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Ultra-high temperature-resistant anionic polymer fluid loss additive for drilling fluid and completion fluid and preparation method thereof

A fluid loss reducer, anionic technology, applied in the field of drilling fluid and completion fluid, can solve the problems of short reaction time, high initiation temperature, low initiation efficiency, etc., achieve good solubility, good rubber protection performance, reduce filtration Lost effect

Active Publication Date: 2018-11-06
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalyst used in this patent document is still a traditional oxidation-reduction initiation system. The initiation efficiency of this initiation system is low, the required initiation temperature is high, and it is not conducive to the relative molecular mass of the product in the reaction process. Carry out effective control, and the "violent polymerization" phenomenon is prone to occur for the vinyl reaction monomers that are prone to polymerization reactions. At the same time, the reaction time required is relatively long, or the reaction time is extremely short; The synthesized product can only reduce the fluid loss of drilling fluid by 50-80% under the influence of subcritical water property changes in high temperature and high pressure environment

Method used

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  • Ultra-high temperature-resistant anionic polymer fluid loss additive for drilling fluid and completion fluid and preparation method thereof
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  • Ultra-high temperature-resistant anionic polymer fluid loss additive for drilling fluid and completion fluid and preparation method thereof

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Embodiment 1

[0045] Weigh 64.8 grams of acrylamide and 43.0 grams of dimethylaminoethyl methacrylate in a 2.5-liter reactor equipped with a stirrer, reflux condenser, nitrogen protection device, temperature sensor and heating device, and pour into the reaction kettle, add 500 ml of tap water, and stir at a high speed to make it fully dissolved; weigh 132.2 grams of 2-acrylamide-2-methylpropanesulfonic acid and dissolve it in 300 ml of tap water, and then use 10-14 mol / liter Adjust the pH to 7 with the NaOH solution and pour it into the reaction kettle; fully stir the reactant mixture in the reaction kettle. Take by weighing 0.72 gram of azobisisobutylamidine hydrochloride and be dissolved in 100 milliliters of tap water, be placed in reactor after stirring and dissolving completely; In reactor, supplement tap water addition to 1600 milliliters, control reactant total concentration is 15%, the solution in the reactor was stirred rapidly for 5 minutes. Under the protection of nitrogen, stir...

Embodiment 2

[0048] Add 1000 kg of tap water to a stainless steel corrosion-resistant reaction kettle with a capacity of 3-3.5 tons equipped with a stirrer, reflux condenser, nitrogen protection device, thermometer and heating device, turn on the stirrer, and add at a rate of 25 kg / min 2-acrylamide-2-methyl-propanesulfonic acid is 211.8kg, stir for 10 minutes, add sodium hydroxide solid at a rate of 5 kg / min, adjust the pH value to 7-7.5, add tap water to 1500 kg, control the temperature below 40°C; add 96.3 kg of acrylamide at a rate of 25 kg / min, add 500 kg of tap water, and stir for 10 minutes; then add 53.2 kg of dimethylaminoethyl methacrylate, and stir for 5 minutes; Weigh 1.038 kg of azobisisobutylamidine hydrochloride, dissolve it in 25 kg of tap water, and pour it into a reaction kettle. Continue to add tap water to the reaction kettle until the total weight of tap water is 2400kg, blow nitrogen, stir for 30 minutes, then heat up to 55-58°C, react for 4 hours and cool to room temp...

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Abstract

The invention relates to an ultra-high temperature-resistant anionic polymer fluid loss additive for drilling fluid and completion fluid and a preparation method thereof. The ultra-high temperature-resistant and salt-resistant polymer fluid loss additive is a terpolymer prepared by aqueous solution polymerization reaction of alkenyl monomer acrylamide, strongly hydrophilic anionic alkenyl monomer2-acrylamide-2-methylpropanesulfonic acid and alkenyl monomer 2-(dimethylamino)ethyl methacrylate. The molar ratio of anionic alkenyl monomer 2-acrylamide-2-methylpropanesulfonic acid in molecular chain units of the terpolymer is up to 35%-42.5%, and the anionic alkenyl monomer has high hydrophilicity and solubility. The molecular chain of the polymer contains 1,400 to 2,000 structural units. Theweight average molecular weight is 650,000 to 850,000, and number average molecular weight is 600,000 to 700,000. The fluid loss additive provided by the invention has good solubility in the ultra-high temperature water-based drilling fluid, and the temperature-resistant capability reaches 248 DEG C. The small amount of addition can significantly reduce the fluid loss of the water-based drilling fluid and completion fluid under ultra-high temperature conditions and can enable the drilling fluid and completion fluid to maintain good colloidal stability under ultra-high temperature conditions.

Description

Technical field: [0001] The invention relates to an ultra-high temperature resistant anionic polymer fluid loss reducer and a preparation method thereof, and belongs to the technical field of drilling fluid and well completion fluid in oil and natural gas drilling engineering, exploration and development of deep earth resources, and geothermal well drilling engineering. Background technique: [0002] As the world's oil and natural gas exploration and development gradually expand to deep oil and gas resources, my country's deep resource exploration, continental scientific drilling projects, deep earth exploration programs and other major deep-earth projects continue to advance, as well as the exploration, development and utilization of geothermal resources, Ultra-high temperature water-based drilling fluid and completion fluid technology has become one of the core technologies in this type of drilling engineering. At present, the ultra-high temperature water-based drilling flu...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08F220/38C08F220/56C08F220/34
CPCC08F220/38C08F220/385C09K8/035C08F220/56C08F220/34
Inventor 毛惠邱正松黄维安何勇明刘伟邓虎成
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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