RU2744629C1 - Ram wellhead sealer for sealing wellhead of directional well - Google Patents

Abstract

FIELD: drilling equipment.SUBSTANCE: invention relates to wellhead equipment for wells with slanted head. Proposed is a ram wellhead sealer for sealing the wellhead of a directional well, comprised of structure installed onto a landing flange in form of consequently installed: crosspiece with closing valves, preventer with blind rams, coil, preventer with pipe rams. Wherein the resulting structure is installed onto a screw support and the preventers are controlled manually by clockwise rotation of the control wheels.EFFECT: increased reliability of wellhead sealing.2 cl, 2 dwg

Description

The proposed technical solution relates to the oil industry, in particular to methods of sealing the production string.

The known method and device for sealing the mouth of a directional well, see RF patent No. 2649205 dated 02.28.2017. This patent discloses a device for sealing the mouth of a directional well, including, installed on the zero branch pipe: a crosspiece with valves, a hydraulic ram blowout preventer, a preventer coil, a gate valve, and a transition coil. Also, the device contains a BOP steering wheel and a hydraulic station for controlling the hydraulic BOP. The device is supported by an adjustable support and secured with cable ties with a lanyard, fixed on the columns.

The disadvantage of this device is its size and weight. The weight of such equipment exceeds 6 tons, which leads to the complication of installation and dismantling of the device, as well as the use of additional structures (adjustable support and stringers) to evenly distribute the load at the wellhead. In addition, in the process of compaction of the well grid in order to increase the rate of oil production and the coefficient of the current oil recovery of the formation, it becomes necessary to increase the reliability of sealing the wellhead during drilling. The proposed technical solution allows you to eliminate the above disadvantages.

EFFECT: increased reliability of wellhead sealing.

The technical result is achieved by the fact that the wellhead ram dock for sealing the mouth of a directional well includes, installed on a column flange, a structure in the form of sequentially installed:

- crosses with shut-off valves,

- blowout preventer,

- coils,

- preventer with pipe rams.

In this case, the resulting structure is installed on a screw support, and the preventers are manually controlled by rotating the handwheels clockwise.

The structural elements of the shelter are connected by means of flange connections.

The essence of the claimed utility model and the possibility of its practical implementation is illustrated by the description and figures below.

The wellhead ram sealer allows to carry out the following: reliably and quickly seal the wellhead; create circulation of drilling mud with back pressure on the formation; to carry out walking and turning of the tool in the sealed mouth; pump the solution into the well with a drilling or cementing pump; quickly reduce the pressure in the well.

Fig. 1 and Fig. 2 show a wellhead ram dock for sealing the wellhead of a directional well (general view) and (assembly drawing), respectively.

The equipment is installed after lowering and cementing the annulus of the conductor to a depth of 50 meters and at an angle of 450 relative to the horizontal surface of the earth, see Fig. 1. We install the column flange pos. 1, then the complete equipment is installed: a crosspiece with shut-off valves pos. 2, a preventer with blind rams, pos. 3, a coil, pos. 4, a preventer with pipe dies, pos. five; coil pos. 6; preventer handwheels, pos. 7, screw support, pos. 8, shut-off valves with an extension, pos. 9.

The equipment is installed in the following sequence:

1. Near the wellhead, a pit with pits is being prepared in accordance with the design documentation.

2. A column flange, pos.1, is screwed onto the wellhead coupling.

3. A crosspiece with shut-off valves, pos. 2, a preventer with blind dies, pos. 3, a coil, pos. 4, a preventer with pipe dies, pos. 5, a coil, pos. 6, are assembled together, in advance in a specially adapted place in accordance with the design documentation. , for example, at a factory.

4. When assembled, the equipment is lowered into the pit with a crane and connected with pins to a zero branch pipe.

5. To the preventer pos. 3 and pos. 4 the handwheels pos. 7 are attached.

6. The screw support (pos. 8) and the handwheels of the shut-off valves with an extension (pos. 9) are mounted.

7. Further piping of the side branches of the wellhead ram dock is being carried out to connect the well passage with the onshore pipelines.

The equipment operates in the following way: if it is necessary to seal the canal shaft passage manually, by turning the steering wheels clockwise, the preventer rams move until they touch and, then, until sealing is achieved. In the presence of a drill string, the passage is closed by a blowout preventer with pipe rams. In the absence of a string of drill pipes, the passage is closed by a blowout preventer with blind rams, thus the wellhead is sealed. In other cases, the preventer should be in the open position - manually turning the handwheels counterclockwise, the dies are retracted to the stop.

Thanks to the proposed above design of a wellhead ram seal for sealing the head of a directional well, the following positive effects are achieved in comparison with the prototype RF patent No. 2649205 "Method and device for sealing the mouth of a directional well."

1. The mass of the device has been reduced by 2 times from 6 tons to 2.7 tons, which makes it possible to use two preventers on one device with a bore diameter of 300 mm and a working pressure of 6.3 MPa. Reducing the metal consumption of the device reduces the manufacturing cost and labor costs for installation work.

2. The device differs in that in the proposed equipment, instead of a valve, a preventer with blind rams is installed, which ensures the closure of the developing well in 25.5 turns of the steering wheel (for comparison, 44 turns when closing the valve), reduces the time for sealing the wellhead.

3. Handwheels with an extension are installed on the shut-off valves.

Overall design:

- universal, blind ram BOPs and tube ram BOPs are structurally identical and differ only in the presence of a central hole in the rams to seal the pipe;

- repairable, purchased dies and standard seals;

- mechanization is provided - rotators, simultaneously rotating them on both sides, simultaneously move both covers to the required distance, this facilitates the replacement of blind and pipe dies.

The used assembly meets all the requirements for the installation and piping of blowout equipment in wells with possible gas and oil water seepage.

Claims (7)

1. A wellhead ram sealer for sealing the mouth of a directional well, including a column structure installed on a flange in the form of sequentially installed: - crosses with shut-off valves, - blowout preventer, - coils, - blowout preventer with pipe rams, in this case, the resulting structure is installed on a screw support, and the preventers are manually controlled by turning the handwheels clockwise. 2. The hermetic sealer according to claim 1, characterized in that the structural elements of the hermetic sealer are connected by means of flange connections.

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