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Water-in-oil-type biodiesel-based drilling fluid and preparation method thereof

A technology of biodiesel and water-in-oil type, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of no technical report of water-in-oil type biodiesel-based drilling fluid and the impact of drilling fluid filter cake filtration reduction In order to avoid problems such as loss of performance and poor viscosification effect of organic soil, it can achieve the effect of strong shale inhibition, excellent operation performance and low cost

Active Publication Date: 2013-09-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the full oil-based drilling fluid system has some excellent performances, it will encounter some problems in practical application: first, due to the large amount of biodiesel in the full oil-based drilling fluid system, its preparation cost is high; In the system, the viscosifying effect of organic soil is not good. In order to ensure the viscosity of the system, a large amount of organic soil must be added, which increases the preparation cost. Fourth, when drilling in the formation with full oil-based drilling fluid, formation water often invades the drilling fluid system, thereby causing a sudden change in the operating performance of the system (such as obvious thickening and sudden increase in fluid loss) ), at this time, the water must be removed through specific separation equipment, which increases the difficulty of on-site operations
After investigation, no technical report on water-in-oil biodiesel-based drilling fluid was found

Method used

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  • Water-in-oil-type biodiesel-based drilling fluid and preparation method thereof
  • Water-in-oil-type biodiesel-based drilling fluid and preparation method thereof
  • Water-in-oil-type biodiesel-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The specific formula of the water-in-oil type biodiesel base drilling fluid of the present embodiment is:

[0064] Biodiesel (fatty acid methyl ester) volume: 25% calcium chloride brine volume = 80:20, in addition to containing 3.5% primary emulsifier + 2% secondary emulsifier (alkylbenzene sulfonate) + 3% calcium oxide + 4% Organic bentonite + 5% wetting agent (including 4% octylphenol ethoxylate and 1% lecithin PC50) + 4% fluid loss control agent (all lignite).

[0065] The biodiesel base drilling fluid of the present embodiment is prepared according to the following method:

[0066] ① Under high-speed stirring, slowly add the required primary emulsifier, secondary emulsifier, and wetting agent to 80 parts of biodiesel in sequence. After each treatment agent is added, stir for 30 minutes before adding the next one until these components are fully dispersed in the biodiesel.

[0067] ② Prepare a calcium chloride solution with a mass fraction of 25% in water. Dissolv...

Embodiment 2

[0084] The water-in-oil biodiesel-based drilling fluid in this example is based on the formula in Example 1, which is aggravated. The specific formula is:

[0085] Biodiesel (fatty acid ethyl ester) volume: 25% calcium chloride brine volume = 80:20, in addition to containing 3.5% primary emulsifier + 2% secondary emulsifier (alkylbenzene sulfonate: petroleum sulfonate = 8:2 ) + 3% calcium oxide + 4% organic bentonite + 5% wetting agent (formed from 4% octylphenol polyoxyethylene ether and 1% lecithin PC50) + 4% fluid loss control agent (all lignite) +80% Barite Dust. The preparation steps are basically the same as in Example 1. The weighting step is to add the weighting material to the drilling fluid system slowly while stirring after fully mixing other components of the drilling fluid until the density of the system reaches the requirement, and then seal the prepared biodiesel-based drilling fluid and let it stand More than 24 hours.

[0086] The basic properties of the o...

Embodiment 3

[0091] This embodiment changed the calcium chloride mass fraction in the calcium chloride brine phase on the basis of the aforementioned embodiment 1 (the remainder of the formula is constant), to illustrate that the drilling fluid can be regulated to a certain extent by changing this parameter. Shale inhibition. The specific formula is: biodiesel volume: 35% calcium chloride brine volume = 80:20, in addition to containing 3.5% primary emulsifier + 2% secondary emulsifier + 3% calcium oxide + 4% organic bentonite + 5% wetting agent ( Consists of 4% octylphenol ethoxylate and 1% lecithin PC50) + 4% fluid loss control agent (all lignite). The preparation steps are basically the same as in Example 1. The basic performance of the system is shown in Table 6:

[0092] Table 6 Example 3 Basic Properties of Drilling Fluid System

[0093]

[0094]

[0095] It can be seen from Table 6 that by increasing the concentration of calcium chloride in the brine phase, the basic perform...

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Abstract

The invention discloses a water-in-oil-type biodiesel-based drilling fluid and a preparation method thereof. The drilling fluid comprises the following components in parts by volume: 70 to 90 parts of biodiesel prepared by taking waste oils as a raw material, and 10 to 30 parts of calcium chloride aqueous solution. Based on the total volume of the biodiesel and the calcium chloride aqueous solution, the drilling fluid further comprises the following components in mass-volume ratio: 2% to 6% of calcium oxide, 1% to 6% of organic soil, 2% to 8% of emulsifier, 2% to 8% of wetting agent, 2% to 6% of filtrate reducer and 0% to 200% of weighting material. The drilling fluid disclosed by the invention has the characteristics of good operating performance, low cost, strong collapse-resisting inhibiting performance, excellent lubricating performance and excellent biological degradability.

Description

technical field [0001] The present invention relates to a water-in-oil biodiesel-based drilling fluid and a preparation method thereof. The water-in-oil biodiesel-based drilling fluid is mainly used in easily collapsed well sections, horizontal wells, directional wells, and extended-reach wells, or The utility model is used in drilling operations for drilling reservoirs, and belongs to the technical field of oil and gas drilling fluids. Background technique [0002] With the rapid development of oil drilling technology at home and abroad, the exploration field continues to expand, and the formation conditions encountered are becoming more and more complex. Water-based drilling fluids cannot meet the performance requirements for complex downhole conditions. Specifically, it is easy to cause hydration and collapse of the well wall, high frictional resistance, easy formation of gas hydrate and blockage, and low ROP. Therefore, people often use oil-based drilling fluids when dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/36
Inventor 赵雄虎李外李玉飞季一辉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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