Volume 40 Issue 3
May  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(3): 332-339
ZHAO Haiyang, FAN Sheng, LIAN Shixin, et al.Study on high temperature resistant weak gel anti gas invasion drilling fluid system in Shunbei oil and gas field[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：332-339 doi: 10.12358/j.issn.1001-5620.2023.03.008
Citation: ZHAO Haiyang, FAN Sheng, LIAN Shixin, et al.Study on high temperature resistant weak gel anti gas invasion drilling fluid system in Shunbei oil and gas field[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：332-339 doi: 10.12358/j.issn.1001-5620.2023.03.008
shu

Study on High Temperature Gas-Cut Resistant Weak Gel Drilling Fluid in Shunbei Oil and Gas Field

doi: 10.12358/j.issn.1001-5620.2023.03.008
  • 1.

    Petroleum Engineering Technology Research Institute of Sinopec Northwest Oilfield Company, Urumqi, Xinjiang 830011

  • 2.

    Petroleum Engineering Supervision Center of Sinopec Northwest Oilfield Company, Luntai, Xinjiang 841600

  • 3.

    Jingzhou Jiahua Technology Co., Ltd., Jingzhou, HuBei 434000

  • Received Date: 2022-12-05
  • Rev Recd Date: 2023-02-21
    • Available Online: 2023-07-21
  • Publish Date: 2023-05-30
    Abstract
  • The carbonate Yijianfang formation and the Yingshan formation of the Ordovician system in the Shunbei oil and gas field is developed with microfractures and active gas zones. Serious and frequent CH4 and CO2 gas cut ascended fast in the annular spaces, leading to coexistence of mud losses and well blow-out. To prevent gas cut, previous experiences obtained in the Shunbei oil and gas field were borrowed and analyzed, and a high temperature weak gel drilling fluid was developed to deal with the gas cut problem. Several additives were used to formulate this drilling fluid, such as a high temperature stabilizer MG-HT, a high temperature rheology modifier JHVIS, a high temperature filter loss reducer JHFLO and a high temperature plugging agent JHSEAL, as well as other additives selected for this drilling fluid. This drilling fluid has high temperature resistance to 180 °C, good plugging capacity to gas cut and is able to improve the pressure bearing capacity of the formations. This drilling fluid can be weighted to 1.8 g/cm3 and has good rheology, filtration property and contamination resistance. The 6-RPM and 3-RPM readings of the drilling fluid measured on a 6-speed direct-reading rheometer are both greater than 5, and the low-shear-rate viscosity of the drilling fluid is greater than 15,000 mPa·s. Formations strengthened with this drilling fluid have forward and backward pressure bearing capacities of greater than 5 MPa and 1 MPa, respectively. This weak gel drilling fluid, with good gas cut preventing capacity, has provided a technical support to the safe, fast exploration and development of the fractured carbonate reservoirs in the Shunbei oil and gas field.

     

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