声波无线遥测技术在南海东部古近系地层测试中的应用

Application of acoustic wireless telemetry technology in paleogene formation testing in the eastern South China Sea

南海东部古近系储层埋藏深,探井DST地层测试风险大,传统的存储式和电缆地面直读式压力传输方式均不能同时保证测试的实时性、安全性和时效性。声波无线遥测技术利用声波在测试管柱中的传播实现信号传递,通过井下中继器克服声波信号传输中的衰减问题,实现井下压力温度数据上行和操作指令下行的双向传输功能。应用该技术对南海东部X井古近系储层进行DST测试,在不同测试阶段下载实时压力数据,辅助判断了射孔情况、产能测试稳定情况、以及关井压力恢复阶段,获取有效的井底压力和温度数据,准确解释得到测试井产能和储层参数,并提高了作业时效性。该技术为海上油气井的测试提供了一种安全、高效、准确的井下数据传输方式,具有良好的实用性。

The paleogene reservoirs in the eastern South China Sea are deeply buried,so the risk of DST well testing in exploration wells is high.Traditional storage and cable surface direct-reading pressure transmission methods cannot simultaneously ensure the real-time,safety,and timeliness of testing.The wireless telemetry technology of sound waves utilizes the propagation of sound waves in the test string to achieve signal transmission.Through underground repeaters,the attenuation problem in sound signal transmission is overcome,achieving bidirectional transmission functions of upward propagation of underground pressure/temperature data and downward propagation of operation instructions.This technology was applied to conduct DST well testing on the Paleogene reservoir of Well X in the eastern South China Sea.Real time pressure data was downloaded at different testing stages to assist in judging the perforation situation,stability of production capacity testing,and the recovery stage of build-up pressure.By obtaining effective bottom hole pressure and temperature data,the production capacity and reservoir parameters of the test well are accurately explained,and the timeliness of the operation is improved.This technology provides a safe,efficient,and accurate underground data transmission method for the testing of offshore oil and gas wells,and has good practicality.