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Environmentally-friendly strong sealing oil-based drilling fluid

An oil-based drilling fluid, an environment-friendly technology, applied in the field of oil-based drilling fluid, can solve problems such as poor plugging performance, achieve good plugging effect, small impact of shear force, and protect reservoirs

Active Publication Date: 2015-05-13
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: ① There is no research work on the wellbore stability in shale formations, and the plugging performance is not strong; ② People have higher requirements for environmental protection, and new types of drilling fluids that are more environmentally friendly are needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] at 10m 3 Add 2% WO-1, 1% S-80, and 3% dodecylbenzenesulfonate to the refined white oil according to the volume-to-weight ratio of the white oil, and stir for 3 hours until uniform. Then slowly add 2 m 3 Calcium chloride aqueous solution, adding speed is 4m 3 / h, and stirred for 8h after adding. Then add 5% organic soil, 4% plugging agent (nano-scale silicon dioxide and 500 mesh calcium carbonate, 800 mesh calcium carbonate weight percentage is 5:2:2), 2% fluid loss reducer (oil Soluble resin and emulsified asphalt are prepared in a ratio of 2:1), 3% calcium oxide and other treatment agents, and each addition is stirred for 3 hours. Add 110% ultrafine ilmenite powder through a shear pump and stir for 5 hours. At this time, the density of the prepared environment-friendly strong plugging oil-based drilling fluid is 1.52g / cm 3 , the electrical stability ES is 950V, and the API medium pressure water loss is less than 3mL.

Embodiment 2

[0015] at 10m 3 In refined white oil, add 1% WO-1, 2% S-80, and 2% dodecylbenzenesulfonate according to the volume-to-weight ratio of the white oil, and stir for 3 hours until uniform. Then slowly add 1 m 3 Calcium chloride saturated aqueous solution, adding speed is 4m 3 / h, and stirred for 8h after adding. Then add 3% organic soil, 2% plugging agent (nano-scale silicon dioxide and 500 mesh calcium carbonate, 800 mesh calcium carbonate weight percentage is 5:2:2), 4% fluid loss reducer (oil Soluble resin and emulsified asphalt are prepared at a ratio of 2:1), 2% calcium oxide and other treatment agents, and each addition is stirred for 3 hours. Add 110% ultrafine ilmenite powder through a shear pump and stir for 5 hours. At this time, the density of the prepared environment-friendly strong plugging oil-based drilling fluid is 1.51g / cm 3 , the electrical stability ES is 935V, and the API medium pressure water loss is less than 3mL.

Embodiment 3

[0017] at 10m 3 In refined grade white oil, add 2% WO-1, 1% S-80, 2% wetting agent (dodecylbenzenesulfonate and calcium naphthenate by weight percentage 2 :1 preparation), stirring for 3h, until the stirring is uniform. Then slowly add 2 m 3 Calcium chloride saturated aqueous solution, adding speed is 4m 3 / h, and stirred for 8h after adding. Then add 5% organic soil, 4% plugging agent (nano-scale silica and 500 mesh calcium carbonate, 800 mesh calcium carbonate weight percentage is 3:1:1), 2% emulsified asphalt, 3% oxidation Calcium and other treatment agents, add each one and stir for 3 hours. Add 110% ultrafine ilmenite powder through a shear pump and stir for 5 hours. At this time, the density of the prepared environment-friendly strong plugging oil-based drilling fluid is 1.53g / cm 3 , the electrical stability ES is 968V, and the API medium pressure water loss is less than 3mL.

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Abstract

The invention provides an environmentally-friendly strong sealing oil-based drilling fluid. The environmentally-friendly strong sealing oil-based drilling fluid is based on a base liquid, and comprises 10-20wt% of an aqueous solution of calcium chloride, 1-2wt% of a main emulsifier, 1-2wt% of an auxiliary emulsifier, 2-3wt% of a wetting agent, 3-5wt% of organic soil, 2-3wt% of calcium oxide, 2-4wt% of a sealing agent, 2-4wt% of a filtrate reducer, and 0-150wt% of a weighting material. The drilling fluid can effectively seal shale formation, improves the stability of a borehole wall, and reduces the pollution to environment; and the novel weighting material used in the invention has small influences on the rheological performance of the oil-based drilling fluid and reduces damages to reservoirs.

Description

technical field [0001] The invention relates to an oil-based drilling fluid, in particular to an environment-friendly strong plugging oil-based drilling fluid. Background technique [0002] Compared with water-based drilling fluids, oil-based drilling fluids have obvious advantages in stable lubrication and anti-sticking of wellbore walls, inhibition of shale hydration expansion and formation slurrying, and rapid drilling. It is an important method for highly deviated directional wells, horizontal wells, various complex well sections and reservoir protection. With the exploration and development of unconventional oil and gas resources, the wellbore stability in shale formations has become the key to the success of drilling. The mud shale is easily dispersed when it meets water, causing the well wall to collapse, and it is necessary to strongly suppress and seal the formation. Therefore, domestic drilling fluid workers have done a lot of research work on improving the plug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32C09K8/03
CPCC09K8/36C09K2208/10
Inventor 刘振东李公让乔军李海滨侯业贵高杨周守菊刘从军
Owner CHINA PETROCHEMICAL CORP
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