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Fluid loss agent for drilling fluid and preparation method thereof

A technology of fluid loss reducer and drilling fluid, which is applied in the field of oil and gas drilling, can solve the problems of limited well wall stability, easy failure of fluid loss reducer, failure to prevent collapse, etc., to increase drilling speed, increase rate and toughness Sex, reduce the effect of shear force

Pending Publication Date: 2020-08-18
河南省恒信阳光实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluid loss reducer in the drilling fluid can form a thin and dense flexible filter cake through low permeability to effectively prevent leakage, but with the increase of well depth, well pressure and temperature, etc., the fluid loss reducer is prone to failure
However, the flexible filter cake formed by the existing fluid loss reducer has poor effect at high temperature, has limited stabilizing effect on the well wall, and cannot play the role of preventing collapse.

Method used

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  • Fluid loss agent for drilling fluid and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] A fluid loss reducer for drilling fluid, prepared from the following materials in mass percentage: 54% starch grafted acrylamide, 13% calcium carbonate, 17% clay, 15% sodium alginate and 1% graphene oxide.

[0020] Starch-grafted acrylamide is prepared from the following materials in mass percentage: primary starch 20%, acrylic acid 14%, acrylamide 10%, N,N'-methylenebisacrylamide 0.4%, initiator 1.2%, and the remaining The amount is water, and the initiator is ammonium persulfate.

[0021] The preparation method of described drilling fluid fluid loss reducer, comprises the following steps:

[0022] (1) preparing starch grafted acrylamide;

[0023] (2) After mixing calcium carbonate and clay, pulverize and grind, the particle size after grinding is ≤0.150mm, and then mix evenly with the starch-grafted acrylamide prepared in step (1) to obtain a mixture;

[0024] (3) Mix sodium alginate and graphene oxide evenly, then add to the mixture in step (2), and finally stir an...

Embodiment 2

[0027] A fluid loss reducer for drilling fluid is prepared from the following materials in mass percentage: 59% starch grafted acrylamide, 10% calcium carbonate, 15% clay, 15% sodium alginate and 1% graphene oxide.

[0028] Starch-grafted acrylamide is prepared from the following materials by mass percentage: primary starch 25%, acrylic acid 15%, acrylamide 13%, N,N'-methylenebisacrylamide 0.6%, initiator 1.5%, and the remaining The amount is water, and the initiator is ammonium persulfate.

[0029] A preparation method of a fluid loss reducer for drilling fluid, comprising the following steps:

[0030] (1) preparing starch grafted acrylamide;

[0031] (2) After mixing calcium carbonate and clay, pulverize and grind, the particle size after grinding is ≤0.150mm, and then mix evenly with the starch-grafted acrylamide prepared in step (1) to obtain a mixture;

[0032] (3) Mix sodium alginate and graphene oxide evenly, then add to the mixture in step (2), and finally stir and m...

Embodiment 3

[0035] A fluid loss reducer for drilling fluid, prepared from the following materials in mass percentage: 67% starch grafted acrylamide, 10% calcium carbonate, 12% clay, 10.5% sodium alginate and 0.5% graphene oxide.

[0036] Starch-grafted acrylamide is prepared from the following materials by mass percentage: primary starch 23%, acrylic acid 12%, acrylamide 12%, N,N'-methylenebisacrylamide 0.5%, initiator 1.3%, and the remaining The amount is water, and the initiator is ammonium persulfate.

[0037] A preparation method of a fluid loss reducer for drilling fluid, comprising the following steps:

[0038] (1) preparing starch grafted acrylamide;

[0039] (2) After mixing calcium carbonate and clay, pulverize and grind, the particle size after grinding is ≤0.150mm, and then mix evenly with the starch-grafted acrylamide prepared in step (1) to obtain a mixture;

[0040] (3) Mix sodium alginate and graphene oxide evenly, then add to the mixture in step (2), and finally stir and...

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Abstract

The invention provides a fluid loss agent for drilling fluid and a preparation method thereof. The fluid loss agent is prepared from the following materials in percentage by mass: 54%-67% of starch grafted acrylamide, 10%-13% of calcium carbonate, 12%-17% of clay, 10%-15% of sodium alginate and 0.5%-1% of graphene oxide. The preparation method comprises the following steps: mixing calcium carbonate and clay, crushing and grinding until the particle size is less than or equal to 0.150 mm, uniformly mixing with starch grafted acrylamide to obtain a mixture; uniformly mixing sodium alginate and graphene oxide, then adding into the mixture, finally uniformly stirring and mixing. Low filtration loss (less than or equal to 8 mL) is maintained, and a tough filter cake is quickly formed on a permeation filter surface, so that a well wall can be well protected.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] Drilling fluid is the blood of oil and gas drilling, and its performance is crucial to oil and gas drilling efficiency, cost, environmental protection, and drilling safety. The fluid loss reducer in the drilling fluid can form a thin and dense flexible filter cake through low permeability to effectively prevent leakage, but with the increase of well depth, well pressure and temperature, the fluid loss reducer is prone to failure. However, the flexible filter cake formed by the existing fluid loss reducer has poor effect at high temperature, has limited stabilizing effect on the well wall, and cannot play the role of preventing collapse. Contents of the invention [0003] The invention proposes a fluid loss reducing agent for drilling fluid and a preparation meth...

Claims

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Application Information

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IPC IPC(8): C09K8/03C08F251/00C08F220/06C08F220/56C08F222/38
CPCC09K8/03C08F251/00C08F220/06C08F220/56C08F222/385
Inventor 徐光勇徐灿徐玉森姜文振
Owner 河南省恒信阳光实业有限公司