Stratified sampling packer

Abstract

The invention belongs to the technical field of packers, and provides a stratified sampling packer which comprises a filter, and an upper water stop plug and a lower water stop plug are arranged at the two ends of the filter respectively. The upper water stop plug comprises a central pipe, one end of the central pipe is fixedly connected with an upper connector, the outer wall of the central pipe is slidably connected with a floating head, the upper connector and the floating head are fixedly connected with rubber sleeve heads respectively, the central pipe is coaxially provided with a rubber sleeve, and the two rubber sleeve heads are fixedly connected with the two ends of the rubber sleeve respectively. A cavity is defined by the outer wall of the center pipe, the upper connector, the floating head, the rubber sleeve head and the rubber sleeve, the upper connector and the floating head are each provided with a two-way connector, and the two-way connectors communicate with the cavity. The cavity can be inflated through the two-way connector, at the moment, the pressure in the cavity is increased, the rubber sleeve is pushed to deform, the cavity expands, the floating head slides along the center pipe under the action of the pressure, and the axial length is shortened while the cavity expands.

Description

Technical Field

[0001] The invention belongs to the technical field of packers, in particular to a layered sampling packer. Background Art

[0002] A packer is a tool used in downhole operations. When the packer is lowered into the well and reaches the predetermined position, a certain method is used to expand its water-stop plug, which fits tightly against the well wall or casing, thereby achieving the isolation function.

[0003] During the drilling process, due to the different properties of the well wall rocks, there will be great differences in their surface roughness. Some hard rock well walls are relatively smooth, while the soft rock or broken zone well walls are relatively rough, and even have protruding fragments or holes. When faced with rough well walls or irregular well walls, traditional water-stop plugs cannot fit tightly to the well walls, resulting in poor sealing effect, prone to fluid leakage, and affecting the effect of stratified sampling.

[0004] Therefore, those skilled in the art have proposed a stratified sampling packer to solve the problems raised in the background art. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a stratified sampling seal to solve the problem that the water stop plug in the existing technology cannot fit tightly against the well wall when the well wall is rough or irregular, resulting in poor sealing effect, easy fluid leakage, and affecting the effect of stratified sampling.

[0006] A stratified sampling packer comprises a filter, wherein both ends of the filter are respectively provided with an upper water stop plug and a lower water stop plug;

[0007] The upper water-stop plug includes a center tube, one end of the center tube is fixedly connected to an upper joint, the outer wall of the center tube is slidably connected to a floating head, the upper joint and the floating head are respectively fixedly connected to a rubber cylinder head, the center tube is coaxially provided with a rubber sleeve, the two rubber cylinder heads are respectively fixedly connected to the two ends of the rubber sleeve, the outer wall of the center tube, the upper joint, the floating head, the rubber cylinder head and the rubber sleeve form a chamber, the upper joint and the floating head are respectively provided with two-way joints, and the two-way joints are connected to the chamber.

[0008] Preferably, a steel wire is provided in the rubber sleeve.

[0009] Preferably, a step groove is provided at one end of the upper joint and the floating head close to the rubber barrel head, and a step protrusion is provided at one end of the rubber barrel head close to the upper joint or the floating head, and the shape of the step protrusion is adapted to the shape of the step groove.

[0010] Preferably, the other end of the central tube is fixedly connected to a lower joint, a first sealing ring is provided at the connection between the central tube and the upper joint, the floating head and the lower joint, and a second sealing ring is provided at the connection between the rubber cylinder head and the upper joint and the floating head.

[0011] Preferably, the lower water-stopping plug has the same structure as the upper water-stopping plug.

[0012] Preferably, the upper end of the filter is connected to a transfer tube, the transfer tube passes through the central tube of the upper water stop plug and is connected to a submersible pump, the submersible pump is connected to a platform pipe, and the central tube of the lower water stop plug is connected to the lower end of the filter.

[0013] Preferably, the transfer tube is provided with a downhole valve, the outer wall of the transfer tube is provided with a first installation chamber, and the downhole valve is located in the first installation chamber.

[0014] Preferably, a second installation chamber is provided on the outer wall of the transfer tube, a sensor is provided in the second installation chamber, and probes of the sensor extend to the transfer tube, the upper water stop plug and the lower water stop plug respectively.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention can inflate the chamber through a two-way joint. At this time, the pressure in the chamber increases, pushing the rubber sleeve to deform, the chamber to expand, and the floating head slides along the central tube under the action of pressure. As the chamber expands, the axial length becomes shorter, so that the rubber sleeve can more evenly fill the unevenness of the well wall, thereby better fitting the well wall, improving the sealing effect, and reducing the possibility of fluid leakage.

[0017] 2. The present invention can effectively isolate fluids in different layers by cooperating with the upper water-stop plug and the lower water-stop plug, thereby avoiding the mixing of fluids in different layers, thereby ensuring that the samples taken can truly reflect the properties of the fluid in the target layer, improving the accuracy of stratified sampling, and accurately filtering and sampling the fluid in a specific target layer through the filter located between the upper water-stop plug and the lower water-stop plug, providing more reliable data support for subsequent hydrological analysis, etc.

[0018] 3. The present invention can improve the strength and tensile properties of the rubber sleeve by arranging the steel wire inside the rubber sleeve. When facing large pressure and tension underground, the steel wire can prevent the rubber sleeve from excessive deformation or damage, thereby extending the service life of the rubber sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall schematic diagram of a stratified sampling packer;

[0020] Figure 2 It is a front view of a stratified sampling packer;

[0021] Figure 3 A partial cross-sectional view of an upper water stop plug of a stratified sampling packer;

[0022] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0023] In the picture:

[0024] 1. Filter; 2. Upper water-stop plug; 201. Center tube; 202. Upper joint; 203. Floating head; 204. Rubber sleeve; 205. Rubber sleeve; 206. Chamber; 207. Two-way joint; 208. Lower joint; 209. First sealing ring; 210. Second sealing ring; 3. Lower water-stop plug; 4. Steel wire; 5. Step groove; 6. Step protrusion; 7. Adapter tube; 8. Submersible pump; 9. Platform pipe; 10. First installation chamber; 11. Second installation chamber. DETAILED DESCRIPTION

[0025] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0026] Example 1

[0027] As attached Figure 1 To the attached Figure 4 As shown, this embodiment provides a stratified sampling packer, including a filter 1, which filters the fluid between the upper water stop plug 2 and the lower water stop plug 3. The filter 1 can filter out impurities such as mud, rock debris, etc. in the fluid, ensure the purity of the extracted fluid sample, provide accurate samples for subsequent hydrological analysis, and reduce the damage of impurities to the submersible pump 8. The upper water stop plug 2 and the lower water stop plug 3 are respectively provided at both ends of the filter 1. The upper water stop plug 2 and the lower water stop plug 3 expand and tightly fit the well wall to form a sealing barrier. The expanded upper water stop plug 2 and the lower water stop plug 3 isolate the fluids in different layers, prevent mutual interference and mixing between the fluids, and ensure the accuracy of stratified sampling;

[0028] The upper water-stop plug 2 includes a central tube 201, wherein the central tube 201 serves as the skeleton of the upper water-stop plug 2 and provides support for other structures. A channel is also formed inside the central tube 201 to help the transfer tube 7 transport fluid. One end of the central tube 201 is fixedly connected to an upper joint 202, wherein the upper joint 202 of the upper water-stop plug 2 is connected to the second installation chamber 11, and the upper joint 202 of the lower water-stop plug 3 is connected to the filter 1. The outer wall of the central tube 201 is slidably connected to a floating head 203. When the chamber 206 is inflated, the rubber sleeve 205 is deformed, and the floating head 203 slides along the central tube 201 as the pressure changes, so that the axial length of the chamber 206 shortens while expanding, so that the rubber sleeve 205 fills the unevenness of the well wall more evenly, thereby improving the sealing effect. The upper joint 202 and the floating head 203 are respectively fixedly connected to a rubber sleeve head 204. Under the action of pressure, the rubber sleeve head 204 transmits the pressure evenly. The rubber sleeve 205 is handed to the well so that the rubber sleeve 205 can deform evenly, fit the well wall better, form a sealing barrier, and prevent the fluid from flowing between different layers. The central pipe 201 is coaxially provided with a rubber sleeve 205, and two rubber sleeve heads 204 are fixedly connected to the two ends of the rubber sleeve 205 respectively. The outer wall of the central pipe 201, the upper joint 202, the floating head 203, the rubber sleeve head 204 and the rubber sleeve 205 enclose a chamber 206. The upper joint 202 and the floating head 203 are respectively provided with two-way joints 207, which are connected to the chamber 206. The two-way joints 207 are connected to the external air supply system. Air can be inflated into the chamber 206 through the two-way joints 207, thereby deforming the rubber sleeve 205 and expanding the chamber 206. Multiple two-way joints 207 can realize series or parallel air supply to the upper water stop plug 2 and the lower water stop plug 3. Either one air supply system or multiple separate air supply systems can be used.

[0029] Specifically, a steel wire 4 is provided in the rubber sleeve 205. The steel wire 4 can improve the strength and tensile performance of the rubber sleeve 205. When facing greater pressure and tension underground, the steel wire 4 can prevent the rubber sleeve 205 from excessive deformation or damage, thereby extending the service life of the rubber sleeve 205. After the gas in the chamber 206 is released, the rubber sleeve 205 quickly recovers its shape. The rubber sleeve 205 is easy to obtain, which provides convenience for later replacement and maintenance.

[0030] Furthermore, a step groove 5 is provided at one end of the upper joint 202 and the floating head 203 close to the rubber barrel head 204, and a step protrusion 6 is provided at one end of the rubber barrel head 204 close to the upper joint 202 or the floating head 203. The step protrusion 6 is adapted to the shape of the step groove 5. The step protrusion 6 cooperates with the step groove 5 to increase the contact area and friction between the upper joint 202, the floating head 203 and the rubber barrel head 204, thereby improving the stability of the connection between the upper joint 202, the floating head 203 and the rubber barrel head 204.

[0031] Furthermore, the other end of the central tube 201 is fixedly connected to a lower joint 208, wherein the lower joint 208 of the upper water stop plug 2 is connected to the filter 1, and the lower joint 208 of the lower water stop plug 3 can also be connected to a new filter 1 as needed. A first sealing ring 209 is provided at the connection between the central tube 201 and the upper joint 202, the floating head 203, and the lower joint 208, and a second sealing ring 210 is provided at the connection between the rubber barrel head 204 and the upper joint 202 and the floating head 203. The first sealing ring 209 and the second sealing ring 210 can prevent fluid leakage from the connection, enhance the sealing performance, and compensate for errors in processing precision.

[0032] Furthermore, the lower water stop plug 3 has the same structure as the upper water stop plug 2. According to the coordination between the upper water stop plug 2, the filter 1 and the lower water stop plug 3, if necessary, a new filter 1 and a new lower water stop plug 3 can be added to the lower end of the original lower water stop plug 3, so as to carry out multi-layer hydrological sampling simultaneously.

[0033] As can be seen from the above, the external air supply system fills chamber 206 with industrial nitrogen through two-way connector 207, thereby increasing the pressure in chamber 206, causing chamber 206 to expand and push rubber sleeve 205 to deform. Under the action of pressure, floating head 203 slides along central tube 201, and chamber 206 shortens in axial length as it expands, allowing rubber sleeve 205 to more evenly fill the unevenness of the wellbore wall and fit tightly against the wellbore wall, improving the sealing effect and reducing the possibility of fluid leakage. Steel wire 4 improves the strength and tensile strength of rubber sleeve 205, extending its service life. Upper water stop plug 2 and lower water stop plug 3 expand and fit tightly against the wellbore wall to form a sealing barrier, isolating fluids from different layers and preventing mutual interference and mixing between the fluids. Filter 1 filters the fluid in the target layer, removing impurities such as mud, sand, and rock fragments from the fluid, ensuring the purity of the extracted fluid sample, providing accurate samples for subsequent hydrological analysis, and ensuring the accuracy of stratified sampling.

[0034] Example 2

[0035] As attached Figure 1 To the attached Figure 4 As shown, this embodiment is basically the same as the previous embodiment, with the difference that the upper end of the filter 1 is connected to a transfer pipe 7, which connects the filter 1 and the submersible pump 8, serving as a channel for the fluid to flow from the filter 1 to the submersible pump 8, thereby ensuring the smooth flow of the fluid inside the packer. The transfer pipe 7 passes through the central tube 201 of the upper water-stop plug 2 and is connected to the submersible pump 8. The main function of the submersible pump 8 is to extract the fluid after being filtered by the filter 1 to achieve the purpose of stratified sampling. The submersible pump 8 is connected to the platform pipe 9, and the central tube 201 of the lower water-stop plug 3 is connected to the lower end of the filter 1.

[0036] Specifically, the transfer tube 7 is provided with a downhole valve, and a first installation chamber 10 is provided on the outer wall of the transfer tube 7 . The downhole valve is located in the first installation chamber 10 , wherein the downhole valve is used to control the flow of fluid in the transfer tube 7 .

[0037] Furthermore, a second installation chamber 11 is provided on the outer wall of the transfer tube 7, and sensors are provided in the second installation chamber 11, wherein the sensors include a pressure sensor and a temperature sensor, and the probes of the sensors extend to the transfer tube 7, the upper water stop plug 2 and the lower water stop plug 3 respectively. The pressure and temperature parameters of the transfer tube 7, the upper water stop plug 2 and the lower water stop plug 3 are monitored by the sensors, providing important data support for downhole operations.

[0038] As can be seen from the above, the external air supply system fills the chamber 206 with industrial nitrogen through the two-way joint 207, the upper water stop plug 2 and the lower water stop plug 3 expand and fit tightly against the well wall to form a sealed barrier, and the submersible pump 8 extracts the fluid filtered by the filter 1. The extracted fluid is used for hydrological analysis, and the downhole valve is used to control the flow of the fluid in the transfer tube 7, thereby controlling the extraction of the fluid. During the fluid extraction process, the pressure and temperature parameters in the area of ​​the transfer tube 7, the upper water stop plug 2, and the lower water stop plug 3 are monitored by sensors to provide important data support for downhole operations.

[0039] In the drawings of the embodiments disclosed in the present invention, only the structures involved in the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0040] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0041] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] In the description of this specification, the reference terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

Claims

1. A stratified sampling packer, characterized by: It comprises a filter (1), wherein an upper water stop plug (2) and a lower water stop plug (3) are respectively provided at both ends of the filter (1); The upper water-stop plug (2) comprises a central tube (201), one end of the central tube (201) is fixedly connected to an upper joint (202), the outer wall of the central tube (201) is slidably connected to a floating head (203), the upper joint (202) and the floating head (203) are respectively fixedly connected to a rubber sleeve head (204), the central tube (201) is coaxially provided with a rubber sleeve (205), the two rubber sleeve heads (204) are respectively fixedly connected to the two ends of the rubber sleeve (205), the outer wall of the central tube (201), the upper joint (202), the floating head (203), the rubber sleeve head (204) and the rubber sleeve (205) enclose a chamber (206), the upper joint (202) and the floating head (203) are respectively provided with a two-way joint (207), and the two-way joint (207) is communicated with the chamber (206).

2. A stratified sampling packer according to claim 1, characterized in that: A steel wire (4) is arranged inside the rubber sleeve (205).

3. A stratified sampling packer according to claim 2, characterized in that: A step groove (5) is provided on one end of the upper joint (202) and the floating head (203) close to the rubber barrel head (204), and a step protrusion (6) is provided on one end of the rubber barrel head (204) close to the upper joint (202) or the floating head (203), and the shape of the step protrusion (6) is adapted to the shape of the step groove (5).

4. A stratified sampling packer according to claim 3, characterized in that: The other end of the central tube (201) is fixedly connected to a lower joint (208); a first sealing ring (209) is provided at the connection between the central tube (201) and the upper joint (202), the floating head (203), and the lower joint (208); a second sealing ring (210) is provided at the connection between the rubber cylinder head (204) and the upper joint (202) and the floating head (203).

5. The stratified sampling packer according to claim 4, characterized in that: The lower water stop plug (3) has the same structure as the upper water stop plug (2).

6. A stratified sampling packer according to claim 1 or 5, characterized in that: The upper end of the filter (1) is connected to a transfer pipe (7), the transfer pipe (7) passes through the central pipe (201) of the upper water stop plug (2) and is connected to a submersible pump (8), the submersible pump (8) is connected to a platform pipe (9), and the central pipe (201) of the lower water stop plug (3) is connected to the lower end of the filter (1).

7. The stratified sampling packer according to claim 6, characterized in that: The transfer tube (7) is provided with a downhole valve, the outer wall of the transfer tube (7) is provided with a first installation chamber (10), and the downhole valve is located in the first installation chamber (10).

8. The stratified sampling packer according to claim 7, characterized in that: The outer wall of the transfer tube (7) is provided with a second installation chamber (11), and a sensor is provided in the second installation chamber (11), and the probes of the sensor extend to the transfer tube (7), the upper water stop plug (2), and the lower water stop plug (3) respectively.

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