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Diluent for high temperature resistant salt-tolerant drilling fluid and preparation method of diluent

A technology of diluent and drilling fluid, which is applied in the field of diluent for high temperature and salt resistance drilling fluid and its preparation, can solve the problems of large livestock and environmental pollution, poor anti-pollution ability, and heavy human and environmental pollution.

Inactive Publication Date: 2015-09-16
MUDANJIANG HUAXIN CHEM ADDITIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Domestic drilling fluid diluent products have the above-mentioned deficiencies, and analyze the reasons and mechanisms, such as the design of lignin without hydroxyl modification, poor thermal stability, and poor anti-pollution ability; the design of lignin without amine modification is harmful to human, Livestock and environmental pollution are relatively large; no sulfonic acid group modification design for lignin, poor viscosity reduction effect under high temperature conditions
At the same time, the operation cost is high, and the pollution to people and the environment is heavy, which seriously restricts its use and development.

Method used

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  • Diluent for high temperature resistant salt-tolerant drilling fluid and preparation method of diluent
  • Diluent for high temperature resistant salt-tolerant drilling fluid and preparation method of diluent
  • Diluent for high temperature resistant salt-tolerant drilling fluid and preparation method of diluent

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Effect test

Embodiment 1

[0058] The specific steps of the preparation method of the high temperature and salt resistant drilling fluid diluent of the present invention are as follows:

[0059] (1) Add 8 parts by weight of water in the batching container, 12 parts by weight of sulfuric acid with a concentration of 92%, 50 parts by weight of ferrous sulfate with a content of 85wt%, after stirring evenly, add 11 parts by weight of a concentration of 35% Hydrogen peroxide, add hydrogen peroxide slowly, keep the temperature below 78°C, and the equivalent concentration of ferric sulfate is 8.0-10.0N;

[0060] (2) adding the concentration of 200 parts by weight to the reaction vessel successively under normal temperature and pressure is the calcium lignosulfonate of 48~50% and the ferric sulfate displacing agent prepared in the step (1), the temperature in the reaction vessel is reduced after feeding Rise to 85°C, keep warm for 30 minutes, filter the replaced liquid material, and remove the precipitated calc...

Embodiment 2

[0065] The specific steps of the preparation method of the high temperature and salt resistant drilling fluid diluent of the present invention are as follows:

[0066] (1) Add 10 parts by weight of water in the batching container, 8 parts by weight of sulfuric acid with a concentration of 92%, 60 parts by weight of ferrous sulfate with a content of 85wt%, after stirring evenly, add 9 parts by weight of a concentration of 35% sulfuric acid Hydrogen peroxide, add hydrogen peroxide slowly, keep the temperature below 78°C, and the equivalent concentration of ferric sulfate is 8.0-10.0N;

[0067] (2) adding the concentration of 220 parts by weight to the reaction vessel successively under normal temperature and pressure is the calcium lignosulfonate of 48~50% and the ferric sulfate displacing agent prepared in the step (1), the temperature in the reaction vessel is reduced after feeding Rise to 85°C, keep warm for 30 minutes, filter the replaced liquid material, and remove the prec...

Embodiment 3

[0072] The specific steps of the preparation method of the high temperature and salt resistant drilling fluid diluent of the present invention are as follows:

[0073] (1) Add 9 parts by weight of water in the batching container, 10 parts by weight of sulfuric acid with a concentration of 92%, 55 parts by weight of ferrous sulfate with a content of 85wt%, after stirring evenly, add 10 parts by weight of a concentration of 35% Hydrogen peroxide, add hydrogen peroxide slowly, keep the temperature below 78°C, and the equivalent concentration of ferric sulfate is 8.0-10.0N;

[0074] (2) add the concentration of 210 weight parts successively to the reaction vessel under normal temperature and pressure and be the calcium lignosulfonate of 48~50% and the ferric sulfate displacing agent prepared in the step (1), the temperature in the reaction vessel will be reduced after feeding Rise to 83°C, keep warm for 35 minutes, filter the replaced liquid material, and remove the precipitated c...

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Abstract

The invention discloses a diluent for a high temperature resistant salt-tolerant drilling fluid and a preparation method of the diluent. The diluent comprises the following raw materials: calcium lignosulphonate, ferrous sulfate, sulfuric acid, manganese dioxide, hydrogen peroxide, humic acid, potassium hydroxide, sodium sulfite, formaldehyde and 2-acrylamide-2-methallyl sulfonate (AMPS). The viscosity reduction rate of the thermal stability test fresh water base slurry of the diluent is greater than 85% after being aged for 16 hours at 180 DEG C, and the viscosity reduction rate of the brine base slurry is greater than 85% after being aged for 16 hours at 180 DEG C.

Description

technical field [0001] The invention relates to the technical field of diluents for drilling fluids, in particular to a diluent for high-temperature and salt-resistant drilling fluids and a preparation method thereof. Background technique [0002] With the in-depth development of oil and gas exploration and development and the increasing expansion of the drilling industry to domestic and foreign markets, the number of deep wells and ultra-deep wells has increased year by year. Ultra-deep well drilling fluid technology puts forward higher requirements. Drilling fluids for ultra-deep wells still face technical problems such as high-temperature rheological properties, stability, multi-control, and safe density of multiple sets of pressure layers. [0003] With the increase of world energy demand and the development of drilling fluid technology, the number of deep wells and ultra-deep wells at home and abroad is also increasing. During the drilling process, the deeper the well...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08F289/00C08F220/58C08H7/00C08H99/00
CPCC09K8/035C08F289/00C08H6/00C08H99/00C08F220/58
Inventor 岳媛赵起迦岳然张利民李丽
Owner MUDANJIANG HUAXIN CHEM ADDITIVE
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