Volume 38 Issue 5
Sep.  2021
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LI Fei.Study on optimization of high temperature cement slurry with elasticity and toughness[J]. Drilling Fluid & Completion Fluid,2021, 38(5):623-627 doi: 10.12358/j.issn.1001-5620.2021.05.013
Citation: LI Fei.Study on optimization of high temperature cement slurry with elasticity and toughness[J]. Drilling Fluid & Completion Fluid,2021, 38(5):623-627 doi: 10.12358/j.issn.1001-5620.2021.05.013

Study on Optimization of High Temperature Cement Slurry with Elasticity and Toughness

doi: 10.12358/j.issn.1001-5620.2021.05.013
  • Received Date: 2021-04-21
  • Publish Date: 2021-09-30
  • In the oil and gas development in the Shunbei block and the Beipo (north slope) block in the middle of Tarim basin, the set cement of conventional cement slurries is found to be hard and brittle, therefore micro gaps are easily to form during fracturing operation, damaging the integrity of the cement sheath. A new method for improving the elasticity and toughness of set cement has been developed through theoretical analysis and laboratory experiment, converting the high performance materials in conventional technology into high performance structure. The elasticity of set cement is improved using a hydrophilically modified poly-fluorine rubber powder, the toughness of the set cement is enhanced through the synergy of organic and inorganic fibers, and the strength of the set cement is increased by improving the microstructure of the set cement with nano-silica. A high temperature elasticity and toughness enhancer was developed. As a cost-effective additive, it works properly at high temperatures up to 150 ℃, it is able to reduce the elastic modulus of set cement by 37.13% and helps the set cement to maintain a higher strength at the same time. Using this high temperature elasticity and toughness enhancer as the key additive, a cement slurry with high temperature elasticity and toughness was formulated with other additives selected through careful evaluation. The cement slurry has good rheology and proper thickening time. The API filter loss of the cement slurry is 45 mL, the elastic modulus and the compressive strength of the set cement are 6.089 GPa and 30 MPa respectively, satisfying the needs of oil and gas well cementing. The development of this cement slurry has set a foundation for the popularization of high temperature high strength high toughness cement slurries.

     

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