Scholarly article on topic 'Creation of Favourable Water – Physical Properties of Drill Cuttings with the use of Coagulants'

Creation of Favourable Water – Physical Properties of Drill Cuttings with the use of Coagulants Academic research paper on "Materials engineering"

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Procedia Engineering
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Keywords
{"drill cuttings or drilling sludge" / coagulants / "exchangeable sodium" / "caustic and soda ash"}

Abstract of research paper on Materials engineering, author of scientific article — L.N. Skipin, V.S. Petuhova, E.A. Romanenko

Abstract The negative physical properties of drilling cuttings are caused generally by the presence of large amounts of exchangeable sodium. Its sources are boring solutions with the use of caustic and soda ash and also the saline rocks extracted in the process of drilling. Drilling cuttings have lack of structure and swelling in the wet state, adhesiveness, low water mobility, reduced air exchange, a high hydrophylicity, lack of filtration capacity. In addition to these physical properties drilling cuttings are characterized by a number of the negative chemical properties, in particular, a high alkalinity and the presence of easily soluble toxic salts of sodium, the lack of exchangeable calcium and magnesium. The following properties make absolutely impossible the use of drilling cuttings in road construction, and also taking into acoount their restoration. Application of a number of natural coagulants such as (gypsum, diatomite, quicklime, etc.) And the waste of the industrial activity (a phosphogypsum, carnallite, sludge formed during the purification of the surface and underground water) radically improves physical properties of drilling sludge and provides multiple increase in filtration capacity.

Academic research paper on topic "Creation of Favourable Water – Physical Properties of Drill Cuttings with the use of Coagulants"

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Procedía Engineering 189 (2017) 593 - 597

Procedía Engineering

www.elsevier.com/locate/procedia

Transportation Geotechnics and Geoecology, TGG 2017, 17-19 May 2017, Saint Petersburg,

Russia

CREATION OF FAVOURABLE WATER - PHYSICAL PROPERTIES OF DRILL CUTTINGS WITH THE USE OF COAGULANTS

L.N.Skipin*, V.S. Petuhovaa*, E.A. Romanenkoa a' 625025, Tyumen, Volodarsky 38, Russia, sav.vs8S@rambler.ru

Abstract

The negative physical properties of drilling cuttings are caused generally by the presence of large amounts of exchangeable sodium. Its sources are boring solutions with the use of caustic and soda ash and also the saline rocks extracted in the process of drilling. Drilling cuttings have lack of structure and swelling in the wet state, adhesiveness, low water mobility, reduced air exchange, a high hydrophylicity, lack of filtration capacity. In addition to these physical properties drilling cuttings are characterized by a number of the negative chemical properties, in particular, a high alkalinity and the presence of easily soluble toxic salts of sodium, the lack of exchangeable calcium and magnesium. The following properties make absolutely impossible the use of drilling cuttings in road construction, and also taking into acoount their restoration. Application of a number of natural coagulants such as (gypsum, diatomite, quicklime, etc.) And the waste of the industrial activity (a phosphogypsum, carnallite, sludge formed during the purification of the surface and underground water) radically improves physical properties of drilling sludge and provides multiple increase in filtration capacity.

© 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Peer-review under responsibility of the scientific committee of the International conference on Transportation Geotechnics and Geoecology

Keywords: drill cuttings or drilling sludge, coagulants, exchangeable sodium, caustic and soda ash.

Abstract

Annual economic damage from the pollution of the environment with production and consumption waste is evaluated at the level of 10% gross domestic product. The most rational direction of utilization of the industrial waste is to use them as technology-related raw material while generating different types of production and, mainly,

* Corresponding author. E-mail address: sav.vs83@rambler.ru

1877-7058 © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Peer-review under responsibility of the scientific committee of the International conference on Transportation Geotechnics and Geoecology doi: 10.1016/j.proeng.2017.05.094

for building purpose [2].

During the p roc ess of borehole drilling and deepening large amount of cuttings appears on the bottomhole. During the hydraulic transportation via flush water, the cutting turns into drill cutting under the influence of technology-re la ted factors [3]. Bore mud can be conditionally divided into sump liquid and drill cuttings. Storing of drilled out wastes at the multiple well platforms is carried out in the mud pits [4].

Bore mud is the most important large-tonnage waste of oil industry. It is a sort of industrial wastes with a series of distinctions. This distinction is rocks which are ground during the drilling and carried away to the daylight using drilling agent. Depending on the toxicity of the components of the drilled solids and applied reagents toxicity of bore mud changes [3].

Bore mud has negative hydrophysical and chemical properties, in particular, low filterability, lack of structure, moisture susceptibility, adhesiveness, swelling ability, alkalinity, salt content and solonetzicity.

Research objective: to create favorable physical properties of bore mud using them as coagulants of industrial production waste and natural materials.

Research tasks: to study filterability of bore mud under the influence of phosphogypsum of different dosage, solid sediment of purification of surface and underground waters, natural mineral diatomite,

Filterability of the bore mud with the use of different samples of coagulants was determined in laboratory conditions in three-fold replication by the method of pipes [1].

Diatomite used in the test is from Kamyshlovkoc deposit of Sverdlovkaya region. It is product of ancient geological deposits presented by the diatoms. It contains prevalent amount of compounds of silica and calcium.

Coagulant dose - diatomite, g Fig. I. Influence of dialomitc on filterability of bore mud.

Correlation ratio between the samples of diatomite and filtration was 0.83 that testifies to the strong bond. Determination parameter shows that diatomite addition provides 69% improvement of filterability of the bore mud (figure 1 ). It's necessary to add that appearance of filtration activity took place during the last two weeks, this indicates insufficiaent content of acting substance used as a coagulant. Very high reserves of diatomite in the North of Tumen region don't exclude possibility of their use as a améliorant-coagulant.

nj ■o

ij" 01

is o.s

s; o.6 0)

s; 0.4

—i —•—i r ■ 1— v = 0.653

0,0 0.2 0,4 0.6 0,8 1,0 1.2 1,4 1,6 1.8 2.0 Coagulant dose - sediment Metelevsky water intake, g

Fig. 2. Influence of Metelevskiy water-intake on the fllterability of bore mud.

£ 0.5 x>

£ 0.2

iB 0.1

.0 0,2 0 4 0 6 0,8 1 0 1 2 1 4 1 6 1 8 2.

1 = 0.123 lx2 - 0,092x + 0.0017

Coagulant dose - sediment Velizhansky water intake, g

Fig. 3. Influence of Velijanskiy water-intake on the fllterability of bore mud.

Solids of Velijanskiy and Metelcvskiy water-intakes, providing Tumen with clean water, insignificantly improve fllterability of the bore mud (figure 2, 3). This is explained by the prevalence of inactive from of chemical composition of the compounds of iron and aluminum in the necessary amount. Correlation ratio testifies to the strong bond (r=0,76) between coagulant dose {Meteievskiy water-intake) and water permeability and for the sediment of Velijanskiy water-intake, correlation ratio was (r-0,62). Solids as wastes of purification of surface and artesian waters can't be used as coagulants for the bore mud. Their efficiency was significantly lower than natural diatomite.

8 600 3

t> 50.0 ai

£ ¡tT40.0 ¡= ^

g Ë30.0

S 20.0

| 10.0 a

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1,6 1.8 2.0 Coagulant dose - phosphosgypsum, g

Fig, 4. Influence of phosphogypsum on filterabiliEy of the bore mud.

While adding such coagulant as phosphogypsum, displacement of exchangeable sodium with calcium takes place. As a result of carry-over of salts, pH of the bore mud changes to the neutral. Thanks to this optima! physical, chemical and biological properties of the bore mud are created. Out of all considered coagulant-améliorants, using of phosphogypsum - waste of chemical industry is the most perspective. This is stipulated by the availability and its low cost. Correlation ratio between samples of phosphogypsum and size of filtration was 0.64. This is stipulated by the fact that in case of full displacement of exchangeable sodium doesn't lead to increase of filtration. However, nitration parameter during the use of phosphogypsum was 10 times larger than that ofdiatomite (fig. 4). Use of phosphogypsum as a coagulant for chemical amelioration of the bore mud allows reducing of storage area at the enterprises ofUral and removing negative influence of the bore mud as well as phosphogypsum on the environment.

Thus, use of phosphogypsum radically improves physical properties of the bore mud. Solids of the water purification from the water-intakes of Tumen don't provide necessary améliorant cffect. Use ofdiatomite tor the improvement of fïllcrability is less effective than that of phosphogypsum but it's possible in North conditions of Tumen region since its stock there is estimated by billions of tons. Meliorated bore mud can be utilized as building material for the filling of roads in terms of oil and gas-ex tract ion. Without use of coagulants, there is no filtcrability of mud.

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