抗返吐堵漏剂的研制及现场应用
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1.四川长宁天然气开发有限责任公司;2.中国石油西南油气田分公司页岩气研究院;3.川渝页岩气前线指挥部

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TE254

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西南油气田公司项目“宁209井区龙马溪组井漏防治关键技术研究”(项目编号20200302-21)


Development and field application of anti-returning and plugging agents
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Shale Gas Research Institute of PetroChina Southwest Oil and Gas Field Company,Chengdu

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    摘要:

    针对川渝区块页岩气堵漏高承压、易返吐的特点,本文以高软化点树脂为主体,研制了一种ARP抗返吐堵漏剂,具有变形和胶结固化能力,与桥堵颗粒复配使用,可在地层裂缝中与堵剂颗粒胶结固化,提高承压能力和抗返吐能力。实验室评价了ARP堵剂在现场油基钻井液中分散性、与现场堵漏剂的胶结强度,并测试了胶结固化后承压能力,以及抗返吐能力,根据现场应用的需求确定了ARP抗返吐堵漏剂密度为1.8g/cm3、粒径为0.5-2mm,并与现场堵剂形成了最优配比,即ARP抗返吐堵漏剂占25份,现场堵漏剂占75份,其胶结强度可达7.8MPa,封堵2-3mm天然裂缝时,正向承压可达8MPa,抗返吐能力可达3.3MPa。同时根据材料特点设计现场施工工艺,且取得较好的现场应用效果。

    Abstract:

    Aiming at the characteristics of shale gas plugging in Sichuan-Chongqing block, easy to blow back and high requirements for pressure, this paper developed a kind of ARP anti-return leakage plugging agent based on high softening point resin. It has the ability of deformation, cementation and curing. It can be used in combination with bridge plugging particles to cement and solidify with plugging agent particles in formation cracks to improve pressure bearing capacity and anti-return ability. The laboratory evaluated the dispersibility of the ARP plugging agent in the field oil-based drilling fluid and the bonding strength with the field leakage plugging agent, and tested the pressure bearing capacity and anti-return ability after the cementation was cured. According to the needs of field application, the density of ARP anti-return leakage plugging agent is determined to be 1.8g/cm3, the particle size is 0.5-2mm, and the optimal ratio is formed with the field plugging agent. That is, ARP anti-return leakage plugging agent accounts for 25 parts, and on-site leakage plugging agent accounts for 75 parts, and its bonding strength can reach 7.8MPa. When plugging 2-3mm natural cracks, the positive pressure can reach 8MPa, and the anti-reflection ability can reach 3.3MPa. At the same time, the on-site construction process is designed according to the material characteristics, and a good on-site application effect is achieved.

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  • 收稿日期:2022-02-07
  • 最后修改日期:2022-03-12
  • 录用日期:2022-03-21
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