CN104775798A - Whole-well quantitative water injection device - Google Patents

Abstract

A whole well quantitative water injection device. The main purpose is to solve the problem of unstable water injection volume often caused by pressure fluctuations in the process of oilfield water injection. It is characterized in that: the valve body is hollow inside to accommodate the valve sleeve; the valve sleeve is a hollow cylinder structure, and the upper and lower parts of the hollow cylinder are respectively opened with a liquid inlet guide ring groove and a liquid outlet guide ring groove, and the liquid inlet guide There is a large hole on the launder, so that the liquid inlet diversion groove is connected with the inner hole of the valve sleeve, and several small holes are opened along the circumference of the liquid outlet groove, so that the inner hole of the valve sleeve is connected with the liquid outlet groove; the inner hole of the valve sleeve is a sliding The slide chamber of the valve; the slide valve is a hollow multi-section cylindrical structure, and the upper end of the outer surface is a small-diameter pressure-guiding surface, which forms a gap with the inner hole of the valve sleeve to provide a pressure-guiding gap. A plurality of diversion holes are opened to make the diversion groove communicate with the inner hole of the slide valve; the top of the slide valve is connected to the flow regulating valve core. The device can automatically adjust the opening of the slide valve according to the change of the injection pressure to realize the quantitative water injection control of the whole well.

Description

Quantitative water injection device for the whole well

technical field

The invention relates to a quantitative water injection device used in oil field water injection wells.

Background technique

The practice of water injection development in oilfields shows that quantitative water injection in oilfields is the basis and key to ensure sustained high and stable production in oilfields. Reasonable selection of water injection pipe form and water distribution tools is the basic condition for all kinds of water injection wells to achieve quantitative water injection.

At present, each oilfield basically uses a water distribution pump to control the injection of multiple oil wells. During the water injection process, according to the actual situation of each well, it is often necessary to perform operations such as well washing, flushing pipelines, and tube wells. Stable, resulting in frequent fluctuations in water injection pump pressure, and fluctuations in formation permeability, which will affect the change in the injection rate of the water injection well, operators need to adjust the water injection rate according to the change in water injection pump pressure and the injection rate of the water well. It often leads to untimely discovery, over-injection and under-injection phenomena, and it is difficult to ensure quantitative water distribution of water wells, which has a negative impact on the rational development of oilfields. Therefore, it is very necessary to develop a water injection quantitative control device to ensure that the water injection volume is basically constant when the pump pressure and the water well pressure change.

With the deepening of oilfield development, the water injection technology is continuously improved, and the water injection tools are also becoming more and more perfect. However, in general, the research on the control of the injection water volume is not deep enough. Some scientific research work has only studied the form of faucets, and developed double-choke faucets, spiral-choke faucets, etc. Although these faucets can form a large pressure drop, they can be properly adjusted to the water injection volume of wells with good water absorption. Restrictions, but did not fundamentally solve the problem of quantitative allocation.

Contents of the invention

In order to solve the technical problems mentioned in the background technology, the present invention provides a quantitative water injection device for the whole well. This quantitative water injection device has a simple structure and ingenious design, and can realize quantitative water injection of water wells under pressure changing conditions.

The technical solution of the present invention is: the whole well quantitative water injection device mainly includes a valve body, a valve sleeve, a slide valve and a flow adjustment valve core, and its unique features are:

The valve body is a hollow cuboid structure with a liquid inlet pipe on the upper left side and a liquid outlet pipe on the lower right side; the valve body is hollow inside and accommodates the valve sleeve inside; the upper part of the valve body is provided with internal threads, It is used to connect the gland. The gland realizes the fluid seal with the valve body by pressing the first O-ring. The lower part of the valve body is evenly distributed with four threaded holes along the circumference to connect the through cover; the inner part of the valve body There is a shoulder between the hole and the upper threaded hole, and a pressure guide groove is opened on the shoulder, so that the liquid pressure of the liquid inlet pipe can act on the top of the slide valve;

The valve sleeve is a hollow cylindrical structure, which is installed in the valve body and cooperates with the inner hole of the valve body through the outer cylindrical surface. A liquid inlet guide ring groove and a liquid inlet hole are opened on the upper part of the valve sleeve. The upper liquid inlet hole and the liquid inlet guide ring groove are connected with the liquid inlet pipe of the valve body. The lower part of the valve sleeve is opened with a liquid outlet guide ring groove. There are several liquid outlet holes at the bottom of the chute. The groove communicates with the liquid outlet hole and the liquid outlet pipe at the lower right side of the valve body; the inner hole of the valve sleeve is the slide chamber of the slide valve;

The slide valve is a multi-section hollow cylinder structure with unequal diameters, which is installed inside the valve sleeve. The two are matched by the inner and outer cylindrical surfaces, and the slide valve can move up and down in the valve sleeve. The outer upper end of the slide valve is a guide with a small diameter. The pressure surface forms a gap with the inner hole of the valve sleeve to provide a pressure guide gap. There are guide grooves on the small diameter pressure guide surface, and several guide holes are opened in the groove along the radial direction. The guide grooves It communicates with the inner hole of the spool valve; the lower end of the spool valve is a large-diameter matching surface, which is matched with the inner hole of the valve sleeve, and there are several balance grooves on the matching surface; the inside of the spool valve is a stepped hole structure for water injection. There is an internal thread on the top of the slide valve, which is connected to the flow regulating valve core, and the lower part of the slide valve is a stepped hole for placing and accommodating the spring;

The diameter of the outer cylindrical surface of the upper end of the slide valve is smaller than that of the outer cylindrical surface of the lower end, and a pressure guide channel is formed between the outer cylindrical surface of the slide valve and the inner cylindrical surface of the valve body, so as to realize that the liquid pressure of the liquid inlet pipe acts on the slide valve through the pressure guide channel. On the valve; on the upper part of the slide valve, there are four slide valve liquid inlets, and the slide valve liquid inlets are connected with the liquid inlet holes on the valve sleeve, so as to realize that the inlet liquid flows into the slide valve through the liquid inlets. The center channel of the valve; there are a number of slide grooves on the outer cylindrical surface matching the lower part of the slide valve and the valve sleeve to ensure the centering of the slide valve;

The flow regulating valve core is connected to the slide valve through threads, its upper end is a square opening handle, and its lower part is a cylindrical regulating valve head, which passes between the regulating valve head and the internal diversion hole of the sliding valve. The change of the relative position realizes the flow adjustment; the upper end of the spool valve and the flow adjustment spool are connected through threads, and the square opening handle at the top of the flow adjustment spool is turned, and the top end of the flow adjustment spool is connected to the liquid inlet of the spool valve. The relative position between them changes, so as to realize the adjustment of the opening of the slide valve liquid inlet and realize the flow adjustment; a spring is placed in the inner hole of the lower part of the slide valve to limit the position of the slide valve; the spring is placed in the spring pad, and the spring The pad fits with the end face of the transparent cover;

The transparent cover and the valve body are connected by hexagonal head bolts. The transparent cover is provided with a second O-shaped rubber sealing ring, and the transparent cover cooperates with the surface of the inner hole of the lower part of the valve body through the second O-shaped rubber sealing ring to realize the valve body and the valve body. The seal between the transparent covers; the spring adjustment rod is connected with the transparent cover through threads, and connected with the spring pad through the end face to realize the adjustment of the spring preload; the upper part of the valve body is connected with the gland through threads, and the valve body is provided with a second An O-shaped rubber sealing ring to realize the sealing of the valve body and the gland;

The injection water circulation path of this kind of water injection device is, through the liquid inlet pipe at the upper left part of the valve body, the liquid inlet guide ring groove and the liquid inlet hole at the upper part of the valve sleeve, the liquid inlet hole of the slide valve, the inner cavity of the slide valve, and the liquid outlet of the valve sleeve. The hole and the outlet guide ring groove at the lower part of the valve sleeve finally flow out from the outlet pipe at the lower right part of the valve body.

The invention has the following beneficial effects: the quantitative water injection device mainly includes a valve body, a valve sleeve, a slide valve and a flow regulating valve core. The valve body as a whole has a rectangular parallelepiped structure. There are valve inlets and valve outlets on the left and right sides of the valve body respectively. The inside of the valve body is hollow and contains a valve sleeve. The upper part of the valve body is provided with internal threads for installing the sealing cover plate, and the lower part has four threaded holes for installing the slide valve. The valve sleeve is a hollow cylinder structure, and the upper and lower parts of the hollow cylinder are respectively provided with a liquid inlet diversion ring groove and a liquid outlet diversion ring groove, wherein a large hole is opened on the liquid inlet diversion groove , so that the liquid inlet diversion groove is connected with the inner hole of the valve sleeve, and several small holes are opened in the liquid outlet groove along the circumferential direction, so that the inner hole of the valve sleeve is connected with the liquid outlet groove. The inner hole of the valve sleeve is the slide cavity of the slide valve. The slide valve is a hollow multi-segment cylindrical structure, the upper end of the outer surface is a small-diameter pressure guide surface, which forms a gap with the inner hole of the valve sleeve to provide a pressure guide gap, and a guide groove is opened on the pressure guide surface. A plurality of diversion holes communicate the diversion groove with the inner hole of the slide valve. The lower end of the spool valve is a large-diameter matching surface, which is matched with the inner hole of the valve sleeve, and several balance grooves are opened on the matching surface. The interior of the slide valve is a stepped hole structure, which is a water injection channel. There is an internal thread on the top of the spool valve, which is connected to the flow regulating valve core, and the lower part is a stepped hole for placing and accommodating the spring. The flow regulating spool is connected to the slide valve through threads, the upper end is a square opening handle, and the lower part is a cylindrical regulating valve head. The flow adjustment is realized by changing the relative position between the valve head and the guide hole of the slide valve. Install the device at the wellhead of the water injection well. When the pressure water flows through the cavity of the slide valve, it acts on the two ends of the slide valve. In addition to the action of the spring, the slide valve moves back and forth with the change of pressure, thus changing the relationship between the slide valve and the valve. Set the flow area between the liquid outlets to maintain a certain flow rate. At the same time, the pre-tightening force of the spring can also be adjusted through the spring adjustment lever, and the opening of the slide valve inlet hole can be adjusted through the flow adjustment spool to control the overall pressure and flow adjustment range of the whole well water injection. The whole well quantitative water injection device has simple structure, ingenious design, simple process, no need to modify the existing water injection process, flexible adjustment of water volume, and automatic control at the same time, which greatly reduces the labor intensity of workers and has great practical application value .

Description of drawings:

Fig. 1 is the longitudinal sectional structure diagram of the quantitative water injection device of the whole well;

Fig. 2 is a three-dimensional view of the appearance of the present invention;

Fig. 3 is a three-dimensional partial sectional view 1 of the present invention;

Fig. 4 is a three-dimensional partial sectional view 2 of the present invention;

Fig. 5 is a schematic view of the structure of the valve body of the present invention;

Fig. 6 is a schematic structural view of a valve sleeve of the present invention;

Fig. 7 is a structural schematic diagram of the slide valve of the present invention;

Figure 8 is a schematic diagram of the structure of the flow adjustment valve core of the present invention.

In the figure 1-through cover; 2-spring adjustment lever; 3-hex head bolt; 4-second O-shaped rubber sealing ring; 5-valve body; 6-third O-shaped rubber sealing ring; 7-spring pad; 8 -circlip; 9-valve sleeve; 10-slide valve; 11-flow adjustment spool; 12-first O-shaped rubber sealing ring; 13-gland; 14-spring; 15-straight pin; 16-inlet pipe ;17-inlet diversion groove; 18-valve sleeve outlet hole; 19-gland removal hole; 20-ring groove; 21-pressure guide channel; 22-slide valve inlet hole; 23-chute; Liquid outlet pipe; 25-valve sleeve liquid inlet; 26-liquid outlet guide ring groove; 27-square opening knob; 28-pressure guiding groove.

Detailed ways:

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Fig. 5 in conjunction with Fig. 1 and Fig. 2, the valve body 5 is a hollow cuboid structure, an inlet pipe 16 is arranged on the upper left side, and a liquid outlet pipe 24 is arranged on the lower right side, and the upper part of the valve body 5 is opened. There is an internal thread for connecting the gland 13. The gland 13 realizes fluid sealing with the valve body 5 by pressing the O-ring 12. There is a shoulder between the inner hole of the valve body 5 and the top threaded hole. The shoulder There is a pressure guide groove 28 on it, so that the liquid pressure of the liquid inlet pipe can act on the top of the slide valve, and four threaded holes are evenly distributed along the circumference of the lower part of the valve body 5 for connecting the transparent cover 1 .

As shown in FIG. 6 in combination with FIG. 1 and FIG. 3 , the valve sleeve 9 is a hollow cylindrical structure, which is installed in the valve body 5 and fits with the inner hole of the valve body 5 through the outer cylindrical surface. The upper part of the valve sleeve 9 is provided with a liquid inlet guide ring groove 17 and a liquid inlet hole 25, and the liquid inlet hole 25 and the liquid inlet guide ring groove 17 on the valve sleeve 9 are connected with the valve body 5 inlet pipes, and the valve sleeve 9 The lower part is provided with a liquid outlet guide ring groove 26, a plurality of liquid outlet holes 18 at the bottom of the chute 26, a liquid outlet guide ring groove 26 and a plurality of liquid outlet holes at the bottom of the valve sleeve 9 and the lower part of the right side of the valve body 5. The tube is connected.

As shown in Fig. 7 in conjunction with Fig. 1 and Fig. 3, the slide valve 10 is a multi-section hollow cylinder structure with unequal diameters, which is installed inside the valve sleeve 9, and the two are matched by the inner and outer cylindrical surfaces, and the slide valve 10 can be mounted on the valve sleeve 9. Move up and down inside. The diameter of the outer cylindrical surface of the upper end of the slide valve 10 is smaller than the outer cylindrical surface of the lower end. Therefore, at this position, a pressure guiding channel 21 is formed between the outer cylindrical surface of the slide valve 10 and the inner cylindrical surface of the valve body 9, and the liquid in the liquid inlet pipe 16 Pressure can act on the slide valve via the pressure guiding channel 21 . On the upper part of the slide valve 10, there are four slide valve liquid inlets 25, which communicate with the liquid inlet holes on the valve sleeve 9, and the incoming liquid flows into the central passage of the slide valve through the liquid inlets. A plurality of slide grooves 20 are arranged on the outer cylindrical surface of the lower part of the slide valve 10 and the valve sleeve 9 to ensure the centering of the slide valve 10 while allowing a small amount of sand to be deposited.

As shown in Figures 1 and 4, the upper end of the spool valve 10 is threadedly connected to the flow adjustment spool 11, and the square opening knob 27 on the top of the flow adjustment spool is turned, and the gap between the top of the flow adjustment spool and the liquid inlet 25 of the spool is The relative position of the slide valve changes, and the opening of the liquid inlet of the slide valve can be adjusted to realize flow regulation. A spring 14 is placed in the lower inner hole of the spool valve 10 to limit the position of the spool valve 10 . The spring 14 is placed in the spring pad 7, and the spring pad 7 cooperates with the end surface of the transparent cover 1.

The transparent cover 1 and the valve body 5 are connected by hexagonal head bolts 3, and the transparent cover 1 is provided with an O-shaped rubber sealing ring 4, and the transparent cover 1 cooperates with the surface of the inner hole of the lower part of the valve body 5 through the sealing ring 4 to realize the sealing of the valve body 5. and the sealing of the transparent cover 1. The spring adjustment rod 2 is connected with the transparent cover 1 through threads, and connected with the spring pad 8 through the end face cooperation, so as to adjust the pre-tightening force of the spring. The upper part of the valve body 5 is threadedly connected with the gland 13, and the valve body 5 is provided with an O-shaped rubber sealing ring 12 to realize the sealing of the valve body 5 and the gland 13.

The injected water passes through the liquid inlet pipe at the upper left part of the valve body 5, the liquid inlet guide ring groove 17 and the liquid inlet hole 25 at the upper part of the valve sleeve 9, the liquid inlet hole 22 of the slide valve 10, the inner cavity of the slide valve 10, and the outlet of the valve sleeve 9. The liquid hole 18 and the liquid outlet guide ring groove 26 at the lower part of the valve sleeve 9 finally flow out from the liquid outlet pipe 24 at the lower right part of the valve body 5 .

Briefly describe the working principle of the present invention below:

Let the pressure in the liquid inlet pipe 16 at the upper left part of the valve body 5 be P1, the pressure in the cavity of the slide valve 10 be P2, and the pressure in the liquid outlet pipe 24 at the lower right part of the valve body 5 be P3. During the water injection process, the slide valve 10 is in a balanced state under the joint action of the pressure difference (P1-P2) and the spring 14 .

When P1 becomes larger, the pressure difference (P1-P2) increases, and under the action of the pressure difference, the slide valve 10 moves down, and the flow area between the slide valve 10 and the valve sleeve 9 decreases. At this time, the pressure in the spool valve cavity increases accordingly, so that the pressure difference (P1-P2) decreases, and finally returns to the given pressure difference value corresponding to the stiffness of the spring 14 .

When P1 becomes smaller, the pressure difference (P1-P2) decreases, the spring 14 pushes the slide valve 10 to move upward, and the flow area between the slide valve 10 and the valve sleeve 9 increases. At this time, the pressure in the spool valve cavity decreases accordingly, which increases the pressure difference (P1-P2), and finally returns to the given pressure difference value corresponding to the stiffness of the spring 14 . Therefore, the flow rate flowing through the quantitative water injection device is basically kept constant.

When P3 increases, the pressure difference (P2-P3) decreases, the spring 14 pushes the slide valve 10 to move upward, and the flow area between the slide valve 10 and the valve sleeve 9 increases. At this time, the pressure in the spool valve cavity increases accordingly, so that the pressure difference (P2-P3) decreases, and finally returns to the given pressure difference value corresponding to the stiffness of the spring 14 .

When P3 decreases, the pressure difference (P2-P3) increases, the pressure difference pushes the slide valve 10 to move down, and the flow area between the slide valve 10 and the valve sleeve 9 decreases. At this time, the pressure in the spool valve cavity decreases accordingly, which increases the pressure difference (P2-P3), and finally returns to the given pressure difference value corresponding to the stiffness of the spring 14 . Therefore, the flow rate flowing through the quantitative water injection device is basically kept constant.

Claims (1)

1. A quantitative water injection device for the whole well, mainly including a valve body (5), a valve sleeve (9), a slide valve (10) and a flow adjustment valve core (11), characterized in that: The valve body is a hollow cuboid structure with a liquid inlet pipe (16) on the upper left side and a liquid outlet pipe (24) on the lower right side; the valve body is hollow inside and contains the valve sleeve; the valve body (5) There is an internal thread on the upper part to connect the gland (13). The gland (13) realizes the fluid seal between the valve body (5) and the valve body (5) by pressing the first O-ring (12). (5) Four threaded holes are evenly distributed along the circumference of the lower part to connect the transparent cover (1); there is a shoulder between the inner hole of the valve body and the upper threaded hole, and a pressure guiding groove (28) is opened on the shoulder. so that the liquid pressure of the liquid inlet pipe can act on the top of the slide valve; The valve sleeve is a hollow cylindrical structure, which is installed in the valve body (5), cooperates with the inner hole of the valve body (5) through the outer cylindrical surface, and has a liquid inlet guide ring groove on the upper part of the valve sleeve (17) and the liquid inlet hole (25), the liquid inlet hole (25) and the liquid inlet guide ring groove (17) on the valve sleeve (9) are connected with the liquid inlet pipe of the valve body (5), and the valve sleeve (9) ) is provided with a liquid outlet guide ring groove (26), the bottom of the chute (26) has several liquid outlet holes (18), the liquid outlet guide ring groove (26) and the liquid outlet holes (18) and The outlet pipe at the lower right side of the valve body (5) is connected; the inner hole of the valve sleeve is the slide chamber of the slide valve; The slide valve is a multi-section hollow cylinder structure with unequal diameters, which is installed inside the valve sleeve (9). The two are matched by the inner and outer cylindrical surfaces, and the slide valve (10) can move up and down inside the valve sleeve (9). The upper end of the outer surface of the slide valve is a small-diameter pressure-guiding surface, which forms a gap with the inner hole of the valve sleeve to provide a pressure-guiding gap. diversion hole, the diversion groove communicates with the inner hole of the spool valve; the lower end of the spool valve is a large-diameter mating surface, which is matched with the inner hole of the valve sleeve, and a number of balance grooves are opened on the mating surface; the slidable valve The inside of the valve is a stepped hole structure, which is a water injection channel. The top of the slide valve is provided with an internal thread, which is connected to the flow regulating valve core. The lower part of the slide valve is a stepped hole for placing and accommodating the spring (14); The diameter of the outer cylindrical surface at the upper end of the slide valve is smaller than that of the outer cylindrical surface at the lower end, and a pressure guide channel (21) is formed between the outer cylindrical surface of the slide valve (10) and the inner cylindrical surface of the valve body (9), so as to realize the connection of the liquid inlet pipe (16 ) of the liquid pressure acts on the slide valve through the pressure guide channel (21); on the upper part of the slide valve (10), there are four slide valve inlets (25), and the slide valve inlet and the valve The liquid inlet hole on the sleeve (9) is connected so that the incoming liquid flows into the central channel of the slide valve through the liquid inlet; there are several openings on the outer cylindrical surface of the lower part of the slide valve (10) that cooperates with the valve sleeve (9). The chute (20) to ensure the centering of the slide valve (10); The flow regulating valve core is connected to the slide valve through threads, its upper end is a square opening handle (27), and its lower part is a cylindrical regulating valve head. The change of the relative position between the orifices realizes the flow adjustment; the upper end of the slide valve (10) is connected with the flow adjustment spool (11) through a threaded connection, and the square opening handle (27) on the top of the flow adjustment spool is turned, so that The relative position between the top of the flow adjustment spool and the liquid inlet port (25) of the slide valve changes, so that the opening of the liquid inlet port of the slide valve can be adjusted to realize flow adjustment; the inner hole at the lower part of the slide valve (10) Place the spring (14) to limit the slide valve (10); the spring (14) is placed in the spring pad (7), and the spring pad (7) is matched with the end surface of the transparent cover (1); The through cover (1) and the valve body (5) are connected by hex head bolts (3). The second O-shaped rubber sealing ring (4) is provided on the through cover (1), and the through cover (1) passes through the second O The shaped rubber sealing ring (4) cooperates with the surface of the inner hole of the lower part of the valve body (5) to realize the sealing between the valve body (5) and the through cover (1); the spring adjustment rod (2) and the through cover (1) pass through The threaded connection is connected with the spring pad (8) through the end face fit to realize the pre-tightening force of the adjustable spring (14); the upper part of the valve body (5) is connected with the gland (13) through threads, and the valve body (5) is equipped The first O-shaped rubber sealing ring (12) to realize the sealing of the valve body (5) and the gland (13); The injection water flow path of this kind of water injection device is through the liquid inlet pipe at the upper left of the valve body (5), the liquid inlet guide ring groove (17) and the liquid inlet hole (25) at the upper part of the valve sleeve (9), and the liquid inlet through the slide valve. hole (22), the inner cavity of the slide valve (10), the outlet hole (18) of the valve sleeve (18) and the liquid outlet guide ring groove (26) at the lower part of the valve sleeve (9), and finally by the valve body (5) at the lower right Liquid outlet pipe (24) flows out.