Intelligent separate mining process pipe column and implementation method

Abstract

The invention belongs to the technical field of oil-gas field development, and discloses an intelligent separate mining process pipe column suitable for slim holes and an implementation method. The intelligent separate mining process pipe column comprises a sand control pipe column and a control pipe column, wherein the sand control pipe column comprises a sand control screen pipe located in an open hole section, a sand control top packer located at the front end of the sand control screen pipe and at least one open hole segmented sand control packer used for segmenting the open hole section to form a plurality of sub open hole sections; the bottom-hole regulator string at least comprises bottom-hole regulators located in all the sub open hole sections, electric control setting packers which are matched with the open hole segmented sand control packers in a setting mode and connected with the adjacent bottom-hole regulators, a lower intelligent node connected with the bottom-hole regulator at the foremost end and a releasing tool connected with the lower intelligent node; the production pipe column at least comprises an upper intelligent node and an electric submersible pump which are sequentially connected from bottom to top. The upper intelligent node is connected with the ground control device through a first steel pipe cable, the bottom-hole regulator is connected with the lower intelligent node through a second steel pipe cable, and the upper intelligent node penetrates through the releasing tool to be in magnetic coupling connection with the lower intelligent node.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field development, and in particular to an intelligent separation and production process string and an implementation method thereof. Background Art

[0002] my country's offshore oil fields have entered the stage of refined injection and production development. At present, offshore stratified production tubing strings mainly include drop-type production tubing strings and Y-type production tubing strings, and mechanical sand control methods are generally used. The production tubing strings use inserted sealing methods and sealing tubes inside the sand control tubing strings to achieve stratification, and the lifting systems all use electric submersible pumps.

[0003] Since conventional mechanical sleeves as layered production allocation tools have the disadvantages of low efficiency in switching and adjusting layers and unsuitability for highly deviated wells, the layered production allocation tools used in existing layered oil production strings are usually intelligent layered production tools that can be controlled on the ground. The hand-free production string usually adopts a cable-free intelligent production distributor, but the cable-free intelligent production distributor has limited battery energy and limited adjustment frequency. The pressure wave needs to be generated by pumping water from the casing. There are disadvantages such as low success rate of casing transmission pressure wave communication and risk of contaminating the reservoir. The Y-type production string usually adopts a cable-controlled intelligent production distributor or a hydraulic-controlled intelligent production distributor. This type of production distributor needs to use cables or hydraulic control pipelines as control signal transmission channels. The cables or hydraulic control pipelines are generally applied to the oil pipe. Although they have strong adaptability when used in 9-5 / 8in casing, if they are used in smaller casings, the space at the Y-joint position is limited, and there is a risk of squeezing the communication cable or hydraulic control pipeline. The risk of running is high, and the selection of electric submersible pumps will also be limited, especially in 7in casing. The selection of electric submersible pumps is greatly restricted and does not meet the production needs of liquid extraction.

[0004] Entering the middle and late stages of development, the number of side-drilling adjustment wells is increasing. "7in casing + 6in open hole" is the main completion method for side-drilling adjustment wells. Therefore, there is an urgent need for an intelligent production string suitable for small wells to make up for the above shortcomings of the existing technology. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention proposes an intelligent separation and production process string suitable for small wells and an implementation method.

[0006] According to the intelligent production process string of the present invention, it includes: a sand control string, which includes a sand control screen located in the open hole section, a sand control top packer located at the front end of the sand control screen, and at least one open hole segmented sand control packer for segmenting the open hole section to prevent sand to form multiple sub-open hole sections; a production string, which includes at least a production distributor located in each sub-open hole section, an electric control setting packer that cooperates with the open hole segmented sand control packer and is connected to the adjacent production distributor, a lower intelligent node connected to the front end of the production distributor, and a hand release tool connected to the front end of the lower intelligent node; and a production string, which includes at least an upper intelligent node and an electric submersible pump connected in sequence from bottom to top. Among them, the upper intelligent node is connected to the ground control device through a first steel pipe cable, the production distributor is connected to the lower intelligent node through a second steel pipe cable, and the upper intelligent node is connected to the lower intelligent node through the hand release tool through magnetic coupling.

[0007] Furthermore, the upper intelligent node includes a plug, in which a first energy coil and a first signal coil are sequentially arranged along the axial direction of the plug, and the lower intelligent node includes a lower connector formed with an inner cavity, in which a second energy coil and a second signal coil are sequentially arranged along the axial direction of the lower connector, and the plug is inserted into the inner cavity so that the first energy coil is opposite to the second energy coil to realize electric energy transfer, and at the same time, the first signal coil is opposite to the second signal coil to realize two-way signal communication.

[0008] Furthermore, the intelligent separation production process string also includes an in-place detection module, which includes a Hall element arranged in the plug and a magnetic material arranged in the lower joint, the Hall element is located between the first energy coil and the first signal coil, the magnetic material is located between the second energy coil and the second signal coil, the Hall element includes a first Hall element and a second Hall element arranged from top to bottom along the axis direction of the plug, the magnetic material includes a first magnetic ring and a second magnetic ring arranged from top to bottom along the axis direction of the lower joint, the first magnetic ring forms a first magnetic field area, and the second magnetic ring forms a second magnetic field area. When the second Hall element at least partially enters the second magnetic field area and the first Hall element at least partially enters the first magnetic field area, a docking in-place electrical signal is generated during the process of inserting the plug into the lower joint, and the docking in-place electrical signal is transmitted back to the ground control device through the first steel pipe cable connected to the upper intelligent node. .

[0009] Furthermore, the production tubing also includes a telescopic compensator connected between the upper intelligent node and the electric submersible pump, and the first steel pipe cable includes a first connecting section connected between the ground control device and the telescopic compensator and a second connecting section connected between the telescopic compensator and the upper intelligent node; wherein the telescopic compensator includes a telescopic rod connected to the electric submersible pump and a shell connected to the upper intelligent node, the shell having an opening and a sliding inner cavity connected to the opening, the telescopic rod includes a slider slidingly matched with the sliding inner cavity and a rod body connected to the slider, the outer diameter of the slider is larger than the outer diameter of the opening, a spiral steel armor is arranged between the slider and the opening, the spiral steel armor is sleeved on the rod body, the rod body is connected to the electric submersible pump, the first connecting section is connected to the rod body, and the second connecting section is connected to the shell.

[0010] Furthermore, the electrically controlled sealing device includes a main control circuit board, a micromotor connected to the main control circuit board, a screw connected to the micromotor, a rubber cylinder pressure ring connected to the screw, a sealing rubber cylinder connected to the rubber cylinder pressure ring, and a first cable connector connected to the main control circuit board, and the first cable connector is connected to the second steel pipe cable, wherein, when sealing is required, the ground control device sends a sealing command to the main control circuit board, and after receiving the sealing command, the main control circuit board controls the micromotor to rotate to drive the screw to rotate, thereby driving the rubber cylinder pressure ring to squeeze the sealing rubber cylinder to achieve sealing.

[0011] Furthermore, the distributor includes a control circuit board, a pressure detection module, a regulating valve actuator and a second cable connector. When the ground control device sends out a control instruction, it is parsed by the control circuit board to control the regulating valve actuator to perform an opening adjustment action. The pressure detection module is used to detect the pressure inside and outside the pipe and upload it to the ground control device. The ground control device gives the flow of each sub-naked hole section based on the built-in relationship chart of the pressure difference between the inside and outside of the pipe and the flow rate.

[0012] Furthermore, the production string also includes a positioning seal located at the front end of the sand control top packer, and a casing top packer located between the positioning seal and the lower intelligent node for hanging and straightening the production string, and the casing top packer is provided with a pressure transmission hole and a through hole for passing the second steel pipe cable.

[0013] Furthermore, the hand-releasing tool includes a well-retaining short section connected to the lower intelligent node and a hand-releasing short section connected to the well-retaining short section. The hand-releasing short section is connected to the upper intelligent node. Both the hand-releasing short section and the well-retaining short section are formed with a through hole for passing through the upper intelligent node. The end of the through hole on the well-retaining short section facing the upper intelligent node is formed in a trumpet shape.

[0014] According to the intelligent production process implementation method of the present invention, the above-mentioned intelligent production process string is applied, including the following steps: step one, lowering the sand control string; step two, lowering the production string with the upper oil pipe, and closing the production distributor after the positioning seal is lowered into place; step three, pressurizing to seal the casing top packer, and continuing to increase the pressure to disengage the drop-out short section from the well retention short section, and pulling out the upper oil pipe; step four, lowering the production string, so that the upper intelligent node and the lower intelligent node are docked in place; step five, the ground control device receives the docking signal and sends a sealing command to seal the electric-controlled sealing packer; step six, the ground control device adjusts the opening of the production distributor located in each sub-open hole section according to the reservoir demand.

[0015] Further, in step 2, before the upper tubing carrying the production string is lowered, the hand-releasing tool and the lower intelligent node are prefabricated as a tool assembly in advance, and the upper tubing is connected to the hand-releasing tool. After the positioning seal is lowered into place, a cable is used to carry the upper intelligent node for testing to enter the interior of the upper tubing and insert it into the lower intelligent node, so that the upper intelligent node for testing is magnetically coupled with the lower intelligent node, and then an operating instruction is issued through the ground control device to close the production device; or, in step 2, before the upper tubing carrying the production string is lowered, the upper intelligent node, the hand-releasing tool and the lower intelligent node are prefabricated as a tool assembly in advance, and the upper tubing is connected to the upper intelligent node. After the positioning seal is lowered into place, an operating instruction is issued through the ground control device to close the production device.

[0016] Compared with the prior art, the intelligent separation and production process column and implementation method of the present invention have the following advantages:

[0017] 1) It is possible to overhaul the electric submersible pump without moving the production pipe string, thereby effectively improving the pump inspection efficiency and reducing the operating cost.

[0018] 2) The hands-free non-contact electric-controlled intelligent production process string can avoid the space limitation of the Y-type string in the selection of electric submersible pumps in small-sized wellbores, meet the production needs of large-displacement liquid extraction, and realize intelligent measurement and control functions such as long-term power supply and online control monitoring.

[0019] 3) The upper production string and the lower distribution string are connected in a flexible and compensatory manner, thereby avoiding the impact on the electric submersible pump when the production string and the distribution string are connected.

[0020] 4) The use of the electrically controlled setting packer not only makes it easier to lower into the horizontal well section, thus solving the difficulty of lowering the conventional insert seal into the horizontal well section, but also has a higher rubber expansion ratio and sealing pressure difference. The rubber expansion ratio can reach 1.7 to 2, and the sealing pressure difference can reach 15MPa, thus making up for the deficiency of the conventional small-sized compression packer that has a poor setting effect due to the low sealing pressure difference.

[0021] 5) This process string is also suitable for 9-5 / 8in casing or larger wellbores, and still has the advantages of improving pump inspection efficiency and online monitoring and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of an intelligent separation and production process string according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 The upper intelligent node and the lower intelligent node are connected schematically;

[0024] Figure 3 for Figure 2 The structure and working principle diagram of the in-position detection module shown in the figure shows six different positions of the Hall element;

[0025] Figure 4 The in-place detection module sends a Figure 3 Schematic diagram of the electrical signals at six different locations shown;

[0026] Figure 5 for Figure 1 The structural schematic diagram of the telescopic compensator shown in FIG. 1 is in the extended state;

[0027] Figure 6 for Figure 1 The structural schematic diagram of the telescopic compensator shown in the retracted state;

[0028] Figure 7 for Figure 1 The internal structure diagram of the dispenser shown;

[0029] Figure 8 for Figure 1 The schematic diagram of the structure of the electric-controlled setting packer is shown;

[0030] Fig. 9 A schematic diagram of an implementation method of an intelligent separation process according to a first embodiment of the present invention;

[0031] Fig.10 Schematic diagram of an implementation method of an intelligent separation process according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] Figure 1 FIG. 1 shows the structure of an intelligent separation and production process column 100 according to an embodiment of the present invention. Figure 1As shown, the intelligent production process string 100 may include: a sand control string, which may include a sand control screen 18 located in an open hole section 25, a sand control top packer 16 located at the front end of the sand control screen 18, and at least one open hole segmented sand control packer 20 for segmenting the open hole section 25 to prevent sand to form multiple sub-open hole sections; a production string, which may include at least a production distributor 17 located in each sub-open hole section, an electrically controlled sealing packer 19 that cooperates with the open hole segmented sand control packer 20 and is connected to the adjacent production distributor 17 through the first oil pipe 24, a lower intelligent node 11 connected to the front-end production distributor 17 through the second oil pipe 14, and a release tool 10 connected to the front end of the lower intelligent node 11; and a production string, which may include at least an upper intelligent node 9 and an electric submersible pump 7 that are sequentially connected from bottom to top through a third oil pipe 5. Among them, the upper intelligent node 9 is connected to the ground control device 1 through the first steel pipe cable 21, the distributor 17 is connected to the lower intelligent node 11 through the second steel pipe cable 22, and the upper intelligent node 9 is magnetically coupled to the lower intelligent node 11 through the hand-dropping tool 10.

[0034] In the intelligent production process string 100 of the embodiment of the present invention, the upper intelligent node 9 and the lower intelligent node 11 are connected by magnetic coupling, which can realize the transmission of electric energy and communication signals on the one hand, thereby realizing the transmission of electric energy and signals between the ground control device 1 and the production distributor 17; on the other hand, when the electric submersible pump 7 needs to be repaired, it is only necessary to lift the production string to separate the upper intelligent node 9 from the lower intelligent node 11, so that the electric submersible pump 7 can be repaired without moving the production string, which effectively improves the pump inspection efficiency and reduces the operating cost. In addition, the detachable connection between the upper intelligent node 9 and the lower intelligent node 11 makes the string space where the electric submersible pump 7 is located larger. In a small-sized wellbore, the limitation of the Y-type string space on the selection of the electric submersible pump 7 is effectively avoided, thereby meeting the production demand of large-volume liquid extraction. In addition, the open hole segmented sand control packer 20 in the sand control string cooperates with the electrically controlled sealing packer 19 in the production string, and a sealing instruction is sent to the electrically controlled sealing packer 19 through the ground control device 1, so that the electrically controlled sealing packer 19 can be sealed in the open hole segmented sand control packer 20. The sealing cooperation between the two realizes the segmented isolation and production of horizontal open hole sections on the one hand, and the electrically controlled sealing packer 19 is easier to lower into the horizontal section, thereby solving the difficulty of lowering conventional inserted seals into the horizontal section. On the other hand, the rubber tube expansion ratio of the electrically controlled sealing packer 19 in the open hole segmented sand control packer 20 is higher, and the sealing pressure difference is larger, thereby making up for the deficiency of poor sealing effect of conventional small-sized compression packers due to low sealing pressure difference.

[0035] In a preferred embodiment, the open hole segmented sand control packer 20 can be used in the development of new wells, and a chemical packer can be used instead in old wells that have been put into production.

[0036] According to the present invention, in Figure 2 In the preferred embodiment shown, the upper intelligent node 9 may include a plug 91, in which a first energy coil 92 and a first signal coil 93 are sequentially arranged along the axial direction thereof, and the lower intelligent node 11 may include a lower joint formed with an inner cavity 111, in which a second energy coil 112 and a second signal coil 113 are sequentially arranged along the axial direction of the lower joint, and the plug 91 is inserted into the inner cavity 111 so that the first energy coil 92 and the second energy coil 112 are opposite to each other to realize electric energy transmission, and at the same time, the first signal coil 93 and the second signal coil 113 are opposite to each other to realize two-way signal communication. In this embodiment, by arranging energy coils and signal coils inside both the upper intelligent node 9 and the lower intelligent node 11, the upper intelligent node 9 and the lower intelligent node 11 realize the transmission of electric energy and communication signals through the principle of magnetic coupling resonance, thereby realizing the transmission of electric energy and signals between the ground control device 1 and the distributor 17.

[0037] Furthermore, if Figure 2 As shown, the intelligent separation process string may also include an in-place detection module, which may include a Hall element 94 disposed in the plug 91 and a magnetic material 114 disposed in the lower joint, the Hall element 94 is located between the first energy coil 92 and the first signal coil 93, and the magnetic material 114 is located between the second energy coil 112 and the second signal coil 113. Figure 3 As shown, the Hall element 94 may include a first Hall element 941 and a second Hall element 942 spaced from top to bottom along the axis direction of the plug 91, and the magnetic material 114 may include a first magnetic ring 1141 and a second magnetic ring 1142 spaced from top to bottom along the axis direction of the lower joint, the first magnetic ring 1141 forms a first magnetic field region 101, and the second magnetic ring 1142 forms a second magnetic field region 102. When the plug 91 is inserted into the lower joint, when the second Hall element 942 at least partially enters the second magnetic field region 102 and the first Hall element 941 at least partially enters the first magnetic field region 101, a docking in place electrical signal is generated, and the docking in place electrical signal is transmitted back to the surface control device 1 through the first steel pipe cable 21 connected to the upper intelligent node 9. The first Hall element 941 and the second Hall element 942 and the first magnetic ring 1141 and the second magnetic ring 1142 provided in this embodiment can realize the interval detection of docking in place, can effectively control the speed of the pipe string running, and avoid the impact force during docking from causing damage to the electric submersible pump 7, the upper intelligent node 9 and the lower intelligent node 11.

[0038] Combination Figure 3 and Figure 4 As shown, Figure 3 The six different positions of the Hall element are shown. Figure 4 The in-place detection module sends a Figure 3 The electrical signals at six different positions are shown in the figure, where the solid line represents the electrical signal emitted by the first Hall element 941, and the dotted line represents the electrical signal emitted by the second Hall element 942; the working process of the in-place detection module is as follows: when the production string is gradually lowered, the upper intelligent node 9 is gradually inserted into the lower intelligent node 11, and when the upper intelligent node 9 is in position ①, neither the first Hall element 941 nor the second Hall element 942 detects the magnetic field, and the electrical signals transmitted back to the ground control device 1 are 0; the string is continued to be lowered, and when the upper intelligent node 9 is in position ②, the second Hall element 942 detects that the magnetic field strength of the first magnetic ring 1141 is greater than a certain set threshold, and the electrical signal value is 1, which is transmitted back to the ground control device 1; when the upper intelligent node 9 moves from position ② to position ③, the electrical signal transmitted back by the second Hall element 942 remains 1, and the first Hall element 941 remains 0; when the upper intelligent node 9 moves from position ③ When the upper intelligent node 9 is at position ④, the electric signal transmitted back by the second Hall element 942 becomes 0, and the first Hall element 941 remains 0; when the upper intelligent node 9 is at position ④, the first Hall element 941 detects that the magnetic field strength of the first magnetic ring 1141 is greater than a certain set threshold, and the electric signal value is 1, which is transmitted back to the ground control device 1; when the upper intelligent node 9 is from position ④ to position ⑤, the electric signal transmitted back by the second Hall element 942 remains 0, and the first Hall element 941 remains 1; when the upper intelligent node 9 is from position ⑤ to position ⑥, the electric signals transmitted back by the first Hall element 941 and the second Hall element 942 are both 1, at this time, the second Hall element 942 at least partially enters the second magnetic field area 102 and the first Hall element 941 at least partially enters the first magnetic field area 101, and this range is the docking interval, which can realize effective power supply and communication between the upper intelligent node 9 and the lower intelligent node 11. Preferably, the distance of the docking interval can be 500mm.

[0039] According to the present invention, in Figure 1 In the preferred embodiment shown, the production string may further include a telescopic compensator 8 connected between the upper intelligent node 9 and the electric submersible pump 7, and the first steel pipe cable 21 includes a first connection section connected between the surface control device 1 and the telescopic compensator 8 and a second connection section connected between the telescopic compensator 8 and the upper intelligent node 9. Figure 5As shown, the telescopic compensator 8 may include a telescopic rod 84 connected to the electric submersible pump 7 and a shell 81 connected to the upper intelligent node 9, the shell 81 has an opening 83 and a sliding inner cavity 82 connected to the opening 83, the telescopic rod 84 may include a slider 85 slidably matched with the sliding inner cavity 82 and a rod body connected to the slider 85, the outer diameter of the slider 85 is larger than the outer diameter of the opening 83, a spiral steel armor 86 is arranged between the slider 85 and the opening 83, the spiral steel armor 86 is sleeved on the rod body, the rod body is connected to the electric submersible pump 7, the first connecting section is connected to the rod body through the second cable connector 88, and the second connecting section is connected to the shell 81 through the third cable connector 87.

[0040] This embodiment installs a telescopic compensator 8 between the submersible pump 7 and the upper intelligent node 9. The telescopic compensator 8 can not only achieve compensation for the first steel pipe cable 21, thereby preventing the first steel pipe cable 21 from being broken due to the creep of the oil pipe during the production process, thereby improving the use stability of the production system and the service life of the downhole tools; it can also achieve oil pipe compensation for the production string, thereby facilitating flexible docking when the upper intelligent node 9 and the lower intelligent node 11 are docked, thereby avoiding impact on the submersible pump 7.

[0041] like Figure 5 As shown, the telescopic compensator 8 is in an extended state, and the spiral steel armor 86 in the telescopic compensator 8 can meet the axial stretching of the first steel pipe cable 21 when the oil pipe creeps, thereby increasing the service life of the cable in the well. Figure 6 As shown, the telescopic compensator 8 is in a retracted state. The telescopic compensator 8 can preferably be configured to meet the distance adjustment of 500mm to 1000mm, or multiple sets of tools can be connected in series to achieve a larger distance adjustment.

[0042] According to the present invention, in Figure 8 In the preferred embodiment shown, the electric control setting packer 19 may include a main control circuit board 191, a micro motor 192 connected to the main control circuit board 191, a screw 193 connected to the micro motor 192, a rubber cylinder pressure ring 194 connected to the screw 193, a setting rubber cylinder 195 connected to the rubber cylinder pressure ring 194, and a first cable connector 196 connected to the main control circuit board 191, and the first cable connector 196 is connected to the second steel pipe cable 22. When setting is required, the ground control device 1 sends a setting command to the main control circuit board 191, and the main control circuit board 191 controls the micro motor 192 to rotate after receiving the setting command to drive the screw 193 to rotate, thereby driving the rubber cylinder pressure ring 194 to squeeze the setting rubber cylinder 195 to achieve setting.

[0043] Specifically, the sealing command sent by the ground control device 1 is transmitted to the upper intelligent node 9 through the first steel pipe cable 21, and the upper intelligent node 9 is transmitted to the second signal coil 113 of the lower intelligent node 11 through the first signal coil 93, and then transmitted to the main control circuit board 191 of the electrically controlled sealing packer 19 through the second steel pipe cable 22 connected to the lower intelligent node 11; the first cable connector 4a is used to power the electrically controlled sealing packer 19, and the electric energy is transmitted to the upper intelligent node 9 through the first steel pipe cable 21, and the upper intelligent node 9 is transmitted to the second energy coil 112 of the lower intelligent node 11 through the first energy coil 92, and then transmitted to the first cable connector 4a through the second steel pipe cable 22 connected to the lower intelligent node 11, thereby realizing power supply to the electrically controlled sealing packer 19.

[0044] According to the present invention, in Figure 7 In the preferred embodiment shown, the distributor 17 may include a control circuit board 172, a pressure detection module 174, a regulating valve actuator 173 and a cable connector 171. The cable connector 171 on the left is connected to the second steel pipe cable 22, and the cable connector 171 on the right is connected to the next distributor 17. After the ground control device 1 issues a control instruction, it is parsed through the control circuit board 172 to control the regulating valve actuator 173 to perform an opening adjustment action. Preferably, the opening adjustment of the distributor 17 of no less than 7 layers in a single well is completed to achieve water plugging, oil stabilization and water control functions in each oil layer. The pressure detection module 174 is used to detect the pressure inside and outside the pipe and upload it to the ground control device 1. The ground control device 1 can give the flow rate of each sub-open hole section according to the built-in relationship chart of the pressure difference between the inside and outside of the pipe and the flow rate, so as to achieve the purpose of oil stabilization and water control.

[0045] According to the present invention, in Figure 1 In the preferred embodiment shown, the production string may also include a positioning seal 15 located at the front end of the sand control top packer 16, and a casing top packer 13 located between the positioning seal 15 and the lower intelligent node 11 for hanging and straightening the production string, and the casing top packer 13 is provided with a pressure transmission hole and a through hole for passing the second steel pipe cable 22. The arrangement of the casing top packer 13 in this embodiment facilitates the sedimentation of formation sand on its upper surface, or the sedimentation of solid scale blocks produced by the reaction between the upper pipe string and the fluid on its upper surface; the arrangement of the pressure transmission hole is used to prevent the closed space between the casing top packer 13 and the positioning seal 15 from causing the closed pressure to rise due to the production fluid output, thereby affecting the safe setting of the casing top packer 13.

[0046] According to the present invention, in Fig. 9 and Fig.10In the preferred embodiment shown, the hand-releasing tool 10 may include a well-retaining short section 104 connected to the lower intelligent node 11 and a hand-releasing short section 103 connected to the well-retaining short section 104, the hand-releasing short section 103 is connected to the upper intelligent node 9, and both the hand-releasing short section 103 and the well-retaining short section 104 are formed with through holes for passing through the upper intelligent node 9, and the end of the through hole on the well-retaining short section 104 facing the upper intelligent node 9 is formed in a trumpet shape to facilitate the subsequent insertion and docking of the upper intelligent node 9.

[0047] According to the intelligent separation production process implementation method of the embodiment of the present invention, the above-mentioned intelligent separation production process column 100 is applied, combined with Figure 1 , Fig. 9 as well as Fig.10 As shown, the following steps may be included: step one, lowering the sand control string; step two, lowering the production string with the upper tubing 12, closing the production distributor 17 after the positioning seal 15 is lowered into place; step three, pressurizing to seal the casing top packer 13, continuing to increase the pressure to disengage the hand-release short section 103 from the well retention short section 104, and pulling out the upper tubing 12; step four, lowering the production string, so that the upper intelligent node 9 and the lower intelligent node 11 are docked in place; step five, the ground control device 1 receives the docking signal and sends a sealing command to seal the electric-controlled sealing packer 19; step six, the ground control device 1 adjusts the opening of the production distributor 17 located in each sub-open hole section according to the reservoir demand.

[0048] Preferably, step 2 may include two implementation modes. Fig. 9 In the preferred embodiment shown, in step 2, before the upper tubing 12 is lowered with the production distribution string, the release tool 10 (including the release short section 103 and the well retention short section 104) and the lower intelligent node 11 can be prefabricated as a tool assembly in advance, and the upper tubing 12 is connected to the release short section 103 of the release tool 10. After the positioning seal 15 is lowered into place, the upper intelligent node 26 for testing is carried by the cable 27 into the interior of the upper tubing 12 and inserted into the lower intelligent node 11, so that the upper intelligent node 26 for testing is magnetically coupled with the lower intelligent node 12, and then the operation command is issued through the ground control device 1 to close the production distribution device 17. Since the signal of the production distribution device 17 cannot be tested after the lower intelligent node 11 is lowered, when the production distribution string is lowered into place, the upper intelligent node 26 can be used to test whether the communication of the production distribution device is normal. This embodiment can test whether the signal of the production distribution device 17 is communicating normally in stages.

[0049] In such Fig.10In the preferred embodiment shown, in step 2, before the upper tubing 12 carrying the production string is lowered, the upper intelligent node 9, the hand-dropping tool 10 and the lower intelligent node 11 can be prefabricated as a tool assembly in advance, and the upper tubing 12 is connected to the upper intelligent node 9. After the positioning seal 15 is lowered into place, an operation command is issued through the ground control device 1 to close the production device 17. This embodiment can realize staged testing of whether the signal of the production device 17 is normal during the whole process of lowering the production string.

[0050] According to the intelligent production process implementation method of the embodiment of the present invention, when the electric submersible pump 7 needs to be inspected, the production string is lifted, the upper intelligent node 9 is separated from the lower intelligent node 11, and the production string is pulled out. After the pump is inspected, the production string is connected according to the original string and lowered into the well, the upper intelligent node 9 and the lower intelligent node 11 are docked again, and the ground control device 1 can re-control and adjust the production distributor 17, which has the advantages of short construction period, high efficiency, low cost, etc.

[0051] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0052] In the description of the present application, it should be understood that the terms "front end", "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An intelligent separation and production process column, characterized in that: include: A sand control string, the sand control string comprising a sand control screen located in an open hole section, a sand control top packer located at a front end of the sand control screen, and at least one open hole segmented sand control packer for segmenting the open hole section to form a plurality of sub-open hole sections; A production distribution string, the production distribution string at least includes a production distribution device located in each of the sub-open hole sections, an electric-controlled setting packer that cooperates with the open hole segmented sand control packer and is connected to the adjacent production distribution device, a lower intelligent node connected to the front-end production distribution device, and a release tool connected to the front end of the lower intelligent node; as well as A production string, the production string comprising at least an upper intelligent node and an electric submersible pump connected in sequence from bottom to top; Among them, the upper intelligent node is connected to the ground control device through a first steel pipe cable, the production distributor is connected to the lower intelligent node through a second steel pipe cable, and the upper intelligent node is magnetically coupled to the lower intelligent node through the hand-dropping tool.

2. The intelligent separation and production process column according to claim 1 is characterized in that: The upper intelligent node includes a plug, in which a first energy coil and a first signal coil are sequentially arranged along the axial direction of the plug; the lower intelligent node includes a lower connector formed with an inner cavity, in which a second energy coil and a second signal coil are sequentially arranged along the axial direction of the lower connector; the plug is inserted into the inner cavity so that the first energy coil is opposite to the second energy coil to realize electric energy transfer, and at the same time, the first signal coil is opposite to the second signal coil to realize two-way signal communication.

3. The intelligent separation and production process column according to claim 2 is characterized in that: The intelligent production process string also includes an in-place detection module, which includes a Hall element arranged in the plug and a magnetic material arranged in the lower joint, the Hall element is located between the first energy coil and the first signal coil, and the magnetic material is located between the second energy coil and the second signal coil. The Hall element includes a first Hall element and a second Hall element spaced from top to bottom along the axial direction of the plug, and the magnetic material includes a first magnetic ring and a second magnetic ring spaced from top to bottom along the axial direction of the lower joint, the first magnetic ring forms a first magnetic field area, and the second magnetic ring forms a second magnetic field area. During the process of inserting the plug into the lower joint, when the second Hall element at least partially enters the second magnetic field area and the first Hall element at least partially enters the first magnetic field area, a docking in-place electrical signal is generated, and the docking in-place electrical signal is transmitted back to the ground control device through the first steel pipe cable connected to the upper intelligent node.

4. The intelligent separation and production process column according to any one of claims 1 to 3, characterized in that: The production tubing string also includes a telescopic compensator connected between the upper intelligent node and the electric submersible pump, and the first steel pipe cable includes a first connecting section connected between the ground control device and the telescopic compensator and a second connecting section connected between the telescopic compensator and the upper intelligent node, wherein the telescopic compensator includes a telescopic rod connected to the electric submersible pump and a shell connected to the upper intelligent node, the shell having an opening and a sliding inner cavity connected to the opening, the telescopic rod includes a slider slidingly matched with the sliding inner cavity and a rod body connected to the slider, the outer diameter of the slider is larger than the outer diameter of the opening, a spiral steel armor is arranged between the slider and the opening, the spiral steel armor is sleeved on the rod body, the rod body is connected to the electric submersible pump, the first connecting section is connected to the rod body, and the second connecting section is connected to the shell.

5. The intelligent separation and production process string according to any one of claims 1 to 3, characterized in that: The electrically controlled sealing packer includes a main control circuit board, a micromotor connected to the main control circuit board, a screw connected to the micromotor, a rubber cylinder pressure ring connected to the screw, a sealing rubber cylinder connected to the rubber cylinder pressure ring, and a first cable connector connected to the main control circuit board, wherein the first cable connector is connected to the second steel pipe cable, wherein when sealing is required, the ground control device sends a sealing command to the main control circuit board, and after receiving the sealing command, the main control circuit board controls the micromotor to rotate to drive the screw to rotate, thereby driving the rubber cylinder pressure ring to squeeze the sealing rubber cylinder to achieve sealing.

6. The intelligent separation and production process column according to any one of claims 1 to 3, characterized in that: The distributor includes a control circuit board, a pressure detection module, a regulating valve actuator and a second cable connector. When the ground control device sends out a control instruction, it is parsed by the control circuit board to control the regulating valve actuator to adjust the opening. The pressure detection module is used to detect the pressure inside and outside the pipe and upload it to the ground control device. The ground control device gives the flow of each sub-naked hole section based on the built-in relationship chart of the pressure difference between the inside and outside of the pipe and the flow rate.

7. The intelligent separation and production process column according to any one of claims 1 to 3, characterized in that: The production string also includes a positioning seal located at the front end of the sand control top packer, and a casing top packer located between the positioning seal and the lower intelligent node for suspending and straightening the production string, and the casing top packer is provided with a pressure transmission hole and a through hole for passing the second steel pipe cable.

8. The intelligent separation and production process column according to any one of claims 1 to 3, characterized in that: The hand-releasing tool includes a well-retaining short section connected to the lower intelligent node and a hand-releasing short section connected to the well-retaining short section, the hand-releasing short section is connected to the upper intelligent node, and both the hand-releasing short section and the well-retaining short section are formed with a through hole for passing through the upper intelligent node, and the end of the through hole on the well-retaining short section facing the upper intelligent node is formed in a trumpet shape.

9. A method for implementing an intelligent separation production process, using the intelligent separation production process column according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, lowering the sand control column; Step 2: lowering the production distribution string through the upper oil pipe, closing the production distribution device after the positioning seal is lowered into place; Step 3, pressurizing to set the casing top packer, and continuing to pressurize to disengage the drop-out short section from the well retention short section, and pulling out the upper tubing; Step 4, lowering the production string so that the upper smart node and the lower smart node are docked in place; Step 5, the ground control device receives the docking completion signal and sends a setting instruction to set the electric-controlled setting packer; Step six, the surface control device adjusts the opening of the production distributor located in each sub-open hole section according to reservoir demand.

10. The intelligent separation and mining process construction method according to claim 9 is characterized in that: In the step 2, before the upper tubing carrying the production distribution string is lowered, the hand-releasing tool and the lower intelligent node are prefabricated as a tool assembly in advance, and the upper tubing is connected to the hand-releasing tool. After the positioning seal is lowered into place, a cable is used to carry the upper intelligent node for testing to enter the interior of the upper tubing and insert it into the lower intelligent node, so that the upper intelligent node for testing is magnetically coupled with the lower intelligent node, and then an operation instruction is issued through the ground control device to close the production distribution device; or, in the step 2, before the upper tubing carrying the production distribution string is lowered, the upper intelligent node, the hand-releasing tool and the lower intelligent node are prefabricated as a tool assembly in advance, and the upper tubing is connected to the upper intelligent node. After the positioning seal is lowered into place, an operation instruction is issued through the ground control device to close the production distribution device.

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