CN209818038U - A gas-liquid dual-flow dispensing tool - Google Patents

Abstract

The utility model provides a gas-liquid dual-flow dispensing tool for the gas-liquid double-flow drilling process, which has a short axial dimension and can quickly replace vulnerable sealing components, including a main shaft, a locking sleeve, a central pipe, a bolt group, a sealing nest, an inner Gas injection housing, bearings, rotary seals, gas injection static seals, elbows, Youren interfaces, etc. The center pipe inside the main shaft is used to transmit drilling fluid. There are two through gas injection holes in the side of the middle of the main shaft. Through the annular space between the main shaft and the central pipe and the central pipe, an upper single input and lower double output channel structure is formed. The outer side of the main shaft is the upper and lower Symmetrical rotary gas injection assembly, the outermost part of the component is the gas injection shell, and the middle is two sealed nests symmetrically distributed up and down. One end of the sealed nest is sealed with the main shaft by a gray ring, and the other end is realized by an angular contact ball bearing. The rotary connection with the main shaft, the upper and lower sealing nests and the air injection hole of the main shaft together form a rotary sealing air injection channel.

Description

A gas-liquid dual-flow dispensing tool

technical field

The utility model relates to a wellhead matching tool for the gas-liquid dual-flow drilling technology in the field of oil and gas exploration and development drilling engineering, in particular to a gas-liquid dual-flow dispensing tool.

Background technique

In the process of wellbore establishment in oil and gas exploration and development, the use of gas-liquid dual-flow drilling is an economical and efficient technical choice for hard formations without water, serious leakage formations, severe water shortage formations, and formations with low formation pressure and clear distribution rules. Gas-liquid dual-flow drilling is to use double-walled drill pipes (that is, drill pipes with two layers of metal tubes coaxially nested with two flow channels). The outer annulus of the double-walled drill pipe injects high-pressure gas to the appropriate position of the drill string and enters the annulus between the drill string and the well wall. The high-pressure gas mixes with the drilling fluid to greatly reduce the density of the drilling fluid, thereby effectively controlling the bottom hole pressure and implementing underbalance Drilling process operation, and finally establish the wellbore efficiently.

A key tool for gas-liquid dual-flow drilling is the gas-liquid dual-flow dispensing tool located at the wellhead of the drill floor. It is connected with a kelly or top drive at the top, a double-wall drill pipe at the bottom, and a high-pressure gas injection pipeline on the side. The gas-liquid double-flow dispenser includes a mandrel, a gas distribution assembly, a bearing and a seal assembly, etc. The mandrel can rotate with the drill string, and the gas distribution assembly can rotate relative to the drill string through bearings, seal assemblies and other components and can input high-pressure gas. Sealing components are wearing parts. The existing gas-liquid dual-flow dispenser has poor sealing reliability, the sealing components cannot be replaced on site, and the maintenance tools take up a long working time. At the same time, the overall axial size of the tools is too long, resulting in a high position for dismantling the wellhead and poor wellhead operation efficiency.

Utility model content

The technical problem to be solved by the utility model is to provide a gas-liquid dual-flow dispensing tool with a short axial dimension and quick replacement of the seal for the gas-liquid dual-flow drilling process in view of the shortcomings of the existing technology, so as to improve operating efficiency and gas-liquid dispensing tool reliability.

In order to achieve the above object, the technical solution adopted by the utility model to solve the technical problems is:

A gas-liquid double-flow dispensing tool, including a main shaft 1, a central pipe 3, a gas distribution assembly, and a bearing 11; wherein: the main shaft 1 is a hollow rotating cylinder, the upper end is provided with an upper joint, and the inner side of the upper joint is sequentially arranged from top to bottom Lock buckle 102 and step structure 103 are arranged, the lower end is provided with a joint, and the middle part of main shaft 1 is provided with a through air injection hole 107 in the direction of the vertical axis; Tight, the center pipe 3 is close to the main shaft 1 below the air injection hole 107, and the part below it is an outer diameter reduction structure, and the upper single input and lower double output channel structure is formed between the central pipe 3 and the main shaft 1; the gas distribution assembly is rotated and sealed on the main shaft through the bearing 11 1 air injection hole 107 outer periphery.

further:

The gas distribution assembly includes a sealed nest body 5, an air injection housing 7, a rotary seal 12 and an elbow 14; the sealed nest body 5 is a hollow rotating body, the lower part is disc-shaped, the upper part is sleeve-shaped, and the inside is arranged with The rotating sealing groove 501 matched with the rotating seal 12, the upper end of the sealing nest body 5 has a smaller outer diameter than the lower end and a larger inner diameter. A plurality of bolt holes 505 are evenly distributed; the gas injection shell 7 is a sleeve-shaped body, and a plurality of threaded holes 701 are evenly distributed in the upper and lower end surfaces, and a cross-section is arranged as a stepped through hole on one side in the middle, and the inside of the through hole is a gas injection hole. The outer side of the channel 702 is connected and fitted with the elbow 14 .

The air injection hole 107 of the main shaft 1 is symmetrically arranged on both sides of the rotating air sealing surface 106, the bearing cylindrical surface 105 and the butter sealing surface 104; Two rotary sealing grooves 501, butter sealing groove 507 and oil cup hole 506 are arranged on the inner surface of the lower end; the outer side of the through hole of the gas injection shell 7 is the elbow welding hole 703, and the two sides of the gas injection hole inside the shell are the rotating sealing surface in turn 704 and static sealing surface 705.

The gas injection static seal 13 is also arranged at the static sealing surface 705 between the outer side of the sealing nest body 5 and the gas injection housing 7 .

An inner adjusting ring 6 and an outer adjusting ring 8 are respectively arranged inside and outside the bearing 11 between the main shaft 1 and the sealing nest body 5 .

A core tube seal 9 is provided at the place where the central tube 3 is seated on the main shaft 1 .

The gas-liquid double-flow dispensing tool of the utility model is used in the following steps: the upper part of the tool is connected with a kelly or top drive, the lower part is connected with a double-wall drill pipe, the side is connected with a high-pressure gas injection pipeline, and the drilling fluid input by the mud pump is injected into the double-wall through the central pipe. In the inner annular space of the drill pipe, the high-pressure gas enters from the gas injection hole of the tool, and enters the outer annular space of the double-walled drill pipe through the annular space between the main shaft and the central tube. When drilling, the main shaft part rotates with the drill string, and the rotating gas injection assembly is relatively static , When replacing the sealing assembly regularly, remove the connecting bolts of the upper and lower sealing nests respectively, take out the sealing nest and replace the corresponding seals and then install the tool.

The utility model has the following beneficial effects:

1. The axial dimension of the gas-liquid dual-flow dispensing tool is short. During the process of connecting the drill string, the wellhead disassembly operation height and operation space are moderate, and the original operation procedure does not need to be changed.

2. The gas-liquid dual-flow dispensing tool can quickly replace vulnerable sealing components on site, significantly improving the efficiency of gas-liquid dual-flow operation and the reliability of gas-liquid dispensing.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model.

Fig. 2 is a structural diagram of the key part main shaft 1 in Fig. 1 .

Fig. 3 is a structural diagram of the sealing nest body 5 of the key part in Fig. 1 .

FIG. 4 is a structural diagram of the key part gas injection housing 7 in FIG. 1 .

In the figure: main shaft 1, locking sleeve 2, central tube 3, bolt group 4, sealing nest 5, inner adjusting ring 6, gas injection housing 7, outer adjusting ring 8, core tube seal 9, grease fitting 10, bearing 11. Rotary seal 12, gas injection static seal 13, elbow 14, you any 15, butter seal 16, inner drill pipe buckle 101, locking buckle 102, step structure 103, outer drill pipe buckle 108, air injection hole 107, rotation Air sealing surface 106, bearing cylindrical surface 105, butter sealing surface 104, rotating sealing groove 501, static sealing groove 502, bearing mounting surface 503, shell mounting 504, bolt holes 505, butter sealing groove 507, oil cup hole 506, thread Hole 701 , gas injection channel 702 , elbow welding hole 703 , rotating sealing surface 704 , and static sealing surface 705 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Example 1

A gas-liquid double-flow dispensing tool, including a main shaft 1, a central pipe 3, a gas distribution assembly, and a bearing 11; wherein: the main shaft 1 is a hollow rotating cylinder, the upper end is provided with an upper joint, and the inner side of the upper joint is sequentially arranged from top to bottom Lock buckle 102 and step structure 103 are arranged, the lower end is provided with a joint, and the middle part of main shaft 1 is provided with a through air injection hole 107 in the direction of the vertical axis; Tight, the center pipe 3 is close to the main shaft 1 below the air injection hole 107, and the part below it is an outer diameter reduction structure, and the upper single input and lower double output channel structure is formed between the central pipe 3 and the main shaft 1; the gas distribution assembly is rotated and sealed on the main shaft through the bearing 11 1 air injection hole 107 outer periphery.

Example 2

On the basis of Example 1, the gas distribution assembly includes a sealed nest body 5, an air injection housing 7, a rotary seal 12 and an elbow 14; the sealed nest body 5 is a hollow rotary body, the lower part of which is disc-shaped, and the upper part It is sleeve-shaped, with a rotary seal groove 501 cooperating with the rotary seal 12 arranged on the inner side. The upper end of the seal nest body 5 has a smaller outer diameter than the lower end and a larger inner diameter. , a plurality of bolt holes 505 are evenly distributed parallel to the axis on the outer side of the disc-shaped rotating body; the gas injection shell 7 is a sleeve-shaped body, and a plurality of threaded holes 701 are evenly distributed in the upper and lower end faces, and a cross-section is arranged on one side in the middle to be stepped through The inner side of the through hole is the gas injection channel 702, and the outer side is connected and matched with the elbow 14.

Further, the rotating air sealing surface 106, the bearing cylindrical surface 105 and the butter sealing surface 104 are symmetrically arranged on both sides of the air injection hole 107 of the main shaft 1; a static sealing groove 502 is arranged on the outer side of the upper end of the sealing nest body 5 , two rotary sealing grooves 501 are arranged on the inner side, and a butter sealing groove 507 and an oil cup hole 506 are also arranged on the inner side of the lower end; the outer side of the through hole of the gas injection shell 7 is an elbow welding hole 703, and the two sides of the gas injection hole inside the shell are sequentially Rotary sealing surface 704 and static sealing surface 705.

Furthermore, a gas injection static seal 13 is arranged at the static sealing surface 705 between the outer side of the sealing nest body 5 and the gas injection housing 7 . An inner adjusting ring 6 and an outer adjusting ring 8 are respectively arranged inside and outside the bearing 11 between the main shaft 1 and the sealing nest body 5 . A core tube seal 9 is provided at the place where the central tube 3 is seated on the main shaft 1 .

typical embodiment 3

As shown in Figure 1, a gas-liquid double-flow dispensing tool includes a main shaft 1, a locking sleeve 2, a central tube 3, a bolt group 4, a sealing nest 5, an inner adjustment ring 6, an air injection housing 7, an outer adjustment Ring 8, core tube seal 9, grease nipple 10, bearing 11, rotary seal 12, gas injection static seal 13, bend pipe 14, any 15, grease seal 16. in:

The central part of the main shaft 1 is the central tube 3, which is used to transmit drilling fluid. The upper end of the central tube 3 is sealed on the stepped structure of the main shaft 1 with an O-ring seal seat, and is locked by the locking sleeve 2. There are two through the middle of the main shaft 1 laterally. The gas injection hole, through the annular space between the main shaft 1 and the central tube 3, and the central tube 3 form an upper single input and lower double output channel structure. The outer side of the main shaft 1 is a vertically symmetrical rotating gas injection component, and the outermost part of the component is the gas injection shell. Body 7, in the middle are two sealed nest bodies 5 symmetrically distributed up and down. The inner side of the sealed nest body 5 is arranged with a rotary seal, the outer side is arranged with a static seal, and the end face is arranged with a butter seal. Sealed and fixedly connected by bolt group 4, one end of the sealing nest body 5 adopts a gray ring to realize the rotary sealing with the main shaft 1, and the other end realizes the rotational connection with the main shaft 1 through the angular contact ball bearing 11, and the upper and lower sealing nest body 5 and the main shaft 1 note The air holes together form a rotating and sealed gas injection channel. Through holes are arranged on one side of the gas injection housing 7, and gas injection elbows 14 are welded at corresponding positions. The free ends of the elbows 14 are connected by any 15.

As shown in Figure 2, the main shaft 1 is a hollow rotating cylinder, which bears axial load, and the inner drill pipe buckle 101, locking buckle 102 and step structure 103 are arranged in sequence from top to bottom on the inner side of the upper end for connecting the central pipe, The lower end of the outer side is an outer drill pipe buckle 108, and there is an air injection hole 107 through the middle of the main shaft 1 in the direction of the vertical axis. The two sides of the air injection hole 107 are symmetrically arranged with a rotating air sealing surface 106, a bearing cylindrical surface 105 and a butter sealing surface 104 in sequence.

As shown in Figure 3, the sealed nest body 5 is a hollow rotary body, the lower end is disc-shaped, and the upper end is sleeve-shaped. One static sealing groove 502 is arranged on the outer side of the upper end of the sleeve-shaped body, and two rotating sealing grooves 501 are arranged on the inner side. The outer diameter of the lower end is smaller than that of the lower end, and the inner diameter is larger. The inner side of the lower end is the bearing installation surface 504, and the outer side is the housing installation surface 503. A plurality of bolt holes 505 are evenly distributed on the outer side of the disc-shaped rotating body parallel to the axis, and the inner surface is arranged with grease sealing grooves 507 and oil cup holes 506. .

As shown in Figure 4, the gas injection shell 7 is a sleeve-shaped body, with a plurality of threaded holes 701 evenly distributed in the upper and lower end surfaces, and a stepped through hole with a cross section arranged on one side in the middle, and the gas injection channel 702 is located inside the hole. The outer side is the elbow welding hole 703, and the two sides of the gas injection hole inside the casing are the rotating sealing surface 704 and the static sealing surface 705 in turn.

A gas-liquid dual-flow dispensing tool mentioned in the utility model, its use process is: the upper part of the tool is connected with a kelly or top drive, the lower part is connected with a double-walled drill pipe, the side is connected with a high-pressure gas injection pipeline, and the drilling fluid input by the mud pump Inject the inner annular space of the double-walled drill pipe through the central pipe 3, and the high-pressure gas enters through the tool gas injection hole 107, and enters the outer annular space of the double-walled drill pipe through the annular space between the main shaft 1 and the central pipe 3. When drilling, the main shaft 7 is accompanied by The drill string rotates, and the rotary gas injection assembly is relatively stationary. When the sealing assembly is replaced regularly, the connecting bolts 4 of the upper and lower sealing nests 5 are respectively removed, and the sealing nest 5 is taken out to replace the corresponding rotary seal 12 and butter seal 16 and then loaded into the tool.

Claims (6)

1. A gas-liquid double-flow dispensing tool, including a main shaft (1), a central tube (3), an air distribution assembly and a bearing (11); the feature is that the main shaft (1) is a hollow rotating cylinder, and The upper joint, the locking buckle (102) and the step structure (103) are arranged in sequence from top to bottom on the inner side of the upper joint, the lower end is provided with a lower joint, and the central axis of the main shaft (1) is provided with a through air injection hole (107) in the direction of the vertical axis; The upper end of the center tube (3) is sealed on the step structure of the main shaft (1), and is locked by the locking sleeve (2). , the center tube (3) and the main shaft (1) form an upper single input and lower double output channel structure; the gas distribution assembly is rotated and sealed on the outer periphery of the air injection hole (107) of the main shaft (1) through the bearing (11). 2. The gas-liquid double-flow dispensing tool according to claim 1, characterized in that: the gas distribution assembly includes a sealing nest (5), a gas injection housing (7), a rotary seal (12) and an elbow ( 14); the sealed nest body (5) is a hollow rotating body, the lower part is disc-shaped, the upper part is sleeve-shaped, and the inner side is arranged with a rotating sealing groove (501) that cooperates with the rotating seal (12), and the sealing nest body (5) The outer diameter of the upper end is smaller than that of the lower end, and the inner diameter is larger. The inner side of the lower end is the bearing installation surface (504) matched with the bearing (11), the outer side is the housing installation surface (503), and a plurality of bolt holes (505 ); the gas injection shell (7) is a sleeve-shaped body, with a plurality of threaded holes (701) evenly distributed in the upper and lower end surfaces, and a stepped through hole with a cross-section arranged on one side in the middle, and the inner side of the through hole is a gas injection channel ( 702), the outside is connected and matched with the elbow (14). 3. The gas-liquid double-flow dispensing tool according to claim 2, characterized in that: the air injection hole (107) of the main shaft (1) is symmetrically arranged on both sides of the rotating air sealing surface (106), bearing cylindrical surface (105 ) and butter sealing surface (104); one static sealing groove (502) is arranged on the outer side of the upper end of the sealing nest body (5), two rotating sealing grooves (501) are arranged on the inner side, and a butter sealing groove is arranged on the inner surface of the lower end Groove (507) and oil cup hole (506); the outer side of the through hole of the gas injection shell (7) is the elbow welding hole (703), and the two sides of the gas injection hole inside the shell are the rotating sealing surface (704) and the static seal Noodles (705). 4. The gas-liquid double-flow dispensing tool according to claim 3, characterized in that: a gas injection static seal is also arranged at the static sealing surface (705) between the outer side of the sealed nest body (5) and the gas injection shell (7). seal (13). 5. The gas-liquid double-flow dispensing tool according to claim 1 or 2, 3, 4, characterized in that: the inner and outer parts of the bearing (11) between the main shaft (1) and the sealed nest (5) are respectively provided with internal adjustment ring (6) and outer adjustment ring (8). 6. The gas-liquid double-flow dispensing tool according to claim 5, characterized in that: a core tube seal (9) is provided at the place where the center tube (3) is seated on the main shaft (1).