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High-temperature soluble bridge plug and preparation method thereof

A high-temperature, bridge plug technology, applied in the field of high-temperature soluble bridge plugs and its preparation, to save man-hours and operating costs, reduce the risk and cost of drilling plug operations, and enhance the effect of high-temperature resistance

Active Publication Date: 2020-08-04
FUXIN CITY GASOLINEEUM TOOL FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially suitable for deep long horizontal shale gas well operations

Method used

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  • High-temperature soluble bridge plug and preparation method thereof
  • High-temperature soluble bridge plug and preparation method thereof
  • High-temperature soluble bridge plug and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 3g of butadiene and 6g of maleic anhydride, 0.09g of KH570 as a coupling agent, add 0.36g of acetanilide as an antigelling agent, dissolve them in 15g of DMF, and pour them into a 500mL three-neck flask equipped with a stirrer, Under nitrogen protection, the temperature was raised to 140°C. Then take 0.18g of diisodiazebutyronitrile and dissolve it in 5g of DMF, pour it into a constant pressure separatory funnel and drop it over two hours, as an initiator. Then reflux at 140°C for 4h, stop the reaction, and cool.

[0040] The solid-liquid mixture after the above reaction is centrifuged and washed, and vacuum-dried, and the obtained light yellow solid is the product used for the high-temperature soluble bridge plug under the action of high temperature. Gained solid product is made bottom area radius with mold and is 1cm, and height is 5cm cylinder shape. carry out testing.

[0041] Weigh 6g of KCl, dissolve it in 200g of water, and prepare a 3% solution as the w...

Embodiment 2

[0044] Weigh 3g of butadiene and 9g of maleic anhydride, 0.12g of KH570 as a coupling agent, add 0.48g of acetanilide as an antigelling agent, dissolve in 15g of DMF, pour into a 500mL three-neck flask equipped with a stirrer, Under nitrogen protection, the temperature was raised to 180°C. Then take 0.24g of diisodiazebutyronitrile dissolved in 5g of DMF, pour it into a constant pressure separatory funnel and drop it over two hours as an initiator. Then reflux at 180°C for 6h, stop the reaction, and cool.

[0045] The solid-liquid mixture after the above reaction is centrifuged and washed, and vacuum-dried, and the obtained light yellow solid is the product used for the high-temperature soluble bridge plug under the action of high temperature. Gained solid product is made bottom area radius with mold and is 1cm, and height is 5cm cylinder shape. carry out testing.

[0046] Weigh 8g of KCl, dissolve it in 200g of water, and prepare a 4% solution, as the working environment o...

Embodiment 3

[0049] Weigh 3g of butadiene and 9g of maleic anhydride, 0.18g of KH570 as a coupling agent, add 0.48g of acetanilide as an antigelling agent, dissolve them in 15g of DMF, and pour them into a 500mL three-neck flask equipped with a stirrer, Under nitrogen protection, the temperature was raised to 180°C. Then take 0.48g of diisodiazebutyronitrile dissolved in 5g of DMF, pour it into a constant pressure separatory funnel and drop it over two hours, as an initiator. Then reflux at 180°C for 4h, stop the reaction, and cool.

[0050] The solid-liquid mixture after the above reaction is centrifuged and washed, and vacuum-dried, and the obtained light yellow solid is the product used for the high-temperature soluble bridge plug under the action of high temperature. Gained solid product is made bottom area radius with mold and is 1cm, and height is 5cm cylinder shape. carry out testing.

[0051] Weigh 10g of KCl, dissolve it in 200g of water, and prepare a 5% solution as the workin...

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Abstract

The invention discloses a high-temperature soluble bridge plug and a preparation method thereof, and the preparation method comprises the following steps: 1) taking butadiene and maleic anhydride, adding an anticoagulant, adding azoisodiazobutyronitrile as an initiator to dissolve in DMF, adding KH570 as a coupling agent, taking DMF as a solvent, and heating in a constant-temperature oil bath under the protection of nitrogen, and carrying out sufficient reflux reaction at 140-180 DEG C, 2) carrying out centrifugal washing and vacuum drying on the reacted solid-liquid mixture to obtain a lightyellow solid, namely a raw material for the high-temperature soluble bridge plug, and carrying out thermoplastic molding on the obtained raw material by using a mold to prepare the high-temperature soluble bridge plug. The copolymer synthesized from the maleic anhydride and the butadiene has the characteristics of high temperature resistance, high pressure resistance and water solubility, is finally degraded into water and carbon dioxide, reduces the reverse discharge process, and is a biodegradable environment-friendly material. The high-temperature soluble bridge plug can be applied to development of outer shale gas and other unconventional gas reservoirs, liquid in a well enables the high-temperature soluble bridge plug to be automatically dissolved, shaft drilling and grinding operation and reverse drainage treatment are not needed, and shaft full-bore commissioning is achieved.

Description

technical field [0001] The invention relates to a high-temperature soluble bridge plug, in particular to a high-temperature soluble bridge plug and a preparation method thereof. Background technique [0002] Generally speaking, after the construction is completed, the soluble bridge plug will dissolve itself in the liquid environment in the well under certain temperature conditions, without the need for wellbore drilling and grinding, and realize the full-bore production of the wellbore. As a commonly used basic organic chemical monomer raw material, maleic anhydride has a great advantage in the dissolution process because the carboxyl group present in its molecular structure has good compatibility with polar solutions. The orthorhombic needle-like structure of butadiene can enhance high temperature resistance, wear resistance and small compression deformation. Therefore, the copolymer synthesized by maleic anhydride and butadiene is a polymer with polar groups in its molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/06C08F236/06E21B33/134
CPCC08F222/06E21B33/134C08F236/06
Inventor 杨晓武沈志峰王晨李培枝
Owner FUXIN CITY GASOLINEEUM TOOL FACTORY