Study and Application of Well Test Fluid for HTHP Wells in Ying-Qiong Basin in South China Sea
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摘要: 南海莺琼盆地高温、高压、高含CO2气体、低孔低渗等复杂地质条件要求测试液具有良好的抗温稳定性、沉降稳定性、抗CO2污染能力及储层保护能力。由于前期无专用高温高压测试液,导致复杂情况频发,经过多年研究与实践,在完钻使用的钻井液中引入抗高温降滤失剂Calovis,适当提高测试液碱度,合理控制测试液的MBT,配合使用超细重晶石加重,同时提高测试液的返排性能,形成了一套高温高压井测试液技术。该测试液在莺琼盆地2口高温高压探井测试作业得到成功应用,其中一口井CO2含量达到23%,井底温度超过200℃,测试液密度达到2.33 g/cm3,射孔压力及环空压力传递正常,静置7 d后,封隔器解封顺利,测试液性能未发生恶化,测试产量均超过预期产量,完成全部测试任务。Abstract: Drilling fluids with good thermal stability, settling stability, CO2 contamination resistance and reservoir protection are required to drill wells in the Ying-Qiong Basin in South China Sea where high temperature, high pressure, CO2, and low porosity/low permeability prevail. Downhole troubles have been frequently encountered because of lack of special high temperature high pressure (HTHP) test fluid previously. In many years of study and field practices a set of HTHP test fluid technology has been developed by introducing a high temperature filter loss reducer Calovis into drill-in fluids used, increasing the pH value of the test fluid appropriately, controlling the MBT of the test fluids in a reasonable range, weighting the test fluids with ultra-fine barite, and enhancing the flowback properties of the test fluids. The test fluids have been successfully used on 2 HTHP exploratory wells in the Ying-Qiong Basin. One of the well had CO2 content of 23%, bottom hole temperature over 200℃, and the density of the test fluid used was 2.33 g/cm3. Perforation pressure and annular pressure were transmitted normally. After standing for 7 days, the packer was retrieved successfully, and the properties of the test fluid were not deteriorating. The tested production rate was higher than the expected production rate. All test tasks have been satisfactorily completed.
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