Temporary plugging cone structure

Abstract

The utility model relates to the technical field of oil and gas downhole tools, in particular to a temporary plugging cone structure which comprises a metal piece and a rubber layer covering the metal piece, the rubber layer and the metal piece are both of a double-end conical structure, and each of the rubber layer and the metal piece comprises an end portion, a cone portion and a waist portion which are sequentially connected. The size of the maximum position of the waist portion of the metal piece in the width direction is 12-25 mm, the size of the minimum position of the conical portion of the metal piece is 2-5 mm, the angle of the conical portion of the metal piece is 43-55 degrees, the angle of the conical portion of the rubber layer is 65-75 degrees, and the thickness of the rubber layer is 2.5-6 mm. After the technical scheme is adopted, the forming difficulty and cost of the temporary plugging cone are reduced, and the temporary plugging cone can adapt to tight plugging of irregular holes with different sizes.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas downhole tool technical field, concretely relates to a kind of temporary plugging cone structures. BACKGROUND

[0002] Fracturing technology has been widely used in oil and gas exploitation, before fracturing operation, the casing is plugged and the fracturing section is perforated, after forming the hole on the casing, the fracturing fluid and proppant enter the fracturing section through the hole for the first stage fracturing, after stopping the pump, a certain amount of temporary plugging piece is put into the fracturing section to temporarily plug the hole, and then the pump is continued to be opened for fracturing.

[0003] After continuing to open the pump, the fracturing fluid and proppant will flow to the fracture and hole with better first stage fracturing effect through the hole, and the temporary plugging piece will also flow to the hole with the fracturing fluid and proppant to plug the hole and the fracture with better fracturing effect, and during the process of continuing to fracture, the fracturing fluid and proppant are transferred to the hole or fracture that has not been fractured, thereby shortening the length of the main fracture and preventing the possibility of pressure channeling with adjacent wells.

[0004] Currently, the degradable rope knot woven by fibers is commonly used as a temporary plugging piece, but there are problems of complex weaving of the rope knot and dissolution performance, and the cost is high due to the raw materials, and it is difficult to withstand high construction pressure. UTILITY MODEL CONTENTS

[0005] The utility model intends to provide a temporary plugging cone structure to reduce the forming difficulty of the temporary plugging piece and improve the pressure-bearing capacity.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a temporary plugging cone structure includes a metal piece and a rubber layer covering the metal piece, the rubber layer and the metal piece are both double-end conical structures, and the rubber layer and the metal piece both include an end portion, a taper portion and a waist portion connected in sequence, the maximum width of the waist portion of the metal piece is 12-25mm, the minimum size of the taper portion of the metal piece is 2-5mm, the angle of the taper portion of the metal piece is 43-55°, the angle of the taper portion of the rubber layer is 65-75°, and the thickness of the rubber layer is 2.5-6mm.

[0007] The technical effect of the scheme is that the temporary plugging cone is formed by vulcanizing the metal part through a mold, and the forming is simple and can be mass-produced, thereby reducing the forming difficulty and cost of the temporary plugging cone; the temporary plugging cone is designed as a double-head conical shape through the design of relevant parameters, so that it can easily enter the hole, and the outer diameter from small to large is a changeable size, which can adapt to holes of different sizes at one time; meanwhile, the metal part is fully utilized to ensure the performance of bearing high pressure of up to 105MPa, the outer rubber layer has a certain flexibility, and good plastic deformation can effectively plug irregular holes to ensure tight sealing; the metal part and the rubber layer cooperate to be tighter and more airtight under pressure, thereby preventing the entry of fracturing fluid and proppant.

[0008] Preferably, as an improvement, the size of the maximum position of the waist width direction of the metal part is 18.4mm, the size of the minimum position of the taper part of the metal part is 2.7mm, the angle of the taper part of the metal part is 48.4°, and the angle of the taper part of the rubber layer is 69.7°.

[0009] Preferably, as an improvement, the thickness of the rubber layer is uniformly set or gradually reduced from the waist to the end.

[0010] Preferably, as an improvement, the end and the waist are both circular arc transition positions.

[0011] Preferably, as an improvement, the metal part is a soluble magnesium alloy.

[0012] Preferably, as an improvement, the metal part is an aluminum alloy.

[0013] The technical effect of the scheme is that the aluminum alloy dissolves slowly, and the aluminum alloy can be recycled when the fracturing fluid is discharged.

[0014] Preferably, as an improvement, it further comprises a slow-dissolving shell between the metal part and the rubber layer, the slow-dissolving shell comprises two half shells clamped together, the metal part is wrapped in the slow-dissolving shell, and the rubber layer covers the slow-dissolving shell.

[0015] The technical effect of the scheme is that for manufacturers who have soluble magnesium alloy in stock, in order to reduce the dissolution of the metal part in the stratum, a slow-dissolving shell is arranged outside the metal part, and the metal part can be recycled and reused.

[0016] Preferably, as an improvement, the two half shells are clamped from the length or width direction of the metal part.

[0017] The technical effect of the scheme is that for the case that the thickness of the rubber layer gradually decreases from the waist part to the end part, the two half shells are clamped from the length direction of the metal piece, the clamping position is located at the waist part, the dissolution time of the rubber layer at the waist part is longer than that of the rubber layer at the end part, and the rubber layer wrapping the clamping position can reduce the probability of the fracturing fluid entering the slow-dissolution shell to dissolve the soluble magnesium alloy, thereby ensuring the complete recovery of the metal piece.

[0018] Preferably, as an improvement, one of the half shells is provided with a clamping ring, the other half shell is provided with a clamping groove matched with the clamping ring, and the end of the clamping ring and the bottom of the clamping groove are provided with concave-convex parts matched with each other.

[0019] The technical effect of the scheme is that the matching of the concave-convex parts can increase the difficulty of the fracturing fluid penetrating into the slow-dissolution shell.

[0020] Preferably, as an improvement, the slow-dissolution shell is an aluminum alloy shell. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure schematic view of the embodiment 1 of the utility model;

[0022] Figure 2 It is a structure schematic view of the embodiment 2 of the utility model;

[0023] Figure 3 It is a structure schematic view of the embodiment 3 of the utility model. Figure 2

[0024] Figure 4 It is a structure schematic view of the embodiment 3 of the utility model. DETAILED DESCRIPTION

[0025] The following will be further explained in detail through specific embodiments:

[0026] The reference signs in the drawings of the specification include: metal piece 1, rubber layer 2, end part 3, taper part 4, waist part 5, slow-dissolution shell 6, clamping ring 7, concave-convex part 8.

[0027] Embodiment 1

[0028] Embodiment 1 is basically as shown in the drawings: a temporary plugging taper structure, comprising a metal piece 1 and a rubber layer 2, that is, the metal piece 1 is vulcanized by soluble rubber, and the rubber layer 2 covers the metal piece 1, the metal piece 1 of the embodiment is a soluble magnesium alloy, that is, a rare metal, such as a lanthanide metal, is added to the magnesium alloy. Figure 1

[0029] ​​The rubber layer 2 and the metal piece 1 are both double-head conical structures, and both the rubber layer 2 and the metal piece 1 comprise an integrally formed end portion 3, a conical portion 4 and a waist portion 5, the end portion 3 and the waist portion 5 are both circular arc transition positions, and the circular arc of the end portion 3 and the circular arc of the waist portion 5 are connected by a straight line of the conical portion 4.

[0030] Figure 1 The maximum dimension of the waist portion 5 of the metal piece 1 in the width direction is 12-25mm, the minimum dimension of the conical portion 4 of the metal piece 1 is 2-5mm, the angle of the conical portion 4 of the metal piece 1 is 43-55°, the angle of the conical portion 4 of the rubber layer 2 is 65-75°, and the thickness of the rubber layer 2 is 2.5-6mm.

[0031] Specifically, as shown in Figure 1 , the maximum dimension of the waist portion 5 of the metal piece 1 in the width direction is 18.4mm, the minimum dimension of the conical portion 4 of the metal piece 1 is 2.7mm, the angle of the conical portion 4 of the metal piece 1 is 48.4°, and the angle of the conical portion 4 of the rubber layer 2 is 69.7°.

[0032] The thickness of the rubber layer 2 is uniformly set or gradually reduced from the waist portion 5 to the end portion 3, Figure 1 and the gradually reduced schematic view is shown.

[0033] Embodiment 2

[0034] Based on the embodiment 1, as shown in Figure 2 , the embodiment further comprises a slow-dissolving shell 6 between the metal piece 1 and the rubber layer 2, the metal piece 1 is wrapped in the slow-dissolving shell 6, and the rubber layer 2 covers the slow-dissolving shell 6.

[0035] The slow-dissolving shell 6 comprises two half shells, and the two half shells are clamped from the length direction of the metal piece 1; specifically, as shown in Figure 3 , a clamping ring 7 is integrally formed on the left half shell, a clamping groove matched with the clamping ring 7 is opened on the right half shell, and the end portion 3 of the clamping ring 7 and the bottom of the clamping groove are provided with recesses and protrusions 8 in a bent line which are matched with each other.

[0036] The slow-dissolving shell 6 is an aluminum alloy shell, and the clamping ring 7 is also made of aluminum alloy material.

[0037] Embodiment 3

[0038] Different from the embodiment 2, the two half shells are clamped from the width direction of the metal piece 1.

[0039] Embodiment 4

[0040] Different from the embodiment 1, the metal piece 1 is an aluminum alloy.

[0041] The above only is the embodiment of the present application, and the well-known specific technical solutions and / or common knowledge in the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A temporary plugging cone structure, characterized in that: The metal piece and the rubber layer covering the metal piece are both double-head conical structures, and both the rubber layer and the metal piece comprise an end portion, a taper portion and a waist portion connected in sequence, the size of the metal piece at the maximum position in the width direction of the waist portion is 12-25mm, the size of the metal piece at the minimum position of the taper portion is 2-5mm, the angle of the taper portion of the metal piece is 43-55°, the angle of the taper portion of the rubber layer is 65-75°, and the thickness of the rubber layer is 2.5-6mm.

2. The temporary plugging cone structure according to claim 1, wherein: The size of the metal piece at the maximum position in the width direction of the waist portion is 18.4mm, the size of the metal piece at the minimum position of the taper portion is 2.7mm, the angle of the taper portion of the metal piece is 48.4°, and the angle of the taper portion of the rubber layer is 69.7°.

3. A bridge plug cone structure according to either of claims 1 or 2, wherein: The thickness of the rubber layer is uniformly set or gradually reduced from the waist portion to the end portion.

4. The temporary plugging cone structure according to claim 3, characterized in that: The end portion and the waist portion are both circular arc transition positions.

5. The temporary plugging cone structure according to any one of claims 1 or 4, characterized in that: The metal piece is a soluble magnesium alloy.

6. The temporary plugging cone structure according to any one of claims 1 or 4, characterized in that: The metal piece is an aluminum alloy.

7. The temporary plugging cone structure of claim 5, wherein: A slow-dissolving shell is further arranged between the metal piece and the rubber layer, the slow-dissolving shell comprises two half shells clamped together, the metal piece is wrapped in the slow-dissolving shell, and the rubber layer covers the slow-dissolving shell.

8. The bridge plug cone structure of claim 7, wherein: The two half shells are clamped together in the length or width direction of the metal piece.

9. The temporary plugging cone structure of claim 8, wherein: One of the half shells is provided with a clamping ring, and the other half shell is provided with a clamping groove matched with the clamping ring, and the end of the clamping ring and the bottom of the clamping groove are provided with concave-convex portions matched with each other.

10. A bridge plug cone structure according to any one of claims 7 to 9, wherein: The slow-dissolving shell is an aluminum alloy shell.

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