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Oilfield temperature-resistant plugging agent and preparation method thereof

A plugging agent and temperature-resistant technology, which is applied in the field of temperature-resistant plugging agents in oil fields and their preparation, can solve the problems of low success rate of sealing and channeling of high-temperature oil reservoirs, regression of cement stone strength, and increased permeability, etc. The effect of high sealing and channeling success rate, long validity period and strong resistance to high temperature strength attenuation

Active Publication Date: 2021-09-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When Portland cement reaches the critical temperature (110°C, 150°C), not only will it face the technical problems of cement blending under the action of high temperature, but also the strength of cement stone will regress and the permeability will increase. The success rate of blocking channel is low and the validity period is short

Method used

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preparation example Construction

[0072] On the other hand, the embodiments of the present invention also provide a method for preparing an oilfield temperature-resistant plugging agent, wherein the preparation method includes the following steps:

[0073] Step 101. According to mass percentage, mix aluminate cement powder, fly ash, and microsilica in a ball mill evenly to obtain a solid mixture.

[0074] Step 102, adding the stabilizer and regulator into water, stirring until dissolved, to obtain a mixed solution;

[0075] Step 103, adding the solid mixture into the mixed solution and stirring evenly to obtain the oilfield temperature-resistant plugging agent.

[0076] The preparation method of the oilfield temperature-resistant plugging agent provided by the embodiment of the present invention is to add the solid mixture composed of aluminate cement powder, fly ash and microsilica powder to the mixed solution composed of stabilizer, regulator and water , Stir evenly, can get oilfield temperature-resistant p...

Embodiment 1

[0098] This embodiment provides a temperature-resistant plugging agent for oilfields, which includes the following components in mass percentage: 56.16% aluminate cement powder with different particle sizes, 1.78% fly ash, 3.91% silica fume, 1.71% % conditioner, 0.07% stabilizer, and the balance tap water.

[0099] Among them, according to the mass of aluminate cement powder as 100%, aluminate cement powder includes: aluminate cement powder with an average particle size of 5 μm-9 μm with a mass percentage of 59%, and a mass percentage of 41% aluminate cement flour with an average particle size of 27 μm-34 μm. The average particle size of the fly ash used is 45 μm, the average particle size of microsilica is 0.15 μm, the stabilizer is hydroxymethyl hydroxyethyl cellulose, and the regulator is acrylic acid / acrylamide methyl propane sulfonic acid copolymer .

Embodiment 2

[0101] This embodiment provides an oilfield temperature-resistant plugging agent, which includes the following components in mass percentage: 53.38% aluminate cement powder with different particle sizes, 3.56% fly ash, 6.41% microsilica, 1.74% % conditioner, 0.04% stabilizer, and the balance tap water.

[0102] Among them, according to the mass of aluminate cement powder as 100%, aluminate cement powder includes: aluminate cement powder with an average particle size of 5 μm-9 μm with a mass percentage of 66%, and a mass percentage of 34% aluminate cement flour with an average particle size of 27 μm-34 μm. The average particle size of the fly ash used is 50 μm, the average particle size of the silica fume is 0.11 μm, the stabilizer is 2-hydroxyethyl cellulose, and the regulator is triethanolamine.

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Abstract

The embodiment of the invention discloses an oilfield temperature-resistant plugging agent and a preparation method thereof, and belongs to the technical field of oil-water well plugging, the oilfield temperature-resistant plugging agent comprises the following components by mass: 53-57% of aluminate cement powder with various particle sizes; 1.7%-4% of fly ash; 3%-7% of silica fume; 0.003%-0.1% of a stabilizer; 1%-2.5% of a conditioning agent; and the balance of water. The oilfield temperature-resistant plugging agent provided by the embodiment of the invention is relatively low in initial consistency, and the thickening time is more than 6.5 h under the conditions of 150 DEG C and 50 MPa; the compressive strength is larger than 29 MPa, and the requirements for deep well seal layer and channeling sealing strength are met; and the compressive strength is always kept at 28 MPa or above within 168 hours under the condition of 150 DEG C.

Description

technical field [0001] The invention relates to the technical field of oil-water well plugging, in particular to an oilfield temperature-resistant plugging agent and a preparation method thereof. Background technique [0002] With the acceleration of deep exploration, the drilling of deep formations is increasing day by day, so more and more deep wells and ultra-deep wells are encountered, and the downhole temperature is relatively high. Oil well plugging is the main measure to stabilize oil and control water in the later stage of oilfield development. One, in the face of such high-temperature oil reservoir plugging, there is a severe test on the temperature resistance of conventional plugging agent systems. [0003] At present, the plugging agent systems provided by the prior art mainly include: organic blocking agent systems and inorganic particle blocking agent systems. The organic plugging agent system is basically a polymer gel, which is widely used at present and has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C09K8/03C09K8/504C09K8/514
CPCC04B28/06C09K8/03C09K8/5045C09K8/514C04B2111/00724C04B18/08C04B18/146C04B24/383C04B24/163C04B24/122C04B24/008Y02W30/91
Inventor 齐行涛于永生邹小萍代晋光刘贺何磊王浩曹作为仲华廖翰明
Owner PETROCHINA CO LTD
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