RU2631681C1 - Method for disposing drilling mud when producing man-made soil - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method for disposal of drill mud when producing man-made soil includes mixing of drill mud and sand. Phosphogypsum is introduced in the drill mud in the amount of 3-5% of the drill mud weight, mineral sorbent (glauconite) in the amount of 5-10% of the volume fraction of drill mud, sand - 25% of the volume fraction of drill mud, with further components mixing to produce man-made soil and sowing of crops-phyto-meliorants in combination with humic "Rostock" - 200-400 l/ha.

EFFECT: effective and economically feasible technology for disposal of drill mud.

1 tbl, 1 ex

Description

The invention relates to methods for disposing of drill cuttings and reclamation of disturbed lands occupied by sludge pits / temporary sectional drives based on the use of industrial waste (phosphogypsum) in combination with agrobiological techniques.

A known method of disposal of drill cuttings, which consists in the fact that peat, lime and mineral fertilizers are introduced into the drill cuttings / RU 2005107571, E21B 43/22, publ. 08/27/2006 /. Everything is mixed until a loose mass is obtained, which is stored in collars and covered with a polymer film. Before distributing the mixture on the land allotment, it is processed by averaging its physicochemical characteristics of the mixture, the mixture is dispersed on the site and ground lime is added to the surface and, if necessary, complex mineral fertilizers containing nitrogen, phosphorus, potassium, after which the site is dug and sown herbs or plant trees.

The disadvantages of this method are the complexity of the technological process for the disposal of drill cuttings, when dumping the slopes of the road there is a risk of erosion of the applied mixture, as well as inconvenience when moving it to the dumping object and when distributing to the site.

A known method of disposal of drilling fluid and drill cuttings in artificial soil by processing drilling waste using modified peat and phosphorus-containing mineral fertilizers / RU 2187531, C09K 7/02, publ. 08/20/2002 /.

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

There is a method of restoring land occupied by sludge pits formed as a result of oil production, in which a thickening agent, bentonite clay, is added to the drilling waste (drill cuttings) and stirred throughout the volume to a homogeneous state of the contents of the sludge pit. After completion of the process of thickening drilling waste (drill cuttings) with stirring, a peat-sand mixture is poured into the barn until the barn area is aligned with the adjacent terrain / RU 2479364, B09C 1/08, publ. 04/20/2013 /.

The disadvantage of this method is the use of a large amount of bentonite clay, when dumping the slopes of the road there is a risk of erosion of the applied mixture.

A known method of disposal of drilling waste, which includes mixing drill cuttings, quicklime, peat, cement and sand. Additionally, drilling mud is mixed with technical carbon, followed by mixing with quicklime, followed by sequential mixing with peat, cement and sand. Then the resulting mixture is kept for 2 or 3 days / RU 2508170, B09B 3/00, publ. 02/27/2014 /.

The disadvantage of this method is the invariance of the chemical and physico-chemical properties of drill cuttings; as a result of this technology, the resulting mixture is “sealed”; utilization of the solid phase of drill cuttings is carried out by treatment with binders (cement) in order to bind fine particles of cuttings in a dense mass of soil of a lumpy structure, in case of violation of the technology of using cement, the resulting mixture cannot be recycled.

A known method of utilization of drill cuttings, including mixing drill cuttings with pre-foamed and cured urea and / or formaldehyde resin, the additional introduction of calcium-containing and organic additives, followed by mixing with cement and oxides / RU 2323293, E01C 3/04, publ. April 27, 2008 /.

The disadvantage of this method is the presence in the prepared mixture of a component in the form of a urea and / or formaldehyde resin having a hazard class 4 and having high toxicity and environmental hazard due to the release of phenolic compounds into the environment.

A known method of utilization of drill cuttings, including mixing drill cuttings with sand, peat, a sorbent (Miksoil or MIU-S) and a hydrocarbon biodestructor (Soyleks or Centrin) / RU 2522317, B09C 1/10, publ. 07/10/2014 /.

The disadvantage of this method is the need for removal and disposal of the sorbent (Miksoil or MIU-S); drill cuttings disposal technology does not reduce to hazard class V; when filling the slopes of the road there is a risk of erosion of the applied mixture.

A known method of processing drill cuttings comprising mixing drill cuttings with sand, adding hydrochloric acid, providing a pH of the mixture from 5 to 8, followed by mixing of the components and drying. As a result, inert building material or man-made soil / RU 2524708, E21B 21/06, publ. 08/10/2014 /.

The disadvantage of this method is the use as an acidifying reagent - hydrochloric acid; lack of demand as the obtained inert building material or man-made soil.

There is also a method of disposing of drill cuttings to obtain the building material "Burolit", including drill cuttings mixed with cement, urea-formaldehyde foam, additionally mineral filler (sand and crushed granite) / RU 2303011, C04B 28/04, publ. July 20, 2007 /.

The disadvantages of this method are the high cost, low frost resistance and strength, especially in areas of flooding, large volumes of product formation, lack of demand on the market.

There is also known a method of disposing of drill cuttings to obtain building material, including drill cuttings, sorbent - penoizol, and / or non-sorbolite and / or sorbolite, and / or ashes and slag mixtures, mineral filler - heat-treated proppant and / or sand, and / or natural unbound soils, and as a hardener use heat-treated drill cuttings, and / or cement, and / or a calcium-containing additive, and / or sodium glass and / or gypsum, the shaper includes a mixture of urea resin and soda ash, to In addition, the mixture contains a desiccant in the form of peat; quicklime is also used as a calcium-containing additive / RU 2490224, C04B 18/00, publ. 08/20/2013 /.

The disadvantage of this method is the large volume of product formation, lack of demand on the market.

A known prototype of the disposal of drill cuttings to obtain a mixture of soil slurry and soil for the restoration of quarries and disturbed lands by introducing into the peat-sand mixture, drill cuttings ameliorating additives, which use gypsum or phosphogypsum in an amount of 2-3% of the volume / RU 2491135, IPC B09B 1/100, publ. 2013 /.

The disadvantages of this method are the use of a large amount of peat (23-32.5%), natural sand (16-25%), which involves additional development of peat and sand and leads to an increase in anthropogenic pressure on the environment; use as a recultivated layer with a high content of peat sand mixture (50-69%), which is associated with an increase in energy costs.

The main objective of the invention is an effective and economically feasible technology for the disposal of drill cuttings, which is expressed in the following technical solution: improving the water-physical, physico-chemical and chemical properties of drill cuttings by introducing industrial waste (phosphogypsum), reducing the concentration of oil hydrocarbons by adding mineral sorbent (glaucanite), as well as the additional use of sand and humic preparation "Rostock" to create favorable conditions for fit crops liorantam.

The specified technical result is achieved by the fact that phosphogypsum in the amount of 3-5% of the mass of drill cuttings, mineral sorbent (glaucanite) in the amount of 5-10% of the volume fraction of drill cuttings, sand is introduced into the drill cuttings per 1 ton per 25 ton of sand volume fraction of drill cuttings, with further mixing of the components to obtain technogenic soil and sowing phytomeliorant crops in combination with the Rostock humic preparation - 200-400 l / ha.

The method of disposal of drill cuttings is based on the introduction of phosphogypsum as an ameliorant, in which there is a failed filtering. Sodium cations, which impart a sol state to the drill cuttings, are replaced by calcium cations, which contribute to the formation of a water-resistant structure with good filtration ability, thereby the pH of the drill cuttings changes from alkaline (pH = 8-11) to neutral (pH = 7). Laboratory studies on the introduction of a mineral sorbent (glauconite) into drill cuttings indicated that the degree of decomposition of oil hydrocarbons in experiments with its use (temperature T = 20 ° C, holding for 45 days) is 85-90%. According to the results of biotesting, the obtained soil for the formation of a soil-like medium belongs to the V hazard class. The use of the humic preparation "Rostock" favorably affects the development of plants, while the formation of a viable phytocenosis with high values of the phytomass of vegetative overhead shoots 897.4-1162.8 g / m ² (wet weight).

The obtained technogenic soil is used for filling sludge pits, during flattening of the territory with a layer of up to 30 cm, reclamation of pits, ditches and other erosion forms on the territory of the cluster site outside the areas of temporary use, followed by sowing seeds in the reclaimed layer.

Disposal of drill cuttings is as follows.

Phosphogypsum, mineral sorbent (glauconite) and sand are added to the drill cuttings, followed by mechanical mixing of the components until a homogeneous mass is obtained (see table).

Processing the soil with a humic preparation “Rostock” to form a soil-like environment enhances the stress tolerance of phytomeliorant crops, stimulates the growth and development of plants, limits the flow of toxicants into the plant, which allows sowing of perennial grasses in northern regions.

Example 1

Liquid sludge (oil emulsion), bituminized oil (crust), large foreign objects are removed from a sludge barn / temporary storage tank that contains drilling hazard grade III-IV drill sludge located within the territories of facilities for arrangement of cluster sites, territories of temporary land allotment pumping out the aqueous phase, creating cutting strips.

After that, phosphogypsum in the amount of 3-5% of the mass fraction of drill cuttings, mineral sorbent (glauconite) - 5-10% of the volume fraction of drill cuttings, sand is added to each section of the slurry barn / temporary storage, separated by cutting strips, sand - 25% of volume fraction of drill cuttings.

After carrying out the work in the barn / temporary storage, a reclamation layer of at least 30 cm is formed, followed by the sowing of phytomeliorant crops in combination with the Rostock humic preparation - 200-400 l / ha.

Claims (1)

A method of utilizing drill cuttings in the production of industrial soil, including mixing drill cuttings and sand, characterized in that additionally industrial waste (phosphogypsum) is introduced into the drill cuttings in the amount of 3-5% by weight of drill cuttings, glauconite sorbent in the amount of 5-10% from the volume fraction of drill cuttings, sand - 25% of the volume fraction of drill cuttings, followed by altering the components to obtain technogenic soil and sowing phytomeliorant crops in combination with the Rostock humic preparation - 200-400 l / ha.