RU2347629C1 - Method for utilisation of bore mud - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: peat is added to bore mud in amount of 10-60% from bore mud weight and is mixed to produce uniform mass, artificial turf is formed on assigned site or on road slope. Turf consists of reinforcing base of mesh type, and also mixture of bore mud, peat and mixed grass crop of plant seeds. Turf formation is done by means of alternate application of peat mixture and bore mud together with reinforcing, synthetic, quickly decomposing organic or metal gauze.

EFFECT: efficient utilisation of boring wastes, improved fertility of soil and normalisation of environmental condition.

1 dwg

Description

The invention relates to methods for the disposal of drilling waste and may find application in the oil industry.

Known methods for the disposal of drill cuttings. For example, a method of processing spent drilling mud (RF application No. 2005107571, published on 08.27.2006) on a water basis and formed during drilling cuttings by introducing modified peat, lime and mineral fertilizers, including mixing the spent drilling mud and / or cuttings with modified peat to obtain a granular mass, storage in piles and shelter with a polymer film. Before the mixture is distributed on the land allotment plot, it is re-bumped, averaging the physicochemical parameters of the mixture, the mixture is dispersed on the specified area, and crushed lime and, if necessary, complex mineral fertilizers containing nitrogen, phosphorus and potassium are applied to the surface of the mixture, after which the area is dug up and sown herbs and / or shrubs and trees.

The disadvantages of this method are the complexity of the technological process of processing drill cuttings, when dumping slopes of roads there is a risk of erosion of the applied mixture, as well as inconvenience when moving to the object of dumping and distribution over the site.

A known method of processing waste drilling fluid and / or drill cuttings (RF patent No. 2187531, publ. 08/20/2002) into artificial soil by processing industrial waste into artificial soil with the introduction of peat and phosphorus-containing mineral fertilizers.

The disadvantage of this method is the possibility of using only modified peat of the moss group obtained by freezing, followed by drying in a stream of neutral gases at a temperature of 50-60 ° C.

There is also known a method involving the processing of drill cuttings by mixing with urea foam in an amount of 5-20% by weight of drill cuttings (RF application No. 2005124786, publ. 03/27/2007).

The disadvantage of this method is the unjustified amount of foam introduced, when placed on the slopes of the drill cuttings processed in this way, it is not possible to grow plants due to the lack of the necessary amount of organic compounds, when the mixture is dried, its weathering and migration of toxic components to adjacent territories can occur, moreover during processing, the introduction of hydrocarbon-oxidizing microorganisms that process petroleum products is not provided.

The objective of the invention is the efficient disposal of drill cuttings.

The technical result is achieved by the fact that, based on drill cuttings, a sod is formed that can be used in the reclamation of disturbed lands and landscaping of road slopes.

Disposal of drill cuttings is carried out as follows: peat 10-60% of the mass of drill cuttings is added to the drill cuttings and mixed to a homogeneous mass on a specially designated site or on the slope of the road, an artificial turf is formed, consisting of a reinforcing base such as mesh and a mixture of drill cuttings, peat and mixtures of plant seeds. The formation of turf occurs by alternately applying a mixture of peat with sludge and reinforcing, synthetic (polyethylene, etc.), rapidly decomposing organic (cotton thread, etc.) or metal mesh (see drawing).

When landscaping road slopes, a metal or synthetic mesh is used. Metal and synthetics are not destroyed for a long time and retain their strength, so that the slope is not washed out for a longer time.

In the reclamation of disturbed lands, a rapidly decomposing organic net is used, for example, based on cotton. Such a grid after laying the sod on the reclaimed area quickly decomposes and does not remain in the soil in the form of foreign bodies. In addition, when decomposed, it provides additional nutrients for plants and microorganisms.

Such sod can be used to strengthen the slopes of roads and in the restoration of disturbed lands. The number of mesh layers in the turf depends on the slope angle and varies from 2 to 10. The number of introduced seeds depends on the type of plant. For grass mixtures 10-50 kg / ha of turf.

Sod is transported in rolls or in a stack. The sod is lined up on the site, and since it is a fertile base, vegetation forms on it. If the sod is lined on the slope of the road, the root system of plants and the reinforcing mesh prevent the erosion of the slope and greening it. Drill cuttings in combination with peat provide a good nutrient substrate for plants, so they quickly develop and form a dense sod. Sod is also used in the reclamation of disturbed areas, including oil-contaminated ones. The composition of peat used in the production of turf includes various oil-destroying microorganisms, due to which the restoration of the oil-contaminated area occurs more quickly. The sod is lined up on an oil-contaminated area, plants germinate, the root system penetrates into pollution and thereby improves the exchange of water and oxygen, which helps to accelerate the decomposition of oil products and allows microorganisms to multiply and decompose oil products more intensively.

For the reclamation of 1 ha of oil-contaminated area, 1 ha of turf with a capacity of 15 to 50 cm is required.

An experiment was conducted in the summer on a site contaminated with oil as a result of a pipeline accident. The site was located on the territory of the Petelinsky field. The control of this technical solution was carried out based on the results of chemical analyzes of soil samples from the place of reclamation and the state of the projective cover of the vegetation cover.

The site reclaimed according to the technology of this invention, the area of oil pollution of 2.3 hectares. A comparative analysis takes 4 years from the time of the accident in the summer. After 20 days after the accident, complete suppression of the vegetation cover was observed at the site, indicating the content of petroleum products many times higher than the MPC (400 mg / kg). The results of a chemical analysis for the presence of petroleum products in the soil showed a concentration of 5682 mg / kg.

After 4 years, in the area subjected to reclamation according to the technology of the present invention (in this case, the turf thickness was 30 cm, peat was introduced in an amount of 50% of the volume of drill cuttings, the amount of introduced seeds was 40 kg per 1 ha of turf), restoration of the vegetation cover was observed - 100 % of the total area of pollution. The results of a chemical analysis for the presence of petroleum products in the soil showed a concentration of 731 mg / kg.

Thus, the use of the invention allows to efficiently dispose of drill cuttings, to restore disturbed areas of land, increase their fertility and thereby normalize the environmental situation.

Claims (1)

A method of utilizing drill cuttings, including mixing drill cuttings and peat in an amount of 10-60% by weight of drill cuttings, forming an artificial turf on a specially designated site or on a slope of the highway, consisting of a reinforcing, multilayer base like mesh, as well as a mixture of drill cuttings, peat and mixtures of plant seeds.