Synthesis and Application of a Temperature Sensitive Deformable Plugging Agent
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摘要: 针对现有可变形封堵防塌处理剂作用温度过窄的问题，基于地层温度诱导控制材料形态变化实现对地层定向吸附的技术思路，开展温敏变形封堵处理剂分子结构设计，通过优化设计骨架、形变和分散性能，利用诱发分子内交联反应逐级拓宽有效作用温度区间，研发出适用于100～150 ℃的温敏变形封堵剂SMSHIELD-2。通过红外光谱、核磁和压力传递实验等对SMSHIELD-2进行结构表征和性能评价。结果表明SMSHIELD-2在100～150 ℃广谱温度范围内，有效封堵硬脆性泥岩的微裂缝，提高钻井液的封堵防塌性能且具有良好的配伍性。SMSHIELD-2在新疆顺北X1井复杂井段应用中，通过封堵地层原生孔隙和微裂缝，提高钻井液的封堵能力，稳定井壁，保障了复杂地层钻井安全。Abstract: Molecular structure design of temperature-sensitive deformable lost circulation materials (LCMs) was conducted in an effort to find a way of overcoming the problems existed in the current LCMs which can only be used in too narrow a temperature range. Based on the technical clue of directional adsorption of LCMs on the formations via deformation of the LCMs under the influence of formation temperature, a temperature-sensitive deformable LCM named SMSHIELD-2 was successfully developed through optimized design of molecular chain, deformability and dispersibility. The SMSHIELD-2 can be used in temperatures from 100 ℃ to 150 ℃ and the temperature range in which the SMSHIELD-2 can perform effectively is gradually broadened using induced intramolecular crosslinking reaction. Molecular structure characterization and performance evaluation of SMSHIELD-2 with IR spectrometry, NMR and pressure transfer tests show that SMSHIELD-2 functions properly in a wide temperature range between 100 ℃ and 150 ℃. SMSHIELD-2 has good compatibility with other additives. It is able to effectively seal off microfractures in hard brittle shales and to improve the plugging and anti-collapse performance of drilling fluids. SMSHIELD-2 was used in drilling the complex hole section of the well X1 in Shunbei block in Xinjiang. By plugging the primary pores and micro-fractures in the formations with SMSHIELD-2, the well was successfully drilled, and two new engineering records was made.
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Key words:
- Temperature sensitive /
- Anti-collapse /
- Seal and plug /
- Design of molecular structure /
- Drilling fluid
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表 1 SMSHIELD-2与其他封堵剂的对比
封堵剂 FLHTHP/mL △FL/% 空白 56 2.5%国内1 28 50 2.5% 国内2 26 54 2.5%国内3 27 52 2.5%Baker Hughes 23 59 2.5%Chevron 21 62 1%SMSHIELD-2 20 64 2.5%SMSHIELD-2 13 77 注：基浆配方：4% 预水化膨润土浆+4%英国评价土；在120 ℃滚动16 h后在120 ℃温度下测定滤失量 
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表 2 岩样受温敏变形封堵防塌剂作用前后的渗透率
测试试液 岩样的渗透率/mD 空白岩样 1.24×10−2 基浆 3.21×10−4 基浆+2% SMSHIELD-2 2.52×10−5 注：实验温度为100 ℃
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表 3 岩样受温敏变形封堵防塌剂作用前后的渗透率
测试试液 岩样的渗透率/mD 空白岩样 2.90×10−3 基浆 1.05×10−4 基浆+3% SMSHIELD-2 5.54×10−5 注：实验温度为150 ℃
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表 4 不同温度下的SMSHIELD-2性能评价
基
浆封 堵 /
剂%实验
条件PV/
mPa·sYP/
PaFLAPI/
mLFLHTHP/
mL△FL/
%1# 0 100 ℃、16 h 22 6 2.8 14.2 1.5 100 ℃、16 h 21 5.5 2.4 8.0 43.7 2# 0 120 ℃、16 h 26 7.5 2.3 14.6 2 120 ℃、16 h 25.5 7.5 2.4 8.2 43.8 3# 0 150 ℃、16 h 28 8 2.4 15.4 3 150 ℃、16 h 28.5 8.5 2.2 8.4 45.5 注：1#基浆 ：4%预水化膨润土浆+ (0.2%～0.3%)PAC-LV+1%SMC+1%SMP+0.1%NaOH；2#基浆：4%预水化膨润土浆+ (0.3%～0.4%) PAC-LV+1.5%SMC+1.5%SMP+
0.1%NaOH；3#基浆：4%预水化膨润土浆+(0.4%～
0.5%)PAC-LV+2%SMC+2%SMP+0.1%NaOH
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