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    Friction reducer for hydraulic fracturing
    1.
    发明授权
    Friction reducer for hydraulic fracturing 有权

    公开(公告)号：US11274242B2

    公开(公告)日：2022-03-15

    申请号：US16798964

    申请日：2020-02-24

    Applicant: STEPAN COMPANY

    Inventor： Brian Seymour-Loya ,  Aaron Sanders ,  Dawn Friesen ,  Gregory P. Dado

    IPC: C09K8/68 ,  C10M157/04 ,  C10N50/00 ,  C10N30/06 ,  C10N40/08

    Abstract: Compositions comprising an acrylamide polymer emulsion and a nonionic surfactant suitable for use as friction reducers for hydraulic fracturing are disclosed. The nonionic surfactants include aralkylated phenol ethoxylates, amine ethoxylates, amidoamine ethoxylates, linear or branched alcohol EO/PO alkoxylates, ethoxylated alcohols, alkylphenol ethoxylates, and EO-capped poly(oxypropylene) block copolymers. Improved hydraulic fracturing processes in which an acrylamide polymer emulsion is used as a friction reducer are also described. In these processes, the surfactant is included in the composition with the acrylamide polymer friction reducer, or it is introduced separately into the process. The performance of low-cost polyacrylamide friction reducers can be boosted with a small proportion of certain readily available nonionic surfactants. The inventive compositions are effective in high-salinity environments, and their performance can sometimes exceed that of more-expensive salt-tolerant friction reducers, thereby reducing fresh water demand and enabling greater utilization of produced water.

    Steam foam methods for steam-assisted gravity drainage
    3.
    发明授权
    Steam foam methods for steam-assisted gravity drainage 有权

    公开(公告)号：US10989028B2

    公开(公告)日：2021-04-27

    申请号：US16781608

    申请日：2020-02-04

    Applicant: Stepan Company

    Inventor： Aaron Sanders ,  Gregory P. Dado ,  Brian Holland ,  Xue Min Dong ,  E. Carolina Rojas

    IPC: E21B43/24 ,  C09K8/584 ,  E21B43/30

    Abstract: Methods for making efficient use of steam in a steam-assisted gravity drainage (SAGD) process for recovering heavy oils from tar sands and similar petroleum deposits are disclosed. The methods utilize a surfactant to generate steam foam in ways that maximize efficient use of steam. In some aspects, steam foam is used in water layers or gas caps that reside above steam chambers to prevent loss of steam from the steam chamber. The predominant use of relatively dry steam in SAGD processes makes it challenging to find ways to introduce surfactants and generate steam foam. However, decreasing the mobility of the steam by converting at least some of it to foam allows the wellbore and steam chambers above the injection site to be more fully developed, provides for more effective heat transfer to the heavy oil and rock, improves production, and allows recovery of the heavy oil with a minimum amount of steam usage.

    Alpha-olefin sulfonic dimer acid process
    5.
    发明授权
    Alpha-olefin sulfonic dimer acid process 有权

    公开(公告)号：US10315988B2

    公开(公告)日：2019-06-11

    申请号：US15749798

    申请日：2016-07-28

    Applicant: STEPAN COMPANY

    Inventor： Gregory P. Dado ,  Aaron Sanders ,  Xue Min Dong ,  E. Carolina Rojas

    IPC: C09K8/02 ,  C09K8/94 ,  C07G99/00 ,  C07C303/06 ,  C07C303/22 ,  C07C309/04 ,  C07C309/05 ,  C07C309/20 ,  C07C309/62

    Abstract: Methods of making an alpha-olefin sulfonic dimer acid (AOS dimer acid) are disclosed. In one method, an alpha-olefin is sulfonated, preferably with sulfur trioxide, to produce a mixture comprising an alpha-olefin sulfonic acid (AOS acid) and sulfur dioxide. This mixture is then heated while purging sulfur dioxide and hydrogen sulfide from the reactor to produce an AOS dimer acid composition. In another method, the AOS acid mixture is treated to remove sulfur dioxide and is then heated to produce an AOS dimer acid composition. With either method, the resulting AOS dimer acid composition has at least a 30% decrease in the level of elemental sulfur when compared with that of an AOS dimer acid composition prepared by a similar process in the absence of any active removal of sulfur dioxide or hydrogen sulfide. AOS dimer acid compositions and salts of the AOS dimer acids, which are useful surfactants for oilfield and other applications, are also disclosed.

    Method for boosting viscosity of a fracturing fluid
    6.
    发明授权
    Method for boosting viscosity of a fracturing fluid 有权

    公开(公告)号：US12129434B2

    公开(公告)日：2024-10-29

    申请号：US18018139

    申请日：2021-06-24

    Applicant: Stepan Company

    Inventor： Alhad Phatak ,  Yonglin Ren ,  Brian Seymour-Loya ,  Aaron Sanders

    IPC: C09K8/80

    CPC classification number: C09K8/80 ,  C09K2208/28

    Abstract: A hydraulic fracturing method is disclosed. A small proportion of a nonionic surfactant is used in combination with an acrylamide polymer emulsion friction reducer, the proppant, and the base water to boost the viscosity of the fracturing fluid. The nonionic surfactant has a calculated HLB within the range of 10 to 17. The nonionic surfactants include selected aralkylated phenol ethoxylates, amine or amidoamine ethoxylates, mixed EO/PO alcohol alkoxylates, ethoxylated alcohols, ethoxylated amides, and alkylphenol ethoxylates. The nonionic surfactant boosts the viscosity of the fracturing fluid, promotes proppant transfer, and enables more-efficient hydrocarbon production.

    Demulsifying method for drilling fluids
    8.
    发明授权
    Demulsifying method for drilling fluids 有权

    公开(公告)号：US11472994B2

    公开(公告)日：2022-10-18

    申请号：US17133320

    申请日：2020-12-23

    Applicant: STEPAN COMPANY

    Inventor： Yongling Ginger Ren ,  Aaron Sanders ,  Jonathan Mohandessi

    IPC: C09K8/035 ,  E21B21/06

    Abstract: A method for demulsifying a recovered drilling fluid is disclosed. A recovered drilling fluid is first combined with dilution water and a diethanolamine-based C8-C18 alkanolamide demulsifying agent. The recovered drilling fluid comprises hydrocarbons, a brine having at least 25% total dissolved solids, an emulsifier, and undissolved oil-wetted solids. In a second step, the mixture is separated, or is allowed to separate, into three distinct phases, including a clear oil phase comprising the hydrocarbons, a clear brine phase, and a water-wetted solid phase. Compositions suitable for use as demulsifiers and demulsified compositions are also disclosed. The alkanolamide demulsifying agents enable rapid, clean separation of phases and efficient recovery of 80% or more of the oil phase from the recovered drilling fluid.

    Steam foam methods for steam-assisted gravity drainage
    10.
    发明授权
    Steam foam methods for steam-assisted gravity drainage 有权

    公开(公告)号：US10590749B2

    公开(公告)日：2020-03-17

    申请号：US15503293

    申请日：2015-07-31

    Applicant: Stepan Company

    Inventor： Aaron Sanders ,  Gregory P. Dado ,  Brian Holland ,  Xue Min Dong ,  E. Carolina Rojas

    IPC: E21B43/24 ,  E21B43/30 ,  C09K8/584

    Abstract: Methods for making efficient use of steam in a steam-assisted gravity drainage (SAGD) process for recovering heavy oils from tar sands and similar petroleum deposits are disclosed. The methods utilize a surfactant to generate steam foam in ways that maximize efficient use of steam. In some aspects, steam foam is used in water layers or gas caps that reside above steam chambers to prevent loss of steam from the steam chamber. The predominant use of relatively dry steam in SAGD processes makes it challenging to find ways to introduce surfactants and generate steam foam. However, decreasing the mobility of the steam by converting at least some of it to foam allows the wellbore and steam chambers above the injection site to be more fully developed, provides for more effective heat transfer to the heavy oil and rock, improves production, and allows recovery of the heavy oil with a minimum amount of steam usage.

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