Ultrasonic coalescence nanometer film and underground hydraulic cyclone oil-water separation combined pipe column

Abstract

The invention discloses an ultrasonic coalescence nano film and underground hydraulic cyclone oil-water separation combined tubular column. Comprising an oil pipe; the steering and shunting assembly and the perforated inclined guide are respectively arranged on the oil pipe and are respectively positioned above and below the positioning and inserting seal; the lower end of the reinjection pipe is connected with the upper end of the oil pipe; the flow state conversion three-way device is arranged above the reinjection pipe, an inlet, a first outlet and a second outlet are formed in the flow state conversion three-way device, and the first outlet and the second outlet are respectively communicated with the inlet; the hydrocyclone, the piezoelectric element and the electric submersible pump are sequentially arranged from top to bottom, and the upper end of the hydrocyclone is connected with the inlet; and the nano-film working barrel is arranged at the upper part of the reinjection pipe in a setting manner. The oil-water separator has the beneficial effect that the oil-water separator has a good oil-water separation effect.

Description

Technical Field

[0001] The invention relates to the technical field of downhole oil-water separation, and in particular to a combined pipe column for downhole oil-water separation using an ultrasonic nano-membrane and a hydrocyclone. Background Art

[0002] Downhole oil-water separation technology can effectively solve the problem of high water content by separating the oil and water in the formation production fluid directly underground, and directly injecting part of the production water back into the water injection layer in the same well. The remaining oil-rich production fluid is lifted to the wellhead by an electric pump, thereby greatly reducing the amount of water produced at the wellhead.

[0003] The main method of downhole oil-water separation currently used is hydrocyclone separation. This separation method has certain requirements for the density difference between oil and water when selecting wells. At the same time, it requires the produced fluid to have a higher water content, which is more suitable for high-water-content oil wells with a water content of about 90%, which narrows its application range. In actual production, the size of oil droplets is also a sensitive parameter for its separation effect. Too small oil droplets are difficult to be effectively separated by hydrocyclone; and the split ratio cannot be too large, otherwise the separation effect based on hydrocyclone separation will be greatly affected. In addition, the produced fluid needs to be pressurized and lifted by an electric pump first, and it is inevitably affected by the shearing effect of the electric pump, causing emulsification and affecting the separation effect of hydrocyclone.

[0004] Research on Nano-membrane Downhole Oil-Water Separation Technology At present, there are many cases of using new membrane materials for oil-water two-phase separation at home and abroad, but they are rarely used in downhole oil-water separation. The reason is that the underground space and harsh environment are not conducive to the arrangement and cleaning of membrane materials, and the membrane material separation technology on the ground cannot be directly copied and applied underground. Summary of the invention

[0005] The purpose of the present invention is to provide an ultrasonic polymerization nano-membrane and downhole hydraulic cyclone oil-water separation combined pipe string, which is equipped with an oil pipe, a steering diversion assembly, a perforated inclination, a reinjection pipe, a flow state conversion three-way device, a hydraulic cyclone, a piezoelectric element, an electric submersible pump and a nano-membrane working cylinder, and has a good water-oil separation effect.

[0006] To achieve the above object, the present invention adopts the following technical solutions, including:

[0007] The oil pipe is arranged in the casing; an insert seal matching the stratified packer at the lower end of the water injection layer in the casing is arranged at the lower part of the oil pipe; a positioning insert seal matching the stratified packer at the upper end of the water injection layer in the casing is arranged at the upper part of the oil pipe;

[0008] The steering and diversion assembly and the perforated whipstock are respectively arranged on the tubing and are respectively located above and below the positioning and inserting seal; a first channel and a second channel are provided in the steering and diversion assembly; the lower end of the first channel communicates with the tubing below the positioning and inserting seal; the upper end of the first channel communicates with the annulus between the tubing and the casing above the positioning and inserting seal; the lower end of the second channel communicates with the perforated whipstock; the upper end of the second channel communicates with the tubing above the positioning and inserting seal; the perforated whipstock communicates with the annulus between the tubing and the casing below the positioning and inserting seal;

[0009] The reinjection pipe, the lower end of which is connected to the upper end of the tubing;

[0010] The flow state conversion three-way device is arranged above the reinjection pipe. An inlet and a first outlet and a second outlet respectively communicating with the inlet are provided in the flow state conversion three-way device; the first outlet is arranged downward, the second outlet is arranged upward, and the first outlet and the second outlet communicate with each other; the first outlet is connected to the upper end of the reinjection pipe; the second outlet is connected to the lifting tubing;

[0011] The hydrocyclone, the piezoelectric element and the electrical submersible pump are arranged in sequence from top to bottom. The upper end of the hydrocyclone is connected to the inlet; the electrical submersible pump is used for boosting and lifting the formation produced fluid; the piezoelectric element is electrically connected to the ground controller and is used for coalescing the oil droplets in the micron size range in the formation produced fluid into large oil droplets; the hydrocyclone is used for oil-water separation to separate the formation produced fluid into oil-rich produced fluid and low oil-content sewage;

[0012] The nano-membrane working barrel is set in the upper part of the reinjection pipe. Only the water phase in the low oil-content sewage from the first outlet can pass through the nano-membrane working barrel and be reinjected into the injection layer along the reinjection pipe; the oil phase in the low oil-content sewage cannot pass through the nano-membrane working barrel and enters the lifting tubing through the second outlet.

[0013] Preferably, the piezoelectric element is electrically connected to the ground controller through a signal cable.

[0014] Preferably, above the flow state conversion three-way device, a cable passing packer is provided on the outer periphery of the lifting tubing.

[0015] Preferably, the nano-membrane working barrel includes:

[0016] The support barrel has a cylindrical structure with an opening at the lower end; screen holes are evenly distributed on the outer peripheral wall of the support barrel. The lower end of the support barrel is adapted to the step provided in the reinjection pipe, and the support barrel is set in the reinjection pipe;

[0017] The hydrophilic and oleophobic reticular membrane, which is in a cylindrical tubular structure, is sleeved on the outer periphery of the support cylinder and is used for allowing the water phase in the low-oil-content sewage from the first outlet to pass through. The oil phase in the low-oil-content sewage sequentially passes through the first outlet and the second outlet and enters the lifting oil pipe, and is lifted to the ground.

[0018] Preferably, a fishing head is provided at the upper end of the nano-membrane working cylinder.

[0019] Preferably, a power amplifier and a signal source are provided in the ground controller.

[0020] The beneficial effects of the present invention are as follows: there are provided an oil pipe, a steering and shunting assembly, a perforated whipstock, a reinjection pipe, a flow state conversion three-way device, a hydrocyclone, a piezoelectric element, an electrical submersible pump, and a nano-membrane working cylinder, and it has a good water-oil separation effect. Description of the Drawings

[0021] Figure 1 It is a cross-sectional view of a combined pipe string for ultrasonic coalescence nano-membrane and downhole hydrocyclone oil-water separation according to the present invention. Detailed Embodiments

[0022] The following further describes the invention in detail with reference to the drawings so that those skilled in the art can implement it according to the description in the specification.

[0023] It should be understood that the terms such as "having", "comprising", and "including" used herein do not exclude the presence or addition of one or other elements or their combinations.

[0024] As Figure 1 shown, a combined pipe string 1 for ultrasonic coalescence nano-membrane and downhole hydrocyclone oil-water separation according to the present invention includes:

[0025] An oil pipe 110, which is arranged in a casing 2; an insertion seal 111 adapted to a lower-layer packer 210 at the lower end of the water injection layer in the casing 2 is provided at the lower part of the oil pipe 110; a positioning insertion seal 112 adapted to an upper-layer packer 210 at the upper end of the water injection layer in the casing 2 is provided at the upper part of the oil pipe 110.

[0026] A diversion assembly 120 and a perforated whipstock 130, which are respectively arranged on the tubing 110 and are respectively located above and below the positioning insert seal 112; a first channel 121 and a second channel 122 are provided in the diversion assembly 120; the lower end of the first channel 121 communicates with the tubing 110 below the positioning insert seal 112; the upper end of the first channel 121 communicates with the annulus between the tubing 110 above the positioning insert seal 112 and the casing 2; the lower end of the second channel 122 is connected to the perforated whipstock 130; the upper end of the second channel 122 communicates with the tubing 110 above the positioning insert seal 112; the perforated whipstock 130 communicates with the annulus between the tubing 110 below the positioning insert seal 112 and the casing 2.

[0027] An injection pipe 140, the lower end of which is connected to the upper end of the tubing 110.

[0028] A flow state conversion three-way device 150, which is arranged above the injection pipe 140. An inlet and a first outlet and a second outlet respectively communicating with the inlet are provided in the flow state conversion three-way device 150; the first outlet is arranged downward, the second outlet is arranged upward, and the first outlet and the second outlet communicate with each other; the first outlet is connected to the upper end of the injection pipe 140; the second outlet is connected to the lifting tubing 160; as a preference, above the flow state conversion three-way device 150, a cable packer 220 is arranged on the outer periphery of the lifting tubing 160.

[0029] A hydrocyclone 171, a piezoelectric element 172 and an electric submersible pump 173, which are arranged in sequence from top to bottom. The upper end of the hydrocyclone 171 is connected to the inlet; the electric submersible pump 173 is used for boosting and lifting the formation produced fluid; the piezoelectric element 172 is electrically connected to a ground controller 174 and is used for coalescing micron-sized oil droplets in the formation produced fluid into large oil droplets; the hydrocyclone 171 is used for oil-water separation to separate the formation produced fluid into oil-rich produced fluid and low-oil-content sewage; as a preference, the piezoelectric element 172 is electrically connected to the ground controller 174 through a signal cable 175; as a further preference, a power amplifier and a signal source are provided in the ground controller 174.

[0030] The nano-film working barrel 180 is set at the upper part of the reinjection pipe 140. Only the water phase in the low oil-containing sewage from the first outlet can pass through the nano-film working barrel 180 and be reinjected into the water injection layer along the reinjection pipe 140. The oil phase in the low oil-containing sewage cannot pass through the nano-film working barrel 180 and enters the lifting oil pipe 160 through the second outlet. As a preference, the nano-film working barrel 180 includes: a support barrel, which is in a cylindrical barrel structure and has an opening at the lower end; sieve holes are evenly distributed on the outer peripheral wall of the support barrel, and the lower end of the support barrel is adapted to the step provided in the reinjection pipe, and the support barrel is set in the reinjection pipe; a hydrophilic and oleophobic net membrane, which is in a cylindrical tubular structure and is sleeved on the outer periphery of the support barrel for the water phase in the low oil-containing sewage from the first outlet to pass through. The oil phase in the low oil-containing sewage enters the lifting oil pipe through the first outlet and the second outlet in sequence and is lifted to the ground.

[0031] During use, the produced fluid enters the tubing 110 from the oil production layer through the casing 2, passes through the first channel 121 and enters the annulus above the positioning insertion seal 112, and is lifted by the electric submersible pump 173. When passing through the piezoelectric element 172, the ground control device 174 applies voltage excitation to the piezoelectric element 4 through the cable 175. The piezoelectric element 172 causes the oil droplets to coalesce from small oil droplets into large oil droplets, and then enters the upper hydrocyclone 171 for oil-water two-phase separation. After separation, the oil-rich produced fluid and the low oil-containing sewage are branched in the flow state conversion tee device 150. The oil-rich produced fluid is lifted to the ground through the first outlet of the flow state conversion tee device 150 and the lifting oil pipe 160; the low oil-containing sewage passes through the second outlet of the flow state conversion tee device 150 and passes through the nano-film working barrel 180 in the reinjection pipe 140. The water phase smoothly enters the hydrophilic and oleophobic net membrane and is reinjected into the water injection layer through the reinjection pipe 140 and the perforated whipstock 130; the oil phase cannot enter the nano-film working barrel 180 and enters the upper lifting oil pipe 160 through the flow state conversion tee device 150 and is lifted to the ground.

[0032] In another embodiment, the piezoelectric element 172 is electrically connected to the ground controller 174 through a signal cable 175.

[0033] In another embodiment, above the flow state conversion tee device 150, a cable packer 220 is provided on the outer periphery of the lifting oil pipe 160.

[0034] In another embodiment, the nano-film working barrel 180 includes: a support barrel, which is in a cylindrical barrel structure and has an opening at the lower end; sieve holes are evenly distributed on the outer peripheral wall of the support barrel, and the lower end of the support barrel is adapted to the step provided in the reinjection pipe, and the support barrel is set in the reinjection pipe;

[0035] The hydrophilic and oleophobic mesh membrane has a cylindrical tubular structure and is sleeved on the outer periphery of the support cylinder. It is used for allowing the water phase in the low oil-containing sewage from the first outlet to pass through. The oil phase in the low oil-containing sewage enters the lifting oil pipe through the first outlet and the second outlet in sequence and is lifted to the ground.

[0036] In another embodiment, a fishing head 183 is provided at the upper end of the nanofilm working barrel 180.

[0037] In another embodiment, a power amplifier and a signal source are provided in the ground controller 174.

[0038] In summary, the ultrasonic coalescence nanofilm and the downhole hydrocyclone oil-water separation combined pipe string 1 of the present invention are provided with an oil pipe 110, a steering and shunting assembly 120, a perforated whipstock 130, a reinjection pipe 140, a flow state conversion tee device 150, a hydrocyclone 171, a piezoelectric element 172, an electric submersible pump 173, and a nanofilm working barrel 180, and have a good oil-water separation effect.

[0039] Although the embodiments of the present invention have been disclosed as above, they are not limited to only the applications listed in the description and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. An ultrasonic polymerization nano-membrane and downhole hydrocyclone oil-water separation combined string, characterized in that: include: The oil pipe is arranged in the casing; an insert seal matching the stratified packer at the lower end of the water injection layer in the casing is arranged at the lower part of the oil pipe; a positioning insert seal matching the stratified packer at the upper end of the water injection layer in the casing is arranged at the upper part of the oil pipe; A steering flow diversion assembly and a perforated inclination guide are respectively arranged on the oil pipe and are respectively located above and below the positioning insert seal; a first channel and a second channel are arranged in the steering flow diversion assembly; the lower end of the first channel is communicated with the oil pipe below the positioning insert seal; the upper end of the first channel is communicated with the annular space between the oil pipe and the casing above the positioning insert seal; the lower end of the second channel is communicated with the perforated inclination guide; the upper end of the second channel is communicated with the oil pipe above the positioning insert seal; the perforated inclination guide is communicated with the annular space between the oil pipe and the casing below the positioning insert seal; A re-injection pipe, the lower end of which is connected to the upper end of the oil pipe; A flow state conversion three-way device is arranged above the reinjection pipe, and an inlet and a first outlet and a second outlet respectively connected to the inlet are arranged in the flow state conversion three-way device; the first outlet is arranged downward, the second outlet is arranged upward, and the first outlet and the second outlet are connected; the first outlet is connected to the upper end of the reinjection pipe; the second outlet is connected to the lifting oil pipe; The hydrocyclone, the piezoelectric element and the electric submersible pump are arranged in sequence from top to bottom. The upper end of the hydrocyclone is connected to the inlet; the electric submersible pump is used to pressurize and lift the formation fluid; the piezoelectric element is electrically connected to the surface controller and is used to aggregate micron-sized oil droplets in the formation fluid into large oil droplets; the hydrocyclone is used to separate oil and water, and the formation fluid is divided into oil-rich fluid and low-oil wastewater; The nano-membrane working cylinder is sealed at the upper part of the reinjection pipe. The nano-membrane working cylinder only allows the water phase in the low-oil-content wastewater from the first outlet to pass through and be reinjected into the water injection layer along the reinjection pipe; the oil phase in the low-oil-content wastewater cannot pass through the nano-membrane working cylinder and enters the lifting oil pipe through the second outlet.

2. The ultrasonic nano-polymerization membrane and downhole hydrocyclone oil-water separation combined string according to claim 1 is characterized by: The piezoelectric element is electrically connected to a ground controller via a signal cable.

3. The ultrasonic polymerization nano-membrane and downhole hydrocyclone oil-water separation combined string according to claim 2 is characterized by: Above the flow state conversion tee device, a cable packer is provided on the outer periphery of the lifting oil pipe.

4. The ultrasonic polymerization nano-membrane and downhole hydrocyclone oil-water separation combined string according to claim 1 or 2, characterized in that: The nano-membrane working cylinder comprises: The support tube is a cylindrical tube structure with an opening at the lower end; sieve holes are evenly distributed on the outer peripheral wall of the support tube, the lower end of the support tube is adapted to the step arranged in the reinjection pipe, and the support tube is sealed in the reinjection pipe; The hydrophilic and oleophobic mesh membrane is in a cylindrical tubular structure and is sleeved on the outer circumference of the support tube for allowing the water phase in the low-oil-content wastewater from the first outlet to pass through. The oil phase in the low-oil-content wastewater enters the lifting pipe through the first outlet and the second outlet in turn and is lifted to the ground.

5. The ultrasonic polymerization nano-membrane and downhole hydrocyclone oil-water separation combined string according to claim 4 is characterized by: A fishing head is arranged at the upper end of the nano-membrane working cylinder.

6. The ultrasonic polymerization nano-membrane and downhole hydrocyclone oil-water separation combined string according to claim 4 is characterized by: A power amplifier and a signal source are arranged in the ground controller.

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