BFS oil well cement

An oil well cement and clinker technology, which is applied in the field of BFS oil well cement and its preparation, can solve the problems of poor corrosion resistance, late strength decline, and low cementing quality rate, and achieve good compatibility and good effect.

Inactive Publication Date: 2015-06-17
BAODING BAOXING OIL FIELD CEMENTING MATERIAL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention: a large amount of G-grade oil well cement is used in the oil field for cementing construction, but there is always a problem that the cementing quality is not high and the high-quality rate is not high
The main reason is that the poor compatibility between G grade oil well cement and drilling mud leads to insufficient local bonding strength, poor seismic toughness of cement stone, late strength decline, poor corrosion resistance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A BFS oil well cement comprises BFS and clinker, and the weight ratio of the BFS to clinker is 20:100-40:100.

[0037] Described BFS is made up of the raw material of following percentage by weight: CaO 38~46%, SiO 2 36-42%, Al 2 o 3 7~20%, MgO 4~13%, Fe 2 o 3 0.2~1%, MnO 0.1~1%, SO 3 1 to 5%.

[0038] The clinker is composed of the following raw materials in weight percentage: CaO 61-64%, SiO 2 20-23%, Al 2 o 3 3~6%, MgO 1~3%, Fe 2 o 3 3-6%, SO 3 3%.

[0039] Mix BFS and clinker at a ratio of 20:100-40:100, and grind until the specific surface area of ​​the particles is 2800-3000cm 2 / g, you can get BFS oil well cement.

Embodiment 2

[0041] A BFS oil well cement comprises BFS and clinker, and the weight ratio of the BFS and clinker is 20:100.

[0042]Described BFS is made up of the raw material of following percentage by weight: CaO 38%, SiO 2 36%, Al 2 o 3 10%, MgO 10%, Fe 2 o 3 0.2%, MnO 0.8%, SO 3 5%.

[0043] Described clinker is made up of the raw material of following percentage by weight: CaO 61%, SiO 2 21%, Al 2 o 3 6%, MgO 3%, Fe 2 o 3 6%, SO 3 3%.

[0044] Mix BFS and clinker according to the ratio, and grind until the specific surface area of ​​the particles is 2800-3000cm 2 / g, you can get BFS oil well cement.

[0045] Compared with the G grade oil well cement, the BFS oil well cement disclosed in this embodiment can increase the bonding force between the cement stone and the casing and the formation by 55.6%, the shock resistance toughness can be increased by 21.8%, and the strength of the cement stone can be increased by 50.5% in the sulfate environment. , the late strength incr...

Embodiment 3

[0047] A BFS oil well cement comprises BFS and clinker, and the weight ratio of the BFS and clinker is 25:100.

[0048] Described BFS is made up of the raw material of following percentage by weight: CaO 46%, SiO 2 38%, Al 2 o 3 7%, MgO 4%, Fe 2 o 3 0.9%, MnO 0.1%, SO 3 4%.

[0049] Described clinker is made up of the raw material of following percentage by weight: CaO 64%, SiO 2 23%, Al 2 o 3 3%, MgO 3%, Fe 2 o 3 4%, SO 3 3%.

[0050] Mix BFS and clinker according to the ratio, and grind until the specific surface area of ​​the particles is 2800-3000cm 2 / g, you can get BFS oil well cement.

[0051] Compared with the G-grade oil well cement, the BFS oil well cement disclosed in this example can increase the bonding force between the cement stone and the casing and the formation by 55.8%, the shock resistance toughness can be increased by 21.9%, and the strength of the cement stone can be increased by 50.7% in the sulfate environment. , the late strength increase...

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Abstract

The invention discloses a BFS oil well cement. The BFS oil well cement comprises BFS and clinker, wherein a weight ratio of the BFS to the clinker is 20: 100 to 40: 100. The BFS comprises the following raw materials by weight: 38 to 46% of CaO, 36 to 42% of SiO2, 7 to 20% of Al2O3, 4 to 13% of MgO, 0.2 to 1% of Fe2O3, 0.1 to 1% of MnO and 1 to 5% of SO3. The clinker comprises the following raw materials by weight: 61 to 64% of CaO, 20 to 23% of SiO2, 3 to 6% of Al2O3, 1 to 3% of MgO, 3 to 6% of Fe2O3 and 3% of SO3. According to the invention, a part of the special raw material BFS is employed, a great number of simulation tests under different well depth conditions are carried out, and finally, an optimal composition range is determined; the structural characteristics and chemical activity of the raw material are made full use of, and every performance index is well balanced; thus, the overall performance index of the BFS oil well cement is obviously better than the overall performance index of G-grade oil well cement, and the BFS oil well cement has good effect in practical engineering application and exerts obvious improvement effect on well cementation quality.

Description

technical field [0001] The invention belongs to the technical field of special cement, and in particular relates to a BFS oil well cement and a preparation method thereof. Background technique [0002] The process of oil extraction is very complicated. Firstly, a well needs to be drilled on the ground to a depth of hundreds of meters to several thousand meters, and then a steel casing is inserted into the well hole. In order to make the casing and the formation tightly integrated, the industry has been using oil well cement as the cementing material for cementing construction, so as to support the casing and isolate the formation, and then perforate in oil-bearing geological formations at different depths , in order to realize the extraction of oil. Due to different geological conditions, physical and chemical parameters such as downhole pressure, temperature, acidity and alkalinity of underground rock formations, and groundwater vary greatly, so it is difficult to ensure t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06C04B7/34
Inventor 李建生宫延军
Owner BAODING BAOXING OIL FIELD CEMENTING MATERIAL MFG
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