Complex automation system of hydrat formation ihybitor distribution and dosage

FIELD: oil-and-gas production.

SUBSTANCE: invention related to oil-and-gas production meant for control of inhibitor supply into natural gas streams, for prevention hydraling process in it. The system consists of pump with drive, pressure collector, pipeline for inhibitor withdrawal from collector, pressure stabilisation independent loops, one of which formed with pressure control instrument in pressure collector, its outlet connected with frequency transformer automatic controller, which its outlet connected with pump drive. The second stabilisation loop forms direct action pressure control block, included in group of withdrawal devices between pressure collector and production devices.

EFFECT: broadening of inhibitor streams control system functionality, supplied through independently controlled canals in every point.

1 dwg

 

The present invention relates to gas industries and is intended to control the flow rate of supplied inhibitor in the flow of natural gas to alert them of the process of hydrate formation.

Task flow inhibitors for oil and gas industry has become particularly important now, when the time came for the exploitation of old gas condensate fields, such as Urengoy, Yamburg, which has developed its capacity to 60-70 percent. Gas wells in these fields more than the newly developed subject to flooding of the bottom zone, the removal of moisture in the gas gathering network.

When this occurs, the lowering of the gas temperature, which leads to the formation of hydrates in wells, gas gathering network fishery, plumes and technological devices.

Gas hydrate mode when the field is one of the most negative phenomena causing the emergency situation on the pipelines, wells. This, in turn, requires the use of various measures to prevent hydrate formation process, one of which is the input of the inhibitor in the gas streams.

The inhibition is applying for a special pipeline network inhibitor in the protected sections of pipelines, which can be done according to CNAME ways.

To enter methanol (the most common inhibitor) in the gas stream using either a special methanol capacity (methanolic)or dosing pumps.

Methanolica set slightly above the point of entry inhibitor and tell her how on the bottom and the top of the gas stream so that the methanol gravity can flow into the gas line. Consumption of methanol in this case, adjust manually by means of a needle valve or automatically by a signal from the electric contact pressure gauge measuring the pressure of gas in the pipeline. The disadvantage of this method is the frequent periodic maintenance and replenishment of methanol capacity, which is problematic in the Northern fields, especially in winter.

When using dosing pumps methanol in each point serves your pump (self-dosing). The flow control is thus carried out manually change the performance of dosing pumps.

Dosed feed pumps at each point using pumps ND domestic production, or when using a multidrop dispenser with General electric, for example, multipoint metering units of the company "bran &Lubbe".

The disadvantage of this method is the high cost of equipment for dosiro the project, and that individual dosing requires considerable effort by the Park service pumping equipment, because the number of input points in one gas gathering network is approximately 100, and on the other hand is a complex and expensive equipment. All these factors determined the limited application of the method.

How centralized filing of the inhibitor from the electric pump unit large capacity, overlying the total flow on all entry points, into a common header with subsequent distribution of it has been most widespread in the domestic fields.

It is known, for example, a device controlling the supply of hydrate inhibitor in the pipelines in A.S. No. 1393901, which contains a natural gas gathering system from the wells to the installation of complex gas treatment plant (GTP) through pipelines. The system also includes a centralized point of origin hydrate inhibitors such as methanol, which provides a supply from the pump unit through the collector to the input points in the pipeline. On each supply line of the inhibitor to the point of entry installed electrically operated on / off valves connected to the control device. The disadvantage of this system (prototype) is that the distribution of flow for many who kanalni devices with independent channels regulated supply for each channel, the excess pumped fluid is required to discharge to the receiving container, which is energetically feasible, because it implies a constant pumping units a great performance at full capacity.

The aim of the invention is to eliminate this drawback, and the technical result is an extension of system functionality flow control inhibitor supplied by independent managed channels to each point.

This goal is achieved by the fact that in the proposed system of functionally integrated technical tools for centralized injection of the inhibitor to the execution units, and means providing a given mode of discharge for excessive operating pressure in the supply system and distribution of the inhibitor.

The drawing shows a diagram of the proposed system, which contains:

one or more pumping units (item 1) actuator (2)engaged in the supply of inhibitor in the common header (3);

- battery pressure (pos.4)installed on the discharge line of the pump to smooth out pulsations in the work units to a common header;

- gauge pressure (5) for General collector (3), the output of which is fed to the PID controller is converted into the isolates frequency (pos.6), regulating the speed of the actuator (5);

pressure control direct acting type to itself (pos.7), whose input is connected to the discharge line high pressure, and the output from discharge line low pressure;

pressure control direct acting type "after" (pos.8)connected between a common collector (3) and actuators (position 9) submission of an inhibitor on the production equipment (10) and providing a valid differential pressure group metering valves feed inhibitor in technological devices, the pressure which is considerably lower than the total pressure feeder;

- operated actuator units entry inhibitor (pos.11)installed at the entrances of individual metroprolol (pos.12)feeding methanol in gas wells (POS);

- unmanaged distribution units inhibitor between wells Bush (POS)connected to the outputs of metroprolol (pos.12);

- control device (POS), managing Executive valves To1...Ton(position 9, 11). Valves To1...Tonprovide dosing of inhibitor in the protected point, and control of the valves is carried out by the control block entry inhibitor according to the set program time-pulse method, in which the valve, there is a first restrictive orifice, opens the specified time.

Valves To2.1...To2.nprovide dosing of inhibitor on the well clusters or individually per well. The valves are also controlled by the control block entry inhibitor (POS). The flow inhibitor between wells Bush, no external power supply and remote control, is carried out by means of actuators (POS)can be configured on a given flow rate for each well by hand and automatically maintain a given ratio of expenses when the pressure change in the overall pipeline.

The system works as follows.

The inhibitor of the receiving tank is supplied electric pump unit in the common manifold pressure which stabilizes the automatic control loop "pressure sensor - inverter - drive pump" using built-in PID controller in the frequency Converter. The pressure in the reservoir is maintained at a given Rassdue to the automatic speed control actuator pump units.

To protect equipment and piping in transient regimes of regulation of the pressure in the supply system, manifold pressure set pressure regulator, direct acting with greater rapidly Sodeistvie and providing for the discharge of fluid from the reservoir to the inlet line of the pump at the time of overshoot.

Stable pressure in the injection system inhibitor is distributed over the input points. The accuracy of a given flow at each point is provided by the flow regulator of direct action that is installed on the selected line between the collector and discharge the Executive valves. The pressure regulator maintains the desired pressure differential for actuating devices (valves).

Adjusting knob (item 8) provides the required pressure P1in a wide range, which gives the system the flexibility for use in various technological mode of the object gas.

If the pressure at the point of entry P2higher than the pressure P1the inhibitor injection is made directly from the common header with stabilized pressure P.

The combination of the proposed devices and their interconnections allow the flow inhibitor and efficiently manage its value at each point or group of points with minimal consumption of energy and resources pumping equipment.

1. Complex automated system of distribution and dosage hydrate inhibitors containing a pump unit with electric discharge manifold, piping selection of an inhibitor of the collector, characterized in that it contains the independent contours of pressure stabilization, one of which is formed by the pressure sensor in the pressure reservoir, the output of which is connected to the automatic controller of the frequency Converter, and the output of the latter is connected to the electric pump unit, the second circuit stabilization pressure forms a unit of pressure regulators direct action included in the group of selected devices between the pressure manifold and Executive devices.

2. The system according to claim 1, characterized in that it contains a pressure regulator after itself, forming together with the actuators one managed device group, providing inhibitor to protect the point of the process equipment for a given algorithm and program.

3. The system according to claim 1, characterized in that it contains a group of actuators that provide direct driven software flow inhibitor on the well pad from the common header.

4. The system according to claim 1, characterized in that it contains on each supply line of the inhibitor on the Bush adjustable device that allows the flow of the inhibitor between wells Bush in accordance with individual setting for each well and maintains the set value of differential pressure.



 

Same patents:

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The invention relates to the oil industry and can be used in the system of collection and treatment of oil, gas and water industries

FIELD: oil-and-gas production.

SUBSTANCE: invention related to oil-and-gas production meant for control of inhibitor supply into natural gas streams, for prevention hydraling process in it. The system consists of pump with drive, pressure collector, pipeline for inhibitor withdrawal from collector, pressure stabilisation independent loops, one of which formed with pressure control instrument in pressure collector, its outlet connected with frequency transformer automatic controller, which its outlet connected with pump drive. The second stabilisation loop forms direct action pressure control block, included in group of withdrawal devices between pressure collector and production devices.

EFFECT: broadening of inhibitor streams control system functionality, supplied through independently controlled canals in every point.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: well cluster includes at least two wells. Each well includes underground operating equipment containing cutout valve and wellhead equipment having casing head, tubing head on which there mounted is X-tree including shutoff members - master and side gate valves. Well cluster is connected to control station of actuators of shutoff members, which is made in the form of a cabinet. Control station includes power lines of function control of shutoff members' actuators. In addition, control lines of loop and flare gate valves are mounted in the cabinet. Loop and flare gate valves are installed on pipelines in close proximity to control cabinet, for example on one common frame.

EFFECT: reducing the surface area occupied with the equipment and increasing cluster operating safety.

12 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: single wells or wells forming clusters are drilled; production wells are equipped with wellhead equipment with X-tree including at least one side gate valve and one master gate valve, as well as underground cutout valve and throttle valve and monitoring and control members, which are installed on the loop, for example, fuse strip and gas line pressure monitoring valve. Operation of the well is performed at simultaneous control of production processes of hydrocarbons by means of the station. Control processes involve opening and closing of shutoff-control valves of well cluster by independent supply of working medium to actuators of shutoff-control valves, as well as flare and loop gate valves, which are arranged on pipelines in close proximity to control cabinet, for example on one common frame with control cabinet. Opening of shutoff-control valves of each well is performed in the following way: underground cutout valve, master gate valve, loop gate valve, side gate valve; closing is performed in the reverse order.

EFFECT: improving operating reliability of shutoff-control valves.

3 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: opening and closing of shutoff-control valves of well cluster is performed by independent supply of working medium to actuators of shutoff-control valves and underground cutout valves in the specified sequence, as well as valves controlling the flow rate of each well. Method is implemented by means of control station mounted in the cabinet and including instrumentation and control, as well as hydraulic system. Hydraulic system includes pneumatic hydraulic pressure accumulators combined with working medium tank, pumps, pressure controls and multiplying gears, and has the possibility of controlling actuators of shutoff-control valves with time delay and in certain sequence. At that, in addition, control lines of loop and flare gate valves are mounted in cabinet of the station, which are installed on pipelines in close proximity to control cabinet, for example on one common frame.

EFFECT: invention simplifies mineral deposit production control process, as well as allows reducing the area occupied with process equipment.

21 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: well of hydrocarbon raw material deposit, either gas one or gas-condensate one, includes production string with tubing string with underground operating equipment. Operating equipment includes at least a cutout valve with remote control, which is provided with an actuator, and well head with wellhead equipment. Wellhead equipment comprises casing head, tubing head on which there mounted is X-tree in the form of a fir tree, which includes shutoff members - master and side gate valves with actuators, as well as throttle valve adjacent to the latter, which controls the well flow rate and is provided with an actuator, and monitoring and control members - fuse insert and gas line pressure monitoring valve. Well is connected to control station by means of shutoff members, throttle valve and cutout valve. Control station is made in the form of a cabinet and includes pump accumulator plant and at least one control unit per well.

EFFECT: improving reliability and accident-free operation of gas well and simplifying the control of processes.

12 cl, 5 dwg

FIELD: oil and gas production.

SUBSTANCE: system for use in the hole includes the string designed for location in the hole that consists of submersible electric pump, the first part of inductive coupler and completion section. Note that completion section is located in the well zone under development and includes the second part of inductive coupler, isolating packer, detection cable and electric device electrically connected to the second part of inductive coupler. Note that detection cable goes through the packer for provision of sensors to some well zones.

EFFECT: increase of system operation efficiency and collection of measurement data referred to the well characteristics.

28 cl, 7 dwg

Cutoff valve // 2484236

FIELD: oil and gas industry.

SUBSTANCE: cutoff valve consists of a body connected to a pipeline by means of a flange connection, a thread, a quick-detachable connection, a bayonet connection; a seat of the valve in the form of plane, a cone from elastic material or that combined with metal, plastic; a shutoff element in the form of a ball, a plate; a conical or a flattened cylindrical multi-sided prism from material with density that is higher than that of oil or oil products and lower than water density or in combination with light-alloy material; a guide and a cell from metal, elastic plastic or their combination with a thrust against the housing on elastic surface, which is spring-loaded, or their combination. In the tank on the suction line of individual liquid pumping-out pipelines there installed are at least two cutoff valves at different levels. Besides, on individual liquid pumping-out pipelines there installed are liquid pressure sensors, which are electrically connected to a pumping-out control automation system.

EFFECT: improving reliability of separation of two-phase liquids; simplifying the design.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: needle valve for pressure gage contains a body (1) connected indirectly to rod (2) equipped with threaded seat (3) at one end. At that in the body (1) there is ball seal valve (10) of chevron-type, main bush (9). The latter one is connected to the body by means of a connecting element 12. Besides, the body (1) is connected by means of threaded joint to fastening element (5), which is connected by circular grooves and locking ring with rod (2). Besides body (1) is equipped with bleed-off valve (15).

EFFECT: improving accuracy of pressure gage readings, tightness, durability and reliability of design.

3 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: multiple downhole tools can be driven between operating positions. Downhole tools are connected to a variety of multitapped modules, at that each multitapped module is connected usually to one or downhole tools. Control lines are connected to multitapped modules, and multitapped modules are capable to control downhole tool in bigger quantity than quantity of control lines. Each downhole tool is driven individually delivering pressure through one or several control lines.

EFFECT: facilitating control over multiple downhole tools.

23 cl, 25 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil industry and can be used for operation of flowing gas and oil wells. This device consists of the case fitted in discharge pipe axial channel while male adapter with lengthwise grooves and needle holder is fitted in said case. Case opposite side is equipped with barrel provided with circular ledges to make a circular chamber with said case. Said chamber accommodates spring-loaded circular piston with end valve resting on seat at circular ledge end face. Circular piston and end valve make with the case the circular chamber communicated hydraulically via several bores in the case body with circular channel between said case and discharge pipe. Pusher is arranged inside circular chamber to rest on circular piston and equipped with holder with nozzle pressed by the nut to make a sliding joint with needle holder. Barrel body has radial bores for connection of circular chamber under circular piston with the barrel axial channel overlapped at initial position of end valve body. Said barrel is equipped with adjusting nut for spring hold down. Circular chamber between said barrel and pusher is communicated by drain bore with barrel axial channel.

EFFECT: lower hydraulic drag, higher reliability of structure.

2 dwg

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