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    • 2. 发明申请
    • WELLBORE FLUID
    • 井底流体
    • WO2009047480A1
    • 2009-04-16
    • PCT/GB2008/003237
    • 2008-09-24
    • BP EXPLORATION OPERATING COMPANY LIMITEDSAWDON, Christopher Alan
    • SAWDON, Christopher Alan
    • C09K8/10C09K8/20C09K8/24C09K8/52C09K8/86C09K8/68
    • C09K8/514C09K8/10C09K8/206C09K8/28C09K8/52C09K8/68C09K8/90C09K2208/08C09K2208/18
    • A method of carrying out a wellbore operation, which includes the steps of: (a) introducing into a wellbore an aqueous-based wellbore fluid comprising: - an aqueous base fluid having a first level of salinity; and - at least one polymer dissolved in said aqueous base fluid at a concentration of at least 1.Og/1, said polymer (i) having a viscosity average molecular weight in the range of from 20,000 to 900,000; and (ii) having a molecular structure such that the polymer chains dissolved in said wellbore fluid adopt a globular conformation, while in a fluid of a second level of salinity, said second level being a lower level of salinity than said first level, the polymer chains adopt an extended conformation; (b) allowing a filter-cake including said polymer in globular conformation to form; and subsequently (c) bringing a second fluid into contact with the filter-cake, said second fluid having a level of salinity which is lower than the level of salinity of said aqueous base fluid such that said polymer chains in said filter-cake adopt an extended conformation, thereby increasing the permeability of said filter-cake. The invention also provides novel compositions for use in the method of the invention.
    • 一种进行井眼操作的方法,其包括以下步骤:(a)向井筒中引入含水基井筒流体,其包括: - 具有第一盐度水平的含水基液; 和 - 至少一种以至少1.0g / l的浓度溶于所述含水基础液体中的聚合物,所述聚合物(i)的粘均分子量为20,000至900,000; 和(ii)具有分子结构,使得溶解在所述井筒流体中的聚合物链采用球形构象,而在第二水平盐度的流体中,所述第二水平比所述第一水平低的盐度水平,所述聚合物 链采用扩展构象; (b)使含有球状构象的所述聚合物的滤饼形成; 并且随后(c)使第二流体与滤饼接触,所述第二流体的盐度水平低于所述含水基础流体的盐度水平,使得所述滤饼中的所述聚合物链采用 扩展构象,从而增加所述滤饼的渗透性。 本发明还提供了用于本发明方法的新型组合物。
    • 5. 发明申请
    • APHRON-CONTAINING OIL BASE FLUIDS AND METHOD OF DRILLING A WELL THEREWITH
    • 含APHRON的油基础油和钻井方法
    • WO00047692A1
    • 2000-08-17
    • PCT/US1999/031050
    • 1999-12-27
    • C09K8/08C09K8/20C09K8/32C09K8/575E21B21/00C09K7/06C09K7/00
    • C09K8/08C09K8/206C09K8/32C09K8/5758E21B21/00
    • Aphron-containing oil based well drilling and servicing fluids are disclosed which seal microfractutres and the like during drilling and well servicing operations, thus decreasing the volume of fluid lost to the formations contacted by the fluids. The fluids comprise an oleaginous liquid as the continuous phase, a viscosifier which imparts a low shear rate viscosity to the fluids of at least 10,000 centipoise, an aphron-generating surfactant, and aphrons. The fluids are used in a conventional method of drilling an oil and/or gas well or in conventional methods of servicing or treating such wells, such as in completion, workover, sand control, and frac pack operations, and as spotting fluids to released stuck pipes or tools in a wellbore.
    • 公开了含有基于油的油基钻井和维修流体,其在钻井和井维修操作期间密封微细等,从而减少流体接触的地层损失的体积。 流体包括作为连续相的油质液体,赋予流体至少10,000厘泊的低剪切速率粘度的增粘剂,产生产生香味的表面活性剂和香料。 这些流体以常规的钻井和/或气井的方法或以常规的维修或处理这种井的方式使用,例如在完井,修井,砂控制和压裂包装操作中,以及作为点胶流体释放卡住 井筒中的管道或工具。
    • 6. 发明申请
    • APHRON-CONTAINING WELL DRILLING AND SERVICING FLUIDS OF ENHANCED STABILITY
    • 含APHRON的井筒钻井和维护液体的增强稳定性
    • WO00005323A1
    • 2000-02-03
    • PCT/US1999/015725
    • 1999-07-12
    • C09K8/08C09K8/20C09K8/575E21B21/00E21B31/03C09K7/02E21B33/138
    • E21B21/00C09K8/08C09K8/206C09K8/5758C09K2208/02E21B31/03
    • The invention provides a method and fluid for drilling or servicing a well in a subterranean formation containing lost circulation zones or depleted, low pressure reservoirs. A method of decreasing the density of the fluid circulated in a borehole, decreasing the invasion of fluid into formations contacted by the fluid, or decreasing the lost circulation potential of the fluid is provided by using as the fluid an aqueous liquid having dispersed therein a polymer which increases the low shear rate viscosity of the fluid to the extend that the shear thinning index of the fluid is at least about 10, a surfactant, and aphrons, wherein the aphrons are preferably generated by the turbulence and pressure drop as the fluid exits the drill bit in the vicinity of the formation, the fluid having a low shear rate viscosity of at least 10,000 centipoise. The fluid additionally contains an oligosaccharide mixture composed of pentosans and/or hexosans containing from one to about 10 combined sugar units selected from the group consisting of arabinose, mannose, galactose, glucose, xylose, cellobiose, and mixtures thereof. Preferably the oligosaccharide mixture is the water soluble portion of thermally hydrolyzed lignocellulose.
    • 本发明提供了一种用于钻井或维护含有流失区或耗尽的低压储层的地层中的井的方法和流体。 通过使用在其中分散有聚合物的水性液体作为流体来提供减少在钻孔中循环的流体密度的方法,减少流体侵入流体接触的结构,或降低流体的流失能力 这增加了流体的低剪切速率粘度,使得流体的剪切稀化指数至少为约10,表面活性剂和泡沫,其中,如果流体离开,优选地由湍流和压力下降产生 在地层附近的钻头,流体具有至少10,000厘泊的低剪切速率粘度。 该流体还含有一种寡聚糖混合物,其由含有1至约10个选自阿拉伯糖,甘露糖,半乳糖,葡萄糖,木糖,纤维二糖及其混合物的组合糖单元的戊聚糖和/或己糖酸组成。 优选地,寡糖混合物是热水解的木质纤维素的水溶性部分。