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Drilling fluid suspending agent, and preparation method and application thereof

A technology for suspending agent and drilling fluid, which is applied in the fields of sulfonate preparation, chemical instruments and methods, drilling compositions, etc. Simple, mild reaction conditions, and the effect of increasing ROP

Inactive Publication Date: 2017-01-04
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the above technology are: 1. The system contains bentonite, which requires pre-hydration of bentonite slurry, which is complicated to prepare and takes a long time to wait; In the case of suspending agent, after the drilling fluid is recycled downhole, the clay will disperse at high temperature, and the viscosity will increase continuously (in severe cases, it will not flow), and the effect of the viscosity reducing agent will become smaller and smaller until it fails
The deeper the well, the higher the temperature, the longer the use time, the heavier the drilling fluid (higher density), the more difficult it is to handle, and the greater the downhole problems, making the drilling fluid unusable and often leading to abnormal drilling; 3. Use bentonite When equal expansive clay is used as a suspending agent, due to its high density, large solid content, and high degree of dispersion of solid particles, it has a great impact on drilling speed and drill bit wear, especially for solid particles smaller than 1 μm. , since bentonite can increase the viscosity of the drilling fluid, the K value increases accordingly, which is not conducive to increasing the drilling speed
[0007] Although the use of starch, cellulose, and propylene polymers can also play a role in suspending and stabilizing the weighted materials, such substances will increase the viscosity of the drilling fluid. Excessive viscosity may increase the equivalent circulation density of the drilling fluid, and the well problems such as unclean eye cleaning, unfavorable drilling cuttings removal, and complex downhole accidents. Moreover, after this kind of material is recycled downhole, it will degrade at high temperature and fail, resulting in a decrease in viscosity and a decrease in suspension stability, which will cause sand settling when the pump is shut down. Barite precipitation under drilling, barite precipitation in the mud tank (pool), serious and even accidents

Method used

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  • Drilling fluid suspending agent, and preparation method and application thereof
  • Drilling fluid suspending agent, and preparation method and application thereof
  • Drilling fluid suspending agent, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Preparation and evaluation of BSS-12

[0033] (1) Synthesis of N﹑N′-(sodium dihexanesulfonate)ethylenediamine

[0034] Put the reaction kettle with agitator and reflux condenser into a water bath, add 500mL ethanol+water mixture (v:v=3:2), add sodium primary amine hexanesulfonate (NH 2 C 6 h 12 SO 3 Na) 10g, stir and heat up to 50-65°C, stir until completely dissolved, slowly add 1,2-dibromoethane (BrCH 2 CH 2 Br) 6g, control the temperature of the water bath at 70-85°C, stir and reflux, and react for 8-12 hours; the intermediate product N﹑N′-(sodium dihexanesulfonate)ethylenediamine is obtained;

[0035] (2) Synthesis of BSS-12

[0036]Bromododecane (BrC 12 h 25 ) 11g, stir until completely dissolved, control the temperature of the water bath at 70-85°C to stir and reflux, and react for 8 hours; after the reaction, a precipitate precipitates out, and after cooling and drying, N﹑N′-(two-dodecane dihexanesulfonate sodium ) Ethylenediamine, the yield is 95%.

[...

Embodiment 2

[0045] Preparation and evaluation of BSS-16

[0046] (1) Synthesis of N﹑N′-(sodium dioctanesulfonate)ethylenediamine

[0047] Put the reaction kettle with agitator and reflux condenser into a water bath, add 500mL ethanol+water mixture (v:v=3:2), add primary amine octanesulfonic acid (NH 2 C 8 h 16 SO 3 Na) 10g, stir and heat up to 55-70°C, stir until completely dissolved, slowly add 1,2-dibromoethane (BrCH 2 CH 2 Br) 5.2g, control the temperature of the water bath at 85-95°C, stir and reflux, and react for 10-14 hours; the intermediate product N﹑N′-(sodium dioctanesulfonate)ethylenediamine is obtained;

[0048] (2) Synthesis of BSS-16

[0049] Add 13g of hexadecane bromide (BrC16H33), stir until completely dissolved, control the temperature of the water bath at 80-95°C, stir and reflux, and react for 10-14 hours; after the reaction is completed, a precipitate precipitates out, and after cooling and drying, N﹑N′-(di -sodium hexadecane dioctane sulfonate) ethylenediamine...

Embodiment 3

[0055] Preparation and evaluation of BSS-18

[0056] (1) Synthesis of N﹑N′-(sodium dinonanesulfonate)ethylenediamine

[0057] Put the reaction kettle with a stirrer and reflux condenser into a water bath, add 500mL ethanol+water mixture (v:v=3:2), add primary amine nonyl sodium sulfonate (NH 2 C 9 h 18 SO 3 Na) 10g, stir and heat up to 60-70°C, stir until completely dissolved, slowly add 1,2-dibromoethane (BrCH 2 CH 2 Br) 4.8g, control the temperature of the water bath at 85-95°C, stir and reflux, and react for 10-16 hours; the intermediate product N﹑N′-(sodium dinonanesulfonate)ethylenediamine is obtained;

[0058] (2) Synthesis of BSS-18

[0059] Add bromooctadecane (BrC 18 h 37 ) 14g, stir until completely dissolved, control the temperature of the water bath at 85-95°C to stir and reflux, and react for 10-16 hours; after the reaction is completed, a precipitate precipitates out, and after cooling and drying, N﹑N′-(di-octadecanediononanesulfonate Sodium acid) ethyle...

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Abstract

The invention relates to a drilling fluid suspending agent applied to a water-based drilling fluid to improve the suspending stability of barite powder, and a preparation method and an application thereof. The suspending agent is a sulfonate gemini surfactant, and the chemical name of the suspending agent is sodium N,N'-dialkyl dialkyl ethylenediamine sulfonate. The preparation method of the surfactant comprises the following steps: 1, putting a reaction kettle provided with a stirrer and a refluxing condensation tube in a water bath, adding an ethanol + water mixed liquid, adding sodium alkyl primary amine sulfonate, heating and stirring the mixed liquid and the sodium alkyl primary amine sulfonate to completely dissolve the sodium alkyl primary amine sulfonate, adding 1,2-dibromoethane, heating and refluxing above materials, carrying out a reaction for 8-16 h, stopping the reaction, and carrying out rotary evaporation to remove a solvent in order to obtain an intermediate sodium N,N'-dialkyl ethylenediamine sulfonate; and 2, adding the above product into the reaction kettle, adding long-chain brominated alkane while stirring, heating and refluxing the product and the brominated alkane for 8-16 h, cooling a precipitate obtained after the reaction, cooling the precipitate, carrying out suction filtration, and drying the filtered precipitate to obtain the sodium N,N'-dialkyl dialkyl ethylenediamine sulfonate. The surfactant can disperse and wet the barite powder in the water-based drilling fluid, and can keep the suspension of the barite powder stable while keeping the low rheological parameter of the drilling fluid.

Description

technical field [0001] The present invention relates to a suspending agent in water-based drilling fluid, in particular to a drilling fluid suspending agent that maintains the suspension stability of barite powder in water-based drilling fluid, and the present invention also relates to a preparation method of drilling fluid suspending agent and application. Background technique [0002] Drilling fluid, also known as "mud", refers to the fluid that satisfies the needs of drilling by carrying and suspending cuttings, stabilizing the well wall and balancing formation pressure, cooling and lubricating the drill bit and drilling tools, and transmitting hydraulic power during the drilling process. The general term for various circulating fluids. Drilling process refers to drilling, casing running, cementing and workover, unless otherwise specified. [0003] According to the composition characteristics of the fluid medium and system in the drilling fluid, it is generally divided ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/03C07C309/14C07C303/32
CPCC09K8/035C07C303/32C09K8/03C07C309/14
Inventor 陈二丁张海青杨龙波张涛刘贺李琼王其星王伟王刚王俊何鹏
Owner 中石化石油工程技术服务有限公司