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    Continuous permeability reduction in subterranean reservoirs
    2.
    发明授权
    Continuous permeability reduction in subterranean reservoirs 失效
    地下水库连续渗透率降低

    公开(公告)号：US4534412A

    公开(公告)日：1985-08-13

    申请号：US559920

    申请日：1983-12-09

    申请人： Hoai T. Dovan ,  Richard D. Hutchins

    发明人： Hoai T. Dovan ,  Richard D. Hutchins

    IPC分类号： C09K8/512 ,  C09K8/88 ,  E21B33/138

    CPC分类号： C09K8/887 ,  C09K8/512

    摘要： A method for selectively reducing the permeability of the higher permeability zones of a subterranean reservoir having heterogeneous permeability, such permeability reduction extending continuously from nearby the well as far into the reservoir as is desired. There is injected into the reservoir an aqueous solution or solutions of a water-soluble polymer, a material capable under certain conditions of at least partially cross-linking the polymer to form a gelatinous precipitate, a water-soluble alkaline material in an amount sufficient to maintain the pH of the polymer-containing composition above the pH at which cross-linking occurs until the composition has passed a desired distance through the reservoir, and a temperature-activated water-soluble acidic material dissolved in the aqueous solution in an amount sufficient to lower the pH of the overall solution to the pH at which cross-linking occurs when said solution is subjected to an elevated temperature. A continuous gelatinous plug is formed which extends from the immediate vicinity of the well to a point as close to the well as about 20 feet, when it is desired to plug a feature of the strata which extends only a short distance therein, or as far into the well as is desired, for example up to 200 feet, when it is desired to plug an extensive zone of high permeability.

    摘要翻译： 一种用于选择性地降低具有不均匀渗透性的地下储层的较高渗透率区域的渗透性的方法，这种渗透率降低从所述井附近延伸到所述储层中。 向储存器注入水溶液或水溶性聚合物溶液，该溶液是在某些条件下能够至少部分地交联聚合物以形成凝胶状沉淀物的材料，水溶性碱性材料的量足以 保持含聚合物的组合物的pH高于发生交联的pH直到组合物已经通过储存器所需的距离，并且溶解在水溶液中的温度活化的水溶性酸性物质的量足以 将溶液的pH值降低至当所述溶液经受高温时发生交联的pH。 形成一个连续的胶状塞，其从井的紧邻附近延伸到靠近井的点为大约20英尺，当需要堵塞在其中仅延伸很短距离的地层的特征时，或者远离 当需要堵塞高渗透性的广泛区域时，如期望的，例如达到200英尺。

    Method for selectively reducing subterranean water permeability
    5.
    发明授权
    Method for selectively reducing subterranean water permeability 失效
    选择性降低亚硫酸盐渗透性的方法

    公开(公告)号：US5145012A

    公开(公告)日：1992-09-08

    申请号：US631863

    申请日：1990-12-21

    申请人： Richard D. Hutchins ,  Burton B. Sandiford ,  Hoai T. Dovan

    发明人： Richard D. Hutchins ,  Burton B. Sandiford ,  Hoai T. Dovan

    IPC分类号： C09K8/50 ,  C09K8/60 ,  E21B43/26

    CPC分类号： E21B43/261 ,  C09K8/50 ,  C09K8/60

    摘要： Gels containing gas precursors and/or pathways are used to selectively reduce the flow of aqueous fluids with respect to the flow of nonaqueous fluids to enhance the recovery of the nonaqueous fluids from subterranean formations. The gels, while stable at reservoir conditions, are also readily degraded by gel degrading agents such as acids and therefore are also employed as fail-safe gels in subterranean gel treatments. In another embodiment, selective permeability is restored to a previously treated well by injecting a gas into the previous treated portions of the subterranean formation to displace any aqueous fluid obstructing the passage of the nonaqueous fluid through the polymer-coated pores or gel.

    摘要翻译： 含有气体前体和/或途径的凝胶用于选择性地减少水流体相对于非水流体的流动，以增强从地下地层中回收非水流体。 凝胶在储层条件下稳定也容易被凝胶降解剂（如酸）降解，因此也被用作地下凝胶处理中的故障安全凝胶。 在另一个实施方案中，通过将气体注入到地下地层的先前处理的部分中以将任何含水流体阻挡非水流体通过聚合物涂覆的孔或凝胶的位置，将选择性渗透性恢复到预先处理的井。