CN220647880U - Novel water injection reflux production system - Google Patents

Abstract

The utility model discloses a novel water injection backflow production system, which comprises a pipeline for connecting a water injection manifold with a production manifold, wherein an emergency shut-off valve, a first isolation ball valve, a flowmeter, a throttle valve, a second isolation ball valve and a third isolation ball valve are sequentially arranged on the pipeline from the water injection manifold to the production manifold, a first pressure relief valve is arranged between the emergency shut-off valve and the first isolation ball valve, and a second pressure relief valve is arranged between the second isolation ball valve and the third isolation ball valve. According to the utility model, a high-temperature high-pressure water source of the water injection manifold is throttled and depressurized by a throttle valve to be connected into the oil well production manifold, and is mixed with oil well production logistics to enter a crude oil treatment process for temperature raising, so that the crude oil dehydration efficiency is improved in the initial stage of production, and the contradiction between the large-discharge design and the low water injection requirement of a sewage system and a water injection system is solved; in the middle period of development, the problem that the dewatering is influenced by the emulsification inversion point of crude oil is solved, and in the middle and later periods of development, the transition period from single pump operation to multi-pump operation of a water injection pump is solved.

Description

Novel water injection reflux production system

Technical Field

The utility model relates to the technical field of water injection development of oil fields, in particular to a novel water injection backflow production system.

Background

When offshore oil field is put into production in the initial stage, only partial oil-water wells are put into production at the stage, most development wells and adjustment wells are put into production successively through drilling and completion operations after put into production, the water content of the oil wells is low at the stage, the number of water injection wells is small, the injection allocation amount is low, and the following three-point problems can occur to the production flow at the stage:

1) The displacement design of the water injection pump is designed as the full life cycle design of an oil field, the general displacement is larger, the contradiction between the large displacement and the small water injection requirement of the water injection pump can occur during the displacement design, the water injection pump returns to the water injection buffer tank through the self-backflow flow, the tank body temperature of the water injection buffer tank is increased continuously, the water injection pump is high Wen Tingbeng, and in addition, the water injection pump operates under the working condition of high lift and low displacement for a long time to cause certain damage to the pump body;

2) Because the water content of the oil well is low in the stage, the receiving material flow of the production separator (primary separator) of the central processing platform is basically crude oil and natural gas, and the water treatment amount is small, the temperature of the production separator is low, the dehydration effect is poor, and the fluctuation of the water content of the output is large;

3) In this stage, the load of the sewage system is small, and in order to ensure the requirements of water output and water injection in the oil field, the sewage system needs to be put into use, so that the treatment flow of the sewage system is difficult to regulate and control in this stage.

When the oil field is developed to the middle stage, the comprehensive water content of the oil field is gradually increased, the process flow is greatly burdened at the stage when the comprehensive water content of the oil field gradually reaches the vicinity of the crude oil emulsification reverse point, the dehydration effect of the separators at all stages is rapidly reduced, the water content of the outer transmission pump is increased, meanwhile, the filter screen of the outer transmission pump is frequently blocked, and more workload is increased to the site.

When the oil field is developed to the middle and later stages, the comprehensive water content of the oil well is gradually increased at the middle and later stages, the production sewage and the water injection quantity are gradually increased, the discharge capacity of a single water injection pump cannot meet the water injection requirement, a second water injection pump is required to be started, and the unmatched phenomenon that the discharge capacity of the water injection pump is far greater than the water injection requirement still occurs at the initial stage of starting the second water injection pump, so that the phenomenon of high Wen Tingbeng is caused.

In addition, a platform with high wax content and high condensation point and needing water mixing and external transportation is required, and because of poor crude oil physical properties, a wellhead platform with high condensation point and needing water mixing and external transportation is required to ensure the stable operation of a sea pipe, the platform is generally designed with a water mixing flow, the geothermal water is pressurized to the sea pipe for external transportation by a water mixing pump to be mixed with crude oil for water mixing and external transportation, and the water mixing flow becomes a core flow of the oil field, meanwhile, the contradiction between the water injection demand quantity and the design displacement of a water injection pump at the initial production stage is more prominent, and the problems of high Wen Tingbeng of the water injection pump, machine sealing thorn leakage and the like cannot be solved by utilizing the existing production flow.

Disclosure of Invention

The purpose of the present application is to provide a novel water injection and backflow production system, so as to solve the problem set forth in the above background technology.

In order to achieve the above purpose, the present application provides the following technical solutions:

the utility model provides a novel water injection backward flow production system, is including the pipeline that is used for connecting water injection manifold and production manifold, be equipped with emergent shut-off valve, first isolation ball valve, flowmeter, choke valve, second isolation ball valve and third isolation ball valve in proper order to the production manifold direction by water injection manifold on the pipeline, be equipped with first relief valve between emergent shut-off valve and the first isolation ball valve, be equipped with the second relief valve between second isolation ball valve and the third isolation ball valve.

Further, a check valve is arranged between the throttle valve and the second isolation ball valve.

Further, the flowmeter is a mass flowmeter.

Further, the throttle valve is a cage type throttle valve.

Further, the first pressure relief valve and the second pressure relief valve are low-point discharge valves.

Further, the single flow valve is a butt clamp type single flow valve.

In summary, the utility model has the technical effects and advantages that: according to the utility model, a high-temperature high-pressure water source of the water injection manifold is throttled and depressurized by the throttle valve to be connected into the oil well production manifold, and is mixed with oil well production logistics to enter a crude oil treatment process for temperature raising, so that the process load of sewage and a water injection system is improved, the safe and stable operation of the production process is ensured, a flowmeter is added in the process design to realize accurate regulation, and the noise and vibration generated by high-pressure throttling can be reduced by using the cage type throttle valve, so that the safe production is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a novel water injection reflow production system in accordance with an embodiment of the present utility model.

1, an emergency shutoff valve; 2. a first isolation ball valve; 3. a flow meter; 4. a throttle valve; 5. a second isolation ball valve; 6. a third isolation ball valve; 7. a first pressure relief valve; 8. the second pressure relief valve; 9. a single flow valve; 10. a valve seven; 11. a valve eight; 12. a valve nine; 13. and a valve ten.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

This embodiment provides a novel water injection backward flow production system, and this embodiment can be applicable to the newly-built platform in sea, put into production oil field flow transformation and the defeated water injection development oil field of water entrainment, as shown in fig. 1, including the pipeline that is used for connecting water injection manifold and production manifold, be equipped with emergent shutoff valve 1, first isolation ball valve 2, flowmeter 3, choke valve 4, second isolation ball valve 5 and third isolation ball valve 6 in proper order by water injection manifold to production manifold orientation on the pipeline, be equipped with first relief valve 7 between emergent shutoff valve 1 and the first isolation ball valve 2, be equipped with second relief valve 8 between second isolation ball valve 5 and the third isolation ball valve 6. In this embodiment, the water injection manifold and the production manifold are already the current production processes which are common for offshore oil and gas fields, and the design of the water injection reflux production process in this embodiment adopts a double ball valve and emptying isolation mode to perform process isolation according to the design standard of the offshore platform production process, and an emergency shut-off valve 1 is arranged between a crude oil system and a water treatment system.

The main working principle is as follows: accurately regulating and separating a part of water source from a high-temperature and high-pressure water injection manifold water source through a throttle valve 4 and a flowmeter 3, and enabling the water source to enter a production manifold and an oil well production stream to enter a crude oil treatment process; in the abnormal situation, the emergency shutoff valve 1 is automatically closed through the ESD system, the material flow is intercepted, the emergency shutoff valves 1 at two ends of the pipeline, the first isolation ball valve 2, the second isolation ball valve 5 and the third isolation ball valve 6 can be closed when the production system is required to be checked and maintained, and the pressure release through the first pressure release valve 7 and the second pressure release valve 8 realizes the isolation mode of double interception and discharge, so that the effective energy isolation is ensured.

Further, a check valve 9 is arranged between the throttle valve 4 and the second isolating ball valve 5. In the embodiment, the design of the check valve 9 is added, so that the production manifold oil gas is prevented from being returned to the string, and the safety of the production process is further improved.

Further, the flowmeter 3 is a mass flowmeter. The accuracy of on-site regulation and control can be realized through the mass flowmeter. The flowmeter 3 of this application can use oil field water injection well with the type flowmeter, guarantees the commonality of spare parts, installs according to flowmeter 3 installation standard strictly simultaneously, ensures flowmeter 3's accuracy, and its signal transmission can be according to on-the-spot actual demand on-the-spot reading or be connected to central control room and gather.

Further, the throttle valve 4 is a cage type throttle valve. The adoption of the cage-type throttle valve is suitable for the adjustment under high pressure difference, has the characteristics of low noise, small vibration and accurate regulation and control, and further improves the operability of the production process. The cage type throttle valve can be replaced by a throttle valve with the same function and effect.

Further, the first pressure relief valve 7 and the second pressure relief valve 8 are low-point discharge valves. The check valve 9 is a butt clamp check valve. The connecting pipeline material is the same as the water injection manifold material, and the connecting pipeline material is required to be executed according to the petroleum and natural gas industry standard, so that the welding process is ensured, and the pipeline stress accords with the industry standard. The check valve 9 is required to use a qualified product which meets the pressure level and the same function. The process is required to be reasonably distributed according to the industrial standard, has the operation space for inspection and maintenance, is firm in welding of the pipeline bracket, and increases heat preservation and heat tracing according to the regional characteristics. The pressure grades of the pipeline, the emergency shutoff valve 1, the first isolation ball valve 2, the flowmeter 3, the throttle valve 4, the check valve 9, the second isolation ball valve 5, the third isolation ball valve 6, the first pressure relief valve 7 and the second pressure relief valve 8 are selected to be higher pressure grades of the production manifold and the water injection manifold.

For newly-built construction platform, can be according to the design of figure 1 flow construction, the utility model discloses flow pipeline and use material valve isopiestic pressure grade to select production manifold and water injection manifold higher pressure grade to be as standard, the pipeline flange of same material will be emergent shut-off valve 1, first isolation ball valve 2, flowmeter 3, choke valve 4, uniflow valve 9, second isolation ball valve 5, third isolation ball valve 6, first relief valve 7 and second relief valve 8 are connected to the oil well production manifold according to the flow.

For the production oil field, in fig. 1, except the pipeline and the components on the pipeline, other pipelines and components which are already arranged and used in the prior art are added, in order to increase the pipeline to realize the connection of the production manifold and the water injection manifold, a tee joint can be added between a valve seven 10 and a valve eight 11 in fig. 1, the tee joint is connected with the upstream of the emergency shut-off valve 1, a 2 inch ball valve is added to the upstream of the valve eight 11 to serve as an isolation valve, a tee joint is added between a valve nine 12 and a valve ten 13 of the production manifold, the tee joint is connected with the downstream of the third isolation ball valve 6, and a 2 inch ball valve is added to the downstream of the valve nine 12 to serve as an isolation valve.

After the connection is completed, the operation conditions are provided by the work such as water pressure, air tightness, inerting, debugging, authentication and the like. The operation steps of the on-site commissioning according to the flow demand are as follows:

1) Checking and confirming that the first pressure relief valve 7 and the second pressure relief valve 8 are in a closed state and confirming whether a blind plug or a blind plate is complete (between the emergency shut-off valve 1 and the first isolation ball valve 2, between the second isolation ball valve 5 and the third isolation ball valve 6);

2) The cage type throttle valve is in a closed state;

3) The third isolation ball valve 6, the second isolation ball valve 5, the first isolation ball valve 2 and the emergency shut-off valve 1 are slowly and sequentially opened;

4) According to the flow demand, the flow is controlled through a cage-type throttle valve, and the actual reflux flow is observed through a mass flowmeter;

5) The reflux flow is regulated and controlled to the required flow to lock the cage type throttle valve lock pin;

6) Periodically inspecting according to an oilfield inspection system;

7) When the process is abnormal, when the production manifold and the water injection manifold trigger high/low pressure or the production shutdown is triggered on site or the emergency situation is triggered on the above, the emergency shutdown valve 1 is automatically closed through the ESD system, so that the emergency shutdown of the process is ensured, risks such as leakage and high pressure are reduced, the first isolation ball valve 2, the second isolation ball valve 5 and the third isolation ball valve 6 are sequentially closed on site according to actual conditions, and the pressure is released through the first pressure release valve 7 and the second pressure release valve 8, so that the process is isolated by double cutoff and discharge;

8) When the process is stopped, the cage type throttle valve is manually and slowly closed, the reflux flow is regulated to 0, the emergency shutoff valve 1, the first isolation ball valve 2, the second isolation ball valve 5 and the third isolation ball valve 6 are sequentially closed, and the pressure is released through the first pressure release valve 7 and the second pressure release valve 8, so that the double-cutoff and discharge is realized, and the process is isolated.

The main function of this embodiment is: in the initial stage of oil field production, the water content of the oil field is low, so that the heat energy of a high-temperature water source can be fully utilized, the temperature of a crude oil production process is increased, the crude oil dehydration efficiency is improved, the chemical agent injection concentration is reduced, the water injection source after heat exchange is changed into a sewage treatment system and a water injection system, the minimum treatment capacity of the sewage and the water injection system is ensured, and the contradiction between the large discharge capacity and the small water injection requirement of a water injection pump is solved; in the middle of oil field development, the comprehensive water content of the oil field gradually rises, the comprehensive water content processed by the crude oil processing system is near a crude oil emulsification reverse point, the problems of difficult dehydration of the crude oil processing system, high water output and frequent cleaning of a field operator filter screen can be caused, water injection can be introduced into the crude oil processing flow through the novel water injection reflux production flow, the comprehensive water content processed by the crude oil processing system spans the crude oil emulsification reverse point, the dehydration efficiency is improved, and the water output and the workload of the field operator are reduced; in the middle and later stages of oil field development, production sewage gradually rises, and the water injection system can smoothly pass the conversion period from a single water injection pump to a plurality of water injection pumps simultaneously through the design flow.

To sum up, this embodiment will be injected the high temperature high pressure water source of water manifold and pass through choke valve throttle depressurization and insert oil well production manifold, mix with oil well production commodity circulation and get into crude oil treatment flow together and carry out the temperature, promote sewage and water injection system flow load, guarantee the safe and stable operation of production flow, increased the flowmeter and realized accurate regulation and control in the flow design, use cage-type choke valve can reduce high pressure throttle production noise and vibration, ensure safe production. The production flow design flow process is simple, the construction amount is small, the manufacturing cost is low, the safe and stable operation of a crude oil dehydration system, a production sewage treatment system, a water injection system, a water mixing system and the like can be effectively ensured, and the production cost is effectively reduced.

Finally, it should be noted that: the foregoing description of the preferred embodiments of the present utility model is not intended to be limiting, but rather, it will be apparent to those skilled in the art that the foregoing description of the preferred embodiments of the present utility model can be modified or equivalents can be substituted for some of the features thereof, and any modification, equivalent substitution, improvement or the like that is within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (6)

1. Novel water injection reflux production system, its characterized in that: the emergency shutoff valve is connected with the first isolation ball valve through a tee joint, and the second isolation ball valve is connected with the third isolation ball valve through a tee joint.

2. The novel water injection and backflow production system according to claim 1, wherein a check valve is arranged between the throttle valve and the second isolation ball valve.

3. The novel water injection and backflow production system according to claim 1, wherein the flowmeter is a mass flowmeter.

4. The novel water injection and backflow production system according to claim 1, wherein the throttle valve is a cage type throttle valve.

5. The novel water injection and backflow production system of claim 1, wherein the first pressure relief valve and the second pressure relief valve are low-point discharge valves.

6. The novel water injection and backflow production system according to claim 2, wherein the check valve is a butt clamp check valve.