The Performance of Set Aluminate Cement Modified by Micro Silica Compounded Sodium Hexametaphosphate under Condition of Shale Oil In-situ Conversion

WAN Xiangchen; ZHANG Jian; WANG Wenbin

doi:10.12358/j.issn.1001-5620.2023.05.014

Volume 40 Issue 5

Dec. 2023

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WAN Xiangchen, ZHANG Jian, WANG Wenbin.The performance of set aluminate cement modified by micro silica compounded sodium hexametaphosphate under condition of shale oil in-situ conversion[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：644-651 doi: 10.12358/j.issn.1001-5620.2023.05.014

Citation:

WAN Xiangchen, ZHANG Jian, WANG Wenbin.The performance of set aluminate cement modified by micro silica compounded sodium hexametaphosphate under condition of shale oil in-situ conversion[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：644-651 doi: 10.12358/j.issn.1001-5620.2023.05.014

Citation:

WAN Xiangchen, ZHANG Jian, WANG Wenbin.The performance of set aluminate cement modified by micro silica compounded sodium hexametaphosphate under condition of shale oil in-situ conversion[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：644-651 doi: 10.12358/j.issn.1001-5620.2023.05.014

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The Performance of Set Aluminate Cement Modified by Micro Silica Compounded Sodium Hexametaphosphate under Condition of Shale Oil In-situ Conversion

doi: 10.12358/j.issn.1001-5620.2023.05.014

WAN Xiangchen^{1, 2
,
,},
ZHANG Jian^{1, 2},
WANG Wenbin^{1, 2}

1.
Drilling & Production Engineering Technology Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Xi’an, Shaanxi 710018
2.
National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an, Shaanxi 710018

Received Date: 2023-04-18
Rev Recd Date: 2023-06-02
Publish Date: 2023-12-25

Abstract

Abstract

In the in-situ conversion of low purity shale oils, extremely high temperature will result in strength retrogression of the set cement. To solve this problem, study was conducted on the macro-properties and microstructures of an aluminate cement before and after aging 650 ℃. The aluminate cement is a cement modified by micro silica compounded sodium hexametaphosphate. It is found that at 50 ℃, sodium hexametaphosphate can significantly reduce the permeability of a set aluminate cement, and the compressive strength of the set cement is significantly increased. After treatment at 650 ℃, the aluminate cement modified with 5.0% sodium hexametaphosphate has the highest compressive strength, which is 47.19 MPa, while the aluminate cement modified with micro silica compounded sodium hexametaphosphate has strengths that are declining. The hydrational products of the aluminate cement before and after treatment at 650 ℃ have experienced significant changes, from C₃AH₆ and AH₃ to C₁₂A₇ and CA, respectively. Among these products, C₃AH₆ and AH₃ are thermally degraded in temperatures between 180 ℃ and 400 ℃, and because of the changes of the crystal form, the permeability of the set cement is increased. Micro silica accelerates the formation of C₂ASH₈ by the set cement at 50 ℃, and this is beneficial to the improvement of the microstructure of the set cement. Since C₂ASH₈ will degrade after treatment at 650 ℃, the sizes of the pores in the set cement will also increase.
- In-situ conversion of shale oil,
- Aluminate cement,
- Sodium hexametaphosphate,
- Micro silica powder,
- High temperature treatment,
- Hydration product

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References(23)

References

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The Performance of Set Aluminate Cement Modified by Micro Silica Compounded Sodium Hexametaphosphate under Condition of Shale Oil In-situ Conversion

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