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Well cementing rubber stopper preparation method

A rubber plug and cementing technology, which is applied in the field of preparation of rubber plugs for cementing, can solve problems such as easy aging of cementing rubber, and achieve the effects of shortening plasticizing time, large compression resilience, and improving strength and stiffness.

Inactive Publication Date: 2016-01-20
成都棕通石油配件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the current cementing rubber is easy to age and needs to be replaced frequently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of preparation method of rubber plug for well cementing is characterized in that, comprises the following steps:

[0019] a. Modification of lignocellulosic short fibers: mixing lignocellulose short fibers and malonic acid at a mass ratio of (45-50): 1, and heating and modifying to obtain modified lignocellulosic short fibers;

[0020] The temperature of heating modification is 50~60℃, and the time is 15~18min;

[0021] b. Dry the natural rubber NR in a drying room at 60~70°C to soften, then cut and break the rubber into small pieces to obtain raw rubber;

[0022] c. Put the raw rubber obtained in step b into a double-roll mill, and then add the modified lignocellulose short fibers obtained in step a, fine particle calcium carbonate, zinc oxide, magnesium oxide, accelerator DM, and anti-aging agent NBC , rubber peptizer and vulcanizing agent BP, carry out mixing, obtain mixture A;

[0023] d. Put the mixture A obtained in step c into a mold, heat and form it, a...

Embodiment 2

[0025] A kind of preparation method of rubber plug for well cementing is characterized in that, comprises the following steps:

[0026] a. Lignocellulosic short fiber modification: the lignocellulose short fiber and malonic acid are mixed according to the mass ratio of (50-55): 1, and heat modification is performed to obtain the modified lignocellulosic short fiber;

[0027] The temperature of heating modification is 60~70℃, and the time is 18~20min;

[0028] b. Dry the natural rubber NR in a drying room at 60~65°C to soften, then cut and break the rubber into small pieces to obtain raw rubber;

[0029] c. Put the raw rubber obtained in step b into a double-roll mill, and then add the modified lignocellulose short fibers obtained in step a, fine particle calcium carbonate, zinc oxide, magnesium oxide, accelerator DM, and anti-aging agent NBC , rubber peptizer and vulcanizing agent BP, carry out mixing, obtain mixture A;

[0030] d. Put the mixture A obtained in step c into a...

Embodiment 3

[0032] A kind of preparation method of rubber plug for well cementing is characterized in that, comprises the following steps:

[0033] a. Modification of lignocellulose short fibers: mixing lignocellulose short fibers and malonic acid in a mass ratio of 45:1, and heating and modifying to obtain modified lignocellulose short fibers;

[0034] The temperature of heating modification is 50~70℃, and the time is 15~20min;

[0035] b. Dry the natural rubber NR in a drying room at 65~70°C to soften, then cut and break the rubber into small pieces to obtain raw rubber;

[0036] c. Put the raw rubber obtained in step b into a double-roller mill, and then add the modified lignocellulose short fibers obtained in step a, fine particle calcium carbonate, zinc oxide, magnesium oxide, accelerator DM, and anti-aging agent NBC , rubber peptizer and vulcanizing agent BP, carry out mixing, obtain mixture A;

[0037] d. Put the mixture A obtained in step c into a mold, heat and form it, and obt...

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PUM

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Abstract

The present invention provides a well cementing rubber stopper preparation method, and belongs to the field of rubber product production. In order to solve the problems of easy aging and requirement of frequent replacement of the existing well cementing rubber, the present invention provides a well cementing rubber stopper preparation method, which comprises: modifying lignocelluloses short fibers with malonic acid, preparing a raw rubber, mixing, and carrying out heating molding. According to the present invention, the raw rubber, the modified lignocelluloses short fibers, fine particle calcium carbonate, zinc oxide, magnesium oxide, an accelerator DM, an anti-aging agent NBC, a rubber peptizer and a vulcanizing agent BP are sequentially added to a twin-roller roll mill to carry out mixing, and the prepared rubber product has characteristics of high strength, low creep, high compression resilience, good sealing property, excellent oil resistance and excellent aging resistance, can be widely used in the cementing head in the petroleum drilling and extracting, and provides the effect of separation of different liquids in the well cementing operation.

Description

technical field [0001] The invention belongs to the field of rubber product preparation, and in particular relates to a preparation method of a rubber plug for well cementing. Background technique [0002] Cementing is an important operation in the drilling process. In drilling operations, there are generally at least two cementings (production wells), and up to 4 to 5 cementings (deep exploration wells). The top cementing is the surface casing cementing, which plays the role of "mud passage, oil and gas portal". Before the next spud, a blowout preventer should be installed on the surface casing to prevent blowout. A mud conduit should be installed above the blowout preventer, which is the passage for the drilling fluid to return to the mud pool. During the drilling process, technical casing cementing is often required, which plays the role of "consolidating the rear and exploring the road safely". Like highway tunnels and roadways in coal mines, well collapse, high pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L97/02C08K13/02C08K3/26C08K3/22C08K5/47C08H7/00B29C51/46
Inventor 祈琪黄明
Owner 成都棕通石油配件有限公司
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