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Modified polybenzimidazole fiber reinforcement cement paste system

A polybenzimidazole and benzimidazole technology, applied in the fiber type, fiber treatment, ultrasonic/sonic fiber treatment and other directions, can solve the problems of fiber toughening effect failure, difficult comprehensive performance, poor compatibility with cement slurry, etc. The effect of improved mechanical properties, good bonding degree and good construction performance

Active Publication Date: 2018-11-13
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the toughening agents for cement stone mainly include latex, rubber particles and fibers, etc. The disadvantage of latex is that the comprehensive performance is difficult to adjust; the disadvantage of rubber particles is that it has poor compatibility with cement slurry; the disadvantage of fibers is that the commonly used polypropylene Fiber and cellulose fiber have poor temperature resistance, and the toughening effect of the fiber will fail when used in high-temperature wells; while carbon fiber, etc. have poor dispersion in cement slurry, which is not conducive to exerting the toughening effect
Li Ming of Southwest Petroleum University and others added carbon fiber to cement slurry (Li Ming, Yang Yujia, Guo Xiaoyang. Mechanical properties of carbon fiber reinforced oil well cement[J]. Journal of Composite Materials, 2015,32(3):782-788 ), this method improves the toughness of cement stone, but does not completely solve the problem of carbon fiber dispersion in cement slurry
Li Ming and others also added brucite fiber to the cement slurry (Li Ming, Yang Yujia, Jin Jianzhou, et al. The enhancement effect and mechanism of brucite fiber on the mechanical properties of cement stone[J]. Natural Gas Industry, 2015,35(6):82-86), this method also improves the mechanical properties of cement stone, but the improvement effect of brucite fiber on the mechanical properties of cement stone is limited
Therefore, the current research focuses on how to improve the existing fiber tougheners such as poor dispersion effect and poor temperature resistance.

Method used

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  • Modified polybenzimidazole fiber reinforcement cement paste system
  • Modified polybenzimidazole fiber reinforcement cement paste system
  • Modified polybenzimidazole fiber reinforcement cement paste system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 (blank cement slurry system)

[0030] Formula: 100 parts of high sulfate-resistant grade G oil well cement, 0.5 parts of sodium polystyrene sulfonate, 1.0 parts of polyvinylpyrrolidone, 0.2 parts of sodium gluconate and 40 parts of water.

[0031] The mineral components of high sulfate-resistant grade G oil well cement are shown in Table 1.

[0032] Table 1 Mineral components of high sulfate-resistant grade G oil well cement

[0033]

Embodiment 2

[0035] Formula: 100 parts of high sulfate-resistant grade G oil well cement, 0.8 parts of modified polybenzimidazole fiber, 0.5 parts of sodium polystyrene sulfonate, 1.0 part of polyvinylpyrrolidone, 0.2 parts of sodium gluconate and 40 parts of water.

[0036] The composition of the high sulfate-resistant type G grade oil well cement is the same as in Example 1.

[0037] The process of preparing modified polybenzimidazole fiber is as follows:

[0038] 1) Chopping polybenzimidazole fibers to obtain chopped polybenzimidazole fibers with an average length of 300 μm; 2) adding chopped polybenzimidazole fibers to a beaker, and then weighing 97% concentrated nitric acid Measure 200mL into the beaker, stir well, seal it with plastic wrap and tie it tightly with a rubber band. Put the beaker into the water bath and fix it. The heating temperature of the water bath is 60° C., and the constant temperature heating treatment is carried out for 3 hours. After the treatment, take out th...

Embodiment 3

[0040] Formula: 100 parts of high sulfate-resistant grade G oil well cement, 1.5 parts of modified polybenzimidazole fiber, 0.6 parts of polynaphthalene sodium sulfonate, 1.5 parts of hydroxyethyl cellulose, 0.3 parts of sodium borate and 44 parts of water.

[0041] The composition of the high sulfate-resistant type G grade oil well cement is the same as in Example 1. The composition and preparation of the modified polybenzimidazole fiber are the same as in Example 2.

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Abstract

The invention discloses a modified polybenzimidazole fiber reinforcement cement paste system. The system comprises the following components in parts by weight: 100 parts of high sulfate resistance grade-G oil well cement, 0.2 to 3.0 parts of modified polybenzimidazole fiber, 0 to 40 pars of quartz sand, 0.5 to 2.5 parts of a dispersant, 1.0 to 6.0 parts of a fluid loss agent, 0.2 to 3.0 parts of aretarder, and 38 to 70 parts of water. The modified polybenzimidazole fiber is performed by performing surface modification on the polybenzimidazole fiber as follows: firstly, performing oxidation treatment on the polybenzimidazole fiber, then, performing low temperature plasma treatment on the polybenzimidazole fiber, and finally, performing coupling treatment on the polybenzimidazole fiber. Feinforcement cement paste has the characteristics of high tensile strength, breaking strength and low elasticity modulus, the modified polybenzimidazole fiber is high in temperature resistance capacityand good in dispersibility in cement paste, set cement is excellent in mechanical property, and the system has important application value for improving the cementing quality of high temperature deepwells and shale gas wells.

Description

technical field [0001] The invention relates to a modified polybenzimidazole fiber toughened cement slurry system, which belongs to the field of petroleum and natural gas exploration and development, and is suitable for the cementing operation of oil and gas wells with high requirements on the mechanical properties of the cement sheath. Background technique [0002] In the cementing of oil and gas wells, the cement slurry is injected into the casing or the annular space between the casing and the well wall to solidify and harden to form a cement sheath. The cement sheath plays the role of supporting the casing and isolating the underground fluid. Since cement stone is a brittle material with very low tensile strength, it is easy to be brittle to form micro-cracks and micro-annulus during pressure testing, perforating, mining, fracturing and other operations, resulting in the failure of the cement sheath. Therefore, it is very important to add toughening materials to cement s...

Claims

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Application Information

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IPC IPC(8): C04B28/06C09K8/467D06M11/64D06M10/02D06M13/513D06M101/30
CPCC09K8/467D06M10/025D06M11/64D06M13/513C04B28/06C04B2201/50D06M2101/30C04B7/02C04B24/163C04B24/2652C04B24/10C04B16/0675C04B24/383C04B22/08
Inventor 于永金李明靳建洲徐明齐奉忠张弛张华刘子帅刘慧婷冯宇思
Owner BC P INC CHINA NAT PETROLEUM CORP
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