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Well cementation cement paste with high water-cement ratio, low cost and low density and preparation method thereof

A cementing cement slurry, low-cost technology, applied in the direction of chemical instruments and methods, drilling composition, etc., to achieve high proportion, reduce micro-annulus, and adjustable thickening time

Inactive Publication Date: 2019-03-08
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in order to improve the stability of the slurry under the condition of high water-cement ratio, micro-silicon with a smaller particle size is added to improve the suspension characteristics, forming a ternary system of fly ash-micro-silicon-oil well cement. However, the existing pulverized coal None of the gray activators can make the 1.30-1.35g / cm2 under the condition of high water-cement ratio 3 Density cement slurry strength meets the requirements of cementing industry with high temperature and high pressure (such as 60℃×25MPa) for 24 hours, and normal temperature and pressure for 72 hours. The curing strength is above 3.5MPa.

Method used

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  • Well cementation cement paste with high water-cement ratio, low cost and low density and preparation method thereof
  • Well cementation cement paste with high water-cement ratio, low cost and low density and preparation method thereof
  • Well cementation cement paste with high water-cement ratio, low cost and low density and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. A cement slurry with high water-cement ratio, low cost and low density, consisting of the following raw materials in parts by weight: 100 parts of G grade oil well cement, 25 parts of fly ash, 30 parts of microsilica fume, 2 parts of early strength agent, 2 parts of ternary activators, 3 parts of dehydration reducing agent, 0.2 part of defoamer, 223 parts of clear water, wherein, said ternary activator is a mixture of soda lime and magnesium sulfate with a mass ratio of 9:1, said Both soda lime and magnesium sulfate pass through a 100-mesh sieve;

[0034] The fly ash is Class F fly ash specified in GB / T 1596-2017;

[0035] The average particle size of the micro-silicon powder is 0.1-0.3 μm, and the specific surface area is 22-28m 2 / g;

[0036] The early strength agent is an inorganic salt early strength agent;

[0037] The fluid loss reducer is a water-soluble polymer fluid loss reducer;

[0038] The defoamer is a phosphate defoamer;

[0039] 2. the preparation...

Embodiment 2

[0044] 1. A cement slurry with high water-cement ratio, low cost and low density, consisting of the following raw materials in parts by weight: 40 parts of G grade oil well cement, 60 parts of fly ash, 30 parts of microsilica fume, 2 parts of early strength agent, 6 parts of ternary activators, 3 parts of water loss reducer, 0.2 part of dispersant, 0.2 part of defoamer, 195 parts of clear water, wherein the ternary activator is soda lime and magnesium sulfate with a mass ratio of 9:1 The mixture, the soda lime and magnesium sulfate all pass through 100 mesh sieves;

[0045] Described fly ash, microsilica fume, early strength agent, fluid loss reducer, defoamer are the same as embodiment 1;

[0046] The dispersant is sulfonated acetone formaldehyde condensation polymer;

[0047] 2. the preparation method of described high water-cement ratio low-cost low-density well cementing cement slurry, comprises the following steps:

[0048] (1) Combine oil well cement, fly ash, microsilic...

Embodiment 3

[0052] 1. A cement slurry with high water-cement ratio, low cost and low density, consisting of the following raw materials in parts by weight: 40 parts of G grade oil well cement, 60 parts of fly ash, 30 parts of microsilica fume, 2 parts of early strength agent, 8 parts of ternary activator, 3 parts of water loss reducer, 0.2 part of dispersant, 0.2 part of defoamer, 195 parts of clear water, wherein the ternary activator is soda lime and magnesium sulfate with a mass ratio of 9:1 The mixture, the soda lime and magnesium sulfate all pass through 100 mesh sieves;

[0053] Described fly ash, microsilica fume, early strength agent, water loss reducing agent, defoamer, dispersant are the same as embodiment 2;

[0054] 2. The method for preparing the cement slurry with high water-cement ratio, low cost and low density is the same as in Example 2.

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Abstract

The invention discloses well cementation cement paste with a high water-cement ratio, low cost and a low density. The well cementation cement paste is prepared from the following raw materials in parts by weight: 40 to 100 parts of oil well cement, 25 to 60 parts of coal ash, 30 to 40 parts of silica fume, 2 to 3 parts of an early strength agent, 2 to 8 parts of a ternary exciting agent, 3 to 3.5parts of a fluid loss agent, 0 to 0.2 part of a dispersing agent, 0.2 part of a defoaming agent and 180 to 272 parts of clean water, wherein the ternary exciting agent is a mixture of soda lime and magnesium sulfate, the mass ratio of the soda lime to the magnesium sulfate is 9 to 1, and the soda lime and the magnesium sulfate are both sieved by a 100-mesh sieve. Meanwhile, the invention further discloses a preparation method of the well cementation cement paste preparation method. The well cementation cement paste has low cost; after the ternary exciting agent is added, the compressive strength is improved, and a requirement of well cementation for the strength of low-density cement paste is met; furthermore, expansibility is improved, cement paste micro annular spaces caused by the inherent shrinkage character are reduced, and the risk of poor wellhole sealing safety is reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well cementing engineering, and in particular relates to a high water-cement ratio low-cost low-density well cementing cement slurry and a preparation method thereof. Background technique [0002] Low-density cement slurry is widely used in the cementing of various low-pressure oil and gas wells that are prone to leakage. Taking the Ordos Basin as an example, because there are many weak formations from top to bottom, more than 90% of the wells need to use low-density cement slurry for cementing. A lot of research has been done on low-density cement slurry at home and abroad, and a series of excellent density-reducing materials such as artificial microbeads and floating beads have been selected, and good results have also been achieved. However, as the international oil price has continued to hover at the middle and low levels in recent years, the pressure to reduce costs and increase efficienc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C09K8/467
CPCC04B28/00C04B2201/20C04B2201/50C09K8/467C04B18/08C04B18/146C04B2103/12C04B22/064C04B22/142C04B24/24C04B2103/50
Inventor 王涛吴金桥李伟杨洪于小龙杨超段玉秀展转盈杨先伦燕迎飞侯云翌王波
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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