Method for expanding the capacity for local storage of chemical products or their solutions in reservoir rock

{
  "publication_number": "US12286869B2",
  "country": "US",
  "kind": "B2",
  "title": "Method for expanding the capacity for local storage of chemical products or their solutions in reservoir rock",
  "abstract": "The present invention relates to a method for storing chemical products or their solutions in reservoir rock. In said method, the cargo boat containing the chemical product to be stored in the reservoir is connected to the production platform through an appropriate connection and connecting to the well header. The product is pumped through the chemical product capture line using a triplex chemical injection pump aligned to the head of the production or injection well. The product is pumped through the surface lines, riser and subsea line and, passing through the WCT, it is injected into the reservoir through the production or injection string.",
  "claims": [
    "1. A method for storing chemical products or their solutions in reservoir rock, comprising the steps of: (a) assessing a compatibility of the chemical product to be stored with a selected subsea reservoir; (b) selecting a product volumetry; (c) sending the chemical product to a production or injection header of a stationary production unit (SPU); (d) positioning the chemical product in a temporary storage tank present in the SPU; (e) pressurizing and sending the chemical product to a wellhead which passes the chemical product to a subsea line for injection into the reservoir; (f) penetrating the chemical product into reservoir rock of the reservoir, where it will be stored for later use; and (g) removing the chemical product from the reservoir rock and sending the removed chemical product to another wellhead which passes the removed chemical product to another subsea line for injection into another subsea reservoir, where a treatment using the removed chemical product will be carried out.",
    "2. The method according to claim 1, wherein the chemical product comprises a product selected from the group consisting of sulfonates, carboxylic acids and amides, or combinations thereof.",
    "3. The method according to claim 2, wherein the chemical product is selected from the group consisting of pentaphosphonates, phosphinopolycarboxylate, polyvinylsulfonate, sulfonated polyacrylic copolymers, polyacrylates, polyaspartates of α-linkage, polyaspartates of β-linkage, carboxy-methyl-inulin, or combinations thereof.",
    "4. The method according to claim 1, wherein the chemical product is selected from the group consisting of hydrate inhibitor, alcohols, glycols, poly-ethylene glycol, surfactants, silicone- or perfluorosilicone-based anti-foaming agents, or combinations thereof.",
    "5. The method according to claim 1, wherein in step (b), the volumetry of the chemical product is between 500 and 1000 bbl (79.49 and 158.99 m 3).",
    "6. The method according to claim 1, wherein in step (c), the chemical product is sent through a transfer line by a cargo vessel.",
    "7. The method according to claim 1, wherein in step (e), the pressurizing and sending are carried out through an injection skid.",
    "8. The method according to claim 7, wherein a pumping pressure of each reservoir is at least 300 psi.",
    "9. The method according to claim 1, wherein in step (f), the penetration of the chemical product is carried out through an injection or production string.",
    "10. The method according to claim 1, wherein the chemical product will be pumped from a container in alignment with a production or injection well and stored in the container in a reservoir condition.",
    "11. The method according to claim 1, wherein each wellhead is located between sea level and a mud line below the sea level."
  ],
  "description_excerpt": "The present invention pertains to the field of oil recovery, more precisely in the field of product storage, and refers to a method for storing chemical products or their solutions in reservoir rock.\n\nCurrently, chemical treatments to be carried out remotely had limited capacity of storing chemical products, whether in operations at the maritime unit itself or with WSSV (well stimulation submarine vessel) type vessels. With the need of using volumes of chemical products above the storage capacity of the maritime platforms, it was necessary to develop a method to expand the capacity thereof and thus of treatment. This is mainly motivated by actions aimed at increasing oil recovery (e.g., RES20) when using improved recovery methods that adopt the use of high treatment volumetries. The method will allow the necessary treatment volumes to be expanded by storing the product in the reservoir rock itself. This will make it possible to increase the recovery factor (EOR) in reservoir technology, or chemical treatments to guarantee flow.\n\nIn previous interventions, the volumetry was limited by the receiving and storage capacity of the operational unit caused by: design limitations in relation to the storage area for chemical products, lack of sufficient tankage for high consumption products and limited crane capacity. There would be a need to hire extra service vessels to store the volume of product.",
  "cpc": [
    "E21B 43/166",
    "B65G 5/00",
    "C09K 8/52",
    "C09K 8/584",
    "E21B 37/06",
    "E21B 41/0007",
    "E21B 43/01",
    "E21B 43/017",
    "E21B 43/16"
  ],
  "ipc": [
    "C09K 8/584",
    "E21B 43/017",
    "E21B 43/16"
  ],
  "assignees": [
    "Petroleo Brasileiro SA Petrobras"
  ],
  "inventors": [
    "Fernando Antonio Moreira Da Silva",
    "Mario Germino Ferreira Da Silva"
  ],
  "filing_date": "2023-11-08",
  "publication_date": "2025-04-29",
  "grant_date": "2025-04-29",
  "priority_date": "2022-11-09",
  "application_number": "US-202318504935-A",
  "family_id": "90927278",
  "cited_by_count": 0,
  "citations": [
    "CA2147079C",
    "US20120261117A1",
    "US20150060075A1",
    "US20170210973A1",
    "US10570715B2",
    "US20220042403A1",
    "US20210371726A1",
    "US20230183549A1",
    "US20240068332A1"
  ]
}