pH-responsive drilling fluid aluminum-based anti-sloughing agent and preparation method thereof

An anti-slump agent and drilling fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the outstanding problems affecting the anti-slump effect, reducing the ability to react with clay minerals entering the formation and the formation, and the compatibility of the drilling fluid system and other problems, to achieve the effect of improving anti-slump ability, easy industrial application, and easy control of reaction

Active Publication Date: 2017-07-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aluminum ions mainly exist in the non-water-soluble form in the drilling fluid environment, which reduces their ability to enter the formation and react with clay minerals in the formation, affecting the anti-slump effect and the compatibility problem with the drilling fluid system is prominent

Method used

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  • pH-responsive drilling fluid aluminum-based anti-sloughing agent and preparation method thereof
  • pH-responsive drilling fluid aluminum-based anti-sloughing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Preparation of aluminum-based anti-slump agent: In a 500mL three-necked bottle, pump and vent three times, pass in argon, add 30g of polyethylene glycol (number average molecular weight is 500), pump and vent three times, pass into Argon, add 30g of lactide, then add 30mg of stannous octoate, raise the temperature to 80°C, and react for 12h to obtain a polymer product. Cool the polymer product down to room temperature, add 100mL water and 90g AlCl to the polymer product 3 ·6H 2 O, lower the temperature to 10°C, and fully react for 24 hours to obtain a complex product. Adding NaOH solution with a mass concentration of 5 wt% to the complexed product to adjust the pH to 8 to obtain a neutralized product. Then, the neutralized product was heated and concentrated, dried and pulverized to obtain 180 g of a pH-responsive aluminum-based anti-slump agent.

[0046] The molecular structure of the anti-slump agent sample and the intermediate product (polymerization product, ...

Embodiment 2

[0049] (1) Preparation of aluminum-based anti-slump agent: In a 1000mL three-neck bottle, pump and vent three times, pass argon, add 30g polyethylene glycol (number average molecular weight is 1000), pump and vent three times, pass into Argon, add 150g of caprolactone, then add 60mg of stannous octoate, raise the temperature to 100°C, and react for 10h to obtain a polymer product. The polymer product is cooled down to room temperature, and 250 mL of water and 240 g of Al are added to the polymer product 2 (SO 4 ) 3 16H 2 O, the temperature was raised to 100°C, and the complex reaction was fully reacted for 1 hour to obtain a complex product. A KOH solution with a mass concentration of 30 wt % was added to the complexed product to adjust the pH to 9 to obtain a neutralized product. Then the neutralized product was heated and concentrated, dried and pulverized to obtain 475 g of pH-responsive aluminum-based anti-slump agent.

[0050] (2) Evaluation of pH response performanc...

Embodiment 3

[0052] (1) Preparation of aluminum-based anti-slump agent: In a 1500mL three-necked bottle, pump and vent three times, add 30g of polyethylene glycol (number average molecular weight is 4000), pump and vent three times, feed argon, add 300g Valerolactone, then add 10 mg of stannous octoate, raise the temperature to 160°C, and react for 1 hour to obtain a polymer product. The polymer product was cooled down to room temperature, and 300 mL of water and 300 g of KAl(SO 4 ) 2 12H 2 O, the temperature was raised to 90°C, and the reaction was completed for 3 hours to obtain a complex product. Adding mass concentration to the complex product is 40wt% Na 2 CO 3 The pH of the solution was adjusted to 10 to obtain a neutralized product. Then the neutralized product was heated and concentrated, dried and pulverized to obtain 750 g of a pH-responsive aluminum-based anti-slump agent.

[0053] (2) Evaluation of pH response performance The same as in Example 1, the pH response value of...

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Abstract

The present invention relates to a pH-responsive drilling fluid aluminum-based anti-sloughing agent and a preparation method thereof. According to the present invention, the pH-responsive drilling fluid aluminum-based anti-sloughing agent prepared by carrying out a reaction on polyether polyol, a lactone monomer, an initiator, an aluminum compound and a pH value adjuster has pH responsiveness, stably exists in the drilling fluid (the pH value is more than 8) in the form of a dissolved state, can rapidly respond within a pH responsive range (the pH value is more than or equal to 5 and is less than or equal to 7.5) to form aluminum hydroxide precipitate, and can block stratum bore throat and micro-cracks through physical and chemical action, can improve the collapse resistance of the aluminum-based drilling fluid, can strengthen the stability of the borehole wall, and can meet the complex stratum exploration and development requirements; and the preparation method has characteristics of simpleness, easy reaction control, low production cost, stable product quality, and easy industrial application.

Description

technical field [0001] The invention belongs to the technical field of anti-slump agents for drilling fluids, and in particular relates to a pH-responsive aluminum-based anti-slump agent for drilling fluids and a preparation method thereof. Background technique [0002] Wellbore stability is a very complicated problem often encountered in drilling engineering. As the exploration field expands to deep formations, the formations encountered become more and more complex, and the wellbore instability has become an obstacle to the realization of exploration goals. Borehole wall instability is mainly manifested as diameter shrinkage, borehole wall collapse, borehole expansion, pipe sticking, electrical logging resistance, etc. These accidents will not only reduce drilling speed, prolong well construction period, increase operating cost, and reduce cementing quality A series of problems will make it impossible to drill to the target layer in some areas, delay the timing of drilling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
CPCC09K8/03
Inventor 孔勇杨小华王海波王琳杨帆董晓强李胜
Owner CHINA PETROLEUM & CHEM CORP
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