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Plugging material and drilling fluid additive and use method thereof

A technology of plugging materials and additives, applied in the field of petroleum drilling fluids, can solve the problems of increasing the risk of shale well wall collapse, insufficient sealing capacity of micro-pores and micro-cracks of rocks, etc., and achieve the effect of improving emulsification stability

Inactive Publication Date: 2015-06-17
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings or shortcomings of these technologies are: the ability to plug micro-pores and micro-cracks in rocks is not enough, resulting in the intrusion of water into mud shale to a certain extent when drilling in long mud shale well sections, thus increasing the Risk of Shale Hole Collapse

Method used

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  • Plugging material and drilling fluid additive and use method thereof
  • Plugging material and drilling fluid additive and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The plugging material used in this embodiment includes silica with a particle size of 20 nm and sepiolite with a particle size of 200 mesh, wherein the weight ratio of the silica to sepiolite is 4:1. The oil-based drilling fluid additive in this embodiment includes 1 mass part of plugging material, 0.5 mass part of emulsifier Span 80, 0.5 mass part of wetting agent dodecylbenzenesulfonate and 0.1 mass part of calcium chloride aqueous solution.

[0028] The method of using the described oil-based drilling fluid additive of the present embodiment to improve the plugging performance of drilling fluid includes:

[0029] In every 100ml of oil-based drilling fluid, add 1 g of the plugging material of this embodiment, which is uniformly mixed with silica with a particle size of 20 nanometers and sepiolite with a particle size of 200 mesh in a weight ratio of 4:1. material, and then sequentially add 0.5g Span 80, 0.5g dodecylbenzenesulfonate and 0.1g calcium chloride aqueous so...

Embodiment 2

[0031] The plugging material used in this embodiment includes silica with a particle size of 500 nm and sepiolite with a particle size of 500 mesh, wherein the weight ratio of the silica to sepiolite is 4:1. The oil-based drilling fluid additive in this embodiment includes 3 parts by mass of plugging material, 2 parts by mass of emulsifier Span 80, 0.5 part by mass of wetting agent dodecylbenzenesulfonate and 1 part by mass of calcium chloride aqueous solution.

[0032] Add 3g of the plugging material of this embodiment into every 100ml of oil-based drilling fluid, and then add 2g of Span 80, 2g of dodecylbenzenesulfonate and 1g of calcium chloride aqueous solution with a concentration of 20% by weight in sequence. When the calcium chloride aqueous solution is added to the oil-based drilling fluid, use a fine atomization nozzle to atomize the calcium chloride aqueous solution into fine droplets and then spray it into the oil-based drilling fluid, and use an ultrasonic solid par...

Embodiment 3

[0034] The plugging material used in this embodiment includes silica with a particle size of 40 nm and sepiolite with a particle size of 300 mesh, wherein the weight ratio of the silica to sepiolite is 5:2. The oil-based drilling fluid additive in this embodiment includes 2 parts by mass of plugging material, 1 part by mass of emulsifier Span 80, 1 part by mass of wetting agent dodecylbenzenesulfonate and 0.5 part by mass of calcium chloride aqueous solution.

[0035] Add 2g of the plugging material of this embodiment into every 100ml of oil-based drilling fluid, then add 1g of Span 80, 1g of dodecylbenzenesulfonate and 0.5g of 20% calcium chloride aqueous solution in sequence, and use The ultrasonic solid particle dispersing and emulsifying mixer stirs the oil-based drilling fluid evenly. According to the method of industry standard SY / T5621-93, the high-temperature and high-pressure fluid loss of the oil-based drilling fluid in this example was measured to be 4.2ml.

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Abstract

The invention provides a plugging material, the plugging material comprises nano silica and sepiolite; and the weight ratio of nano silica to sepiolite is 4-5:1-2. The invention also provides an oil base drilling fluid additive containing the plugging material, the oil base drilling fluid additive comprises 1-3 by mass parts of the plugging material, 0.5-2 by mass parts of an emulsifier, 0.5-2 by mass parts of a wetting agent and 0.1-1 by mass part of a calcium chloride aqueous solution. The invention also provides a use method of the oil base drilling fluid additive for improving the plugging performance of a drilling fluid, and the method is as follows: the oil base drilling fluid additive is proportionally added with the plugging material, the emulsifier, the wetting agent and the calcium chloride aqueous solution, and stirring and emulsifying are performed, so that the plugging property of the drilling fluid is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling fluid, in particular to a plugging material for improving the plugging performance of oil-based drilling fluid, a drilling fluid additive and a use method thereof. Background technique [0002] Oil-based drilling fluid, also known as oil-based mud, is basically composed of oil, water, organic clay and oil-soluble chemical treatment agent. Oil-based drilling fluid has strong inhibitory properties, high temperature resistance, and salt and calcium erosion resistance. It is beneficial to wellbore stability, good lubricity, and less damage to oil and gas layers. It is mostly used in water-sensitive formations. In shale oil reservoirs, the shale in the formation is prone to hydration and dispersion when it encounters water, causing the well wall to collapse. Therefore, oil-based drilling fluids are often used for exploration and development at home and abroad. The plugging performance of oi...

Claims

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Application Information

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IPC IPC(8): C09K8/32C09K8/03
CPCC09K8/32C09K2208/10
Inventor 李作会刘振东李公让周守菊侯业贵武学芹高杨张妍
Owner CHINA PETROCHEMICAL CORP
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