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High performance calcium aluminate oil well cement

An oil well cement and calcium aluminate technology, applied in the field of well cement, can solve the problems of poor salt resistance and acid resistance, increased permeability, etc., and achieve stable mechanical properties, strong salt and acid resistance, and good rheology. Effect

Inactive Publication Date: 2014-04-23
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, oil well cement can make the cement have good mechanical properties and durability, but the salt and acid resistance are poor. The shrinkage of the cement stone during the hydration process will also increase the permeability. The use of high alumina cement can overcome the above. defect

Method used

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  • High performance calcium aluminate oil well cement
  • High performance calcium aluminate oil well cement
  • High performance calcium aluminate oil well cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] High temperature basic performance evaluation of calcium aluminate cement

[0024] The indoor experiment method of cement slurry is as follows:

[0025] First weigh each component, then put it into a clean glass container and mix it by hand; put the mixed solid phase into a high-speed blender, add an appropriate amount of water and stir, stir at 4000rpm for 25 seconds, then change to 12000rpm and stir for 35 seconds. Measure the basic properties of grout. The prepared cement slurry was poured into cement stone making molds and cured for 7 days at 100°C and 35MPa, and the compressive strength of cement stone was measured. The formula of calcium aluminate used in the experiment is as follows:

[0026] Formula 1: 500g calcium aluminate cement + 300mL water + 150g 60 mesh silica fume + 20g microsilica fume + 5gHPAM + 3.0g GH-9 high temperature retarder + 4g G33S high temperature fluid loss reducer.

[0027] Formula 2: 500g calcium aluminate cement + 350mL water + 150g 60...

Embodiment 2

[0035] Weigh each component, then put it into a clean glass container and mix it by hand; put the mixed solid phase into a high-speed mixer, add an appropriate amount of water and stir, stir at 4000rpm for 25s, then change to 12000rpm and stir for 35 seconds. Measure the basic properties of grout. The prepared cement slurry was poured into cement stone making molds and cured for 7 days at 150°C and 35MPa, and the compressive strength of cement stone was measured. The formula of calcium aluminate used in the experiment is as follows:

[0036] Formula 1: 500g calcium aluminate cement + 300mL water + 150g 60 mesh silica fume + 20g microsilica fume + 5gHPAM + 3.0g GH-9 high temperature retarder + 4g G33S high temperature fluid loss reducer.

[0037] Formula 2: 500g calcium aluminate cement + 300mL water + 150g 100 mesh silica fume + 20g microsilica fume + 5gHPAM + 3.0g GH-9 high temperature retarder + 4g G33S high temperature fluid loss reducer.

[0038] Formula 3: 500g calcium ...

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Abstract

The invention discloses a high performance calcium aluminate oil well cement, and belongs to the field of oil well cements of oil and gas well cementing, and the high performance calcium aluminate oil well cement comprises the following components by weight: 100 parts of calcium aluminate oil well cement, 20 to 40 parts of silicon powder, 0 to 10 parts of micro silica powder, 0 to 2 parts of a flow type regulator, 0 to 5 parts of a fluid loss agent and 0 to 5 parts of a retarder. According to the invention, the strength of the high performance calcium aluminate oil well set cement after 7days of maintenance is greater than 80MPa, the long-term strength is stable, and the high performance calcium aluminate oil well cement has strong salt resistance and acid resistance. In the mixing amount of the invention, the cement slurry rheological property is good, and mechanical properties of the set cement at high temperature and under high pressure are stable.

Description

technical field [0001] The invention relates to a well cement, especially a high-performance calcium aluminate oil well cement with good mechanical properties and chemical stability, which is suitable for the acidity in the formation and the environment requiring early strength, and can be used for drilling oil and gas wells or geothermal wells Engineering cementing operations. Background technique [0002] Well cementing is to use some means to effectively seal the casing string run in the open hole section and the formation. The cementing construction operation is complicated, and multiple processes need to be completed during construction. After the entire cementing construction is completed, in order to ensure that the mechanical casing is sealed in the formation, cement needs to be filled in the annular space between the casing wall and the formation to protect the mechanical casing. [0003] In order to ensure the smooth production of oil and gas, it is particularly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C09K8/487C04B28/06
CPCC09K8/487C04B28/06C04B2103/22
Inventor 高飞宋元洪党冬红陈光周涛宋剑鸣吴晋波翁长松
Owner CNPC BOHAI DRILLING ENG
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