Ultrahigh-temperature-resistant and complex-salt-resistant amphoteric ion hydrophobic association polymer filter loss reducer and preparation method thereof

A fluid loss reducing agent, zwitterion technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of low product conversion rate, poor fluid loss reducing agent effect, low initiation efficiency, etc. Excellent salt performance, improving mud cake quality, suppressing overdispersion effect

Active Publication Date: 2018-10-30
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical and chemical properties of water as the continuous phase of water-based drilling fluid are not considered. Changes in ultra-high temperature and high pressure environments. With the gradual increase of temperature and pressure, water gradually becomes subcritical water, and the dielectric constant of water continues to decrease , indicating that the polarity of water is gradually weakened. Therefore, subcritical water can gradually have a certain solubility for neutral polar and non-polar organic compounds. At the same time, polymer treatment agents with strong hydrophilicity may not be able to It is completely dissolved in subcritical water, leading to the occurrence of thermally induced phase separation; in addition, the hydrogen bonding of water gradually weakens with the gradual increase of temperature and pressure, the surface tension of water also gradually decreases, and the ion content of water The constant increases gradually
Therefore, when designing the molecular structure of polymer fluid loss control agents similar to those in the abov

Method used

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  • Ultrahigh-temperature-resistant and complex-salt-resistant amphoteric ion hydrophobic association polymer filter loss reducer and preparation method thereof
  • Ultrahigh-temperature-resistant and complex-salt-resistant amphoteric ion hydrophobic association polymer filter loss reducer and preparation method thereof
  • Ultrahigh-temperature-resistant and complex-salt-resistant amphoteric ion hydrophobic association polymer filter loss reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Weigh 24.84 grams of 2-acrylamide-2-methyl-propanesulfonic acid into a 1-liter reactor equipped with a stirrer, reflux condenser, nitrogen protection device, temperature sensor and heating device and dissolve it in 120 Adjust the pH to 7 with 14 mol / L NaOH solution in ml of tap water and place it in the reaction kettle; then weigh 18.63 g of methacryloxyethyl trimethylammonium chloride and dissolve it in 50 ml of tap water. After the dissolution is complete, pour it into the reactor, then place the reactor in a 40℃ water bath and stir at low speed; melt the N-vinylcaprolactam in an environment of 40-45℃, and then weigh 3.39 grams of N-vinylcaprolactam Then pour into the reactor and stir quickly for 5 minutes; add tap water mixed with 0.1171 g of azobisisobuimidazoline hydrochloride, then add tap water to adjust the total mass concentration of the reaction monomer to 12%, and stir at high speed under nitrogen protection After 30 minutes, the temperature was raised to 55°C...

Embodiment 2

[0051] Weigh 25.70 grams of 2-acrylamide-2-methyl-propanesulfonic acid into a 1-liter reactor equipped with a stirrer, reflux condenser, nitrogen protection device, temperature sensor and heating device and dissolve it in 150 Adjust the pH to 7-8 with 14 mol / L NaOH solution in ml of tap water and place it in the reactor; then weigh 11.66 g of methacryloxyethyl trimethylammonium chloride and dissolve it in 50 ml of tap water After the dissolution is complete, pour into the reactor, then place the reactor in a 40℃ water bath and stir evenly at low speed; add tap water mixed with 0.1031 g of azoisobutylcyanoformamide, and then add tap water to a total of 276 Then melt the N-vinylcaprolactam in an environment of 40-45℃, then weigh 3.89g of N-vinylcaprolactam and pour it into the reactor, stir quickly for 5 minutes; then measure out 69ml of No. 5 white The oil was added to the reaction kettle, stirred at high speed for 30 minutes under the protection of nitrogen, and then heated to ...

Embodiment 3

[0054] To a stainless steel corrosion-resistant reactor 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, first add 500 kg of tap water, turn on the stirrer, and remove it at a rate of 25 kg / min. 140 kg of 2-acrylamide-2-methyl-propanesulfonic acid was added to the reactor, stirred for 10 minutes, sodium hydroxide solid was added at a rate of 5 kg / min, and the pH was adjusted to 7-8. In the reactor Add tap water to 1500 kg, stir for 10 minutes, add 105 kg of methacryloxyethyl trimethyl ammonium chloride, continue stirring for 10 minutes, then melt N-vinylcaprolactam in an environment of 40-45°C, and then weigh Take 19.2 kg of N-vinylcaprolactam and pour it into the reaction kettle, continue to stir for 10 minutes; add tap water mixed with 0.6605 kg of azobisbuimidazoline hydrochloride, and then continue to add tap water until the total weight of tap water is 2200 kg , Blow nitrogen, stir ...

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Abstract

The invention relates to an ultrahigh-temperature-resistant and complex-salt-resistant amphoteric ion hydrophobic association polymer filter loss reducer and a preparation method thereof. The filter loss reducer is a multipolymer with amphoteric ion hydrophobic association characteristic and is generated by performing polymerization reaction on hydrophobic alkylamide, strong hydrophilic anion alkenyl sulfonate and strong hydrophilic cationic alkenyl quaternary ammonium through a water-soluble azo initiator in an aqueous solution, wherein the generated multipolymer molecular chain contains about 2,000 to 4,000 structural units, and the weight-average molecular weight range is 1,320,000 to 2,100,000. The multipolymer filter loss reducer has high compatibility in an ultrahigh-temperature water-based drilling fluid well completion fluid, can obviously reduce the filter loss quantity of the drilling fluid well completion fluid under the ultrahigh-temperature environment, has temperature resistance capable of reaching 248 DEG C, saturated sodium chloride resistance and excellent complex salt resistance, and can obviously reduce the filter loss quantity in the water-based high-temperaturedrilling fluid with the chloridion concentration higher than 100,000 ppm, calcium ion concentration higher than 5,000 ppm and magnesium ion concentration higher than 5,000 pmm and invaded with acidicgas.

Description

Technical field: [0001] The invention relates to an anti-ultra-high temperature and anti-composite salt-resistant zwitterionic hydrophobic associating polymer fluid loss agent and a preparation method thereof, belonging to oil and natural gas drilling engineering, deep earth resource exploration and development, and geothermal well drilling engineering. Completion fluid technology field. Background technique: [0002] With the in-depth development of oil and gas exploration and development in the world and the continuous advancement of oil and gas resource exploration and development technologies, oil and gas exploration and development areas have gradually developed to ultra-deep layers. In addition, with 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, the geological design well depths in drilling projects have also increased year by year. Theref...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F220/34C08F226/06C09K8/035
CPCC08F220/58C08F220/585C09K8/035C08F220/34C08F226/06
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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