Filtrate loss reducer for water-based drilling fluid and preparation method of filtrate loss reducer

A technology of water-based drilling fluid and fluid loss control agent, which is applied in the field of drilling fluid, can solve the problems of hydration effect, viscosity reduction, side effects of shear force, unfavorable rheological adjustment, high polymer dosage, etc., to achieve good fluid loss control Ability, excellent temperature resistance, good dispersion effect

Inactive Publication Date: 2019-11-15
BEIJING SHIDABOCHENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the introduction of sulfonic acid groups improves the hydration effect, but if the hydration effect is too strong, there will be obvious side effects of viscosity reduction and shear force, which is not conducive to rheological adjustment
And the amount of polymer added is too high, and the cost of using it in a high-salt environment will increase sharply

Method used

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  • Filtrate loss reducer for water-based drilling fluid and preparation method of filtrate loss reducer
  • Filtrate loss reducer for water-based drilling fluid and preparation method of filtrate loss reducer
  • Filtrate loss reducer for water-based drilling fluid and preparation method of filtrate loss reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A fluid loss control agent for drilling fluids, in parts by weight, comprising: 20 parts of acrylamide; 6 parts of 2-acrylamido-2-methylpropanesulfonic acid, and methacryloyl propyl trimethyl chloride 5 parts of ammonium, 3 parts of sodium formate, 0.6 parts of sodium hydroxide, 0.04 parts of ammonium persulfate, 80: 6 parts of span, 20: 0.3 parts of span, 40 parts of water, 20 parts of white oil.

[0052] It is prepared by the following steps: under the condition of normal temperature and 25°C, the above-mentioned parts by weight of water, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, methacrylamidotrimethyl Base ammonium chloride, sodium formate, sodium hydroxide, and Span 20 are mixed to prepare the water phase, and white oil and Span 80 are mixed to prepare the oil phase; the water phase and the oil phase are fully mixed to obtain the emulsion base liquid; the emulsion is placed in the reaction After filling the kettle with nitrogen, add initiator and react at...

Embodiment 2

[0072] A fluid loss reducer for drilling fluids, in parts by weight, comprising: 18 parts of acrylamide; 5 parts of 2-acrylamido-2-methylpropanesulfonic acid; methacryloyl propyl trimethyl chloride 4 parts of ammonium, 3 parts of sodium formate, 0.6 parts of sodium hydroxide, 0.04 parts of ammonium persulfate, 80: 5 parts of span, 20: 0.25 parts of span, 40 parts of water, 24 parts of white oil.

[0073] It is prepared by the following steps: under the condition of normal temperature and 25°C, the above-mentioned parts by weight of water, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, methacrylamidotrimethyl Base ammonium chloride, sodium formate, sodium hydroxide, and Span 20 are mixed to prepare an aqueous phase,

[0074] And mixing white oil and Span 80 to prepare an oil phase;

[0075] Fully mix the water phase and the oil phase to obtain an emulsion base liquid; place the emulsion in a reactor, add an initiator after filling with nitrogen, and react at a constant temper...

Embodiment 3

[0091] A fluid loss reducer for drilling fluids, in parts by weight, comprising: 18 parts of acrylamide; 4.8 parts of 2-acrylamido-2-methylpropanesulfonic acid, methacryloyl propyl trimethyl chloride 4 parts of ammonium, 3 parts of sodium formate, 0.6 parts of sodium hydroxide, 0.04 parts of ammonium persulfate, 80: 4.5 parts of Span, 20: 0.25 parts of Span, 40 parts of water, 24 parts of white oil.

[0092] It is prepared by the following steps: under the condition of normal temperature and 25°C, the above-mentioned parts by weight of water, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, and methacrylamido trimethyl are sequentially added to the reaction kettle. Base ammonium chloride, sodium formate, sodium hydroxide, and Span 20 are mixed to prepare an aqueous phase,

[0093] And mixing white oil and Span 80 to prepare an oil phase;

[0094] Fully mix the water phase and the oil phase to obtain an emulsion base liquid; place the emulsion in a reactor, add an initiator aft...

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Abstract

The invention provides a filtrate loss reducer for water-based drilling fluid and a preparation method of the filtrate loss reducer, and belongs to the technical field of drilling fluid. The filtrateloss reducer is in the form of water-in-oil emulsion, and is good in dispersity and convenient to use on site. The filtrate loss reducer can balance contradiction between the filtration loss reducingperformance and the rheological property, not only has good filtration loss reducing capability, but also can assist in adjusting the rheological property of the drilling fluid. The filtrate loss reducer comprises the following components: acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, methacryloyl propyl trimethyl ammonium chloride, sodium formate, sodium hydroxide, ammonium persulfate, span 80, span 20, water and white oil. The filtrate loss reducer is added into the water-based drilling fluid in a drilling process to control filtration loss.

Description

Technical field [0001] The invention relates to the technical field of drilling fluids, in particular to a filtrate reducer for water-based drilling fluids and a preparation method thereof. Background technique [0002] During the drilling process, due to the pressure difference, the water in the drilling fluid will inevitably be filtered to the formation through the borehole 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 on the well wall. Because the filter cake borehole wall is much denser than the original borehole wall, it prevents further loss of drilling fluid on the one hand and protects the borehole wall on the other hand. However, the fluid loss of the drilling fluid (the fluid loss refers to the volume of the filtrate that passes through the filter medium and the formed mud cake when the drilling fluid is subjected to a fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C08F220/56C08F220/58C08F220/60
CPCC09K8/24C08F220/56
Inventor 黄凯王义虎贾永红尤维志毛俊刘鹏甘家波杜庆福哈丽丹
Owner BEIJING SHIDABOCHENG TECH
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