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Flow pattern regulator for ultra-high temperature and ultra-high density water-based drilling fluid completion fluid and preparation method thereof

A technology of flow pattern regulator and water-based drilling fluid, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature resistance and low temperature resistance, and can reduce viscosity and increase space. The effect of resistance and coalescence inhibition properties

Active Publication Date: 2021-01-01
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example: when some low-molecular-weight polymer products are used as flow regulators or viscosity reducers for high-temperature and high-density water-based drilling and completion fluids, they are limited by their specific molecular structures and mainly face temperature resistance. Poor technical problem, when the temperature exceeds 180°C, it will generally cause its failure due to high temperature, so the temperature resistance of the flow pattern regulator for this type of drilling fluid and completion fluid is usually lower than 180°C, therefore, it is also not Not suitable for ultra-high temperature and ultra-high density water-based drilling fluid and completion fluid

Method used

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  • Flow pattern regulator for ultra-high temperature and ultra-high density water-based drilling fluid completion fluid and preparation method thereof
  • Flow pattern regulator for ultra-high temperature and ultra-high density water-based drilling fluid completion fluid and preparation method thereof
  • Flow pattern regulator for ultra-high temperature and ultra-high density water-based drilling fluid completion fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The sodium alkenylbenzene sulfonate that takes 56.68 grams is added in the capacity that agitator, reflux condenser, nitrogen protection device, temperature sensor and heating device are housed are in the reactor of 2.5 liters, add the tap water of 500 milliliters, open stirring device, Stir at high speed to make it fully dissolve; weigh 392 grams of allyl polyoxyethylene ether (the number of repeating chains of polyoxyalkyl groups m=12-15) and pour it into the reactor; weigh 22.43 grams of methacryl Oxyethyltrimethylammonium chloride was poured into the reactor and stirred at high speed for 10 minutes; 18.89 grams of ammonium persulfate was weighed and fully dissolved in 200 ml of tap water, poured into the reactor and stirred evenly at high speed, Then add tap water until the total amount of tap water reaches 1575 ml; pass nitrogen gas, stir at high speed for 5 minutes, then heat up to 78-83°C, react for 4 hours and cool to room temperature to obtain the ultra-high tem...

Embodiment 2

[0044] To the capacity that agitator, reflux condenser, nitrogen protection device, temperature sensor and heating device are equipped with is the reaction kettle of 1.5 liters to take by weighing 61.8 grams of sodium alkenyl benzene sulfonate, add 600 milliliters of tap water, open stirring device, Stir at a high speed to make it fully dissolve; weigh 216 grams of allyl polyoxyethylene ether (the number of repeating chains of the polyoxyalkyl group m=5-9) and pour it into the reactor; weigh 18.1 grams of methacryl Pour oxyethyltrimethylammonium chloride into the reaction kettle and stir at high speed for 10 minutes; weigh 3.55 grams of azobisisobutylamidine hydrochloride and fully dissolve it in 100 ml of tap water, and pour it into the reaction kettle Stir evenly at medium and high speed, then add tap water until the total amount of tap water reaches 850 ml, blow nitrogen, stir at high speed for 5 minutes, then heat up to 63-68°C, react for 4 hours, and cool to room temperatu...

Embodiment 3

[0047] Add 500 kg of tap water to a stainless steel corrosion-resistant reaction kettle with a capacity of 3-3.5 tons equipped with a stirrer, a reflux condenser, a nitrogen protection device, a thermometer and a heating device, and then turn on the stirrer at a rate of 25 kg / min. The sodium p-styrenesulfonate of 142 kilograms is added in the reactor, is stirred to dissolving evenly; With the speed of 50 kilograms / min, the allyl polyoxyethylene ether of 497 kilograms (number of repeated chains m=5 of polyoxyalkylene group) -9) Add it to the reaction kettle and stir for 10 minutes; then add 41.5 kg of methacryloyloxyethyltrimethylammonium chloride into the reaction kettle and stir at high speed for 10 minutes; weigh 8.166 kg of azobisiso Butyamidine hydrochloride is fully dissolved in 100 kg of tap water, poured into the reaction kettle, and stirred for 10 minutes; the total weight of tap water is added to 1950 kg, nitrogen gas is passed, and the temperature is raised to 65-70°C...

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Abstract

The invention relates to a polycarboxylate flow regulator for water-based drilling fluid and completion fluid with ultra-high temperature and ultra-high density and a preparation method of the polycarboxylate flow regulator. A zwitterionic polycarboxylate multi-polymer with a comb type structure is produced from alkenyl benzene sulfonate, strongly hydrophilic cationic alkenyl quaternary ammonium salt and allyl polyoxyethylene ether containing a specific long chain structure by free radical polymerization in an aqueous solution. A molecular chain of the produced multi-polymer contains 7-20 structural units with weight-average molecular weight in the range of 6,500-12,500. The polycarboxylate flow regulator can greatly reduce viscosity and shear force of the water-based drilling fluid and completion fluid with ultra-high temperature and ultra-high density, improve the dispersion state of solid phase weighting materials in the water-based drilling fluid and completion fluid, improve the rheological property of the water-based drilling fluid and completion fluid with ultra-high temperature and ultra-high density, obviously reduce surface tension of the water-based drilling fluid and completion fluid with ultra-high temperature and improve lubricating performance of the water-based drilling fluid with ultra-high temperature and ultra-high density, has shale inhibition performance and high temperature stability performance, and can resist high temperatures of 251 DEG C or higher.

Description

Technical field: [0001] The invention relates to a flow pattern regulator for an ultra-high temperature and ultra-high density water-based drilling fluid completion fluid and a preparation method thereof, belonging to drilling fluid and completion in oil and natural gas drilling engineering, exploration and development of deep earth resources, and geothermal well drilling engineering. Well fluid technology field. Background technique: [0002] In recent years, with the in-depth development of oil and gas exploration and development in the world and the continuous advancement of major deep-earth projects such as my country's deep resource exploration, continental scientific drilling projects, and deep earth exploration programs, as well as the ultra-high temperature reservoirs encountered in geothermal well drilling projects There are more and more layers, and the probability of encountering ultra-high-pressure formations (formation pore pressure exceeding 138MPa) and ultra-hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F212/14C08F220/28C08F220/34
CPCC08F212/14C09K8/035C09K2208/34C08F220/286C08F220/34
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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