A kind of micro-expansion toughened cement slurry and preparation method thereof

A cement slurry and micro-expansion technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that cannot meet the needs of cementing operations, and the ductile cement system has a large fluid loss, and achieves significant environmental protection advantages, solid The effect of excellent well quality and low fluid loss

Active Publication Date: 2020-07-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fluid loss of this ductile cement system is large, which cannot meet the needs of cementing operations.

Method used

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  • A kind of micro-expansion toughened cement slurry and preparation method thereof
  • A kind of micro-expansion toughened cement slurry and preparation method thereof
  • A kind of micro-expansion toughened cement slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The micro-expansion toughened cement slurry of this embodiment is composed of the following components in parts by weight: 100 parts of oil well cement, 8 parts of latex, 2 parts of fluid loss reducer, 1 part of drag reducer, 1 part of early strength agent, and 4 parts of expansion agent parts, 0.2 parts of defoamer, 40 parts of water.

[0041] The preparation method of the micro-expansion toughened cement slurry of the present embodiment comprises the following steps:

[0042] 1) Preparation of mixture A:

[0043] Take the formulated amount of fluid loss reducer, drag reducer, early strength agent and oil well cement, and mix them with an oil well cement dry mixing device at room temperature for 5 minutes to obtain mixture A;

[0044] 2) Preparation of mixture B:

[0045] At room temperature, pour the formulated amount of water into a water tank with a stirrer, then add the formulated amount of latex and defoamer while stirring, and continue stirring for 5 minutes at...

Embodiment 2

[0048] The micro-expansion toughened cement slurry of this embodiment is composed of the following components by weight: 100 parts of oil well cement, 10 parts of latex, 1.5 parts of fluid loss reducer, 1 part of drag reducer, 1.5 parts of early strength agent, and 2 parts of expansion agent. parts, 0.2 parts of defoamer, 40 parts of water.

[0049] The preparation method of the micro-expansion toughened cement slurry of the present embodiment comprises the following steps:

[0050] 1) Preparation of mixture A

[0051] Take the formulated amount of fluid loss reducer, drag reducer, early strength agent and oil well cement, and mix them with an oil well cement dry mixing device for 3 minutes at room temperature to obtain mixture A;

[0052] 2) Preparation of mixture B

[0053] At room temperature, pour the prescribed amount of water into a water tank with a stirrer, then add the prescribed amount of latex and defoamer while stirring, and continue stirring for 15 minutes at a ...

Embodiment 3

[0056] The micro-expansion toughened cement slurry of this embodiment is composed of the following components by weight: 100 parts of oil well cement, 12 parts of latex, 1 part of fluid loss reducer, 1.2 parts of drag reducer, 2 parts of early strength agent, and 3 parts of expansion agent. parts, 0.3 parts of defoamer, 40 parts of water.

[0057] The preparation method of the micro-expansion toughened cement slurry of the present embodiment comprises the following steps:

[0058] 1) Preparation of mixture A

[0059] Take the formulated amount of fluid loss reducer, drag reducer, early strength agent and oil well cement, and mix them with an oil well cement dry mixing device at room temperature for 4 minutes to obtain mixture A;

[0060] 2) Preparation of mixture B

[0061] At room temperature, pour the formulated amount of water into a water tank with a stirrer, then add the formulated amount of latex and defoamer while stirring, and continue stirring for 10 minutes at a ro...

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Abstract

The invention discloses a micro-expanded toughening slurry and a preparation method thereof. The micro-expanded toughening slurry is prepared from, by weight, 100 parts of oil well cement, 8-15 parts of latex, 1-2 parts of fluid loss agent, 1-1.5 parts of drag reduction agent, 1-2 parts of early strength agent, 2-4 parts of expanding agent, 0.2-0.5 part of defoaming agent and 40 parts of water. The micro-expanded toughening slurry has ultra-low filter loss and meanwhile has the advantages of good toughness, good rheological property, unshrinking volume, high early strength and the like. By adopting the micro-expanded toughening slurry, construction is simple, the technical advantage and the environmental protection advantage are remarkable, and the on-site-implemented well-cementing quality is high.

Description

technical field [0001] The invention relates to the field of drilling and cementing engineering, in particular to a micro-expansion toughened cement slurry and a preparation method thereof. Background technique [0002] In the old area of ​​Henan Oilfield, due to the damage of the old well casing and the scrapping of the old well, the layout of the oil-water well network is unreasonable, which seriously affects the exploitation of the remaining oil. Using the casing window sidetracking technology to conduct window sidetracking for abandoned wells, casing damaged wells, and low-efficiency wells can improve the injection-production well pattern, improve the recovery rate, and realize the improvement of comprehensive economic benefits. [0003] In order to meet technical requirements such as perforation in the later stage, Φ95.25mm non-standard casing is currently used as the production casing for the windowed well in Henan Oilfield; while the annular gap between the casing and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C09K8/467
CPCC04B28/00C04B2111/00724C09K8/467C04B24/2611C04B2103/46C04B24/226C04B2103/0068C04B2103/50
Inventor 郭进忠赵林王海娟曾欣陈平仝继昌
Owner CHINA PETROLEUM & CHEM CORP
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