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High-strength temporary blocking agent for oil and gas wells and preparation method and application thereof

A technology for oil and gas wells and temporary plugging agents, which can be used in wellbore/well components, drilling compositions, earth-moving drilling, etc. Less, the effect of forming a large pressure difference

Active Publication Date: 2014-05-14
ORIENT BAOLIN TECH DEV BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also the problem of layered fracturing in inclined vertical wells

Method used

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  • High-strength temporary blocking agent for oil and gas wells and preparation method and application thereof
  • High-strength temporary blocking agent for oil and gas wells and preparation method and application thereof
  • High-strength temporary blocking agent for oil and gas wells and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0098] Ratio of materials: thickener, dispersant, adhesive and heat-resistant material, the mass ratio of the thickener, dispersant, adhesive and heat-resistant material is 3:2:3:2.

[0099] The thickener is a mixture of coumarin and polyacrylamide in a mass ratio of 4:6; the dispersant is polyethylene wax; the adhesive is dextrin, and when the dextrin is diluted to 3%, The viscosity is 20mpa.s; the temperature-resistant material is boron carbide.

[0100] After mixing the above components, react in a 30-45MPa pressure vessel at 180°C for 3 hours.

[0101] The solubility properties of the obtained temporary plugging agent are as follows: Figure 3-Figure 6 shown.

preparation Embodiment 2

[0103] Ratio of materials: thickener, dispersant, binder and temperature-resistant material, the mass ratio of the thickener, dispersant, binder and temperature-resistant material is 2.5:1.3:2.8:1.7.

[0104] The thickener is a mixture of coumarin and polyacrylamide in a mass ratio of 4:6; the dispersant is polyethylene wax; the adhesive is dextrin, and when the dextrin is diluted to 2.5% The viscosity is 17mpa.s; the temperature-resistant material is boron carbide.

[0105] After mixing the above components, react in a 30-45MPa pressure vessel at 200°C for 3 hours.

preparation Embodiment 3

[0107] Ratio of materials: thickener, dispersant, binder and temperature-resistant material, the mass ratio of the thickener, dispersant, binder and temperature-resistant material is 2.5:2:2.9:1.8.

[0108] The thickener is a mixture of coumarin and polyacrylamide in a mass ratio of 4:6; the dispersant is polyethylene wax; the adhesive is dextrin, and when the dextrin is diluted to 2.7% The viscosity is 18.4mpa.s; the temperature-resistant material is boron carbide.

[0109] After mixing the above components, react in a pressure vessel of 30-45MPa for 3 hours under the condition of 150°C.

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Abstract

The invention relates to a high-strength temporary blocking agent for oil and gas wells and a preparation method and application thereof. The temporary blocking agent for oil and gas wells is prepared from the following ingredients through crosslinking reaction: thickening agent, dispersing agent, adhesive and a temperature resistant material with mass ratio of (2.5-3):(1.3-2):(2.8-3):(1.7-2), preferentially, 3:2:3:2. The temporary blocking agent for oil and gas wells has the advantages of high strength, filter cake formation, good solubility and controllable time, flowback is facilitated and the method is simple to operate.

Description

technical field [0001] The invention relates to the petroleum field, in particular to a high-strength oil and gas well temporary plugging agent, its preparation and its application. Background technique [0002] When multi-layer fracturing of inclined vertical wells is carried out, ball sliding sleeves + packers are usually used to realize the stimulation. The stimulation efficiency is low, and one tool can only stimulate one layer; due to the reasons of the tool itself, sliding sleeves often occur. If it is not opened, most layers cannot be transformed; the more the number of running tools, the greater the risk of running and construction. [0003] For multi-stage fracturing of horizontal wells, ball sliding sleeves + packers are used to achieve this. There is also the problem of layered fracturing in inclined vertical wells. like figure 1 , figure 2 shown. [0004] Therefore, it is urgent to invent a new layered / staged fracturing method to improve the efficiency of f...

Claims

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Application Information

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IPC IPC(8): C09K8/508E21B33/13
CPCC09K8/512C09K8/514E21B33/13
Inventor 杜林麟杜林涛王宇
Owner ORIENT BAOLIN TECH DEV BEIJING
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