Volume 35 Issue 4
Jul.  2018
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LI Guangji, ZHANG Minli, LI Shufeng, WANG Feng, HAO Shaojun, WANG Wei, LI Qiuming. Drilling Fluid Technology for “Four-High” Well Yantan-1[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(4): 20-27. doi: 10.3969/j.issn.1001-5620.2018.04.004
Citation: LI Guangji, ZHANG Minli, LI Shufeng, WANG Feng, HAO Shaojun, WANG Wei, LI Qiuming. Drilling Fluid Technology for “Four-High” Well Yantan-1[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(4): 20-27. doi: 10.3969/j.issn.1001-5620.2018.04.004

Drilling Fluid Technology for “Four-High” Well Yantan-1

doi: 10.3969/j.issn.1001-5620.2018.04.004
  • Received Date: 2018-04-05
  • Publish Date: 2018-07-30
  • The well Yantan-1 is a key well of mining rights protection of PetroChina Qinghai Oilfield Company. It is a vertical fourinterval exploration well drilled in the Luoyanshan structure in Yiliping in Qaidam Basin. The well was drilled to 5,909.95 m. The objectives of the well were to ascertain the potential of oil and gas production of the Luoyanshan Structure E32-N1; to understand the Since the well was shut in and killed in a prolonged time, the well had to be abnormally completed. Technical difficulties encountered during the drilling of this well are quite typical, and valuable experiences gained from the field operation are of good reference value in dealing with the same drilling difficulties. developmental state and hydrocarbon-generating potential of the Paleogene-Neogene dark-colored mudstones in Luoyanshan area, which will provide bases on which study and deployment of thermogenic gas exploration in the large-scale belt zone in the hinterland of Qaidam Basin can be performed in the future. Geological conditions of this well are quite complex, and no drilling data are available for reference. As a typical "four-high" well, the actual mud density used during drilling was as high as 2.50 g/cm3, the bottom hole temperature measured was as high as 205℃, CO2 concentration of the mud was 100% during CO2 invasion, and multiple high pressure salt water zones were encountered. A BH-WEI drilling fluid was selected to deal with these difficulties. Formulation of the mud and maintenance of the properties of the mud were focused on technical issues such as high temperature stability, resistance to sour gas contamination, resistance to salt water contamination, mud rheology at high density and filtration control. By elaborate adjustment of mud formulation and mud property maintenance, these technical difficulties were successfully resolved, and the well was successfully drilled to 5,700 m. When the well was then deepened to 5,909.95 m, an abnormally high pressure saltwater zone was encountered. Since the well was shut in and killed in a prolonged time, the well had to be abnormally completed. Technical difficulties encountered during the drilling of this well are quite typical, and valuable experiences gained from the field operation are of good reference value in dealing with the same drilling difficulties. Key words Qaidam Basin; Organic salt drilling fluid; Ultra-high density drilling fluid; High temperature; Salt water invasion; CO2 invasion; Borehole wall stabilization; Rheology

     

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