The method of dual use multilayer wells and suction valve for periodic overlapping flow from the reservoir

 

(57) Abstract:

The proposal relates to the production of fluid minerals, in particular can be applied when operating oil or gas wells. Provides an arbitrary choice of the number and location of exposed layers in the multilayered well be simultaneous operation to make full use of the capabilities of each layer. The inventive method: perform selective production of productive layers using established against each reservoir and managed from the wellhead receiving valves. Each valve has two stable position "closed" and "open". Transfer from one position to another is performed by the pressure pulse from the wellhead. Each valve has a threshold. The opening-closing valves reach by consecutive submission of two pulses of pressure to actuate the desired valve and to actuate the next valve that is configured at a lower pressure. Summary of the invention the device: it consists of a body of the valve with receiving holes and springs under face of the valve. At the ends of the spool are made stops. One of them is lying in the slot switching valve includes a notched crown with curved grooves in the housing on the other hand, providing the motion of the spool in the axial direction of its spread. 2 S. p. f-crystals, 2 Il.

The invention relates to the field of fluid extraction of mineral resources, particularly oil, and can be used in the operation of the multilayer wells, as for the separate production of layers and simultaneous.

Known a method of operating a multiple zone well, when the production of the productive layers through a single well bore with single or mixed supply of product to the surface is carried out on separate channels using a special tool, placed in the casing and is equipped with a movable device, by providing the necessary overlap of the apertures of the flow of the product or from any reservoir, or several at the same time [1].

The method has a limit on the number of produced layers due to the limited space (the diameter of the casing), which must be placed in the tool for receiving the product and switch it flows depending on the specific mode of operation of the well. The implementation of the method also requires complex and expensive equipment and is connected with the holding of a significant amount of susceptib golosovoy wells by selective generation of productive layers using established against each reservoir on the production string and managed from the wellhead foster valves [2].

The essence of the method lies in the fact that the choice of the opened reservoir, subject to the operation, carried out by changing the stroke of the downhole pump, the cylinder for which you are lifting tubes, the length of stroke can be installed in any of the intervals from the mouth to the bottom of a well. The regulation of the selection of the product from the reservoir is also produced by changing the stroke of the plunger.

The disadvantage of this method is its lack of flexibility. Arbitrary selection of layers that are subject to exploitation impossible. In addition, the implementation of this method is possible only in conditions of forced exploitation wells, i.e., using deep-well pumps.

The technical result of the invention the method is providing an arbitrary choice of the number and location of exposed layers in the multilayered well be simultaneous operation at any given time, reducing tripping operation when changing the operation mode to make full use of the capabilities of each layer by environmental safety.

Required technical result is achieved in that the method separately, simultaneously to operate the Yves each reservoir on the production string and managed from the wellhead and admission valves, according to the invention, each suction valve has two stable position "closed" and "open", and transfer them from one position to another is performed by the pressure pulse through the discharge of the working medium from the wellhead, with each valve has an individual element that defines the threshold trigger when applying pressure pulse, and the opening-closing of intake valves reach through the consistent supply of two pulse pressure: initial pressure equal to the pressure desired valve, the second pressure equal to the pressure of the next configured to a lower pressure, and if configured to a lower pressure no the second pulse is not available.

In Fig. 1 presents a schematic diagram of the well under the proposed method.

In the well established column 1 pipe, which opened against the productive layers (in this case, layer 4, a, B, C, D) have adopted hydraulic valves 2-5, United with the productive area of the reservoir through the channels 6 (perforation), optionally arranged in several rows vertically. The annulus 7 is sealed between layers of packers 8. The flow of the working medium which changes the mode of operation of the well: change the number of existing layers or replacement of the involved layers new - management is carried out by feeding to the column pulse pressure equal to or slightly larger in magnitude threshold of the valve that must be translated into a new state.

Assume, in accordance with Fig. 1 valve 2-5 set the threshold equal to P1> P2> P3> P4> P5. In the initial state, the valves are all closed and the flow rate is equal to 0. In accordance with the current strategy of production of layers well you need to open the layers: B and D, while maintaining closed the layers a and B. To do this, the string of pipe 1 create pressure Pn= P2> P3> P4when the valves 2-4 open. To close the valve 3 serves another pulse is equal to Pn= 3, but it is closed and the valve 4 as Pn> P4. To open the valve 4, as required by a given mode of operation of the well, you must give one pulse is equal to Pn= P4.

Thus, by changing the pressure in the column in accordance with the threshold pressure of the valve, you can choose any combination of operating and closed valves, regardless of the total number installed on the well. And thus provide the most blugaria the La implementation of the above method of operating a multi-layer wells proposes a new device valve.

Known for the design of the spool valve, consisting of a set on the production string of casing, comprising interconnected upper and lower tubular sections, the lower of which made reception side channels [3] . Inside the sectional casing along its axis moves the bushing (valve) that regulates the screening area of the lateral channels between fully open and fully closed positions. Fixing the sleeve in a predetermined position and moving it to produce special devices controlled from the wellhead.

The disadvantage of this design is its excessive mechanical complexity, which reduces the reliability and complicates the operation. For use in the operation of the multilayer wells this design is not suitable because it does not provide any choice of the layer, designed for power at any given time.

The closest analogue of the invention in the portion of the device is a suction valve for periodic overlapping flow from reservoirs, consisting of a body, which is part of the production string, spool with receiving holes and springs installed under Tim's work well in the course of its operation, in particular to stop production of one of the reservoirs or for commissioning of the new layer, you need to spend a long and laborious tripping operation, as the control mechanism to move the valve bushing contains a complex mechanical components and replacement parts. Thus the efficiency of the operation control of the well is lost.

The technical result of the invention of the device is the creation of an independent flexible operational system management admission valves for the optimal operation of multireservoir well. Known solutions for valves unacceptable for the implementation of this proposal. The result is achieved that, on the receiving channel for periodic overlapping flow from reservoirs, consisting of a body, which is part of the production string, spool with receiving holes and springs installed under face of the valve, according to the invention, to provide two stable positions "open" and "closed" at the ends of the spool are made stops, one of which is in a stable position valve is in the slot in the crown case with two successively alternating in the housing, and the emphasis the other end of the spool when the switching valve is notched crown with curved grooves in the housing on the other hand, providing the motion of the spool in the axial direction of its spread.

The valve design shown in Fig. 2 (longitudinal section). The valve consists of a housing 1 with receiving holes 2, which is part of the casing 3, the spool 4 with receiving holes 5 and the cylindrical spring 6 that is installed under face of the valve. On both ends of the spool are made stops 8, one of which 7 in the mounted position is notched crown 9 in the housing 1 with two sequential depth views of the slots 10 and 11 (deep view). The stop 8 and the other end of the spool 4 when the switching valve is notched crown 12. The grooves of the crown 12 have a curved profile (B scan), so when the movement of the slide 4 along an axis is his turn.

The operation of the valve is as follows (Fig. 2). Starting position - valve open (steady - open), fluid from the reservoir flows into the well under pressure Ppthrough holes 2 and 5, which are combined and further along the production string 3 is transported to the surface is agenie closed the decommissioning of the reservoir) in the production casing from the ground surface standard hydraulic pump pump working environment with the discharge pressure Pn> Pp. Under the influence of this pressure, which exceeds the threshold of the spool 4, is compressed spring 6, its lugs 7 extend from the slots 10, and the lugs 8 are curved grooves of the crown 12 and along these grooves deploy the valve at a given angle. In addition to the translational and rotational motions of the spool occupies a new position relative to the valve body, guaranteeing full offset holes 5 in relation holes 2 as the axis of the valve and its radius. When this stops 7 are against deep grooves 11. Produce a discharge pressure to a value below the threshold of the spring valve. The spool 4 is moved under the action of the spring 6 along the axis of the valve, it stops 7 enter the grooves 11 (deep) crown 9 and fix the valve is in the second stable position. The flow of liquid from the reservoir ceased.

The proposed valve device allows to implement proposed in paragraph 1 a method of operating a multiple zone well and provide the most flexible and, therefore, the most optimal production opened her seams.

The proposed solution allows you to create flexible independent system operation m the but conduct independent research on the state of the reservoir at any time, the number of produced layers is not limited and is completely eliminated mutual hydrodynamic effect layers, another important advantage of the new solution is the complete elimination of tedious and time-tripping accompanying any change in the operating modes of the multilayer wells traditional methods, such as selective movement of the valve collet gripping mechanisms.

The undoubted advantage of this proposal is the improvement of the ecological situation in the area of the fishery as it eliminates the need for periodic disclosure of the wellhead and extraction from it of oil-contaminated items.

Especially it should be noted that the declining oil reserves and the need for oil on the coastal shelves with floating platforms helps to prevent global ecological catastrophes.

When approaching storm the crew is practically absent the necessary time tripping operation for closing of intake valves. The proposed technical resegotti pouring oil into the sea in case of a break in the storm columns.

Sources of information

1. US 3509941 A, 05.05.1970.

2. SU 791948 A, 30.12.1980.

3. US 5211241, A, 18.05.1993.

4. SU 907225, A, 23.02.1982.

1. Way to simultaneously separate operation multilayer wells by selective generation of productive layers using established against each reservoir on the production string and managed from the wellhead of intake valves, wherein each intake valve has two stable position "closed" and "open", and transfer them from one position to another is performed by the pressure pulse through the discharge of the working medium from the wellhead, with each valve has an individual element that defines the threshold trigger when applying pressure pulse, and the opening-closing of intake valves reach through the consistent supply of two pulse pressure: the first is the pressure equal to the pressure desired valve, the second pressure equal to the pressure of the next configured to a lower pressure, and if configured on the less pressure there is, the second pulse is not available.

2. Suction valve for periodic overlapping flow from reservoirs, consisting of a body, Adoram valve, characterized in that to provide two stable positions "open" and "closed" at the ends of the spool are made stops, one of which is in a stable position valve is in the slot in the crown case with two sequential depth types of grooves, which determines the state of the shift Bolotnikova holes in relation to the holes in the body and focus the other end of the spool when the switching valve is notched crown with curved grooves in the housing on the other hand, providing the motion of the spool in the axial direction of its spread.

 

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FIELD: oil and gas extractive industry.

SUBSTANCE: valve has body of steel, throttling assembly, locking assembly with ball and saddle for it. Between locking and throttling assemblies resilient impenetrable wall separating these is mounted fixedly with possible interconnection via U-shaped, turned by its knee upwards, tubular channel, with inner diameter greater than ball diameter, having two branches directed downwards and having various lengths. Elongated pipe branch is connected through open end fixedly placed on wall to hollow of body throttling assembly. Short branch end is placed above wall and is within hollow of locking assembly. Short branch pipe is extended above the knee for distance greater than ball diameter. It is made in form of branch pipe with closed upper end, forming a hollow - tank with stopping device for placement and holding of ball therein in starting position. Ball can possibly fall freely under its own wait in downward direction onto saddle if released by stop as a result of effect from outside force from cementing plug at the end of cementation.

EFFECT: higher reliability, better quality.

7 cl, 8 dwg

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