Volume 41 Issue 5
Nov.  2024
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TIAN Hui, BU Yuhuan, HU Miaomiao, et al.Development and evaluation of a temperature-sensitive deformable fibrous capsule lost circulation material[J]. Drilling Fluid & Completion Fluid,2024, 41(5):630-639 doi: 10.12358/j.issn.1001-5620.2024.05.010
Citation: TIAN Hui, BU Yuhuan, HU Miaomiao, et al.Development and evaluation of a temperature-sensitive deformable fibrous capsule lost circulation material[J]. Drilling Fluid & Completion Fluid,2024, 41(5):630-639 doi: 10.12358/j.issn.1001-5620.2024.05.010

Development and Evaluation of a Temperature-Sensitive Deformable Fibrous Capsule Lost Circulation Material

doi: 10.12358/j.issn.1001-5620.2024.05.010
  • Received Date: 2024-03-21
  • Rev Recd Date: 2024-05-19
  • Publish Date: 2024-11-07
  • A temperature-sensitive deformable fibrous capsule with shape memory has been developed to address the difficulties in mixing cement slurries and the slurry thickening problem caused by the oversize and excessive dosage of the fibrous materials presently in use, such as glass fiber, polypropylene fiber, sisal fiber and ceramic fiber etc. When the ambient temperature is lower than the deformation-response temperature, the particle sizes of the fibrous capsules are relatively small, therefore it is easy for the capsule particles to form high density particle packing in passages through which cement slurries are lost. When the ambient temperature reaches the deformation-response temperature, the fibrous capsules are activated and begin to expand, causing the particles packed in high densities to squeeze each other and to form high strength bridging inside the passages. The losses of the cement slurries are thus effectively brought under control. The process with which the fibrous capsules are produced can encapsulate 6 mm fibers into a 3 mm capsule, thereby increasing the effective concentrations and sizes of the fibers in loss-control cement slurries, improving the plugging performance of the cement slurries, minimizing the risks of fluid losses and ensuring the job quality of well cementing. The average fluidity of a cement slurry treated with the temperature-sensitive deformable fibrous capsules is 22 cm, and the initial consistency of the cement slurry is 25 Bc, comparable to the consistency of the pure cement slurry. Compared with cement slurries directly treated with fibrous materials, the cement slurry treated with the temperature-sensitive deformable fibrous capsules has rheology and pumpability that are significantly improved and the compressive strength of the set cement is greatly increased. The 7 d compressive strength of a set cement containing 5% temperature-sensitive deformable fibrous capsules reaches 50 MPa. The development and application of the temperature-sensitive deformable fibrous capsules help solve the difficulties encountered in cement slurry mixing and the slurry thickening problem, and are of significance to the success of high-quality well cementing operation.

     

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