Volume 36 Issue 6
Dec.  2019
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2019  >  36(6): 759-765
DING Zhiwei, LI Jiaqi, ZHAO Jingying, ZHANG Minghui, YIN Changsheng, HE Li. Normal Spotting and Reverse Squeezing of Low-density Cement Slurries in Wells with Narrow Safe Drilling Windows[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 759-765. doi: 10.3969/j.issn.1001-5620.2019.06.018
Citation: DING Zhiwei, LI Jiaqi, ZHAO Jingying, ZHANG Minghui, YIN Changsheng, HE Li. Normal Spotting and Reverse Squeezing of Low-density Cement Slurries in Wells with Narrow Safe Drilling Windows[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 759-765. doi: 10.3969/j.issn.1001-5620.2019.06.018
shu

Normal Spotting and Reverse Squeezing of Low-density Cement Slurries in Wells with Narrow Safe Drilling Windows

doi: 10.3969/j.issn.1001-5620.2019.06.018

  • 1. CNPC Engineering Technology R&D Company Limited, Beijing 102206;

  • 2. Exploration Department of PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610000;

  • 3. Development Department of PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610021;

  • 4. PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000;

  • 5. No. 1 Cementing Company BHDC, PetroChina, Renqiu, Hebei 062552;

  • 6. Downhole Service Company, CNPC Chuanqing Drilling Engineering Co Ltd, Chengdu, Sichuan 610052

  • Received Date: 2019-08-22
  • Publish Date: 2019-12-30
    Abstract
  • The φ273.05 mm section of the well Yingbei-1 (Southwest Oilfield) penetrated formations with widely distributed thief zones and active oil and gas zones. Low density low temperature cement slurries used in previous cementing operations had low strength and slow hardness development. To address these problems encountered, a high strength low density (1.23 g/cm3) cement slurry with high toughness and the ability of anti-channeling has been developed. This cement slurry has thickening time that is adjustable and fast developed gel strength. The strength of the cement slurry develops after 440 min at 62℃, and reaches the maximum value of 14.5 MPa after 24 h. The elastic modulus of the cement is 5.8 GPa. Using this cement slurry with other technical measures, such as contaminationresistant flushing spacer, software simulation, optimization of the structure of the cement slurry column, and normal spotting/reverse squeezing etc., the φ273.05 mm casing string was successfully and safely cemented. Rate of certified job was 85% and rate of quality job was 65%. The technology used in cementing the well Yingbei-1 has provided a technical reference for cementing wells with narrow safe drilling windows in southwest oil and gas field.

     

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