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Soluble temporary plugging material for oil and gas well fracturing, temporary plugging agent, fracturing fluid and preparation method thereof

A soluble technology for oil and gas wells, applied in the field of fracturing fluid and its preparation, soluble temporary plugging materials for oil and gas well fracturing, and temporary plugging agents, which can solve the problems of increased construction period, formation damage, and poor solubility of cross-linked polymers and other issues, to achieve the effects of increased production, less formation damage, and good temporary blocking and steering effects

Active Publication Date: 2018-07-10
四川安东油气工程技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, polymers with polyacrylamide as the main body are also used as temporary plugging agents, and their plugging strength and temporary plugging rate can also meet the requirements of on-site construction, but after degradation, they have high viscosity, which makes the fracturing fluid Increased viscosity is not conducive to flowback after construction, and will cause greater damage to the formation
[0005] The existing various temporary plugging agents have certain temporary plugging performance but also have their own defects. The release of inorganic salts during the dissolution process of the system composed of inorganic salts will cause permanent blockage of the formation, which is not conducive to later oil and gas production; cross-linking Cross-linked polymers need to be added with a gel breaker after construction to break the gel. In construction operations that require a long temporary plugging time, the construction cycle will be increased, resulting in increased costs. At the same time, the solubility of cross-linked polymers is poor, and some If the gel cannot be completely broken in the fluid, it will also stay in the formation and affect the later mining process; the dissolution of the PAM temporary plugging agent will increase the viscosity of the fracturing fluid, which is not conducive to the flowback of the fracturing fluid

Method used

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  • Soluble temporary plugging material for oil and gas well fracturing, temporary plugging agent, fracturing fluid and preparation method thereof
  • Soluble temporary plugging material for oil and gas well fracturing, temporary plugging agent, fracturing fluid and preparation method thereof
  • Soluble temporary plugging material for oil and gas well fracturing, temporary plugging agent, fracturing fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Nitrogen was passed through the reaction system to replace the air, and then fumaric acid (fumaric acid) and pentaerythritol monomers were added into a four-necked round-bottomed flask according to the mass ratio and stirred, wherein 98.5 g of fumaric acid was added into 100 g of distilled water to fully dissolve , add 110 g of pentaerythritol; then add 0.32 g of initiator and gradually heat the system to 100 ° C, after 25 min of heat preservation, add AMPS solution neutralized with sodium hydroxide to the system (dissolve with distilled water, add 25 g of AMPS to 25 g of distilled water, then add 4 g sodium hydroxide). Then the temperature of the system was raised to 140°C and kept for 0.5h. Then, 15 g of phenoxyethanol was added to the reaction system for reaction, and 0.08 g of initiator was added and the temperature was raised to 165° C., and the temperature was lowered after 2 hours of reaction. After the reaction is completed, the obtained product is purified and...

Embodiment 2

[0033] Nitrogen was passed through the reaction system to replace the air, and then itaconic acid and trimethylolpropane monomers were added into a four-necked round-bottomed flask according to the mass ratio and stirred, wherein 105g of itaconic acid was fully dissolved in 100g of distilled water, and trimethylolpropane was added Methylpropane 97g; then add 0.30g initiator and gradually heat up the system to 105°C, keep warm for 30min and add AMPS solution neutralized with sodium hydroxide to the system (dissolve with distilled water, add 21g AMPS to 30g distilled water, then add 4g sodium hydroxide). Then the temperature of the system was raised to 150°C and kept for 0.5h. Then, 14.5 g of phenoxyethanol was added to the reaction system for reaction, and 0.12 g of initiator was added and the temperature was raised to 180° C., and the temperature was lowered after 2 hours of reaction. After the reaction is completed, the obtained product is purified and dried to obtain the pr...

Embodiment 3

[0038] It is formed by melt spinning method. The soluble temporary plugging material chip obtained in Example 1 is heated and melted into a melt in a screw extruder, and enters the spinning machine after the pre-spinning preparation process, and the spinning melt is quantitatively and continuously melted by a spinning pump (metering pump). , Extruded evenly from the fine holes of the spinneret, then cooled and solidified in the air to form primary fibers, and then cut into fibers with a length of 5-10mm to obtain temporary plugging fibers.

[0039]The soluble temporary plugging material obtained in Example 1 was heated, melted and extruded by a screw extruder, cut and granulated by a granulator, and shaped into particles with a particle size of 5-8 mm to obtain temporary plugging particles.

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Abstract

The invention discloses a soluble temporary plugging material for oil and gas well fracturing, a temporary plugging agent, a fracturing fluid and a preparation method thereof, wherein the temporary plugging material is a polymer prepared from raw materials with the following mass percentage: binary C4-C6 Carboxylic acid 25‑30%; 2‑acrylamido‑2‑methylpropanesulfonic acid 7‑10%; C4‑C7 polyol 20‑25%; monohydric alcohol with a single benzene ring structure 5‑8%; Initiator 0.08‑0.15%; sodium hydroxide 1.5‑2%; distilled water 30%. The temporary plugging material of the embodiment of the present invention completely dissolves in fracturing fluid environments at different temperatures without residual solids.

Description

technical field [0001] The invention relates to the technical field of oil and gas well fracturing materials, in particular to a soluble temporary plugging material for oil and gas well fracturing, a temporary plugging agent, a fracturing fluid and a preparation method thereof. Background technique [0002] my country's low-permeability oilfields are rich in petroleum geological reserves, and their resources account for about 30% of the country's total petroleum resources. Among the proven reserves, low-permeability oil reservoirs account for more than two-thirds of the country's reserves, and the development potential is huge. Although most low-permeability reservoirs have a large increase in production after fracturing, the production is still not high. In recent years, major oilfields have adopted multi-fracture technology or fracture diversion technology in the fracturing operation to intensify efforts to stimulate low-permeability reservoirs and maximize reservoir produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508C09K8/68C09K8/88
CPCC09K8/5086C09K8/685C09K8/887C09K2208/06
Inventor 徐太平李栓白皓晨
Owner 四川安东油气工程技术服务有限公司
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