RU2273736C1 - Earth sump reclamation method - Google Patents

Abstract

FIELD: earth recovery during drilling work performing.

SUBSTANCE: method involves waterproofing sump walls and bottom; filling thereof with used drilling mud; pumping-out liquid phase and filling thereof with peat and mineral ground. Liquid phase is previously accumulated in the sump and cleaned. Mineral ground, peat and used drilling mud are mixed one with another and supplied to bank slope or to road slope. Then grass is planted on slopes. Cleaned liquid phase is used for grass watering.

EFFECT: increased quality of earth sump reclamation.

1 dwg

Description

The invention relates to the technology of restoration of disturbed lands in the field of ecology during drilling operations in the construction of deposits.

The reclamation method of earthen barns is intended to create artificial landscapes after completion of well construction.

The aim of the invention is to improve the quality of reclamation of earthen barns. This is achieved by the fact that the liquid phase is preliminarily localized in the volume of the barn and cleaned, the mineral soil, peat and spent drilling mud are mixed and moved to the slopes of the spray bed and adjacent roads, grass is sown on the slopes, which is watered with the purified liquid phase. The proposed method allows to diversify the formed natural landscape, to reduce the risk of spent drilling fluid.

There is a known method of eliminating earthen barns, including isolation of the bottom and walls of the barn, filling the barn with spent drilling fluid (OBR), pumping out the liquid phase of the OBR, filling the barn with mineral soil and catching coagulation clots in the pit, which is then also filled with mineral soil (see Fedoriv L. V. et al. Reclamation of earthen barns in the Middle Ob region. "Oil industry, No. 6, M. 1986, p.5-6).

This method has a significant drawback, since it is associated with a sharp increase in the volume of earthwork, which leads to a rise in the cost of well construction.

The closest analogue is the method of reclamation of earthen barns, including waterproofing the walls and bottom, filling with spent drilling fluid, pumping out the liquid phase, eliminating the fluidity of coagulation clots of spent drilling mud with peat and backfilling with mineral soil.

However, the known method has the disadvantage of the following. As a result of backfilling with peat and mineral soil, dangerous OBR are deprived of air access, which interrupts the biological decomposition of hydrocarbons, which are the main pollutant that determines the risk of drilling waste. As a result, the biological stage of reclamation becomes impossible. In addition, there is a risk of pollutants being carried outside the cluster pad by surface and underground waterways. Another disadvantage is that the liquid phase pumped out from the barns is also a pollutant of the natural environment, cannot be used for technical purposes and requires additional disposal.

The aim of this invention is to improve the quality of technical reclamation of earthen barns by preventing possible future environmental pollution and activating the subsequent biological decomposition of pollutants.

This goal is achieved by the fact that the liquid phase is preliminarily localized in the volume of the barn and cleaned, the mineral soil, peat and spent drilling mud are mixed and moved to the slopes of the spray bed and adjacent roads, grass is sown on the slopes, which is watered with the purified liquid phase. The proposed method is implemented in the following sequence.

During the construction of cluster sites, mineral soil is poured, in the volume of which an earthen barn is arranged, which has a capacity sufficient to accommodate the spent drilling mud, which is formed during the drilling of oil and gas wells. After completion of the bush construction, the barn is being reclaimed. Initially, the OBR liquid phase is pumped to a designated location in the barn, which is localized by waterproofing, for example, with a film or sanding a mixture of sand and clay. Then, water of the liquid phase OBR is purified by known methods, for example, coagulation sedimentation or filtration. In the remainder of the barn, sand and peat are brought in, which are mixed with the solid phase OBR. Mixing can be done by excavators or bulldozers. The resulting mixture is moved from the barn to the slopes, leveled and planted with grass, water from the purified liquid phase of the OBR is used to water the grass. The capacity of the earthen barn freed from the spent drilling fluid and the OBR liquid phase over time is filled with rain and melt water and turns into a landscape element that can diversify the natural ecosystem.

The implementation of this method is illustrated in the drawing, which schematically depicts a cluster site of an oil field.

The numbers indicate:

1 - a mixture of drilling waste, peat and mineral soil;

2 - slope of the dump bed;

3 - filling of the cluster pad;

4 - waterproofing;

5 - liquid phase of compartment B;

6 - a partition of sand and clay;

7 - the liquid phase of compartment B;

8 - solid phase compartment B;

9 - solid phase compartment B.

Letters denote:

A - earthen barn with drilling waste;

B - part of the earthen barn, where the solid phase of drilling waste is mixed with peat and mineral soil;

B is the part of the barn where the liquid phase is cleaned by settling.

During the construction of cluster sites, filling with 3 mineral soil is carried out, in the volume of which an earthen barn A is arranged, the walls of which are waterproofed with a plastic film 4. After completion of the cluster construction, the barn filled with spent drilling mud (OBR) is reclaimed. Initially, in the volume of the earthen barn, a partition 6 is made of a mixture of sand and clay, which has waterproofing properties. This partition 6 divides the earthen barn A into two compartments: compartment B and compartment B. Then, from the compartment C, the liquid phase OBR 7 is pumped to compartment B using the pump, and the solid phase OBR 8 from compartment C is moved by the excavator to compartment B. After settling and the separation of the liquid phase OBR 5 and the solid phase OBR 9 in compartment B, the entire liquid phase OBR is pumped into axle C using a pump. Thus, only solid OBR phase remains in compartment B, and only liquid OBR phases in compartment B. The liquid phase in compartment B is cleaned, for example, using a coagulant - aluminum sulfate. Sand and peat are brought into compartment B, which are mixed with OBR. Mixing can be done by excavators or bulldozers. The resulting mixture 1 is moved from compartment B to the slopes of cluster bed 2, leveled and sowed with grass, water from the purified liquid phase OBR from compartment B is used to irrigate the grass. The capacity of the earthen barn A freed from drilling waste and liquid phase is filled over time with rain and snow melt water and turns into an element of the landscape, which is able to diversify the natural ecosystem.

This method has been experimentally tested in Western Siberia, in a swampy area at the bush sites of Priobskoye field. As the analyzes showed, the content of petroleum products is reduced by 10-17 times, the hazard class of waste changes from III to V, and the germination of grass seeds on the slopes occurs within 10-15 days, the resulting artificial landscapes meet aesthetic and environmental requirements.

Claims (1)

The method of reclamation of earthen barns of spraying dams, including waterproofing the walls and bottom, filling with spent drilling fluid, pumping out the liquid phase and backfilling with peat and mineral soil, characterized in that the liquid phase is pre-localized in the volume of the barn and cleaned, mineral soil, peat and spent drilling mud mix and move to the slopes of the spraying bed and adjacent roads, grass is sown on the slopes, which is watered with a purified liquid phase.