Skid system for oil production (PO) and gas-lift (GL) lines, and methods for commissioning a po / GL skid

Abstract

The present invention relates to a system for producing oil using trunklines and PO / GL skids comprising: an in-line tee for the gas-lift trunkline (ILT GL); an in-line tee for the oil production trunkline (ILT PO); at least two PO / GL skids; at least two wet Christmas trees (ANM); a gas-lift trunkline (GL); and an oil production trunkline (PO). The present invention also relates to a method for commissioning PO / GL skids via a gas-lift line, which involves the following steps and their respective sub-steps: injecting and circulating diesel; circulating water; and removing the PO / GL skid module. It further relates to a method for commissioning via ROV, which mitigates the need to interrupt gas-lift injection in the other wells of the trunkline and circulate large volumes of water and diesel, and is performed by circulating a flow of MEG.

Description

Skid system for PO and GL lines, and commissioning methods for PO / GL skids. Field of the invention.

[0001] The present invention falls within the technical field of oil and gas production and transportation, especially in offshore exploration operations.

[0002] More specifically, the invention focuses primarily on a system of subsea equipment used in the oil and gas industry. This system features changes aimed at improving the efficiency, safety, and economy of subsea production operations through strategies such as optimizing equipment architecture, flow control, and well monitoring. BACKGROUND OF THE INVENTION

[0003] Skid-type oil production (PO / GL) systems are fundamental for managing the extraction and distribution of oil from the well to the stationary production unit (SPU).

[0004] These PO / GL skid systems play a crucial role in facilitating efficient and safe operation on offshore oil production platforms. By gathering and controlling the flow from oil wells to the FPSO, PO / GL skids help optimize production, minimizing downtime and maximizing oil recovery.

[0005] Furthermore, they ensure process integrity by monitoring and regulating fluid pressures and temperatures throughout the production process. The effective implementation of these systems not only increases productivity but also reduces operational and environmental risks, thus contributing to sustainability and... long-term profitability of oil exploration operations.

[0006] Thus, the technical problem solved by the present invention consists of providing systems that, when commissioning one of the skids connected to a main production line, do not interrupt the overall production of the other wells connected to this line, in addition to providing access, via MQCs, for depressurization and MEG injection operations via ROV.

[0007] There are no prior art documents that address alternatives aimed at: the possibility of commissioning one of the PO / GL skids without the need to interrupt production from the other wells. SUMMARY OF THE INVENTION

[0008] The present invention discloses a PO / GL oil production skid system comprising: • an In-Line Tee for the gas-lift trunkline (ILT GL); • an In-Line Tee for the oil production trunkline (ILT PO); • at least two PO / GL skids; • a gas-lift trunkline (GL); • and an oil production trunkline (PO).

[0009] Furthermore, the present invention also relates to a method for commissioning PO / GL skids via a gas-lift line, which involves the following steps and their respective sub-steps: diesel injection and circulation; water circulation; and removal of the recoverable module from the PO / GL skid.

[0010] It also concerns a commissioning method using ROVs, which mitigates the need to circulate large volumes of water and diesel, and is carried out via circulation with MEG flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will now be described with reference to typical embodiments thereof and with reference to the accompanying drawings, in which:

[0012] Figure 1 is a representation of the state-of-the-art SKID PO / GL system.

[0013] Figure 2 is a representation of the SKID PO / GL system with two SKID PO / GL systems, with both (ANM), with the ILT GL and the ILT PO, according to the present invention.

[0014] Figure 3 is a representation of the SKID PO / GL system according to the present invention.

[0015] Figure 4 is a representation of the completed stage 1 of the commissioning of the SKID PO / GL via gas-lift line according to the present invention.

[0016] Figure 5 is a representation of the completed stage 2 of the commissioning of the SKID PO / GL via gas-lift line according to the present invention.

[0017] Figure 6 is a representation of the completed stage 3 of the commissioning of the SKID PO / GL via gas-lift line according to the present invention.

[0018] Figure 7 is a representation of the commissioning procedure for the PO / GL skid via ROV and MQC access according to the present invention. DETAILED DESCRIPTION OF THE INVENTION SYSTEM ARCHITECTURE

[0019] The present invention proposes a system comprising a PO / GL oil production skid. This type of architecture, when compared to the architecture of the prior art equipment, as shown in Figure 1, presents several advantages, since it connects the PO / GL skid to the FPSO, reducing CAPEX, in addition to decreasing the complexity of the subsea arrangement. However, its main advantage is allowing the commissioning and replacement of the recoverable module of one of the PO / GL skids without interrupting the production of the other wells connected to the trunklines.

[0020] According to Figure 2, the system of the present invention is composed of the following structures: an In-Line Tee for the gas-lift trunkline (ILT GL); an In-Line Tee for the oil production trunkline (ILT P); at least two SKID PO / GL; at least two wet Christmas trees (ANM); a gas-lift trunkline (GL); and an oil production trunkline (PO).

[0021] To achieve the proposed technical effect, the system features resident valves (RVs) in pairs positioned upstream and downstream of the recoverable module, with Multi Quick Connector (MQC) interfaces for ROV access between the valves. The MQC accesses aim to allow for hydrate dissociation by depressurization and leak testing of the resident valve pairs, as well as enabling possible ROV commissioning of the equipment.

[0022] Furthermore, the system features a PO trunkline and a GL trunkline, with two wells interconnected to these trunklines, where the connection of the first well to the In-Line Tee (ILT) equipment is used for trunk lines. In this sense, a PO / GL skid is used for each well, according to the configuration shown in Figure 3.

[0023] In this sense, an In-Line Tee for the gas-lift trunkline (ILT GL) connects the PO / GL skid to a gas-lift trunkline (GL), and an In-Line Tee for the oil production trunkline (ILT PO) connects the PO / GL skid to an oil production trunkline (PO).

[0024] Furthermore, with regard to Figure 2, it is possible to observe the states of the PO / GL SKID valves when the wells are producing normally, as well as the valves of the ANMs and ILTs. For the operation of the PO / GL SKID valves, valves VR-GL1, VR-GL2, VR-GL3, VR-GL4, VR-PO1, VR-PO2, VR-PO3, and VR-PO4 are normally open. The hydraulic valves VH-GL1 and VH-PO1 in the recoverable module of the PO / GL SKID also remain open, as do the valves present in the ILTs and the valves W2, M2, W1, M1, and DHSV of the ANM. Meanwhile, the hydraulic valves VH-GL2 and VH-PO2 of the SKID remain normally closed (opened in case of need for PIG passage), as do the valves of the ANM PXO, XO, S1, and S2. Thus, to perform certain operations, it is necessary to use an ROV to change the status of resident valves (RV). Hydraulic valves (HV) can be operated remotely.

[0025] The valves present in the PO / GL skids are best seen in Figure 3, as well as the connection of the ILTs to the PO and GL trunk lines, and the connection of the PO / GL skids to the ANMs. Furthermore, it should be noted that the PO / GL skid comprises: a Multiphase Meter (MPFM) and a Single-Phase Meter (SPFM). In addition Furthermore, the PO and GL choke modules comprise at least two pairs of pressure and temperature transducers, production chokes, and gas-lift chokes.

[0026] It should be noted that the PO and GL choke modules are recoverable modules, and can be replaced and / or recovered through commissioning of the PO / GL SKIDs.

[0027] Therefore, to allow the uninterrupted operation of the other wells in the system during the replacement of one of the PO / GL skids, three steps must be followed. The procedure must be carried out through the ANM (National Mining Agency), according to the PO / GL skid to be commissioned for the recovery of its module. In this sense, cleaning procedures are carried out with diesel injection and circulation, followed by water circulation to allow the recovery of the PO / GL skid.

[0028] In this regard, the system also includes MQC interfaces between the resident valves (VR), for access by ROV, which can be used for hydrate dissociation (by depressurization) and internal MQCs for leak testing of the resident valves at the inlets of the PO / GL SKIDs.

[0029] The objective is to use these access points to conduct leak testing of the valves, allowing the removal of the recoverable module from the commissioned PO / GL skid without halting production from other wells connected to the trunkline, as well as preventing the formation of hydrates, as will be described in more detail below. COMMISSIONING METHOD VIA GAS-LIFT TRUNKLINE

[0030] The operation of the wells and equipment occurs after the commissioning procedure, initiating production for an existing power plant.

[0031] Initially, consider a situation where, during normal well production, one of the Multiphase Meters stops operating, making its replacement necessary. One of the major advantages of the proposed PO / GL SKID system is that it eliminates the need to interrupt all trunkline production to clean and replace the recoverable module of one of the PO / GL SKIDs.

[0032] Figures 4 to 6 show the commissioning procedure for a PO / GL skid, detailing the states of the valves in the PO / GL skid module and the ANM connected to that module, as cleaning procedures with diesel injection and circulation, followed by water circulation, are conducted to allow the PO / GL skid to be recovered.

[0033] To commission the recoverable module of one of the PO / GL skids via the gas-lift line, it is necessary to interrupt the gas-lift injection through the gas-lift trunk line to all wells connected to it. This means that the remaining wells must produce by flow during the commissioning stages. The diesel and water used in the commissioning stages are injected through the gas-lift line and return through the production line along with the production from the other wells.

[0034] Figures 4 to 6 also show the diesel and water circulation steps for commissioning the PO / GL 1 skid, which receives production from well 1. Volumes should be circulated that, based on experience, guarantee the TOG (total oil and grease content) is in compliance for the removal of the recoverable module from the skid.

[0035] To perform the procedure, as mentioned previously, it is necessary to stop production at the well in question and interrupt the gas lift flow through the well annulus. This procedure will be divided into four stages: stage a) diesel injection and circulation; stage b) diesel circulation; stage c) water and MEG injection and circulation; and stage d) removal and recovery of the recoverable module of the PO / GL skid.

[0036] Thus, step a) comprises the following operations: - via UEP, close valves M1 and M2 on ANM 1, interrupting gas lift and production from Well 1; - via UEP, close valve W2 on ANM 1, interrupting the possibility of fluid circulation through this ANM; - via UEP, close valve M2 on ANM 2, preventing gas lift injection into Well 2; - interrupt the gas lift flow through the GL Trunkline and via UEP inject diesel through this line; - via UEP, open valve XO on ANM 2; - via UEP, close valve VH-GL1 and open valve VH-GL2 on SKID PO / GL 2 (to prevent the circulation of large volumes of diesel through the gas-lift choke); - circulate diesel through the GL line, passing through the ILT-GL to the SKID PO / GL 2 and ANM 2, passing through the W2 – XO – W1 circuit in ANM 2 and returning through the production line, together with the production from Well 2, which is producing by flow;- via UEP, close valves W2 and XO and open valve PXO on ANM 2, allowing diesel cleaning of this section on ANM 2; - via UEP, close valve VH-GL2 and open valve VH-GL1 on SKID PO / GL 2, allowing diesel to pass through to carry the gas in this section of the equipment; - Step a) completed, as shown in Figure 4.

[0037] Next, step b) begins, comprising the following operations: - via UEP, close valve PXO on ANM 2, preventing diesel circulation through this ANM; - via UEP, close valve VH-GL1 and open valve VH-GL2 on SKID PO / GL 1 (to prevent the circulation of large volumes of diesel through the gas-lift choke); - via UEP, open valves W2 and XO on ANM 1, thus allowing diesel circulation for cleaning SKID PO / GL 1 and ANM 1 through the W2 – XO – W1 circuit on ANM 1, returning through the production line to the production header, joining the production coming from Well 2; - via UEP, close valves W2, XO and W1 on ANM 1; - via UEP, open valve PXO on ANM 1, allowing the cleaning of this section of the ANM; - via UEP, close valve VH-GL2 and open valve VH-GL1 on SKID PO / GL 1, allowing diesel to pass through to carry the gas in this section of the equipment; - Step b) completed, as shown in Figure 5.

[0038] In turn, step c) comprises the following operations: - injecting water through the GL Trunkline, passing through the ILT-GL, SKID PO / GL 1, GL line, circulating through ANM 1 via the PXO valve and returning through the production line to the access to the production trunk line in the ILT-P, this water being carried away. Along with the production from Well 1, the PO / GL 1 skid is now filled with water; - via UEP, close the VH-GL1 valve and open the VH-GL2 valve of the PO / GL 1 skid, allowing water circulation through this section of the subsea equipment; - via UEP, close the VH-GL2 valve and open the VH-GL1 valve of the PO / GL 1 skid; - via ROV, close the resident manual valves VR-GL1, VR-GL2, and VR-PO2 on the PO / GL 1 skid; - inject MEG via the MQC access between the VR-PO1 / VR-PO2 manual valves on the PO / GL 1 skid, carrying the water in this section with MEG to the PO Trunkline; - with the section from VR-PO1 of the PO / GL 1 skid to the ILT-P filled with MEG, close the VR-PO1 manual valve via ROV, as shown in Figure 6.

[0039] Finally, step d) comprises the following operations: - perform, through the MQC accesses, the leak test of the resident valve pairs VR-GL1 / VR-GL2 and VR-PO1 / VR-PO2 at the SKID PO / GL 1 inlets; - if the result of these tests is positive, the recoverable module of SKID PO / GL 1 is filled with water and ready to be recovered, as shown in Figure 6. Therefore, recover the recoverable module of SKID PO / GL 1 filled with water. ROV COMMISSIONING METHOD

[0040] The ROV-based commissioning procedure can also be performed for the PO / GL skid in the proposed system. This alternative avoids interrupting the GL injection process. the other wells in the trunk line and also prevents the circulation of large volumes of diesel and water through these lines.

[0041] This alternative allows for the exclusive commissioning of the recoverable module of the PO / GL SKID. Furthermore, the operation involves the use of resident valve pairs and the MQC access points between these valves, with the injection and circulation of MEG volumes via ROV through these MQC access points.

[0042] By using resident valve assemblies and MQC hubs for ROV access between the recoverable SKID PO / GL module and the MCVs (Vertical Connection Module, equipment that allows connection between the flexible pipeline and the subsea equipment), it is possible to commission only the SKID PO / GL to be replaced.Thus, the commissioning of the PO / GL SKID via ROV involves the following operation: - via ROV, close valves VR-GL1, VR-GL4, VR-PO1 and VR-PO4; - via ROV, inject MEG through the MQC accesses between the resident valves VR-GL1 / VR-GL2 and VR-PO3 / VR-PO4; - The MEG flow through the GL line enters through the MQC access between valves VR-GL1 / VR-GL2, passes through the module to carry the gas in this section, exits through the MQC access between valves VR-GL3 / VR-GL4, being collected at this outlet; - via UEP, close valve VH-GL1 and open valve VH-GL2, allowing the gas to be carried by the MEG in this section; - via UEP, close valve VH-GL2 and open valve VH-GL1; - The MEG flow through the module's PO duct enters via the MQC access between valves VR-PO3 / VR-PO4 to carry the oil into the... Inside the module, exit through the MQC access between valves VR-PO2 / VR-PO1; - via UEP, close valve VH-PO1 and open valve VH-PO2, allowing the MEG to carry oil through this section; - via UEP, close valve VH-PO2 and open valve VH-PO1, as shown in Figure 7; - after injecting MEG through the MQC accesses, via ROV close valves VR-GL-2, VR-GL3, VR-PO3 and VR-PO2; - perform leak tests of the 4 pairs of resident valves (VR-GL1 / VR-GL2, VR-GL3 / VR-GL4, VR-PO1 / VR-PO2, VR-PO3 / VR-PO4) of SKID PO / GL 1 via ROV through the MQC interfaces between valves; - via RSV operation, remove the recoverable module from SKID PO / GL with MEG in the pipeline.

Claims

CLAIMS 1. OIL PRODUCTION PO / GL SKID SYSTEM, characterized in that it comprises: an In-Line Tee for the gas-lift trunkline (ILT GL); an In-Line Tee for the oil production trunkline (ILT PO); at least two PO / GL skids; a gas-lift trunkline (GL); and an oil production trunkline (PO).

2. System according to claim 1, characterized in that an In-Line Tee for the gas-lift trunkline (ILT GL) connects the PO / GL skid to a gas-lift trunkline (GL).

3. System according to claim 1, characterized in that an In-Line Tee for the oil production trunkline (ILT PO) connects the PO / GL skid to the oil production trunkline (PO). 4.System, according to claim 1, characterized in that the gas-lift (GL) branch of the SKID PO / GL additionally comprises: a VR-GL1 valve; a VR-GL2 valve; a VR-GL3 valve; a VR-GL4 valve; a VH-GL1 valve; a VH-GL2 valve; a gas-lift choke; a single-phase meter (SPFM); and a pair of pressure and temperature transducers.

5. System according to claim 1, characterized in that the oil production (OP) branch of the SKID PO / GL additionally comprises: a VR-PO1 valve; a VR-PO2 valve; a VR-PO3 valve; a VR-PO4 valve; a VH-PO1 valve; a VH-PO2 valve; an oil production choke; a multiphase meter (MPFM); and a pair of pressure and temperature transducers.

6. System according to any one of claims 1 to 5, characterized in that the VR type valves are actuated by an ROV.

7. METHOD OF COMMISSIONING A SKID PO / GL IN A GAS-LIFT TRUNKLINE SYSTEM, as defined in any one of claims 1 to 6, characterized in that it comprises the following steps: a) diesel injection and circulation; b) diesel circulation; c) water and MEG injection and circulation; ed) removal and commissioning of the recoverable module from the SKID PO / GL. 8.Method, according to claim 7, characterized in that step a) comprises: via UEP, closing valves M1 and M2 in ANM 1, interrupting the gas lift and production of Well 1; via UEP, closing valve W2 of ANM 1, interrupting the possibility of fluid circulation through that ANM;. via UEP, close valve M2 on ANM 2, preventing gas lift injection into Well 2; interrupt the gas lift flow through the GL Trunkline and via UEP inject diesel through this line; via UEP, open valve XO on ANM 2; via UEP, close valve VH-GL1 and open valve VH-GL2 on SKID PO / GL 2 (avoid the circulation of large volumes of diesel through the gas-lift choke); circulate diesel through the GL line, passing through ILT-GL to SKID PO / GL 2 and ANM 2, passing through the W2 – XO – W1 circuit on ANM 2 and returning through the production line, along with the production from Well 2, which is producing by flow; via UEP, close valves W2 and XO and open valve PXO on ANM 2, allowing diesel cleaning of this section on ANM 2; and via UEP, close valve VH-GL2 and open valve VH-GL1 on SKID PO / GL 2, allowing diesel to pass through to carry the gas in this section of the equipment. 9.Method, according to claim 7, characterized in that step b) comprises: via UEP, closing valve PXO in ANM 2, preventing the circulation of diesel through that ANM; via UEP, closing valve VH-GL1 and opening valve VH-GL2 in SKID PO / GL 1 (preventing the circulation of large volumes of diesel through the gas-lift choke); via UEP, opening valves W2 and XO in ANM 1, thus allowing the circulation of diesel for cleaning SKID PO / GL 1 and ANM 1 through the W2 – XO – W1 circuit in that ANM, with return. through the production line to the production header, joining the production coming from Well 2; via UEP, close valves W2, XO and W1 in ANM 1; via UEP, open valve PXO in ANM 1, allowing the cleaning of this section of the ANM; via UEP, close valve VH-GL2 and open valve VH-GL1 in SKID PO / GL 1, allowing the passage of diesel to carry the gas in this section of the equipment.

10. Method, according to claim 7, characterized in that step c) comprises: injecting water through the GL trunkline, passing through ILT-GL, SKID PO / GL 1, GL line, circulating through ANM 1 through valve PXO and returning through the production line to the access to the production trunk line in ILT-P, this water being carried together with the production from Well 1, in which SKID PO / GL 1 is filled with water; Using the UEP, close the VH-GL1 valve and open the VH-GL2 valve of the PO / GL1 skid, allowing water to circulate through this section of the subsea equipment;via UEP, close valve VH-GL2 and open valve VH-GL1 of SKID PO / GL 1; via ROV, close the resident manual valves VR-GL1, VR-GL2 and VR-PO2 on SKID PO / GL 1; inject MEG via MQC access between manual valves VR-PO1 / VR-PO2 on SKID PO / GL 1, carrying MEG to the water in this section up to the PO Trunkline; with the section from VR-PO1 of SKID PO / GL 1 to ILT-P filled with MEG, close manual valve VR-PO1 via ROV.

11. Method, according to claim 7, characterized in that step d) comprises:; 11. A METHOD FOR COMMISSIONING A PO / GL SKID INTO A SYSTEM VIA ROV, as defined in any one of claims 1 to 6, characterized in that it comprises the following steps: via ROV, closing valves VR-GL1, VR-GL4, VR-PO1 and VR-PO4; via ROV, injecting MEG through the MQC accesses between resident valves VR-GL1 / VR-GL2 and VR-PO3 / VR-PO4; where the MEG flow through the GL line enters through the MQC access between valves VR-GL1 / VR-GL2, passes through the module to carry the gas in that section, exits through the MQC access between valves VR-GL3 / VR-GL4, being collected at that outlet; via UEP, close valve VH-GL1 and open valve VH-GL2, allowing the gas to be carried by the MEG in that section; via UEP, close valve VH-GL2 and open valve VH-GL1;The MEG flow through the module's PO duct enters via the MQC access between valves VR-PO3 / VR-PO4 to carry the oil inside the module, exits via the MQC access between valves VR-PO2 / VR-PO1; via UEP, close valve VH-PO1 and open valve VH-PO2, allowing the MEG to carry the oil in this section; via UEP, close valve VH-PO2 and open valve VH-PO1; after the MEG injection through the MQC accesses, via ROV, close valves VR-GL-2, VR-GL3, VR-PO3 and VR-PO2; Perform leak tests on the 4 resident valve pairs (VR-GL1 / VR-GL2, VR-GL3 / VR-GL4, VR-PO1 / VR-PO2, VR-PO3 / VR-PO4) of the PO / GL 1 skid via ROV through the MQC interfaces between valves; via RSV operation, remove the recoverable module from the PO / GL skid with MEG in the piping.

Images