CN206647066U - A kind of well top driving mechanism hydraulic pressure pushing type rubber seal washing pipe assembly - Google Patents

Abstract

The utility model discloses a kind of well top driving mechanism hydraulic pressure pushing type rubber seal washing pipe assembly, including top assembly and bottom assembly, the external diameter of the top assembly and the bottom assembly is supporting with top-drive device installation place size.The utility model has advantages below：Simple in construction, easy to process, cost of investment is low；Application prospect is good, can be supported the use with active service well drilling top drive；Hydraulic thrust supports the use by power with rubber seal, realizes that complicated target is reviewed one's lessons by oneself in sealing, ensures the strict sealing of instrument, reduce and repair downtime, improve operation timeliness, is escort safely for underground work.

Description

A hydraulic pushing type rubber seal flushing pipe assembly of a drilling top drive device

technical field

The utility model relates to the technical field of drilling engineering for resources such as oil and natural gas, in particular to a hydraulic pushing type rubber seal flushing pipe assembly of a drilling top driving device.

Background technique

During the drilling operation, the drilling fluid needs to be transported through the gooseneck, the flushing assembly, the main shaft, and the inner hole of the downhole drill string to the bottom of the well to carry cuttings back out of the wellbore. The top drive flushing pipe assembly acts as a bridge connecting the hose and the top drive main shaft, which not only realizes the continuous transmission of drilling fluid, but also realizes the transition from the static state (gooseneck) to the rotating state (main shaft). Therefore, the top drive flushing pipe The assembly is a major wearing part that needs to be disassembled and replaced frequently. In order to ensure that the high-pressure drilling fluid has a smooth flow path, the upper and lower parts of the flushing pipe assembly need to be fastened to the gooseneck and the shaft end of the main shaft respectively; in order to ensure that the internal high-pressure drilling fluid does not leak out during rotation, sufficient pressure The flushing pipe assembly is compressed and fixed by the tightening force to form a strictly sealed state. At present, there are two types of flushing pipe assembly at home and abroad: packing seal and mechanical seal flushing pipe assembly.

The flushing pipe seal belongs to the high-pressure dynamic sealing structure. All the working pressure of the packing seal flushing pipe is concentrated on the sealing ring, which is very easy to seal failure, especially in the well section where oil-based drilling fluid is used. Due to the poor heat dissipation and high temperature of oil-based drilling fluid, High viscosity, strong corrosion to packing seal, easy to deform and cause puncture leakage. According to statistics, in the well section where oil-based drilling fluid is used in an oilfield in the west of the South China Sea, the average use time of packing seal flushing pipe is only 40 hours, which seriously restricts the operation timeliness. Bring serious hidden danger to underground safety. For the mechanical seal flushing pipe, domestic manufacturers have produced it, but the cost is too high, and the disassembly and installation process is complicated, requiring a large operating space. At the same time, due to the small number of spring compensation devices and insufficient balance, frequent shaking is caused. In less cases, the puncture and leakage are very serious, which seriously restricts the time limit for operation.

To sum up, there is an urgent need for a utility model with a simple structure, convenient processing and capable of sealing and self-repairing the flushing pipe, ensuring the service life of the top drive flushing pipe assembly, so as to ensure the safety of downhole operations, improve operating efficiency, and reduce operating costs.

Utility model content

In view of the above-mentioned problems, the utility model aims to provide a hydraulic pushing type rubber seal flushing pipe assembly of a drilling top drive device.

In order to achieve this technical purpose, the solution of the present utility model is: a hydraulic pushing type rubber seal flushing assembly of a drilling top drive device, including an upper assembly and a lower assembly, the upper assembly and the lower assembly The outer diameters are matched with the size of the top drive installation. The utility model has the following advantages: simple structure, convenient processing, low investment cost; good application prospect, can be matched with active drilling top drive; hydraulic push force and rubber seals are used together to achieve the goal of self-repairing of the seal and ensure the strictness of the tool. Sealing, reducing downtime for repairs, improving operational efficiency, and escorting the safety of underground operations.

As a preference, the upper assembly includes an upper union, a rubber seal, a sealing sleeve, and an o-ring; the upper end of the upper union is connected to the gooseneck through the upper union thread and the gooseneck is threadedly sealed, and the thread size is the same as The thread size of the gooseneck is matched; there is a hydraulic oil chamber inside, which is used to install rubber seals and sealing sleeves. There is a hydraulic oil injection hole at the lower end of the hydraulic oil chamber, and a check valve is attached to realize the injection and non-return of hydraulic oil. and pressure relief; the inner diameter of the upper union matches the outer diameter of the central tube of the upper assembly to form a dynamic seal that can rotate relatively; the rubber seal is wedge-shaped and installed in the upper union hydraulic oil chamber, and its inner diameter It matches with the outer diameter of the central tube to form a dynamic seal, which can be rotated relatively. The rubber seal is pushed against the central tube wall by hydraulic pressure to achieve a strict sealing goal; the sealing sliding sleeve and the rubber seal are matched and installed on the upper union hydraulic oil The cavity, whose inner diameter matches the outer diameter of the central tube, forms a dynamic seal and can rotate relatively; the o-shaped sealing ring is mainly installed on the contact surface of each component to strengthen the sealing effect.

As a preference, the lower assembly includes a lower union, a rubber seal, a sealing sleeve, and an o-ring; the lower end of the lower union is connected to the main shaft through the lower union thread and the main shaft through a threaded sealing connection, and its thread size is the same as that of the main shaft. The thread size is matched, and there is a large hydraulic oil chamber inside, which is used to install 2 to 4 sets of rubber seals and sealing sleeves. 2 to 4 injection holes with check valves are opened at the corresponding positions on the outer wall of the lower union to realize each small Injection, non-return and pressure relief of hydraulic oil in the hydraulic oil chamber; the inner diameter of the lower union matches the outer diameter of the central tube to form a static seal and prohibit relative rotation; the rubber seal is wedge-shaped and installed in the lower union hydraulic oil chamber , its inner diameter matches the outer diameter of the central tube to form a static seal, prohibiting relative rotation, and the rubber seal is pushed against the central tube wall by hydraulic pressure to achieve a strict sealing goal; the sealing sliding sleeve and the rubber seal are installed in the lower union The inner diameter of the hydraulic oil chamber matches the outer diameter of the center pipe to form a static seal and prohibit relative rotation.

The utility model has the following advantages: simple structure, convenient processing, low investment cost; good application prospect, can be matched with active drilling top drive; hydraulic push force and rubber seals are used together to achieve the goal of self-repairing of the seal and ensure the strictness of the tool. Sealing, reducing downtime for repairs, improving operational efficiency, and escorting the safety of underground operations.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1-upper union thread; 2-upper union; 3-rubber seal; 4-o-type sealing ring; 5-center pipe; 6-injection hole with check valve; 7-hydraulic oil chamber; 8-Sealing sliding sleeve; 9-Lower union; 10-Lower union thread.

detailed description

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

As shown in Fig. 1, a kind of drilling top drive device hydraulic pressure pushing type rubber seal flushing pipe assembly of the best specific embodiment of the present utility model includes an upper assembly and a lower assembly, and the upper assembly and the The outer diameter of the lower assembly is matched with the size of the installation place of the top drive unit. The utility model has the following advantages: simple structure, convenient processing, low investment cost; good application prospect, can be matched with active drilling top drive; hydraulic push force and rubber seals are used together to achieve the goal of self-repairing of the seal and ensure the strictness of the tool. Sealing, reducing downtime for repairs, improving operational efficiency, and escorting the safety of underground operations.

Preferably, the upper assembly includes an upper union 2, a rubber seal 3, a sealing sleeve 8, and an o-ring 4; the upper end of the upper union passes through the upper union thread 1 and the gooseneck Thread sealing connection, the thread size matches the gooseneck thread size; there is a hydraulic oil chamber inside, which is used to install rubber seals and sealing sleeves. There is a hydraulic oil injection hole at the lower end of the hydraulic oil chamber 7, with a check valve, which can Realize injection, non-return and pressure relief of hydraulic oil; the inner diameter of the upper union matches the outer diameter of the central tube 5 to form a dynamic seal and can rotate relatively; the rubber seal is wedge-shaped and installed in the upper union hydraulic oil chamber , its inner diameter matches the outer diameter of the center tube to form a dynamic seal, which can be rotated relative to each other. The rubber seal is pushed against the wall of the center tube by hydraulic pressure to achieve a strict sealing goal; the sealing sliding sleeve is matched with the rubber seal and installed on the The non-hydraulic oil chamber, whose inner diameter matches the outer diameter of the central tube, forms a dynamic seal and can rotate relatively; the O-ring is mainly installed on the contact surface of each component to strengthen the sealing effect.

As a preference, the lower assembly includes a lower union 9, a rubber seal 3, a sealing sleeve 8, and an o-ring 4; the lower end of the lower union is threadedly sealed with the main shaft through the lower union thread 10 Connection, the thread size matches the spindle thread size, there is a large hydraulic oil chamber inside, which is used to install 2~4 sets of rubber seals and seal sliding sleeve combinations, and 2~4 holes with check are opened at the corresponding positions on the outer wall of the lower union The valve injection hole 6 realizes the injection, check and pressure relief of hydraulic oil in each small hydraulic oil chamber; the inner diameter of the lower union matches the outer diameter of the center pipe to form a static seal and prohibit relative rotation; the rubber seal is wedge-shaped , installed in the hydraulic oil chamber of the lower union, whose inner diameter matches the outer diameter of the central tube to form a static seal, prohibiting relative rotation, and pushes the rubber seal against the central tube wall through hydraulic pressure to achieve strict sealing goals; the sealing sliding sleeve and The rubber seal is installed in the hydraulic oil chamber of the lower union, and its inner diameter matches the outer diameter of the center pipe to form a static seal and prohibit relative rotation.

The utility model has the following advantages: simple structure, convenient processing, low investment cost; good application prospect, can be matched with active drilling top drive; hydraulic push force and rubber seals are used together to achieve the goal of self-repairing of the seal and ensure the strictness of the tool. Sealing, reducing downtime for repairs, improving operational efficiency, and escorting the safety of underground operations.

The purpose of this utility model is achieved through the following technical solutions:

1) install

①Install the rubber seal and the sealing sliding sleeve in the upper and lower inner chambers of the union respectively as required;

② Install the o-ring on the designated contact surface for sealing;

③Connect the upper and lower unions with the central tube;

④ Seal the connection thread of the upper union with the connection thread of the gooseneck;

⑤ Connect the connecting thread of the lower union with the connecting thread of the main shaft in a sealed connection.

2) Injection pressure

①Connect the hydraulic pipeline connector of the top drive hydraulic system to the injection holes of the upper and lower unions with check valves;

② Inject hydraulic oil into the upper and lower union hydraulic oil chambers according to the standard, and the hydraulic pressure reaches the specified value;

③Remove and fix the hydraulic pipeline connected to the injection hole of the lower union with check valve.

3) Pressure relief

① After the operation is finished, connect the top drive hydraulic pipeline to the injection hole of the lower union with check valve;

②Relieve the pressure in the upper and lower union hydraulic oil chambers according to the operation requirements.

4) Disassembly

① After pressure relief, disengage the top drive hydraulic pipeline from the injection holes of the upper and lower unions with check valves and fix them;

② Disassemble the upper union and gooseneck;

③ Disassemble the lower union from the main shaft;

④ Remove the central tube;

⑤Remove the rubber seals, sealing sleeves and O-rings inside the inner cavity of the upper and lower unions.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any minor modifications, equivalent replacements and improvements made to the above embodiments according to the technical essence of the present utility model shall be included in the Within the scope of protection of the technical solution of the utility model.

Claims (3)

1. A kind of 1. well top driving mechanism hydraulic pressure pushing type rubber seal washing pipe assembly, it is characterised in that：Including top assembly It is supporting with top-drive device installation place size with bottom assembly, the external diameter of the top assembly and the bottom assembly.
2. 2. well top driving mechanism hydraulic pressure pushing type rubber seal washing pipe assembly according to claim 1, its feature exist In：The top assembly includes upper union, rubber seal, sealing sliding sleeve, o type sealing rings；

   The upper union upper end is connected by the upper union connection screw thread with gooseneck by thread seal, thread size and goose Neck tube thread size is supporting；There is hydraulic fluid chamber inside, and for installing rubber seal and sealing sliding sleeve, hydraulic fluid chamber lower end is provided with One hydraulic oil hand-hole, subsidiary check-valves, can be achieved injection, non-return and the release of hydraulic oil；The upper union internal diameter and institute The central tube external diameter matching of top assembly is stated, dynamic sealing is formed, can relatively rotate；

   Into wedge-like, installed in upper union hydraulic fluid chamber, its internal diameter matches the rubber seal with central tube external diameter, is formed dynamic close Envelope, can relatively rotate, abut center tube wall by rubber seal by hydraulic thrust, realize strict target seal；

   The sealing sliding sleeve with rubber seal is supporting is arranged on upper union hydraulic fluid chamber, its internal diameter matches with central tube external diameter, Dynamic sealing is formed, can be relatively rotated；

   The o types sealing ring is mostly installed on each component contact face, for strengthening sealing effectiveness.
3. 3. well top driving mechanism hydraulic pressure pushing type rubber seal washing pipe assembly according to claim 1, its feature exist In：The bottom assembly includes lower union, rubber seal, sealing sliding sleeve, o type sealing rings；

   The lower union lower end is connected by the lower union connection screw thread with main shaft by thread seal, its thread size and master Axle thread size matches, and there is a big hydraulic fluid chamber inside, for installing 2~4 sets of rubber seals and sealing sliding bush combination, 2~4 band check-valves hand-holes are opened in lower union outer wall relevant position, realize injection, the non-return of each small hydraulic fluid chamber hydraulic oil And release；The lower union internal diameter matches with central tube external diameter, forms static seal, forbids relatively rotating；

   Into wedge-like, installed in lower union hydraulic fluid chamber, its internal diameter matches the rubber seal with central tube external diameter, is formed quiet close Envelope, forbids relatively rotating, abuts center tube wall by rubber seal by hydraulic thrust, realize strict target seal；

   The sealing sliding sleeve with rubber seal is supporting is arranged on lower union hydraulic fluid chamber, its internal diameter matches with central tube external diameter, Static seal is formed, forbids relatively rotating.