RU44349U1 - INTERPLAST WATER TRANSMISSION DEVICE AND DEPTH WELL DOWN CONVERTER OF COSTS FOR THIS DEVICE - Google Patents

Abstract

INTERDISPLAST WATER TRANSMISSION DEVICE (UHMW) AND DEPTH WELL DOWN FLOW CONVERTER (GSPR) for this device belong to the oil industry and can be used in reservoir pressure maintenance systems for the development of oil and gas fields.

The UMPV device consists of a string of 2 tubing with a downhole pump unit in the form of a multi-stage centrifugal pump 3 with a submersible motor 4, a power cable 5, a ground unit 6 for power supply, control and monitoring, a packer 7 for uncoupling the layers (transmitting and receiving), downhole node 10 to ensure a minimum content of solids and downhole flow transducer 11 flow.

GSPR consists of a composite flow housing 16 with two channels, a flow rotator 19 and a flow rectifier 21, between which a mountain-shaped annular groove 23 is made, in which the ball 24 and the node 25 for controlling the circular movements of the ball along the annular mountain groove are placed. New in the device is the presence in it of the above elements and their relationships.

New in the downhole flow transducer is the execution of the housing is composite, in the form of at least two parts, the outer part 26 of which contains a seat saddle 27 under the insert, with the possibility of installation and removal, the central part 28. In the body of the outer part 26 is placed the latch 29 mutually conjugate state of both parts. The rotator 19 and the flow rectifier 21 are rigidly fixed to the insert part of the housing 28, and the annular groove 23 is made in the body of the outer part 26 directly above the landing seat 27. 2 N. P.F., 3 ill.

Description

The devices belong to the oil industry and can be used in reservoir pressure maintenance systems in the development of oil and gas fields.

For the effective development of oil and gas fields, devices are known [1] that implement a method of maintaining reservoir pressure by injecting a certain amount of a displacing agent, mainly water (fresh, marine, sewage or formation), from the surface into separate points of the formation through injection wells. The current reservoir pressure maintenance system (PPM) includes: a water source, low-pressure (feed) water conduits, a second-lift pumping station, a cluster pumping station, injection wells, a set of instruments for measuring injected water volumes.

With the deep development of oil fields to intensify oil production, there is a need to commission additional injection wells, and, consequently, periodically reconstruct the pressure maintenance systems, which is an expensive undertaking.

Note the following disadvantages of PPD systems with the above technical equipment:

- the use of pumps of high performance and pressure;

- the need to build high voltage power lines and step-down substations in connection with the use of high-voltage electric motors as pump drives;

- a significant length of land high-pressure pipelines;

- the bulkiness of the system, high metal and capital intensity;

2 - low operational reliability of the system.

Also known are devices [2] that implement the PPD method by pumping water into an injection well from a pit drilled specially near it into which an electric centrifugal pump (ESP) has been lowered. Sewage or fresh water is supplied to the ESP through the low pressure conduit, and the outlet of the ESP installation is connected to the injection well. A device that implements the PPD method by pumping water through a specially organized pit is free from most of the drawbacks, but nonetheless, capital costs for the construction of a pit are mandatory.

The closest technical solution (prototype) to the inventive device for inter-reservoir water pumping is a device [3] for maintaining reservoir pressure by pumping water downhole using an electric centrifugal pump from a completely flooded (spent) productive reservoir and delivering it to an operating oil-saturated reservoir containing, as described , well, multistage centrifugal pump with submersible motor, packer for appropriate separation and sealing of the wellbore (borehole space) and ensuring reception (absorption) of fluid by the receiving formation from the outlet of the centrifugal pump, the inlet of which is connected to the wellbore in the zone of the water-giving formation.

This device is free from the above disadvantages, but it does not solve the problem of accounting for the pumped formation water and ensuring its quality in terms of the content of solids, which is required by the regulatory and technical documents for the exploitation of hydrocarbon deposits using the technology of maintaining reservoir pressure (RPM).

Thus, the purpose of the claimed objects (otherwise the required technical result) is to provide these objects more

high consumer properties, namely: providing them during operation (inter-reservoir pumping of water to maintain the pressure of the oil reservoir) mandatory accounting for the volume of pumped water and the content of solids.

As experimental work shows, the goal (required technical result) is achieved by the fact that the known device for inter-reservoir pumping of produced water, containing, according to the prototype, a well, a tubing string with a downhole pump unit in the form of a multi-stage centrifugal pump with a submersible electric motor, power cable, ground power supply unit, control and monitoring, packer for separation of the wellbore between the giving and receiving water layers moreover, the pump inlet is hydraulically in communication with the first of these layers, and the outlet with the second, equipped with an downhole assembly to ensure a minimum content of mechanical impurities, a downhole flow transducer (that is, water flow into a sequence of information electrical signals) and a ground unit for calculating the flow, content of mechanical impurities and metering the amount of water, as well as the wired telecommunication channel between them, while the ground-based unit for calculating the flow rate, the content of solids and metering the amount of water electrically with It is also connected to the power supply, control and monitoring unit.

The problem of choosing a flow meter for the purpose of monitoring (measuring) the volume of the pumped liquid (water) without extracting it to the surface is far from trivial and due to the fact that such flow meters must meet the following criteria:

1. MTBF failure time must be at least the MTBF of the downhole equipment (pump and electric motor);

2. The most simple scheme for picking up an electric signal from the output of the primary converter and processing it to obtain information on the surface about the volume of the pumped liquid. To one degree or another, these two criteria are satisfied by tachometric flow meters, common to which is the measurement of the speed of the moving element, which is used to judge the flow rate, and the quantity (volume or mass) of the passed substance is judged by the number of revolutions or moves. Tachometric flow meters primarily include turbine and ball flow meters [4].

The sensitive element of the turbine meter is an axial (axial) turbine with blades located at an angle to the direction of fluid flow and freely rotating on bearings. The rotation speed of the turbine is directly proportional to the flow rate and, consequently, to the flow rate of the passing fluid, and its number of revolutions for a certain period to the volume of fluid that has passed over this period [4].

The main disadvantage of the primary transducers of turbine flow meters is that the turbines of the transducers block the bore of the pipeline, as a result of which hydraulic shocks are difficult to perceive, which in turn accelerate the destruction of the turbine blades and the wear of bearings. In addition, the turbine blades, being an obstacle to the moving flow, can become clogged by foreign bodies, which also affects the reliability of the turbines, up to their jamming.

A movable element of a ball flow meter is a ball that rotates under the action of a stream of a measured substance swirling in a special way. The rotation frequency of the ball, which is directly proportional to the flow rate, is converted into an informational electric signal by either an induction or inductive, or magnetically controlled contact (reed switch), etc.

Ball flow meters are free from the above disadvantages inherent in the primary converters (sensors) of turbine flow meters and fully satisfy the criteria:

increased reliability (MTBF) and the maximum ease of removal and processing of an electrical information signal proportional to consumption.

Comparison of turbine and ball flow meters clearly shows the superiority of ball flow meters over turbine ones.

Thus, it is ball flowmeter flow meters that are more preferable than others for operation in a well paired with an electric centrifugal pump, but existing ground-based structures, of course, require substantial improvement to adapt them to borehole operating conditions as part of an inter-reservoir water transfer device.

In the part of the downhole borehole flow transducer for the inter-reservoir water transfer device, the required technical result is ensured by the fact that in the deep borehole flow transducer of the inter-reservoir water pumping device containing a composite flow housing with a central axial and annular coaxial measuring channels, a flow rotator with radial oblique blades located at an angle to the incoming water flow, at the outlet of this channel is installed flow straightener with radial straight blades, between the rotator and flow straightener there is a mountain-shaped annular groove in which the ball is placed with the possibility of rolling along its surface, as well as a control unit for the circular movements of the ball along this annular groove, the body is made in the form of at least two parts, the outer of which contains a landing seat under the plug-in, with the possibility of installation and removal, the central part of the body, in the body of the outer part of the body

a latch for the mutually conjugate state of both parts is placed, the rotator and the flow straightener are rigidly fixed to the insert part of the housing, and the annular groove is made in the body of the outer part directly above the landing seat, while the geometric generatrix of the surface of the annular groove is half the circular arc with the ends of this arc lying on a straight line, not parallel to the axis of the housing and intersecting with this axis behind the flow rectifier.

The required technical result is ensured by the presence of the essential features in both sets (characterizing the proposed design of the inter-reservoir water pumping device and the design of the downhole flow transducer) of the above distinctive features, and the non-detection in public sources of patent and technical information of equivalent technical solutions with the same properties with undoubted industrial applicability and novelty implies compliance of the claimed objects with the criteria of “useful models. "

The drawings show a schematic (figure 1) diagram of an inter-reservoir water pumping device to maintain the pressure of oil-saturated formations and the design, respectively, figure 2, of a downhole downhole flow transducer for this device; the figure 3 shows a fragment of the sweep of the flow rotator with radial oblique blades.

The inter-reservoir water pumping device according to FIG. 1 contains a well 1, a column 2 of tubing and tubing (Tubing) suspended in its trunk, a multistage centrifugal pump 3 with a submersible motor 4, which is provided with electricity through a power cable 5 from the ground block 6 power supply, management and control. As part of the downhole equipment suspension, there is a packer 7 for separating the wellbore 1 between its wall and the tubing string 2, then

there is to break the hydraulic connection between the giving and receiving water layers (the latter are shown in figure 1, but are not indicated by individual positions). The input 8 of the pump 3 is hydraulically connected to the supply (aquifer) formation, and the output 9 of this pump is connected to the formation into which water is pumped, that is, with the receiving (absorbing) one. In front of the pump inlet at a certain distance (in height) from the tubing string, a node 10 for ensuring a minimum content of mechanical impurities and a downhole water flow converter 11 are located. The structure of the object includes a ground block 12 for calculating the flow rate, the content of solids and metering the amount of water, electrically, through a wire channel 13, connected to the sensors 14 of the node 10 for ensuring the minimum content of solids and with a downhole flow transducer, while the block 12 is also electrically connected to unit 6 of power supply, control and monitoring of the submersible motor 4 by the communication channel 15 for de-energizing the engine 4 in emergency situations on command from block 6.

Device inter-reservoir pumping works as follows. In an aquifer selected as a source of water supply or in a completely irrigated waste productive (oil) reservoir, work is underway to ensure sufficient water inflow. Assembly of downhole equipment (including the tubing string, multistage centrifugal pump with a submersible electric motor, assembly 10 to ensure the minimum content of mechanical impurities (sand trap) with sensors 14 for filling it with sand, a deep water flow transducer and a packer) is placed in the wellbore, while providing electrical wire communication and power supply of the sensors, flow transducer and submersible motor with ground blocks 6 and 12. Packer 7 seals the annular space of the wellbore s between the casing wall

columns and tubing string above the water receiving formation and begin pumping water. At the same time, water entering the well with mechanical impurities in the form, mainly, of small particles of formation rock initially enters the sand trap [5] of a well-known design, where it accumulates, and water is pumped through the tubing string into the under-packer space of the well and absorbed ( under pressure of a multistage centrifugal pump) by the receiving reservoir. Since the cavity of the sand trap is monitored by sensors for filling it with sand in height, and the volumes of this filling are initially known, it is not difficult to determine the content of solids in the source water with constant consideration of the pumped water for some time, assuming that the sand trap works with maximum efficiency . Moreover, if the actual content of solids exceeds the norm (0.1 g / l norm), then additional measures and means for downhole water treatment, or a decrease in the rate of its withdrawal from the reservoir, are necessary; the latter reduces the mechanical destruction of the rock constituting the aquifer. Upon receipt of a signal about the maximum filling of the sand trap with mechanical impurities, it is necessary to replace it, that is, technological shutdown of the well. The electrical connection of unit 6 and 12 provides for an automatic shutdown of water injection to protect the pumping unit from abnormal operation and to protect the productive receiving formation from clogging with mechanical impurities by turning off the engine and issuing an appropriate signal to the operator service.

The downhole downstream flow transducer (see figure 2) for an inter-reservoir water pumping device comprises a composite flow-through housing 16 with a central axial (position 17) and annular coaxial measuring (position 18) channels. At the inlet of the measuring channel 18, a flow rotator 19 is installed with radial oblique blades 20 located at an angle to the incoming flow

water (as shown in figure 3), and at the outlet of this channel a flow rectifier 21 with radial straight vanes 22 is installed. Between the rotator 19 and flow rectifier 21 there is a mountainous annular groove 23 in which the ball 24 is placed, and behind the groove, in the body building 1, placed node 25 control the circular movements of the ball, connected by electrical connection with the ground unit 12 for calculating the flow rate, the content of solids and accounting for the amount of pumped water. The flow-through housing 16 is made of at least two parts, the outer part 26 of which contains a seat saddle 27 under the plug-in, with the possibility of installation and removal, the central part 28 of the housing 16. In the body of the outer part 26 is placed a latch 29 of the mutually conjugate state of both parts . The rotator 19 and the flow rectifier 21 are rigidly fixed to the insertable central part 28 of the housing, and the annular groove 23 is made in the body of the outer part 26 directly above the landing seat 27, while the geometric generatrix of the surface of the annular groove is half the circular arc with the ends of this arc (points A and B in figure 2) lying on a straight line “a-b”, not parallel to the axis 0-0 of the body and intersecting (ibid., Point K) with this axis behind the flow rectifier 21.

The downhole flow transducer operates as follows. Since the well above the packer 7 is filled with water from the delivery reservoir and water is received (input) of the multistage centrifugal pump through the flowing housing 16 of the downhole transducer, a part of the flow of water sucked by the pump goes through the central axial channel 17, and some part of the water is twisted by a rotator 19 of the flow, goes along the measuring coaxial annular channel 18, entraining the ball 24 in a circular rolling motion along the mountainous annular groove 23, the more intense the higher (more) the flow rate. The angular velocity (rotational speed) of the ball is a measure of the flow of water through the measuring channel, and the total

(total) water flow through the transducer 11 is determined from the ratio of the throughput of both channels, the flow in one of which is measured according to the well-known principle for tachometric ball flow meters. A feature of the claimed design is that the ball in the mountainous annular groove is always in point contact with its surface, which ensures high sensitivity of the transducer to the presence of flow through the body, the absence of undesirable collisions and contacts of the ball when it is rolling with surfaces available, for example, in known ball flowmeter designs, as well as the fact that, if necessary, it is possible to extract and the amena of the plug-in central part of the casing to a similar one with a flow rotator having other parameters of the flow swirl angle or another section of the measuring channel; it is possible to replace the ball 24 with another one of the same, or more massive, or lightweight, or from other materials.

It should be noted that the design shown in figure 2 is designed to measure the flow of water (or any other liquid) when it moves from top to bottom and the ball is made of wear-resistant material with a density close to or slightly higher than the density of the liquid; to measure the liquid flow with the direction “from the bottom up”, the density of the ball material should be slightly lower than the density of the liquid, and the body of the flow transducer should naturally be turned upside down by 180 degrees.

Based on the foregoing, the declared objects, united by a common creative concept and designed to solve one common technical problem, may, in the applicant's opinion, be protected by the relevant RF security document in accordance with the statement to the materials.

Sources of information taken into account when compiling the descriptions:

1. Sereda N.G., Sakharov V.A., Timashev A.N. Satellite oilman and gasman. M., Nedra, 1986.

2. Kaplan L.S. Improving the technology of pumping water into the reservoir. / Oil industry. - 2001. - No. 7 - p. 49-50

3. Ashirov K.B. About the problem of oil recovery. / Oil industry. -1991. -№3- s. 17-19

4. Abramov G.S., Barychev A.V., Zimin M.I. Practical flow measurement in industry. M., JSC "VNIIOENG", 2000. -p.104-149

5. Muravyov V.M. The satellite of the oilman. M., Nedra, 1977 .-- p. 207, 208, Fig. 60.

Claims (2)

1. The device of inter-reservoir water pumping, comprising a well, a tubing string with a downhole pump unit in the form of a multi-stage centrifugal pump with a submersible electric motor, a power cable, a ground-based power supply, control and monitoring unit, a packer for uncoupling the wellbore between the water supplying and receiving water layers, and the pump inlet is hydraulically in communication with the first of these layers, and the output with the second, characterized in that it is equipped with an downhole support unit the minimum content of mechanical impurities, a downhole downstream flow transducer (i.e. water flow into a sequence of information electrical signals) with a ground unit for calculating the flow, content of the mechanical impurities and accounting for the amount of water, as well as a wired telecommunication channel between them, while the ground unit for calculating the flow, the content of solids and metering the amount of water is also electrically connected to the power supply, control and monitoring unit. 2. A downhole borehole flow transducer for inter-reservoir water pumping device, comprising a composite flow housing with a central axial and annular coaxial measuring channels, and a flow rotator with radial oblique blades located at an angle to the incoming water flow at the outlet of this channel is installed at the inlet of the measuring channel a flow straightener with radial straight blades is installed, a toroidal annular groove is made between the rotator and the flow straightener, in which it is possible the ball is placed on its surface along the surface of the ball, as well as a control unit for the circular movements of the ball along this annular groove, characterized in that the body is made in the form of at least two parts, the outer of which contains a seat seat under the plug-in, with the possibility of installation and the detachment, the central part of the body, in the body of the outer part of the body there is a latch for the mutually conjugate state of both parts, the rotator and flow rectifier are rigidly fixed to the insert part of the body, and the annular groove is made in the body of the outer part directly above the landing saddle, while the geometric generatrix of the surface of the annular groove is half an arc of a circle with the ends of this arc lying on a straight line not parallel to the axis of the housing and intersecting with this axis behind the flow rectifier.