SU1254136A1 - Method of drilling wells - Google Patents

Abstract

The method of drilling wells, including the destruction of rock, cleaning the basement from air by air, with variable weight flow, from latching so that, d, to ensure the safety of drilling in gas-dynamic coal seams by adjusting the level of methane in the air circulating in the well-e is sent back to the well, the methane-air mixture flowing from it, which is sufficient for the lower flammability limit in the methane content, and reduces the weight flow of air supplied to the well by y, equal to the weight flow rate of the methane – air mixture emanating from the well, and when the methane content in it reaches the level of a neutral gas medium, air is supplied to the well in a discrete mode of pressure. t1 (L hp SP {aii oe

Description

"1.2541

The invention relates to a mountain spruce, namely, a drill on wells with a gas discharge of a gas-active various washing agent in gas-dynamic coal seams with a high gas content, 5 bg-ynnost.

The aim of the invention is to ensure the safety of drilling in gas-dynamic formations by regulating the level of methane in an air mixture circulating through the well.

The drawing shows a flow chart of drilling in gasdynamic coal seams with cleaning of sludge with a gaseous promoter agent for the sludge, explaining the method

E.SLI methane content in the outflow from the wells, the methane-air mixture does not reach the lower limit, 20 flammability, compressed air 1 from the compressed air through the supply main pipeline, on which interruptions are installed, 2 and 3 , gas: flow meter 4, 25 5, methane gauge 6 and zadezhka-interrupt-tel Y, is fed into the drilling rig 8, which is transmitted by rotary-translational motion by the drilling machine 9. Outgoing from the well, live gas-30 coal inlet flow. em in the sealer ust 10, which is installed on the casing pipe P, In the airtizer mouth 10 from the pump .12 with the open valve-interrupter 3 and from the jj container with the surfactant metering dispenser 4 with the open valve: e-transducer 15, water enters with a wetting agent of the type DB through an inlet line, in which water flow meter installed 16. ° 40

After dust suppression in the sludge outlet channel of the sealer 10, the sludge-and-gas flow enters the diverting master, in which the damper settler 1 7 is installed — 45 separator 18, from which water and gaps are removed by periodically opening the gate valves. . V9 and 20. The purge of water and the gas – gas mixture’s purge goes further along a tap - a main line, in which a methane meter 21, a manometer 22, a gas flow meter 23 and a chopper 24 are installed, through which the gas mixture is discharged into atmosphere of mine workings. Through valve 2.5, the mixture is discharged into the degassing pipeline. Operations to remove stubs and water from

36 .2

The gallam separators 18 should coincide with the operations for increasing the drill stem and should not have a significant effect on the change in the weight flow rate of the circulating gas.

With a periodic increase in the concentration of methane in the outgoing flow, it is possible to increase the weight flow rate of compressed air, ir by no more than 25%. At higher concentrations of methane, dilution of the mixture is excluded, since this would require an increase in the weight consumption of the washing agent by 1.5–2 or more.

If the concentration of methane in the gas mixture coming out of the well determines the lower flammability limit of the gaseous medium, the interrupter valve 24 is crossed and the gas flow is directed along a continuous line, the interrupter valve 26 and the source 27 are installed. creating a discrete value of the pressure of the flow in the supply m, agistr; al,

As source 27 for creating discrete in magnitude pressure flow, it is possible to use a conventional compressor with a small flow rate, but higher pressure than the main controller can develop.

It is not necessary to switch on the source 27 continuously after reaching the level of the neutral gas environment, it may be periodically turned on as needed.

Further, the gas flow is circulated according to the described system. At the same time, with the help of the chopper valve 2, the weight flow rate of compressed air supplied to the well is reduced by an amount equal to the weight flow rate of the methane-air mixture coming from the wellbore to the supply line. Within a short period of time, due to the fact that a large amount of methane is released during the drilling process, the methane-air mixture coming from the well becomes a neutral medium. The further drilling process is continued by supplying a gaseous flushing agent to the well in a discrete pressure regime, carried out using source 27. This is done in order to maintain the level of meth3

in the mixture by stimulating methane emissions from the walls of the well and to improve the cleaning of the well of blunt, drilled and evolved as a result of gas-dynamic formation activity.

As an excess gas mixture with a high methane content appears in the well, valve 25 periodically opens and the mixture is discharged into the degassing pipeline. A gas mixture with a high content of methane is discharged into the degassing stage by the end of the drilling process.

To implement the proposed drilling method, it is sufficient to use commercially available equipment and instrumentation equipment, for example, drilling machines BJ00-200 with a set of technologies Compiled by E.Stolbtsov Editor K. Voloshchuk Tehred I.Popovich Proofreader M.Pogo

4695/35

Circulation 5A8Signature

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

1364

The equipment - sealing device Ust-type UDS-2, manometers type MKO or MKL, flowmeters type DP, metanometer-recorders type M-100. When implementing the proposed drilling method, the installation of drilling equipment: 1 It is proposed to produce the wells to the wells in the absence of high methane emissions without using known technological methods and modes of destruction and cleaning.

The duration of operations to create non-flammable mixtures and to maintain a neutral gas environment at the bottom of a well is different and depends on the gas-mass distribution and the stighening of the out-of-danger of the reservoir. Safe drilling is achieved by adjusting the methane content of the gas ditch circulating in the well.

Claims (1)

A method of drilling wells, including the destruction of rocks, cleaning the well of sludge with air supplied with a variable weight flow rate, distinguished by the fact that, with a chain, to ensure the safety of drilling in gas-dynamic coal seams by controlling the level of methane content in the air stream circulating through the well, they direct back to the well emanating from it a methane-air mixture that has reached a lower flammability limit in terms of methane content and reduce the weight consumption of the air supplied to the well by Equal to the weight flow outbound from the hole methane-air mixture, and when the level therein methane neutral <g gaseous medium produce air flow into the well in discrete pressure value of mode.