A long-term downhole wax removal device and method
By setting downhole tool short sections and casing short sections on the oil pipes and casings, and using electromagnetic ultrasonic technology to remove wax grafts in the oil well, the problem of low wax removal efficiency in the prior art is solved, and a long-term wax removal effect with low energy consumption, short wax removal time and strong adaptability is achieved.
Patent Information
- Application Number
- CN202510193366.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-04-04
AI Technical Summary
The prior art is difficult to effectively remove wax from oil wells during oil and gas development, resulting in damage to oil and gas reservoirs and blockage of oil and gas channels on the wellbore, affecting the efficiency of crude oil collection and transportation.
A long-effect downhole wax removal device is designed to remove wax by setting downhole tool short sections and casing short sections on the oil pipe and casing. The device includes downhole tool short sections, casing short sections, ground controllers and coils. Through electromagnetic ultrasonic waves, it changes its properties, destroys adhesion and achieves wax removal.
It has achieved a long-term downhole wax removal effect with low energy consumption, short wax removal time and strong adaptability, and improved the efficiency of oil and gas development and the smoothness of oil wells.
Smart Images
Figure CN119754738A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of oil well descaling and wax removal, and in particular to a long-acting downhole wax removal device and a method thereof. Background Art
[0002] The wax deposition problem in crude oil is very destructive in the process of oil and gas development. Waxing can cause damage to oil and gas reservoirs, block oil and gas channels in wellbores, reduce oil phase permeability, narrow the pipeline channel, increase pressure loss, and reduce the efficiency of crude oil gathering and transportation; increase the risk of ball jamming during the cleaning ball passing operation. Paraffin deposition has viscosity-temperature characteristics. As the temperature rises, the viscosity drops sharply. In order to prevent paraffin from depositing on the pipe wall and reducing the transportation capacity of crude oil, the commonly used wax removal technologies in the petroleum industry are: thermal wax prevention, chemical wax prevention, mechanical wax removal, coating wax prevention, microbial wax prevention, and magnetic wax prevention. These methods are often affected by factors such as reservoir permeability, thermal conductivity, heat loss of the cap layer and heat loss along the steam injection process, original formation pressure, and the sweep coefficient of injected hot fluid, resulting in poor results in some oil reservoirs. Summary of the invention
[0003] The purpose of the present invention is to provide a long-lasting downhole wax removal device, which is provided with a downhole tool nipple and a casing nipple on the oil pipe and the casing, can generate electromagnetic ultrasound, has the advantages of low energy consumption, short wax removal time and strong adaptability.
[0004] Another object of the present invention is to provide a long-term downhole wax removal method, in which downhole tool pup joints and casing pup joints are provided on the oil pipe and casing, which can generate electromagnetic ultrasound and have the advantages of low energy consumption, short wax removal time and strong adaptability.
[0005] To achieve the above object, the present invention adopts the following technical solutions, including:
[0006] Downhole tool nipple, which is set at the wax-prone part of the oil pipe and is detachably connected to the oil pipe;
[0007] A casing nipple, which is arranged on the casing, corresponds to the position of the downhole tool nipple, and is detachably connected to the casing; a magnet is arranged in the casing nipple;
[0008] A ground controller, which is electrically connected to the downhole tool short section through a cable and is used to output direct current;
[0009] The downhole tool short section includes an excitation circuit, an ultrasonic transducer and a coil; the excitation circuit is electrically connected to the ground controller through a cable, and is used to convert the direct current output by the ground controller into an excitation current; the ultrasonic transducer is used to convert the excitation current into a high-frequency excitation current and output it to the coil. After the high-frequency excitation current is passed through the coil, an induced eddy current is formed on the surface of the downhole tool short section. The induced eddy current is subjected to the Lorentz force under the magnetic field of the magnet to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, paraffin molecules and the junctions with the oil pipe, changes the properties of the molecules, destroys the adhesion, and achieves wax removal.
[0010] Preferably, the length of the downhole tool pup section is 2 to 10 m.
[0011] Preferably, the ultrasonic frequency emitted by the ultrasonic transducer is 1-10 MHz.
[0012] Preferably, the number of turns of the coil is 1200 to 5000 turns.
[0013] Preferably, the magnet is a permanent magnet.
[0014] Preferably, joints for threaded connection with the oil pipe are respectively provided at both ends of the downhole tool pup joint, and joints for threaded connection with the casing are respectively provided at both ends of the casing pup joint.
[0015] A long-term downhole wax removal method, using any of the long-term downhole wax removal devices described above, comprises the following steps:
[0016] S1. Setting the downhole tool pup joint at a location on the tubing where wax is easily deposited, and setting the casing pup joint at a location on the casing corresponding to the downhole tool pup joint;
[0017] S2, the ground controller is electrically connected to the downhole tool short section through a cable;
[0018] S3. When wax removal is required, the ground controller outputs direct current to the downhole tool short section, and the excitation circuit in the downhole tool short section converts the direct current output by the ground controller into an excitation current; the ultrasonic transducer converts the excitation current into a high-frequency excitation current and outputs it to the coil. After the high-frequency excitation current is passed through the coil, an induced eddy current is formed on the surface of the downhole tool short section. The induced eddy current is acted upon by the Lorentz force under the magnetic field of the magnet to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, the paraffin molecules and the junctions with the oil pipe, changes the properties of the molecules, destroys the adhesion, and achieves wax removal.
[0019] The beneficial effects of the present invention are as follows: downhole tool nipples and casing nipples are provided on the oil pipe and casing, which can generate electromagnetic ultrasound and have the advantages of low energy consumption, short wax removal time and strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of a long-acting downhole wax removal device of the present invention.
[0021] Figure 2 It is a schematic diagram of the downhole tool pup joint in the present invention.
[0022] Figure 3 It is a schematic diagram of the casing short section in the present invention. DETAILED DESCRIPTION
[0023] The invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.
[0024] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or other elements or combinations thereof.
[0025] Example 1
[0026] like Figure 1-3 As shown, a long-acting downhole wax removal device 1 of the present invention comprises:
[0027] The downhole tool sub 110 is arranged at a wax-prone location on the oil pipe 2 and is detachably connected to the oil pipe 2; the casing sub 120 is arranged on the casing 3, corresponding to the position of the downhole tool sub 110, and is detachably connected to the casing 3; a magnet 121 is arranged in the casing sub 120; a ground controller 130 is electrically connected to the downhole tool sub 110 through a cable 140 for outputting direct current; wherein the downhole tool sub 110 includes an excitation circuit 111, an ultrasonic transducer 112 and a coil 113; the excitation circuit 111 is connected to the casing 3 through the cable 140. 0 is electrically connected to the ground controller 130, and is used to convert the direct current output by the ground controller 130 into an excitation current; the ultrasonic transducer 112 is used to convert the excitation current into a high-frequency excitation current and output it to the coil 113. After the high-frequency excitation current is passed through the coil 113, an induced eddy current is formed on the surface of the downhole tool short section 110. The induced eddy current is subjected to the Lorentz force under the magnetic field of the magnet 121 to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, paraffin molecules and their combination with the oil pipe, changing the properties of the molecules, destroying the adhesion, and achieving wax removal. The length of the downhole tool short section 110 is 2m. The ultrasonic frequency emitted by the ultrasonic transducer 112 is 10MHz. The number of turns of the coil 113 is 1200 turns. The magnet 121 is a permanent magnet. Connectors for threaded connection with the oil pipe are provided at both ends of the downhole tool short section, and connectors for threaded connection with the casing are provided at both ends of the casing short section.
[0028] A long-term downhole wax removal method, using the long-term downhole wax removal device 1, comprises the following steps:
[0029] S1. The downhole tool sub 110 is arranged at a wax-prone location on the oil pipe 2, and the casing sub 120 is arranged at a location on the casing 3 corresponding to the downhole tool sub;
[0030] S2. The ground controller 130 is electrically connected to the downhole tool sub 110 via the cable 140;
[0031] S3. When wax removal is required, the ground controller 130 outputs direct current to the downhole tool short section 110. The excitation circuit 111 in the downhole tool short section 110 converts the direct current output by the ground controller 130 into an excitation current. The ultrasonic transducer 112 converts the excitation current into a high-frequency excitation current and outputs it to the coil. After the high-frequency excitation current is passed through the coil 113, an induced eddy current is formed on the surface of the downhole tool short section 110. The induced eddy current is subjected to the Lorentz force under the magnetic field of the magnet 121 to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, paraffin molecules and the junctions with the oil pipe, changes the properties of the molecules, destroys the adhesion, and achieves wax removal.
[0032] Example 2
[0033] like Figure 1-3 As shown, a long-acting downhole wax removal device 1 of the present invention comprises:
[0034] The downhole tool sub 110 is arranged at a wax-prone location on the oil pipe 2 and is detachably connected to the oil pipe 2; the casing sub 120 is arranged on the casing 3, corresponding to the position of the downhole tool sub 110, and is detachably connected to the casing 3; a magnet 121 is arranged in the casing sub 120; a ground controller 130 is electrically connected to the downhole tool sub 110 through a cable 140 for outputting direct current; wherein the downhole tool sub 110 includes an excitation circuit 111, an ultrasonic transducer 112 and a coil 113; the excitation circuit 111 is connected to the casing 3 through the cable 140. 0 is electrically connected to the ground controller 130, and is used to convert the direct current output by the ground controller 130 into an excitation current; the ultrasonic transducer 112 is used to convert the excitation current into a high-frequency excitation current and output it to the coil 113. After the high-frequency excitation current is passed through the coil 113, an induced eddy current is formed on the surface of the downhole tool short section 110. The induced eddy current is subjected to the Lorentz force under the magnetic field of the magnet 121 to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, paraffin molecules and their combination with the oil pipe, changing the properties of the molecules, destroying the adhesion, and achieving wax removal. The length of the downhole tool short section 110 is 10m. The ultrasonic frequency emitted by the ultrasonic transducer 112 is 1MHz. The number of turns of the coil 113 is 5000 turns. The magnet 121 is a permanent magnet. Connectors for threaded connection with the oil pipe are provided at both ends of the downhole tool short section, and connectors for threaded connection with the casing are provided at both ends of the casing short section.
[0035] A long-term downhole wax removal method, using the long-term downhole wax removal device 1, comprises the following steps:
[0036] S1. The downhole tool sub 110 is arranged at a wax-prone location on the oil pipe 2, and the casing sub 120 is arranged at a location on the casing 3 corresponding to the downhole tool sub;
[0037] S2. The ground controller 130 is electrically connected to the downhole tool sub 110 via the cable 140;
[0038] S3. When wax removal is required, the ground controller 130 outputs direct current to the downhole tool short section 110. The excitation circuit 111 in the downhole tool short section 110 converts the direct current output by the ground controller 130 into an excitation current. The ultrasonic transducer 112 converts the excitation current into a high-frequency excitation current and outputs it to the coil. After the high-frequency excitation current is passed through the coil 113, an induced eddy current is formed on the surface of the downhole tool short section 110. The induced eddy current is subjected to the Lorentz force under the magnetic field of the magnet 121 to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, paraffin molecules and the junctions with the oil pipe, changes the properties of the molecules, destroys the adhesion, and achieves wax removal.
[0039] Example 3
[0040] like Figure 1-3 As shown, a long-acting downhole wax removal device 1 of the present invention comprises:
[0041] The downhole tool sub 110 is arranged at a wax-prone location on the oil pipe 2 and is detachably connected to the oil pipe 2; the casing sub 120 is arranged on the casing 3, corresponding to the position of the downhole tool sub 110, and is detachably connected to the casing 3; a magnet 121 is arranged in the casing sub 120; a ground controller 130 is electrically connected to the downhole tool sub 110 through a cable 140 for outputting direct current; wherein the downhole tool sub 110 includes an excitation circuit 111, an ultrasonic transducer 112 and a coil 113; the excitation circuit 111 is connected to the casing 3 through the cable 140. 0 is electrically connected to the ground controller 130, and is used to convert the direct current output by the ground controller 130 into an excitation current; the ultrasonic transducer 112 is used to convert the excitation current into a high-frequency excitation current and output it to the coil 113. After the high-frequency excitation current is passed through the coil 113, an induced eddy current is formed on the surface of the downhole tool short section 110. The induced eddy current is subjected to the Lorentz force under the magnetic field of the magnet 121 to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, paraffin molecules and their combination with the oil pipe, changing the properties of the molecules, destroying the adhesion, and achieving wax removal. The length of the downhole tool short section 110 is 5m. The ultrasonic frequency emitted by the ultrasonic transducer 112 is 5MHz. The number of turns of the coil 113 is 3000 turns. The magnet 121 is a permanent magnet. Connectors for threaded connection with the oil pipe are provided at both ends of the downhole tool short section, and connectors for threaded connection with the casing are provided at both ends of the casing short section.
[0042] A long-term downhole wax removal method, using the long-term downhole wax removal device 1, comprises the following steps:
[0043] S1. The downhole tool sub 110 is arranged at a wax-prone location on the oil pipe 2, and the casing sub 120 is arranged at a location on the casing 3 corresponding to the downhole tool sub;
[0044] S2. The ground controller 130 is electrically connected to the downhole tool sub 110 via the cable 140;
[0045] S3. When wax removal is required, the ground controller 130 outputs direct current to the downhole tool short section 110. The excitation circuit 111 in the downhole tool short section 110 converts the direct current output by the ground controller 130 into an excitation current. The ultrasonic transducer 112 converts the excitation current into a high-frequency excitation current and outputs it to the coil. After the high-frequency excitation current is passed through the coil 113, an induced eddy current is formed on the surface of the downhole tool short section 110. The induced eddy current is subjected to the Lorentz force under the magnetic field of the magnet 121 to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, paraffin molecules and the junctions with the oil pipe, changes the properties of the molecules, destroys the adhesion, and achieves wax removal.
[0046] In summary, the present invention provides a long-acting downhole wax removal device 1, which is provided with a downhole tool nipple 110 and a casing nipple 120 on the oil pipe 2 and the casing 3, and can generate electromagnetic ultrasound, and has the advantages of low energy consumption, short wax removal time, and strong adaptability.
[0047] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.
Claims
1. A long-term downhole wax removal device, characterized in that: include: Downhole tool nipple, which is set at the wax-prone part of the oil pipe and is detachably connected to the oil pipe; A casing nipple, which is arranged on the casing, corresponds to the position of the downhole tool nipple, and is detachably connected to the casing; a magnet is arranged in the casing nipple; A ground controller, which is electrically connected to the downhole tool short section through a cable and is used to output direct current; The downhole tool short section includes an excitation circuit, an ultrasonic transducer and a coil; the excitation circuit is electrically connected to the ground controller through a cable, and is used to convert the direct current output by the ground controller into an excitation current; the ultrasonic transducer is used to convert the excitation current into a high-frequency excitation current and output it to the coil. After the high-frequency excitation current is passed through the coil, an induced eddy current is formed on the surface of the downhole tool short section. The induced eddy current is subjected to the Lorentz force under the magnetic field of the magnet to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, paraffin molecules and the junctions with the oil pipe, changes the properties of the molecules, destroys the adhesion, and achieves wax removal.
2. The long-acting downhole wax removal device according to claim 1 is characterized in that: The length of the downhole tool pup section is 2 to 10 m.
3. The long-acting downhole wax removal device according to claim 1 or 2, characterized in that: The ultrasonic frequency emitted by the ultrasonic transducer is 1-10 MHz.
4. The long-acting downhole wax removal device according to claim 1 or 2, characterized in that: The number of turns of the coil is 1200 to 5000 turns.
5. The long-acting downhole wax removal device according to claim 1 or 2, characterized in that: The magnet is a permanent magnet.
6. The long-acting downhole wax removal device according to claim 1 or 2, characterized in that: Joints for threaded connection with the oil pipe are respectively arranged at both ends of the downhole tool pup joint, and joints for threaded connection with the casing are respectively arranged at both ends of the casing pup joint.
7. A long-term downhole wax removal method, using the long-term downhole wax removal device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Setting the downhole tool pup joint at a location on the tubing where wax is easily deposited, and setting the casing pup joint at a location on the casing corresponding to the downhole tool pup joint; S2, the ground controller is electrically connected to the downhole tool short section through a cable; S3. When wax removal is required, the ground controller outputs direct current to the downhole tool short section, and the excitation circuit in the downhole tool short section converts the direct current output by the ground controller into an excitation current; the ultrasonic transducer converts the excitation current into a high-frequency excitation current and outputs it to the coil. After the high-frequency excitation current is passed through the coil, an induced eddy current is formed on the surface of the downhole tool short section. The induced eddy current is acted upon by the Lorentz force under the magnetic field of the magnet to generate electromagnetic ultrasound. The electromagnetic ultrasound acts on the heavy oil molecules, the paraffin molecules and the junctions with the oil pipe, changes the properties of the molecules, destroys the adhesion, and achieves wax removal.