanism 1 comprises an umbrella rod 11, an umbrella frame 12 and an umbrella surface 13, the umbrella frame 12 is connected with the umbrella rod 11, and the umbrella surface 13 is connected with the umbrella frame 12; the unfolding part 2 is fixedly connected with the umbrella rod 11; the elastic part 3 is connected between the umbrella frame 12 and the unfolding part 2; the activating part 4 is connected with the umbrella rod 11, when one end of the activating part 4 abuts against the unfolding part 2 and the other end locks the umbrella frame 12, the unfolding part 2 is not subjected to external force, the activating part 4 can drive the unfolding part 2 to unfold and release the umbrella frame 12, and the elastic part 3 can drive the umbrella frame 12 to move relative to the umbrella rod 11 to open the umbrella surface 13.

[0033] In actual use, the cement umbrella is installed in the drill pipe and is installed to a specified well depth position through a downhole tool, then the cement umbrella is stretched and fixed in a larger size casing or wellbore to create a bottom support of cement, separates the cement slurry from the well bottom liquid, and avoids cement slurry replacement and excessive mixing of slurry.

[0034] In the specific embodiment, the umbrella frame 12 comprises a first pushing sleeve 121, a second pushing sleeve 122, a supporting pushing sleeve 123, a plurality of first umbrella ribs 124 and a plurality of second umbrella ribs 125, the first pushing sleeve 121 is fixedly connected with the umbrella rod 11, the second pushing sleeve 122 and the supporting pushing sleeve 123 are both slidingly connected with the umbrella rod 11, a plurality of the first umbrella ribs 124 are connected between the first pushing sleeve 121 and the second pushing sleeve 122, and each of the first umbrella ribs 124 is connected with the second umbrella rib 125 between the supporting pushing sleeve 123, and the umbrella surface 13 is fixedly connected with the plurality of second umbrella ribs 125.

[0035] Specifically, the activating part 4 is not limited to a specific structure, as long as it can automatically unlock the umbrella mechanism, and other redundant descriptions are not made here.

[0036] In an embodiment, the activating member 4 comprises an activating tube 41, a mounting tube 42, a restoring spring 43, and at least one locking rod 44. The activating tube 41 is sleeved on the umbrella rod 11. The mounting tube 42 is fixedly sleeved on the umbrella rod 11. The restoring spring 43 is connected between the activating tube 41 and the mounting tube 42. An annular cavity is formed between the inner wall of one end of the mounting tube 42 and the outer wall of the umbrella rod 11. A through hole is formed in the side wall of the mounting tube 42 corresponding to the annular cavity. The locking rod 44 is slidably connected with the mounting tube 42 through the through hole. One end of the activating tube 41 can be arranged in the annular cavity and push the locking rod 44 out of the mounting tube 42.

[0037] In an embodiment, one end of the activating tube 41 has a chamfered region, and the end of the locking rod 44 is in a dome shape.

[0038] In an embodiment, the unfolding member 2 comprises a seat body 21 and at least one pawl 22. The seat body 21 is fixedly connected with the umbrella rod 11. An annular insertion hole is formed between the seat body 21 and the umbrella rod 11. The pawl 22 is rotatably connected with the seat body 21. When one end of the pawl 22 extends to the annular insertion hole and abuts against the other end of the activating tube 41, the pawl 22 is not rotated under the action of external force. The restoring spring 43 can push the activating tube 41 to move relative to the umbrella rod 11 and push the pawl 22 to rotate for unfolding.

[0039] Specifically, when the seat body 21 is arranged in the drill rod, the pawl 22 is in sliding contact with the inner hole wall of the drill rod, and the pawl 22 cannot rotate, so that the cement umbrella is kept in an inactivated state.

[0040] In addition, in the inactivated state, the other end of the activating tube 41 extends into the annular insertion hole and abuts against the pawl 22. The other end is arranged in the annular cavity. The restoring spring 43 is compressed between the activating tube 41 and the mounting tube 42. The end of the locking rod 44 is arranged outside the mounting tube 42 and locks the umbrella stand.

[0041] In an embodiment, the umbrella stand 12 comprises a first pushing sleeve 121, a second pushing sleeve 122, a supporting pushing sleeve 123, a plurality of first ribs 124, and a plurality of second ribs 125. The first pushing sleeve 121 is fixedly connected with the umbrella rod 11. The second pushing sleeve 122 and the supporting pushing sleeve 123 are slidably connected with the umbrella rod 11. The plurality of first ribs 124 are connected between the first pushing sleeve 121 and the second pushing sleeve 122. The second rib 125 is connected between each first rib 124 and the supporting pushing sleeve 123. The umbrella canopy 13 is fixedly connected with the plurality of second ribs 125.

[0042] Need explaining, the second push cover 122 and the umbrella rod 11 between the enclosing formation has one end open limit cavity, and the opening inner diameter is less than the inner diameter of the limit cavity, when the installation pipe 42 is worn in the limit cavity, the lock rod 44 can be worn in the limit cavity to lock the umbrella stand 12.

[0043] On the basis of the above-mentioned scheme, in order to avoid the reverse sliding of the second push cover 122, specifically, the reverse tooth mechanism 5 is arranged on the second push cover 122, and the reverse tooth mechanism 5 is matched with the plurality of inclined teeth arranged on the umbrella rod, so that the movement of the second push cover 122 towards the seat body 21 is limited.

[0044] Need explaining, the reverse tooth mechanism 3 is not limited to a certain specific structure, as long as it can be engaged with the plurality of inclined teeth arranged on the umbrella rod, and the reverse sliding of the second push cover 122 is avoided, and other redundant descriptions are not made here.

[0045] In the embodiment, the reverse tooth mechanism 5 includes a mounting seat 51 and a clasp 52, the mounting seat 51 is fixedly connected with the second push cover 122 and is sleeved on the umbrella rod 11, and a cavity is formed between the mounting seat 51 and the umbrella rod 11, and the inner diameter of the cavity gradually decreases away from the seat body 21, the clasp 52 is arranged in the cavity and is sleeved on the umbrella rod 11, and the outer diameter of the clasp 52 gradually decreases away from the seat body 21, a plurality of reverse teeth are arranged in the clasp 52, a plurality of inclined teeth are arranged on the umbrella rod 11 along the length direction, and the reverse teeth can be engaged with the inclined teeth to limit the movement of the second push cover 122 towards the seat body 21.

[0046] On the basis of the above-mentioned scheme, the other end of the umbrella rod 11 is connected with a leather bowl mechanism 6, and it should be noted that the leather bowl mechanism 6 is not limited to a certain specific structure, the leather bowl mechanism 6 includes a leather bowl, a guide head fixedly arranged at one end of the leather bowl, and a connecting rod fixedly arranged at the other end of the leather bowl, and the connecting rod is fixedly connected with the other end of the umbrella rod, specifically, the leather bowl is a key sealing element, which is usually made of elastic materials such as rubber, and has good sealing performance and wear resistance.

[0047] In order to better understand the present application, the following is combined with Figures 1-8 The technical scheme of the present application is described in detail.

[0048] The cement umbrella is installed in the drill pipe and is installed to the designated well depth position through the downhole tool, when the pawl 22 is separated from the hole wall of the drill pipe, the activation tube 41 slides relative to the umbrella rod under the driving force of the restoring spring 43, the other end of the activation tube 41 can push the pawl 22 to rotate, the pawl 22 is unlocked after rotating a certain angle, the pawl 22 is unlocked to the activation tube 41; at the same time, the second push sleeve 122 slides relative to the umbrella rod under the elastic force of the elastic member 3, the open end of the second push sleeve 122 can extrude the end of the lock rod, the lock rod slides, the lock rod can retract into the installation tube, the end of the second push sleeve 122 is not blocked, the second push sleeve 122 and the installation tube 42 can slide and separate, the second push sleeve 122 and the first push sleeve 121 are close to each other, the umbrella can be opened, when the reverse tooth in the snap ring 52 is engaged with the inclined tooth on the umbrella rod, the second push sleeve 122 can be limited to slide towards the seat body.

[0049] The specific implementation manner of the utility model does not constitute the limitation to the protection scope of the utility model. Any various other corresponding changes and deformation according to the technical concept of the utility model should be contained in the protection scope of the utility model claim.

Claims

1. A cement umbrella for drilling rods, characterized in that, include: An umbrella mechanism, comprising an umbrella pole, an umbrella frame, and an umbrella canopy, wherein the umbrella frame is connected to the umbrella pole and the umbrella canopy is connected to the umbrella frame; An unfolding component, which is fixedly connected to the umbrella pole; An elastic element, said elastic element connecting the umbrella frame and the unfolding component; and, An activator, connected to the umbrella pole, when one end of the activator abuts against the unfolding component and the other end locks the umbrella frame, the activator can drive the unfolding component to unfold and release the umbrella frame without external force. The elastic element can drive the umbrella frame to move relative to the umbrella pole to open the umbrella canopy.

2. The cement umbrella through the drill rod according to claim 1, characterized in that, The activation component includes an activation tube, a mounting tube, a return spring, and at least one locking rod. The activation tube is slidably sleeved on the umbrella pole, the mounting tube is fixedly sleeved on the umbrella pole, and the return spring is connected between the activation tube and the mounting tube. An annular cavity is formed between the inner wall of one end of the mounting tube and the outer wall of the umbrella pole. A through hole is opened on the side wall of the mounting tube corresponding to the annular cavity. The locking rod is slidably connected to the mounting tube through the through hole. One end of the activation tube can pass through the annular cavity and push the locking rod out to the outside of the mounting tube.

3. The cement umbrella through the drill rod according to claim 2, characterized in that, One end of the activation tube has a chamfered area, and the end of the locking rod is dome-shaped.

4. The cement umbrella through the drill rod according to claim 2, characterized in that, The unfolding component includes a base and at least one pawl. The base is fixedly connected to the umbrella pole, and an annular insertion hole is formed between the base and the umbrella pole. The pawl is rotatably connected to the base. When one end of the pawl extends to the annular insertion hole and abuts against the other end of the activation tube, the return spring can push the activation tube to move relative to the umbrella pole and push the pawl to rotate for unfolding when the pawl is not subjected to external force.

5. A cement umbrella for drilling rods according to claim 4, characterized in that, The umbrella frame includes a first push sleeve, a second push sleeve, a supporting push sleeve, multiple first umbrella ribs, and multiple second umbrella ribs. The first push sleeve is fixedly connected to the umbrella pole, and the second push sleeve and the supporting push sleeve are slidably connected to the umbrella pole. Multiple first umbrella ribs are connected between the first push sleeve and the second push sleeve, and each first umbrella rib is connected to the supporting push sleeve by a second umbrella rib. The umbrella canopy is fixedly connected to the multiple second umbrella ribs.

6. A cement umbrella for drilling rods according to claim 5, characterized in that, The second push sleeve and the umbrella rod form a limiting cavity with one end open, and the inner diameter of the opening is smaller than the inner diameter of the limiting cavity. When the mounting tube is inserted into the limiting cavity, the locking rod can be inserted into the limiting cavity to lock the umbrella frame.

7. A cement umbrella for drilling rods according to claim 5, characterized in that, It also includes a toothed mechanism, which is connected to the second push sleeve and is used to restrict the movement of the second push sleeve toward the seat.

8. A cement umbrella for drilling rods according to claim 7, characterized in that, The reverse tooth mechanism includes a mounting base and a retaining ring. The mounting base is fixedly connected to the second push sleeve and sleeved on the umbrella shaft. A cavity is formed between the mounting base and the umbrella shaft, and the inner diameter of the cavity gradually decreases at the end away from the base. The retaining ring is disposed in the cavity and sleeved on the umbrella shaft, and the outer diameter of the retaining ring at the end away from the base also gradually decreases. The retaining ring has multiple reverse teeth, and the umbrella shaft has multiple oblique teeth spaced along its length. The reverse teeth can mesh with the oblique teeth to restrict the movement of the second push sleeve toward the base.

9. A cement umbrella for drilling rods according to claim 2, characterized in that, The elastic element is a compression spring, which is sleeved on the umbrella rod. One end of the compression spring is fixedly connected to the base, and the other end of the compression spring is fixedly connected to the second push sleeve.

10. A cement umbrella for drilling rods according to any one of claims 1-9, characterized in that, The other end of the umbrella pole is connected to a leather cup mechanism.

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