Volume 38 Issue 5
Sep.  2021
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ZHANG Xianmin, JIANG Xueqing, HUANG Ning, et al.Study on polymer blend used for controlling loss of oil based drilling fluids[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：593-597 doi: 10.12358/j.issn.1001-5620.2021.05.008
Citation: ZHANG Xianmin, JIANG Xueqing, HUANG Ning, et al.Study on polymer blend used for controlling loss of oil based drilling fluids[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：593-597 doi: 10.12358/j.issn.1001-5620.2021.05.008
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Study on Polymer Blend Used for Controlling Loss of Oil Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2021.05.008

  • Drilling Engineering Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co., Ltd., Puyang, Henan 457000

  • Received Date: 2021-05-06
  • Accepted Date: 2021-05-21
  • Publish Date: 2021-09-30
    Abstract
  • A lost circulation material (LCM) TP-C was developed for use in oil base muds to improve the residence of LCMs and the stability of the resident LCMs in fluid loss channels. TP-C is made by blending an amorphous lipophilic polymer AP, a crystalline polymer polypropylene (PP) and some other additives. In high temperature oils, the AP component of TP-C absorbs oils and swells, acquiring surface adhesion property; the PP component of TP-C has a lattice structure which is able to effectively control the solubility of the AP component. In an oil of 80 ℃, TP-C can absorb oil that is 2-3 times of the volume of TP-C itself, and also retains elastic deformability and adhesive capacity. In an oil of 130 ℃, TP-C as a whole shows high elasticity and has good elastic strength. Through the synergy of adhesion and squeezing bridging, TP-C is able to effectively reside on the slick walls of a fracture. A lost circulation control slurry formulated with TP-C and other materials was developed to control mud losses; it can form a whole densely bonded plug inside a 2 mm fracture, thereby improving the stability and pressure bearing capacity (which is at least 7.5 MPa) of the formations which are effectively plugged by the LCM slurry.

     

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