温度刺激响应型超分子相变压裂液的制备与性能评价
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中国石油天然气股份有限公司重大科技专项“华北油田持续有效稳产勘探开发关键技术研究与应用”(项目编号2017E-15)


Preparation and Performance Evaluation of Supramolecular Phase Change Fracturing Fluid with Thermal Stimuli-response
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    摘要:

    在石油开采水力压裂增产措施中,支撑剂的注入易导致脱砂、砂堵或注不进等问题,影响压裂效果。利用 超分子材料自组装特性,以N,N-二甲基甲酰胺(DMF)为溶剂,加入异氰脲酸酯和四甲基氯化铵等制备得到超分 子构筑单元,再加入功能单元以及十二烷基苯磺酸钠、聚乙烯呲咯烷酮、过氧化氢和氯化钙等对构筑单元进行修 饰制得相变压裂液。将相变压裂液和非相变压裂液混合后加热至80 ℃制得相变固体。通过核磁共振和扫描电 镜对合成产物进行表征,分析体系的微观结构,研究了相变压裂液的注入性和相变固体的抗压性、导流能力等。 结果表明,在升温过程中,相变压裂液分子自组装排列发生相变形成固体。相变压裂液的注入性良好,在20~ 70 ℃的平均黏度仅为17.55 mPa·s。相变固体具有良好的耐压抗破碎性能,28、52 MPa闭合压力下的破碎率分 别为1.83%、3.22%。不同铺砂浓度下相变固体的导流能力较好,高压导流能力接近陶粒且远高于石英砂。压裂 施工过程中只注入液体,压裂液在地层温度下形成固相从而支撑裂缝建立油气通道,避免了固相支撑剂的砂堵 和注入性问题。

    Abstract:

    In the hydraulic fracturing stimulation measures,the injection of proppant often leads to the problems such as sand out, sand plug or no injection,which affects the fracturing effect. Using the self- assembly characteristic of supramolecular material, supramolecular building unit was synthesized by using N,N- dimethylformamide(DMF)as solvent,adding isocyanurate and tetramethylammonium chloride,and then the phase change fracturing fluid(PCFF)was prepared by modifying the building unit through functional unit,sodium dodecyl benzene sulfonate,polyvinyl pyrrolidone,hydrogen peroxide,calcium chloride,etc. The PCFF and the non-phase change fracturing fluid were mixed and heated to 80 ℃ to prepare a phase change solid. The synthesized products were characterized by NMR and SEM,the microstructure of the system was analyzed,and the injectability of phase change fracturing fluid and the pressure resistance and flow conductivity of phase change solid were studied. The results showed that during the heating process,the molecular self-assembly arrangement of PCFF underwent a phase change and formed a solid. The PCFF had good injectability,and the average viscosity at 20—70 ℃ was only 17.55 mPa · s. The phase change solid had good pressure resistance and crush resistance,and the crushing rate under 28 and 52 MPa closing pressure was 1.83% and 3.22%,respectively. The conductivity of phase change solid under different sanding concentrations was better,and the high-pressure conductivity was close to that of ceramsite and much higher than that of quartz sand. During the fracturing construction process,only liquid was injected. The PCFF formed a solid phase at the formation temperature to support the fractures and established oil and gas channels,avoiding sand plugging and injectability problem of solid proppant.

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  • 在线发布日期: 2021-07-06
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