SU1500787A1

SU1500787A1 - Method of monitoring outburst hazard of coal seams

Info

Publication number: SU1500787A1
Application number: SU874197592A
Authority: SU
Inventors: Aleksandr I Kramarenko; Nikolaj E Voloshin
Original assignee: Kramarenko Aleksandr; Nikolaj E Voloshin
Priority date: 1987-01-07
Filing date: 1987-01-07
Publication date: 1989-08-15

Description

Изобретение относится к горной промышленности, в частности к технике безопасности в угольных шахтах, разрабатывающих пласты, опасные по газодинамическим явлениям, и может быть использовано при осуществлении способов предотвращения внезапныхThe invention relates to the mining industry, in particular to safety in coal mines, developing layers, dangerous for gas-dynamic phenomena, and can be used in the implementation of ways to prevent sudden

Изобретение относится к горной промышленности, в частности к технике безопасности в угольных шахтах,- разрабатывающих пласты, опасные по газодинамическим явлениям, и может быть использовано при осуществлении способов предотвращения внезапных выбросов угля и газа, а также горных уда-’· ров на газоносных угольных пластах.The invention relates to the mining industry, in particular to safety in coal mines, developing layers, hazardous for gas-dynamic phenomena, and can be used in the implementation of methods to prevent sudden emissions of coal and gas, as well as mining blows on gas-bearing coal seams .

Цель изобретения - повышение эффективности оценки выбросоопасности призабойной зоны пласта путем учета изменения газового состояния призабойной зоны пласта в процессе изменения ее напряженного состояния приThe purpose of the invention is to increase the efficiency of estimating the outburst hazard of the bottomhole formation zone by taking into account changes in the gas state of the bottomhole formation zone in the process of changing its stress state during

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выбросов угля и газа, а также горных ударов на газоносных угольных пластах. Цель изобретения - повышение эффективности оценки выбросоопасности призабойной зоны пласта путем учета изменения газового состояния призабойной зоны пласта в процессе изменения ее напряженного состояния.emissions of coal and gas, as well as rock bursts on coal gas strata. The purpose of the invention is to increase the efficiency of estimating the outburst risk of the bottomhole formation zone by taking into account changes in the gas state of the bottomhole formation zone in the process of changing its stress state.

До начала выполнения противовыбросных мероприятий бурят контрольные шпуры (ШП) на расчетную глубину. Монтируют в ШП устройство для замера скорости газовыделения (СГ) у забоя, устройство для измерения смещений (СМ) призабойной зоны, ведут одновременно непрерывно замер СГ и СМ в течение оPrior to the start of execution of the blowout preventive measures, control holes (BF) are drilled to the design depth. The device for measuring the rate of gas evolution (SG) at the face, the device for measuring displacements (CM) of the bottomhole zone, is mounted in the NB, simultaneously the SG and SM are measured continuously for about

всего времени выполнения противовыбросных мероприятий и, если одновременно увеличиваются СГ и СМ пласта не менее чем на 15% по сравнению с первоначальным, зону пласта относят к невыбросоопасной.the total execution time of the blowout preventive measures and, if the SG and SM of the reservoir simultaneously increase by no less than 15% compared to the initial one, the zone of the reservoir is referred to as non-hazardous.

применении противовыбросных мероприятий.use of blowout preventive measures.

Способ осуществляют следующим образом.The method is as follows.

До начала выполнения противовыбросных мероприятий в призабойной зоне угольного пласта в зоне влияния противовыбросных мероприятий бурят контрольные шпуры, например, при использовании в качестве противовыбросного мероприятия гидрорыхления. Контрольный шпур бурят на расстоянии от нагнетательных скважин, не превышающем эффективный радиус их влияния, но не ближе одного метра отPrior to the start of execution of the blowout preventive measures in the near-wellbore zone of the coal seam, control holes are drilled in the zone of influence of the blowout preventive measures, for example, when hydrofluorization is used as the blowout preventer. The control hole is drilled at a distance from the injection wells, not exceeding the effective radius of their influence, but no closer than one meter from

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этих скважин. Глубину бурения шпуров принимают равной глубине, на которой появляются первые значения газовыделения, плюс 0,5-0,7 м. .these wells. The depth of drilling of bore-holes is assumed to be equal to the depth at which the first values of gas evolution appear, plus 0.5-0.7 m.

После окончания бурения шпура на расчетную глубину, монтажа устройства для замера скорости газовыделения и его герметизации монтируют устрой1500787After the drilling of the hole has been completed, the mounting depth of the device for measuring the rate of gas evolution and its sealing will be mounted on the device1500787

Claims

Claim

The method of controlling the outburst hazard of coal seams, including drilling in the bottomhole zone when performing blowout measures of control holes, sealing them and measuring the gas release rate in

for measuring the shifts of the bottom of each of these 10 holes, a comparison of the obtained

Formation zone, for example, in the form of a strut with a reading device of the roof displacements - the formation soils in the area of the control hole, simultaneously measure the rate of gas evolution and the bottomhole zone of the coal seam. The control of these parameters is carried out continuously throughout the entire execution time against the oversampling measures.

The process of preventive effects on the reservoir is considered complete and effective in eliminating outburst hazard in the bottomhole formation zone if at the beginning of the use of anti-blowout measures there was a simultaneous increase in gas release rate and displacement rate of the reservoir by at least 15% compared to the initial one, and then the process of changing these parameters stabilized (ie, the zone of the reservoir referred to non-hazardous).

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the magnitude of the gas release rate with the initial and estimated at these values of the outburst hazard level of the coal seam, characterized in that, in order to increase the effectiveness of the outburst hazard assessment by taking into account the change in the slot state of the bottomhole formation zone during the change of its stress state when applying blowout measures, drill holes are drilled in the area of conducting the blowout preventive measures and simultaneously with the measurements of the rate of gas evolution in them measure the rate of displacement of the process My anti-blowout measures at the coal-well bottom zone and with ^: increasing the displacement rate of the specified zone and the gas release rate at the same time by at least 15% with their further stabilization in comparison with their initial values are referred to as non-hazardous.