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Endogenous toughened corrosion-resistant cement mortar system

A cement slurry and toughening technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of low compressive strength of cement cement, poor corrosion resistance and impact resistance, and large carbon fiber aspect ratio. problem, to achieve the effect of adjustable density and thickening time, low cost, and reduced water loss

Active Publication Date: 2016-09-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the toughness of cement stone can be improved by adding plasma-modified carbon fiber, the aspect ratio of carbon fiber is large, the dispersion in cement slurry is poor, and the compatibility is not good, which leads to the compressive strength of cement stone. lower
In order to overcome the shortcomings of the existing toughening cement slurry system for well cementing, such as low strength, difficulty in large-scale application, poor corrosion resistance and impact resistance, etc., efforts have been made to make breakthroughs in the field of shale gas well cementing. Endogenous toughening and corrosion resistance The research value of cement slurry system is gradually emerging

Method used

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  • Endogenous toughened corrosion-resistant cement mortar system
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  • Endogenous toughened corrosion-resistant cement mortar system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Formula: 100 parts of high sulfate-resistant G grade oil well cement, 10 parts of microcrystalline calcium aluminate ferrite, 1 part of polyvinyl alcohol, 1 part of melamine formaldehyde resin, 2 parts of boric acid and 49 parts of water.

[0039] The clinker mineral composition of high sulfate-resistant G grade oil well cement is as follows:

[0040]

[0041] The proportions of raw materials required for the preparation of microcrystalline calcium aluminate ferrite and the preparation process are as follows:

[0042]

[0043] The raw materials required for the preparation of microcrystalline calcium aluminate ferrite were added into a ball mill jar, and the planetary ball mill was used to grind for 3.5 hours. The ground raw material is dried, and the dried raw material is compressed into tablets (the pressure is 45KN, the pressure increase rate is 0.1KN / s, the pressure is released after holding the pressure for 180s, and the pressure is ≤2.5KN when the pressure i...

Embodiment 2

[0045] Formula: 100 parts of high sulfate-resistant G grade oil well cement, 20 parts of microcrystalline calcium aluminate ferrite, 15 parts of microsilicon, 3 parts of polyacrylamide, 1 part of sodium hexametaphosphate, 0.5 parts of gypsum and 60 parts of water.

[0046] The composition and preparation of the high sulfate-resistant G grade oil well cement and microcrystalline calcium aluminoferrite are the same as those in Example 1.

Embodiment 3

[0048] Formula: 100 parts of high sulfate-resistant G grade oil well cement, 30 parts of microcrystalline calcium aluminate ferrite, 15 parts of micro silicon, 4 parts of carboxymethyl cellulose, 2 parts of sodium lignosulfonate, 2 parts of sodium borate and 64 parts of water share.

[0049] The composition and preparation of the high sulfate-resistant grade G oil well cement and microcrystalline calcium aluminoferrite are the same as in Example 1.

[0050] 2. Performance test of endogenous toughened and corrosion-resistant cement slurry system

[0051] Embodiment 1, Embodiment 2, and Embodiment 3 were respectively prepared according to the national standard GB / T 19139─2012 cement slurry, and measured the basic properties such as the density, fluidity and thickening time of the cement slurry, and the anti-corrosion properties before and after corrosion. compressive strength and flexural strength. The basic performance results of the endogenous toughened and corrosion-resista...

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Abstract

The invention discloses an endogenous toughened corrosion-resistant cement mortar system which is composed of the following components in parts by weight: 100 parts of high-sulfate-resistance Grade-G oil well cement, 5-35 parts of microcrystal calcium aluminoferrite, 0-25 parts of micro silicon, 1.0-4.5 parts of water-loss control agent, 0.5-3.0 parts of dispersing agent, 0.2-3.0 parts of thickening time control agent and 44-80 parts of water. The microcrystal calcium aluminoferrite is prepared by high-temperature calcination and shock cooling. The micro silicon is a density regulator. The water-loss control agent is polyvinyl alcohol, polyacrylamide or carboxymethyl cellulose. The dispersing agent is sodium hexametaphosphate, melamine formaldehyde resin, sodium lignosulfonate or methyl cellulose. The thickening time control agent is boric acid, gypsum, sodium borate or a mixture thereof. The endogenous toughened corrosion-resistant cement mortar system has the advantages of excellent impact resistance, higher compression strength, high volume stability and small changes of porosity and permeability, has important meanings for ensuring safe and efficient development of shale gas, and thus, has broad market prospects.

Description

technical field [0001] The invention relates to an endogenous toughened and corrosion-resistant cement slurry system, which is particularly suitable for well cementing operations requiring strict toughness and corrosion resistance of cement stones such as shale gas wells, ultra-deep wells and acid oil and gas wells. Background technique [0002] With the proposal of the National Thirteenth Five-Year Oil and Gas Strategic Plan, natural gas resources have become one of the important forms of energy for my country's national economic and social development, featuring high efficiency, environmental protection, and cleanliness. The world's total shale gas reserves are equivalent to the total reserves of conventional natural gas resources, and China's recoverable shale gas resources rank first in the world (about 36 trillion cubic meters, accounting for 20% of the world's total recoverable resources). If shale gas resources are efficiently and rationally utilized, it can well solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C09K8/467C04B111/20
CPCC04B28/04C04B2111/00724C04B2111/20C04B2111/2015C04B2201/20C04B2201/50C09K8/467C04B14/363C04B24/2623C04B24/305C04B22/0013C04B18/146C04B24/2652C04B22/16C04B22/143C04B24/383C04B24/18C04B24/006
Inventor 程小伟杨永胜郭小阳李早元刘开强梅开元吴清梅时宇曹艳
Owner SOUTHWEST PETROLEUM UNIV
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