SU1232823A1 - Method and apparatus for determining gas-bearing capacity of mineral - Google Patents

Abstract

1. A method for determining the gas content of a mineral, including interval drilling of a well and its sealing, measuring the time of drilling of each well interval and the time of stabilization of gas release, measuring the gas flow rate after the end of drilling of each well interval. determination of the residual gas content of shtyb, in contrast to the fact that, in order to reduce the time and increase the accuracy of determining the gas content of the mineral, when sealing the well leaves a twisted drill rod in it, measures the time from the end of the drilling of the well interval to the beginning of the gas flow measurement, start the flow rate of the gas to measure no later than 20 seconds after the end of the drilling of the well interval, and periodically intermediate gas debits and the duration of intervals between these measurements, while the gas content of mineral X at any interval of the well is calculated using the formula, 5ts (K3, -3,). 2 :: j; At; -l ,, t, dry ashless masses where Hd - residual gas content of shtyb, taken at a depth of 3-4 m, ash-free dry mass, the time, respectively, of drilling the interval of squamble and stabilization of gas-gas; Ш1н; J., - gas flow rate at the beginning of gas emission measurement, l / min; g is the gas flow rate at the time of termination of the measurement of gas emission, l / min; ; - intermediate gas flow rates, l / min; time intervals between measurements of intermediate gas debit, min; shtyb out of the well interval, kg; k 1 + + 0.003tj- factor1 {ent, taking into account the arising of the delay time of the first measurement of the gas flow rate; at; m si s N0 y 30 Yuo

Description

i is the time from the end of the drilling of the well interval to the beginning of the gas flow measurement,.

2. Method POP.1, which differs from the fact that the gas flow rates during the period of stabilization of the gas section are measured discretely at intervals of not more than 10 s,

3. A device for determining the gas content of the useful and the copious,

The invention relates to the mining industry and can be used in the development of gas-bearing minerals, including coal-mining coal hazardous layers.

The purpose of the invention is to reduce the time and increase the accuracy of determining the gas content of the mineral.

The drawing shows a device for sealing a squash without removing the twisted drill rod from it when determining the gas content.

The device consists of a hollow elastic cuff 1, made, for example, of a rubberized fabric and made into an isosceles triangle with a ratio of its height to the base of 1: 3-1: 5, pressure 2 and gas outlet 3 tubes connected to the cuff closer to the base and located at an angle (90-p) to the longitudinal axis of the cuff, where p is the angle of inclination of the screw to the longitudinal axis of the drill rod, the discharge tube communicating with the internal magnetotum, and the venting tube passing through the cuff, tee 4, pressure gauge 5,: nip sang 6 with a hand pump 7, a gas meter (flow meter) 8.

The prior method for determining the gas content of a mineral is carried out as follows.

In the bottom hole, a well is drilled with a diameter of, for example, 42-45 mm and a depth of 1.5 m with a constant feed rate of the drilling tool of approximately 1 m / min. At the same time, the drilling time (tg) is fixed, for example, the last met2823

including hollow elastic cuff, pump, injection and gas exhaust pipes, pressure gauge, tee, nipple and gas meter, about the same angle with the pressure and gas exhaust pipes with a longitudinal axis of the hollow cuff Ы-, equal to (90-p), where / b is the angle of inclination of the screw to the longitudinal axis of the drill rod, and the gas outlet tube is passed through the cuff.

s

0

five

0

five

of the dead interval, the output of the gape (t) is measured. Then, the twisted drill stem is pulled out of squalvesin by about 0.7 m and at a distance of 0.1-0.2 m from the bottom of the plant, they are applied over the sleeve 1 with the discharge tube 2 and the gas outlet 3 attached to it so that the tubes are between the screws of the rod and wrapped around its protruding end, and the longitudinal axis of the cuff formed a right angle with the axis of the drill rod. Cuff evenly in one or two layers wound on a 10-20-centimeter area

 The drill rod, forming a tampon (packer), and the end of the cuff are tucked under tubes 2 and 3 or under the cuff layer so that it does not unwind and form local bulges, and the maximum tampon diameter is 43 mm. After that, the drill rod is removed to the bottom of the well and the pump, through the tee 4, air is forced into the cuff cavity to a pressure, for example 20-50 kPa, fixed by a pressure gauge 5. Immediately after the end of the well seal

8, for example, PG-2MA, the gas flow rate 3 is measured, the time t is recorded from the moment of the end of drilling the well interval to the beginning of the measurement of gas rate 1, and the gas flow rate p is determined at the time of the end of the well interval by

, (1 + 0.003 t,), l / min.

The time t. Should not exceed 20 s, otherwise the error of determining the division of Jjj will exceed 10% and will increase exponentially (at t, 40 - 50 s, the error will exceed 30%), which will lead to a significant decrease in reliability and accuracy gas content of the reservoir.

After 5-10 s after measurement 3, every subsequent 5-10 s during gas stabilization time tg 3-5 min, gas flow rates C are measured, time intervals At are recorded between the measurements J, and gas-gas stabilization time t, while t 2G U t, + t min measure the stabilized gas flow rate J and calculate the amount of gas released from the newly drilled well hole during the stabilization period i of the gas extract by the formula

V Z3; At; + P, t, - 3, t, L

After the measurements of gas flow rates from the cuff cavity are completed, air is released with the help of nipples 6, the drill rod is pulled out of the well approximately 0.7 m and the cuff is removed from it. Then for about 1 min. At a constant feed rate of about 1 m / min, the next well interval is drilled and all the indicated operations are performed.

The end of the drilling of the well; the depths of the depths determine the gas content of the formations at different distances from the bottom of the mine by the formula

232823, 4

X, 5 tj (K.l, -3) +

+ Zj; bt; -;, tj, MVT 5 ash free mass,

about

where X is the residual gas content

shtyb, selected at a depth of 3-m m ash-free dry mass;

tg and t — time, respectively, for drilling the interval of the well and stabilizing the gas-bleaching, min;

Ji flow rate; aza at the beginning of the measurement of gas evolution, l / min; c is the gas flow rate at the moment of termination of the measurement of gas, l / min; intermediate gas flow rates

l / min;

LS; - time intervals between measurements of intermediate gas flow rates, min; m - exit of the stub from the interval

wells, kg; K 14- + 0,003t- coefficient taking into account 1-1

lag time of the first measurement of the gas flow rate;

t is the time from the end of the drilling interval of the well to the beginning of the gas flow measurement, M1Sh.

Editor A. Kozoriz

Compiled by M.Gagulin Tehred L. Serdyukova

Order 2749/34 Circulation 436Subscription

- VNIIPI USSR State Committee

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

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

Proofreader L. Patay

Claims (3)

1. The method of determining the gas content of the mineral, including interval drilling of the well and its sealing, measuring the drilling time of each well interval and the time of stabilization of gas evolution, measuring the gas flow rate after the end of drilling each interval of the well. gas content of shtyb, which is characterized by the fact that, in order to reduce the time and increase the accuracy of determining the gas content of the mineral, when sealing the well they leave a twisted drill rod in it, measure the time from the end of the drilling interval of the well to the beginning of the measurement of gas flow rate, gas flow rate begin to measure no later than 20 s after the end of the drilling interval of the well, and in the process of stabilization of gas evolution periodically measure the intermediate flow rates of the gas and the duration of the intervals between these measurements, while the gas content of the mineral X at any interval of the well is calculated by the formula Χ - Χ ₀ [θ, 5ί ₅ (κ3, -1 _ε ) ₊ Σ: ^^; - 3Λ] ^ - ₃ '/ t, dry ash-free mass ® "five where X _about - residual gas shtyb selected on the head Bine 3-4 m, m ³ / t ash-free * dry weight; ₌ -C and ί ₀ - time, respectively, the storm- ~ interval well and 1c stabilization of gas; R min; | And 3., - gas flow rate at the beginning of the measurement of gas evolution, l / min; ς З _с - gas flow rate at the moment of gas emission measurement completion, ς l / min; 3; - intermediate gas flow rates, l / min; D (- time intervals between measurements debi- intermediate gas comrade ¹ min; go - exit of shtyb from the well interval, kg; k = 1 + + 0,003ί ₅ - coefficient taking into account lag time of the first measurement of the gas flow rate; 1232823 + - time since the end interval drilling before the start of flow measurement gas min 2. The method according to claim 1, that is, that the gas flow rates during the gas emission stabilization period are measured discretely at intervals not exceeding 10 s. 3. A device for determining the gas content of a mineral, including hollow elastic cuff, pump, injection and exhaust pipe, pressure gauge, tee, nipple and gas meter, characterized in that the injection and exhaust pipe form an angle ΰί with the longitudinal axis of the hollow cuff. equal to (90- β) °, where β is the angle of inclination of the screw to the longitudinal axis of the drill rod, and the exhaust pipe is passed through the cuff. one