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Drilling fluid and use of imidazole ionic liquid therein

A technology of ionic liquids and drilling fluids, applied in the field of drilling fluids, can solve problems such as difficult adjustment and control, failure of drilling operations, and reduced ability to carry cuttings

Active Publication Date: 2015-11-11
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature gradually increases, the drilling fluid will undergo high-temperature thickening, thickening and solidification, the clay will undergo high-temperature dispersion, high-temperature coalescence and high-temperature passivation, and the treatment agent will undergo high-temperature degradation and high-temperature crosslinking. The stability of the liquid colloid is broken, and the rheology changes. This change is an irreversible change, which is difficult to adjust and control, and has adverse effects on drilling, such as the decline in the ability to carry cuttings and the decrease in mechanical speed. In severe cases, it will make drilling operations impossible. Work properly

Method used

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  • Drilling fluid and use of imidazole ionic liquid therein
  • Drilling fluid and use of imidazole ionic liquid therein
  • Drilling fluid and use of imidazole ionic liquid therein

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Drilling fluids containing ionic liquids comprising the following components:

[0022] 1-Butyl-3-methylimidazolium tetrafluoroborate 0.02% by weight

[0023] Partially hydrolyzed polyacrylamide 0.2% by weight

[0024] Sodium bentonite 4% by weight

[0025] The remainder of the aqueous solution.

[0026] First configure 10L drilling fluid with 4% bentonite, and pre-hydrate for 24 hours; at the same time, make the polymer into a glue solution with a certain concentration of 2%, and add the pre-hydrated drilling fluid according to the above ratio; measure the normal temperature (that is, before aging) Rheology and rheology after rolling at 160°C for 16 hours (that is, after aging); add the ionic liquid according to the above ratio, and measure the rheology at room temperature (that is, before aging) and the rheology after rolling at 160°C for 16 hours (that is, after aging). For comparison, see Table 1 for specific data.

Embodiment 2

[0028] The composition and preparation method of the drilling fluid are the same as in Example 1, except that the amount of 1-butyl-3-methylimidazolium tetrafluoroborate is changed to 0.05% by weight.

Embodiment 3

[0030] The composition and preparation method of the drilling fluid are the same as in Example 1, except that the amount of 1-butyl-3-methylimidazolium tetrafluoroborate is changed to 0.08% by weight.

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Abstract

The invention relates to drilling fluid containing 0.02-0.08% by weight of ionic liquid 1-alkyl-3-methylimidazol tetrafluoroborate, 0.1-0.5% by weight of polymers, 1-6% by weight of bentonite and the balance of aqueous solution, wherein the polymers are selected from one or more of partially hydrolyzed polyacrylamide, high-viscosity sodium carboxymethyl cellulose and xanthan gum, and the carbon atom number of alkyl is 4-8. The drilling fluid has an obviously-improved system high-temperature rheological property.

Description

technical field [0001] The invention relates to a drilling fluid, in particular, the invention relates to a drilling fluid whose high-temperature rheology of the system is obviously improved. Background technique [0002] One of the key technologies for deep resource exploration is the supporting high temperature resistant drilling fluid technology. High temperature resistant drilling fluid plays an increasingly prominent role in ensuring safe drilling, stabilizing borehole walls, increasing ROP, and protecting reservoirs. Therefore, the research on anti-high temperature drilling fluid technology is a research hotspot in this field. [0003] Judging from the deep drilling practice at home and abroad in recent decades, the commonly used drilling fluid systems for deep drilling include water-based drilling fluid and oil-based drilling fluid. Compared with water-based drilling fluid, the oil-based drilling fluid system has the advantages of good thermal stability, good water ...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/22
CPCC09K8/22C09K8/24
Inventor 罗志华裴晶晶宋兵强
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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