Shearing responding gel plugging agent and preparation method and applications thereof

A technology of plugging agent and gel, which is applied in the field of shear-responsive gel plugging agent and its preparation, can solve the problems of fluid dilution, gravity sedimentation, and low gel strength of gel, and achieve weak gravity sedimentation , strong toughness, good anti-dilution effect of formation fluid

Active Publication Date: 2019-05-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems that the gel plugging agent in the prior art is prone to fluid dilution in the actual application process, and the g

Method used

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  • Shearing responding gel plugging agent and preparation method and applications thereof
  • Shearing responding gel plugging agent and preparation method and applications thereof
  • Shearing responding gel plugging agent and preparation method and applications thereof

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preparation example Construction

[0102] The second aspect of the present invention provides a method for preparing the above-mentioned shear-responsive gel plugging agent, comprising the following steps:

[0103] (1) adding the polymer complex monomer and the solid-phase organic macromolecular cross-linking agent into clear water, and stirring at the first stirring speed until completely dissolved to obtain the mixed solution a;

[0104] (II) adding the rheology modifier into the mixed solution a, stirring at the second stirring speed until uniformly dispersed, and obtaining the mixed solution b;

[0105] (III) Add the toughening agent into the mixed solution b, stir at the third stirring speed until uniformly dispersed, and obtain the mixed solution c;

[0106] (IV) Add the first initiator to the mixed solution c, stir at the fourth stirring speed until completely dissolved, and obtain the mixed solution d;

[0107] (V) sealing the mixed liquid d and standing still, and curing to form a gel, so as to obtain...

preparation example 1

[0123] (1) 5 g of acrylamide / methacrylic acid (mass ratio 3:1) mixed monomer and 0.1 g of ammonium persulfate were dissolved in 6 ml and 4 ml of deionized water, respectively, to obtain monomer solution A1 and initiator solution A2;

[0124] (2) Mix 9g of Span60 / Span80 (mass ratio 1:2) and 15g of Tween60 / Tween80 (mass ratio 2:1) and mix them with 60ml cyclohexane to obtain solution B

[0125] (3) Slowly add solution A1 dropwise to solution B, and stir to obtain solution C;

[0126] (4) Slowly add the solution A2 dropwise to the solution C and stir evenly, and after standing at 60° C. for 4 hours to react, the microemulsion D is obtained;

[0127] (5) Add 1.2 g of N-methylolacrylamide to microemulsion D, and adjust the pH to weakly acidic 4-5 to obtain microemulsion F;

[0128] (6) The microemulsion F was mixed with absolute ethanol to precipitate solid-phase substances, then repeatedly washed with acetone and dried for 5 hours to obtain a solid-phase organic macromolecular cr...

preparation example 2

[0130] (1) adding the polymer composite monomer and the solid-phase organic macromolecular cross-linking agent into clear water, and stirring at 700 rpm until it completely dissolves to obtain the mixed solution a;

[0131] (II) adding a rheology modifier into the mixed solution a, and stirring at 400 rpm until it is uniformly dispersed to obtain a mixed solution b;

[0132] (III) Add the toughening agent into the mixed solution b, and stir at 100 rpm until it is uniformly dispersed to obtain the mixed solution c;

[0133] (IV) Add the first initiator to the mixed solution c, stir until it is completely dissolved at 100 rpm to obtain the mixed solution d; seal the mixed solution d and place it at 80° C., and solidify into a gel to obtain Shear-responsive gel plugging agent, wherein the first initiator is an oxidation-reduction system composed of ammonium persulfate and sodium bisulfite, and the mass ratio of oxidizing agent to reducing agent is 0.9:1. .

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Abstract

The invention belongs to the field of leak stopping of using a drilling fluid, and discloses a shearing responding gel plugging agent, which comprises a polymer composite monomer, a solid organic macromolecular crosslinking agent, a first initiator, a rheological regulating agent, and a flexibilizer. The invention also discloses a preparation method of the gel plugging agent. The preparation method comprises following steps: (I) adding the polymer composite monomer and the solid organic macromolecular crosslinking agent into clean water, and stirring to obtain a mixed solution (a); (II) addingthe rheological regulating agent into the mixed solution (a), and stirring to obtain a mixed solution (b); (III) adding the flexibilizer into the mixed solution (b), and stirring to obtain a mixed solution (c); (IV) adding the first initiator into the mixed solution (c), and stirring to obtain a mixed solution (d); and (V) sealing the mixed solution (d), and allowing the mixed solution (d) to stand still to carry out curing and gelling to obtain the shearing responding gel plugging agent. The gel plugging agent has the characteristics of proper shearing responding property, anti-diluting performance, and gelling strength, and has weak gravity settling phenomenon.

Description

technical field [0001] The invention relates to the field of drilling fluid plugging, in particular to a shear-responsive gel plugging agent and its preparation method and application. Background technique [0002] Lost circulation is one of the most common downhole complex problems in the drilling process at present. It directly reduces the drilling speed and increases the drilling cost. Lost circulation may occur in different types of formations, among which, carbonate reservoirs (developed with fractures and caves) have the most serious loss and are also the most difficult to solve. [0003] Gel plugging technology is one of the commonly used and effective technologies for controlling fractured and malignant lost circulation. This technology injects a certain amount of gel plugging agent solution into the lost layer, and seals the fracture after solidification to isolate the drilling fluid. interaction with formation fluids. Among them, the performance of the gel pluggi...

Claims

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Application Information

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IPC IPC(8): C09K8/467C08F265/10C08F220/56C08F220/58
Inventor 白英睿孙金声吕开河黄贤斌刘敬平王金堂
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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