Based on the principle of mass balance, the Pseudo-Level Depth Finder can attain the true level by testing annular gas rate.
根据物质平衡方法设计的拟液面测试仪，可通过测试油井环空排气量来确定油井的真实液面。
Based on the principle of mass balance, the Pseudo-Level Depth Finder can attain the true level by testing annular gas rate.
根据物质平衡方法设计的拟液面测试仪，可通过测试油井环空排气量来确定油井的真实液面。
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