Oil pipe casing coupling with righting function

Abstract

The utility model relates to the technical field of pipe fitting connection, in particular to an oil pipe casing coupling with a righting function. Comprising a coupling body, a plurality of sliding grooves are formed in the outer edge of the coupling body, the length direction of the sliding grooves is parallel to the axial direction of the coupling body, sliding blocks are clamped in the sliding grooves in a sliding mode, clamping blocks are clamped in the sliding grooves above the sliding blocks, the clamping blocks are detachably and fixedly connected with the coupling body, the sliding blocks are connected with the clamping blocks through springs, and the lower ends of elastic pieces are fixed in the lower ends of the sliding grooves. The upper ends of the elastic pieces are fixedly connected with the lower ends of the sliding blocks. The middles of the elastic pieces protrude towards the outer side of the coupling body in an arc mode. And through the matched design of the sliding clamping block and the spring, the pre-tightening force of the elastic piece can be adjusted in real time according to the well condition. After the upper locking screw is unscrewed, the sliding clamping block can change the compression amount of the spring, and therefore the supporting strength of the elastic piece is adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pipe fitting connection technical field, concretely relates to a casing pipe coupling with righting function. BACKGROUND

[0002] With the continuous progress of oil and gas well development technology, high-deviation wells and horizontal wells are applied more and more, especially in recent years, shale oil and gas development wells are more and more, when the shale oil and gas well completion operation represented by Sichuan Basin is carried out, because the oil and gas production layer is mostly high-deviation well or horizontal wellbore, the cementing difficulty is very large, in order to improve the cementing quality, the casing centralizer must be used to ensure the centralization of the casing string in the wellbore when the casing is lowered.

[0003] In the casing of high-deviation well or horizontal well, although the rigid centralizer can play a good role in righting the casing, the outer diameter of the rigid centralizer is too large and has no elasticity and cannot be contracted, the friction in the high-deviation well or horizontal well is too large, especially when the well wall has a reduced diameter, resistance is often encountered, so that the casing cannot be smoothly lowered into place. The outer diameter of the elastic centralizer can be expanded and contracted, and it can pass through a certain reduced diameter well section. However, when the shale oil and gas well is constructed, the conventional centralizer is fixed on the casing by a stop ring, because the annular gap is usually small, the force acting on the centralizer is large, the stop ring often moves, causing the position of the centralizer to change, which leads to the problem that the perforation is often on the centralizer during the later perforation construction, affecting the construction quality.

[0004] The patent document with publication number CN212225132U discloses a casing coupling with righting function, which comprises a coupling body, a plurality of righting devices are uniformly arranged on the outer edge of the coupling body, in the technical scheme, the coupling body is connected with the casing and lowered into the wellbore, during the casing lowering process, when passing through the blocked section, the middle part of the elastic plate moves towards the coupling body, the elastic plate tends to be flat, thereby enabling the coupling body to smoothly pass through the blocked section, when the elastic plate tends to be flat, the sliding block slides upward in the sliding groove, the upper spring above the sliding block is compressed, the top block extrudes the lower spring to move towards the first blind hole, the top block can stabilize the elastic plate when it moves to prevent the elastic plate from being damaged due to deflection when rotating, when the upper part of the elastic plate contacts the blocked point during the casing lifting, under the elastic force of the upper spring below the sliding block, the sliding block is prevented from descending to increase the curvature of the elastic plate, thereby reducing the passing performance of the coupling body, the upper spring below the sliding block can buffer the force acting on the upper part of the elastic plate, thereby effectively protecting the elastic plate. The technical scheme has a relatively complex structure and high production cost.

[0005] The patent document with the publication number CN215565783U discloses a centralizing casing coupling, which comprises a coupling body for connecting two adjacent casings, a plurality of installation grooves are formed in the coupling body, the length direction of the installation grooves is consistent with the length direction of the coupling body, and the installation grooves are arranged on the outer side wall of the coupling body in a circumferential direction; a plurality of spring pieces are respectively installed in the installation grooves, the spring pieces are arc-shaped, the front end of the spring piece is fixedly connected in the installation groove, and the rear end of the spring piece is attached to the bottom surface of the installation groove and slides along the length direction of the installation groove. A plurality of spring pieces with a centralizing effect are radially arranged on the outer side of the coupling body, which solves the problem of casing downhole resistance caused by the rigidity of the centralizer without elasticity and contraction; and the spring pieces are fixed on the coupling body, so that the centralizer does not need to be assisted by a stop ring, and problems such as movement of the centralizer and influence on subsequent perforation construction caused by unstable fixation of the stop ring are avoided. However, the technical scheme cannot adjust the compression resistance of the spring piece according to the well condition, and the application range is small. Utility model content

[0006] The main purpose of the utility model is to provide a tubing casing coupling which can reduce production cost, adjust the compression resistance of the elastic piece according to the well condition, ensure the passability, and improve the centralizing effect.

[0007] In order to achieve the above purpose, the technical scheme provided by the utility model is:

[0008] A tubing casing coupling with a centralizing function, which comprises a coupling body, a plurality of sliding grooves are formed in the outer edge of the coupling body, the length direction of the sliding grooves is parallel to the axial direction of the coupling body, a sliding block is slidably connected in the sliding groove, a clamping block is connected above the sliding block, the clamping block is detachably connected with the coupling body, the sliding block and the clamping block are connected through a spring, the lower end of an elastic piece is fixed in the lower end of the sliding groove, the upper end of the elastic piece is fixedly connected with the lower end of the sliding block, and the middle part of the elastic piece is arc-shapedly protruded to the outside of the coupling body.

[0009] Specifically, a plurality of flow grooves are formed in the outer edge of the coupling body, and the length direction of the flow grooves is parallel to the axial direction of the coupling body.

[0010] Specifically, a locking screw is threadedly connected to the clamping block, the locking screw is tightly connected with the coupling body, the locking screw is loosened, and the clamping block can slide in the sliding groove.

[0011] Specifically, the sliding groove is a dovetail groove, and the sliding block and the clamping block are dovetail blocks.

[0012] Specifically, the lower end of the elastic piece is fixed in the sliding groove through a lower locking screw.

[0013] Specifically, internal threads are formed in the upper and lower ends of the coupling body.

[0014] Specifically, the elastic sheet is sprayed with a wear-resistant coating towards the side of the coupling body outside.

[0015] Specifically, the plurality of flow grooves are arranged according to the circumference of the axis of the coupling body, and the plurality of sliding grooves are arranged according to the circumference of the axis of the coupling body.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] 1. Through the cooperation of the sliding clamping block and the spring, the pre-tightening force of the elastic sheet can be adjusted in real time according to the well condition. After the upper locking screw is loosened, the sliding clamping block can change the spring compression amount, so that the supporting strength of the elastic sheet is adjusted. When the well condition is complex, the compression resistance is improved, and the passability is optimized under normal conditions. Through the dynamic adjustment mechanism of the clamping block, the limitation of the fixed pre-tightening force of the traditional coupling centralizer is broken, and the adaptability to different wellbore environments is significantly improved.

[0018] 2. The dovetail cooperation structure of the sliding block, the clamping block and the sliding groove replaces the traditional multi-stage linkage device, ensures the mechanical stability and simplifies the assembly process. The elastic sheet is directly fixed through the lower locking screw, and the additional stop ring or complex limiting component is omitted, so that the number of parts and the production cost are reduced, and the downhole failure risk is also reduced.

[0019] 3. The outer side of the elastic sheet is sprayed with a tungsten carbide / nickel-based alloy wear-resistant coating, which effectively resists the erosion and wear of the sand and rock cuttings in the well. Combined with the arc convex design of the elastic sheet, the service life of the elastic sheet is prolonged while providing stable centralizing force, and the maintenance operation caused by wear is reduced.

[0020] 4. The axial flow grooves are arranged on the outer edge of the coupling body, and a mud circulation channel is formed. This design can improve the flow path of the cement slurry during cementing, avoid the slurry retention caused by the smooth surface of the coupling body, improve the uniformity of the cement sheath distribution, and ensure the cementing quality.

[0021] 5. The upper locking screw and the dovetail groove structure form double fixation, the upper locking screw provides radial locking force, and the dovetail cooperation prevents horizontal displacement. This design allows smooth sliding in the adjustment stage, resists complex loads in the well after locking, prevents pre-tightening force failure caused by displacement of the clamping block, and ensures that the elastic sheet is in the optimal working state for a long time.

[0022] 6. The elastic sheet is convenient to replace, and the maintenance cost of the coupling is low. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The utility model discloses a schematic diagram.

[0024] Figure 2 is Figure 1Enlarged view of the middle B region.

[0025] Figure 3 The top view of the utility model.

[0026] Figure 4 The Figure 3 The middle A-A sectional view.

[0027] Figure 5 The Figure 4 Enlarged view of the middle C region.

[0028] The names of parts in the drawings are: 1, coupling body, 2, flow groove, 3, sliding groove, 4, clamping block, 5, sliding block, 6, spring, 7, upper locking screw, 8, elastic sheet, 9, lower locking screw. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0030] Embodiment one: refer to Figures 1-5 As shown in the figure, a tubing casing coupling with a righting function, comprising a coupling body 1, the upper and lower ends of the coupling body 1 are both machined with internal threads.

[0031] A plurality of flow grooves 2 are provided on the outer edge of the coupling body 1, the length direction of the flow grooves 2 is parallel to the axial direction of the coupling body 1, and the plurality of flow grooves 2 are arranged according to the circumference of the axis of the coupling body 1. The flow grooves 2 can form a mud circulation channel, which can improve the cement slurry flow path during well cementing, avoid slurry retention due to the smooth surface of the coupling body 1, and thus improve the uniformity of the cement sheath distribution and ensure well cementing quality.

[0032] A plurality of sliding grooves 3 are provided on the outer edge of the coupling body 1, and the plurality of sliding grooves 3 are arranged according to the circumference of the axis of the coupling body 1. The length direction of the sliding grooves 3 is parallel to the axial direction of the coupling body 1. A sliding block 5 is detachably connected in the sliding groove 3, a clamping block 4 is detachably connected in the sliding groove 3 above the sliding block 5, and the clamping block 4 is detachably connected with the coupling body 1. Specifically, the sliding groove 3 is a dovetail groove, and the sliding block 5 and the clamping block 4 are both dovetail blocks. An upper locking screw 7 is threadedly connected to the clamping block 4, the upper locking screw 7 abuts against the coupling body 1, and the clamping block 4 can slide in the sliding groove 3 by loosening the upper locking screw 7.

[0033] The sliding block 5 and the clamping block 4 are connected by a spring 6, and the lower end of an elastic sheet 8 is fixed in the sliding groove 3 by a lower locking screw 9. The upper end of the elastic sheet 8 is fixedly connected with the lower end of the sliding block 5, and the middle part of the elastic sheet 8 is arc-shapedly protruded outwardly of the coupling body 1.

[0034] In the embodiment, when the well condition is poor, the upper locking screw 7 can be loosened, so that the clamping block 4 is lowered to compress the spring 6 and is close to the sliding block 5, and then the compression resistance of the elastic sheet 8 is adjusted. When the elastic sheet 8 encounters a jamming point, the compression resistance of the elastic sheet 8 can be improved, so that the casing body 1 is prevented from contacting the jamming point and hindering the movement of the pipe string.

[0035] Through the dynamic adjustment mechanism of the clamping block 4, the limitation of the traditional coupling centralizer is broken, and the adaptability to different wellbore environments is significantly improved.

[0036] In the embodiment, the side of the elastic sheet 8 facing the outside of the coupling body 1 is sprayed with a wear-resistant coating.

[0037] The wear-resistant coating in the embodiment is a tungsten carbide layer or a nickel-based alloy layer.

[0038] Through spraying the wear-resistant coating on the side of the elastic sheet 8 facing the outside of the coupling body 1, the erosion and wear of the sand and rock cuttings in the well can be effectively resisted. Combined with the arc convex design of the elastic sheet 8, the service life of the elastic sheet 8 is prolonged while the stable centralizing force is provided, and the maintenance operation caused by wear is reduced.

[0039] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A tubing casing coupling with a straightening function, comprising a coupling body (1), characterized in that, Multiple grooves (3) are provided on the outer edge of the coupling body (1). The length direction of the grooves (3) is parallel to the axial direction of the coupling body (1). A slider (5) is slidably engaged in the groove (3). A locking block (4) is engaged in the groove (3) above the slider (5). The locking block (4) is detachably and fixedly connected to the coupling body (1). The slider (5) and the locking block (4) are connected by a spring (6). The lower end of the elastic plate (8) is fixed in the lower end of the groove (3). The upper end of the elastic plate (8) is fixedly connected to the lower end of the slider (5). The middle part of the elastic plate (8) protrudes arc-shaped outward from the coupling body (1).

2. The tubing sleeve coupling with a straightening function according to claim 1, characterized in that, The outer edge of the coupling body (1) is provided with a plurality of flow grooves (2), and the length direction of the flow grooves (2) is parallel to the axial direction of the coupling body (1).

3. The tubing casing coupling with a straightening function according to claim 1, characterized in that, The locking block (4) is threaded with an upper locking screw (7), which abuts against the coupling body (1). When the upper locking screw (7) is loosened, the locking block (4) can slide in the slide groove (3).

4. The tubing casing coupling with a straightening function according to claim 1, characterized in that, The slide (3) is a dovetail groove, and the slider (5) and the locking block (4) are both dovetail blocks.

5. The tubing casing coupling with a straightening function according to claim 1, characterized in that, The lower end of the elastic sheet (8) is fixed in the groove (3) by a lower locking screw (9).

6. The tubing casing coupling with a straightening function according to claim 1, characterized in that, The coupling body (1) has internal threads machined at both its upper and lower ends.

7. The tubing casing coupling with a straightening function according to claim 1, characterized in that, The elastic sheet (8) is coated with a wear-resistant coating on the side facing the outside of the coupling body (1).

8. The tubing casing coupling with a straightening function according to claim 2, characterized in that, The multiple flow channels (2) are evenly distributed around the axial center of the coupling body (1), and the multiple sliding grooves (3) are evenly distributed around the axial center of the coupling body (1).

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