Flow testing system used in shaft

Abstract

The utility model discloses a flow testing system used in a shaft, which comprises a flow instrument, one end part of the flow instrument is connected with a centralizer, one end of the centralizer far away from the flow instrument is connected with a control module through a cable, and the cable is wound on a winch; the centralizer comprises a rubber plug and a rope socket head which are arranged at the two ends respectively, the rubber plug is connected with the flow instrument, a fixing ring is arranged between the rubber plug and the rope socket head, and a plurality of wedge-shaped centralizing blocks are arranged on the fixing ring. The flow testing system used in the shaft is small in outer diameter and short in length, can pass through a narrow section in the shaft, effectively prevents an instrument from being blocked in the lowering process, optimizes the righting design, can effectively reduce friction and abrasion of a plate spring piece in the lowering process of the instrument, prevents the instrument from blocking a well, and improves the allocation success rate.

Description

Technical Field

[0001] The utility model belongs to the technical field of downhole flow rate testing equipment and relates to a flow rate testing system used in a wellbore. Background Art

[0002] During oilfield exploitation, affected by factors such as well water quality and high mineralization, scale, formation impurities and other attachments, such as dead oil, are easily formed on the inner wall of the wellbore, resulting in a reduction in the inner diameter of the wellbore and a deteriorating environment inside the wellbore. Due to the limitation of the outer diameter of the instrument, many existing measuring instruments have little remaining space when passing through the narrowest part of the inner wall of the wellbore. Once the inner diameter of the wellbore becomes smaller, these instruments are difficult to lower into the wellbore, unable to reach the target position, and difficult to achieve the test objectives; although there are some flow meters with smaller outer shell diameters on the market, they are usually straightened with leaf spring stabilizers, but the leaf spring stabilizers are often worn and broken due to friction with the inside of the wellbore during the instrument lowering process, causing the instrument to get stuck in the well, and also have a negative impact on the well condition, resulting in subsequent test instruments being blocked.

[0003] In summary, the prior art has the problem that the inner diameter of the wellbore is small, which makes it inconvenient to test the internal flow rate. Utility Model Content

[0004] The utility model aims to provide a flow rate testing system for a wellbore, which solves the problem in the prior art that the wellbore inner diameter is small, leading to inconvenience in the internal flow rate testing.

[0005] The technical scheme adopted by the utility model is a flow test system in a wellbore, comprising a flow meter, one end of the flow meter is connected to a centralizer, the end of the centralizer away from the flow meter is connected to a control module through a cable, and the cable is wound on a winch; the centralizer comprises a rubber plug and a rope cap head respectively arranged at both ends, the rubber plug is connected to the flow meter, a fixing ring is arranged between the rubber plug and the rope cap head, and a plurality of wedge-shaped centralizing blocks are arranged on the fixing ring.

[0006] The utility model is also characterized in that:

[0007] The flow meter comprises a shell with a column structure, one end of the shell is axially fixed with an instrument upper joint, the instrument upper joint is connected with a rubber plug, and a limit key is fixed on the outer wall of the other end of the shell.

[0008] An adjusting arm is arranged on one side of the limit key away from the end of the shell, and the adjusting arm is hinged on the outer wall of the shell.

[0009] A pressure-bearing outer casing is arranged at one end of the regulating arm away from the limit key, the outer wall of the pressure-bearing outer casing is closely fitted with the inner wall of the shell, and the pressure-bearing outer casing is embedded in the shell; a motor is embedded in the pressure-bearing outer casing.

[0010] A first protective tube is arranged at one end of the pressure-bearing outer protective tube away from the adjusting arm, the outer wall of the first protective tube is closely fitted with the inner wall of the shell, the first protective tube is embedded in the shell, and a magnetic positioning sensor is arranged in the first protective tube.

[0011] The first protective tube is provided with a first card slot and a second card slot in sequence at one end away from the pressure-bearing outer protective tube. The first card slot and the second card slot are fixedly connected to the inner wall of the shell, and a circuit board is embedded between the first card slot and the second card slot.

[0012] A circuit board guard is arranged between the first card slot and the second card slot. The circuit board guard is fitted with the inner wall of the shell. The circuit board guard is jacketed on the circuit board. An insulating layer is arranged between the circuit board and the circuit board guard.

[0013] A temperature sensor and a pressure sensor are arranged between the second card slot and the upper joint of the instrument, and the temperature sensor and the pressure sensor are embedded in the shell.

[0014] The beneficial effects of the utility model are as follows: the utility model has a small outer diameter and a short length, can pass through the narrow section in the wellbore, effectively avoids the instrument encountering obstruction during the lowering process, and the optimized righting design can effectively reduce the friction and wear of the leaf spring during the lowering process of the instrument, avoids the instrument from getting stuck in the well, and improves the deployment success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a flow meter in a flow test system in a wellbore according to the utility model;

[0016] Figure 2 The utility model is a structural schematic diagram of a centralizer in a flow rate testing system in a wellbore.

[0017] In the figure, 1. flow meter; 101. housing; 102. limit key; 103. motor; 104. pressure outer casing; 105. magnetic positioning sensor; 106. first protective casing; 107. first card slot; 108. circuit board; 109. second card slot; 110. insulation layer; 111. circuit board guard plate; 112. temperature sensor; 113. pressure sensor; 114. instrument upper connector; 115. adjustment arm; 2. centralizer; 201. rubber plug; 202. wedge-shaped centralizer block; 203. fixing ring; 204. rope cap head; DETAILED DESCRIPTION

[0018] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0019] Used in flow testing systems in wellbore, such as Figure 1 and Figure 2As shown, it includes a flow meter 1, one end of the flow meter 1 is connected to a centralizer 2, and the end of the centralizer 2 away from the flow meter 1 is connected to a control module through a cable, and the cable is wound on a winch; the centralizer 2 includes a rubber plug 201 and a rope cap head 204 respectively arranged at both ends, the rubber plug 201 is connected to the flow meter 1, a fixing ring 203 is arranged between the rubber plug 201 and the rope cap head 204, and a plurality of wedge-shaped centralizing blocks 202 are arranged on the fixing ring 203.

[0020] The flow meter 1 includes a shell 101 of a column-shaped structure, an instrument upper joint 114 is fixedly connected to one end of the shell 101 along the axial direction, and the instrument upper joint 114 is connected to the rubber plug 201. A limit key 102 is fixedly connected to the outer wall of the other end of the shell 101. An adjustment arm 115 is provided on the side of the limit key 102 away from the end of the shell 101, and the adjustment arm 115 is hinged on the outer wall of the shell 101. A pressure-bearing outer casing 104 is provided on the end of the adjustment arm 115 away from the limit key 102, and the outer wall of the pressure-bearing outer casing 104 is tightly fitted with the inner wall of the shell 101, and the pressure-bearing outer casing 104 is embedded in the shell 101; a motor 103 is embedded in the pressure-bearing outer casing 104.

[0021] The end of the pressure-bearing outer casing 104 away from the adjustment arm 115 is provided with a first protective tube 106, the outer wall of the first protective tube 106 is closely fitted with the inner wall of the shell 101, the first protective tube 106 is embedded in the shell 101, and the magnetic positioning sensor 105 is arranged in the first protective tube 106. The end of the first protective tube 106 away from the pressure-bearing outer casing 104 is provided with a first card slot 107 and a second card slot 109 in sequence, the first card slot 107 and the second card slot 109 are fixed to the inner wall of the shell 101, and a circuit board 108 is embedded between the first card slot 107 and the second card slot 109. A circuit board guard plate 111 is provided between the first card slot 107 and the second card slot 109, the circuit board guard plate 111 is fitted with the inner wall of the shell 101, the circuit board guard plate 111 is covered on the circuit board 108, and an insulating layer 110 is provided between the circuit board 108 and the circuit board guard plate 111. A temperature sensor 112 and a pressure sensor 113 are disposed between the second card slot 109 and the upper connector 114 of the instrument. The temperature sensor 112 and the pressure sensor 113 are embedded in the housing 101 .

[0022] The utility model directly installs the motor 103 in the pressure-bearing outer casing 104, and reduces the outer diameter of the flow meter 1 without changing the function and performance of the flow meter 1; the two ends of the circuit board 108 are respectively embedded in the first card slot 107 and the second card slot 109, and the circuit board 108 is fixed and protected by the circuit board guard plate 111, thereby reducing the outer diameter of the flow meter 1 and shortening the length of the flow meter 1; by improving the structure of the housing 101, reducing the diameter and inner diameter of the flow meter 1, further reducing the overall size of the flow meter 1, and improving the passability of the flow meter 1 in the wellbore; the ordinary thin-walled plate spring straightening structure is The leaf spring is easily worn off and causes well jamming, thus causing the instrument to encounter obstacles when going down the well. The centralizer 2 in the utility model is wear-resistant and does not break, so well jamming can be avoided. The rubber plug 201 in the utility model is used to connect the centralizer 2 and the flow meter 1 to provide voltage and exchange information. The wedge-shaped centralizing block 202 keeps the flow meter 1 centered in the wellbore. The fixing ring 203 is used to fix the wedge-shaped centralizing block 202. The rope cap head 204 is used as a limiting part to provide tension and tensile strength for the downhole instrument. After the steel wire breaks or slips off, the rope cap head can be grabbed by a salvage tool to salvage the instrument out of the wellbore.

[0023] The working principle of the utility model is as follows: the centralizer 2 is fixed to the flow meter 1, the flow meter 1 is connected to the control module through the centralizer 2 and the cable, the cable is wound on the drum of the winch, and the flow meter 1 is lowered into the wellbore by the winch. After being placed into the wellbore, the flow meter 1 moves downward due to its own gravity, and the cable gives the flow meter 1 an upward pulling force to control the lowering speed. The winch will display the depth and tension of the flow meter 1, so as to know the position of the flow meter 1 in the well, and the flow meter 1 needs to be lowered to about 10 meters above the target layer; after the flow meter 1 reaches the specified position, the control module opens the adjustment arm 115, and the adjustment arm 115 is docked with the water distributor. After the docking is completed, the water distributor is adjusted by the control module. After the adjustment is completed, the adjustment arm 115 is controlled to be separated from the water distributor. After the separation is completed, the flow meter 1 is lifted up by the winch, and the instrument is taken out of the wellbore to complete the operation.

[0024] Example 1

[0025] like Figure 1 and Figure 2 As shown, this embodiment proposes a flow rate testing system for a wellbore, including a flow meter 1, one end of the flow meter 1 is connected to a centralizer 2, the end of the centralizer 2 away from the flow meter 1 is connected to a control module through a cable, and the cable is wound on a winch; the centralizer 2 includes a rubber plug 201 and a rope cap head 204 respectively arranged at both ends, the rubber plug 201 is connected to the flow meter 1, a fixing ring 203 is arranged between the rubber plug 201 and the rope cap head 204, and four wedge-shaped centralizing blocks 202 are arranged on the fixing ring 203.

[0026] Example 2

[0027] like Figure 1 and Figure 2 As shown, this embodiment proposes a flow test system for a wellbore, including a flow meter 1, one end of the flow meter 1 is connected to a centralizer 2, and the end of the centralizer 2 away from the flow meter 1 is connected to a control module through a cable, and the cable is wound on a winch; the centralizer 2 includes a rubber plug 201 and a rope cap head 204 respectively arranged at both ends, the rubber plug 201 is connected to the flow meter 1, a fixing ring 203 is arranged between the rubber plug 201 and the rope cap head 204, and three wedge-shaped centralizing blocks 202 are arranged on the fixing ring 203. The flow meter 1 includes a shell 101 with a column structure, one end of the shell 101 is fixedly connected to an instrument upper joint 114 along the axial direction, and the instrument upper joint 114 is connected to the rubber plug 201, and a limit key 102 is fixedly connected to the outer wall of the other end of the shell 101. The limit key 102 is provided with an adjustment arm 115 on the side away from the end of the shell 101, and the adjustment arm 115 is hinged on the outer wall of the shell 101.

[0028] Example 3

[0029] like Figure 1 and Figure 2 As shown, this embodiment proposes a flow rate testing system for a wellbore, including a flow meter 1, one end of the flow meter 1 is connected to a centralizer 2, the end of the centralizer 2 away from the flow meter 1 is connected to a control module through a cable, and the cable is wound on a winch; the centralizer 2 includes a rubber plug 201 and a rope cap head 204 respectively arranged at both ends, the rubber plug 201 is connected to the flow meter 1, a fixing ring 203 is arranged between the rubber plug 201 and the rope cap head 204, and six wedge-shaped centralizing blocks 202 are arranged on the fixing ring 203.

[0030] The flow meter 1 includes a shell 101 of a column-shaped structure, an instrument upper joint 114 is fixedly connected to one end of the shell 101 along the axial direction, and the instrument upper joint 114 is connected to the rubber plug 201. A limit key 102 is fixedly connected to the outer wall of the other end of the shell 101. An adjustment arm 115 is provided on the side of the limit key 102 away from the end of the shell 101, and the adjustment arm 115 is hinged on the outer wall of the shell 101. A pressure-bearing outer casing 104 is provided on the end of the adjustment arm 115 away from the limit key 102, and the outer wall of the pressure-bearing outer casing 104 is tightly fitted with the inner wall of the shell 101, and the pressure-bearing outer casing 104 is embedded in the shell 101; a motor 103 is embedded in the pressure-bearing outer casing 104. A first protective tube 106 is provided at one end of the pressure-bearing outer protective tube 104 away from the adjustment arm 115 . The outer wall of the first protective tube 106 is tightly fitted with the inner wall of the shell 101 . The first protective tube 106 is embedded in the shell 101 . A magnetic positioning sensor 105 is provided in the first protective tube 106 .

[0031] Example 4

[0032] like Figure 1 and Figure 2 As shown, this embodiment proposes a flow rate testing system for a wellbore, including a flow meter 1, one end of the flow meter 1 is connected to a centralizer 2, the end of the centralizer 2 away from the flow meter 1 is connected to a control module through a cable, and the cable is wound on a winch; the centralizer 2 includes a rubber plug 201 and a rope cap head 204 respectively arranged at both ends, the rubber plug 201 is connected to the flow meter 1, a fixing ring 203 is arranged between the rubber plug 201 and the rope cap head 204, and four wedge-shaped centralizing blocks 202 are arranged on the fixing ring 203.

[0033] The flow meter 1 includes a shell 101 of a column-shaped structure, an instrument upper joint 114 is fixedly connected to one end of the shell 101 along the axial direction, and the instrument upper joint 114 is connected to the rubber plug 201. A limit key 102 is fixedly connected to the outer wall of the other end of the shell 101. An adjustment arm 115 is provided on the side of the limit key 102 away from the end of the shell 101, and the adjustment arm 115 is hinged on the outer wall of the shell 101. A pressure-bearing outer casing 104 is provided on the end of the adjustment arm 115 away from the limit key 102, and the outer wall of the pressure-bearing outer casing 104 is tightly fitted with the inner wall of the shell 101, and the pressure-bearing outer casing 104 is embedded in the shell 101; a motor 103 is embedded in the pressure-bearing outer casing 104. The end of the pressure-bearing outer casing 104 away from the adjustment arm 115 is provided with a first protective tube 106, the outer wall of the first protective tube 106 is closely fitted with the inner wall of the shell 101, the first protective tube 106 is embedded in the shell 101, and the magnetic positioning sensor 105 is arranged in the first protective tube 106. The end of the first protective tube 106 away from the pressure-bearing outer casing 104 is provided with a first card slot 107 and a second card slot 109 in sequence, the first card slot 107 and the second card slot 109 are fixed to the inner wall of the shell 101, and a circuit board 108 is embedded between the first card slot 107 and the second card slot 109. A circuit board guard plate 111 is provided between the first card slot 107 and the second card slot 109, the circuit board guard plate 111 is fitted with the inner wall of the shell 101, the circuit board guard plate 111 is covered on the circuit board 108, and an insulating layer 110 is provided between the circuit board 108 and the circuit board guard plate 111. A temperature sensor 112 and a pressure sensor 113 are disposed between the second card slot 109 and the upper connector 114 of the instrument. The temperature sensor 112 and the pressure sensor 113 are embedded in the housing 101 .

[0034] The utility model designs the sensor and the motor 103 as discrete structures, which improves the space utilization and reduces the outer diameter of the instrument to less than or equal to 40 mm. This design effectively avoids the problem of instrument well jamming caused by the reduction of the inner diameter due to scaling of the wellbore. In addition, the design of the discrete structure is also conducive to the separate removal of a certain sensor or motor 103, which makes maintenance and inspection more convenient, avoids damage to the sensor or motor 103 during the disassembly process, and also saves maintenance time and labor costs. By improving the structure of the stabilizer 2, the structure of the stabilizer 2 is made more stable and durable, so that the flow meter 1 can be operated more smoothly during the underground operation, reducing the risk of well jamming.

Claims

1. A flow rate testing system for a wellbore, characterized in that: It comprises a flow meter (1), one end of the flow meter (1) is connected to a centralizer (2), and the end of the centralizer (2) away from the flow meter (1) is connected to a control module via a cable, and the cable is wound on a winch; The centralizer (2) comprises a rubber plug (201) and a rope cap head (204) respectively arranged at two end portions, the rubber plug (201) being connected to the flow meter (1), a fixing ring (203) being arranged between the rubber plug (201) and the rope cap head (204), and a plurality of wedge-shaped centralizing blocks (202) being arranged on the fixing ring (203).

2. The flow rate testing system for a wellbore according to claim 1, characterized in that: The flow meter (1) comprises a shell (101) of a tubular column structure, one end of the shell (101) is fixedly connected to an instrument upper joint (114) along the axial direction, the instrument upper joint (114) is connected to a rubber plug (201), and a limit key (102) is fixedly connected to the outer wall of the other end of the shell (101).

3. The flow rate testing system for a wellbore according to claim 2, characterized in that: An adjustment arm (115) is provided on one side of the limit key (102) away from the end of the shell (101), and the adjustment arm (115) is hinged on the outer wall of the shell (101).

4. The flow rate testing system for a wellbore according to claim 3, characterized in that: A pressure-bearing outer casing (104) is provided at one end of the regulating arm (115) away from the limit key (102); the outer wall of the pressure-bearing outer casing (104) is tightly fitted with the inner wall of the shell (101); the pressure-bearing outer casing (104) is embedded in the shell (101); and a motor (103) is embedded in the pressure-bearing outer casing (104).

5. The flow rate testing system for a wellbore according to claim 4, characterized in that: A first protective tube (106) is arranged at one end of the pressure-bearing outer protective tube (104) away from the adjusting arm (115); the outer wall of the first protective tube (106) is tightly fitted with the inner wall of the shell (101); the first protective tube (106) is embedded in the shell (101); and a magnetic positioning sensor (105) is arranged in the first protective tube (106).

6. The flow rate testing system for a wellbore according to claim 5, characterized in that: A first card slot (107) and a second card slot (109) are sequentially arranged at one end of the first protective tube (106) away from the pressure-bearing outer protective tube (104); the first card slot (107) and the second card slot (109) are fixedly connected to the inner wall of the shell (101); and a circuit board (108) is embedded between the first card slot (107) and the second card slot (109).

7. The flow rate testing system for a wellbore according to claim 6, characterized in that: A circuit board guard plate (111) is provided between the first card slot (107) and the second card slot (109); the circuit board guard plate (111) is in contact with the inner wall of the housing (101); the circuit board guard plate (111) is sheathed on the circuit board (108); and an insulating layer (110) is provided between the circuit board (108) and the circuit board guard plate (111).

8. The flow rate testing system for a wellbore according to claim 7, characterized in that: A temperature sensor (112) and a pressure sensor (113) are provided between the second card slot (109) and the upper connector (114) of the instrument. The temperature sensor (112) and the pressure sensor (113) are embedded in the housing (101).

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