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Filtrate reducer for drilling fluid as well as preparation method and application thereof

A technology of fluid loss reducer and drilling fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve problems such as abnormal drilling work, excessive addition, and increased economic costs

Inactive Publication Date: 2018-11-09
张建华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many kinds of fluid loss control agents used in the field, and most of them are used in the environment below 180°C. When the environment is above 200°C, the fluid loss control effect is significantly reduced. In order to ensure the fluid loss control effect of drilling fluid, it is necessary to increase oilfield chemical However, if the amount is too much, it will not only increase the economic cost, but also the rheological properties of the drilling fluid will change greatly, so that the drilling work cannot be carried out normally.
In addition, salt and calcium resistance are generally poor, and some fluid loss reducers meet the temperature resistance requirements, but the mud water loss in saturated NaCl solution exceeds 40ml
In addition, there are problems such as out of control of viscosity due to soil phase, clogging, and contamination of oil and gas reservoirs.

Method used

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  • Filtrate reducer for drilling fluid as well as preparation method and application thereof
  • Filtrate reducer for drilling fluid as well as preparation method and application thereof
  • Filtrate reducer for drilling fluid as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Prepare according to the composition ratio of Table 1, specifically:

[0075] (1) Add water, starch, tetrahydrofuran and maleic anhydride to the reaction kettle and stir, adjust the pH to 7, raise the temperature to 50°C and keep it for 4h;

[0076] (2) Continue to add acrylamidopropyltrimethoxysilane, 2-acrylamide-2-methylpropanesulfonic acid, dimethyl sulfoxide and N-benzyl-3-pyrrolidone to the reactor, and then pass into nitrogen After 1.5h, add ammonium persulfate, sodium bisulfite and alkyl betaine under the protection of nitrogen atmosphere, raise the temperature to 60°C and stir for 5h at a speed of 1200r / min;

[0077] (3) Cool to room temperature, shear and granulate, dry and pulverize to obtain fluid loss reducer for drilling fluid.

Embodiment 2

[0079] Prepare according to the composition ratio of Table 1, specifically:

[0080] (1) Add water, starch, tetrahydrofuran and maleic anhydride to the reaction kettle and stir, adjust the pH to 10, raise the temperature to 60°C and keep it for 3h;

[0081] (2) Continue to add acrylamidopropyltrimethoxysilane, 2-acrylamide-2-methylpropanesulfonic acid, dimethyl sulfoxide and N-benzyl-3-pyrrolidone to the reactor, and then pass into nitrogen After 1h, ammonium persulfate, sodium bisulfite and alkyl betaine were added under the protection of nitrogen atmosphere, the temperature was raised to 70°C and stirred at a speed of 1000r / min for 7h;

[0082] (3) Cool to room temperature, shear and granulate, dry and pulverize to obtain fluid loss reducer for drilling fluid.

Embodiment 3

[0084] Prepare according to the composition ratio of Table 1, specifically:

[0085] (1) Add water, starch, tetrahydrofuran and maleic anhydride to the reaction kettle and stir, adjust the pH to 8, raise the temperature to 70°C and keep it for 2h;

[0086] (2) Continue to add acrylamidopropyltrimethoxysilane, 2-acrylamide-2-methylpropanesulfonic acid, dimethyl sulfoxide and N-benzyl-3-pyrrolidone to the reactor, and then pass into nitrogen After 0.5h, add ammonium persulfate, sodium bisulfite and alkyl betaine under the protection of nitrogen atmosphere, raise the temperature to 80°C and stir at a speed of 800r / min for 6h;

[0087] (3) Cool to room temperature, shear and granulate, dry and pulverize to obtain fluid loss reducer for drilling fluid.

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Abstract

The invention discloses a filtrate reducer for drilling fluid as well as a preparation method and application thereof. The filtrate reducer disclosed by the invention comprises the following raw material components in parts by weight: 25-30 parts of starch, 3-5 parts of tetrahydrofuran, 0.25-0.5 part of maleic anhydride, 20-30 parts of acrylamide propyl trimethoxysilane, 5-15 parts of 2-acrylamido-2-methylpropane sulfonic acid, 0.3-0.5 part of dimethyl sulfoxide, 5-10 parts of N-benzyl-3-pyrrolidone, 5-10 parts of ammonium persulfate, 5-10 parts of sodium hydrogen sulfite, 10-20 parts of alkyldimethyl betaine and 100 parts of water. The filtrate reducer disclosed by the invention achieves an excellent effect of reducing the filter loss in a clay free phase high-density drilling fluid system, and has excellent salt and calcium resistance and high pollution resistance; the filtrate reducer has an obvious effect of reducing the filter loss, is excellent in temperature and salt resistanteffect and has an excellent suspension effect on the solid phase; and the tackifying amplitude is moderate in the drilling fluid system, and field application requirements are well met.

Description

technical field [0001] The invention belongs to the technical field of downhole operations in oil and gas fields, and in particular relates to a fluid loss reducer and its preparation method and application, in particular to a fluid loss reducer for drilling fluid and its preparation method and application. 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 ...

Claims

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Application Information

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IPC IPC(8): C09K8/03
CPCC09K8/03
Inventor 张建华
Owner 张建华
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