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Micro-nano plugging lubricant for drilling fluid and preparation method thereof

A micro-nano and drilling fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low application value, large size, only improvement, and decreased lubricity of drilling fluid, so as to improve the quality of mud cake , avoid mutual interference, improve the effect of lubricity

Active Publication Date: 2021-03-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After repeated tests in our laboratory, ultra-fine calcium carbonate is an inert material, and it is an abrasive of sandstone. Adding drilling fluid has a great impact on the extreme pressure lubricity of the product. It only improves the plugging performance, but makes the drilling fluid lubricating. performance decline, application value is not high

Method used

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  • Micro-nano plugging lubricant for drilling fluid and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing a micro-nano plugging lubricant for drilling fluid, comprising the following steps:

[0047] (1) Weigh 30 parts by weight of paraffin and 50 parts by weight of white oil into a three-necked flask, stir at a speed of 300 rpm, heat up to 75°C, add 30 parts by weight of a compound emulsifier after melting, and stir for 30 minutes; slowly add 40 parts by weight of 75°C Add 1.0 parts by weight of emulsifying aid to hot water, and continue stirring at 300 rpm for 30 minutes; add 60 parts by weight of hot water at 75°C, stir for 20 minutes, and cool down to 40°C to obtain a nanoemulsion.

[0048] Among them, the emulsifying aid is 1.0mol / L hydrochloric acid solution, and the compound emulsifier is composed of Span 80 and Tween 80 in a weight ratio of 1:1.

[0049] (2) Weigh graphite fine powders of 325 mesh, 800 mesh, 1200 mesh, 2000 mesh and 4000 mesh and mix them evenly according to the weight ratio of 1:1:1:1:1 to obtain composite graphite fine powder...

Embodiment 2

[0052] A method for preparing a micro-nano plugging lubricant for drilling fluid, comprising the following steps:

[0053] (1) Weigh 40 parts by weight of paraffin and 40 parts by weight of white oil into a three-necked flask, stir at a speed of 400 rpm, heat up to 80°C, add 25 parts by weight of a compound emulsifier after melting, and stir for 30 minutes; slowly add 50 parts by weight of 80°C Add 0.75 parts by weight of emulsifying aid to hot water, and continue to stir at 400 rpm for 30 minutes; (3) Add 50 parts by weight of hot water at 80°C, stir for 20 minutes, and cool down to 45°C to obtain a nanoemulsion.

[0054] Among them, the emulsifying aid is 2.0mol / L acetic acid solution, and the compound emulsifier is composed of Span 80 and Tween 80 according to the weight ratio of 1:1.25.

[0055] (2) Weigh graphite fine powders of 325 mesh, 800 mesh, 1200 mesh, 2000 mesh and 4000 mesh and mix them evenly according to the weight ratio of 1:1:1:1:1 to obtain composite graphit...

Embodiment 3

[0058] A method for preparing a micro-nano plugging lubricant for drilling fluid, comprising the following steps:

[0059] (1) Weigh 50 parts by weight of paraffin and 30 parts by weight of white oil into a three-necked flask, stir at a speed of 500 rpm, heat up to 85°C, add 20 parts by weight of a compound emulsifier after melting, and stir for 30 minutes; slowly add 60 parts by weight of 85°C Add 0.5 parts by weight of emulsifying aid to hot water, and continue stirring at 500 rpm for 30 minutes; (3) Add 40 parts by weight of hot water at 85° C., stir for 20 minutes, and cool down to 50° C. to obtain a nanoemulsion.

[0060] Among them, the emulsifying aid is 1.5mol / L sulfuric acid solution, and the compound emulsifier is made of Span 80 and Tween 80 according to the weight ratio of 1:1.5.

[0061] (2) Weigh graphite fine powders of 325 mesh, 800 mesh, 1200 mesh, 2000 mesh and 4000 mesh and mix them evenly according to the weight ratio of 1:1:1:1:1 to obtain composite graphi...

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Abstract

The invention relates to a micro-nano blocking lubricant for a drilling fluid and a preparation method thereof and belongs to the field of oil and gas field drilling and oilfield chemical auxiliary agents. The micro-nano blocking lubricant for the drilling fluid is prepared from the following components in parts by weight: 100-200 parts of a nano emulsion and 100 parts of composite graphite micropowder. The micro-nano blocking lubricant for the drilling fluid also contains a dispersant. The nanoemulsion is prepared from components including paraffin, white oil, a composite emulsifier, a co-emulsifier and water by a phase inversion emulsification method. The micro-nano blocking lubricant for the drilling fluid can resistant the temperature of 150 DEG C, does not have adverse effects to viscosity of the drilling fluid, can reduce the filter loss of the drilling fluid remarkably, improve the quality of mud cakes remarkably, reduce the frictional resistance of a drilling tool and improve the mechanical drilling speed, and can bridge and block micro-cracks of shale quickly by means of a small size effect to prevent solid particles and a filtrate from invading the stratum to achieve a good blocking effect, so that the micro-nano blocking lubricant for the drilling fluid is particularly suitable for blocking fine throats which are 0.05-50[mu]m.

Description

technical field [0001] The invention relates to the fields of oil and gas field drilling and oil field chemical additives, and more particularly relates to a micro-nano plugging lubricant for drilling fluid and a preparation method thereof. Background technique [0002] Drilling fluid refers to the circulating fluid used in the drilling process of oil and gas layers to meet the needs of drilling work with its versatility. Its main functions include carrying cuttings, stabilizing the well wall and balancing formation pressure, cooling and lubricating drill bits, protecting oil and gas layers, etc. etc. Its performance directly affects drilling efficiency, downhole safety and construction cost, and is an important part of drilling operations. [0003] High lubricity is one of the basic properties of drilling fluid. It can reduce the friction between the well wall and drilling tools, reduce the occurrence of stuck pipe accidents, reduce the rotational torque of the drill string...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/035C09K8/467
CPCC09K8/032C09K8/035C09K8/426C09K8/467C09K2208/10C09K2208/28C09K2208/32
Inventor 邱在磊陈红壮朱兵聂育志江维李洁王浩任马鹏
Owner CHINA PETROLEUM & CHEM CORP
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