High Temperature Plugging Mechanism and Experimental Evaluation of Temporary Plugging Agent

doi:10.3969/j.issn.1006-396X.2022.02.010

Abstract

Abstract:

Given the deep burial depth,high temperature and high pressure, significant heterogeneity of the deep gas reservoirs in the southern margin of the Junggar Basin,the temporary plugging and diverting stimulation technology with stratification and segmentation was used to achieve efficient stimulation and improve the producing degree of those reservoirs.The plugging of fractures and perforations by temporary plugging agents under the high temperature of 140~180 ℃ was experimentally investigated,and the degradation rates and pressure?bearing capacities of five temporary plugging materials were evaluated respectively.The results show that the commonly used temporary plugging materials will soften under a high temperature and tend to flow with the carrying fluid under the displacement pressure difference, resulting in a decreased pressure?bearing capacity of the temporary plugging section and the loss of plugging effect. A temporary plugging material with a pressure?bearing capacity of 30.00 MPa at 180 ℃ was selected, and its field application results showed that the temporary plugging improved production significantly.

Key words: Temporary plugging of fractures, Temporary plugging of perforations, Degradable material, Pressure?bearing capacity

摘要：

准葛尔盆地南缘深层气藏埋藏深，具有高温高压、非均质性较强等特点，采用暂堵转向分层分段改造工艺实现了高效改造，提高了储集层动用程度。开展了140~180 ℃高温条件下暂堵剂对裂缝和炮眼的封堵实验研究，针对性评价了5种暂堵材料的降解速率和承压能力。结果表明，常用的暂堵材料在高温下会软化，在驱替压差下易随携带液流动，导致暂堵段承压能力下降，失去封堵效果。优选了在180 ℃下承压能力达30.00 MPa的暂堵材料，现场应用结果显示采用暂堵剂后产量显著增加。

关键词: 裂缝暂堵, 炮眼暂堵, 可降解材料, 承压能力

CLC Number:

TE355

Rong Wang, Lishan Yuan, Yao Luo, Xuda Yang, Lü Bei, Jiaqi Cheng. High Temperature Plugging Mechanism and Experimental Evaluation of Temporary Plugging Agent[J]. Journal of Petrochemical Universities, 2022, 35(2): 62-67.

王荣, 袁立山, 罗垚, 杨旭达, 吕蓓, 程家麒. 暂堵剂高温封堵机理及实验评价[J]. 石油化工高等学校学报, 2022, 35(2): 62-67.

Figures/Tables 10

Table 1 Composition of guar carrying fluid

成分	质量浓度/(g $⋅$ mL ^-1)
羟丙基胍胶	0.003 0
柠檬酸	0.000 2
pH调节剂	0.001 5
交联剂	0.003 0

Table 1 Composition of guar carrying fluid

成分	质量浓度/(g $⋅$ mL ^-1)
羟丙基胍胶	0.003 0
柠檬酸	0.000 2
pH调节剂	0.001 5
交联剂	0.003 0

Fig.1 Experimental device for simulating temporary blocking at high temperature

Fig.2 Simulated perforation and fracture devices

Fig.3 Comparison of fracture temporary plugging pressure at different temperatures

Fig.4 Structure of temporary plugging material for internal cracks at different temperatures

Fig.5 Comparison of perforation temporary plugging pressure at different temperatures

Fig.6 Photos of the temporarily plugging section in the perforation at different temperatures

Fig.7 Comparison of degradation rates of different temporary plugging materials

Fig.8 Comparison of temporary plugging pressure of different types of temporary plugging materials at high temperature

Fig.9 Treating pressure curve of well BZ

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