Wellhead processing device for output of carbon dioxide flooding oil well

Abstract

The present invention discloses a wellhead processing device for the output of a carbon dioxide driven oil well, which comprises: a tank body, a first partition, a second partition, an inlet pipeline, a liquid collecting pipe, a sewage pipe, a dosing pipe, a first hole and a first top cover. The first partition and the second partition are arranged inside the tank body; the inlet pipeline, the liquid collecting pipe and the sewage pipe are arranged at the front end of the tank body; the dosing pipe and the first hole are arranged on the upper surface of the tank body; and the first top cover is arranged on the first hole. The first partition and the front end of the tank body constitute an inlet dissolution bin; the first partition and the second partition constitute a transition mixing bin inside the tank body; the second partition and the rear end of the tank body constitute a gas recovery chamber. The liquid, gas and solid of the output are separated and processed separately through the inlet dissolution bin, the transition mixing bin, the gas recovery bin and the dosing pipe. The resource utilization rate is improved, the environment is protected, the harm to the staff is reduced, and the damage to the gathering and transportation equipment is reduced.

Description

Technical Field

[0001] The invention relates to the field of petroleum exploitation, and in particular to a wellhead processing device for output of a carbon dioxide driven oil well. Background Art

[0002] With the continuous exploitation of oil, how to increase oil well production and improve recovery rate has received more and more attention. Carbon dioxide flooding is one of the important production-increasing measures to increase oil well production and improve recovery rate in oil production. Carbon dioxide flooding is generally divided into four stages: injection, well blocking, depressurization, and oil production. The depressurization stage is to release the high-pressure gas in the well to meet the transition stage of normal production. In order to improve the effectiveness of the measures, the pressure in the well needs to be released slowly and in a controlled manner until the normal production conditions of the oil well are met before the well can be opened to enter the oil production stage. Therefore, designing a wellhead processing device for the output of a carbon dioxide flooding well with a good depressurization process has become a concern in the field of oil production.

[0003] At present, there are three commonly used treatment processes in the pressure release stage: the first is the venting and discharge method, which connects the pressure relief pipeline from the wellhead to the ground oil pool for venting, and the wellhead output is directly discharged to the ground and the air; the second is the open tank method, which places an open tank at the well site, connects the pressure relief pipeline from the wellhead to the open tank, and the gas evaporates into the air, and the liquid output such as crude oil is taken away and discharged by vehicles; the third is the closed transportation method, which enters the ground gathering and transportation pipeline network from the wellhead for closed transportation without venting or discharging.

[0004] The related technology has at least the following problems:

[0005] Venting or discharging into open tanks pollutes the environment, harmful gases endanger personnel safety, and waste resources. When transporting in a closed manner, carbon dioxide generates carbonic acid when it meets water, which corrodes the gathering and transportation network and causes disorder in the gathering and transportation system. Summary of the invention

[0006] The embodiment of the present invention provides a wellhead processing device for the output of a carbon dioxide flooding oil well to solve the problems of related technologies wasting resources, polluting the environment, and harming the human body. The technical solution is as follows:

[0007] A wellhead processing device for the output of a carbon dioxide driven oil well comprises: a tank body 1, a first baffle 2, a second baffle 3, an inlet pipeline 4, a liquid collecting pipe 5, a sewage pipe 6, a drug adding pipe 7, a first hole 8 and a first top cover 9.

[0008] The first baffle 2 and the second baffle 3 are arranged inside the tank body 1; the inlet pipeline 4, the liquid collecting pipe 5 and the sewage pipe 6 are arranged at the front end of the tank body 1; the dosing pipe 7 and the first hole 8 are arranged on the upper surface of the tank body 1; the first top cover 9 is arranged on the first hole 8;

[0009] The first baffle 2 is provided with a preset number of liquid flow channels at the lower end; the second baffle 3 is provided with a preset number of vent holes at the upper end. The first baffle 2 and the front end of the tank body 1 form an inlet dissolution chamber; the first baffle 2 and the second baffle 3 form a transition mixing chamber inside the tank body 1; the second baffle 3 and the rear end of the tank body 1 form a gas recovery chamber.

[0010] Optionally, the first top cover 9 is an oil deflector cap.

[0011] Optionally, the carbon dioxide flooding oil well output wellhead processing device further includes a screen pipe 10.

[0012] A sieve tube clamp is disposed at one end of the sieve tube 10 , and the sieve tube 10 is connected to one end of the inlet pipeline 4 via the sieve tube clamp.

[0013] Optionally, the CO2 flooding oil well output wellhead processing device further includes a heating pipe 11;

[0014] The two ends of the heating tube 11 are provided with heating tube quick connectors; the heating tube 11 passes through the first partition plate 2 and the second partition plate 3 and is connected to the front end of the tank body 1 .

[0015] Optionally, the CO2 flooding oil well output wellhead processing device further includes a liquid level meter 12;

[0016] The liquid level meter 12 is arranged on the rear end outer wall of the tank body 1 .

[0017] Optionally, the CO2 flooding oil well output wellhead processing device further includes a level gauge guard plate 13;

[0018] The liquid level gauge guard plate 13 is arranged on the rear end outer wall of the tank body 1 .

[0019] Optionally, the CO2 flooding oil well output wellhead processing device further includes a first ladder 14;

[0020] One end of the first ladder 14 is connected to one end of the first hole 8 , and the other end of the first ladder 14 is connected to the bottom of the tank body 1 .

[0021] Optionally, the CO2 flooding well output wellhead processing device further includes a second hole 15, a second top cover 16 and a second ladder 17;

[0022] The second hole 15 is provided at the top of the tank body 1 , one end of the second hole 15 is connected to the second top cover 16 , the other end of the second hole 15 is connected to one end of the second ladder 17 , and the other end of the second ladder 17 is connected to the bottom of the tank body 1 .

[0023] Optionally, the CO2 flooding oil well output wellhead processing device further includes a third hole 18, a third top cover 19 and a third ladder 20;

[0024] The third hole 18 is provided at the top of the tank body 1 , one end of the third hole 18 is connected to the third top cover 19 , the other end of the third hole 18 is connected to one end of the third ladder 20 , and the other end of the third ladder 20 is connected to the bottom of the tank body 1 .

[0025] Optionally, the carbon dioxide flooding oil well output wellhead processing device further includes a base 21;

[0026] The base 21 is connected to the bottom of the tank body 1 , and a preset number of hanging legs are disposed at the lower end of the base 21 .

[0027] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0028] The output is introduced into the tank through the liquid inlet pipeline, and through the inlet dissolution tank between the first partition and the tank, the transition mixing tank between the first partition and the second partition, the gas recovery tank between the second partition and the tank, and the liquid introduced into the dosing pipe, the output of the carbon dioxide flooding well is separated into liquid, gas and solid. The gas is discharged to a special recovery device through the oil baffle cap; the liquid enters the gathering and transportation network through the liquid collection pipe; the solid matter is discharged through the sewage pipe and transported to the designated location for treatment. It improves resource utilization, protects the environment, reduces harm to workers, and reduces damage to gathering and transportation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a schematic structural diagram of a wellhead processing device for output of a carbon dioxide flooding oil well provided by an embodiment of the present invention;

[0031] Figure 2 is a schematic structural diagram of a first partition provided by an embodiment of the present invention;

[0032] Figure 3 is a schematic structural diagram of a second partition provided by an embodiment of the present invention;

[0033] Figure 4 This is a schematic structural diagram of a wellhead processing device for output of a carbon dioxide flooding oil well provided by an embodiment of the present invention;

[0034] Figure 5 This is a schematic structural diagram of a wellhead processing device for output of a carbon dioxide flooding oil well provided by an embodiment of the present invention;

[0035] Figure 6 is a schematic diagram of the screen tube structure provided by an embodiment of the present invention;

[0036] Figure 7 This is a schematic structural diagram of a wellhead processing device for output of a carbon dioxide flooding oil well provided by an embodiment of the present invention;

[0037] Figure 8 This is a schematic structural diagram of a wellhead processing device for output of a carbon dioxide flooding oil well provided by an embodiment of the present invention;

[0038] Fig. 9 This is a schematic structural diagram of a wellhead processing device for output of a carbon dioxide flooding oil well provided by an embodiment of the present invention;

[0039] Fig.10 This is a schematic structural diagram of a wellhead processing device for output of a carbon dioxide flooding oil well provided by an embodiment of the present invention;

[0040] Fig.11 This is a schematic structural diagram of a wellhead processing device for output of a carbon dioxide flooding oil well provided by an embodiment of the present invention;

[0041] Fig.12 This is a schematic structural diagram of a wellhead processing device for output of a carbon dioxide flooding oil well provided by an embodiment of the present invention;

[0042] Fig.13 It is a schematic structural diagram of another wellhead processing device for output of a carbon dioxide driven oil well provided in an embodiment of the present invention.

[0043] The reference numerals in the accompanying drawings are described as follows:

[0044] 1 tank body, 2 first baffle, 3 second baffle, 4 inlet pipeline, 5 liquid collecting pipe, 6 sewage pipe, 7 dosing pipe, 8 first hole, 9 first top cover, 10 screen tube, 11 heating tube, 12 liquid level gauge, 13 liquid level gauge guard plate, 14 first ladder, 15 second hole, 16 second top cover, 17 second ladder, 18 third hole, 19 third top cover, 20 third ladder, 21 base. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0046] The embodiment of the present invention provides a wellhead processing device for the output of a carbon dioxide driven oil well, see Figure 1The wellhead processing device for the output of the carbon dioxide flooding oil well includes a tank body 1, a first baffle 2, a second baffle 3, an inlet pipeline 4, a liquid collection pipe 5, a sewage pipe 6, a drug adding pipe 7, a first hole 8 and a first top cover 9.

[0047] The first baffle 2 and the second baffle 3 are arranged inside the tank body 1; the inlet pipeline 4, the liquid collecting pipe 5 and the sewage pipe 6 are arranged at the front end of the tank body 1; the dosing pipe 7 and the first hole 8 are arranged on the upper surface of the tank body 1; the first top cover 9 is arranged on the first hole 8;

[0048] The first baffle 2 has a preset number of liquid flow channels at its lower end, and the second baffle 3 has a preset number of vent holes at its upper end. The first baffle 2 and the front end of the tank body 1 form an inlet dissolution chamber; the first baffle 2 and the second baffle 3 form a transition mixing chamber inside the tank body 1; and the second baffle 3 and the rear end of the tank body 1 form a gas recovery chamber.

[0049] Optionally, the first partition 2 is arranged inside the tank 1, see Figure 2 The first partition 2 is vertically welded to the bottom of the tank body 1. The first partition 2 is provided with a preset number of liquid flow channels from the bottom to the top, wherein the preset number is 4 or 6, which is not limited in the embodiment of the present invention. The distance between the top surface of the first partition 2 and the top of the tank body 1 is a preset value. The first partition 2 and the front end of the tank body 1 form an inlet dissolution tank.

[0050] See also Figure 3 The second partition 3 is arranged inside the tank body 1, and the second partition 3 is vertically welded to the top of the tank body 1. A preset number of vent holes is arranged on the upper part of the second partition 3, wherein the preset number is 4 or 6, which is not limited in the embodiment of the present invention. The distance between the bottom surface of the second partition 3 and the bottom of the tank body 1 is a preset value. The first partition 2, the second partition 3 and the tank body 1 constitute a transition mixing bin.

[0051] The inlet pipeline 4 passes through the front end of the tank body 1 and is sealed and welded to the tank body 1. The end of the inlet pipeline 4 located outside the tank body 1 is connected to the inlet valve. The liquid collecting pipe 5 passes through the bottom of the front end of the tank body 1 and is sealed and welded to the tank body 1. The length of the liquid collecting pipe 5 entering the interior of the tank body 1 is a preset value. The end of the liquid collecting pipe 5 located outside the tank body 1 is connected to the liquid collecting valve. One end of the sewage pipe 6 is welded and sealed to the bottom of the front end of the tank body 1. The sewage pipe 6 is connected to the interior of the tank body 1, and the other end of the sewage pipe 6 is connected to the sewage valve. The dosing pipe 7 passes through the top of the front end of the tank body 1 and is sealed and welded to the tank body 1. The distance from the end of the dosing pipe 7 entering the tank body 1 to the bottom of the tank is a preset value. The end of the dosing pipe 7 located outside the tank body 1 is connected to the dosing valve. The first hole 8 is a short tube body. One end of the first hole 8 is sealed and welded to the top of the rear end of the tank body 1. The first hole 8 is connected to the tank body 1, and the other end of the first hole 8 is detachably connected to the first top cover 9. The second partition 3 and the rear end of the tank body 1 form a gas recovery cabin.

[0052] The output of the carbon dioxide flooding well enters the inlet dissolution tank inside the tank body 1 through the inlet pipeline 4, and the treatment liquid is added through the dosing pipe 7 to react with the output of the carbon dioxide flooding well. The solid matter falls to the bottom of the tank body 1, and the liquid matter enters the transition mixing tank through the liquid flow channel of the first partition 2. The gaseous matter enters the gas recovery cabin through the vent hole of the second partition 3, and the gas is discharged through the first hole 8. The liquid is recovered through the liquid collection pipe 5, and the waste is discharged from the tank body 1 through the sewage pipe 6.

[0053] The sealed tank body prevents harmful gases in the output of the carbon dioxide flooding well from volatilizing into the air, protects the environment, and reduces harm to workers. The treatment liquid is added to the tank body through the dosing pipe to react with the output of the carbon dioxide flooding well to separate solid, liquid and gas, and the harmless gas is discharged from the tank body through the first hole. The liquid resources are recovered and transported to the gathering and transportation network through the liquid collection pipe, and the waste is discharged from the tank body through the sewage pipe and transported to the designated location for treatment, saving resources and reducing damage to the gathering and transportation equipment.

[0054] See also Figure 4 In an optional embodiment, the first top cover 9 is an oil deflector cap.

[0055] The oil retaining cap is detachably and sealingly connected to the first hole 8 .

[0056] See also Figure 5 In an optional embodiment, the wellhead processing device for the output of the carbon dioxide driven oil well further includes a screen 10.

[0057] A sieve tube clamp is provided at one end of the sieve tube 10 , and the sieve tube 10 is connected to one end of the inlet pipeline 4 through the sieve tube clamp.

[0058] See also Figure 6 Optionally, the screen tube 10 is a regularly arranged porous tubular structure, and multiple tubes are connected in parallel; wherein the size of the pores is gradually expanded along the length direction from the inlet; a screen tube clamp is provided at one end of the screen tube 10, and the screen tube 10 is detachably connected to one end of the inlet pipeline 4 through the screen tube clamp. The screen tube 10 is laid flat on the bottom of the inlet dissolution bin inside the tank body 1.

[0059] See also Figure 7 In an optional embodiment, the carbon dioxide drive oil well output wellhead processing device further includes a heating pipe 11.

[0060] Heating tube quick connectors are provided at both ends of the heating tube 11 ; the heating tube 11 passes through the first partition plate 2 and the second partition plate 3 and is connected to the front end of the tank body 1 .

[0061] Optionally, the heating tube 11 is configured as a U-shaped tube; the heating tube 11 passes through the first partition 2 and the second partition 3 and is supported by the first partition 2 and the second partition 3, the two ends of the heating tube pass through the front end of the tank body 1 and are sealed and welded to the tank body 1, and the two ends of the heating tube 1 are provided with heating tube quick connectors. And the heating tube 11 is configured with a low inlet and a high outlet in the tank body 1.

[0062] See also Figure 8 In an optional embodiment, the carbon dioxide drive oil well output wellhead processing device also includes a liquid level meter 12.

[0063] The liquid level meter 12 is arranged on the rear end outer wall of the tank body 1 .

[0064] Optionally, the liquid level meter 12 is arranged on the outer side of the rear end of the tank body 1, is connected to the tank body 1 through a through hole and is welded and sealed, and the liquid level meter 12 is vertically connected to the bottom of the tank body 1.

[0065] See also Fig. 9 , in an optional embodiment, the CO2 flooding oil well output wellhead processing device further includes a level gauge guard plate 13;

[0066] The liquid level gauge guard plate 13 is arranged on the rear end outer wall of the tank body 1 .

[0067] Optionally, the liquid level gauge guard plate 13 is a rectangular parallelepiped structure, and the liquid level gauge guard plate 13 is arranged around the liquid level gauge 12 and is welded and fixed to the outer wall of the tank body 1 .

[0068] See also Fig.10 In an optional embodiment, the carbon dioxide drive oil well output wellhead processing device also includes a first ladder 14.

[0069] The first human ladder 14 is arranged at the lower part of the first hole 8 , and both ends of the first human ladder 14 are respectively welded to the first hole 8 and the bottom of the tank body 1 , and are kept vertical to the bottom of the tank body 1 .

[0070] See also Fig.11 In an optional embodiment, the wellhead processing device for the output of the carbon dioxide driven oil well further includes a second hole 15 , a second top cover 16 and a second ladder 17 .

[0071] The second hole 15 is provided at the top of the tank body 1 , one end of the second hole 15 is connected to the second top cover 16 , the other end of the second hole 15 is connected to one end of a second ladder 17 , and the other end of the second ladder 17 is connected to the bottom of the tank body 1 .

[0072] Optionally, the second hole 15 is arranged at the top of the tank body 1 between the first partition 2 and the second partition 3, the second hole 15 is detachably and sealedly connected to the first top cover 16, the second human ladder 17 is arranged at the lower part of the second hole 15, and the two ends of the second human ladder 17 are respectively welded to the second hole 15 and the bottom of the tank body 1, and the second human ladder 17 remains vertical to the bottom of the tank body 1.

[0073] See also Fig.12 In an optional embodiment, the carbon dioxide drive oil well output wellhead processing device further includes a third hole 18 , a third top cover 19 and a third ladder 20 .

[0074] The third hole 18 is provided at the top of the tank body 1 , one end of the third hole 18 is connected to the third top cover 19 , the other end of the third hole 18 is connected to one end of a third ladder 20 , and the other end of the third ladder 20 is connected to the bottom of the tank body 1 .

[0075] Optionally, the third hole 18 is arranged at the top of the inlet dissolution bin at the front end of the tank body 1, the third hole 18 is adjacent to the dosing pipe 7, the third hole 18 is detachably and sealedly connected to the second top cover 19, the third human ladder 20 is arranged at the lower part of the third hole 18, the two ends of the third human ladder 20 are respectively welded to the third hole 18 and the bottom of the tank body 1, and the third human ladder 20 remains vertical to the bottom of the tank body 1.

[0076] See also Fig.13 In an optional embodiment, the CO2 flooding oil well output wellhead processing device further includes a base 21 .

[0077] The base 21 is welded to the bottom of the tank body 1, and a preset number of hanging legs are symmetrically welded to the outer bottom of the base 21. The preset number is 4 or 6, which is not limited in the embodiment of the present invention.

[0078] In an optional embodiment, the first partition 2 and the second partition 3 are welded to the tank body 1 inside the tank body 1 and the top surface of the first partition 2 is 300 mm away from the top of the tank body 1, and the first partition is provided with 3-5 liquid flow channels with a width of 90-120 mm and a height of 200-300 mm from the bottom to the top; the bottom of the second partition 3 is 300 mm away from the bottom of the tank body 1, and the second partition 3 is 150 mm away from the top of the tank body 1, and 3-9 ventilation holes with a diameter of 50 mm are evenly arranged on the second partition 3 as air flow channels.

[0079] The inlet pipeline 4 is a U-shaped steel pipe with a diameter of 73 mm. The U-shaped inlet pipeline 4 passes through the front end of the tank body 1 and is suspended in the middle and upper part of the tank body. The inlet pipeline 4 is welded and sealed with the tank body 1. The part of the inlet pipeline 4 entering the tank body 1 is 300 mm away from the bottom of the tank. The inlet pipeline 4 is located inside the tank body 1 and is connected to the screen pipe 10 through a screen pipe clamp. The inlet pipeline 4 is located at the external port of the tank body 1 and is connected to the inlet valve. The screen pipe 10 is a porous tubular structure. Each screen pipe 10 is 2 meters long and 6-18 round holes are evenly staggered on the screen pipe 10, and the diameter of the round holes varies from 2 to 15 mm. The liquid receiving pipe 5 is a seamless steel pipe with a diameter of 80 mm. The liquid receiving pipe 5 is 300 mm away from the bottom of the tank. The liquid receiving pipe 5 enters the inlet dissolving tank 300-500 mm. The liquid receiving pipe 5 is sealed and welded with the tank body 1. The liquid receiving pipe 5 is located at the internal port of the tank body 1 and a filter screen structure is set. The other end of the liquid receiving pipe 5 is connected to the gathering and transportation network pipe through a liquid receiving valve. One end of the sewage pipe 6 is sealed and welded to the bottom of the front end of the tank body 1 and the sewage pipe 6 is connected to the tank body 1, and the other end of the sewage pipe 6 is connected to the sewage valve. The dosing pipe 7 is a stainless steel pipe with a diameter of 32 mm. The dosing pipe 7 is vertically arranged at the bottom of the tank body 1. The upper end of the dosing pipe 7 passes through the top of the tank body 1 and is connected to the drug supply device through the dosing valve, and is welded and sealed to the tank body 1.

[0080] The first hole 8 is set at the rear end of the top of the tank body 1. The diameter of the first hole 8 is 600-800mm. The upper part of the first hole 8 is a flange structure connected to the first top cover 9 flange. The first ladder 14 is made of angle steels on both sides and multiple 16mm diameter steel bars in the middle, which are welded at equal distances. The first ladder 14 is set at the lower part of the first hole 8 and is welded and fixed to the bottom of the tank. The heating pipe 11 is a seamless steel pipe. The heating pipe 11 passes through the first partition 2 and the second partition 3 and is supported by the first partition 2 and the second partition 3. The inlet and outlet of the heating pipe 11 pass through the front end tank wall of the tank body 1 and are sealed and welded. The two ends of the heating pipe 11 are connected to the heating equipment through quick connectors.

[0081] The liquid level gauge 12 is arranged on the outside of the rear end of the tank body 1, and is connected to the tank body 1 by a through hole and sealed and welded. The liquid level gauge guard plate 13 is arranged around the liquid level gauge 12 and welded to the tank body 1. The second hole 15 is arranged on the top of the transition mixing bin, the diameter of the second hole 15 is 600-800mm, the upper part of the second hole 15 is a flange structure connected to the second top cover 16 flange, the second ladder 17 is made by welding the angle steels on both sides and multiple 16mm diameter steel bars in the middle at equal distances, the second ladder 17 is arranged at the lower part of the second hole 15, and is welded and fixed to the tank bottom. The third hole 18 is arranged on the top of the inlet dissolution bin at the front end of the tank body 1, the diameter of the third hole 18 is 600-800mm, the upper part of the third hole 18 is a flange structure connected to the third top cover 19 flange, the third ladder 20 is made by welding the angle steels on both sides and multiple 16mm diameter steel bars in the middle at equal distances, the third ladder 20 is arranged at the lower part of the third hole 18, and is welded and fixed to the tank bottom. The base 21 is welded to the bottom of the tank body 1 , and four hanging legs are arranged on the base 21 .

[0082] In the specific operation, step 1: hoisting. Transport the wellhead processing device of the CO2 flooding oil well output to the well site, place it 15 meters away from the wellhead of the CO2 flooding oil well, in the downwind direction of the local seasonal wind, and connect the ground wire;

[0083] Step 2: Check. Check and confirm that the inlet valve, dosing valve, liquid collection valve, and sewage valve are flexible and easy to use and closed; check and confirm that the first hole 8 and the first top cover 9 are sealed; check and confirm that the liquid level meter 12 is flexible and accurate; check and confirm that the tank body 1 and all parts are normal.

[0084] Step 3: Connect the pipeline. Install a 1-5mm oil nozzle in the wellhead insulation sleeve; connect the inlet pipeline 4, open the inlet valve, add clean water to the tank 1, and the liquid level gauge 12 shows that the liquid level reaches 400-600mm, submerging the screen tube 10 by no less than 300mm. Prepare the materials for processing medicines, connect the dosing pipe 7; connect the dosing pump and the drug supply equipment through the dosing valve.

[0085] Step 4: Open the well and release the pressure. Open the well and release the pressure according to the opening procedure. The output of the carbon dioxide flooding oil well enters the inlet dissolution tank through the oil nozzle, wellhead insulation sleeve, inlet pipeline 4, inlet valve, and screen tube 10. After the gas output passes through the screen tube 10, a large number of fine bubbles are generated in the water, which are fully mixed with water to form hydrates and mixed gases; the gas enters the transition mixing tank along the first partition 2, enters the gas recovery tank through the air flow channel of the second partition 3, and is discharged through the oil baffle cap along the first hole 8 (or recovered by the gas collector). The liquid enters the transition mixing zone along the lower connecting hole of the first partition 2, and enters the gas recovery tank through the lower part of the second partition 3. Under the action of buoyancy, the crude oil floats up and the solid matter sinks to the bottom of the tank. When the output contains acidic corrosive substances, it dissolves in clean water to form an acidic solution. When the pH is lower than 6, the treatment liquid is prepared according to the formula, the dosing valve is opened, the dosing pump is started, and the liquid is added to the tank body 1 to keep the pH value of the liquid in the tank body 1 between 7 and 8. When the liquid level exceeds 2 / 3 of the volume, open the liquid collection valve, start the liquid collection pump, and collect the liquid into the collection and transportation process or transport it for processing. When the crude oil solidifies and cannot be collected normally, connect the heating equipment and connect the heating pipe 11 through the heating pipe quick connector to heat the liquid in the tank body 1. After it is dissolved, start the liquid collection process to recover the liquid. The solid waste and solid products of the acid-base reaction generated during the process are deposited to the bottom of the tank body 1 by gravity.

[0086] Step 5: Finishing and cleaning the tank. When the pressure release stage is over, close the inlet valve and disassemble the inlet pipeline 4. Open the liquid collection valve, start the liquid collection pump, and collect the liquid into the collection process or transportation through the liquid collection pipe 5. Remove the oil cap on the first hole 8, remove the second top cover 16 bolts on the second hole 15, remove the top cover, remove the third top cover 19 bolts on the third hole 18, remove the top cover, and input air into the internal space of the tank body 1. After detecting that there is no toxic or harmful gas, check the solid waste at the bottom of the tank and remove it.

[0087] Step 6: Recover the device. After using the wellhead processing device for the output of the carbon dioxide flooding oil well, remove all the connecting accessories, check the nozzles, coils, and threads of all the connecting parts, and after confirming that they are intact, apply oil protection and recover them for use.

[0088] For example, a CO2 flooding oil well has a wellhead tubing pressure of 18MPa and a casing pressure of 20MPa before depressurization. The well depth is 2998m. A φ38 tubular pump is lowered and the pump hanging depth is 2008m. The CO2 flooding oil well output wellhead processing device is used to depressurize the CO2 flooding oil well. The steps are as follows:

[0089] Step 1: Hoisting. First, transport the CO2 flooding well output wellhead processing device to the well site and place it 25 meters away from the wellhead, at the downwind position of the local seasonal wind, using a crane. Connect the ground wire.

[0090] Step 2: Check the connection pipelines. Check and confirm that the inlet valve, dosing valve, liquid collection valve, and sewage valve are flexible and easy to use and closed; check and confirm that the first hole 8 and the first top cover 9 are sealed; check and confirm that the liquid level gauge 12 is flexible and accurate; check and confirm that the tank body 1 and all parts are normal. Add clean water into the tank body 1, and the liquid level gauge 12 shows a liquid level of 600mm, which submerges the screen tube 10 by about 450mm.

[0091] Step 3: Open the well and release the pressure. First, install a 3mm oil nozzle from the tubing insulation sleeve, and connect the pipeline through the inlet valve, inlet pipeline 4, and screen pipe 10 of the CO2 flooding well output wellhead processing device to enter the inlet dissolution tank of the tank body 1. After 4 hours of pressure release, the liquid level gauge 12 shows that the liquid level has risen by 300mm, which is equivalent to about 5.5 tons of liquid. The pH value of the sampled liquid is between 5 and 6. The gas is discharged from the oil cap on the top of the gas recovery tank, and there is a corrosive acid smell around.

[0092] Step 4: Collect liquid. Prepare the treatment liquid according to the formula in the dosing device, open the dosing valve, start the dosing pump, and add the treatment liquid to the tank 1. After one hour, the pH value is detected to be between 7 and 8, and the gas discharged from the oil cap on the top of the gas recovery bin has no obvious corrosive acid smell. After 24 hours of depressurization, the liquid level gauge 12 shows that the liquid level has risen by 1.8 meters, exceeding 2 / 3 of the volume of the tank 1. Sampling and testing show that the substances contained in the liquid in the tank 1 do not affect the normal production of the gathering and transportation system. Then connect the liquid collection pipeline and the liquid collection pump through the liquid collection valve and liquid collection pipe 5 set on the tank 1, and recover about 18 cubic meters of output to the gathering and transportation system through the oil well production process. After 6 hours of observation, the gathering and transportation system is producing normally. Continue to use the above method and procedure to release pressure. The oil pipe is depressurized for 13 days and the casing is depressurized for 11 days. During this period, the depressurization pipeline is not blocked again. When the tubing pressure drops to 0.8MPa and the casing pressure drops to 0.9MPa, the pressure relief is stopped and the pressure relief phase of the well ends. After closing the inlet valve, the pressure relief pipeline and the insulation sleeve nozzle are disassembled and the well is opened for normal production.

[0093] Step 5: Finishing and cleaning the tank. Remove the oil cap on the top of the first hole 8, remove the top cover bolts on the second hole 15, remove the second top cover 16, remove the top cover bolts on the third hole 18, remove the third top cover 19, input air into the internal space of the tank body 1, and after testing for the absence of toxic and harmful gases, check the bottom of the tank. There is 200mm of viscous liquid left in the lower part of the tank body 1, and about 50mm of solid waste at the bottom. Then connect the recycling facilities outside the sewage valve, open the sewage valve, and transport the above substances through the sewage outlet for disposal by professional departments.

[0094] Step 6: Recover the device. Check that all parts are intact, and that the threads and bolts of the connecting parts are complete and maintained, then pull it back to the mine for storage.

[0095] For another example, a CO2 flooding oil well, before depressurization, has a wellhead tubing pressure of 11MPa, a casing pressure of 15MPa, a well depth of 2668m, a φ44 flexible metal pump is lowered, and the pump hanging depth is 1880m. The CO2 flooding oil well output wellhead processing device is used to depressurize the CO2 flooding oil well. The steps are as follows:

[0096] Step 1: Hoisting. First, the CO2 flooding well output wellhead processing device is transported to the well site by truck and placed by crane 18 meters away from the wellhead, at the downwind position of the local seasonal wind. The ground wire is connected.

[0097] Step 2: Check the connection pipeline. Then assemble and check. Check that the inlet valve is flexible and easy to use and closed; check that the dosing valve is flexible and easy to use and closed; check that the liquid collection valve is flexible and easy to use and closed; check that the sewage valve is flexible and easy to use and closed; check that the first hole 8 and the first top cover 9 are sealed; check that the liquid level gauge 12 is flexible and accurate; check that the tank body 1 and all parts are normal; add clean water into the tank body 1, and the liquid level gauge 12 shows a liquid level of 650mm, which submerges the screen tube 10 by about 500mm.

[0098] Step 3: Open the well and release the pressure. First, install a 3mm oil nozzle from the tubing insulation sleeve, and connect the pipeline through the inlet valve, inlet pipeline 4, and screen pipe 10 of the CO2 flooding well output wellhead processing device to enter the inlet dissolution tank of the tank body 1. After 10 hours of pressure release, the liquid level gauge 12 shows that the liquid level has risen by 400mm, which is equivalent to about 6.5 tons of liquid. The pH value of the sampled liquid is below 5, and the gas is discharged from the oil cap on the top of the gas recovery tank. There is a corrosive acid smell around.

[0099] Step 4: Collect liquid. Prepare the treatment liquid according to the formula in the dosing device, open the dosing valve, start the dosing pump, and add the treatment liquid to the tank 1. After one hour, the pH value is detected to be between 6 and 7. After two hours, the pH value is detected to be between 7 and 8. The gas discharged from the oil cap on the top of the gas recovery bin has no obvious corrosive acid smell. After 48 hours of depressurization, the liquid level gauge 12 shows that the liquid level has risen by 1.6 meters, exceeding 2 / 3 of the volume of the tank 1. Sampling and testing show that the substances contained in the liquid in the tank 1 do not affect the normal production of the gathering and transportation system. Then connect the liquid collection pipeline and the liquid collection pump through the liquid collection valve and liquid collection pipe 5 set on the tank 1, and recover about 15 cubic meters of output to the gathering and transportation system through the oil well production process. After 4 hours of observation, the gathering and transportation system is producing normally. Continue to use the above method and procedure to release pressure. The oil pipe is depressurized for 15 days and the casing is depressurized for 8 days. During this period, the depressurization pipeline is not blocked. When the tubing pressure drops to 0.5MPa and the casing pressure drops to 1.0MPa, stop depressurizing and the well ends the depressurization stage. After closing the inlet valve, disassemble the depressurization pipeline and the insulation sleeve nozzle, and start normal production.

[0100] Step 5: Finishing and cleaning the tank. Remove the oil cap on the top of the first hole 8, remove the top cover bolts on the second hole 15, remove the second top cover 16, remove the top cover bolts on the third hole 18, remove the third top cover 19, input air into the internal space of the tank body 1, and after testing for the absence of toxic and harmful gases, check the bottom of the tank. There is 100mm of viscous liquid left in the lower part of the tank body 1, and about 20mm of solid waste at the bottom. Then connect the recycling facilities outside the sewage valve, open the sewage valve, and transport the above substances through the sewage outlet for disposal by professional departments.

[0101] Step 6: Recover the device. Check that all parts are intact, and that the threads and bolts of the connecting parts are complete and maintained, then pull it back to the mine for storage.

[0102] The working principle of the wellhead processing device for the output of a carbon dioxide flooding oil well provided in the embodiment of the present invention is as follows:

[0103] The output of the carbon dioxide flooding well enters the inlet dissolution chamber inside the tank body 1 through the inlet pipeline 4 and the screen tube 10 connected thereto, and the treatment liquid is added through the dosing pipe 7 to react with the output of the carbon dioxide flooding well. The solid matter falls to the bottom of the tank body 1, the liquid matter enters the transition mixing chamber through the liquid flow channel of the first partition 2, and the gaseous matter enters the gas recovery chamber through the vent hole of the second partition 3. The harmless gas is filtered through the oil retaining cap connected to the first hole 8 to discharge the gas from the tank body 1, the liquid is recovered through the liquid collecting pipe 5, and the waste is discharged from the tank body 1 through the sewage pipe 6. The liquid inside the tank body 1 is heated by the heating pipe 11. The liquid level in the tank body 1 can be detected by the liquid level meter 12 and the liquid level meter guard plate 13. The inside of the tank body 1 can be entered through the first hole 8, the first top cover 9, the first ladder 14, the second hole 15, the second top cover 16, the second ladder 17, the third hole 18, the third top cover 19, and the third ladder 20. The position of the tank body 1 can be moved through the base 21 and the hanging legs.

[0104] To summarize, through the combined effects of the inlet dissolution tank between the first partition and the tank body, the transition mixing tank between the first partition and the second partition, the gas recovery tank between the second partition and the tank body, and the liquid medicine introduced into the dosing pipe, the output of the carbon dioxide drive oil well is separated into liquid, gas and solid, and the harmless gas is discharged from the tank body through the oil baffle cap, which protects the environment and reduces the harm to the staff; the liquid enters the gathering and transportation network through the liquid collection pipe, which improves the resource utilization rate and reduces the damage to the gathering and transportation equipment; the solid matter is discharged through the sewage pipe and transported to the designated location for treatment, which protects the environment.

[0105] The oil cap can be used to return the oil and water carried in the gas to the inside of the tank, preventing rainwater and other foreign liquids from entering. The screen tube hole structure and side-by-side connection can prevent the local temperature from dropping too fast and causing the pipeline to freeze, and prevent the solids in the output from entering the tank. The heating pipe can prevent the tank temperature from being too low and causing the pipeline to freeze, and the heating pipe is set with a low inlet and a high outlet to avoid freezing. The volume of the output in the tank and the liquid level inside the tank can be measured by the level gauge, and the level gauge guard can be used to fix and protect the level gauge.

[0106] Through the first hole and the first ladder, the second hole and the second ladder, and the third hole and the third ladder, the device can be maintained in time, the internal parts of the tank can be replaced, and the tank bottom channel can be cleaned. The tank can be moved through the base and the hanging legs.

[0107] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present disclosure, and will not be described in detail here.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wellhead processing device for the output of a carbon dioxide flooding oil well, characterized in that: The wellhead processing device for the output of a carbon dioxide flooding oil well comprises: a tank body (1), a first baffle (2), a second baffle (3), an inlet pipeline (4), a liquid collection pipe (5), a sewage pipe (6), a drug adding pipe (7), a first hole (8), a first top cover (9), a second hole (15), a second top cover (16), a second ladder (17), a third hole (18), a third top cover (19) and a third ladder (20); The first baffle (2) and the second baffle (3) are arranged inside the tank body (1); the inlet pipeline (4), the liquid collecting pipe (5) and the sewage discharge pipe (6) are arranged at the front end of the tank body (1); the dosing pipe (7) and the first hole (8) are arranged on the upper surface of the tank body (1); the first top cover (9) is arranged on the first hole (8); The first baffle (2) is provided with a preset number of liquid flow channels at the lower end; the second baffle (3) is provided with a preset number of vent holes at the upper end; the first baffle (2) and the front end of the tank body (1) form an inlet dissolution chamber; the first baffle (2) and the second baffle (3) form a transition mixing chamber inside the tank body (1); the second baffle (3) and the rear end of the tank body (1) form a gas recovery chamber; The second hole (15) is arranged at the top of the tank body (1), one end of the second hole (15) is connected to the second top cover (16), the other end of the second hole (15) is connected to one end of the second ladder (17), and the other end of the second ladder (17) is connected to the bottom of the tank body (1); The third hole (18) is arranged at the top of the tank body (1), one end of the third hole (18) is connected to the third top cover (19), the other end of the third hole (18) is connected to one end of the third ladder (20), and the other end of the third ladder (20) is connected to the bottom of the tank body (1).

2. The wellhead processing device for the output of a carbon dioxide flooding oil well according to claim 1, characterized in that: The first top cover (9) is an oil deflector cap.

3. The wellhead processing device for the output of a carbon dioxide flooding oil well according to claim 1, characterized in that: The carbon dioxide flooding oil well output wellhead processing device further comprises a screen pipe (10); A screen tube clamp is provided at one end of the screen tube (10), and the screen tube (10) is connected to one end of the inlet pipeline (4) via the screen tube clamp.

4. The wellhead processing device for the output of a carbon dioxide flooding oil well according to claim 1, characterized in that: The carbon dioxide flooding oil well output wellhead processing device further comprises a heating pipe (11); The two ends of the heating tube (11) are provided with heating tube quick connectors; the heating tube (11) passes through the first partition plate (2) and the second partition plate (3) and is connected to the front end of the tank body (1).

5. The wellhead processing device for the output of a carbon dioxide flooding oil well according to claim 1, characterized in that: The carbon dioxide flooding oil well output wellhead processing device further comprises a liquid level meter (12); The liquid level meter (12) is arranged on the rear end outer wall of the tank body (1).

6. The wellhead processing device for the output of a carbon dioxide flooding oil well according to claim 5, characterized in that: The carbon dioxide flooding oil well output wellhead processing device further comprises a liquid level gauge guard plate (13); The liquid level gauge guard plate (13) is arranged on the rear end outer wall of the tank body (1).

7. The wellhead processing device for the output of a carbon dioxide flooding oil well according to claim 1, characterized in that: The carbon dioxide flooding oil well output wellhead processing device also includes a first ladder (14); One end of the first ladder (14) is connected to one end of the first hole (8), and the other end of the first ladder (14) is connected to the bottom of the tank body (1).

8. The wellhead processing device for the output of a carbon dioxide flooding oil well according to claim 1, characterized in that: The carbon dioxide flooding oil well output wellhead processing device further comprises a base (21); The base (21) is connected to the bottom of the tank body (1), and a preset number of hanging legs are provided at the lower end of the base (21).

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