模拟套管固井滑套工况下冲蚀实验方案设计

Schematic Design of Erosion Test on Cementing Sliding Sleeves in Fracturing Operations

王国荣 钱权 杨昌海 魏辽 郭朝辉

WANGGuorong QIANQuan YANGChanghai WEILiao GUOZhaohui

西南石油大学机电工程学院, 四川 成都 610500 中国石化石油工程技术研究院, 北京 朝阳 100101

School of Mechatronic Engineering of Southwest Petroleum University, Chengdu, Sichuan 610500, China Research Institute of Petroleum Engineering, SINOPEC, Chaoyang, Beijing 100101, China

新研发的井下工具必须经严格实验检验才能投放现场，因此，实际工况的准确模拟显得尤为重要。针对固井滑套在压裂时具有大排量与高含砂比的特点，设计了四泵串并联方式的工况模拟实验模型。根据实验条件，先假设冲蚀实验设备连接方案为两泵并联方式，而理论计算得出泵为管路所提供的扬程需达到35.82 m，与实测单台离心泵特性曲线相结合，最终确定了设备连接方案为四泵串并联方式。通过监测模拟冲蚀实验中的排量与含砂比，结果表明，所设计的实验方案能够满足模拟大排量（4.5~7.0 m/min）、高含砂比（体积比25%）的冲蚀要求且存在较大余量；同时得出进行压裂作业时不同孔眼数的滑套对管路整体压力损耗、实验流量、泵送能力等影响明显。

New downhole tool inventions should be used after severe tests because the accurate simulation of the actual working conditions is very important. This study explains a four-serial-parallel pump test model to simulate erosion with the creation of a large discharge and high sand content when cementing sliding sleeves were in the operating mode. First, the equipment connection scheme was hypothesized for a two-parallel pump model according to the field test conditions. Then, the equipment connection was designed so that the pump lift in the pipelines reached 35.82 m based on detailed theoretical calculation. With this figure and the characteristic curve of the actual measurement of one centrifugal pump, the equipment connection was set up as a four-serial-parallel pump model. The simulation results showed that the scheme met the erosion requirements for a large discharge (4.5 to 7.0 m/min) and high sand content (volume ratio of 25%) and had a large allowance. Furthermore, the test showed that in all fracturing operations, different numbers of sliding sleeve eyelets influenced the overall pipeline pressure loss, test flow, and pump efficiency.

10.11885/j.issn.1674-5086.2015.07.01.23