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Ultrahigh-temperature drilling fluid filtrate reducer and its preparation method

A technology of fluid loss reducer and drilling fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of loss of high temperature and high pressure fluid loss, increase of liquid phase viscosity, and deterioration of rheology, etc., and achieve good Good rheology and high temperature stability

Active Publication Date: 2015-01-21
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the NaCl content in the drilling fluid exceeds 4%, using SMP as a high-temperature and high-pressure fluid loss reducer loses the effect of effectively controlling the high-temperature and high-pressure fluid loss, and the rheology becomes poor. The high-temperature and high-pressure fluid loss is controlled in a lower range. If only high-temperature-resistant polymer fluid loss additives are used, it must be achieved by increasing its dosage. However, with the increase of polymer dosage, the liquid phase viscosity of the system increases. , which brings unfavorable factors to the rheological control of high-density drilling fluid

Method used

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  • Ultrahigh-temperature drilling fluid filtrate reducer and its preparation method
  • Ultrahigh-temperature drilling fluid filtrate reducer and its preparation method
  • Ultrahigh-temperature drilling fluid filtrate reducer and its preparation method

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Effect test

Embodiment 1

[0030] The sulfomethylphenolic resin was first prepared according to literature methods. 50 parts of water, 160 parts of formaldehyde, 100 parts of phenol, 35 parts of sodium metabisulfite and 42 parts of sodium sulfite were added to the reactor, and after reacting for a certain time at a certain temperature, 335 parts (including 50 parts added first) were added in batches. , to control the degree of reaction.

[0031] Add 625 parts of 35% sulfomethylated phenolic resin prepared in step (1) into the autoclave, start stirring, then add 60 parts of water, 7 parts of formaldehyde, 22.5 parts of cyclohexanone, 60 parts of water, 7 parts of formaldehyde, 22.5 parts of cyclohexanone, 32.5 parts of 3-hydroxybutyraldehyde, 18 parts of sodium metabisulfite, 20.5 parts of sodium sulfite, continue to stir for 30 minutes after the raw materials are added, seal the reaction kettle, heat up, and keep the temperature at 90 ° C for 0.5 hours; after the reaction time is reached, continue to he...

Embodiment 2

[0033] The sulfomethylphenolic resin was first prepared according to literature methods. 50 parts of water, 162 parts of formaldehyde, 100 parts of phenol, 34.5 parts of sodium metabisulfite and 47.5 parts of sodium sulfite were added to the reactor, and after reacting for a certain time at a certain temperature, 335 parts (including 50 parts added first) were added in batches. , to control the degree of reaction.

[0034] Add 625 parts of 35% sulfomethylated phenolic resin prepared in step (1) into the autoclave, start stirring, and then add 75 parts of water, 2.5 parts of formaldehyde, 18 parts of methyl ethyl ketone, 36 parts of methyl ethyl ketone, and 36 parts of water to the reaction kettle according to the proportions. 4-Hydroxybutyraldehyde, 22 parts of potassium metabisulfite, 25.5 parts of potassium sulfite, continue to stir for 40min after adding the raw materials, seal the reaction kettle, heat up, at 90 ℃, heat preservation reaction for 0.5 hours; The reaction wa...

Embodiment 3

[0036] The sulfomethylphenolic resin was first prepared according to literature methods. 50 parts of water, 160 parts of formaldehyde, 100 parts of phenol, 35 parts of sodium metabisulfite and 42 parts of sodium sulfite were added to the reactor, and after reacting for a certain time at a certain temperature, 335 parts (including 50 parts added first) were added in batches. , to control the degree of reaction.

[0037] Add 625 parts of the 35% sulfomethylated phenolic resin prepared in step (1) into the autoclave, start stirring, then add 75 parts of water, 7 parts of formaldehyde, 27 parts of cyclohexanone, 75 parts of water, 7 parts of formaldehyde, 27 parts of cyclohexanone, 32.5 parts of 5-hydroxyvaleraldehyde, 22 parts of ammonium metabisulfite, 13 parts of ammonium sulfite, continue to stir for 50min after the raw materials are added, seal the reaction kettle, heat up, and keep the temperature at 70 ℃ for 1 hour; continue to heat up after the reaction time is reached , ...

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Abstract

The invention relates to an ultrahigh-temperature drilling fluid filtrate reducer and its preparation method, especially relates to an ultrahigh-temperature brine drilling fluid high-temperature high-pressure filtrate reducer and its preparation method, and belongs to the technical field of synthesis of water-soluble polymer materials. The filtrate reducer is obtained through a reaction of sulfomethylated phenolic resin, formaldehyde, hydroxyalkyl aldehyde, alicyclic ketone or aliphatic ketone, sulfite and pyrosulfite at a high temperature under a high pressure for a certain time. The filtrate reducer can effectively control the high temperature and high pressure filtration loss and the rheological property of the brine drilling fluid, has good compatibility with LP527, MP488 and SMC, has good high temperature stability, has no thickening phenomenon after ageing at 220DEG C, can effectively control the high temperature and high pressure filtration loss of the drilling fluid less than 16 ml, and still has good rheological property under a density of 2.32 g / cm<3>. The preparation process is easy to control, and the above obtained product can satisfy the need of the control of the high temperature and high pressure filtration loss of the 220DEG C ultrahigh-temperature drilling fluid.

Description

Technical field: [0001] The invention relates to an ultra-high temperature drilling fluid fluid loss reducer and a preparation method thereof, in particular to a high temperature and high pressure fluid loss reducer for ultra-high temperature brine drilling fluid and a preparation method thereof, belonging to the technical field of synthesis and preparation of water-soluble polymer materials, more precisely Said to belong to the technical field of oilfield chemical preparation. technical background: [0002] With the intensification of deep oil and gas exploration and development, the strata encountered by drilling are becoming more and more complex. Generally speaking, the deeper the well, the higher the downhole pressure and temperature, and the greater the difficulty in drilling and completion. High temperature and high pressure formations exist in many parts of the world. For example, in the developed areas such as the United States and the North Sea, many reservoir pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08G8/28
CPCC08G8/28C09K8/035
Inventor 王中华王旭
Owner CHINA PETROCHEMICAL CORP
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