第 49 卷 第 3 期 石 油 钻 探 技 术 Vol. 49
2021 年 5 月pore-permeability test data is distorted, seriously hampering the
establishment of the CBM development plan. Therefore, a CBM coring tool with pressure maintenance, thermal
insulation and shape preservation capabilities was developed. By designing an arc closed ball-valve, the failure in the
pressure-maintenance seal was overcome by using a fully sealed ball-valve chamber that can withstand a pressure of
60 MPa. Using rubber tubes to hold cores and silica aeroge for thermal insulation, a composite coring inner barrel with
thermal insulation function was designed, which allowed the coring tool to achieve the advantages of both pressure
confinement and thermal surface-set and impregnated composite diamond coring bit was optimized,
thereby improving the coring bit footage. The CBM coring tool was applied to Well G-X20 for three times, obtaining a
cumulative footage of m, with a coring recovery rate of %, and a pressure maintenance rate up to 80%. The
results showed that the proposed coring tool for CBM was very effective in pressure maintenance and gas preservation.
Combined with sophisticated field construction technology, the coring tool can provide technical sup
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