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Nanofiber compound-based shale formation blocking agent for drilling fluid and preparation method

A technology of nanofibers and composites, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as ineffective anti-slump agents, instability of well walls, poor shale effects, etc., and achieve obvious Mud shale plugging effect, temperature resistance improvement, and the effect of improving stability and wellbore stability

Active Publication Date: 2019-05-28
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the wellbore instability problem existing in the mud shale drilling process, the effect of most anti-slump agents is not obvious, including commonly used amine-based inhibitors in mud shale with low clay content In order to solve the problems such as poor effect, a mud shale formation plugging agent based on nanofiber composite for drilling fluid and its preparation method are proposed

Method used

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  • Nanofiber compound-based shale formation blocking agent for drilling fluid and preparation method

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preparation example Construction

[0024] The specific preparation method of the present invention comprises the following steps:

[0025] 1. Pretreatment of bagasse

[0026] (1) Clean the bagasse with deionized water, dry it, and press it with a press for several times in a row. After squeezing out all the sugar, clean it with deionized water, put it in an oven, and heat it at 80℃± Dry at 5°C for 5 hours and take it out;

[0027] (2) Pulverize the dried bagasse with a pulverizer, test with a standard inspection sieve, pulverize to 800 mesh to 1000 mesh, and set aside.

[0028] 2. Preparation of shale formation plugging agent based on nanofiber composite

[0029] (1) Pour 300~400g of 98% sulfuric acid into a 1000mL beaker, slowly add deionized water dropwise, while stirring gently with a glass rod until the sulfuric acid is diluted to 64wt%;

[0030] (2) Add 120~160g of pretreated bagasse into a 1000mL three-necked flat-bottomed flask, slowly add 64wt% sulfuric acid in (1), stir at 100rpm at a low speed for ...

specific Embodiment 1

[0038] Pour 300g of 98% sulfuric acid into a 1000mL beaker, slowly add deionized water dropwise, while stirring gently with a glass rod, until the sulfuric acid is diluted to 64wt%; add 120g of pretreated bagasse To a 1000mL three-necked flat-bottomed flask, slowly add 64wt% sulfuric acid prepared in the previous step, and stir at a low speed of 100rpm for 40min. Transfer to a 2000mL plastic cup, add excess deionized water to terminate the reaction; transfer the above dispersion system to a centrifuge in batches, centrifuge at 10000rpm for 20min, precipitate, pour out the supernatant, add deionized water, Centrifuge at high speed again until the supernatant is clear, and centrifuge several times until the pH of the system is 3~4; dialyze the above-mentioned dispersion system in batches through regenerated cellulose dialysis bags (pore size 20nm) in deionized water, and the dialysis time is 6 days until the pH of the system is 6~8; put the dialysis dispersed system into a high-...

Embodiment 2

[0040] Pour 350g of 98% sulfuric acid into a 1000mL beaker, slowly add deionized water dropwise, while stirring gently with a glass rod, until the sulfuric acid is diluted to 64wt%; 120~160g pretreated sugarcane Add the slag to a 1000mL three-neck flat-bottomed flask, slowly add the 64wt% sulfuric acid prepared in the previous step, and stir at a low speed of 100rpm for 50min. Transfer the dispersion system into a 2000mL plastic cup, add excess deionized water, and terminate the reaction; transfer the above dispersion system to a centrifuge in batches, centrifuge at 10000rpm for 20min, settle, pour out the supernatant, and add deionized water, centrifuged at high speed again until the supernatant was clear, and centrifuged several times until the pH of the system was 3~4; the above dispersion system was dialyzed in deionized water through regenerated cellulose dialysis bags (pore size 20nm) in batches, and dialyzed The time is 7 days until the pH of the system is 6~8; the disp...

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Abstract

The invention relates to a nanofiber compound-based shale formation blocking agent for drilling fluid and a preparation method. The blocking agent is prepared from the following raw materials: bagasse, a dispersant, nano silica, nano graphite and deionized water. A nanofiber compound method is adopted to form the efficient blocking agent for effectively blocking nano pores and micro-nano cracks bycompounding various types of nano particles, the method is simple and reliable, and the prepared shale blocking agent has little influence on the performance of the drilling liquid, but has an obvious shale blocking effect. The blocking rate of base mud added with the amount of 3.0 percent by weight of a nanofiber compound in a shale core exceeds 96%, while under the conditions of high temperature and high pressure (180 DEG C / 6MPa), the blocking capacity remains basically unchanged (higher than 93%), and the treatment agent is non-toxic, has no adverse effects on environment, has acute toxicity EC50 which is greater than 60000, and is an efficient shale blocking agent.

Description

technical field [0001] The invention relates to a wellbore stabilizer for drilling fluid. Specifically, the drilling fluid needs to have a certain wellbore stabilization function during the drilling process, so that it can keep the wellbore stable during drilling in complex formations and avoid corresponding complicated accidents. Background technique [0002] The success of a drilling operation is influenced by many factors, one of the most important of which is the drilling fluid. Drilling fluid, also known as drilling mud, enters the drill string from the surface, descends to the bottom of the well, and is ejected through the water hole of the drill bit, carrying cuttings, and returns to the ground from the annular space between the drilling tool and the well wall. Drilling fluid has multiple functions, such as cooling and lubricating the drill bit, removing cuttings in drilling, preventing formation damage, effectively suspending solid particles such as cuttings and weig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/46
Inventor 蓝强徐运波郑成胜张妍张虹吴雄军于雷陈健刘振东
Owner CHINA PETROCHEMICAL CORP
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