Salt-resistant filtrate-loss reducer for drilling fluid and preparation method of salt-resistant filtrate-loss reducer

A fluid loss control agent and drilling fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of equipment and operators, such as safety, inability to effectively adjust flow patterns, and low polymer molecular weight, etc. Achieve the effect of inhibiting clay dispersion, good compatibility and high charge density

Inactive Publication Date: 2015-04-22
HEBEI GUANGDA PETROCHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent with the patent number ZL 201010172409.3 discloses a preparation method of a high-temperature and salt-resistant fluid loss reducer for drilling fluids. It adopts a single reaction device and copolymerizes two or more functional monomers. During the reaction process, the reaction concentration is too high , the reaction is violent, and there is a safety hazard to the equipment and operators
In addition, due to sudden polymerization, the reaction temperature is high and the reaction time is short, resulting in low molecular weight and low viscosity of the polymer, which cannot effectively adjust the flow pattern, shale cuttings are dispersed, and in severe cases, it will lead to formation slurry and hole diameter shrinkage , well wall collapse, etc.

Method used

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  • Salt-resistant filtrate-loss reducer for drilling fluid and preparation method of salt-resistant filtrate-loss reducer

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Experimental program
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Effect test

Embodiment 1

[0016] An anti-salt fluid loss reducer for drilling fluid, which includes the following raw materials: 2400kg of acrylamide, 240kg of soda ash, 50kg of AMPS, 200kg of calcium hydroxide, and 7.2kg of N, N methylenebisacrylamide.

[0017] The preparation method of the above-mentioned anti-salt fluid loss reducer for drilling fluid:

[0018] (1) Add an appropriate amount of water to the acrylamide and soda ash to make a solution with a total mass concentration of 25%. Under the protection of nitrogen, add 11.2 kg of potassium persulfate to carry out polymerization reaction. Reaction ends; Continue heat preservation hydrolysis reaction 6h to obtain colloid;

[0019] (2) Add the 2-acrylamide-2-methylpropanesulfonic acid, calcium hydroxide and N,N-methyleneacrylamide to the colloid obtained in step (1), and react at 80°C for 5 hours;

[0020] (3) Dry and pulverize the obtained product.

[0021] The performance test of the fluid loss control agent is carried out, and the fluid loss...

Embodiment 2

[0084] An anti-salt fluid loss reducer for drilling fluid, which includes the following raw materials: 3600kg of acrylamide, 180kg of soda ash, 200kg of AMPS, 100kg of calcium hydroxide, and 5kg of N,N methylenebisacrylamide.

[0085] The preparation method of the above-mentioned anti-salt fluid loss reducer for drilling fluid:

[0086] (1) Add an appropriate amount of water to the acrylamide and soda ash to make a solution with a total mass concentration of 35%. Under the protection of nitrogen, add 3.6 kg of potassium persulfate to carry out polymerization reaction. The reaction is over; heating to 80°C for 7 hours of heat preservation and hydrolysis reaction to obtain colloid;

[0087] (2) Add the 2-acrylamide-2-methylpropanesulfonic acid, calcium hydroxide and N,N-methyleneacrylamide to the colloid obtained in step (1), and react at 80°C for 5 hours;

[0088] (3) Dry and pulverize the obtained product.

Embodiment 3

[0090] An anti-salt fluid loss reducer for drilling fluid, which comprises the following raw materials: 3000 kg of acrylamide, 350 kg of soda ash, 300 kg of calcium hydroxide, and 10 kg of N, N methylenebisacrylamide.

[0091] The preparation method of the above-mentioned anti-salt fluid loss reducer for drilling fluid:

[0092] (1) Add an appropriate amount of water to the acrylamide and soda ash to make a solution with a total mass concentration of 30%. Under the protection of nitrogen, add 12 kg of potassium persulfate to carry out polymerization reaction. The reaction is over; adjust the temperature to 80°C and heat-preserve the hydrolysis reaction for 8 hours to obtain the colloid;

[0093] (2) Add the 2-acrylamide-2-methylpropanesulfonic acid, calcium hydroxide and N,N-methyleneacrylamide to the colloid obtained in step (1), and react at 80°C for 4 hours;

[0094] (3) Dry and pulverize the obtained product.

[0095] The performance of the fluid loss control agent obtai...

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Abstract

The invention discloses a salt-resistant filtrate-loss reducer for a drilling fluid. The salt-resistant filtrate-loss reducer comprises the following raw materials: 2400-3600kg of acrylamide, 180-350kg of sodium carbonate, 0-200kg of 2-acrylamide-2-methyl propane sulfonic acid, 100-300kg of hydroxide calcium and 5-10kg of N,N-methylenebisacrylamide. The preparation method of the salt-resistant filtrate-loss reducer comprises the steps of polymerizing the raw materials, modifying and the like. The salt-resistant filtrate-loss reducer has the advantages of proper viscosity, very strong water solubility, good compatibility, low filtrate loss and strong salt resistance and can be used in combination with different drilling fluids, also can be used in various freshwater and saltwater drilling fluids and can inhibit the hydration dispersion of shale; the addition amount of the salt-resistant filtrate-loss reducer in freshwater is 0.2%-0.5% and the addition amount of the salt-resistant filtrate-loss reducer in saltwater is 1.0%-2.0%.

Description

technical field [0001] The invention relates to the field of petrochemicals, in particular to a salt-resistant fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] During the drilling process, due to the pressure difference, the water in the drilling fluid will inevitably leak into the formation through the wellbore wall, causing the drilling fluid to lose water. As the water enters the formation, the clay particles in the drilling fluid adhere to the well wall to form a "filter cake", forming a filter cake well wall. Since the well wall of the filter cake is much denser than the original well wall, on the one hand, it prevents the drilling fluid from further dehydration, and on the other hand, it plays a role in protecting the well wall. However, during the formation of the filter cake wall, too much water is lost by filtration, the filter cake is too thick, and fine clay particles enter the formation with water, which will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F265/10C08F220/58C08F222/38
CPCC08F220/58C08F220/585C08F222/385C08F265/10C09K8/035C09K8/24
Inventor 李尚坤郭九成郭杨高国英罗前程刘君君张宇航张星赤艳峰
Owner HEBEI GUANGDA PETROCHEM
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