RU85939U1 - Cementing Head - Google Patents

Abstract

A cementing head comprising a housing with a lid, sufficient free space to accommodate the plug, nozzles connected to the super-pilot and sub-pilot space of the housing, characterized in that it further comprises a ball valve located below the plug and above the pilot-plug.

Description

The utility model relates to the mining industry, namely to the attachment of oil and gas wells.

It is known "Device for cementing casing strings" PM RU 33394 [1], comprising a housing with side bends, a connection unit with a casing string, the housing of the device is divided by a ball valve into the upper and lower parts, and in the upper part of the housing there is a side outlet for water supply into the unit’s measuring unit, and in the lower part - a lateral branch for connecting the discharge and discharge lines of the units.

A disadvantage of the known design is the inability to lower the squeeze plug at the wellhead.

Closest to the claimed technical solution is the utility model “Cementing head for drill pipes” RU 40382 [2], comprising a housing with a lid, a retainer for holding plugs and nozzles connected to the super-cork and sub-casing space of the body.

The disadvantage of the design [2] is the reduced quality of cementing, due to the increased complexity of controlling the gathering of cork and, as a consequence, the increase in cementing time. A disadvantage of the known design is also a reduced degree of sealing between the over-cork and under-cuff spaces, which leads to a decrease in the service life of the equipment and a decrease in the quality of cementing work.

The technical result of the proposed utility model is to improve the quality of cementing, to increase the degree of sealing between the over-cork and under-cube spaces.

The technical result is achieved by the fact that the cementing head further comprises a ball valve located below the cork and above the cork pipe.

The proposed design is shown in figure 1 General view, where:

1 - housing;

2 - cover;

3 - cleaning plug;

4 - overhead pipe;

5 - cork pipe;

6 - ball valve;

7 - overhead crane;

8 - pilot valve;

9 - wellhead;

10 - elevator;

11 - flow direction from the cementing unit;

12 - flow direction at the wellhead.

The cementing head consists of a housing 1 with a cover 2, into which a cleaning plug 3 is installed. Connected to the housing: a super-pipe 4, a pilot-pipe 5. A ball valve 6 is located below the cork and above a pilot-pipe 6. A super-pipe 7. is attached to the super-pipe 4 to the cork pipe 5, a cork valve is connected 8. The cementing head is connected with the elevator 10 with the upper part, and with the mouth 9 with the lower part.

The operation of the cementing head:

The cleaning plug 3 is installed in the cementing head before cementing the well. The cementing head is captured by the elevator, installed on the wellhead 9 (connected to the drilling tool using a drill key). After connecting to the drilling tool, the cementing head is tied to the cementing unit.

To pump buffer fluid and cement into the well, a sub-pilot valve 8. opens. The super-pilot valve 7 remains in the closed position. The ball valve 6, preventing the premature exit of the cleaning plug 3, also remains in the closed position.

After pumping cement into the well to clean the drilling tool and displace the cement into the annulus, it is necessary to open the super-pilot valve 7 and the ball valve 6, and close the sub-pilot valve 8. Squeezing fluid is supplied from the cementing unit to the well, the direction of movement of which is indicated by arrow 11, which, passing through the cementing head, pushes a cleaning plug in front of the wellhead, the direction of movement is shown by arrow 12.

Improving the quality of cementing is achieved by simplifying and accelerating the control of cork gathering. To exit the cork, just turn the tap.

Increasing the degree of sealing between the super-pilot and under-pilot spaces by using a crane leads to an additional improvement in the quality of cementing due to the complete absence of mixing of liquids in the head.

The expansion of technological capabilities is due to the possibility of continuous supply of fluid to the well.

Industrial application. The utility model can be successfully applied in the oil and gas industry.

Claims (1)

A cementing head comprising a housing with a lid, sufficient free space to accommodate the plug, nozzles connected to the super-pilot and sub-pilot space of the housing, characterized in that it further comprises a ball valve located below the plug and above the pilot-plug.