Temperature-resistant and salt-resistant fluid loss reducer for drilling fluid and preparation method thereof

Abstract

The invention discloses a temperature-resistant and salt-resistant fluid loss reducing agent for drilling fluid and a preparation method thereof. The fluid loss reducing agent is made of the following raw materials in parts by weight: 80-100 parts of carboxymethyl cellulose sodium, 30-100 parts 50 parts of natural asphalt, 40-60 parts of sulfonated asphalt, 15-30 parts of sulfonated nitro humic acid, 50-70 parts of sulfonated phenolic resin, 20-40 parts of water-based acrylic resin, 6-10 parts of initiator and 10 parts -40 parts of water, the preparation method is: Stir 1 / 2 of the initiator, water, natural asphalt and sulfonated phenolic resin at 100-120°C for 1.5-2h, then add sulfonated asphalt and sulfonated nitro humic Acid, stir for 20-40min, then adjust the temperature to 60-70°C, add the remaining 1 / 2 initiator and water-based acrylic resin, stir for 2-2.5h, adjust the temperature to 45-55°C, add sodium carboxymethylcellulose , stirred for 3-4 hours, dried and pulverized to obtain the temperature-resistant and salt-resistant fluid loss additive for drilling fluid. The invention has the advantages of being able to effectively reduce the water loss of the drilling fluid and at the same time be resistant to temperature and salt.

Description

technical field

[0001] The invention relates to the technical field of additives for drilling fluids, more specifically, it relates to a temperature-resistant, salt-resistant fluid loss reducing agent for drilling fluids and a preparation method thereof. Background technique

[0002] With the rapid development of China's economy, the consumption of oil and gas resources has risen sharply, and it is urgent to realize new breakthroughs in the exploration and development of oil and gas resources. In order to realize my country's oil and gas resources strategy and development goals, oil and gas exploration and development in deep formations has become an inevitable development trend under the current situation. At present, the number of deep wells and ultra-deep wells drilled in the world is increasing. With the increase of formation depth, the geological conditions of deep formations are more harsh, and the temperature of the bottom of the well is getting higher and higher, whi...

Examples

preparation example 1

[0032] A preparation method of water-based acrylic resin, comprising the following steps:

[0033] Wash the monomer styrene and butyl acrylate with 5wt% sodium hydroxide solution until colorless, then wash with distilled water until neutral, carry out oil-water separation, and then pass the washed monomer through anhydrous sulfuric acid Sodium sand core funnel to remove water;

[0034] In grams by weight, dissolve 280g of styrene after washing, 100g of butyl acrylate, 20g of acrylic acid and 5.5g of emulsifier in 100g of water to prepare a pre-emulsion, then add 0.2g of potassium persulfate, and add the above-mentioned potassium persulfate The pre-emulsion was added dropwise to 300g of water at 70°C, stirred, and reacted for 2.5 hours, then kept warm for 45 minutes and adjusted to a pH value of 8, then washed with ethanol and distilled water successively, dried, and crushed to obtain a water-based acrylic resin, wherein the emulsifier was Nonylphenol polyoxyethylene ether NP-...

preparation example 2

[0036] A kind of preparation method of water-based acrylic resin is carried out according to the method in Preparation Example 1, the difference is that

[0037] Wash the monomer styrene and butyl acrylate with 5wt% sodium hydroxide solution until colorless, then wash with distilled water until neutral, carry out oil-water separation, and then pass the washed monomer through anhydrous sulfuric acid Sodium sand core funnel to remove water;

[0038] In terms of g by weight, 250g of styrene after washing, 80g of butyl acrylate, 15g of acrylic acid and 5g of emulsifier were dissolved in 90g of water to prepare a pre-emulsion, and then 0.1g of potassium persulfate was added. Add the pre-emulsion dropwise to 280g water at 65°C, stir, react for 2 hours, then keep it warm for 0.5 hours and adjust the pH value to 8, then wash with ethanol and distilled water successively, dry, and pulverize to obtain a water-based acrylic resin, in which the emulsifier is mass Nonylphenol ethoxylate N...

preparation example 3

[0040] A preparation method of water-based acrylic resin, comprising the following steps:

[0041] Wash the monomer styrene and butyl acrylate with 5wt% sodium hydroxide solution until colorless, then wash with distilled water until neutral, carry out oil-water separation, and then pass the washed monomer through anhydrous sulfuric acid Sodium sand core funnel to remove water;

[0042] In grams by weight, 300g of styrene after washing, 120g of butyl acrylate, 25g of acrylic acid and 6g of emulsifier were dissolved in 120g of water to prepare a pre-emulsion, and then 0.3g of potassium persulfate was added. Add the pre-emulsion dropwise to 330g water at 75°C, stir, react for 3 hours, then keep it warm for 1 hour and adjust the pH value to 8, then wash with ethanol and distilled water successively, dry, and pulverize to obtain a water-based acrylic resin, wherein the emulsifier is the mass ratio It is 2:3 nonylphenol polyoxyethylene ether NP-10 and octylphenol polyoxyethylene et...

technical field

[0001] The invention relates to the technical field of additives for drilling fluids, more specifically, it relates to a temperature-resistant, salt-resistant fluid loss reducing agent for drilling fluids and a preparation method thereof. Background technique

[0002] With the rapid development of China's economy, the consumption of oil and gas resources has risen sharply, and it is urgent to realize new breakthroughs in the exploration and development of oil and gas resources. In order to realize my country's oil and gas resources strategy and development goals, oil and gas exploration and development in deep formations has become an inevitable development trend under the current situation. At present, the number of deep wells and ultra-deep wells drilled in the world is increasing. With the increase of formation depth, the geological conditions of deep formations are more harsh, and the temperature of the bottom of the well is getting higher and higher, whi...

Examples

preparation example 1

[0032] A preparation method of water-based acrylic resin, comprising the following steps:

[0033] Wash the monomer styrene and butyl acrylate with 5wt% sodium hydroxide solution until colorless, then wash with distilled water until neutral, carry out oil-water separation, and then pass the washed monomer through anhydrous sulfuric acid Sodium sand core funnel to remove water;

[0034] In grams by weight, dissolve 280g of styrene after washing, 100g of butyl acrylate, 20g of acrylic acid and 5.5g of emulsifier in 100g of water to prepare a pre-emulsion, then add 0.2g of potassium persulfate, and add the above-mentioned potassium persulfate The pre-emulsion was added dropwise to 300g of water at 70°C, stirred, and reacted for 2.5 hours, then kept warm for 45 minutes and adjusted to a pH value of 8, then washed with ethanol and distilled water successively, dried, and crushed to obtain a water-based acrylic resin, wherein the emulsifier was Nonylphenol polyoxyethylene ether NP-...

preparation example 2

[0036] A kind of preparation method of water-based acrylic resin is carried out according to the method in Preparation Example 1, the difference is that

[0037] Wash the monomer styrene and butyl acrylate with 5wt% sodium hydroxide solution until colorless, then wash with distilled water until neutral, carry out oil-water separation, and then pass the washed monomer through anhydrous sulfuric acid Sodium sand core funnel to remove water;

[0038] In terms of g by weight, 250g of styrene after washing, 80g of butyl acrylate, 15g of acrylic acid and 5g of emulsifier were dissolved in 90g of water to prepare a pre-emulsion, and then 0.1g of potassium persulfate was added. Add the pre-emulsion dropwise to 280g water at 65°C, stir, react for 2 hours, then keep it warm for 0.5 hours and adjust the pH value to 8, then wash with ethanol and distilled water successively, dry, and pulverize to obtain a water-based acrylic resin, in which the emulsifier is mass Nonylphenol ethoxylate N...

preparation example 3

[0040] A preparation method of water-based acrylic resin, comprising the following steps:

[0041] Wash the monomer styrene and butyl acrylate with 5wt% sodium hydroxide solution until colorless, then wash with distilled water until neutral, carry out oil-water separation, and then pass the washed monomer through anhydrous sulfuric acid Sodium sand core funnel to remove water;

[0042] In grams by weight, 300g of styrene after washing, 120g of butyl acrylate, 25g of acrylic acid and 6g of emulsifier were dissolved in 120g of water to prepare a pre-emulsion, and then 0.3g of potassium persulfate was added. Add the pre-emulsion dropwise to 330g water at 75°C, stir, react for 3 hours, then keep it warm for 1 hour and adjust the pH value to 8, then wash with ethanol and distilled water successively, dry, and pulverize to obtain a water-based acrylic resin, wherein the emulsifier is the mass ratio It is 2:3 nonylphenol polyoxyethylene ether NP-10 and octylphenol polyoxyethylene et...