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High temperature high salinity fluid loss agent for drilling fluid and preparation method thereof

A fluid loss reducer, high-temperature and high-salt technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the difficult control of the rheology of the drilling fluid system, the increase in the viscosity of the drilling fluid, and the inability to meet the high-temperature and high-pressure fluid loss. and rheological control, to achieve the effect of convenient application, good fluid loss reduction characteristics, and easy dispersion

Active Publication Date: 2013-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The relative molecular weight of the polymer fluid loss reducer in the prior art is high. In order to play a role in reducing fluid loss under the conditions of brine drilling fluid and high temperature, it is necessary to increase the dosage, and the adverse effect brought about by this may make the viscosity of the drilling fluid Increase, or the rheology of the drilling fluid system is not easy to control due to high temperature thickening or degradation of the polymer
Existing high-temperature and high-pressure fluid loss reducers such as sulfonated phenolic resin (SMP) can basically meet the needs of drilling within 200 °C, but cannot meet the requirements of high-temperature and high-pressure fluid loss and rheological control of brine and saturated brine drilling fluids under ultra-high temperature conditions. need

Method used

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  • High temperature high salinity fluid loss agent for drilling fluid and preparation method thereof
  • High temperature high salinity fluid loss agent for drilling fluid and preparation method thereof
  • High temperature high salinity fluid loss agent for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add water to the reaction flask, mix the water-soluble monomer acrylamide 50g (0.70mol), acrylic acid 10g (0.14mol), (2-acryloxy)butyl sulfonate 70g (0.28mol) and molecular weight under stirring. The regulator, t-dodecyl mercaptan, 0.7g uniformly dissolved in water, adjusted the pH of the polymerization system to 9.5 with 40% potassium hydroxide aqueous solution, and added the initiator aqueous solution (1.0g potassium persulfate and 1.0g sodium sulfite respectively) In 5ml water), the reaction was initiated at 34°C, and the polymerization reaction was completed in 22 minutes to obtain an elastic jelly. After granulation, drying, and pulverization, a high temperature and high salt fluid loss reducer PFL-H 1 was obtained, with a relative molecular mass of 680,000.

Embodiment 2

[0047] Add water to the reaction flask, mix the water-soluble monomer acrylamide 50g (0.70mol), acrylic acid 15g (0.21mol), (2-acryloxy)butyl sodium sulfonate 100g (0.43mol) and molecular weight under stirring. The regulator, t-dodecyl mercaptan, 0.5g was uniformly dissolved in water, the pH of the polymerization system was adjusted to 10.5 with 40% sodium hydroxide aqueous solution, and the initiator aqueous solution (1.0g potassium persulfate and 1.0g sodium sulfite were respectively dissolved in In 5ml water), the reaction was initiated at 36°C, and the polymerization reaction was completed in 14 minutes to obtain an elastic jelly. After granulation, drying, and pulverization, a high temperature and high salt fluid loss reducer PFL-H 2 was obtained, with a relative molecular mass of 570,000.

Embodiment 3

[0049] Add water to the reaction flask, mix the water-soluble monomer acrylamide 50g (0.70mol), acrylic acid 10g (0.14mol), and (2-methacryloyloxy)butyl sodium sulfonate 70g (0.28mol) under stirring. And molecular weight regulator t-dodecyl mercaptan 0.5g uniformly dissolved in water, adjust the pH of the polymerization system to 9.5 with 40% sodium hydroxide aqueous solution, add the initiator aqueous solution (1.0g potassium persulfate, 1.0g sodium sulfite respectively Dissolved in 5ml water), the reaction was initiated at 35°C, and the polymerization reaction was completed in 17 minutes to obtain an elastic jelly. After granulation, drying, and pulverization, a high temperature and high salt fluid loss reducer PFL-H 3 was obtained. The relative molecular weight was 630,000.

[0050] figure 1 It is the infrared spectrum of the high temperature and high salt fluid loss control agent PFL-H 3 prepared in Example 3

[0051] figure 1 Middle, 3424.6cm -1 It is the characteristic absor...

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Abstract

The invention provides a high temperature high salinity fluid loss agent for drilling fluid and a preparation method thereof. The fluid loss agent provided in the invention is prepared through copolymerization of acrylamide, acrylic acid and alkyl sulfonate containing acyloxy groups, is a random copolymer and has a relative molecular mass of 500 to 700 thousand, wherein, the mol ratio of the component acrylamide to the component acrylic acid to the component alkyl sulfonate containing acyloxy groups is 2-8: 1: 0.5-5.0. The high temperature high salinity fluid loss agent provided in the invention has a good fluid loss characteristic under the conditions of high temperature and high salinity, can rapidly dissolve in an aqueous solution and is very convenient to use.

Description

Technical field [0001] The present invention relates to a fluid loss control agent for drilling fluid used in petroleum drilling construction, more specifically, it is a polymer type fluid loss control agent for drilling fluid with high temperature and high salt resistance and a preparation method thereof. Drilling construction in salt formations. Background technique [0002] Filtrate reducer is an important drilling fluid treatment agent in the oil drilling process. By forming a low-permeability, flexible, thin and dense filter cake on the well wall, the fluid loss of the drilling fluid is reduced as much as possible, and the harmful liquid is reduced to the formation. Filtration to ensure the smooth progress of drilling. [0003] With the increase in world energy demand and the development of drilling technology, the strata drilled are becoming increasingly complex, and the number of special wells, ultra-deep wells and complex wells has increased, putting forward higher and hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/06C08F220/38
Inventor 杨小华李家芬王琳苏长明钱晓琳王显光李胜任立伟
Owner CHINA PETROLEUM & CHEM CORP