Volume 38 Issue 4
Jul.  2021
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LIU Tengjiao, YU Yang, ZENG Xiangyu, et al.Drilling fluid technology for the third interval of well changtan-1 in jilin oilfield[J]. Drilling Fluid & Completion Fluid,2021, 38(4):479-485 doi: 10.12358/j.issn.1001-5620.2021.04.013
Citation: LIU Tengjiao, YU Yang, ZENG Xiangyu, et al.Drilling fluid technology for the third interval of well changtan-1 in jilin oilfield[J]. Drilling Fluid & Completion Fluid,2021, 38(4):479-485 doi: 10.12358/j.issn.1001-5620.2021.04.013

Drilling Fluid Technology for the Third Interval of Well Changtan-1 in Jilin Oilfield

doi: 10.12358/j.issn.1001-5620.2021.04.013
  • Received Date: 2021-02-09
    Available Online: 2023-11-09
  • Publish Date: 2021-07-31
  • The well Changtan-1, 5400 m in total depth, is an exploratory well drilled in the Changling rift, south of the Songliao Basin. The third interval of this well penetrated formations with high temperatures and igneous formations which are sloughing in nature. The mud used to drill these formations had low densities based on the designed value, and CO2 contamination deteriorated the properties of the mud. To solve these problems, a drilling fluid having temperature resistance of 200 ℃, good high temperature rheology, high plugging capacity and a certain CO2 contamination resistance, was formulated through laboratory experiments. A sulfonate copolymer filtrate reducer in the drilling fluid rendered it good high temperature performance and contamination resistance through colloid protection at elevated temperatures by the copolymer. Treatment of the drilling fluid with a nanometer SiO2 improved the rheological property and plugging capacity. In field application, the drilling fluid showed good high temperature stability, and effectively inhibit the sloughing of the igneous rocks. After contaminated with CO2, the drilling fluid still retained satisfactory performance and the contamination was easy to treat out. The well Changtan-1 was successfully completed, no downhole troubles were encountered during drilling, and set the record of drilling the deepest well in the Changling area in the south of Songliao basin.

     

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