Small-diameter intelligent separate mining device, pipe column and construction method

Abstract

The application discloses a small-diameter intelligent separate mining device, a pipe column and a construction method. The separate mining device comprises, from top to bottom, a piston control mechanism, a spring position mechanism, a damping mechanism and an oil nozzle adjusting mechanism. The small-diameter intelligent separate mining device adopts a liquid control pipeline pressing mode, a plurality of clamping mechanisms are arranged, and the liquid control pressure and flow of each layer are monitored, so that multi-stage flow control under different pressures is realized.

Description

Technical Field

[0001] This invention relates to the field of stratified oil production tubing technology in the petroleum industry, specifically a small-diameter intelligent stratified oil production device, tubing, and construction method. Background Technology

[0002] Shengli Oilfield has entered the mid-to-late stage of development. Long-term water injection has further exacerbated inter-layer interference. Layered well development can effectively improve reservoir utilization and ultimately enhance oil recovery. With the development of layered oil production technology, it is mainly classified into four types according to control methods: hydraulic control, electro-hydraulic control, electro-hydraulic integrated control, and wireless pressure pulse control. Hydraulic control and electro-hydraulic control are currently mature systems used abroad. Domestic offshore oilfields have also correspondingly adopted hydraulic and electro-hydraulic layered oil production methods. However, this series of technologies mostly uses Y-type joints, equipped with hydraulically controlled mechanical or electrically controlled sliding sleeves, and is mainly used in 95 / 8 casing. Moreover, the flow rate cannot be controlled. Currently, sand control in oil and water wells mainly relies on gravel packing and mechanical filter hanging. After sand control, the inner diameter of 7-inch casing is less than 100mm, which brings certain difficulties to achieving layered oil production and flow control in 7-inch casing wellbores. Therefore, it is necessary to design small-diameter intelligent segregation technology that can achieve multi-level, multi-flow control in the sand control tubing string. At the same time, Shengli offshore oilfield has already carried out the application of chemical flooding technology. When the segregation switch encounters polymer, it requires greater adjustment driving force for downhole regulation.

[0003] A search revealed that application number 202010328388.3 discloses a downhole hydraulic system for controlling six-layer sliding sleeves via three pipelines. The system includes surface equipment, six downhole decoder systems, six packers, casing, tubing, and other components. A set of downhole decoder systems and packers is deployed in each exploited reservoir to isolate the annulus within the wellbore, creating an independent space for each layer. Each downhole decoder system includes a decoder, a pressure relief valve, a sliding sleeve, a check valve, and a tubing opening. The decoder is connected to the sliding sleeve via the pressure relief valve, and the tubing opening is connected to the pressure relief valve via the check valve. The pressure relief valve in the decoder system effectively reduces the surface injection pressure. Power is transmitted to the decoder system via three hydraulic pipelines, allowing for independent decoding and control of the sliding sleeves in up to six reservoirs. This precise inter-layer control balances inter-layer imbalances and improves the final recovery rate. Application No. 202010328374.1 discloses a control method for a six-level sliding sleeve controlled by three hydraulic lines. Three hydraulic lines are sequentially connected from the surface hydraulic station towards the well bottom to the surface hydraulic control equipment and six downhole hydraulic control systems. The opening state of the decoders in the six downhole hydraulic control systems is controlled separately by controlling the oil pressure of the three hydraulic lines. Once the decoder in the target downhole hydraulic control system is opened, the oil pressure supplied to the decoder by the corresponding hydraulic line is increased to the required operating pressure of the sliding sleeve according to the control requirements for controlling the sliding sleeve's movement direction. This opens the pathway between the decoder, pressure relief valve, sliding sleeve, check valve, and tubing opening in the downhole hydraulic control system for that level, thus propelling the sliding sleeve to move and achieving downhole layered control. Both of these patents involve decoders in hydraulic control systems. This tool has many seals and a complex structure; if even one seal fails, the entire system loses its layered control function.

[0004] After searching, application number 201611227503.8 discloses an intelligent stratified oil production tubing string for highly deviated wells and its operation method. Specifically, it discloses an intelligent stratified oil production tubing string for highly deviated wells, including a stratified production tubing string; the stratified production tubing string includes a perforated pipe and a round plug, with a cross-cable positioning seal between the perforated pipe and the round plug, several stratified production distribution devices and at least one cross-cable insertion seal; each of the stratified production distribution devices is connected to a ground controller connected to a host computer via a steel armored cable; each stratified production distribution device corresponds to a different oil layer, and the sealing between different layers is achieved through the cross-cable positioning seal and the cross-cable insertion seal; its operation method is as follows: (1) well cleaning; (2) after the stratified production distribution device is tested and found to be normal, the tubing string and steel armored cable of the present invention are lowered; (3) the tubing string of the present invention is verified for sealing; (4) pump production is started; (5) acidizing at a fixed point. It can achieve online stepless control of stratified oil production in highly deviated wells, and can also implement targeted acidizing according to production requirements. This technology adopts an electric control method, which has a small adjustment driving force. It is difficult to adjust after the well switch encounters polymer or after the well has scaled up, and cannot achieve long-term effective adjustment.

[0005] A search revealed that application number 201811626784.3 discloses a downhole hydraulically controlled starting sliding sleeve control system and method. Specifically, this system sends control commands to the downhole hydraulically controlled starting sliding sleeve by transmitting pressure waves or electromagnetic waves from the surface to the downhole. Downhole sensors installed on the sliding sleeve measure the control commands sent from the surface and transmit them to the downhole control circuit board. The downhole control circuit board, upon determining that the command is correct, controls the downhole solenoid valve to open. Fluid from inside the wellbore flows through the downhole solenoid valve into the upper cavity of the downhole hydraulically controlled starting sliding sleeve, pushing the piston rod downwards to open the sleeve. This eliminates the need for ball dropping or running coiled tubing to open the sliding sleeve, saving significant time and cost. However, this system can only control the opening; once opened, it cannot be adjusted again, resulting in limited opening and closing capabilities. Summary of the Invention

[0006] To address the aforementioned deficiencies in existing technologies, the present invention aims to provide a small-diameter intelligent mining device, a tubing, and a construction method. This small-diameter intelligent mining tubing integrates the mining tubing with the production tubing. By minimizing the diameter of the mining tubing, the internal insertion requirements of the sand-control tubing are met. The small-diameter intelligent mining device employs a hydraulically controlled pipeline pressurization method. Through a multi-stage clamping mechanism and monitoring of the hydraulic pressure and flow rate at each layer, multi-stage flow control under different pressures is achieved.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A small-diameter intelligent sampling device includes a piston control mechanism, a spring position mechanism, a damping mechanism, and an oil nozzle adjustment mechanism connected in sequence from top to bottom.

[0009] Furthermore, the piston control mechanism includes a sealing sleeve, a cylindrical piston one, and a cylindrical piston two;

[0010] The sealing sleeve has two axial cylindrical piston chambers, namely cylindrical piston chamber one and cylindrical piston chamber two. Cylindrical piston chamber one is installed in cylindrical piston chamber one, and cylindrical piston chamber two is installed in cylindrical piston chamber two.

[0011] The lower ends of both cylindrical piston one and cylindrical piston two are connected to the central tube of the spring position mechanism.

[0012] The upper end of the sealing sleeve is connected to the upper connector, and the upper connector has an upper connector hydraulic control channel. The upper end of the cylindrical piston cavity is connected to the upper connector hydraulic control channel.

[0013] Furthermore, the spring position mechanism includes an outer sleeve, a central tube, and a large spring;

[0014] The outer sleeve is fitted outside the central tube, with the upper end of the outer sleeve connected to the sealing sleeve of the piston control mechanism and the lower end of the outer sleeve connected to the damping sleeve of the damping mechanism.

[0015] The large spring is placed inside the outer sleeve, with the upper end of the large spring pressing against the central tube via an upper adjusting shim, and the lower end of the large spring pressing against the damping sleeve via a lower adjusting shim.

[0016] Furthermore, the damping mechanism is a multi-stage damping mechanism, which includes a damping tube, a damping sleeve, and a damper;

[0017] The damping tube is located inside the damping sleeve. The upper end of the damping tube is connected to the central tube, and the lower end of the damping tube is connected to the adjusting core of the oil nozzle adjusting mechanism.

[0018] The inner wall of the damping sleeve has at least two layers of damper mounting slots, each layer having at least three damper mounting slots. The dampers are installed in the damper mounting slots, and the force of the dampers acts on the outer wall of the damping tube.

[0019] Furthermore, the damper includes a support ring, a spring sleeve, a damping ball, and a small spring;

[0020] The support ring is installed in the damper mounting groove. The inside of the support ring has a space to accommodate the damping ball, and a small opening is opened at the inner end of the support ring to expose the damping ball. The diameter of the small opening is smaller than the diameter of the damping ball. The outer end of the support ring is connected to a spring sleeve, the inner end of the small spring is connected to the damping ball, and the outer end of the small spring is connected to the spring sleeve.

[0021] Furthermore, the nozzle adjustment mechanism includes an adjustment core, a pressure ring, a vulcanizing ring, and a nozzle sleeve;

[0022] The upper end of the adjusting core is connected to the damping tube of the damping mechanism, and the upper end of the oil nozzle sleeve is connected to the damping sleeve of the damping mechanism; a radially penetrating adjusting hole is opened in the middle of the oil nozzle sleeve.

[0023] The lower half of the outer wall of the adjusting core has at least three steps with a decreasing diameter from top to bottom, and a pressure ring and a vulcanizing ring are installed between the upper half of the outer wall of the adjusting core and the inner wall of the damping sleeve.

[0024] To achieve the above objectives, the present invention adopts the following technical solution:

[0025] A small-diameter intelligent production line includes an external sand control line and an internal production line; wherein the sand control line is equipped with sand control packers between different oil layers, and the production line is equipped with production packers between different oil layers.

[0026] The production string is equipped with a small-diameter intelligent production device for different oil layers. The small-diameter intelligent production device includes a piston control mechanism, a spring position mechanism, a damping mechanism, and an oil nozzle adjustment mechanism connected in sequence from top to bottom.

[0027] Furthermore, the piston control mechanism includes a sealing sleeve, a cylindrical piston one, and a cylindrical piston two;

[0028] The sealing sleeve has two axial cylindrical piston chambers, namely cylindrical piston chamber one and cylindrical piston chamber two. Cylindrical piston chamber one is installed in cylindrical piston chamber one, and cylindrical piston chamber two is installed in cylindrical piston chamber two.

[0029] The lower ends of both cylindrical piston one and cylindrical piston two are connected to the central tube of the spring position mechanism.

[0030] The upper end of the sealing sleeve is connected to the upper connector, and the upper connector has an upper connector hydraulic control channel. The upper end of the cylindrical piston cavity is connected to the upper connector hydraulic control channel, and the upper connector hydraulic control channel is connected to an electronic pressure flow meter.

[0031] Furthermore, the spring position mechanism includes an outer sleeve, a central tube, and a large spring;

[0032] The outer sleeve is fitted outside the central tube, with the upper end of the outer sleeve connected to the sealing sleeve of the piston control mechanism and the lower end of the outer sleeve connected to the damping sleeve of the damping mechanism.

[0033] The large spring is placed inside the outer sleeve, with the upper end of the large spring pressing against the central tube via an upper adjusting shim, and the lower end of the large spring pressing against the damping sleeve via a lower adjusting shim.

[0034] Furthermore, the damping mechanism is a multi-stage damping mechanism, which includes a damping tube, a damping sleeve, and a damper;

[0035] The damping tube is located inside the damping sleeve. The upper end of the damping tube is connected to the central tube, and the lower end of the damping tube is connected to the adjusting core of the oil nozzle adjusting mechanism.

[0036] The inner wall of the damping sleeve has at least two layers of damper mounting slots, each layer having at least three damper mounting slots. The dampers are installed in the damper mounting slots, and the force of the dampers acts on the outer wall of the damping tube.

[0037] The damper includes a support ring, a spring sleeve, a damping ball, and a small spring;

[0038] The support ring is installed in the damper mounting groove. The inside of the support ring has a space to accommodate the damping ball, and a small opening is opened at the inner end of the support ring to expose the damping ball. The diameter of the small opening is smaller than the diameter of the damping ball. The outer end of the support ring is connected to a spring sleeve, the inner end of the small spring is connected to the damping ball, and the outer end of the small spring is connected to the spring sleeve.

[0039] Furthermore, the nozzle adjustment mechanism includes an adjustment core, a pressure ring, a vulcanizing ring, and a nozzle sleeve;

[0040] The upper end of the adjusting core is connected to the damping tube of the damping mechanism, and the upper end of the oil nozzle sleeve is connected to the damping sleeve of the damping mechanism; a radially penetrating adjusting hole is opened in the middle of the oil nozzle sleeve.

[0041] The lower half of the outer wall of the adjusting core has at least three steps with a decreasing diameter from top to bottom, and a pressure ring and a vulcanizing ring are installed between the upper half of the outer wall of the adjusting core and the inner wall of the damping sleeve.

[0042] To achieve the above objectives, the present invention adopts the following technical solution:

[0043] A construction method for a small-diameter intelligent production line includes the following steps: Pressure is applied to a small-diameter intelligent production device in one of the oil-producing layers via the main hydraulic control line. A cylindrical piston pushes the central tube, which in turn drives the damping tube. The damping tube then drives the adjusting core, causing a change in the flow orifice diameter created by the adjusting core and the adjusting hole of the nozzle sleeve. When the flow rate reaches the desired set flow rate, the pressure on the hydraulic control line is stopped, and the damping mechanism is locked, thus adjusting the opening of the downhole production device. When it is necessary to close the oil-producing layer, the hydraulic control line continues to pressurize. When the upper and lower sulfurized rings cover the injection port of the nozzle sleeve, the adjusting hole is completely blocked, thus closing the oil production channel of the oil-producing layer.

[0044] Furthermore, the regulating core adopts a multi-stage step design to achieve multiple throttling differential pressure control.

[0045] Furthermore, the electrical control switch of the ground control cabinet controls the electrical control fluid distribution device through the armored cable, opening the fluid control channel for controlling the small-diameter intelligent sub-production device of one of the oil production layers. Then, the fluid control switch of the ground control cabinet is connected to the electrical control fluid distribution device through the main fluid control pipeline, and the electrical control fluid distribution device then pressurizes the small-diameter intelligent sub-production device of the current oil production layer through the branch fluid control pipeline.

[0046] Compared with the prior art, the present invention has the following advantages:

[0047] (1) By adopting a small-diameter intelligent distribution device and an electro-hydraulic distribution device, the flow control of the downhole switch is realized by one main hydraulic control pipeline and one armored cable, which simplifies the number of most pipelines in the wellbore.

[0048] (2) The small-diameter intelligent production device is designed with an outer diameter of φ80mm, which enables safe entry into the current mature oil well sand control technology;

[0049] (3) The small-diameter intelligent mining device adopts the combination of cylindrical piston one and cylindrical piston two to realize the safe depth of deep well switch;

[0050] (4) The small-diameter intelligent oil extraction device adopts a multi-stage damping mechanism and a small cylindrical piston design to achieve multi-stage control under wide pressure range (the pressure is transmitted from the downhole electronic pressure gauge to the surface control cabinet) to prevent the size of the oil nozzle from changing under pressure fluctuations and to ensure quantitative adjustment.

[0051] (5) A multi-stage step design is adopted to achieve multiple throttling pressure differential control. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of a small-diameter intelligent sampling pipe column structure according to the present invention;

[0053] Figure 2 This is a schematic diagram of the small-diameter intelligent sampling device of the present invention;

[0054] Figure 3 A schematic diagram of the structure of this invention applied to the production of electric pumps;

[0055] Figure 4 A schematic diagram of the structure of this invention applied to the production of tubular pumps;

[0056] Figure 5 A schematic diagram of the structure of this invention applied to the production of rod pumps;

[0057] Figure 6 This is an enlarged view of part A of the small-diameter intelligent sampling device.

[0058] In the diagram: 1. Sand filter pipe, 2. Separate sampling packer, 3. Sand prevention packer, 4. Small diameter intelligent separate sampling device, 5. Electronic pressure flow meter, 6. Suspended packer, 7. Positioning device, 8. Hydraulic control line 1, 9. Hydraulic control line 2, 10. Electrically controlled hydraulic distribution device, 11. Armored cable, 12. Sleeve, 13. Oil pipe, 14. Ground control cabinet, 15. Large plug, 16. Small plug, 17. Main hydraulic control line;

[0059] 18 Electric pump reinforcement device; 19 Electric pump; 20 Cable; 21 Flow control device; 22 Tube pump; 23 Rod pump;

[0060] 406 Coupling, 407 Upper Connector, 408 Sealing Sleeve, 409 Cylindrical Piston I, 410 Cylindrical Piston II, 411 Outer Sleeve, 412 Center Tube, 413 Adjusting Shim, 414 Large Spring, 415 Damping Tube, 416 Damping Sleeve, 417 Support Ring, 418 Spring Sleeve, 419 Damping Ball, 420 Small Spring, 421 Adjusting Core, 422 Pressure Ring, 423 Vulcanized Ring, 424 Oil Nozzle Sleeve, 425 Lower Connector, Damping Ring 426. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] Please see Figures 1 to 2 The small-diameter intelligent sampling pipe column is designed as an integrated sampling pipe column and production pipe column. By designing the sampling pipe column to be small in diameter, it meets the requirements for the internal insertion of the sand control pipe column. Its small-diameter intelligent sampling device adopts the hydraulic control pipeline pressure test method. Through the setting of multi-stage blocking mechanism and monitoring of the hydraulic control pressure and flow rate of each layer, it realizes multi-stage flow control under different pressures.

[0063] To achieve the above objectives, the present invention adopts the following technical solution: a small-diameter intelligent production string for a 7-inch layered sand control well includes an external sand control string, an internal production string, and a surface control cabinet, etc. The sand control string includes a large plug, a filter pipe, a sand control packer, a casing, and a suspended packer. The production string includes a small plug, a production packer, a small-diameter intelligent production device, a positioning device, tubing, and an electro-hydraulic distribution device. The filter pipe corresponds to a specific oil layer. The sand control packer seals two oil layers. The suspended packer suspends the entire sand control string. The large plug, filter pipe, sand control packer, and suspended packer are connected through the casing. The production packer seals the interior of the sand control string. The small-diameter intelligent production device corresponds to a specific oil layer. The positioning device positions the production string. The small plug, production packer, small-diameter intelligent production device, and positioning device are connected through tubing.

[0064] The electro-hydraulic distribution device is provided with a main hydraulic control pipeline interface and an armored cable interface at the upper end, and multiple hydraulic control pipeline interfaces and an armored cable interface at the lower end.

[0065] The electronic pressure gauge and flow meter are embedded inside the small-diameter intelligent sampling device and are connected to the corresponding armored cable interface at the lower end of the electro-hydraulic distribution device via the armored cable.

[0066] The small-diameter intelligent oil extraction device corresponding to different oil layers is connected to the corresponding hydraulic control line interface at the lower end of the electro-hydraulic circuit distribution device through hydraulic control line one and hydraulic control line two, respectively.

[0067] The upper end of the electro-hydraulic distribution device is connected to the ground control cabinet through a main hydraulic control pipeline and an armored cable. The main hydraulic control pipeline is a pipeline with a diameter of φ9.53mm or larger. The electro-hydraulic distribution device controls the internal motor through the armored cable to realize the channels of each hydraulic control pipeline in the well, and pressurizes each hydraulic control pipeline in the well through the main hydraulic control pipeline.

[0068] The small-diameter intelligent sampling device comprises an upper connector 406, a piston control mechanism, a spring positioning mechanism, a multi-stage damping mechanism, an oil nozzle adjustment mechanism, a lower connector 425, and rubber rings. The piston control mechanism includes a sealing sleeve 408, a first cylindrical piston 409, a second cylindrical piston 410, etc. The spring positioning mechanism includes a central tube 412, an adjusting shim 413, a large spring 414, and an outer sleeve 411, etc. The multi-stage damping mechanism includes a damping tube 415, a damping sleeve 416, a support ring 417, a spring sleeve 418, a damping ball 419, and a small spring 420, etc. The oil nozzle adjustment mechanism includes an adjusting core 421, a pressure ring 422, a vulcanizing ring 423, and an oil nozzle sleeve 424, etc. The coupling is threadedly connected to the upper connector, and the upper connector is threadedly connected to the sealing sleeve. The sealing sleeve is threaded to the outer sleeve, the outer sleeve is threaded to the damping sleeve, the damping sleeve is threaded to the oil nozzle sleeve, the oil nozzle sleeve is threaded to the lower connector, the cylindrical piston one and cylindrical piston two are symmetrically placed inside the sealing sleeve, the central tube is actively connected to cylindrical piston one and cylindrical piston two, the large spring is placed in the space between the outer sleeve and the damping tube, the damping sleeve is provided with multi-stage countersunk holes, the support ring and damping sleeve are placed inside the countersunk holes, the small spring and damping ball are placed inside the damping sleeve, the central tube is threaded to the damping tube, the damping tube is threaded to the adjusting core, the adjusting core is provided with steps, and the pressure ring and vulcanizing ring are provided between the adjusting core and the damping sleeve;

[0069] The coupling and the upper connector, the upper connector and the sealing sleeve, the cylindrical pistons one and two and the piston holes of the upper connector, the outer sleeve and the damping sleeve, the damping sleeve and the oil nozzle sleeve, and the oil nozzle sleeve and the lower connector are sealed and connected by the rubber ring.

[0070] The piston hole of the first cylindrical piston is connected to the hydraulic control line, while the piston hole of the second cylindrical piston is not connected to the hydraulic control line. The second cylindrical piston is used for auxiliary straightening and generates hydraulic control and thrust only through the first cylindrical piston.

[0071] A damping ring 426 is uniformly axially arranged on the outside of the damping tube. The inside of the damping ring is sprayed with a suitable amount and particle size of alumina or zircon, and other parts are smoothed.

[0072] The damping ball is externally coated with alumina or zircon of appropriate dosage and particle size;

[0073] The adjusting core has multiple steps of different diameters on its outer surface;

[0074] During on-site construction, following the structure shown in the diagram, the external sand control tubing is lowered in sequence, followed by the internal distribution tubing. The main hydraulic control line and armored cable are then connected to the surface control cabinet via the wellhead hanger. The cable serves two purposes: one is to control the distribution device 10, and the other is to connect the electronic pressure flow meter 5 of the intelligent distribution device for flow testing.

[0075] Taking the upper production layer as an example, the electrical control switch of the ground control cabinet controls the electrical control fluid distribution device through the armored cable, opening the fluid control channel of the small-diameter intelligent distribution device in the upper layer. Then, the fluid control switch of the ground control cabinet pressurizes the small-diameter intelligent distribution device in the upper layer through the main fluid control pipeline. The cylindrical piston pushes the central tube, the central tube drives the damping tube, and the damping tube drives the adjusting core. When the flow rate displayed by the electronic flow meter reaches the required set flow rate, the pressure of the fluid control pipeline stops. At this time, the damping mechanism is locked, realizing the adjustment of the opening of the downhole distribution device. When it is necessary to close the layer, the fluid control pipeline continues to pressurize. When the upper and lower sulfurized rings cover the oil nozzle injection port, the device in that layer is closed.

[0076] Example 1: As Figure 3 As shown, this stratified oil production tubing can be applied to electric pump production. The stratified oil production tubing is suspended by an electric pump reinforcement device, and the upper end of the electric pump is connected to a cable.

[0077] Example 2: Figure 4 As shown, this stratified oil production tubing string can be applied to tubular pump production. To achieve the setting of the hydraulic packer at the lower end of the tubular pump, a flow-through device is installed.

[0078] Example 3: As Figure 5 As shown, this stratified oil production tubing can be applied to rod pump production.

[0079] Furthermore, the ground control cabinet integrates a closed-loop self-control program. After a certain flow rate is set on the ground, the hydraulic control pipeline pressure is automatically adjusted to the required level based on the flow rate and pressure values ​​uploaded from the well, thereby adjusting the small-diameter intelligent distribution device to the appropriate position and realizing automatic flow control.

[0080] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field and will not be elaborated upon further. Examples include welding and threaded connections.

[0081] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0082] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0083] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A small diameter intelligent separate sampling device, characterized in that, It includes, from top to bottom, a piston control mechanism, a spring position mechanism, a damping mechanism, and an oil nozzle adjustment mechanism; The piston control mechanism includes a sealing sleeve, a cylindrical piston one, and a cylindrical piston two; The sealing sleeve has two axial cylindrical piston chambers, namely cylindrical piston chamber one and cylindrical piston chamber two. Cylindrical piston chamber one is installed in cylindrical piston chamber one, and cylindrical piston chamber two is installed in cylindrical piston chamber two. The lower ends of both cylindrical piston one and cylindrical piston two are connected to the central tube of the spring position mechanism. The upper end of the sealing sleeve is connected to the upper connector, the upper connector has an upper connector hydraulic control channel, and the upper end of the cylindrical piston cavity is connected to the upper connector hydraulic control channel; the upper connector hydraulic control channel is connected to the hydraulic control pipeline. The spring positioning mechanism includes an outer sleeve, a central tube, and a large spring; The outer sleeve is fitted outside the central tube, with the upper end of the outer sleeve connected to the sealing sleeve of the piston control mechanism and the lower end of the outer sleeve connected to the damping sleeve of the damping mechanism. The large spring is placed inside the outer sleeve, with the upper end of the large spring pressing against the central tube through the upper adjusting shim, and the lower end of the large spring pressing against the damping sleeve through the lower adjusting shim. The damping mechanism is a multi-stage damping mechanism, which includes a damping tube, a damping sleeve, and a damper. The damping tube is located inside the damping sleeve. The upper end of the damping tube is connected to the central tube, and the lower end of the damping tube is connected to the adjusting core of the oil nozzle adjusting mechanism. The inner wall of the damping sleeve has at least two layers of damper mounting slots, each layer having at least three damper mounting slots. The dampers are installed in the damper mounting slots, and the force of the dampers acts on the outer wall of the damping tube. The damper includes a support ring, a spring sleeve, a damping ball, and a small spring; The support ring is installed in the damper mounting groove. The inside of the support ring has a space to accommodate the damping ball. A small opening is opened at the inner end of the support ring to expose the damping ball. The diameter of the small opening is smaller than the diameter of the damping ball. The outer end of the support ring is connected to a spring sleeve. The inner end of the small spring is connected to the damping ball, and the outer end of the small spring is connected to the spring sleeve. The damping ring is internally coated with alumina or zircon. The damping ball is coated with alumina or zircon. The nozzle adjustment mechanism includes an adjustment core, a pressure ring, a vulcanizing ring, and a nozzle sleeve; The upper end of the adjusting core is connected to the damping tube of the damping mechanism, and the upper end of the oil nozzle sleeve is connected to the damping sleeve of the damping mechanism; a radially penetrating adjusting hole is opened in the middle of the oil nozzle sleeve. The lower half of the outer wall of the adjusting core has at least three steps with a decreasing diameter from top to bottom, and a pressure ring and a vulcanizing ring are installed between the upper half of the outer wall of the adjusting core and the inner wall of the damping sleeve.

2. A small-diameter intelligent production line, comprising an external sand control line and an internal production line; wherein the sand control line is equipped with sand control packers between different oil layers, and the production line is equipped with production packers between different oil layers. characterized in that The production string is equipped with a small-diameter intelligent production device for different oil layers. The small-diameter intelligent production device includes a piston control mechanism, a spring position mechanism, a damping mechanism, and an oil nozzle adjustment mechanism connected in sequence from top to bottom. The upper end of the piston control mechanism is connected to the upper connector hydraulic control channel, the upper connector hydraulic control channel is connected to the hydraulic control pipeline, and the hydraulic control pipeline is connected upward to the electro-hydraulic circuit distribution device. The piston control mechanism includes a sealing sleeve, a cylindrical piston one, and a cylindrical piston two; The sealing sleeve has two axial cylindrical piston chambers, namely cylindrical piston chamber one and cylindrical piston chamber two. Cylindrical piston chamber one is installed in cylindrical piston chamber one, and cylindrical piston chamber two is installed in cylindrical piston chamber two. The lower ends of both cylindrical piston one and cylindrical piston two are connected to the central tube of the spring position mechanism. The upper end of the sealing sleeve is connected to the upper connector, the upper connector has an upper connector hydraulic control channel, and the upper end of the cylindrical piston cavity is connected to the upper connector hydraulic control channel. The spring positioning mechanism includes an outer sleeve, a central tube, and a large spring; The outer sleeve is fitted outside the central tube, with the upper end of the outer sleeve connected to the sealing sleeve of the piston control mechanism and the lower end of the outer sleeve connected to the damping sleeve of the damping mechanism. The large spring is placed inside the outer sleeve, with the upper end of the large spring pressing against the central tube through the upper adjusting shim, and the lower end of the large spring pressing against the damping sleeve through the lower adjusting shim. The damping mechanism is a multi-stage damping mechanism, which includes a damping tube, a damping sleeve, and a damper. The damping tube is located inside the damping sleeve. The upper end of the damping tube is connected to the central tube, and the lower end of the damping tube is connected to the adjusting core of the oil nozzle adjusting mechanism. The inner wall of the damping sleeve has at least two layers of damper mounting slots, each layer having at least three damper mounting slots. The dampers are installed in the damper mounting slots, and the force of the dampers acts on the outer wall of the damping tube. The damper includes a support ring, a spring sleeve, a damping ball, and a small spring; The support ring is installed in the damper mounting groove. The inside of the support ring has a space to accommodate the damping ball. A small opening is opened at the inner end of the support ring to expose the damping ball. The diameter of the small opening is smaller than the diameter of the damping ball. The outer end of the support ring is connected to a spring sleeve. The inner end of the small spring is connected to the damping ball, and the outer end of the small spring is connected to the spring sleeve. The damping ring is internally coated with alumina or zircon. The damping ball is coated with alumina or zircon. The nozzle adjustment mechanism includes an adjustment core, a pressure ring, a vulcanizing ring, and a nozzle sleeve; The upper end of the adjusting core is connected to the damping tube of the damping mechanism, and the upper end of the oil nozzle sleeve is connected to the damping sleeve of the damping mechanism; a radially penetrating adjusting hole is opened in the middle of the oil nozzle sleeve. The lower half of the outer wall of the adjusting core has at least three steps with a decreasing diameter from top to bottom, and a pressure ring and a vulcanizing ring are installed between the upper half of the outer wall of the adjusting core and the inner wall of the damping sleeve.

3. A method for constructing a small-diameter intelligent separate flow string, characterized in that, Using the small-diameter intelligent production line of claim 2, the method includes the following steps: pressurizing the small-diameter intelligent production device of one of the oil production layers through the hydraulic control line; the cylindrical piston pushes the central tube, the central tube drives the damping tube, the damping tube drives the adjusting core, and the flow orifice diameter generated by the adjusting core and the adjusting hole of the nozzle sleeve will change; when the flow rate reaches the required set flow rate, the hydraulic control line pressure is stopped, and the damping mechanism is locked at this time, realizing the adjustment of the opening of the downhole production device; when it is necessary to close the oil production layer, the hydraulic control line continues to pressurize; when the upper and lower sulfurized rings cover the injection port of the nozzle sleeve, the adjusting hole is completely blocked, realizing the closure of the oil production channel of the oil production layer.

4. The method according to claim 3, wherein, The regulating core adopts a multi-stage step design to achieve multiple throttling differential pressure control.

5. The method of claim 3, wherein, The electrical control switch of the ground control cabinet controls the electrical control fluid distribution device through the armored cable, opening the fluid control channel for controlling the small-diameter intelligent sub-production device of one of the oil production layers. Then, the fluid control switch of the ground control cabinet is connected to the electrical control fluid distribution device through the main fluid control pipeline. The electrical control fluid distribution device then pressurizes the small-diameter intelligent sub-production device of the current oil production layer through the branch fluid control pipeline.

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