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致密砂岩气藏需要经多层压裂才能实现工业产能,以往分层压裂井下工具喷砂器安装在水力锚和封隔器之上,这样在携砂液通过喷砂器时候就容易造成支撑剂沉降在封隔器胶筒上面埋掉水力锚,造成压后起管柱时砂卡,以致工艺的失败,甚至是造成大修等事故。根据流体力学分析,经管柱挠度弯曲和材质耐磨性计算,优化喷砂器、水力锚结构与强度,形成了新型喷砂器暨水力锚总成一体化结构,满足了防砂卡和压裂施工井下管柱强度要求。现场应用9口井,工艺成功率达到100%,其中单层施工规模最大达到80m3,压后起管柱无砂卡,喷砂器暨水力锚总成未见明显磨蚀现象,达到了预期效果。
Tight sandstone gas reservoirs require multiple fracturing to achieve industrial capacity. In the past, the fracturing tool downhole sandblasting was installed above the hydraulic anchor and packer so that it was easily supported by sand blasting fluid The agent settles down the hydraulic anchor above the packer cartridge, resulting in a sand trap when the column is pressed, resulting in a process failure or even an overhaul. According to the analysis of fluid mechanics, the bending deflection and material wear resistance of tubular column are optimized, the structure of sandblast and hydraulic anchor are optimized, and the integrated structure of new sandblast and hydraulic anchor assembly is formed, which meets the requirements of sand control card and fracturing construction Downhole pipe strength requirements. Nine wells were used in the field, and the process success rate reached 100%. The single-layer construction reached a maximum of 80m3. After the pressure was applied, there was no sand card in the pipe string. No obvious abrasion was observed in the sandblasting machine and hydraulic anchor assembly, which achieved the expected result.