Capsule lubricant for drilling fluid, preparation method thereof, water-based drilling fluid and application

A technology of encapsulated lubricants and water-based drilling fluids, applied in chemical instruments and methods, drilling compositions, etc., can solve problems affecting rheology, low effective concentration, and large consumption

Active Publication Date: 2020-10-27
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect that the lubricant in the prior art cannot perform "targeted lubrication" on high friction and torque parts, and the traditional drilling fluid lubricant h

Method used

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  • Capsule lubricant for drilling fluid, preparation method thereof, water-based drilling fluid and application
  • Capsule lubricant for drilling fluid, preparation method thereof, water-based drilling fluid and application
  • Capsule lubricant for drilling fluid, preparation method thereof, water-based drilling fluid and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] This example is to illustrate the encapsulated lubricant prepared by the phase separation method of the present invention.

[0073] (1) Prepare the wall component solution: prepare an acetic acid solution with a mass concentration of 1%, measure 200mL of the acetic acid solution and place it in a beaker, add 5.00g of chitosan, and stir it at a high speed of 3000r / min for 20min at a temperature of 50°C. Set for 1h, a clear and transparent wall component solution was obtained.

[0074] (2) Preparation of oil-in-water emulsion: Add 1.4 g of compound emulsifier (sorbitan monooleate (Span80) and polyoxyethylene octylphenol ether-10 (OP-10) to 200 mL of deionized water, weight The ratio is 1:1.5), and the HLB of the compound emulsifier is 13. Under stirring conditions, add 7.00g of lubricating oil base oil (palm oil) dropwise to the beaker; the temperature is 50°C, and the mixture is stirred at 3000r / min for 10min to obtain oil-in-water emulsion.

[0075] (3) The temperatur...

Embodiment 2-5

[0091] Prepare encapsulated lubricant according to the same conditions as in Example 1, the difference is: each component, component dosage and conditions are different, specifically as shown in Table 1, wherein, for the components not listed in Table 1 , component consumption and conditions are then considered to be the same as in Example 1.

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Abstract

The invention relates to the technical field of lubricant preparation, and discloses a capsule lubricant for drilling fluid, a preparation method thereof, water-based drilling fluid and application. The capsule lubricant comprises a core component and a wall component coating the outer surface of the core component, and on the basis of the total weight of the capsule lubricant, the content of thecore component is larger than or equal to 75 wt%, and the content of the wall component is smaller than or equal to 25 wt%. The capsule lubricant is prepared by the following method: in the presence of a curing agent, carrying out phase separation reaction on an oil-in-water emulsion and a wall component solution, and carrying out spray drying treatment on a reaction product; the oil-in-water emulsion includes a lubricant base oil, a composite emulsifier, and water, and the wall component solution includes a polysaccharide polymer and an acid. When the addition amount of the capsule lubricantis 1%, the reduction rate of the lubrication coefficient is basically 70% or above.

Description

technical field [0001] The invention relates to the technical field of lubricant preparation, in particular to a capsule lubricant for drilling fluid, a preparation method thereof, a water-based drilling fluid and its application. Background technique [0002] At present, high friction and high torque in the drilling of extended-reach wells and horizontal wells are the key factors restricting their horizontal displacement extension. The friction between the drilling tool and the drilling fluid, the friction between the drilling tool and the well wall (mud cake or formation rock), and the cutting of the broken rock by the bit are the main sources of torque and friction during the drilling process. High torque and high friction have brought many problems to drilling operations, such as downhole accidents such as pipe sticking, reduced ROP, and increased drilling costs. Drilling fluid lubricants are added to the drilling fluid during on-site construction to reduce drilling tor...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/20C09K8/03
CPCC09K8/206C09K8/24C09K8/03
Inventor 刘均一陈二丁李光泉李文博高凯李婧靓宿振国赵红香李秀灵夏晔
Owner 中石化石油工程技术服务有限公司
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