Double-wall continuous circulating valve

Abstract

The utility model discloses a double-wall continuous circulating valve which comprises a double-wall main valve body (1) with an inner-layer channel and an outer-layer channel, one layer of channel is a drilling fluid injection channel, the other layer of channel is a gas injection channel, a double-wall ball valve I (6) is arranged on the upper portion of the double-wall main valve body (1), and a double-wall ball valve II (7) is arranged on the lower portion of the double-wall main valve body (1). The double-wall ball valve I (6) comprises a ball valve I inner pipe channel (7), a ball valve I outer pipe channel (8) and a ball valve switch I (9); a double-wall ball valve II (10) is arranged on the lower portion of the double-wall main valve body (1) and comprises a double-wall ball valve II outer pipe channel (11), a double-wall ball valve II inner pipe channel (12), a left valve body (13), a right valve body (14) and a ball valve switch II (15). According to the utility model, the continuous circulation of the shaft in the single connecting process can be kept uninterrupted, and the pressure of the shaft is kept stable.

Description

Technical Field

[0001] The utility model relates to the technical field of double-wall drill pipe annulus gas injection leakage prevention and anti-sticking drilling, in particular to a double-wall continuous circulation valve. Background Art

[0002] In oil and gas drilling projects, leakage problems in low-pressure and high-pressure narrow safety density window formations are common, such as: Tarim Ordovician carbonate low-pressure reservoirs, pressure-depleted oil and gas reservoirs, Changning shale gas fracture / cavern low-pressure formations, etc. Gas injection / gas-filled drilling technology is an effective means to solve the leakage problem in low-pressure and narrow safety density window formations. Among them, double-wall drill pipe annulus gas injection drilling technology performs well in solving the problem of drilling in formations with severe leakage. It has the advantages of low gas injection pressure, simple maintenance of gas injection channels, no impact on the use of downhole power drilling tools, and no restrictions on the use of measurement tools while drilling. However, in the process of connecting single roots, the gas injection cycle needs to be repeatedly rebuilt. When the cycle is rebuilt, the wellbore pressure fluctuates greatly, which is not conducive to maintaining the stability of the wellbore pressure, and increases the risks of leakage and stuck drill.

[0003] Aiming at the problem of repeated reconstruction of circulation during the single-root connection process of double-wall drill pipe annulus gas injection drilling, a double-wall continuous circulation valve suitable for double-wall drill pipe annulus gas injection drilling is designed. The valve is installed on the top of each column of double-wall drill pipe. During the single-root connection process, the double-wall continuous circulation valve is used to achieve uninterrupted wellbore circulation during the single-root connection process, maintain stable wellbore pressure during the entire drilling process, and reduce the risks of circulation loss, well kick overflow, pressure difference drill sticking, sand settling drill sticking, etc. Utility Model Content

[0004] The utility model aims to provide a double-wall continuous circulation valve to solve the problem of repeated reconstruction of gas injection circulation during the double-wall drill pipe annulus gas injection drilling connection process, thereby maintaining the wellbore pressure stable during the entire drilling process and reducing the risks of leakage, well kick, and pipe sticking.

[0005] The utility model is realized by adopting the following technical scheme: a double-wall continuous circulation valve, comprising a double-wall main valve body with inner and outer channels, wherein one channel is a drilling fluid injection channel, and the other channel is a gas injection channel; a double-wall ball valve I is arranged on the upper part of the double-wall main valve body, and the double-wall ball valve I comprises an inner tube channel of the ball valve I, an outer tube channel of the ball valve I and a ball valve switch I; a double-wall ball valve II is arranged on the lower part of the double-wall main valve body, and the double-wall ball valve II comprises an outer tube channel of the double-wall ball valve II, an inner tube channel of the double-wall ball valve II, a left valve body, a right valve body and a ball valve switch II.

[0006] Furthermore, the double-wall main valve body comprises a double-wall outer tube I and a double-wall inner tube I, and the double-wall outer tube I and the double-wall inner tube I are fixed by welding via a positioning block.

[0007] Furthermore, an outer tube channel I is provided between the double-wall outer tube I and the double-wall inner tube I, and the outer tube channel I is a gas injection channel. An inner tube channel I is provided inside the double-wall inner tube I, and the inner tube channel I is a drilling fluid injection channel.

[0008] Furthermore, the double-walled ball valve I is a double-channel plug valve, and the double-walled ball valve I is sealed with the double-walled outer tube I and the double-walled inner tube I by means of a rubber gasket.

[0009] Furthermore, the ball valve switch I can rotate 90°. When the ball valve switch I is at 0°, the inner tube channel of the ball valve I is connected to the inner tube channel I, and the outer tube channel of the ball valve I is connected to the outer tube channel I. At this time, the double-walled ball valve I is in an open state.

[0010] Furthermore, the double-walled ball valve II is a double-channel hemispheric valve, which is arranged on the lower side wall of the double-walled main valve body, wherein the left valve body can be rotated 90° through the ball valve switch II, and the right valve body is welded to the double-walled main valve body, and rubber is used for sealing between the double-walled outer tube I, the left valve body and the right valve body.

[0011] Furthermore, the left valve body is provided with a left valve body inner channel and a left valve body outer channel, wherein the left valve body inner channel is connected to the inner tube channel of the double-walled ball valve II, and the left valve body outer channel is connected to the outer tube channel of the double-walled ball valve II;

[0012] The right valve is provided with a right valve body inner channel and a right valve body outer channel, wherein the right valve body inner channel is connected with the inner tube channel I, and the right valve body outer channel is connected with the outer tube channel I.

[0013] The beneficial effects of the utility model are:

[0014] 1. In the process of double-wall drill pipe annulus gas injection drilling, the double-wall continuous circulation valve is used to maintain the continuous circulation of the wellbore during the single connection process, keep the wellbore pressure stable, and help reduce accidents such as well leakage, well kick, and drill sticking.

[0015] 2. The use of double-wall continuous circulation valve can realize continuous circulation during the single-rod connection process, avoiding the reconstruction process of double-wall drill pipe annulus gas injection drilling after single-rod connection, and improving drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the double-layer pipe joint structure;

[0019] In the figure, 1-double-wall main valve body, 2-double-wall outer tube I, 3-double-wall inner tube I, 4-outer tube channel I, 5-inner tube channel I, 6-double-wall ball valve I, 7-inner tube channel of ball valve I, 8-outer tube channel of ball valve I, 9-ball valve switch I, 10-double-wall ball valve II, 11-outer tube channel of double-wall ball valve II, 12-inner tube channel of double-wall ball valve II, 13-left valve body, 1301-left valve body channel, 1302-left valve body inner channel, 14-right valve body, 1401-right valve body channel, 1402-right valve body outer channel, 15-ball valve switch II, 16-positioning block, 17-double-layer pipe joint, 18-second drilling fluid injection pipeline, 19-second gas injection pipeline, 20-double-wall outer tube II, 21-double-wall inner tube II, 22-outer tube channel II, 23-inner tube channel II, 24-double-layer outlet end. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0023] See also Figure 1 , Figure 2 A double-walled continuous circulation valve suitable for double-walled drill pipe annulus gas injection drilling is pre-installed on the top of the drill string when in use. It includes a double-walled main valve body 1 with inner and outer two-layer channels, a double-walled ball valve I6 located on the upper part of the double-walled main valve body, and a double-walled ball valve II10 located on the lower part of the double-walled valve body. In the process of connecting a single root, the double-walled continuous circulation valve and the double-layer pipe joint 17 together realize continuous and uninterrupted circulation of the wellbore.

[0024] In this embodiment, the double-wall main valve body 1 is composed of a double-wall outer tube Ⅰ2 and a double-wall inner tube Ⅰ3, and the double-wall outer tube Ⅰ2 and the double-wall inner tube Ⅰ3 are welded and fixed by a positioning block 16, wherein the outer tube channel Ⅰ4 is a gas injection channel, and the inner tube channel Ⅰ5 is a drilling fluid injection channel. The double-wall ball valve Ⅰ6 is a double-wall plug valve coaxial with the double-wall main valve body 1, including the inner tube channel 7 of the ball valve Ⅰ, the outer tube channel 8 of the ball valve Ⅰ, and the ball valve switch Ⅰ9. The double-wall ball valve Ⅱ10 is installed on the side wall of the double-wall main valve body 1, including the outer tube channel 11 of the double-wall ball valve Ⅱ, the inner tube channel 12 of the double-wall ball valve Ⅱ, the left valve body 13, the left valve body channel 1301, the left valve body inner channel 1302, the right valve body 14, the right valve body channel 1401, the right valve body outer channel 1402, and the ball valve switch Ⅱ15.

[0025] In this embodiment, the double-layer pipe joint 17 includes a second gas injection pipeline 19, a second drilling fluid injection pipeline 18 and a double-layer outlet port 24, and the double-layer outlet port 24 includes a double-wall outer pipe II 20, a double-wall inner pipe II 21, an outer pipe channel II 22 and an inner pipe channel II 23.

[0026] Specifically, the double-walled ball valve I6 is installed on the upper part of the double-walled main valve body 1, and is a double-channel plug valve. It can be rotated 90° through the ball valve switch I9, and the double-walled ball valve I6 and the double-walled outer tube I2 and the double-walled inner tube I3 are sealed by rubber pads. When the ball valve switch I9 is ​​at 0°, the inner tube channel 7 of the ball valve I is connected to the inner tube channel I5, and the outer tube channel 8 of the ball valve I is connected to the outer tube channel I4, and the double-walled ball valve I6 is in an open state; when the ball valve switch I9 is ​​rotated 90°, the double-walled ball valve I6 is in a closed state.

[0027] Specifically, the double-walled ball valve II 10 is installed on the lower side wall of the double-walled main valve body 1, and is a double-channel hemispherical valve, which consists of a left valve body 13 and a right valve body 14. The left valve body 13 can be rotated 90 degrees through the ball valve switch II 15, and the right valve body 14 is welded to the double-walled main valve body 1. Rubber is used to seal the double-walled outer tube I2, the left valve body 13 and the right valve body 14. Further, there are a left valve body channel 1301 and a left valve body channel 1302 on the left valve body 13, and the left valve body channel 1301 is connected to the inner tube channel 12 of the double-walled ball valve II, and the left valve body channel 1302 is connected to the outer tube channel 11 of the double-walled ball valve II; there are a right valve body channel 1401 and a right valve body channel 1402 on the right valve body 14, and the right valve body channel 1401 is connected to the inner tube channel I5, and the right valve body channel 1402 is connected to the outer tube channel I4. Furthermore, when the ball valve switch Ⅱ15 is at 0°, the left valve body inner channel 1301 is connected to the right valve body inner channel 1401, the left valve body outer channel 1302 is connected to the right valve body outer channel 1402, and the double-walled ball valve Ⅱ10 is in an open state. When the ball valve switch Ⅱ15 is rotated 90°, the double-walled ball valve Ⅱ10 is in a closed state.

[0028] During the use of the double-wall continuous circulation valve, when the double-wall ball valve I6 is opened and the double-wall ball valve II10 is closed, the double-wall continuous circulation valve is in a drilling state; when the double-wall ball valve I6 is closed and the double-wall ball valve II10 is opened, the double-wall continuous circulation valve is in a continuous circulation state.

[0029] Specifically, during the normal drilling process of the double-wall drill pipe annulus gas injection drilling technology, the double-wall ball valve I6 is opened and the double-wall ball valve II10 is closed, and the double-wall continuous circulation valve is kept in the drilling state. During the single-root connection process, the double-layer outlet end 24 of the double-layer pipe joint 17 is connected to the double-wall ball valve II10, and the double-wall ball valve II10 is opened first, and gas is injected through the second gas injection pipeline 19 and the second drilling fluid injection pipeline 18. Then, the double-wall ball valve I6 is closed, and the continuous circulation state is switched to start the single-root connection operation. After the single-root connection is completed, the double-wall continuous circulation valve is switched back to the normal drilling state, and the double-layer outlet end 24 is removed to resume normal drilling. During the double-wall drill pipe annulus gas injection drilling process of connecting a single root, the double-wall drill pipe annulus gas injection and drilling fluid injection circulation are kept uninterrupted, which is conducive to reducing well leakage and stuck drill accidents.

[0030] Based on the above embodiments, the present invention has at least the following technical effects:

[0031] 1. In the process of double-wall drill pipe annulus gas injection drilling, the double-wall continuous circulation valve is used to maintain the continuous circulation of the wellbore during the single connection process, keep the wellbore pressure stable, and help reduce accidents such as well leakage, well kick, and drill sticking.

[0032] 2. The use of double-wall continuous circulation valve can realize continuous circulation during the single-rod connection process, avoiding the reconstruction process of double-wall drill pipe annulus gas injection drilling after single-rod connection, and improving drilling efficiency.

[0033] It should be noted that the terms "connection" and "setting" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "connection" and "setting" may explicitly or implicitly include one or more of the features. Moreover, the terms "connection", "setting" and the like are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. And for the aforementioned embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited to the described order of actions, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification belong to preferred embodiments, and the actions involved are not necessarily required by the present application.

[0034] The above embodiments describe the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the changes and modifications made by the technicians in this field shall be within the scope of protection of the claims attached to the utility model.

Claims

1. A double-wall continuous circulation valve, characterized in that: A double-walled main valve body (1) comprises two layers of inner and outer channels, wherein one layer of the channels is a drilling fluid injection channel and the other layer of the channels is a gas injection channel. A double-walled ball valve I (6) is arranged on the upper part of the double-walled main valve body (1). The double-walled ball valve I (6) comprises an inner tube channel (7) of the ball valve I, an outer tube channel (8) of the ball valve I and a ball valve switch I (9). A double-walled ball valve II (10) is arranged on the lower part of the double-walled main valve body (1). The double-walled ball valve II (10) comprises an outer tube channel (11) of the double-walled ball valve II, an inner tube channel (12) of the double-walled ball valve II, a left valve body (13), a right valve body (14) and a ball valve switch II (15).

2. A double-wall continuous circulation valve as claimed in claim 1, characterized in that: The double-wall main valve body (1) comprises a double-wall outer tube I (2) and a double-wall inner tube I (3), and the double-wall outer tube I (2) and the double-wall inner tube I (3) are fixed by welding via a positioning block (16).

3. A double-wall continuous circulation valve as claimed in claim 2, characterized in that: An outer tube channel I (4) is provided between the double-wall outer tube I (2) and the double-wall inner tube I (3), and the outer tube channel I (4) is a gas injection channel. An inner tube channel I (5) is provided in the double-wall inner tube I (3), and the inner tube channel I (5) is a drilling fluid injection channel.

4. A double-wall continuous circulation valve as claimed in claim 3, characterized in that: The double-wall ball valve I (6) is a double-channel plug valve, and the double-wall ball valve I (6) is sealed with the double-wall outer tube I (2) and the double-wall inner tube I (3) by means of a rubber gasket.

5. A double-wall continuous circulation valve as claimed in claim 4, characterized in that: The ball valve switch I (9) can rotate 90 degrees. When the ball valve switch I (9) is at 0 degrees, the inner tube channel (7) of the ball valve I is connected to the inner tube channel I (5), and the outer tube channel (8) of the ball valve I is connected to the outer tube channel I (4). At this time, the double-walled ball valve I (6) is in an open state.

6. A double-wall continuous circulation valve as claimed in claim 5, characterized in that: The double-wall ball valve II (10) is a double-channel hemispherical valve, which is arranged on the lower side wall of the double-wall main valve body (1), wherein the left valve body (13) can be rotated 90 degrees through the ball valve switch II (15), the right valve body (14) is welded to the double-wall main valve body (1), and rubber is used to seal the double-wall outer tube I (2), the left valve body (13) and the right valve body (14).

7. A double-wall continuous circulation valve as claimed in claim 6, characterized in that: The left valve body (13) is provided with a left valve body inner channel (1301) and a left valve body outer channel (1302), wherein the left valve body inner channel (1301) is connected to the inner tube channel (12) of the double-walled ball valve II, and the left valve body outer channel (1302) is connected to the outer tube channel (11) of the double-walled ball valve II; The right valve body (14) is provided with a right valve body inner channel (1401) and a right valve body outer channel (1402), wherein the right valve body inner channel (1401) is connected to the inner tube channel I (5), and the right valve body outer channel (1402) is connected to the outer tube channel I (4).

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