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Low-hydration-heat early-strength cement for well cementation

An early-strength cement and cementing technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of shortening the well construction period, instability of permafrost or deep-water hydrate layer, cementing gas channeling, etc. problems, to achieve the effects of improved stability and compactness, excellent anti-gas channeling ability, and short thickening transition time

Inactive Publication Date: 2012-11-28
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When cementing in deep water, low-temperature coagulation accelerators must be added to the cement slurry to reduce the waiting time for setting and shorten the well construction period. It may lead to thermal decomposition of hydrate in the hydrate layer, affecting the overall sealing and cementing quality of the cement sheath, and threatening the safety of the drilling platform
Therefore, conventional cement is not suitable for deep water hydrate layer cementing
[0004] Moreover, the current early-strength cement slurry used in oil drilling has the defects of large hydration heat release and rapid heat release. During the cement slurry waiting period, the temperature of the annulus rises too high, causing permafrost or deep-water hydrate-bearing layers. Stable, leading to serious consequences such as cementing gas channeling and well kicking

Method used

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  • Low-hydration-heat early-strength cement for well cementation
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  • Low-hydration-heat early-strength cement for well cementation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: The formulation of early-strength cement with low heat of hydration of the present invention and performance evaluation of heat of hydration:

[0028] Cement component A: 60% of low-temperature early-strength cement, 25% of pozzolanic materials, and 15% of fine spherical particles.

[0029] Cement component B: 40% of low-temperature early-strength cement, 40% of pozzolanic materials, and 20% of fine spherical particles.

[0030] According to GB / T 12959-2008 "Method for Determination of Heat of Hydration of Cement", the hydration heat of cement with different formulations was tested, and compared with G-grade cement and low-temperature early-strength cement, the results are as follows.

[0031] Table 1

[0032]

[0033] It can be seen that after adding low heat of hydration materials, the heat of hydration of cement is greatly reduced, and the heat of hydration of cement component B is 51% of that of low-temperature early-strength cement, but its streng...

Embodiment 2

[0034] Embodiment 2: Low hydration heat cement slurry formula 1

[0035] Cement slurry formula 1: remaining cement component A + 20% hollow microspheres + 52% water + 1% sodium silicate + 0.5 retarder, cement slurry density: 1.5g / cm 3 .

[0036] The cement slurry was prepared and the performance of the cement slurry was tested with reference to the petroleum and natural gas industry standard ISO 10426-3-2003 "Cement and Materials for Oil Well Cementing Part 3: Deep Water Well Cement Formulation Test". The properties of cement paste are shown in Table 2.

[0037] Table 2

[0038]

Embodiment 3

[0039] Embodiment 3: low hydration hot water slurry formula 2

[0040] Cement slurry formula 2: remaining cement component B + 30% hollow microspheres + 62% water + 1.2% sodium silicate + 0.4 retarder, cement slurry density: 1.35g / cm 3 .

[0041] The performance of cement slurry is shown in Table 3

[0042] table 3

[0043]

[0044]The heat of hydration of the cement of the present invention is only 1 / 2 of that of conventional cement, and the low-temperature strength develops rapidly, so cement slurry with low heat of hydration can be prepared, and the technical effect of being used for cementing wells in hydrate-containing layers is as follows:

[0045] 1. The early-strength cement with low heat of hydration for well cementing of the present invention develops strength rapidly at low temperature, and the heat of hydration is about 1 / 2 of that of conventional low-temperature early-strength cement. The temperature of the cement slurry is lowered during the waiting time, a...

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Abstract

The invention relates to low-hydration-heat early-strength cement for well cementation, which is used in permafrost horizon or deepwater hydrate-bearing strata in oil drilling engineering. The cement disclosed herein comprises the following ingredients: 30-70wt% of low-temperature early-strength cement, 20-50wt% of pozzolanic material, and 10-40wt% of fine spherical particles. According to the invention, the hydration heat of the cement disclosed herein is 1 / 2 of that of ordinary cement, the low temperature strength develops fast; and the cement disclosed herein can be prepared into low-hydration-heat cement mortar, and has good effect and wide application.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering materials, in particular to a low-heat-of-hydration early-strength cement used for preparing permafrost or deep-water hydrate formations. Background technique [0002] With the continuous expansion of exploration and development of oil resources, the current exploration areas have developed into deep sea and cold areas. The exploration and development of deepwater oil and gas resources will inevitably encounter hydrate formations. Natural gas hydrate exists under low temperature and high pressure conditions. It can only exist at a temperature of 0-10°C and a pressure above 10 MPa. It generally exists in deep seas with water depths greater than 300m, and may also exist in permafrost formations. The average composition of natural gas hydrate is 1 mole of natural gas per 5.75 moles of water, with a density of 0.9 g / cm3. Under the conditions of pressure 1 MPa and temperature 0 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
Inventor 席方柱吕光明高永会谭文礼熊钰丹王翀孙富全
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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