Temperature-control expansion plugging material for well drilling and preparation method thereof

A plugging material and drilling technology, which are applied in the directions of building thermal insulation materials, chemical instruments and methods, drilling compositions, etc., can solve problems such as being unsuitable for drilling plugging operations, affecting the effect of plugging, and reducing the strength of materials.

Inactive Publication Date: 2021-05-28
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing expandable plugging materials include liquid-absorbing swelling resins or polymers. The hydrophilic groups in the chemical materials absorb water and expand in the leaky layer to enhance the plugging effect. The strength of the lost circulation significantly decreases, which affects the plugging effect; there are also some intelligent expansion materials, such as memory alloys, memory polymers, etc., which rely on the special properties of the material to achieve expansion under specific formation conditions. Not suitable for large-scale drilling and plugging operations

Method used

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  • Temperature-control expansion plugging material for well drilling and preparation method thereof
  • Temperature-control expansion plugging material for well drilling and preparation method thereof
  • Temperature-control expansion plugging material for well drilling and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take a polyurethane foam with a length of 500mm, a width of 400mm, a thickness of 10mm, and a pore diameter of 0.4mm (provided by Shuxin Sponge Factory, Xihe Town, Longquanyi District), and immerse it in molten 64# paraffin (provided by the E-Commerce Operation Department of Dakang Industrial Raw Materials, Linyi Mall) ), let the paraffin fully enter the polyurethane foam, and then place the paraffin-coated polyurethane foam on a flat press before the paraffin solidifies, and slowly pressurize to compress the polyurethane foam thickness to 3mm. After the paraffin is completely solidified, use scissors The cutting equipment cuts the compressed and shaped polyurethane foam into particles of different shapes with a side length of about 2-5mm to obtain a temperature-controlled expansion plugging material for drilling.

Embodiment 2

[0032] Get long 500mm, wide 400mm, thick 30mm, the polyurethane foam (provided by Shuxin Sponge Factory, Xihe Town, Longquanyi District) with a length of 500mm, wide 400mm, thick 30mm, and immerse it in melting 90# microcrystalline wax (Hebei Dongguang County Qinyuan Wax Products Factory) Provided), let the microcrystalline wax fully enter the polyurethane foam, and then place the polyurethane foam covered with the microcrystalline wax on a flat press before the microcrystalline wax solidifies, and pressurize slowly to compress the thickness of the polyurethane foam to 5mm. After the microcrystalline wax is completely solidified, use a shearing device to cut the compressed and shaped polyurethane foam into particles of different shapes with a side length of about 3-6 mm to obtain a temperature-controlled expansion plugging material for drilling.

Embodiment 3

[0034]Take a polyurethane foam with a length of 500mm, a width of 400mm, a thickness of 30mm, and a pore diameter of 0.8mm (provided by Shuxin Sponge Factory, Xihe Town, Longquanyi District), and immerse it in molten Fischer-Tropsch wax (provided by the E-Commerce Operation Department of Dakang Industrial Raw Materials, Linyi Mall) ), allow the Fischer-Tropsch wax to fully enter the polyurethane foam, then place the polyurethane foam coated with the Fischer-Tropsch wax on a flat press before the Fischer-Tropsch wax solidifies, pressurize slowly, and compress the thickness of the polyurethane foam to 5mm. After the wax is completely solidified, use a shearing device to cut the compressed and shaped polyurethane foam into particles of different shapes with a side length of about 3-6 mm to obtain a temperature-controlled expansion plugging material for drilling.

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Abstract

The invention provides a temperature-control expansion plugging material for well drilling. The temperature-control expansion plugging material comprises an elastic foam material; and a meltable material which is coated on the surface of the elastic foam material. The expansion temperature of the plugging material provided by the invention is controlled by the softening point of paraffin or asphalt wrappage, and after the plugging material enters a leakage layer, under the action of formation temperature, the polyurethane foam gradually expands along with the melting of the paraffin or asphalt to recover the original size and accumulates and resides in the leakage layer, thereby providing a residence foundation for other plugging materials, and improving the plugging efficiency. The invention also provides a preparation method of the temperature-control expansion plugging material for well drilling.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a temperature-controlled expansion plugging material for drilling and a preparation method thereof. Background technique [0002] Lost circulation is one of the most frequently occurring downhole problems in oil and gas drilling engineering. Lost circulation not only loses a large amount of drilling fluid and plugging materials, delays the drilling cycle, but may induce well collapse, overflow, or even blowout accidents in severe cases, resulting in serious economic losses. and loss of security. The treatment of lost circulation has always been an important research direction of drilling engineering scientific research and technical personnel. A series of plugging materials and corresponding plugging technologies have been developed and formed, among which bridge plugging technology is the most widely used one. There are various types of bridge plugging materials used in pluggi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C08J9/42C08L75/04C08L91/06C08L23/06C08L95/00
CPCC09K8/426C08J9/42C08J2375/04C08J2491/06C08J2423/06C08J2495/00
Inventor 赵正国王中华郭建华乐明李旭东吕跃滨
Owner 中石化石油工程技术服务有限公司
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