SU1191571A1 - Wellhead sealing device - Google Patents

Description

The invention relates to the mining industry and can be used for dust suppression when drilling wells with the removal of the drilling. little things with compressed air in the ejection - 5 dangerous coal seams.

The purpose of the invention is to increase the safety and efficiency of dust suppression during drilling in outburst coal seams by supplying water 10 to the swirlers.

The drawing shows a schematic seal of the wellhead, a longitudinal section.

The wellhead sealant includes-15 includes a housing 1 with sealing elements 2, a sludge outlet 3, flow swirls 4-6, swirl diffusers 7-9, tangential nozzles (inputs) with preliminary twisting flow 10-12, a safety chamber 13, a mixing chamber 14, a connecting pipe 15, a pshamootvootnaya line 16 and a high-pressure water pump. 25

Sealer wellhead works as follows.

Simultaneously with the start of drilling, high-pressure water is included. a pump and water with a 30 DB type wetting agent, which is used to increase the ‘Dust suppression effect, is supplied through tangential nozzles 10–12 to swirls 4–6, where a high-speed 3 $ rotational motion is communicated to the water flow. From the swirl 4, the water flow enters the diffuser 7 and the safety chamber 13, from where it is discharged through the connecting pipe 15 to the sludge outlet 16. If a sudden discharge occurs during drilling and the coal block penetrates through the sealing elements 2, it enters directly into the safety chamber 13, from which is removed by a high-speed water flow through the connecting pipe 15 to the sludge outlet 16. From the swirlers 5 and 6, water flows, which are rotated in the opposite direction, h Res diffusers 8 and 9 are fed into the mixing chamber 14;

The two-phase gas-coal stream coming from the well through the sludge outlet channel 3 also enters the mixing chamber 14 and, getting between the water flows rotating in opposite directions, are intensively mixed. In the mixing chamber 14, the open flame is extinguished, if there is an ignition of the methane-air mixture or ignition of the bayonet. In addition, effective dust suppression is achieved even with an increased output of fine dust released during sudden emissions. From the mixing chamber 14, a three-phase gas-water-coal flow is removed through the sludge discharge line 16. In addition, the swirlers 4-6, which are essentially dust and fire arresters, provide reliable isolation of the well from the atmosphere of the mine workings, and improved wellhead cleaning is also achieved wells. Due to the fact that in the mixing chamber - 14 the three-phase flow rate increases, the value of which can be regulated by the flow rate of water supplied to the swirls 5 and 6, an ejection effect is created at the wellhead, which determines the timely removal of increased quantities of the pin emitted during gas-dynamic formation activity.

Adjusting the water flow rate is also necessary to ensure reliable sealing of the well, since the output of the shaft is a variable value and depends on the drilling speed and the intensity of gas-dynamic manifestations.

Claims (1)

USSR copyright certificate No. 607971, cl. E 21 C 7 / 02.1972. (5 ^) WELL MOUNT SEALER, comprising a housing with sealing elements and a sludge outlet channel, characterized in that, in order to increase the safety and efficiency of dust suppression during drilling in outburst coal seams, it is equipped with swirls with diffusers and a high-pressure water pump, with one swirling device with a diffuser is placed in the sealant housing with the formation of a safety chamber between the sealing elements, and two other swirls with diffusers are concentric and placed in the sludge outlet in the channel with the formation of the mixing chamber, the safety and mixing chambers being in communication with the sludge outlet channel, and the swirlers with the high-pressure water pump.