Resin-based sealant is a true fluid with mechanical properties as a solid that far exceed Portland cement. While not ideal, Portland cement has developed into the sealant of choice for well applications. Reasons for its wide acceptance include history, availability and price. Early drillers needed a material that would start as a fluid and set after falling to the bottom of a well. In the late 19th century, Portland cement was the only common material that fit the bill. Low price and wide availability of the base material has been sufficient to drive a significant development effort in the well service industry over the last century to yield Pordand cement-based systems that are adequate sealants for a wide range of well applications. However, Portland cement is not ideal for many applications encountered in a well. First, it is too brittle, and tensile strength is too low to be durable under cyclic stress conditions. Cement seal reliability declines with well operations over time. Second, the solid particles that comprise oilwell cement slurry are too large to penetrate into small places such as formation porosity or a micro-annulus. Portland cement seals created across these areas therefore rely on surface bonding because the reactive sealant material does not permeate small holes. These and other drawbacks often result in repeated remedial applications to correct well problems. UltraSeal R Sealant, a new sealant developed by CSI Technologies, outperforms Portland cement in a number of well applications. This sealant is a true fluid that reacts to form a hard solid. Mechanical properties of the solid, especially tensile strength, shear bond strength and mechanical durability, are vastly superior to those of Portland cement. Therefore, the sealant will create a stronger, longer-lasting seal. Being a true fluid that can enter into formation porosity or a micro-annulus allows the sealant to be squeezed into place and then left to set, creating a deeper, stronger seal.
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机译：树脂基密封胶是一种真正的流体，其机械性能远远超过波特兰水泥。虽然不理想，但波特兰水泥已发展成为井井应用的首选密封胶。它被广泛接受的原因包括历史，可用性和价格。早期的钻井者需要一种可以起流体作用并落入井底后凝固的材料。在19世纪末，波特兰水泥是唯一符合要求的普通材料。基础材料的低价格和广泛可用性已经足以在上个世纪推动钻井服务行业的重大开发工作，从而生产出以Pordand水泥为基础的系统，该系统是适用于各种钻井应用的足够密封剂。然而，波特兰水泥对于井中遇到的许多应用而言并不是理想的。首先，它太脆，并且拉伸强度太低而不能在循环应力条件下持久。随着时间的流逝，水泥密封的可靠性会下降。第二，包含油井水泥浆的固体颗粒太大，无法渗透到诸如地层孔隙度或微环隙之类的小地方。由于活性密封剂材料不会渗透小孔，因此在这些区域上形成的波特兰水泥密封件依靠表面粘合。这些和其他缺陷通常导致需要反复进行补救以纠正油井问题。 CSI技术公司开发的新型密封剂UltraSeal R Sealant在许多油井应用中均优于Portland水泥。这种密封剂是真正的流体，会反应形成坚硬的固体。固体的机械性能，特别是抗张强度，剪切粘结强度和机械耐久性，远远优于波特兰水泥。因此，密封胶将产生更牢固，更持久的密封。由于是可以进入地层孔隙度或微环隙的真实流体，因此可以将密封剂挤压到位，然后静置以形成更深，更牢固的密封。
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