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High temperature and salt resistant fluid loss reducer for drilling fluid and preparation method thereof

A fluid loss reducer, high temperature resistant technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of inability to take into account rheology, increase production costs, and high production costs, and achieve high-efficiency resistance to high temperature fluid loss reduction. The effect of reducing the production cost and improving the production efficiency

Active Publication Date: 2017-10-20
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, 2-acrylamido-2-methylpropanesulfonic acid (AMPS) copolymer fluid loss reducer is the most eye-catching among the high-temperature resistant fluid loss reducers commonly used in drilling fluids. It has good temperature and salt resistance, but it cannot be balanced Rheology
In addition, most of the anti-high temperature fluid loss reducers reported in the literature are synthesized by solution polymerization method, the reaction rate is low, the polymerization time is long, and the product dosage is large, which greatly increases the production cost
Wu Yumin et al. reported a temperature-resistant and salt-resistant fluid loss additive AMPS / AM / IA copolymer prepared by solution polymerization and its performance test of fluid loss control in fresh water, brine, composite brine and saturated brine drilling fluid systems , but from the perspective of actual production, the price of monomer raw material AMPS is 3-5 times higher than that of other monomers, the proportion of AMPS in the formula reaches 30%, and the reaction time is 6h. The additive amount of the agent in the drilling fluid is 1.2%, so the production cost is higher

Method used

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  • High temperature and salt resistant fluid loss reducer for drilling fluid and preparation method thereof
  • High temperature and salt resistant fluid loss reducer for drilling fluid and preparation method thereof
  • High temperature and salt resistant fluid loss reducer for drilling fluid and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Add 2g of special monomer into 134mL of deionized water, stir to dissolve completely, add 25.2g of acrylamide, 24g of 2-acrylamido-2-methylpropanesulfonic acid, 10.8g of itaconic acid, stir to dissolve into the total A mixed aqueous solution with a concentration of about 30% by mass.

[0041] (2) Add the mixed solution to the reactor, add 2.4 mL of 5 wt% EDTA solution, stir and heat up, and pass nitrogen for protection for 30 minutes;

[0042] (3) The temperature was increased to 55°C, and 3wt% of ammonium persulfate and 2 mL of sodium bisulfite were added, maintaining the reaction temperature, and reacting for 4 hours;

[0043] (4) Add 5g NaOH and 2mL isopropanol, stir well for 30min to obtain a viscous liquid;

[0044] (5) The viscous liquid is washed with absolute ethanol to obtain a white precipitate, dried at 105°C and pulverized to obtain a high temperature resistant fluid loss agent for drilling fluid.

Embodiment 2

[0046] (1) Add 1.5g of special monomer to 124mL of deionized water, stir to dissolve completely, add 29.4g of acrylamide, 28g of 2-acrylamido-2-methylpropanesulfonic acid, 12.6g of itaconic acid, stir to dissolve into A mixed aqueous solution with a total mass percentage concentration of about 35%.

[0047] (2) Put the mixed solution into the reactor, add 2.8mL 5wt% EDTA solution, stir and raise the temperature, and pass nitrogen protection for 40min;

[0048] (3) The temperature was raised to 50°C, and 2.3 mL each of 3wt% ammonium persulfate and sodium bisulfite were added, the reaction temperature was maintained, and the reaction was carried out for 5 hours;

[0049] (4) Add 6g NaOH and 2mL isopropanol, stir well for 20min to obtain a viscous liquid;

[0050] (5) The viscous liquid is washed with absolute ethanol to obtain a white precipitate, dried at 105°C and pulverized to obtain a high temperature resistant fluid loss agent for drilling fluid.

Embodiment 3

[0052] (1) Add 1.5g of special monomer into 134mL of deionized water, stir to dissolve completely, add 25.2g of acrylamide, 24g of 2-acrylamido-2-methylpropanesulfonic acid, 10.8g of itaconic acid, stir to dissolve into A mixed aqueous solution with a total mass percentage concentration of about 30%.

[0053] (2) Add the mixed solution to the reactor, add 2.4 mL of 5 wt% EDTA solution, stir and increase the temperature, and pass nitrogen for protection for 40 minutes;

[0054] (3) The temperature was increased to 55°C, 3wt% ammonium persulfate and sodium bisulfite each 3mL were added, the reaction temperature was maintained, and the reaction was carried out for 4.5h;

[0055] (4) Add 2.5g Na 2 CO 3 And 2mL 1,4-butanediol, fully stirred for 30min, to obtain a viscous liquid;

[0056] (5) The viscous liquid is washed with absolute ethanol to obtain a white precipitate, dried at 105°C and pulverized to obtain a high temperature resistant fluid loss agent for drilling fluid.

[0057] Perfo...

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Abstract

The invention discloses a high-temperature resistant and salt-tolerance filtrate reducer for drilling fluid. The method comprises the following steps: copolymerizing three monomers, namely acrylamide, 2-acrylamido-2-methyl-propanesulfonic acid and itaconic acid by using an emulsion polymerization method to obtain a copolymer, and then hydrolyzing under an alkaline condition; and participating and drying to obtain the filtrate reducer. The filtrate reducer has relatively good thermal stability and strong temperature resistance; after 0.5%-1% of high-temperature resistant filtrate reducer is added, the filtrate reducer disclosed by the invention has a good filtration reduction effect in fresh water, saline water, composite saline water and saturated brine drilling liquid. The invention also provides an emulsion polymerization method of the high-temperature resistant and salt-tolerance filtrate reducer for the drilling fluid. In comparison with a conventional polymerization method, the polymerization method disclosed by the invention has the advantages that the polymerization rate and the polymerization degree are obviously improved, the reaction time is obviously reduced, and the production cost is reduced under the premise of good product properties.

Description

Technical field [0001] The invention relates to the field of oil and natural gas drilling, in particular to a high-temperature and salt-resistant fluid loss reducer for drilling fluids and a preparation method thereof. Background technique [0002] Filtrate reducer is an important type of drilling fluid additive in oil and gas field operations. With the development of exploration and development to deep formations, the number of deep wells and ultra-deep wells is increasing, and the bottom hole temperature is also getting higher and higher, which brings great challenges to whether the drilling fluid can maintain stable performance. Although oil-based drilling fluid has the advantages of high temperature resistance and good lubrication performance, it also has the problems of serious pollution, high cost, and high safety risks. Therefore, the development of high-temperature resistant water-based drilling fluids has received much attention. The key to resistance to high temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/24C08F220/56C08F220/58C08F222/02C08F2/30C08F2/38
CPCC08F2/30C08F220/56C09K8/24C08F220/585C08F222/02
Inventor 田惠黄峰王野张国兴崔福员
Owner BC P INC CHINA NAT PETROLEUM CORP
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