Solidification stabilizing material for water-based drilling cutting landfill and solidification method of water-based drilling cutting

Abstract

The invention discloses a solidification stabilizing material for water-based drilling cutting landfill and a solidification method of water-based drilling cutting. The solidification stabilizing material comprises coal cinder, cement, carbide slag, gypsum, a metal ion solidification unit and an oxidation unit. The metal ion curing unit comprises a metal ion curing agent and dithioamino salt, and the oxidation unit comprises citric acid, H2O2 and ferrous ion metal salt. According to the method, citric acid which can be decomposed by itself and is high in acidity is used for adjusting the pH value of the water-based drilling cuttings, so that traditional Fenton oxidation is changed, Fenton oxidation reaction is activated in the environment with the pH value of 6-7, and the degradation capacity of organic matter in the water-based drilling cuttings is improved; on the other hand, the chelation reaction between the dithioamino salt and heavy metal ions is promoted, so that more heavy metal ions form chelate precipitates, and meanwhile, the chelate precipitates and arsenic are subjected to complexation reaction; and the formed chelate and complex are coated by inorganic silicate formed by the metal ion curing agent and water, thereby avoiding environmental hazards caused by escape of harmful substances.

Description

technical field

[0001] The invention belongs to the technical field of environment-friendly curing and stabilizing materials, and in particular relates to a curing and stabilizing material for water-based drilling cuttings landfill and a curing method for water-based drilling cuttings. Background technique

[0002] Water-based drilling cuttings are rock / mineral particles that are ground or broken by the drill bit during drilling in oil and gas fields. They are brought out of the ground by the circulating flushing fluid from the well, and contain a mixture of cuttings such as clay, weighting materials, and various treatment agents, mainly including Small gravel, clay, shale and sand, etc. In addition, a small amount of drilling fluid will adhere to the surface of the drill cuttings discharged, and its main component is SiO 2 、Al 2 o 3 , Fe 2 o 3 , CaO, etc., similar to the chemical composition of clay, and mainly clay minerals. In addition, the water-based drilling cutti...

Examples

preparation example Construction

[0030] Its concrete preparation steps are as follows:

[0031] Step S1: Thoroughly mix p-hydroxyphenylglycine (or hydroxyphenylglycine), ammonium sulfate and sodium hydroxide solution to obtain a mixture.

[0032] Step S2: Then heat the mixture obtained in step S1 to 80-90° C. and evaporate ammonia under vacuum until the content of ammonium sulfate is less than 1%.

[0033] Step S3: On the basis of step S2, cool down to 30°C, then add carbon disulfide (CS 2 ) and warming up to 50-60 degrees Celsius to react for 6-8 hours to obtain sodium p-hydroxyphenylglycine dithiocarbamate or sodium hydroxyphenylglycine dithiocarbamate.

Embodiment 1

[0037] A solidification and stabilization material for water-based drilling cuttings landfill, comprising the following components in parts by weight: 30 parts of cinder, 18 parts of cement, 12 parts of carbide slag, 10 parts of citrate gypsum, and 3 parts of metal ion curing agent , 3 parts of sodium hydroxyphenylglycine dithiocarbamate, 15 parts of oxidation unit.

[0038]Specifically, the metal ion curing agent includes microsilica, diatomaceous earth and sodium silicate; and the mass ratio of microsilica, diatomaceous earth and sodium silicate is 10:30:4. The oxidation unit includes citric acid, H 2 o 2 and FeSO 4 , where citric acid adjusted the pH of water-based cuttings to 6-7, H 2 o 2 and Fe 2+ The molar ratio is 2:83.

[0039] Further, when the above-mentioned solidified and stable material for water-based drill cuttings landfill is used for water-based drill cuttings solidification, it specifically includes the following steps:

[0040] Step 1: first the oxida...

Embodiment 2

[0044] A solidification and stabilization material for water-based drilling cuttings landfill, comprising the following components in parts by weight: 50 parts of cinder, 25 parts of cement, 18 parts of carbide slag, 16 parts of citrate gypsum, and 6 parts of metal ion curing agent , 4 parts of hydroxyphenylglycine dithiocarbamate sodium salt, 23 parts of oxidation unit.

[0045] Specifically, the metal ion curing agent includes microsilica, diatomaceous earth and sodium silicate; and the mass ratio of microsilica, diatomaceous earth and sodium silicate is 18:55:9. The oxidation unit includes citric acid, H 2 o 2 and FeSO 4 , specifically, citric acid adjusted the pH of water-based cuttings to 6-7, H 2 o 2 and Fe 2+ The molar ratio is 2:91.

[0046] Further, the solidification method of the above-mentioned water-based drilling cuttings embedding solidification and stabilization material in water-based drilling cuttings in this implementation is the same as the steps desc...

technical field

[0001] The invention belongs to the technical field of environment-friendly curing and stabilizing materials, and in particular relates to a curing and stabilizing material for water-based drilling cuttings landfill and a curing method for water-based drilling cuttings. Background technique

[0002] Water-based drilling cuttings are rock / mineral particles that are ground or broken by the drill bit during drilling in oil and gas fields. They are brought out of the ground by the circulating flushing fluid from the well, and contain a mixture of cuttings such as clay, weighting materials, and various treatment agents, mainly including Small gravel, clay, shale and sand, etc. In addition, a small amount of drilling fluid will adhere to the surface of the drill cuttings discharged, and its main component is SiO 2 、Al 2 o 3 , Fe 2 o 3 , CaO, etc., similar to the chemical composition of clay, and mainly clay minerals. In addition, the water-based drilling cutti...

Examples

preparation example Construction

[0030] Its concrete preparation steps are as follows:

[0031] Step S1: Thoroughly mix p-hydroxyphenylglycine (or hydroxyphenylglycine), ammonium sulfate and sodium hydroxide solution to obtain a mixture.

[0032] Step S2: Then heat the mixture obtained in step S1 to 80-90° C. and evaporate ammonia under vacuum until the content of ammonium sulfate is less than 1%.

[0033] Step S3: On the basis of step S2, cool down to 30°C, then add carbon disulfide (CS 2 ) and warming up to 50-60 degrees Celsius to react for 6-8 hours to obtain sodium p-hydroxyphenylglycine dithiocarbamate or sodium hydroxyphenylglycine dithiocarbamate.

Embodiment 1

[0037] A solidification and stabilization material for water-based drilling cuttings landfill, comprising the following components in parts by weight: 30 parts of cinder, 18 parts of cement, 12 parts of carbide slag, 10 parts of citrate gypsum, and 3 parts of metal ion curing agent , 3 parts of sodium hydroxyphenylglycine dithiocarbamate, 15 parts of oxidation unit.

[0038]Specifically, the metal ion curing agent includes microsilica, diatomaceous earth and sodium silicate; and the mass ratio of microsilica, diatomaceous earth and sodium silicate is 10:30:4. The oxidation unit includes citric acid, H 2 o 2 and FeSO 4 , where citric acid adjusted the pH of water-based cuttings to 6-7, H 2 o 2 and Fe 2+ The molar ratio is 2:83.

[0039] Further, when the above-mentioned solidified and stable material for water-based drill cuttings landfill is used for water-based drill cuttings solidification, it specifically includes the following steps:

[0040] Step 1: first the oxida...

Embodiment 2

[0044] A solidification and stabilization material for water-based drilling cuttings landfill, comprising the following components in parts by weight: 50 parts of cinder, 25 parts of cement, 18 parts of carbide slag, 16 parts of citrate gypsum, and 6 parts of metal ion curing agent , 4 parts of hydroxyphenylglycine dithiocarbamate sodium salt, 23 parts of oxidation unit.

[0045] Specifically, the metal ion curing agent includes microsilica, diatomaceous earth and sodium silicate; and the mass ratio of microsilica, diatomaceous earth and sodium silicate is 18:55:9. The oxidation unit includes citric acid, H 2 o 2 and FeSO 4 , specifically, citric acid adjusted the pH of water-based cuttings to 6-7, H 2 o 2 and Fe 2+ The molar ratio is 2:91.

[0046] Further, the solidification method of the above-mentioned water-based drilling cuttings embedding solidification and stabilization material in water-based drilling cuttings in this implementation is the same as the steps desc...

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