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High temperature-resistant leakage stopping agent, and preparation method and application thereof

A plugging agent, high temperature resistance technology, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of poor high temperature resistance, inability to form plugging, etc., achieve stable performance, improve high temperature resistance, high the effect of strength

Active Publication Date: 2017-06-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the existing chemical plugging agents have poor high temperature resistance, and when the formation temperature is high, the pores and fractures in the formation cannot be well controlled. plugging

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  • High temperature-resistant leakage stopping agent, and preparation method and application thereof
  • High temperature-resistant leakage stopping agent, and preparation method and application thereof

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preparation example Construction

[0057] The lost circulation agent provided by the embodiment of the present invention can be prepared by the following method, and the preparation method includes the following steps:

[0058] Step a, dissolving polyacrylamide in water to obtain a polyacrylamide solution according to a predetermined formula of a leakage stoppage agent;

[0059] Step b, adding sulfonated phenolic resin and hexamethylenetetramine to the polyacrylamide solution, stirring until completely dissolved to obtain a polymer solution;

[0060] Step c, adding alkaline pH regulator, water-swellable granular plugging agent and one-way pressure sealing agent into the above polymer solution, stirring until completely dissolved to obtain the high temperature resistant plugging agent.

[0061] The usage method of the leak-stopping agent provided by the embodiment of the present invention is as follows: the leak-stopping agent is prepared in the surface tank and transported to the formation where leakage occurs ...

Embodiment 1

[0068] This embodiment provides an anti-high temperature plugging agent, which includes the following components in mass percentage:

[0069] Polyacrylamide, 2%;

[0070] Sulfonated phenolic resin, 1%;

[0071] Water-swellable granular plugging agent, 5%;

[0072] Hexamethylenetetramine, 1%;

[0073] One-way pressure sealant, 5%;

[0074] Sodium hydroxide, 0.5%;

[0075] Water, 85.5%.

[0076] The preparation method of the anti-high temperature plugging agent is as follows: according to the above ratio, polyacrylamide is dissolved in water to obtain a polyacrylamide solution; sulfonated phenolic resin and hexamethylenetetramine are added to the above polyacrylamide solution, Stir until completely dissolved to obtain a polymer solution; add sodium hydroxide, water-absorbing swellable particle sealing agent and one-way pressure sealing agent to the above polymer solution, stir until completely dissolved to obtain the high temperature resistant plugging agent of this embodim...

Embodiment 2

[0079] This embodiment provides an anti-high temperature plugging agent, which includes the following components in mass percentage:

[0080] Polyacrylamide, 2.5%;

[0081] Sulfonated phenolic resin, 1.5%;

[0082] Water-swellable granular plugging agent, 3%;

[0083] Hexamethylenetetramine, 1.5%;

[0084] One-way pressure sealant, 3%;

[0085] Water, 88.5%.

[0086] The preparation method of the anti-high temperature plugging agent is the same as that in Example 1.

[0087] The anti-high temperature plugging agent does not undergo cross-linking reaction at room temperature, and does not form a gel. The apparent viscosity at room temperature is 116mPa·s, and the cross-linking reaction begins to occur at 120°C for 3 hours, and the colloid formed after standing for 8 hours The strength reaches the maximum. At this time, the viscosity of the colloid is 80206mPa s, the elastic modulus is 543.2Pa, and the viscous modulus is 104.1Pa. 2 After the core is plugged, the bearing pr...

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Abstract

The invention discloses a high temperature-resistant leakage stopping agent, and a preparation method and an application thereof, and belongs to the technical field of petroleum drilling leakage stopping. The high temperature-resistant leakage stopping agent comprises, by mass, 2-3% of polyacrylamide, 1-2% of sulfonated phenolic resin, 0.9-2% of hexamethylenetetramine, 3-5% of a water swelling type granular plugging agent, 2-6% of a unidirectional pressure blocking agent, 0-3% of an alkaline pH regulator, and the balance of water. The leakage stopping agent has good high temperature resistance, and can meet leakage stopping needs of 80-150 DEG C drilling. The leakage stopping agent has low viscosity and low fluidity before forming gel, and is convenient for leakage stopping construction; and the leakage stopping agent has high strength and high stability after forming the gel, and has good plugging performance.

Description

technical field [0001] The invention relates to the technical field of oil drilling plugging, in particular to an anti-high temperature plugging agent, a preparation method and an application thereof. Background technique [0002] In the process of oil drilling, lost circulation often occurs, that is, the phenomenon that the drilling fluid in the wellbore leaks into the pores and fractures of the formation. Lost circulation is extremely harmful to drilling operations, leading to the loss of drilling fluid, prolonging the drilling cycle, and causing accidents such as block loss, drill sticking, and well wall collapse. Therefore, in order to ensure the normal progress of drilling operations, it is necessary to use a lost circulation agent to seal the formation where lost circulation occurs. [0003] Currently commonly used plugging agents mainly include physical plugging agents and chemical plugging agents. Physical plugging agents are solid particulate matter. The principl...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/44
Inventor 卢淑芹张艺馨郭吉清朱宽亮马艳姜薇李路宽
Owner PETROCHINA CO LTD
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