RU2333360C1 - Method of recultivation of sludge pit under conditions of eternal frost - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to ecology, particularly to techniques of rehabilitation of disturbed lands during performance of drilling operations in the process of well construction under the conditions of eternal frost. The recultivation method includes purification of the liquid phase, mixing drilling wastes with peat. The liquid phase is frozen up, the pieces of ice are placed on the bottom of the sludge pit and covered with a layer of the mix of drilling wastes with peat.

EFFECT: mitigation of negative impact on the environment and reduction of material expenses for recultivation of sludge pits.

1 tbl, 3 dwg

Description

The method relates to the technology of restoration of disturbed lands during drilling operations during the construction of wells under permafrost conditions.

There is a method of reclamation of an earthen barn, including pumping out liquid drilling waste, eliminating coagulation clots of spent drilling mud, filling the barn with mineral soil, planning the territory (Patent RU 2002101270 A).

There is a method of reclamation of a storage barn (Patent RU 2003118006 A), including filling or hydronuding mineral soil, building a barn, waterproofing, filling with spent drilling fluid, pumping out the liquid phase, eliminating the fluidity of coagulation clots.

The disadvantages of these methods are that they are very expensive, since a large amount of mineral soil is required to fill the barn; machinery and equipment for hydraulic washing and transporting this soil, which affects the environmental situation, disrupting the condition of the rivers in which the sand is being washed.

The closest analogue is the method, including preliminary localization of the liquid phase in the volume of the barn, its cleaning, mixing of mineral soil, peat and treated drilling fluid and moving to the slopes of the spray bed and adjacent roads, sowing grass on the slopes and watering it with the purified liquid phase (Patent RU 2273736 C1, E21B 21/06).

The disadvantage of this method is the need to use a large amount of mineral soil, equipment for transporting the resulting solution to the slopes of the bulk dump and adjacent roads, which pollutes the atmosphere and worsens the condition of the road soil.

The aim of the claimed invention is to reduce the negative impact on the ecological situation of the environment and reduce material costs during the restoration of sludge pits.

The goals are achieved:

1) the replacement of mineral soil with a liquid phase crystallized as a result of subzero temperatures, which reduces both material costs and the negative impact on the condition of the rivers used for hydraulic sand washing;

2) reducing the need for technological transport, which reduces the amount of harmful emissions into the atmosphere, the negative impact on the existing road surface and reduces material costs;

3) due to the lack of the need for water utilization in this method by reducing material costs for equipment for these purposes.

The proposed method is implemented as follows.

Preparatory work is carried out at positive temperatures. The slurry barn is separated by a sand dump (2) for pumping settled water (1, 3) into one of the sections. In the section from which the water was pumped out, the drilling waste with peat is mixed with an excavator. In another section, water is purified (4) or coagulated using known chemicals.

As the temperature decreases, the settled liquid phase freezes. And with the help of an excavator, ice (7) is split into pieces. In the section with mixed drilling waste and peat, a pit (5) is torn out, part of the ice pieces (6) are transferred to its bottom - up to 1 meter high and filled with the existing mixture of drilling waste and peat.

In another section, work is carried out according to the following scheme: they split the remaining ice, transfer it to the surface of the sludge pit, mix the drilling waste with peat, break a hole and lay pieces of ice on the bottom (Fig. 1-3).

A reclaimed barn is obtained, at the bottom of which there is an ice layer covered with a mixture of drilling waste and peat. After the work is completed, the barn is covered with mineral soil and the vegetation is sown.

This method was experimentally tested at the Pravdinskoye field at cluster site No. 111. The results of observation of ice melting showed that when the layer is formed in proportion one meter of ice and two meters of a mixture of drilling waste and peat, the ice does not thaw for 3 years (see table).

Table
Ice Melting Observation Results Experience number peat, % the thickness of the mixture of drill cuttings and peat, m ice thickness m melting in 3 years,% one 5 1,2 one twenty 2 5 2 one 0

Claims (1)

A method of reclamation of a slurry barn under permafrost conditions, including cleaning the liquid phase, mixing the spent drilling waste with peat, characterized in that the liquid phase is frozen, pieces of ice are placed on the bottom of the slurry barn and covered with a layer of a mixture of drilling waste and peat.

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