Test adapter substitute and test wellhead

Abstract

The utility model relates to the technical field of test wellhead adapters, in particular to a test adapter which comprises a test wellhead body and an adapter body, a first flange at the top end of the test wellhead body is connected with a second flange through a bolt, and the second flange is fixed at the bottom end of the adapter body. Sealing grooves are formed in the surfaces of the first flange and the second flange, and sealing gaskets are embedded in the sealing grooves; the sealing structure has the beneficial effects that when the first flange and the second flange are connected through bolts, the two sets of sealing grooves correspond to the corresponding sealing pressing blocks, the sealing pressing blocks are located over the sealing grooves to apply pressure to the sealing gaskets, the bevel edges of the sealing gaskets are attached to the multiple sets of inner trapezoidal protruding blocks in the grooves, multiple contact faces are formed, the pressing force and the attaching performance are enhanced, and the sealing effect is improved. Therefore, a sealed space is constructed, and substances in a wellhead cannot leak; due to the fact that two groups of sealing structures in opposite directions are adopted, media in the well mouth can be effectively prevented from leaking outwards.

Description

Technical Field

[0001] This utility model relates to the field of test wellhead adapters, specifically a test conversion adapter. Background Technology

[0002] During oil and gas well testing, the fluid pressure, flow rate, and composition at the wellhead can be accurately measured to determine the production capacity and reserves of the oil and gas reservoir, thereby providing a basis for subsequent development plans. Therefore, a high-strength and highly airtight connection interface needs to be formed between the test wellhead and the upper equipment to ensure that the oil in the well does not leak during the test. Since the test equipment cannot be directly connected to the test wellhead, which is a fixed structure with a relatively large interface and a small outer diameter of the test equipment, a test adapter is required for connection.

[0003] However, in the existing technology, sealing is achieved by embedding gaskets on flange one and flange two. However, under high pressure, leakage is prone to occur due to uneven stress on the sealing surface, gasket displacement or aging, resulting in a decrease in the overall sealing effect and a short-lasting sealing effect. Utility Model Content

[0004] The purpose of this invention is to provide a test adapter to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: it includes a test wellhead body and a conversion joint body. A flange one at the top of the test wellhead body is connected to a flange two by bolts. The flange two is fixed to the bottom of the conversion joint body. Both flange one and flange two have sealing grooves on their surfaces. A sealing gasket is embedded in the sealing groove, and a sealing structure is pressed onto the surface of the sealing gasket.

[0006] Preferably, the sealing groove is provided in two sets, and the groove opening of the sealing groove is an isosceles trapezoidal annular structure. The sealing groove near the inner ring of the test wellhead body is opened on the surface of flange two, and the other set is opened on the surface of flange one.

[0007] Preferably, the inner bottom end of the sealing groove is provided with an embedding groove, the width of which is smaller than the width of the inner bottom end of the sealing groove, and the embedding groove has a ring structure.

[0008] Preferably, the bottom end of the sealing gasket is located within the groove, the inclined side of the sealing gasket fits against the inclined side of the sealing groove, and the shape of the sealing gasket is the same as the shape of the sealing groove.

[0009] Preferably, the sealing structure includes a sealing block and an inner trapezoidal protrusion. The sealing block is fixed to the surfaces of flange one and flange two. There are two sets of sealing blocks, and each sealing block corresponds to a sealing groove. The sealing block is located directly above the sealing groove. The sealing block is an annular structure with an isosceles trapezoidal cross-section. The size of the sealing block is smaller than the size of the sealing groove. There are multiple sets of inner trapezoidal protrusions, and the inner trapezoidal protrusions are fixed on the two inclined sides of the sealing groove. The inner trapezoidal protrusions are distributed in an array along the inclined sides. When flange one and flange two are bolted together, the sealing block presses the sealing gasket, and the inclined side of the sealing gasket is pressed against the surface of the inner trapezoidal protrusion.

[0010] A test wellhead, including the aforementioned test adapter.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The test adapter proposed in this utility model, when flange one and flange two are connected by bolts, at this time, the two sets of sealing grooves correspond to their respective sealing blocks. The sealing blocks are located directly above the sealing grooves and apply pressure to the sealing gasket, so that the inclined edge of the sealing gasket fits against the multiple sets of inner trapezoidal protrusions in the groove, forming multiple contact surfaces, enhancing the clamping force and fit, thereby constructing a closed sealing space, so that the material in the wellhead cannot leak; due to the use of two sets of sealing structures with opposite directions, it can effectively prevent the medium inside the wellhead from leaking outward, greatly improving the sealing effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This utility model Figure 1 A top-view structural diagram;

[0015] Figure 3 This utility model Figure 2 Schematic diagram of the cross-sectional structure along the middle AA direction;

[0016] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0017] Figure 5 This is an exploded view of the overall structure of this utility model;

[0018] Figure 6 This is a schematic diagram of the test wellhead body structure of this utility model;

[0019] Figure 7 This utility model Figure 6 A top-view structural diagram;

[0020] Figure 8 This utility model Figure 7 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0021] Figure 9 This utility model Figure 8 Enlarged structural diagram at point B;

[0022] Figure 10 This is a schematic diagram of the main structure of the adapter body of this utility model;

[0023] Figure 11 This utility model Figure 10 A top-view structural diagram;

[0024] Figure 12 This utility model Figure 11 Schematic diagram of the cross-sectional structure along the CC direction;

[0025] Figure 13 This utility model Figure 12 Schematic diagram of the cross-sectional structure along the C-axis.

[0026] In the diagram: 1. Test wellhead body; 2. Transformer joint body; 3. Flange 1; 4. Flange 2; 5. Sealing block; 6. Sealing groove; 7. Inner trapezoidal protrusion; 8. Embedded groove; 9. Sealing gasket. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] Example 1

[0029] Please see Figures 1-13 This utility model provides a technical solution: a test adapter, such as... Figure 1 As shown, it includes a test wellhead body 1 and a conversion joint body 2. The flange 3 at the top of the test wellhead body 1 is connected to a flange 4 by bolts. The flange 4 is fixed to the bottom of the conversion joint body 2.

[0030] Specifically, the test wellhead body 1 is the lower pressure-bearing component of the integral structure, which is in the shape of a hollow cylinder. Its upper end is provided with flange 2 for connection. As part of the connection interface, it has the characteristics of high strength and high pressure resistance, and is used to bear the load force of the upper structure and the internal fluid pressure. The conversion joint body 2 is the upper structure that docks with the test wellhead body 1. The flange 2 4 at the bottom of the conversion joint body 2 is connected to the flange 3 at the upper end of the test wellhead body 1 by bolts.

[0031] Example 2

[0032] Based on Embodiment 1, in order to improve the sealing effect between flange 3 and flange 4, it is proposed that sealing grooves 6 be provided on the surfaces of both flange 3 and flange 4. Two sets of sealing grooves 6 are provided, and the openings of the sealing grooves 6 are annular structures with isosceles trapezoidal shapes. The sealing groove 6 near the inner ring of the test wellhead body 1 is located on the surface of flange 4, and the other set is located on the surface of flange 3. A sealing gasket 9 is embedded in the sealing groove 6. A groove 8 is formed at the inner bottom end of the sealing groove 6. The width of the groove 8 is smaller than the width of the groove at the inner bottom end of the sealing groove 6. The groove 8 is annular in shape. The bottom end of the sealing gasket 9 is located within the groove 8, and the inclined side of the sealing gasket 9 fits against the inclined side of the sealing groove 6. The shape of the sealing gasket 9 and the shape of the sealing groove 6 are also similar. Similarly, the sealing gasket 9 has a sealing structure pressed onto its surface. The sealing structure includes a sealing block 5 and an inner trapezoidal protrusion 7. The sealing block 5 is fixed on the surface of flange 3 and flange 4. There are two sets of sealing blocks 5, and the sealing blocks 5 and the sealing grooves 6 correspond one-to-one. The sealing blocks 5 are located directly above the sealing grooves 6. The sealing blocks 5 are annular structures with an isosceles trapezoidal cross-section. The size of the sealing blocks 5 is smaller than the size of the sealing grooves 6. There are multiple sets of inner trapezoidal protrusions 7, and the inner trapezoidal protrusions 7 are fixed on the two inclined sides of the sealing grooves 6. The inner trapezoidal protrusions 7 are distributed along the inclined sides. When flange 3 and flange 4 are bolted together, the sealing block 5 presses the sealing gasket 9, and the inclined side of the sealing gasket 9 is pressed onto the surface of the inner trapezoidal protrusion 7.

[0033] Specifically, during the connection process of flange 3 and flange 4, sealing gaskets 9 are pre-embedded in the two sets of sealing grooves 6. The bottom end of the sealing gasket 9 is embedded in the groove 8 opened at the bottom end of the sealing groove 6, thus fixing it in place. Then, the sealing pressure block 5 is aligned and placed over the sealing groove 6. Next, flange 3 and flange 4 are tightened with bolts, causing the sealing pressure block 5 to press downward under axial force. At this time, the sealing pressure block 5 presses the sealing gasket 9 into the sealing groove 6. The sealing gasket 9 deforms under force, and its inclined edge is further pressed in and adheres to the surface of the inner trapezoidal protrusion 7, achieving multi-point contact. The inner trapezoidal protrusions 7 are distributed in an array along the inclined edge of the groove, enhancing the support and anti-extrusion ability of the sealing gasket 9, as well as its sealing performance. Through the pressing action of the sealing pressure block 5 on the sealing gasket 9, and the inclined surface cooperation between the sealing gasket 9 and the multiple sets of inner trapezoidal protrusions 7, a reliable sealing effect is achieved, ultimately forming a closed sealing space to prevent leakage of the medium inside the wellhead.

[0034] Example 3

[0035] A test wellhead, comprising the aforementioned test adapter.

[0036] During use, in the connection process of flange 3 and flange 4, sealing gaskets 9 are pre-embedded in the two sets of sealing grooves 6. The bottom end of the sealing gasket 9 is embedded in the groove 8 opened at the bottom end of the sealing groove 6 to fix it. Then, the sealing pressure block 5 is aligned and covered on top of the sealing groove 6. Immediately afterwards, flange 3 and flange 4 are fastened with bolts, so that the sealing pressure block 5 is pressed downward under axial force. At this time, the sealing pressure block 5 presses the sealing gasket 9 into the sealing groove 6. The sealing gasket 9 deforms after being stressed, and its inclined edge is further pressed in and fits against the surface of the inner trapezoidal protrusion 7 to achieve multi-point contact. The inner trapezoidal protrusions 7 are distributed in an array along the inclined edge of the groove, which enhances the support and anti-extrusion ability of the sealing gasket 9, as well as the sealing performance. Through the pressing effect of the sealing pressure block 5 on the sealing gasket 9, and the inclined surface cooperation between the sealing gasket 9 and the multiple sets of inner trapezoidal protrusions 7, a reliable sealing effect is achieved, and finally a closed sealing space is formed to prevent leakage of the medium inside the wellhead.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test adapter, comprising a test wellhead body (1) and an adapter body (2), wherein a flange one (3) at the top of the test wellhead body (1) is bolted to a flange two (4), and the flange two (4) is fixed to the bottom end of the adapter body (2), characterized in that: Both flange 1 (3) and flange 2 (4) have sealing grooves (6) on their surfaces. Sealing gaskets (9) are embedded in the sealing grooves (6) and sealing structures are pressed onto the surface of the sealing gaskets (9).

2. A test adapter according to claim 1, characterized in that: The sealing groove (6) is provided in two sets, and the groove of the sealing groove (6) is an isosceles trapezoidal ring structure. The sealing groove (6) near the inner ring of the test well body (1) is opened on the surface of flange two (4), and the other set is opened on the surface of flange one (3).

3. A test adapter according to claim 2, characterized in that: The inner bottom end of the sealing groove (6) is provided with a groove (8), the groove width of the groove (8) is smaller than the groove width of the inner bottom end of the sealing groove (6), and the groove (8) has a ring structure.

4. A test adapter according to claim 3, characterized in that: The bottom end of the sealing gasket (9) is located in the groove (8), the inclined side of the sealing gasket (9) fits with the inclined side of the sealing groove (6), and the shape of the sealing gasket (9) is the same as the shape of the sealing groove (6).

5. A test adapter according to any one of claims 2-4, characterized in that: The sealing structure includes a sealing block (5) and an inner trapezoidal protrusion (7). The sealing block (5) is fixed on the surface of flange one (3) and flange two (4). There are two sets of sealing blocks (5), and the sealing blocks (5) and the sealing grooves (6) correspond one-to-one. The sealing blocks (5) are located directly above the sealing grooves (6). The sealing blocks (5) are annular structures with an isosceles trapezoidal cross-section. The size of the sealing blocks (5) is smaller than the size of the sealing grooves (6). There are multiple sets of inner trapezoidal protrusions (7), and the inner trapezoidal protrusions (7) are fixed on the two sides of the inclined sides of the sealing grooves (6). The inner trapezoidal protrusions (7) are distributed along the inclined sides. When flange one (3) and flange two (4) are bolted together, the sealing blocks (5) press the sealing gasket (9), and the inclined sides of the sealing gasket (9) are pressed onto the surface of the inner trapezoidal protrusions (7).

6. A test wellhead, characterized in that: The test adapter includes any one of claims 1-5.

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