Ultralow-density cement paste system for well cementing

An ultra-low density, cement slurry technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of cement slurry leakage, affecting the design flowback height of cement slurry and cementing quality, etc., and achieve low water loss. , Rapid development of early strength, good settlement stability

Inactive Publication Date: 2019-01-25
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is easy to cause a large amount of cement slurry to leak directly into the coal reservoir, seriously affecting the designed flowback height of the cement slurry and the cementing quality

Method used

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  • Ultralow-density cement paste system for well cementing
  • Ultralow-density cement paste system for well cementing
  • Ultralow-density cement paste system for well cementing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An ultra-low density cement slurry system for cementing, and its preparation method is as follows:

[0023] S1. Preparation of suspension stabilizer: Weigh 50g of polyvinyl alcohol 1788, 35g of sodium silicate, 13g of sodium alginate and 2g of gypsum, dry mix and stir well, and set aside;

[0024] S2. Preparation of lightening materials: Weigh 5g sodium bentonite, 5g palygorskite and 100g hollow glass beads and mix them evenly;

[0025] S3. Preparation of ultra-low density cement slurry: Weigh 280g G-grade oil well cement, 10g ultrafine cement, 14g microsilica, 110g lightening material, 14g suspension stabilizer, 13.5g coagulant, 3g fluid loss agent and 4g dispersant , Sequentially add to 345mL water and stir evenly.

[0026] Taking the ultra-low-density cement slurry system prepared in Example 1 as the test object, the solid components and water of the cement slurry system were first weighed and mixed evenly, and then the slurry was prepared according to the standard GB / T 1913...

Embodiment 2

[0030] An ultra-low density cement slurry system for cementing, and its preparation method is as follows:

[0031] S1. Preparation of suspension stabilizer: weigh 60g polyvinyl alcohol 1788, 30g sodium silicate, 7g sodium alginate and 3g gypsum, dry mix and stir well, and set aside;

[0032] S2. Preparation of lightening materials: weigh 20g expanded perlite and 90g hollow glass beads and mix them evenly;

[0033] S3. Preparation of ultra-low-density cement slurry: Weigh 280g G grade oil well cement, 20g microsilica, 110g lightening material, 8.4g suspension stabilizer, 14g coagulant, 3g fluid loss agent and 3g dispersant, and add them to 316mL in sequence Water and stir well.

[0034] Taking the ultra-low-density cement slurry system prepared in Example 2 as the test object, first weigh the solid components and water of the cement slurry system and mix them evenly, and then prepare according to the standard GB / T 19139 "Oil Well Cement Test Method" For the slurry, refer to the oil we...

Embodiment 3

[0038] An ultra-low density cement slurry system for cementing, and its preparation method is as follows:

[0039] S1. Preparation of suspension stabilizer: weigh 60g polyvinyl alcohol 1788, 30g sodium silicate, 9g sodium alginate and 1g gypsum, dry mix and stir evenly, set aside;

[0040] S2. Preparation of lightening materials: Weigh 5g sodium bentonite and 70g hollow ceramic beads, and mix them evenly;

[0041] S3. Preparation of ultra-low-density cement slurry: Weigh 280g G grade oil well cement, 20g microsilica, 75g lightening material, 8.4g suspension stabilizer, 14g coagulant, 3g fluid loss agent and 3g dispersant, and add them to 280mL in sequence Water and stir well.

[0042] Taking the ultra-low-density cement slurry system prepared in Example 3 as the test object, first weigh the solid components and water of the cement slurry system and mix them evenly, and then prepare according to the standard GB / T 19139 "Oil Well Cement Test Method" For the slurry, refer to the oil wel...

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Abstract

The invention discloses an ultralow-density cement paste system for well cementing. The system comprises, by weight, 100 parts of oil well cement, 5-8 parts of micro silicon, 0-4 parts of oil well ultrafine cement, 25-40 parts of lightening materials, 2-5 parts of suspension stabilizer, 0-5 parts of coagulant, 1.0-1.2 parts of fluid loss agent, 1.0-1.5 parts of dispersing agent and 95-125 parts ofwater, wherein the particle size of the micro-silicon is 0.2-2 micron; the lightening materials comprise at least two of sodium bentonite, palygorskite, expanded perlite, hollow glass beads and hollow ceramic micro-beads. The ultralow-density cement paste system for the well cementing is suitable for well cementing operation of a low-pressure stratum which is likely to leak, and the manimum density can be 1.04 g/cm<3>. The ultralow-density cement paste system has the advantages of being rapid in setting at low temperature, rapid in strength development in the early stage, good in sedimentation stability and low in water loss.

Description

Technical field [0001] The invention relates to the technical field of low pressure and easy leakage cementing, in particular to an ultra-low density cement slurry system for cementing. Background technique [0002] For shallow leaky wells and coalbed methane wells, cementing is one of the key links, and cementing quality largely depends on low-density cement slurry. Especially in the field of coalbed methane mining, the requirement for cement slurry density is lower. The exploitation of coal-bed methane fields has always been a technical difficulty in petroleum engineering. At present, the development of coalbed methane in Shanxi and Jiangxi has begun to take shape and is showing an increasing trend. Due to the limitation of coal seam physical properties, the domestic CBM well completion technology mainly uses casing perforation. Cementing operation is a key part of the casing completion process, and the cement slurry system determines the quality of cementing to a large exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C09K8/467
CPCC04B28/00C04B2111/00724C04B2201/20C04B2201/50C09K8/467C04B18/146C04B24/2623C04B12/04C04B24/38C04B22/143C04B14/104C04B14/102C04B14/24C04B24/161C04B2103/12
Inventor 刘景丽任强孟庆春彭松曹洪昌马骏毕毅姜鹏李秀妹王菁刘欣刘超薛莉
Owner CNPC BOHAI DRILLING ENG
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