In-situ activated geopolymer plugging agent and preparation method thereof

A technology of geopolymer and plugging agent, which is applied in drilling compositions, chemical instruments and methods, and earthwork drilling and mining, and can solve the problems of large loss of plugging agent

Active Publication Date: 2021-10-19
SINOPEC SSC +2
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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 defect of large loss of current pl

Method used

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  • In-situ activated geopolymer plugging agent and preparation method thereof
  • In-situ activated geopolymer plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1) Preparation of pre-embedded activator: (1) Add 300g of flake sodium hydroxide, 200g of dry powdered water glass (modulus 2.0), 100g of sodium fluorosilicate and 1200g of deionized water in the autoclave, and the system Increase the temperature to 60°C, increase the stirring speed to 2000rpm, and alkalize for 30 minutes; (2) Add 1200g chitosan and 1000g deionized water to the above reactor in sequence, raise the system temperature to 150°C, and increase the stirring speed Reduce to 300rpm, continue to react for 30min; (3) after the reaction is over, cool, vacuum filter three times, collect the corresponding microspheres, wash the surface of the microspheres with deionized water three times, transfer to a rotary evaporator, remove the remaining solvent, and obtain Pre-embedded activators.

[0056] 2) Preparation of in-situ activated geopolymer plugging agent: (1) Add 2200g metakaolin, 1800g red mud, and 2100g pozzolan powder in sequence to a high-temperature and high-p...

Embodiment 2

[0058] 1) Preparation of pre-embedded activator: (1) Add 400g of flake sodium hydroxide, 250g of dry powdered water glass (modulus 2.5), 125g of sodium fluorosilicate and 1350g of deionized water in the autoclave, and the system Increase the temperature to 70°C, increase the stirring speed to 2000rpm, and alkalinize for 40 minutes; (2) Add 1350g chitosan and 1250g deionized water to the above reactor in sequence, raise the system temperature to 165°C, and increase the stirring speed Reduce to 300rpm, continue to react for 40min; (3) After the reaction is over, cool, vacuum filter three times, collect the corresponding microspheres, wash the surface of the microspheres with deionized water three times, transfer to a rotary evaporator, remove the remaining solvent, and obtain Pre-embedded activators.

[0059] 2) Preparation of in-situ activated geopolymer plugging agent: (1) Add 2350g metakaolin, 1900g red mud, and 2350g pozzolan powder in sequence to a high-temperature and high...

Embodiment 3

[0061] 1) Preparation of pre-embedded activator: (1) Add 500g of flake sodium hydroxide, 300g of dry powdered water glass (modulus 3.0), 150g of sodium fluorosilicate and 1500g of deionized water in the autoclave, and the system Increase the temperature to 80°C, increase the stirring speed to 2000rpm, and alkalinize for 50 minutes; (2) Add 1500g chitosan and 1500g deionized water to the above reactor in sequence, raise the system temperature to 180°C, and increase the stirring speed Reduce to 300rpm, continue to react for 50min; (3) After the reaction is over, cool, vacuum filter three times, collect the corresponding microspheres, wash the surface of the microspheres with deionized water three times, transfer to a rotary evaporator, remove the remaining solvent, and obtain Pre-embedded activator.

[0062] 2) Preparation of in-situ activated geopolymer plugging agent: (1) Add 2500g metakaolin, 2000g red mud, and 2600g pozzolan powder in sequence to a high-temperature and high-...

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Abstract

The invention discloses an in-situ activated geopolymer plugging agent, which is prepared from the following components: 2200-2500 g of metakaolin, 1800-2000 g of red mud, 2100-2600 g of volcanic ash powder, 300-500 g of nano-fibers, 280-320 g of micron fibers and 260-320 g of a pre-embedded activating agent. The preparation method comprises the following steps that: firstly, a composite activator composed of sodium hydroxide, water glass and sodium fluosilicate with a synergistic effect is embedded in chitosan particles; and then, geopolymer raw materials (metakaolin, red mud and volcanic ash powder) are pre-meshed through a high-temperature and high-pressure kneading machine, then, nano-fibers and micron fibers are mixed, and on the basis, the pre-embedded activator is added for further meshing, so that the geological plugging agent with in-situ activation characteristic is formed. After the plugging agent enters a leakage layer, the chitosan wall is softened, extruded and fractured, and the composite activator is released and reacts with the raw materials to quickly generate a geopolymer. Meanwhile, the strength and toughness of a polymer plugging layer are improved through the stretching effect of nano-micron fibers, so that the effects of quickly plugging and improving the pressure bearing capacity of the well wall are achieved.

Description

technical field [0001] The invention relates to a lost circulation agent for drilling fluid in the field of drilling chemical auxiliary agents, that is, when a leaky layer is drilled, the lost circulation agent is circulated to the leaky layer to be activated to form a geopolymer lost circulation agent. Background technique [0002] As oil and gas exploration and development gradually move towards difficult-to-produce reservoirs, the formations encountered by drilling are becoming more and more complex, especially in fractured formations and depleted formations. If the drilling fluid density is too high, lost circulation will occur, and in severe Vicious leakage is caused, and in severe cases, it may lead to complex accidents such as well wall collapse and drilling fluid loss. At this time, it is necessary to add a high-efficiency plugging agent to the drilling fluid to seal the leaky layer and resume drilling operations. At present, most of the plugging agents used are rig...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/38C04B7/24C04B12/00C09K8/03C09K8/42C09K8/467E21B33/13C04B111/72
CPCC04B28/006C04B7/243C04B12/005C04B40/0039C09K8/03C09K8/426C09K8/467E21B33/13C09K2208/08C04B2111/00724C04B2111/72C04B18/248C04B22/062C04B22/00C04B22/124C04B24/38Y02P40/10
Inventor 蓝强夏晔郑成胜姜春丽徐运波周晓蕾王俊李蕾杨龙波经淑惠
Owner SINOPEC SSC
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