SU1645205A1 - Method of storing toxic brines in permafrost environment - Google Patents

Description

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(2 i) 4640735D; 3 22) 24 01 AG (46) 3004 9 Bulletin № 1G

(71) The Yak / tskiy Research and Design Institute for the Diamond-Mining

GROMY1., T STATUTES

(72) P No. Jyee NA Krasikov AM Poskhn to jA Safonov and AA A Kozeev

f53, 622 692 24 (088 8)

(56) Peomrkov R S Romanov V S Beldy M P Technologists mined salts N Nedra 1981, p 223

USSR Author's Certificate P 1435505, class B 65 G 5/00 10 12 86

(54) METHOD FOR STORING TOXIC DISCHARGES IN CONDITIONS OF MULTIPLE FROZEN

(57) The invention relates to the field of environmental protection and used

for storing toxic brines (TR) in permafrost conditions Objective - increasing storage volume due to more complete use of natural permafrost collectors (MMPs). Collecting and accumulating TPs in surface accumulators. Preparing an array of natural collectors of MMP adjacent to the mine, by pumping into the production of saturated brines. Inject TR into natural MMP collectors in areas of the massif with increased fracturing in deep faults through mining production below the basis of erosion of the surface until the termination of the spreading of the TR in the array after their freezing. Dilute the additional volume of TP to mineralization of 30–200 g / l and pump it into clay tight reservoirs located above the base of erosion, 1 sludge, 1 table

WITH

The invention relates to the protection of the environment from contamination by liquid waste, can be used for the storage of toxic brines under permafrost conditions.

The purpose of the invention is to increase the storage volume due to more complete use of natural permafrost reservoirs.

The drawing shows the storage scheme

The scheme contains a drained aquifer 1 downhole sump on the lower mining horizon of open pit 2, pumping u-tank 3 pipeline 4, intermediate} sumpf 5 vertical absorbing wells 6 and 7 of the roof of the first aquifer

horizon 8, natural reservoirs above 9 and below 10 soles of erosion cutting 11, ice-breed rear sight 12, well seals 13 drives 14

The method is carried out as follows.

Collect and accumulate toxic brines in surface accumulators. The preparation of an array of natural collector adjacent to the mine workings is carried out by pumping saturated brines into the vyrabatka

Brines are pumped into natural permafrost reservoirs in areas of the massif with increased fracturing in deep faults through mining workings below the basis of surface erosion.

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to stop the spreading of the brines in the array after they are frozen. Add an additional volume of brines to a mineralization of 30,200 g / l and pump it in g; to (also, hermetic collectors, located above the erosion basis

To prevent the destruction of ice-cold pillars, the injected brines I and avul south until the mineralization is 30,200 g / l, at which their freezing temperature becomes equal to the cryogenically-ertomorphic strata. However, during prolonged storage of liquid waste, the observed climate warming can lead to an increase in cryogenic temperature. ozone-rich mountainous layer, which will dramatically reduce the waterproofing properties of the ice-rock pillar In order to prevent the uncontrolled release of saline water as a result of thawing cryo: on-av- rfnoy strata download their lead in glini- 's collectors

The interaction of filtering solutions (JB with clay rocks that possess 3 moisture deficit creates conditions for local migration of moisture only when the rocks are dehydrated during the freezing of rocks. The brines that cause swelling lose their mobility and become environmentally safe.

Example For the technological tests of the storage of toxic brines into natural permafrost reservoirs in the area of one of the harbors, an experimental landfill was created, located in the subdivision section of carbonate-terrigenous deposits

Megto of the location of the injection site is selected in the zone of manifestation of the tectonically weakened zone of the west-north-west strike. Total fall of rocks of the sedimentary complex is 3-5 ° north-west from the open pit. The altitude absolute mark (+440 m) of the site is 100-120 m above the valleys of the watercourses of the deposit area (+300 m) The permafrost sole is located directly above the Upper Cambrian aquifer

The collection of toxic brines from the drained aquifer 1 is carried out in the bottomhole sump 2 in the lower mining horizon of the open pit. Then, with a semi-stationary pumping station L, they were pumped through pipeline 4 to intermediate sump 5 (ensuring their accumulation, rough cleaning of mechanical particles by settling) and transported by pipeline to the site

storing permafrost in natural reservoirs On the site of storing drainage brines with the surface of the dividing section (a of + 440 m)

passed vertical absorbing wells 6, 7 to the mark above the roof of the first aquifer 8 (a about +150 m), revealing respectively natural reservoirs above (9) and below (10) the bottom of the erosion section 11 (a about 310 m)

Preparation of the near-wellbore array is carried out by pumping small portions of brines into the depleting wells, resulting in leaching

5 ice in the near-wellbore zone, the injectivity of wells increases significantly

First, brines are pumped through the absorbing wells into the reservoirs, which lie below the erosional incision.

0 The injected brines spread out over local voids and eventually froze. The initial mineralization of the injected brines averages 230 g / l. The total volume of brines stored in these collectors exceeds 700 thousand meters. To store toxic brines in natural collectors above the erosion cut at the site underground burial site, 5 wells were drilled with a depth of 60-80 m. The reservoirs were opened at a depth of 20-60 m.

To assess the hermeticity of reservoirs above the erosional incision, the annular space of the absorbing and observational

5 wells 6 were isolated by their mouth equipped with seals 13, providing the ability to measure changes in gas pressure in the reservoirs. To stabilize the pressure, all the wells were sealed and kept sealed until the pressure in the collector was equalized. 13 power 18-ZOM

Clay reservoirs, formed under frosty conditions, are characterized by an average deficit

0 moisture by laboratory tests equal to 27.6%. The results of saturation with marl brines are presented in the table.

Time of full stabilization of pressure 5

5 days After stabilization of the pressure in the reservoir, atmospheric air is injected in an amount that provides an increase in the gas pressure in the underground reservoir to the maximum atmospheric pressure, established according to regime observations (99000 Pa). The temperature of the injected air is maintained close to the temperature of the permafrost above the erosion incision (-Zi - -4 ° C)

As the pressure equipment, the compressor HB 10 (15) is used. the duration of the injection with a flow rate of EJO m / h is 12 days.

After the completion of the air injection, the absorbing well is sealed and the observation of the redistribution of pressure in the reservoir according to the observation of the reservoir is sealed. wells. Full leveling and - in-situ pressure in the reservoir occurred after 7 days. Monitoring of the stability of the overpressure was carried out for 10 days. During JTOT, the period of gas pressure drop in the reservoir was not observed, which indicates the tightness of the test collector. High-precision measurement instruments were used. .MNM-240 (5) –1.0 (15) room dimensions, providing 2 Pa measurement accuracy.

The PTShl evaluation of the underground reservoir tightness during the petrol season is carried out at the surface of the brines with surface water in the quarry with the salinity of g / l in the free capacity of the underground reservoir above the bottom of the zoo incision through the absorbing vertical well 6

When brines are injected, they are absorbed by swelling of marls Only due to swelling about 100 thousand meters of oassoles are stored in them. A total of 260 thousand m3 of drainage water were pumped.

According to laboratory data and the results of field work, a decrease in the salinity of the injected brines was established when interacting with the exchange complex of clay rocks. So, the CI-Na filtered marl pit brines reduced total mineralization by almost a third. At the opening of man-made hydro-talic in the process of injection, the mineralization of filtering brines does not exceed 30-40 g / l, with a decrease in the periphery of hydrogalin talik in the zone of the phase transition of water to ice to 25 g / l.

The decrease in the mineralization of the saline water filtering in the reservoir when interacting with the clay rocks leads to the fact that filtration through 4

the month after the end of the injection, it stopped, their spreading stopped, they froze.

In order to study the filtration process of 5 brines in the permafrost reservoirs, an additional 24 wells were drilled at the test site from 20 to 60 m deep and a complex of electrostatic prospecting was carried out using methods

0 BOT and VES. Based on these data, it was confirmed that the man-made talik formed was completely turned into salty ice.

The route hydrochemical surveys of surface waters in the region did not reveal the presence of injected drainage water, which indicates that the cryogenic-automorphic thickness is waterproof.

0 The application of the proposed method allows to increase the storage of toxic brines, to completely eliminate the costs associated with the construction of drainless storage tanks of saline water.

5 Reducing the volume of construction work also reduces land use, while eliminating more energy-intensive mining can improve working conditions and safety.

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Claims (1)

Invention Formula A method for storing toxic brines in permafrost conditions, 5 including the collection and accumulation of brines in surface accumulators, the preparation of a natural reservoir array adjacent to the mine workings, the injection of brines into natural reservoirs of many frozen permafrost rocks in the massif areas with increased fracturing in the deep faults through the mountain workings below the basis of surface erosion until the spreading of the brines has increased in the array after them 5, characterized in that, in order to increase the storage volume due to more complete use of natural permafrost reservoirs, additional brine pumping is carried out into hermetic clay reservoirs located above the erosion base, and the brines are diluted before injection to mineralization 30 -200 g / l.