Visual shaft detection tool and use method thereof

Abstract

The invention relates to the technical field of oil field underground construction, in particular to a shaft visual detection tool and a using method thereof.The shaft visual detection tool comprises a hanging cable, one end of the hanging cable is connected with monitoring and control equipment, and the other end of the hanging cable is connected with an instrument cylinder in a hanging mode; a packer is mounted on the outer side of the instrument barrel; a pushing and pressing plug is connected into a cavity of the instrument barrel in a sliding and sealing mode, a light supplementing lamp and a camera are arranged at the bottom of the pushing and pressing plug and connected with the hanging cable through wires, and a blasting plug is fixedly arranged at the position, below the pushing and pressing plug, in the cavity of the instrument barrel. And a cavity between the blasting plug and the pushing plug in the cavity of the instrument cylinder is filled with clear water. According to the method, well washing operation does not need to be carried out in advance, visual detection can be carried out in the oil-containing, sand-producing and even mud environment, the adaptability of the visual detection technology is greatly improved, the detection construction period is shortened, and the operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield downhole construction, and in particular to a wellbore visualization detection tool and a use method thereof. Background Art

[0002] With the deepening of oil field development, the underground conditions of oil and water wells are becoming increasingly complex. Visual detection technology can conduct real-time, dynamic and intuitive video detection of oil and water well bores, obtain the accurate shape of the wellbore, and provide a reliable basis for subsequent measures. It has great advantages over technologies such as lead printing detection and multi-arm wellbore detection.

[0003] Current visualization detection equipment mainly consists of a monitoring and control device and a camera connected to the monitoring and control device via a cable. When in use, the camera is lowered into a predetermined position in the well to capture images, such as an oil field downhole television video transmission device disclosed in CN201320039372.6.

[0004] However, visualization detection technology has very high requirements on the cleanliness of the liquid in the wellbore. The liquid needs to meet the light transmittance requirements to obtain clear video images. Therefore, during the on-site implementation, it is necessary to repeatedly wash the well to eliminate crude oil and impurities in the well fluid in order to obtain a clearer image. The preparation work for repeated well washing has a long construction period and high cost, especially in some deeper locations where it is difficult to obtain clear images. Summary of the invention

[0005] The purpose of the present invention is to address the defects of the prior art and provide a wellbore visualization detection tool and a method of using the same, which enables visual detection to be performed in oil-containing, sand-producing, or even muddy environments without the need for prior well washing operations, greatly improving the adaptability of visualization detection technology, shortening the detection construction period, and reducing operating costs.

[0006] The technical solution of the present invention is: a wellbore visualization detection tool, comprising a hanging cable, one end of the hanging cable is connected to a monitoring and control device, the other end of the hanging cable is suspended and connected to an instrument barrel, and a packer is installed on the outside of the instrument barrel; A pushing plug is slidingly and sealingly connected in the cavity of the instrument tube, a fill light and a camera are provided at the bottom of the pushing plug, the fill light and the camera are connected to the hanging cable through a wire, a bursting plug is fixedly provided in the cavity of the instrument tube below the pushing plug, and the cavity between the bursting plug and the pushing plug in the cavity of the instrument tube is filled with clean water.

[0007] Preferably, a faucet is provided on the top of the instrument tube, and is suspended and connected to a suspension cable via the faucet.

[0008] Preferably, the faucet or the top of the instrument tube is provided with a pressure transmission hole connected to the inner cavity of the instrument tube.

[0009] Preferably, the packer is an electric packer, which is connected to a suspension cable conductor and controlled by a monitoring and control device.

[0010] Preferably, a transparent protective cover for covering the fill light and the camera is provided at the bottom of the push plug.

[0011] Preferably, the middle part of the instrument tube is a transparent glass tube, and the two ends are metal tubes.

[0012] Preferably, the wires connecting the fill light and the camera to the suspension cable, and the suspension cable are all armored cables.

[0013] A method for using a wellbore visualization detection tool comprises the following steps: First, the instrument tube is lowered into the well to the predetermined detection position using the hanging cable; Next, start the packer setting; Next, hydraulic pressure is pumped in from the surface. The hydraulic pressure enters the instrument barrel cavity from the top, thereby pushing the push plug downward. When the push plug compresses the clean water to a certain pressure, the blasting plug ruptures, and the clean water flows out from the bottom of the instrument barrel, replacing a section of the original well fluid in the wellbore. Finally, the camera is illuminated by a fill light, and the images taken by the camera are transmitted to the monitoring and control equipment by hanging cables.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention adopts the method of fixed-point squeezing and replacing well fluid with clean water to form an environment conducive to the implementation of visual detection, and realizes that there is no need to perform well washing operations in advance. Visual detection can be performed in an environment containing oil, sand, or even mud, which greatly improves the adaptability of visual detection technology, shortens the detection construction period, and reduces operating costs.

[0015] The present invention preferentially adopts electric packers to seal the wellbore. The setting and unsealing actions of the electric packers are uniformly controlled by ground monitoring and control equipment. Compared with traditional hydraulically driven packers, it eliminates the tedious steps of designing hydraulic flow channels and setting hydraulic pressure, and has the advantages of fast construction speed and fast control response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; In the picture: 1. Suspension cable, 2. Malt tap, 3. Pressure transmission hole, 4. Monitoring and control equipment, 5. Packer, 6. Instrument tube, 7. Push plug, 8. Transparent protective cover, 9. Fill light and camera, 10. Clean water, 11. Blasting plug. DETAILED DESCRIPTION

[0017] The present invention is further described below with reference to the accompanying drawings and embodiments. Example 1

[0018] like Figure 1 A wellbore visualization detection tool includes a hanging cable 1, one end of which is connected to a monitoring and control device 4, and the other end of the hanging cable 1 is suspended and connected to an instrument tube 6, and a packer 5 is installed on the outside of the instrument tube 6.

[0019] A push plug 7 is slidably and sealably connected to the cavity of the instrument tube 6 , and a fill light and a camera 9 are provided at the bottom of the push plug 7 .

[0020] The fill light and the camera 9 are connected to the suspension cable 1 through wires. The wires connecting the fill light and the camera 9 and the suspension cable 1, as well as the suspension cable 1 are all armored cables with high structural strength.

[0021] A bursting plug 11 is fixedly provided in the cavity of the instrument tube 6 below the pushing plug 7 , and clean water 10 is filled in the cavity between the bursting plug 11 and the pushing plug 7 in the cavity of the instrument tube 6 . Example 2

[0022] This embodiment is a method for using a wellbore visualization detection tool in Embodiment 1, and specifically includes the following steps: First, the instrument tube 6 is lowered into the well to a predetermined detection position using a hanging cable.

[0023] Next, the packer 5 is started to seal.

[0024] Next, hydraulic pressure is pumped in from the ground, and the hydraulic pressure enters the cavity of the instrument tube 6 from above, thereby pushing the push plug 7 downward. When the push plug compresses the clean water 10 to a certain pressure, the bursting plug 11 ruptures, and the clean water 10 flows out from the bottom of the instrument tube 6 to replace a section of the original well fluid in the wellbore.

[0025] Finally, the camera is supplemented with light by a fill light, and the image captured by the camera is transmitted to the monitoring and control device 4 by the hanging cable 1.

[0026] After the detection is completed, the packer 5 is unsealed, and then the instrument tube 6 is lifted back to the surface through the hanging cable 1.

[0027] The present invention adopts a method of fixed-point squeezing of clean water 10 to replace well fluid, thereby forming an environment conducive to the implementation of visual detection, and achieving the goal of not having to perform well washing operations in advance. Visual detection can be performed in an environment containing oil, sand, or even mud, which greatly improves the adaptability of visual detection technology, shortens the detection construction period, and reduces operating costs. Example 3

[0028] This embodiment is optimized based on the above embodiment, specifically: The packer 5 is an electric packer, which is connected to the wire of the suspension cable 1 and controlled by the monitoring and control device 4 .

[0029] The present invention preferentially adopts an electric packer to seal the wellbore. The sealing and unsealing actions of the electric packer are uniformly controlled by the monitoring and control equipment 4 on the ground. Compared with the traditional hydraulically driven packer 5, it eliminates the tedious steps of designing the hydraulic flow channel and the sealing hydraulic pressure, and has the advantages of fast construction speed and fast control response speed. Example 4

[0030] This embodiment is optimized based on the above embodiment, specifically: A faucet 2 is provided on the top of the instrument tube 6, and is suspended and connected to a suspension cable through the faucet 2. The faucet 2 makes it easier to perform a suspension connection between the instrument tube 6 and the cable.

[0031] A pressure transmission hole 3 communicating with the inner cavity of the instrument tube 6 is provided on the top of the faucet 2 or the instrument tube 6. When the ground is pressurized, the pressure can enter the cavity of the instrument tube 6 through the pressure transmission hole 3 to push the push plug 7 downward. Example 5

[0032] This embodiment is optimized based on the above embodiment, specifically: A transparent protective cover 8 is provided at the bottom of the push plug 7 to cover the fill light and the camera 9 inside. The transparent protective cover 8 prevents the liquid in the well and the pressure in the well from affecting the fill light and the camera 9, thereby improving the operating stability and service life of the equipment.

[0033] The middle part of the instrument tube 6 is a transparent glass tube, and the two ends are metal tubes. The middle part adopts a transparent design, and the situation in the well can also be detected during the process of being lowered into the well. The design of metal tubes at both ends prevents the instrument tube 6 from colliding and rubbing with the well wall when going up and down, directly acting on the two ends of the transparent glass tube, thereby improving the overall structural strength and making the structure more reasonable and reliable.

[0034] The present invention is not limited to the above-mentioned embodiments. Various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention. The changed contents still fall within the protection scope of the present invention.

Claims

1. A wellbore visualization detection tool, comprising a hanging cable, one end of which is connected to a monitoring and control device, characterized in that: The other end of the suspension cable is suspended and connected with an instrument cylinder, and a packer is installed on the outside of the instrument cylinder; A pushing plug is slidingly and sealingly connected in the cavity of the instrument tube, a fill light and a camera are provided at the bottom of the pushing plug, the fill light and the camera are connected to the hanging cable through a wire, a bursting plug is fixedly provided in the cavity of the instrument tube below the pushing plug, and the cavity between the bursting plug and the pushing plug in the cavity of the instrument tube is filled with clean water.

2. A wellbore visualization detection tool and a method of using the same according to claim 1, characterized in that: A faucet is arranged on the top of the instrument tube, and is suspended and connected with a suspension cable through the faucet.

3. A wellbore visualization detection tool and a method of using the same according to claim 2, characterized in that: The top of the faucet or the instrument tube is provided with a pressure transmission hole which is connected with the inner cavity of the instrument tube.

4. A wellbore visualization detection tool and a method of using the same according to claim 1, characterized in that: The packer is an electric packer, which is connected to a suspension cable conductor and controlled by a monitoring and control device.

5. A wellbore visualization detection tool and a method of using the same according to claim 1, characterized in that: A transparent protective cover for covering the fill light and the camera is arranged at the bottom of the push plug.

6. A wellbore visualization detection tool and a method of using the same according to claim 1, characterized in that: The middle part of the instrument tube is a transparent glass tube body, and the two ends are metal tube bodies.

7. A wellbore visualization detection tool and a method of using the same according to claim 1, characterized in that: The wires connecting the fill light and the camera to the suspension cable, as well as the suspension cable are all armored cables.

8. A method for using a wellbore visualization detection tool according to any one of claims 1 to 7, characterized in that: The following steps are involved: First, the instrument tube is lowered into the well to the predetermined detection position using the hanging cable; Next, start the packer setting; Next, hydraulic pressure is pumped in from the surface. The hydraulic pressure enters the instrument barrel cavity from the top, thereby pushing the push plug downward. When the push plug compresses the clean water to a certain pressure, the blasting plug ruptures, and the clean water flows out from the bottom of the instrument barrel, replacing a section of the original well fluid in the wellbore. Finally, the camera is illuminated by a fill light, and the images taken by the camera are transmitted to the monitoring and control equipment by hanging cables.

Images