CN204476375U - Intelligent water injection device - Google Patents

Abstract

The utility model discloses an intelligent water injection device, which comprises a driving part, a sliding cavity, a piston part, a water injection part and a shift adjustment part, the driving part drives the piston part to reciprocate along the sliding cavity, and the piston part It includes a central pipe, on which several water injection holes arranged in the axial direction are arranged, and the water injection part is provided with water through holes, and the water injection holes and the water injection holes are changed through the shift operation of the shift adjustment part. The number of connected water through holes is used to control the water injection flow rate of the device. The water injection flow rate of the intelligent water injection device of the utility model can be adjusted according to the water absorption index of the formation without fishing operation, which improves the water injection efficiency and reduces the cost of the water injection process; Applicable to inclined wells and horizontal wells.

Description

Intelligent water injection device

technical field

The utility model relates to an intelligent water injection device, especially an intelligent water injection device suitable for stratified water injection in inclined wells and horizontal wells.

Background technique

In the downhole environment of oil extraction, it is necessary to press the oil out through water injection. The water injection techniques currently used are: general water injection and layered water injection.

In general water injection, each layer is injected with the same flow rate. Due to geological reasons, the water absorption index of each stratum is different, and the filling time will not be uniform when using this method. Therefore, there are fewer and fewer oil wells using this method, and the direction of layered water injection is gradually developed.

In layered water injection, water is injected into different formations at different flow rates through downhole tools such as water distributors. During the water injection process, it is necessary to carry out trial injection of water to each layer, that is, first select a water nozzle with a certain flow rate, and if the water injection effect is found to be unsatisfactory, then replace the water nozzle according to the situation. This method is mainly applied to vertical wells. Due to the structure of inclined wells, the success rate of the operation of replacing water nozzles is very low, and it cannot be used for horizontal wells; therefore, this method is not suitable for inclined wells and horizontal wells.

Utility model content

The purpose of the utility model is to provide an intelligent water injection device which is easy to use and can be applied to various oil wells. The specific technical scheme is as follows:

An intelligent water injection device, comprising a driving part, a sliding chamber, a piston part, a water injection part and a shift adjustment part, the driving part drives the piston part to reciprocate along the sliding chamber, the piston part includes a central pipe, the The central pipe is provided with several water injection holes arranged in the axial direction, the water injection part is provided with a water passage hole, and the water injection hole and the water passage hole are changed through the shift operation of the shift adjustment part. The number of connections controls the water injection flow of the device.

Further, the driving part includes a hydraulic driving part and a return spring; the hydraulic driving part is a hydraulic cavity formed by the inner wall of the sealing cylinder, the outer wall of the central pipe, the boss provided on the outer wall of the central pipe, and the sealing assembly. The upper pipe hole enters the hydraulic chamber and pushes the piston down; the return spring pushes the piston up.

Further, the sliding cavity is composed of an upper joint, a sealing cylinder, a pressure cap, a connecting head, a sleeve, a drive sleeve and a lower joint; the upper joint, sealing cylinder, pressure cap, connecting head, sleeve and the lower joint are sequentially passed through Threaded connection, where the joints of the pressure cap, joint head and sleeve are sealed by sealing components, and the other joints are sealed by "O" rings.

Further, the piston part is composed of a central tube and a sealing assembly.

Further, the sealing assembly adopts a combined sealing form of a retaining ring, a "V" seal and an "O" seal.

Further, the water injection part is composed of an upper joint, a central pipe and a connecting head 7 .

Further, several rows of water injection holes arranged in the axial direction are evenly distributed in the circumferential direction on the central pipe.

Further, the shift adjustment part is composed of a sliding pin, a driving sleeve and a central tube; the central tube is provided with a track groove for shifting gears; the sliding pin is installed inside the driving sleeve, and the sliding pin The protruding end slides in the track groove.

Further, the track grooves on the central pipe are composed of several limit track grooves and corresponding shift track grooves; the number of limit track grooves is the same as the number of rows of water injection holes on the central tube.

The water injection flow rate of the intelligent water injection device of the utility model can be adjusted according to the water absorption index of the formation without fishing operation, which improves the water injection efficiency and reduces the cost of the water injection process; the device is not only suitable for single layer, but also for multi-layer water injection, and Applicable to inclined wells and horizontal wells.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment 1;

Figure 2 is a schematic diagram of the structure of the track groove on the central tube of the present invention;

Fig. 3 is a structural schematic diagram of Embodiment 2 of the utility model;

In the figure: 1. Control pipeline; 2. Upper joint; 3. Center pipe; 4. Seal assembly; 5. Seal cylinder; 6. Pressure cap; 7. Connector; 8. Sleeve; 9. Drive sleeve; 10. Sliding pin; 11. Lower joint; 12. Return spring.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described.

Example 1

As shown in Fig. 1, the intelligent water injection device of the present invention includes a driving part, a sliding cavity, a piston part, a water injection part and a shift adjustment part.

The driving part includes a return spring 12, a control pipeline 1, an oil hole provided on the sealing cylinder 5, and a hydraulic chamber between the inner wall of the sealing cylinder 5 and the outer wall of the central pipe 3. The piston part is driven downward by pressurizing the hydraulic chamber; the piston part is driven upward by the return spring 12 .

The sliding cavity is composed of an upper joint 2, a sealing cylinder 5, a pressure cap 6, a connecting head 7, a sleeve 8, a driving sleeve 9 and a lower joint 11. The upper joint 2, the sealing cylinder 5, the pressure cap 6, the connection head 7, the sleeve 8, and the lower joint 11 are sequentially connected through threads, and the joints of the pressure cap 6, the connection head 7, and the sleeve 8 are sealed by the sealing assembly 4, and other connections It is sealed with an "O" ring. The sliding chamber provides a sliding space for the piston part.

The piston part is composed of a central tube 3 and a sealing assembly 4 . The hydraulic medium enters the hydraulic cavity formed by the inner wall of the sealing cylinder 5, the outer wall of the central pipe 3, the bosses provided on the outer wall of the central pipe 3, and the sealing assembly through the pipe hole arranged on the sealing cylinder 5, and pushes the piston part to move down. The sealing cylinder 5 is connected with the control pipeline 1 through a sealing thread.

The sealing assembly 4 adopts a combined sealing form of a retaining ring, a "V" seal and an "O" seal, which not only bears pressure in both directions, but also is wear-resistant, ensuring that the seal can still be sealed after repeated switching. The retaining ring in the sealing assembly 4 can be set as required or omitted. A good sealing structure provides a key guarantee for realizing a multi-layer water injection construction.

The underside of the boss of the central tube 3 is provided with a through hole, which prevents the inner wall of the sealing cylinder 5, the outer wall of the central tube 3, the boss of the central tube 3 and the pressure cap 6 from forming a closed cavity to hinder the movement of the piston; thus allowing the central tube 3 to protrude. The platform and the sealing cylinder 5 can better seal and cooperate; reduce the loss of hydraulic medium; improve the performance of the piston part.

The water injection part is composed of the upper joint 2, the central pipe 3 and the connecting head 7. The central pipe 3 is evenly distributed along the circumferential direction with 6 rows of water injection holes arranged in the axial direction, and each row of water injection holes is the fourth, third, second, and first water injection holes and pressure relief holes from top to bottom; The hole diameter is small, and it can also be used to balance the reservoir pressure and water injection pressure; there are 6 water passage holes connected internally and externally on the connector 7, and the precise control of the flow can be realized by adjusting the corresponding relationship between the water injection hole and the water passage hole through the control pipeline 1. During specific implementation, it is not limited to 5 water injection holes, and 2 or 3 or 4 water injection holes can be provided. In this embodiment, the apertures of the 5 water injection holes are the same, and may not be consistent during specific implementation; in this embodiment, the gears are 6 gears; during specific implementation, the number of water injection holes can be other numbers, which can be matched with the number of gears.

During specific implementation, the number of water passing holes and the number of rows of water injection holes can be different; for example, by setting an annular shallow groove on the outer wall of the central tube 3, the water injection holes at the same position in the axial direction are connected, or the inner wall of the connector 7 is provided Ring shallow groove and other forms.

The shift adjustment part is composed of sliding pin 10, driving sleeve 9 and central tube 3. As shown in Fig. 2, track grooves are sequentially arranged on the central tube 3; The lengths of the bit track grooves decrease successively, corresponding to the positions of the water injection holes. The sliding pin 10 is installed on the inner side of the driving sleeve 9, and the protruding end slides in the track groove.

The initial position of the intelligent water injection device is closed. At this time, there is no water injection channel between the central pipe 3 and the connector 7, and the sliding pin 10 is in the first limit track groove of the central pipe 3.

During the specific operation, the hydraulic medium in the control pipeline 1 is pressurized to drive the piston to move down, and at the same time, the sliding pin 10 moves upward along the first limit track groove. 7 When connecting, if necessary, wait for the pressure of the oil reservoir and the water injection pressure to balance before continuing to pressurize the hydraulic medium in the control pipeline 1 to drive the piston to move down. After the sliding pin 10 leaves the first limit track groove, it is guided by the slope of the shift track groove and enters the first shift track groove; Moving up, the sliding pin 10 moves down along the first shifting track groove, and after leaving the first shifting track groove, it enters the second limit track groove through the guidance of the slope of the shifting track groove; at this time, the pressure relief hole is connected with the The head 7 is connected, and the first opening is completed.

Continue to repeat the operation to realize shifting to the designated flow gear. The length of the limit track groove corresponding to each gear is different. Therefore, when the sliding pin 10 moves the lower end along the limit track groove, the number of water passing holes communicated with the water injection holes is different, resulting in different water injection flow rates. The driving sleeve 9 is clamped between the sleeve 8 and the lower joint 11 , the upper end of the return spring 12 is in contact with the central tube 3 , and the lower end of the return spring 12 is installed in the lower joint seat of the lower joint 11 .

Continue to repeat the above operations to complete the second opening. At this time, the pressure relief hole and the first water injection hole are connected to the connector 7. If you need to continue to increase and adjust the flow rate, repeat the above operations. The third opening is completed. Connecting head 7 communicates with the pressure relief hole, the first water injection hole and the second water injection hole. Adjust the water injection gear according to the actual production needs until the fifth opening, at this time it is the maximum flow gear, and the pressure relief hole, the first water injection hole, the second water injection hole, the third water injection hole and the connection head 7 are connected. The fourth water injection hole.

If the water injection channel needs to be closed after the work is completed, only need to continue to repeat the previous operation to realize shifting to the initial position.

The combination of the center pipe 3 shift track groove and the sliding pin 10 realizes the precise distribution and adjustment of the water injection volume, so that the layered water injection in the inclined well and the horizontal well can be more accurate.

Example 2

As shown in Figure 3, when the intelligent water injection device of the present invention is used in multiple layers, the control pipeline 1 of the second-stage intelligent water injection device is provided by the wellhead, and after being pre-buried in the first stage, it passes downwards and is connected to the sealing cylinder of the second stage 5; the control pipeline 1 of the third-level intelligent water injection device is provided by the wellhead, and after the first level is pre-embedded, it goes down to the second level, and after continuing to be pre-buried, it goes down to the sealing cylinder 5 connected to the third level; press This principle, and so on.

During operation, the control of the water injection flow rate of each layer is not affected by other layers, and accurate and independent control can be realized. The specific operation method is the same as that of the single layer in Embodiment 1.

The single-pipeline control mode makes the pipe string lighter and simpler, saving equipment costs; it is convenient for cascading to achieve the purpose of multi-stage control. Therefore, the device can realize multi-layer water injection at the same time, and is not only suitable for conventional wells, but also suitable for horizontal wells and inclined wells, which enriches the selection of water injection process tools for oilfield production.

The above examples are only used to illustrate the utility model, in addition, there are many different implementation modes, and these implementation modes are all that those skilled in the art can think of after comprehending the idea of the utility model, so, it is not mentioned here List them one by one.

Claims (9)

1. an Intelligent water injection device, it is characterized in that, comprise drive division, sliding cavity, piston portion, water filling portion and gearshift adjusting portion, described drive division drives described piston portion to move back and forth along described sliding cavity, described piston portion comprises central tube, described central tube is provided with the water injection hole that several are arranged vertically, and described water filling portion was provided with water through hole, described water injection hole and the described number crossed water through hole and be communicated with is changed, the injection flow of control device by described gearshift adjusting portion gear shift operation.

2. Intelligent water injection device as claimed in claim 1, it is characterized in that, described drive division comprises hydraulic-driven portion and back-moving spring; Described hydraulic-driven portion is sealing drum inwall and central tube outer wall, the boss of central tube outer wall setting and the hydraulic cavities of black box formation, and hydraulic medium enters in hydraulic cavities by the pore be arranged on sealing drum, promotes piston portion and moves down; Described back-moving spring promotes piston portion moves.

3. Intelligent water injection device as claimed in claim 1, it is characterized in that, described sliding cavity is made up of top connection, sealing drum, pressure cap, connector, sleeve, actuating sleeve and lower contact; Described top connection, sealing drum, pressure cap, connector, sleeve, lower contact are threaded connection successively, and wherein pressure cap, connector, sleeve connection place adopt black box sealing, and other junctions are sealed by "O"-ring.

4. Intelligent water injection device as claimed in claim 1, it is characterized in that, described piston portion is made up of central tube and black box.

5. the Intelligent water injection device as described in claim 3 or 4, is characterized in that, described black box adopts the combination sealing form of the sealing of back-up ring, " V " type and the sealing of " O " type.

6. Intelligent water injection device as claimed in claim 1, it is characterized in that, described water filling part is made up of top connection, central tube and connector (7).

7. Intelligent water injection device as claimed in claim 1, is characterized in that, the circumferentially uniform water injection hole being provided with some rows and arranging vertically on described central tube.

8. Intelligent water injection device as claimed in claim 1, it is characterized in that, described gearshift adjusting portion is made up of sliding pin, actuating sleeve and central tube; Described central tube is provided with the rail groove for shifting gears; Described sliding pin is arranged on inside described actuating sleeve, and the external part of described sliding pin slides in described rail groove.

9. Intelligent water injection device as claimed in claim 8, is characterized in that, the rail groove on described central tube is made up of several limit track grooves and corresponding transposition rail groove; The quantity of described limit track groove is identical with the row of water injection hole on described central tube.