BR-102021009961-B1 - SYSTEM AND METHOD FOR UTILIZING DESULFED INJECTION WATER FROM OFFSHORE PLATFORMS FOR USE IN INHIBITION SQUEEZE TANKS

Abstract

SYSTEM AND METHOD FOR UTILIZING DESULFED INJECTION WATER FROM OFFSHORE PLATFORMS FOR USE IN INHIBITION SQUEEZES. The present invention provides a system and a method for utilizing desulfated injection water from offshore platforms for use in inhibition squeeze operations. The system is capable of increasing treatment capacity by combining the pumping system of the stimulation vessel with the water injection system of the offshore platform. In the initial treatment stage, according to the method of this invention, the fluid containing the inhibitor is pumped exclusively by the vessel, followed by an aqueous overflush, where the injection water is mixed with part of the inhibitor cushion pumped by the stimulation vessel.

Inventors

• FERNANDO ANTONIO MOREIRA DA SILVA
• FABIO ANTONIO TEIXEIRA SABOIA FILHO
• Rosane Alves Fontes
• Stefan SUAREZ FERREIRA
• Francisca Ferreira do Rosário
• Patricia Braga Gusmão
• PAULO HENRIQUE DE AMORIM MARTINS

Assignees

• Petróleo Brasileiro S.A. - Petrobras

Dates

Publication Date

20260317

Application Date

20210521

Claims (8)

1. 1- SYSTEM FOR UTILIZING DESULFED INJECTION WATER FROM OFFSHORE PLATFORMS IN INHIBITION SQUEEZES, characterized by comprising: a production well (01); a pig launcher or receiver (02) upstream of the production well (01); a first connection (03) upstream of the pig launcher or receiver (02); a T-connection (09) upstream of the first connection (03), the T-connection (09) configured to receive inhibitor fluid and desulfurized injection water; a first check valve (10) and a second check valve (08), respectively, upstream of the T-connection (09); a hose (11) upstream of the first check valve (10), the hose (11) configured to supply the inhibitor fluid to the T-connection (09) via the first check valve (10); a second connection (04) upstream of the second check valve (08); a throttling valve (05) upstream of the second connection (04) a water flow meter (06) upstream of the throttling valve (05); a desulfated water injection pipe (07) upstream of the water flow meter (06), the desulfurized water injection pipe (07) configured to supply the desulfurized injection water to the T connection (09) via the water flow meter (06), the throttling valve (05), the second connection (04) and the second check valve (08); , and lines.(C) connecting, respectively, the T connection (09) to the first connection (03), the first check valve (10) to the T connection (09), the hose (11) to the first check valve (10), the second check valve (08) to the T connection (09) and the second connection (04) to the second check valve (08).
2. 2- SYSTEM FOR UTILIZING DESULFED INJECTION WATER FROM OFFSHORE PLATFORMS IN INHIBITION SQUEEZES, according to claim 1, characterized in that the inhibitor fluid is pumped from a stimulation vessel, the desulfurized injection water is water injected from an offshore platform, and the T-connection (09) is configured to provide a mixture of the pumped fluid and the injected water to the production well (01) through the first connection (03) and the Pig launcher or receiver (02).
3. 3- SYSTEM FOR UTILIZING DESULFATE INJECTION WATER FROM OFFSHORE PLATFORMS IN INHIBITION SQUEEZES, according to claim 1 or 2, characterized by further comprising a reel downstream of the throttling valve (05) for injecting acidification treatments.
4. 4- SYSTEM FOR USING DESULFED INJECTION WATER FROM OFFSHORE PLATFORMS IN INHIBITION SQUEEZES, according to any one of claims 1 to 3, characterized in that the T-connection (09) is configured to simultaneously receive the inhibitor fluid and desulfurized injection water with controlled flow rates.
5. 5- SYSTEM FOR UTILIZING DESULFED INJECTION WATER FROM OFFSHORE PLATFORMS IN INHIBITION SQUEEZES, according to any one of claims 1 to 4, characterized in that the T-connection (09) is formed by a set of valves.
6. 6- SYSTEM FOR UTILIZING DESULFED INJECTION WATER FROM OFFSHORE PLATFORMS IN INHIBITION SQUEEZES, according to any one of claims 1 to 5, characterized in that the inhibitor fluid is a fluid pumped from a boat, the desulfurized injection water is injected from a water injection system, the first check valve (10) is configured to prevent the pumped fluid from returning to the hose (11), and the second check valve (08) is configured to prevent the injected water from returning to the water injection system, so that the first check valve (10) and the second check valve (08) prevent overpressurization of both the water injection system and the fluid pumped from the boat.
7. 7- SYSTEM FOR UTILIZING DESULFED INJECTION WATER FROM OFFSHORE PLATFORMS IN INHIBITION SQUEEZES, according to any one of claims 1 to 6, characterized by the water flow meter (06) and the throttling valve (05) being configured to control a flow rate of desulfurized injection water from the desulfurized injection pipe (07), and the injection flow rate of the inhibitor fluid treatment cushion being controlled by the pumping system of the stimulation boat.
8. 8- METHOD FOR UTILIZING DESULFED INJECTION WATER FROM OFFSHORE PLATFORMS IN INHIBITION SQUEEZES, using the system as defined in claim 1, characterized in the initial treatment stage the inhibitor fluid is pumped exclusively by the stimulation boat to the production well (01), followed by an aqueous overflush, where the desulfurized injection water is mixed with part of the inhibitor cushion in the production well (01).

Description

Field of Invention [0001] The present invention falls within the field of remote inhibition treatments in oil wells, being based on the development of a solution to allow increasing the total volume of treatment, in order to obtain a longer treatment time, with a reduction in the number of annual interventions and well shutdowns. Description of the State of the Art [0002] Stimulation vessels are typically used in fouling inhibition operations in oil wells. The ability to prepare aqueous solutions used in the treatment is limited by the availability of industrial water that can be transported by this type of vessel. [0003] Remote inhibition treatments in wells with high water production flow rates (> 1000 m3/d) require high-volume invasion treatments (>5,000 bbl) to allow minimum efficiency to be achieved (duration of the effectiveness of the squeeze-applied scale inhibitor of 6 months or more). When there is insufficient industrial water volume, it is necessary to supplement the invasion with diesel, a comparatively much more expensive fluid. [0004] One of the biggest problems involving seawater injection as a secondary oil recovery method is the formation of scale due to salt precipitation (scaling). In most reservoirs, formation water contains alkaline cations such as calcium, strontium, and barium. Divalent sulfate anions (SO4-2) present in seawater combine with these cations, forming precipitates. These precipitates are highly insoluble, especially barium sulfate, and are also adherent and difficult to remove mechanically. The accumulation of precipitates in the reservoir hinders fluid flow, compromising well productivity. [0005] In addition to problems related to fouling, the presence of sulfate can cause the growth of sulfate-reducing bacteria (SRB), which produce hydrogen sulfide (H2S). H2S is an extremely toxic and corrosive agent and, when present, implies additional treatment steps in the processing of oil and natural gas, as well as requiring the installation of additional safety systems. Thus, the presence of sulfate in seawater can result in numerous types of operational problems, in addition to increased costs related to treatment. [0006] The best option to minimize damage caused by sulfate is its removal before injecting seawater into the reservoir. Removal should be done in such a way that sulfate ions are selectively removed, while the salinity of the injection water should be partially maintained to preserve the stability of the reservoir rock. [0007] Laboratory studies conducted in this work have enabled the use of desulfated water for diluting the inhibitor product. Thus, with the availability of desulfated injection water in a power plant, this can guarantee larger treatment volumes with savings in industrial water and diesel. [0008] Document WO2018234559A1 discloses a system and method for using a ship for seawater injection. The ship can be fitted with multiple modules to establish a readily available "connect and produce" link to hydrocarbon production equipment. [0009] According to WO2018234559A1, modules can be installed for seawater processing and injection, support facilities, utilities, and piping, such as a flexible pipe around a coil of tubing. The vessel can be moved to a location, the pipe can be connected from the vessel to the production equipment, and the vessel can be moved a distance from the production equipment with the pipe to be laid. The vessel can be anchored to the seabed and does not need to be powered or have thrusters for positioning. Ballast can be attached along the flexible pipe to lower its position towards the seabed, so as to allow supplies and other containers to pass safely between them. [0010] Despite performing water injection, document WO2018234559A1 is restricted to water supply only by the ship, limiting the volumetric capacity of the operation. [0011] Document WO2007024383A2 discloses a method and associated device for hydrocarbon production. The method describes connecting several wells to a stimulation fluid pumping system via a pumping system manifold. The pumping system manifold is adjusted to provide a first flow path of the stimulation fluid pumping system to a first well. Then, a first stimulation treatment is pumped to the first well. Concurrently with the pumping of the first stimulation treatment, a second well is prepared for a second stimulation treatment. [0012] Document WO2007024383A2 differs from the present invention by not employing the junction of the boat's pumping systems and the offshore platform's water injection system. [0013] Document WO2006088372A1 discloses a system and method for intervening in subsea oil and gas wells, comprising a surface vessel, or drilling rig, with equipment for handling and controlling a connecting cable for drilling tools, and also a system for supplying and returning drilling fluid, where the connecting cable for the drilling tool descends into an effective borehole of a subsea well, and where a