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Chlorine-free fluid migration prevention early strength agent for oil well cement, and preparation method and application thereof

A technology of oil well cement and early strength agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of perforation casing damage, high Clˉ content in underground drinking water sources, shortening the service life of casing, etc. Effects of early compressive strength and cementitious strength, prolonging single well production life and shortening thickening time

Inactive Publication Date: 2017-04-05
CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Clˉ itself does not corrode the casing, but its existence accelerates the formation of Fe 3+ Ionization destroys the oxide film protective layer of the casing, forming pitting or pitting corrosion, which eventually leads to damage to the perforated casing and reduces the service life of the casing;
[0005] 2. If Clˉ exceeds the standard, the Clˉ content in underground drinking water sources will be too high, causing water pollution

Method used

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  • Chlorine-free fluid migration prevention early strength agent for oil well cement, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment provides a chlorine-free anti-channeling early strength agent for oil well cement, which is composed of the following mass percentages: coagulation accelerator 33-48%, expansion agent 20-25%, organic early strength agent 1-2%, The balance is filler.

[0022] The principle of the invention: the coagulant can accelerate the hydration process, thereby accelerating the hardening and coagulation of the cement slurry, and the expansion agent expands in volume when the cement sets and hardens, compensating for shrinkage and tensioning the steel bars to generate prestress and fully filling the cement gap The organic early strength agent mainly accelerates the low-temperature hydration coagulation speed of the cement slurry, and improves the early strength of the cement stone. The filler can fill the pores between the cement particles and form a gel with the hydration product. Effectively eliminate the incompatibility between cement materials and formation mud ca...

Embodiment 2

[0024] On the basis of Example 1, this example provides a chlorine-free anti-channeling early-strength agent for oil well cement, which is composed of the following mass percentages: coagulant 33%, expansion agent 20%, organic early-strength agent 1 %, the balance is filler.

[0025] Preparation process: Add sodium silicate, expansion agent, and organic early strength agent into the mixing tank according to the formula percentage, stir for 8-10 minutes, and let it stand for 30-40 minutes; then add the formula amount of calcium formate, sodium aluminate and filling material, and stirred for 10-15 minutes to prepare the chlorine-free anti-channeling early strength agent for oil well cement.

[0026] In this example, the coagulant is composed of 5% calcium formate, 8% sodium aluminate, and 20% sodium silicate, the expansion agent is barite, the organic early strength agent is ethylene glycol, and the filler is carbonic acid. calcium.

[0027] Calcium formate, sodium aluminate a...

Embodiment 3

[0029] On the basis of Example 1, this example provides a chlorine-free anti-channeling early-strength agent for oil well cement, which is composed of the following mass percentages: coagulation accelerator 44%, expansion agent 22%, organic early-strength agent 1.5% %, the balance is filler.

[0030] Preparation process: Add sodium silicate, expansion agent, and organic early strength agent into the mixing tank according to the formula percentage, stir for 8-10 minutes, and let it stand for 30-40 minutes (make the water contained in calcium oxide and triethanolamine fully exothermic and cool After that); then add the formula amount of calcium formate, sodium aluminate and filler in turn, and stir for 10-15 minutes to obtain the chlorine-free anti-channeling early strength agent for oil well cement. The obtained oil well cement chlorine-free anti-channeling early strength agent has a density of 2.36g / cm 3 .

[0031] In this example, the coagulant is composed of 8% calcium for...

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Abstract

The invention provides a chlorine-free fluid migration prevention early strength agent for oil well cement. The chlorine-free fluid migration prevention early strength agent comprises, by mass, 33-48% of a coagulation accelerator, 20-25% of an expanding agent, 1-2% of an organic early strength agent, and the balance of a filler. The chlorine-free fluid migration prevention early strength agent effectively improves the early strength of set cement, contains no chloride ions or other corrosive ions, has no corrosion effect on sleeves or the set cement, avoids catalytic corrosion of Cl<-> to the sleeves and pollution of the Cl<-> to an underground water source, prolongs the exploitation life of a single well, truly realizes harmlessness of cementing additives, greatly shortens the well cementation cement curing time, shortens the cement curing time, meets performance requirements of cement mortar and the set cement in well cementation construction process, effectively protects sleeves, protects oil and gas reservoirs, and improves the productivity of the single well.

Description

technical field [0001] The invention belongs to the technical field of oil field drilling and completion engineering, and in particular relates to a chlorine-free anti-channeling early strength agent for oil well cement, a preparation method and application thereof. Background technique [0002] The oil well cement early strength agent used in China is mostly CaCl 2 , KCl as the main material, compounded with various inorganic salts; this type of early strength is mainly used in the cementing of 1000-2500m oil and gas wells, which can shorten the thickening time, improve the early compressive strength of cement stone, and improve the solidification of the target layer. Well quality; however, the existence of Clˉ is not considered to accelerate the corrosion of the casing and the pollution of formation water, which reduces the production cycle and service life of a single well. [0003] With the in-depth implementation of the new environmental protection law, the country is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 常占宪魏周胜李波饶辰威张诚文汇博蒋敏雷庆锋
Owner CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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