A device for use in well testing and a method of using the device

Abstract

The application discloses a kind of exploration well pumping test layering water stop device and its using method, including connecting pipe one, the bottom of connecting pipe one is provided with edge ring, the lower end of connecting pipe one is connected with connecting rod in ring direction evenly and the bottom of connecting rod is connected with supporting plate, edge ring and the outer edge of supporting plate are provided with ring groove in ring direction evenly and soft baffle ring is arranged in ring groove, and water-absorbing resin filling layer is arranged in connecting pipe one.Soft ring cover expands horizontally, ring taper is pressed into the inner wall of drill hole, not only increase the sealing performance of the water stop device to drill hole cooperation, but also can guarantee the stability of the water stop device in drill hole, water-absorbing resin particles are effectively filled between soft baffle ring, under the action of water seeping between soft baffle ring and the inner wall of drill hole, water-absorbing resin particles begin to swell rapidly, until effectively filled to the space composed of soft baffle ring, edge skirt and the inner wall of drill hole, due to its unique water absorption effect, when water flows out from the inner wall of drill hole, the overall water stop capacity is enhanced, so the water stop stability is better.

Description

Technical Field

[0001] This invention belongs to the field of geological exploration equipment technology, specifically relating to a layered water-stopping device for pumping tests in exploration wells and its usage method. Background Technology

[0002] During geological exploration, it is often necessary to drill boreholes in the exploration area using drilling equipment. In order to obtain the water content of soil layers at different depths, water-stopping operations need to be carried out on the boreholes before pumping.

[0003] Application CN111173474A discloses a water-stopping device and a water-pumping test apparatus and method for a stratified pumping test. The invention relates to a rubber airbag 6, which is fitted onto the outer wall of the main body; a pressure pipe 15, located within the main body, with one end extending from the top of the main body as a pressure interface 4 and the other end as an air outlet 7, which communicates with the rubber airbag 6; and a water outlet pipe 14, vertically arranged, with its lower end serving as a water inlet 10 and passing through the main body. The upper end is the water outlet 2; when the rubber airbag 6 receives high-pressure gas, it will not produce vertical contraction deformation, thus greatly protecting the stability of the well wall. Especially when conducting pumping tests in sand and gravel layers, ordinary water-stopping devices 24 will produce more than half of the vertical contraction distance when they expand. However, although the rubber airbag 6 can be inflated instantaneously and quantitatively, due to the presence of sand and gravel particles on the borehole wall itself, the outer wall of the rubber airbag is cushioned by the sand and gravel particles, making it easy for gaps to exist between the rubber airbag and the borehole wall. Therefore, the water-stopping effect is not very stable, and it is necessary to set up a water-stopping device with a more stable water-stopping effect. Summary of the Invention

[0004] The purpose of this invention is to provide a layered water-stopping device for pumping tests in exploration wells, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a layered water-stopping device for pumping tests in exploration wells, comprising a first connecting pipe, a side ring provided at the bottom of the first connecting pipe, a connecting rod uniformly connected circumferentially at the lower end of the first connecting pipe and a support plate connected at the bottom of the connecting rod, a ring groove uniformly provided circumferentially on the outer edge of the side ring and the support plate and a soft retaining ring provided in the ring groove, a baffle plate provided at the inner bottom of the first connecting pipe, a water-absorbing resin filling layer provided inside the first connecting pipe, a first pressure plate provided inside the first connecting pipe and above the water-absorbing resin filling layer, a first sealing ring provided on the outer edge of the first pressure plate and the first sealing ring pressed against the inner wall of the first connecting pipe;

[0006] The first connecting pipe has uniformly spaced through holes in a circumferential direction. An outer ring is provided above and below each through hole in the first connecting pipe. A soft ring cover is provided inside the outer ring and communicates with the inside of the connecting pipe through the through holes. A through pipe is screwed to the top of the connecting pipe. Air holes are uniformly spaced in a circumferential direction at the bottom of the through pipe and communicate with the connecting pipe through the air holes. A movable rod is connected to the top of the first pressure plate. The movable rod passes through the bottom of the through pipe into the through pipe. A second pressure plate is connected to one end of the movable rod that passes through the through pipe. The second pressure plate is located inside the through pipe. An external air pressurization pipe is connected to the top of the through pipe.

[0007] Preferably, both the side ring and the support plate are provided with support plates evenly arranged in the circumferential direction, and the support plates are fixed and supported on the soft retaining ring.

[0008] Preferably, the outer edge of the soft retaining ring is provided with a side skirt.

[0009] Preferably, the outer wall of the soft ring cover is provided with a ring cone.

[0010] Preferably, a second sealing ring is provided on the outer edge of the second pressure plate, the second sealing ring is pressed against the inner wall of the through pipe, and a spring is sleeved on the movable rod, the spring being located inside the through pipe and at the lower part of the second pressure plate.

[0011] Preferably, a top cover is screwed to the top of the pipe, and a second connecting pipe is provided on the top cover. An air inlet hose is connected to the second connecting pipe and the air inlet hose is connected to an external compressed air station.

[0012] A method for using a stratified water-stopping device in an exploration well pumping test includes the following steps:

[0013] Step 1: Lower the drill bit to the borehole;

[0014] Step 2: Inflation and expansion for waterproofing and water absorption and expansion for filling and waterproofing;

[0015] Step 3: Prepare for use.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In this invention, compressed air rapidly presses down on the second pressure plate, which then forces the air from its lower part into the soft ring cover through the through hole. This causes the soft ring cover to expand laterally, and the ring cone is pressed into the inner wall of the borehole. This not only increases the sealing performance of the water-stopping device in relation to the borehole but also ensures the stability of the water-stopping device within the borehole. Simultaneously, the spring is compressed, the movable rod moves downward, and the first pressure plate moves downward, causing the water-absorbing resin filling layer to instantly press the baffle out of the connecting pipe. This allows the water-absorbing resin particles to effectively fill the space between the soft baffle rings. Under the action of water seeping from the inner wall of the borehole into the space between the soft baffle rings, the water-absorbing resin particles begin to rapidly absorb water and expand until they effectively fill the space composed of the soft baffle rings, the side skirt, and the inner wall of the borehole. Because the water-absorbing resin becomes softer than rubber after absorbing water, it effectively wraps the particles of various sizes on the inner wall of the borehole and effectively fills each water-permeable gap. This results in better water-sealing performance of the lower layer of the water-stopping device. In addition, due to its unique water absorption effect, it enhances the overall water-stopping ability when water comes out from the inner wall of the borehole, thus providing better water-stopping stability.

[0018] The usage method involved in this invention is simple and reliable to operate. Attached Figure Description

[0019] Figure 1 This is a front view schematic diagram of the present invention;

[0020] Figure 2 for Figure 1 A partial cross-sectional diagram;

[0021] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the soft retaining ring connection;

[0022] Figure 4 for Figure 2 A magnified schematic diagram of the pipe connection structure.

[0023] In the diagram: 1 Connector 1, 2 Side Ring, 3 Connecting Rod, 4 Support Plate, 5 Ring Groove, 6 Soft Retaining Ring, 7 Support Plate, 8 Side Skirt, 9 Baffle Plate, 10 Water Absorbent Resin Filler Layer, 11 First Pressure Plate, 12 First Sealing Ring, 13 Through Hole, 14 Outer Ring, 15 Soft Ring Cover, 16 Ring Cone, 18 Air Hole, 19 Movable Rod, 20 Spring, 21 Second Pressure Plate, 22 Second Sealing Ring, 23 Through Pipe, 24 Top Cover, 25 Connector 2, 26 Air Connecting Hose. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] See Figure 1 , Figure 2 and Figure 3A layered water-stopping device for pumping tests in exploration wells includes a connecting pipe 1. A side ring 2 is integrally formed at the bottom of the connecting pipe 1. A connecting rod 3 is uniformly welded circumferentially to the lower end of the connecting pipe 1, and a support plate 4 is welded to the bottom of the connecting rod 3. Circumferential grooves 5 are uniformly formed circumferentially on the outer edges of the side ring 2 and the support plate 4. The grooves 5 are annular grooves. A soft retaining ring 6, made of neoprene rubber, is bonded to the grooves 5 using AB resin adhesive. Support plates 7, made of 1 mm thick tungsten vanadium alloy, are uniformly fused circumferentially onto both the side ring 2 and the support plate 4. The support plates 7 are bonded to the soft retaining ring 6, and due to the elastic support of the support plates 6, the soft retaining ring 6 is reinforced. The retaining ring 6 provides support. The outer edge of the soft retaining ring 6 is integrally provided with a side skirt 8. The inner bottom of the connecting pipe 1 is tightly inserted with a baffle 9. The connecting pipe 1 is filled with a water-absorbing resin filling layer 10, which is made of unabsorbed water-absorbing resin particles. A first pressure plate 11 is placed inside the connecting pipe 1 and above the water-absorbing resin filling layer 10. The bottom outer edge of the first pressure plate 11 is bonded with a first sealing ring 12 using resin glue, and the first sealing ring 12 is pressed tightly against the inner wall of the connecting pipe 1. Through the setting of the first sealing ring 12, the first pressure plate 11 maintains good sealing performance when it moves up and down inside the connecting pipe 1.

[0026] See Figure 1 , Figure 2 , Figure 3 and Figure 4The connector 1 has uniformly spaced through holes 13. An outer ring 14 is integrally formed above and below each through hole 13 on the connector 1. A soft ring cover 15, made of neoprene rubber, is bonded to the inner wall of the outer ring 14 with resin adhesive. The soft ring cover 15 communicates with the inside of the connector 1 through the through holes 13. An annular cone 16 is integrally formed on the outer wall of the soft ring cover 15. When air is introduced into the soft ring cover 15 through the through holes 13, it is blocked by the outer ring 14, causing the soft ring cover 15 to expand laterally and press against the inner wall of the borehole. This prevents vertical expansion from knocking off particles from the inner wall of the borehole. A through pipe 23 is screwed to the top of the connector 1. A sealing ring groove is provided at the bottom of the through pipe 23. An internal sealing ring is inserted. When the connecting pipe 1 is locked to the through pipe 23, it ensures a good fit and seal after the connection between the connecting pipe 1 and the through pipe 23. The bottom of the through pipe 23 is provided with vent holes 18 evenly distributed around its perimeter, and the through pipe 23 is connected to the connecting pipe 1 through the vent holes 18. A movable rod 19 is screwed to the top center of the first pressure plate 11. The outer edge of the second pressure plate 21 is glued with a second sealing ring 22. The second sealing ring 22 is pressed against the inner wall of the through pipe 23. Through the cooperation between the second sealing ring 22 and the inner wall of the through pipe 23, the second pressure plate 21 can effectively push the air in the lowering space of the second pressure plate 21 downward when it moves up and down on the inner wall of the through pipe 23. A spring 20 is sleeved on the movable rod 19. Spring 20 is a compression-rebound type, with an initial compression-rebound force of 20 Newtons. Spring 20 is located inside the through-tube 23 and below the second pressure plate 21. Movable rod 19 slides through the bottom of the through-tube 23 into the through-tube 23. Movable rod 19 extends to one end of the through-tube 23 and is integrally set with the second pressure plate 21. When compressed air is introduced into the upper part of the through-tube 23, it will quickly press down the second pressure plate 21. The second pressure plate 21 forces the air in its lower part into the soft ring cover 15 through the through hole 13, causing the soft ring cover 15 to expand laterally. The ring cone 16 is pressed into the inner wall of the borehole, which not only increases the sealing performance of the water-stopping device in the borehole but also ensures the stability of the water-stopping device in the borehole. At the same time... When the spring 20 is compressed, the movable rod 19 moves down, causing the first pressure plate 11 to move down, which causes the water-absorbing resin filling layer 10 to instantly press the baffle 9 out of the pipe 1, so that the water-absorbing resin particles are effectively filled between the soft baffle rings 6. Under the action of water seeping from the inner wall of the borehole to the soft baffle rings 6, the water-absorbing resin particles begin to absorb water and expand rapidly until they effectively fill the space composed of the soft baffle rings 6, the side skirts 8 and the inner wall of the borehole. Since the water-absorbing resin is softer than rubber after absorbing water, it effectively wraps the particles of various sizes on the inner wall of the borehole and effectively fills each water-permeable gap. The water-sealing performance of the lower layer of this water-stopping device is better. In addition, due to its unique water absorption effect, it enhances the overall water-stopping ability when water comes out from the inner wall of the borehole.

[0027] See Figure 1 and Figure 2The top of the pipe 23 is threadedly locked with a top cover 24. The top of the top cover 24 has an annular groove, into which an oil-impregnated asbestos packing ring is inserted. When the top cover 24 is locked on the top of the pipe 23, it can ensure the sealing between the top cover 24 and the pipe 23. The top cover 24 is integrally provided with a second connecting pipe 25. The second connecting pipe 25 is interference-fitted with an air inlet hose 26, which connects to the exhaust port of an external compressed air station.

[0028] A method for using a stratified water-stopping device in an exploration well pumping test includes the following steps:

[0029] Step 1: Lower the drill bit to the borehole;

[0030] Step 2: Inflation and expansion for waterproofing and water absorption and expansion for filling and waterproofing;

[0031] Step 3: Prepare for use.

[0032] More specifically:

[0033] Lowering into the borehole: When in use, lower the water-stopping device into the borehole through the air hose 26 until it reaches the depth required for water stoppage, then stop lowering.

[0034] Inflatable expansion sealing and water absorption expansion filling sealing: The compressed air station is activated, quickly discharging compressed air through the air inlet hose 26 into the through pipe 23. The compressed air rapidly presses down on the second pressure plate 21, which forces the air at its lower part into the soft ring cover 15 through the through hole 13. This causes the soft ring cover 15 to expand laterally, and the ring cone 16 to press into the inner wall of the borehole. This not only increases the sealing performance of the sealing device in the borehole but also ensures the stability of the sealing device within the borehole. Simultaneously, the spring 20 is compressed, the movable rod 19 moves downward, causing the first pressure plate 11 to move downward, thus allowing the water-absorbing resin filling layer 1 to... Instantly, the baffle 9 is pressed out into the connector 1, so that the water-absorbing resin particles are effectively filled between the soft baffle rings 6. Under the action of water seeping from the inner wall of the borehole into the space between the soft baffle rings 6, the water-absorbing resin particles begin to absorb water and expand rapidly until they effectively fill the space composed of the soft baffle rings 6, the side skirts 8 and the inner wall of the borehole. Since the water-absorbing resin is softer than rubber after absorbing water, it effectively wraps the particles of all sizes on the inner wall of the borehole and effectively fills each water-permeable gap. The water-sealing performance of the lower layer of this water-stopping device is better. In addition, due to its unique water absorption effect, it enhances the overall water-stopping ability when water comes out from the inner wall of the borehole, so the water-stopping stability is better.

[0035] Preparation for use: After completing the pumping test, stop the air supply from the compressed air station. Under the rebound force of the spring 20, push the second pressure plate 21 upward, thereby moving the movable rod 19 and the first pressure plate 11 upward. Not only is the air in the soft ring cover 15 sucked into the connector 1 through the through hole 13, but the water-absorbing resin is also sucked into the connector 1. Pull up the air connection hose 26 until the water-stopping device exits the drill hole. Rotate the connector 1 away from the through pipe 23 and pull the first pressure plate 11 out of the connector 1. Finally, pour out the water-absorbing resin, wipe off the water stains, and reinsert a baffle 9 tightly from the lower end of the connector 1. Then, fill an appropriate amount of unabsorbed water-absorbing resin into the upper end of the connector 1. Insert the first pressure plate 11 into the connector 1 and lock the connector 1 onto the through pipe 23. It is then ready for the next water-stopping use.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A layered water-stopping device for pumping tests in exploration wells, characterized in that: The device includes a first connector (1), a side ring (2) at the bottom of the first connector (1), a connecting rod (3) uniformly connected to the lower end of the first connector (1) in a circumferential direction, and a support plate (4) connected to the bottom of the connecting rod (3). The outer edges of the side ring (2) and the support plate (4) are uniformly provided with a ring groove (5) in a circumferential direction, and a soft retaining ring (6) is provided in the ring groove (5). A baffle plate (9) is provided at the inner bottom of the first connector (1). A water-absorbing resin filling layer (10) is provided inside the first connector (1). A first pressure plate (11) is provided inside the first connector (1) and above the water-absorbing resin filling layer (10). A first sealing ring (12) is provided on the outer edge of the first pressure plate (11) and the first sealing ring (12) is pressed against the inner wall of the first connector (1). The first connector (1) is provided with through holes (13) evenly arranged in a circumferential direction. The first connector (1) is provided with an outer ring (14) at both the upper and lower positions of the through holes (13). A soft ring cover (15) is provided inside the outer ring (14) and the soft ring cover (15) is connected to the inside of the first connector (1) through the through holes (13). A through pipe (23) is screwed to the top of the first connector (1). A vent hole (18) is provided evenly in a circumferential direction at the bottom of the through pipe (23) and the through pipe (23) is connected to the first connector (1) through the vent hole (18). A movable rod (19) is connected to the top of the first pressure plate (11). The movable rod (19) passes through the bottom of the through pipe (23) to the inside of the through pipe (23). A second pressure plate (21) is connected to one end of the movable rod (19) that passes through the through pipe (23). The second pressure plate (21) is located inside the through pipe (23). An external air pressurization pipe is connected to the top of the through pipe (23). The top of the pipe (23) is screwed with a top cover (24), and a second pipe (25) is provided on the top cover (24). A connecting hose (26) is connected to the second pipe (25), and the connecting hose (26) is connected to an external compressed air station.

2. The stratified water-stopping device for pumping tests in exploration wells according to claim 1, characterized in that: Both the side ring (2) and the support plate (4) are uniformly provided with support plates (7) in the circumferential direction. The support plates (7) are fixed and supported on the soft retaining ring (6).

3. The stratified water-stopping device for pumping tests in exploration wells according to claim 1, characterized in that: The outer edge of the soft retaining ring (6) is provided with a side skirt (8).

4. The stratified water-stopping device for pumping tests in exploration wells according to claim 1, characterized in that: The outer wall of the soft ring cover (15) is provided with a ring cone (16).

5. The stratified water-stopping device for pumping tests in exploration wells according to claim 1, characterized in that: The outer edge of the second pressure plate (21) is provided with a second sealing ring (22), which is pressed against the inner wall of the through pipe (23). A spring (20) is sleeved on the movable rod (19), which is located inside the through pipe (23) and at the lower part of the second pressure plate (21).

6. A method for using a stratified water-stopping device for pumping tests in an exploration well according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Lowering into the borehole; Lower the water-stopping device into the borehole through the air hose (26) until it reaches the depth required for water stopping and then stop lowering; Step 2: Inflation expansion and water absorption expansion filling for water sealing; Start the compressed air station, and the compressed air station quickly discharges compressed air into the through pipe (23) through the air inlet hose (26). The compressed air quickly presses down on the second pressure plate (21), and the second pressure plate (21) presses the air at its lower part into the soft ring cover (15) through the through hole (13), so that the soft ring cover (15) expands laterally and the ring cone (16) is pressed into the inner wall of the borehole; Step 3: Prepare for use; After completing the pumping test, stop the air supply of the compressed air station, pull up the air connection hose (26) until the water-stopping device comes out of the drill hole, unscrew the first connector (1) from the through pipe (23), and pull out the first pressure plate (11) from the first connector (1). Finally, pour out the water-absorbing resin, wipe the water stains dry, and reinsert a baffle (9) tightly from the lower port of the first connector (1). Then, fill an appropriate amount of unabsorbed water-absorbing resin from the upper port of the first connector (1), insert the first pressure plate (11) into the first connector (1), and lock the first connector (1) onto the through pipe (23). It can then be put into use for the next water-stopping.

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