Volume 34 Issue 5
Sep.  2017
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LIU Deping. A High Strength Temporary Plugging Agent[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(5): 86-90. doi: 10.3969/j.issn.1001-5620.2017.05.016
Citation: LIU Deping. A High Strength Temporary Plugging Agent[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(5): 86-90. doi: 10.3969/j.issn.1001-5620.2017.05.016
shu

A High Strength Temporary Plugging Agent

doi: 10.3969/j.issn.1001-5620.2017.05.016

  • CNPC Chuanqing Drilling Engineering Company Limited Chuandong Drilling Company, chongqing 401147

  • Received Date: 2017-07-05
  • Publish Date: 2017-09-30
    Abstract
  • Many tools and facilities are required in expensive cement plug placement. Cement plug placement in deep and high temperature wells is of high safety risk. To minimize this risk and address the problems associated with cement plug placement, a high strength temporary plugging agent is required. The temporary plugging agent should have such properties as high strength, simplicity in preparing and convenience in pumping. Laboratory experiments have been conducted to select the core materials such as gelling agent and suspending agent, and to develop the required activator. Based on literature survey and laboratory experiments, a high strength temporary plugging agent GQ-1 was developed. GQ-1 has a wide density range (1.50-1.90 g/cm3) and stable properties. The mobility, flow index and consistency of GQ-1 are all in reasonable ranges. GQ-1 is compatible with commonly used drilling fluids, and the plug formed by GQ-1 has high strength. GQ-1 can be mixed with mud circulation and mixing systems, and pumped with drilling pumps. GQ-1 has been applied on two wells (Well Yangdu-H2, for instance) with great success. Pressure test on the plugs formed by GQ-1 in the two wells showed 63.3 MPa and 64.3 MPa, which were qualified. Success of the application on the two wells provided a technical support for the spreading of GQ-1.

     

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