Low-temperature high-early strength anti-migration agent for deep water cementing

A cementing and low-temperature technology, which is applied in the field of oilfield chemical agents and oil and gas well cementing, to achieve strong anti-channeling ability, shorten transition time, and ensure the effect of long-term mechanical property stability

Inactive Publication Date: 2008-12-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the problem of shallow water-air flow, shortening the "transition time" of the static gel strength of cement slurry from 48 to 240Pa is the key to preventing channeling, but there is no domestic report on admixtures that shorten the static gel strength of cement slurry , there are only a small number of reports abroad (such as US6,457,524, US6,955,220)

Method used

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  • Low-temperature high-early strength anti-migration agent for deep water cementing
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  • Low-temperature high-early strength anti-migration agent for deep water cementing

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Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1, the early-strength function of the low-temperature early-strength anti-channeling agent of the present invention

[0017] Add a certain mass percentage of the low-temperature early-strength anti-channeling agent of the present invention to Shengwei G-grade cement, prepare cement slurry according to GB10238-88 standard, the water-cement ratio is 0.44, and the cement slurry density is 1.92g / cm 3 . The compressive strength of the cement slurry at different curing temperatures was measured, and the evaluation results are shown in Table 1. The results show that the low-temperature early-strength anti-channeling agent of the present invention can significantly improve the compressive strength of G-grade oil well cement at low temperature, and the compressive strength increases more obviously when the temperature is lower. It shows that the low-temperature early-strength anti-channeling agent of the present invention has excellent low-temperature early-strength ...

Embodiment 2

[0020] Embodiment 2, the influence of the low-temperature early-strength anti-channeling agent of the present invention on the thickening time of cement slurry

[0021] Add a certain mass percentage of the low-temperature early-strength anti-channeling agent of the present invention to Shengwei G-grade cement, prepare cement slurry according to GB10238-88 standard, the water-cement ratio is 0.44, and the cement slurry density is 1.92g / cm 3 . The thickening time of cement slurry at different temperatures was measured, and the evaluation results are shown in Table 2. The results show that the low-temperature early-strength anti-channeling agent of the present invention can significantly shorten the thickening time of cement slurry, and the time of cement slurry from 30 to 100 Bc is also significantly shortened, showing a good "right-angle thickening" feature.

[0022] Table 2

[0023]

Embodiment 3

[0024] Embodiment 3, the influence of the low-temperature early-strength anti-channeling agent of the present invention on the static gel strength of cement slurry

[0025] Add a certain mass percentage of the low-temperature early-strength anti-channeling agent of the present invention to Shengwei G-grade cement, prepare cement slurry according to GB10238-88 standard, the water-cement ratio is 0.44, and the cement slurry density is 1.92g / cm 3 . It is a trend to evaluate the anti-channeling ability of cement slurry by static gel strength. It is generally believed that the shorter the "transition time" of static gel strength from 48 to 240Pa, the smaller the risk of channeling. Here, by measuring the static gel strength development of cement slurry at different temperatures, the "transition time" of the static gel strength from 48 to 240 Pa is calculated, and the evaluation results are shown in Table 3. The results show that adding the low-temperature early-strength anti-chann...

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Abstract

The invention provides a low temperature and early stiffening channeling-preventing agent for cementing wells in deep water and belongs to the field of oil field chemical agent and oil gas well cementing. The low temperature and early stiffening channeling-preventing agent of the invention consists of the following substances: 8 pbw (parts by weight) to 30 pbw of sodium aluminate, 35 pbw to 60 pbw of an alkali metal chloride salt and 12 pbw to 35 pbw of an oxygenated alkaline substance. Compared with the prior art, the low temperature and early stiffening channeling-preventing agent of the invention can obviously enhance the compression strength of hardened cement paste at the early stage and notably shorten 'transient time' of the static gel strength of cement paste from 48Pa to 240Pa, has excellent double functions of early stiffening at low temperature and channeling-preventing and no adverse influence on rheological characteristic of the cement paste and the long term compression strength of the hardened cement paste, and can meet the requirements of deep water well cementing operation under the conditions of low temperature, shallow seated groundwater and gas flowing.

Description

technical field [0001] The invention relates to a low-temperature early-strength anti-channeling agent for deep-water well cementing, which belongs to the field of oilfield chemical agents and oil-gas well cementing. The low-temperature early-strength anti-channeling agent can shorten the thickening time of cement slurry under the condition of deep water and low temperature, accelerate the development of static gel strength of cement slurry, and improve the early compressive strength of cement stone. It can be used for oil and natural gas solidification under low temperature conditions. In wells, it is especially suitable for deep water cementing with low temperature and shallow water-gas flow. Background technique [0002] Deep water refers to sea areas with a water depth of 500-1500m. The deep water area is rich in oil and gas resources, and it is the key area for future global oil strategy succession. my country's South China Sea and the waters near the Nansha Islands a...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C09K8/56
Inventor王瑞和王成文周卫东步玉环李靖
OwnerCHINA UNIV OF PETROLEUM (EAST CHINA)