SU1375637A1 - Solidifying composition for detoxication of waste clayey drilling muds and sediments of drilling effluents - Google Patents

Abstract

The invention relates to the oil and gas industry and is intended for the construction of wells. The purpose of the invention is to reduce the contaminating ability of waste drilling muds and sediment of drilling waste water due to the increased degree of contamination of contaminants. The composition contains the following components with a ratio, wt., H .: portland cement 100; filtroperlit 50-100. The composition is used to consolidate all waste clay drilling muds based on water with a solids content of 16% and above. The composition is prepared by mixing Portland cement and filtroperlite, and the mixture is added to the spent drilling mud. The introduction of portland cement and filtroperlita ensures the binding of contaminants into the structure of the solidified mass. Under the influence of the aquatic environment, the consolidated mass is not destroyed and allows you to completely neutralize pollutants. 2 tab. S (L with cd 05 with

Description

The invention relates to consolidating compositions for the disposal of drilling wastewater sludge and waste water-based drilling fluids by treating them with a consolidating composition and can be used in the oil and gas industry in the construction of wells.

The aim of the invention is to reduce the contaminating ability of waste drilling muds and sediment of drilling wastewater by increasing the degree of binding of contaminants.

The goal is achieved by using a consolidating composition that includes Portland cement and filtroperlite at the following content, wt.

Drilling wastewater (BSV), spent drilling mud (OBR), formed during the construction of wells, significantly pollute the environment. The precipitates identified during the purification process for BSB are of a colloidal suspension type.

OBR and precipitates of BSV contain, in dissolved, colloidal and suspended state, contaminating components, the main of which are organic compounds represented by chemical reagents of different nature, quantified by bichromate oxidation or chemical oxygen consumption (COD), as well as oil and petroleum products. In terms of composition and contaminating properties, the precipitation of BSV is close to OBR. The dumping and storage of such waste in land barns can lead to pollution of the soil, surface and subsurface waters, and the cause of ecological imbalance in nature.

The composition is applicable to the consolidation of all waste water-based mud drilling muds encountered in drilling practice, with a solids content of 16% and above.

The specific surface area () is developed, the presence of uncompensated charges and exchange ions in it cause a high adsorption capacity of the filter-perlite. Due to its composition, filtroperlite is able to enter into chemical interaction with an imitative; it has a large water retaining

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ness (6-7 kg / kg). Participating with OBR and Portland cement in hydration reactions, filter-perperlite gives insoluble in-water hydrate growths. The introduction of portland cement and filtroperlita ensures the binding of contaminants into the structure of the solidified mass. When exposed to the aquatic environment, the consolidated mass is not destroyed.

Example 1. Mix 3.5 g of Portland cement and 3.5 g of filtroperlita. The resulting mixture is added to 100 g of spent drilling mud, consisting of 63.0 wt.% Solids, 35.0% water and 2.0% oil, characterized by a COD equal to 59.328 kg / m, and mixed until a homogeneous masses. The mass cured for 14 days has a strength of 6.3 kg / cm. And the contaminating effect of OBR almost completely excludes -, - p. The cured samples are then kept under water conditions. The COD of the extraction water after 14 days of being in the water of the samples has an index of 0.362 kg / m.

Example 2. Mix 14 g of Portland cement and 7 g of filtroperlita. The resulting mixture is added to 100 g of spent drilling mud, consisting of 16.05 wt.% Solids, 82.72% water and 1.23% oil, characterized by a COD equal to 4.846 kg / m - and mixed until homogeneous mass. The weight hardened during 14 days has a strength of 12 kg / cm. Then, the hardened samples are kept in the water conditions of the COD of the extraction water after 14 days of being in the water of the samples. The indicator is 0.125 kg / m.

Example 3. A mixture of portland cement and filtroperlite is prepared as follows. Mix 7.5 g of portland cement and 7.5 g of perperitol. The resulting mixture is added to 100 g of spent drilling mud, consisting of 63.0% by weight solids; 35.0% water, 2.0% oil, and characterized by a COD of 59.328 kg / m, and stirred until a homogeneous mass is obtained. The mass cured for 14 days has a strength of 11.4 kg / cm. Then the cured samples are kept in water. conditions COD extraction water

after 14 days, the samples are in water at 0.281 kg / m.

Example 4. 7.5 g of Portland cement and 7.5 g of filter perperlite are mixed. The resulting mixture is added to a 100 g precipitate BSV consisting of 11 wt.% Solids and 89% water and characterized by a COD of 3.100 kg / m and stirred until complete dissolution of the added mixture. The mass cured for 14 days has a strength of 4.1 kg / cm. The hardened samples are then exposed to water. The COD of the extraction water after 14 days in the water of the samples is 0.026 kg / m

In tab. 1 presents data on the consolidation of OBR and draft BSV; in tab. 2 — COD value of the extractant, with a hardening time of 14 days, and a time for sample retention under aqueous conditions for 14 days.

For the experiment, two types of solutions and a BSV sediment are used: spent drilling mud with a high content of solids (OBR), with the following indicators: the amount of solids 63.0%; water 35.0%, oil 2.0%, COD 59.328 kg / m, pH 8.9, and spent drilling fluid with a low solids content (OBPj) with the following indicators: solid phase amount 16%, water 82, 72%, oil 1.28%, COD 4.846 kg / m, pH 7.0. The characteristics of the precipitate BSV, obtained during the purification BSV aluminum sulphate, contains: solid phase 11; water 89; COD 3.100 kg / m, pH 7.0.

OBR, - the solid phase contains 95.74% barite (, 2 g / cm) and 4.26%

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clay with drilled rock. OBR - solid phase contains 63.83% barite. (, 2 g / cm) and 36.17% clay with drill cuttings. The precipitate BSV - solid phase contains 10% clay and 1% aluminum hydroxide.

Based on the results presented in table. 1, it can be concluded that the cured mass has high strength characteristics for all the compositions used and. allows you to qualitatively consolidate OBR with both small and high solids content, as well as precipitation of BSV, completely excluding environmental pollution. Analysis of the water extract (tab. 2) shows that the consolidating composition for the treatment of OBR and sediment BSV allows you to completely neutralize their contaminating ability.

Claims (1)

Invention Formula A consolidating composition for the disposal of waste {mud drilling mud and drilling waste sludge, including Portland cement and an additive, characterized in that, in order to reduce the contaminating ability of the spent drilling mud and drilling mud sludge due to the degree of contamination of the pollutants It contains filtroperlite as an additive when the next hundred components are held, mac.h: Portland Cement 100 Filterperlit50-100 Waste boring Compressive strength, kg / cm, when the amount of the consolidant in the mass OBR, May. % when the content of portland cement / filter - with perlite 100/100 holding portland cement / perlite filtering 200/100 7 I 15Y 2020 , 37,511,420,622,8 , 20,45,38,412,0 Precipitate bs0,10,34,15,63,2 Tablitsa2 flow of water extract, kg / m, when the amount of the consolidant in the mass OBR, wt.% at content of portland cement / at content- / filtroperlit 100/100 - nii portland cement / filtroperlit, 200/100 7 G , 3620.2810.295 , 286.0,1320,125 Sediment BSV0,1030,026 0.18 Compiled by L. Bestuzhev and Editor N. Gunko Tehred L. Oliynyk Proof-reader I. Erdeyi Order 736/25 Circulation 646 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and Printing Enterprise, Uzhgorod, st. Projectyp,