CN112523737B - Oil well acidification process and device for improving oil and gas well yield - Google Patents
Oil well acidification process and device for improving oil and gas well yield Download PDFInfo
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- CN112523737B CN112523737B CN202011145954.3A CN202011145954A CN112523737B CN 112523737 B CN112523737 B CN 112523737B CN 202011145954 A CN202011145954 A CN 202011145954A CN 112523737 B CN112523737 B CN 112523737B
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- 230000020477 pH reduction Effects 0.000 title claims abstract description 40
- 239000003129 oil well Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 23
- 239000002253 acid Substances 0.000 claims abstract description 138
- 239000007788 liquid Substances 0.000 claims abstract description 137
- 238000002347 injection Methods 0.000 claims abstract description 62
- 239000007924 injection Substances 0.000 claims abstract description 62
- 238000003756 stirring Methods 0.000 claims abstract description 52
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 45
- 239000007789 gas Substances 0.000 claims description 30
- 238000005406 washing Methods 0.000 claims description 24
- 238000000746 purification Methods 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000872 buffer Substances 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000006386 neutralization reaction Methods 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- DUIOKRXOKLLURE-UHFFFAOYSA-N 2-octylphenol Chemical compound CCCCCCCCC1=CC=CC=C1O DUIOKRXOKLLURE-UHFFFAOYSA-N 0.000 claims description 3
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 13
- 239000003921 oil Substances 0.000 description 32
- 239000000243 solution Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000012445 acidic reagent Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
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- General Life Sciences & Earth Sciences (AREA)
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- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
An oil well acidizing process and device for improving the yield of oil and gas wells, the oil well acidizing device comprises an acid liquid tank, a stirring tank is arranged in the acid liquid tank, a stirring device is arranged in the stirring tank, an acidizing tubular column penetrating through a wellhead device and then penetrating to the bottom of a sleeve is arranged at the bottom of the sleeve, pulse supercharging devices are arranged on two sides of the acidizing tubular column above the nozzle, and a waste liquid tank connected with a liquid outlet of the wellhead device is arranged, the acidizing process comprises the following steps: s1 acidification pretreatment, S2 preposed acid liquid injection, S3 reaction acid liquid injection, S4 neutralizing agent injection, pulse pressurization injection, so that the acid liquid enters an oil layer in a fluctuating mode, the swept area is enlarged, the acid liquid injection effect is effectively enhanced, the residual acid liquid is neutralized in a well bottom subsection, the acid liquid content in the flowback liquid is reduced, the components of the preposed acid liquid, the reaction acid liquid and the neutralizing agent are optimized, the oil layer blockage can be effectively solved, and the purpose of increasing the yield is achieved.
Description
Technical Field
The invention relates to the technical field of oil well acidification production increase, in particular to an oil well acidification process and device for improving oil and gas well yield.
Background
Acidification is a means of adding an acidic reagent into an oil well to improve the yield and recovery ratio of the oil well in oil field production, and the principle of acidification is to dissolve and erode the plugs in rocks or cracks in a reservoir layer by acid liquor, recover or improve the porosity and permeability of a stratum and enhance the flowability of crude oil in the pores of the stratum.
The conventional acidification technology is divided into conventional three-stage type and continuous acidification, the conventional acidification method usually needs liquid discharge after acidification, the construction period is long, the discharged acid liquid is easy to pollute, and the continuous acidification does not need to be flowback but is easy to corrode production equipment such as a downhole tubular column and the like.
Therefore, there is a need to provide an optimized acidizing process that has a significant effect on well stimulation without affecting the environment and downhole equipment.
Disclosure of Invention
The invention provides an oil well acidification process and a device for improving the yield of an oil and gas well aiming at the existing problems.
The technical scheme of the invention is as follows: an oil well acidizing process for improving the production of oil and gas wells, comprising the steps of:
s1 acidification pretreatment: pulling out a production pipe column in the test well, putting the production pipe column into a well washing pipe column, washing the well, and pulling out the well washing pipe column after the well washing is finished;
s2 injecting a preposed acid solution: putting an acidification pipe column with a packer, enabling the packer to be positioned at the upper part of an oil layer, pressurizing the interior of the acidification pipe column to seal the packer, injecting a preposed acid solution into the acidification pipe column, enabling the preposed acid solution to be extruded into a target oil layer from an annular space between the acidification pipe column and a sleeve, and closing a well for reaction for 1-2 hours;
s3 pouring reaction acid liquid: injecting reaction acid liquor into the acidification pipe column for reacting with the preposed acid liquor to generate heat and gas, extruding the reaction acid liquor into a target oil layer from the annular space of the acidification pipe column and the sleeve and reacting with the preposed acid liquor, and closing the well for reaction for 4-6 h;
s4 injecting a neutralizing agent:
s4-1: injecting a neutralizing agent into the acidizing tubular column, wherein the neutralizing agent is used for neutralizing residual acid liquor in a target oil layer, and the injection speed is 0.1-0.3m 3 Min, injection amount 1.5m 3 Pumping the acidizing tubular column at the pressure of 10MPa, simultaneously lifting the acidizing tubular column to a certain distance from the bottom of the well, then injecting a neutralizing agent into the acidizing tubular column again at the same injection speed and injection amount until the acidizing tubular column is completely lifted out, and closing the well for reacting for 4 hours;
s4-2: opening a well, releasing a part of pressure in the sleeve, putting a production string, continuously injecting a neutralizing agent into the production string in the putting process, keeping the pump injection pressure lower than 8MPa, keeping the bottom hole pressure lower than the oil layer pressure in a negative pressure underbalance state, enabling residual acid liquid in a target oil layer to enter an annular space between the production string and the sleeve, filling the annular space with the neutralizing agent and mixed acid liquid after the production string is put to the bottom hole, and closing the well for reaction for 8 hours;
s5: and (5) opening the well, and recovering normal production of the oil well.
Further, the well washing in the acidification pretreatment of the step S1 comprises a primary forward well washing and a primary reverse well washing, and the volume of the well washing liquid is 12m 3 The well flushing liquid comprises the following components in percentage by mass: fluid loss additive: octyl phenol polyoxyethylene ether: water ═ 3.8-4.2: (1.9-2.2): (2.6-3): (90.6-91.7) for removing the scale and dead oil from the well bore and preventing well blockage.
Further, in the step S2, the pre-acid solution is injected in a pulse mode through a pulse pressurizing device, and the injection speed is 0.2-0.5m 3 Min, injection amount 25m 3 The pump injection pressure is 18MPa, the injection time and the pause time in each pulse cycle are both 1s, and the mass ratio of the components of the preposed acid liquid is as follows: fluoboric acid: corrosion inhibitor: citric acid: hydrochloric acid: water ═ 11.8-12.5: (0.9-1.2): (0.6-0.8): (4.1-4.5): (14.7-15): (66-67.9) so that the acid liquid can better enter the target oil layer.
Further, the reaction acid solution injected in the step S3 is injected in a pulse mode through a pulse pressurizing device, and the injection speed is 0.35-0.7m 3 Min, injection amount 15m 3 And the pumping pressure is 12-14MPa, the bottom hole pressure is monitored in real time, the bottom hole pressure is kept lower than 14MPa, the injection is stopped when the bottom hole pressure exceeds 14MPa, the injection is continuously started when the pressure drops back to 10MPa, and the reaction acid liquid comprises the following components in percentage by mass: ammonium fluoride: surfactant (b): and (3) earth acid: water ═ 8.2 to 8.4: (6-6.5): (5.5-6): (15.5-15.8): (63.3-64.8), so that the reaction acid liquid is fully mixed with the preposed acid liquid and the reaction acid liquid cannot permeate into other bottom layers.
Further, the distance of each time of taking out the acidizing string in the step S4-1 is 200m, the pump injection pressure is monitored in real time when the production string is put down in the step S4-2, when the pump injection pressure exceeds 8MPa, the production string is stopped to be put in, when the pressure drops back to 5.5MPa, the production string is continuously put in, and the component content mass ratio of the neutralizer is sodium hydroxide: potassium hydroxide: sodium carbonate: sodium bicarbonate: water ═ 2.2 to 2.4: (2.8-3): (4.4-4.8): (3.5-4): (85.8-87.1), the residual acid liquid is fully neutralized and discharged through neutralizing the residual acid liquid in the stratum and neutralizing the residual acid liquid in the shaft, so that pollution is avoided, and pressure monitoring is carried out to avoid blowout caused by bottom hole pressure leakage or insufficient pressure.
An oil well acidizing device for improving the yield of an oil and gas well comprises an acid liquor tank for preparing acid liquor, wherein a water inlet is formed in one side above the acid liquor tank, a stirring tank is arranged in the acid liquor tank below the water inlet, a stirring device for connecting the upper bottom surface and the lower bottom surface of the stirring tank is arranged in the center of the stirring tank, the upper part, close to the well head, of the outer wall of the stirring tank is connected with a purification tank for purifying harmful gas through an air pumping pipeline, the lower part, close to the well head, of the outer wall of the stirring tank is connected with a buffer tank below the purification tank through a liquid outlet pipe, one side, close to the well head, of the outer lower part of the buffer tank is connected with a liquid inlet of the well head device through a high-pressure pipeline of which the end part is provided with an acid liquor pump, and the bottom of the well head device is fixedly connected with a sleeve,
an acidification pipe column penetrating through the wellhead device and then penetrating to the bottom of the casing, wherein the top of the acidification pipe column is connected with the high-pressure pipeline, the bottom of the acidification pipe column is provided with a nozzle, two sides of the acidification pipe column above the nozzle corresponding to the position of an oil layer are provided with pulse supercharging devices,
and the waste liquid tank is connected with a liquid outlet of the wellhead device.
Furthermore, the stirring device comprises a main shaft positioned in the center and a plurality of stirring rods which are circumferentially arranged on the main shaft at equal intervals, the main shaft and the stirring rod are both arranged in a hollow way, the lower part of the main shaft is provided with a rotating motor, the main shaft is connected with an acid liquor inlet above the stirring tank through an acid liquor pipe inside, the acid liquid pipe is connected with the inner cavity of each stirring rod, a baffle is arranged at the connecting end of the inner cavity and the acid liquid pipe, the outer bottom of the baffle is connected with a positioning plate on the inner wall of the inner cavity through a spring, the positioning plate is provided with a plurality of through holes, the other end of the inner cavity is communicated with the inner space of the stirring tank through a ball-type check valve which enables fluid to pass through in one way, stirring and mixing are carried out while acid liquor is injected, the acid liquor can be prevented from being contacted with air and being reacted and deteriorated, and the baffle can be moved by centrifugal force generated when the stirring rod rotates to extrude the spring, so that the acid liquor flows out.
Further, the inner wall of the purification tank on one side of the gas pumping pipeline is provided with a draught fan, a first filter screen is arranged in the purification tank on the rear side of the draught fan, the bottom of the purification tank is provided with an air-vent valve, the lower end of the air-vent valve is provided with an air inlet pipeline connected with a buffer tank, a second filter screen is arranged in the purification tank above the air-vent valve, the upper portion of one side of the buffer tank is provided with a nitrogen inlet, hydrogen sulfide gas generated when acid liquor and water are mixed can be purified to reduce harm to the environment and personnel, and the quality of the acid liquor is guaranteed simultaneously.
Furthermore, the acidizing tubular column where the pulse supercharging device is located is a reducing section, the pulse supercharging device comprises liquid storage cavities which are located on two sides of the acidizing tubular column and blade rotating wheels which are located inside the acidizing tubular column and are connected with the two liquid storage cavities, an opening is formed in the upper portion of each liquid storage cavity, the blade rotating wheels can be driven to continuously rotate by means of force flowing through fluid inside the acidizing tubular column, two sides of each blade rotating wheel are rotatably connected with a main gear inside the liquid storage cavities through connecting rods which are matched with the blade rotating wheels to rotate, the connecting rods are connected with the inner walls of the liquid storage cavities in a sliding and sealing mode, the main gear is arranged in parallel with the acidizing tubular column and can rotate synchronously with the blade rotating wheels, one half of the outer circumference of the main gear is provided with teeth, the other half of the outer circumference of the main gear is provided with smooth circular arcs, one part of the outer circumference of the main gear provided with the teeth is meshed with a bevel gear which is vertically arranged on the inner side of the bottom of the main gear, and the bevel gear is fixed on a limiting plate which is vertically arranged on the inner wall of the liquid storage cavities through a connecting rod at the center of the bottom of the main gear, the bevel gear is meshed with a screw rod positioned on the inner side of the bevel gear and used for controlling the screw rod to move up and down, a flow limiting plate is arranged at the bottom of the screw rod, a through hole used for enabling the screw rod to pass through is formed in the middle of each limiting plate, the limiting plates on two sides of the through hole are connected with the flow limiting plate through springs respectively, the flow limiting plates are connected with a pulse channel at the bottom of the liquid storage cavity in a sealing mode, each outlet of the pulse channel is communicated with the outer side wall of the liquid storage cavity, and the pulse device can absorb acid liquid at the bottom of the well again and remove the acid liquid to generate a pulse oscillation effect, so that the acid liquid enters an oil layer in a fluctuating mode, the swept area is enlarged, and the injection effect of the acid liquid is effectively enhanced.
Further, the nozzle is equipped with the filter screen outward, the upper portion of wellhead assembly is equipped with total valve, is located to be equipped with out the liquid valve in the wellhead assembly of liquid outlet department, the import department of waste liquid jar is equipped with the reposition of redundant personnel jar, export one side of reposition of redundant personnel jar is equipped with first fluid outlet and second fluid outlet, the second fluid outlet is connected with the jar of neutralization, and the bottom is equipped with the pH monitoring devices who is used for controlling first fluid outlet and second fluid outlet to open and shut in the reposition of redundant personnel jar, can monitor the pH value of discharge acidizing fluid, if exceed standard then shunt to jar secondary neutralization back again discharge.
The invention has the advantages that
(1) The oil well acidification process adopts three-stage acidification, the step of neutralizing acid liquor is completed in a shaft bottom part, the acid liquor content in the return fluid is greatly reduced, the components of the pre-acid liquor, the reaction acid liquor and the neutralizing agent are optimized, the oil layer blockage can be effectively solved, the purpose of increasing the yield is achieved, the construction is convenient, the problems of potential safety hazard, environment and the like are eliminated, and the oil well acidification process has good economic benefit and popularization prospect.
(2) According to the invention, by arranging the pulse device, when the acid liquid is injected, the pulse device can absorb the acid liquid at the bottom of the well again and remove the pulse shock effect, so that the acid liquid enters the oil layer in a fluctuating manner, the swept area is enlarged, and the injection effect of the acid liquid is effectively enhanced.
(3) The device can rapidly and efficiently prepare a plurality of required acid liquids on site without discharging generated harmful gases, and simultaneously ensures that the prepared acid liquids are not polluted by contacting with air.
Drawings
FIG. 1 is a schematic diagram of the overall construction of an oil well acidizing apparatus of the present invention;
FIG. 2 is a schematic diagram of the stirring device of the oil well acidizing apparatus of the present invention;
FIG. 3 is a schematic diagram of the construction of the stirring rod of the oil well acidizing apparatus of the present invention;
FIG. 4 is a cross-sectional view A-A of the oil well acidizing apparatus stir bar of the present invention from FIG. 3;
FIG. 5 is a schematic view of the configuration of the stirring rod B-B of the oil well acidizing apparatus of FIG. 3 according to the present invention;
FIG. 6 is a top view of the stirring apparatus of the oil well acidizing apparatus of the present invention;
FIG. 7 is a schematic view showing the internal structure of a purification tank of the oil well acidizing apparatus;
FIG. 8 is a schematic view of the internal structure of the pulse booster of the oil well acidizing apparatus;
FIG. 9 is a schematic diagram of the external structure of the pulse booster of the oil well acidizing apparatus of the present invention;
FIG. 10 is a schematic diagram of the oil well acidizing process step S2 with the injection of a pre-acid solution;
FIG. 11 is a schematic diagram of the oil well acidizing process step S3 injecting reaction acid solution;
FIG. 12 is a schematic illustration of the oil well acidizing process step S4 injecting a neutralizing agent in accordance with the present invention;
FIG. 13 is a schematic diagram of the acidizing column lifted up at step S4-1 of the oil well acidizing process of the present invention;
FIG. 14 is a schematic view of the well acidizing process step S4-2 running production string in accordance with the present invention.
Wherein, 1-acid liquid tank, 11-water inlet, 12-stirring tank, 13-purification tank, 131-induced draft fan, 132-pressure regulating valve, 133-first filter screen, 134-second filter screen, 14-buffer tank, 141-nitrogen inlet, 15-acid liquid pump, 16-high pressure pipeline, 2-stirring device, 21-main shaft, 22-stirring rod, 23-rotating motor, 24-acid liquid pipe, 25-inner cavity, 26-baffle, 27-positioning plate, 28-ball check valve, 3-well head device, 31-casing, 32-main valve, 33-liquid outlet valve, 4-acidification column, 41-packer, 42-nozzle, 43-filter screen, 5-pulse supercharging device, 51-blade runner, 52-liquid storage cavity, 53-connecting rod, 54-main gear, 55-bevel gear, 56-limiting plate, 57-screw, 58-flow limiting plate, 59-pulse channel, 6-waste liquid tank, 6-shunt tank, 62-neutralization tank, 63-first liquid discharge port, 64-second liquid discharge port, 65-pH monitoring device, 7-preposed acid liquid, 8-reaction acid liquid and 9-neutralizing agent.
Detailed Description
Example 1
As shown in fig. 1, a well acidizing process for improving the production of oil and gas wells comprises the following steps:
s1 acidification pretreatment: pulling out a production pipe column in a test well with a well body of 1387m, putting the production pipe column into a well washing pipe column, and carrying out a positive well washing and a reverse well washing, wherein the positive well washing is that a well washing liquid is injected into a sleeve pipe from the interior of the well washing pipe column and returns out, the reverse well washing is that the well washing liquid is injected into the sleeve pipe from the interior of the sleeve pipe and returns out from the interior of the well washing pipe column, and the volume of the well washing liquid is 12m 3 The well flushing liquid comprises the following components in percentage by mass: fluid loss additive: octyl phenol polyoxyethylene ether: water-4: 2: 3: 91, pulling out the well washing pipe column after the well washing is finished;
s2 injecting a preposed acid solution 7: as shown in fig. 10, an acidizing string 4 with a packer 41 is put in, the packer 41 is a commercially available Y241-115 packer, the packer 41 is positioned at the upper part of an oil layer, the packer 41 is sealed by pressurizing the acidizing string 4, a pre-acid solution 7 is injected into the acidizing string 4 and is injected in a pulse mode through a pulse pressurizing device 5, the injection time and the pause time in each pulse period are both 1s, and the component content mass ratio of the pre-acid solution 7 is earth acid: fluoboric acid: corrosion inhibitor: citric acid: hydrochloric acid: water-12: 1.2: 0.6: 4.2: 15: 67, injection velocity of 0.2m 3 Min, injection amount 25m 3 Pumping the pre-acid solution 7 into a target oil layer from an annular space between the acidizing pipe column 4 and the sleeve 31 under the pressure of 18MPa, and closing the well for reaction for 1-2 hours;
s3 pouring reaction acid liquid 8: as shown in fig. 11, a reaction acid solution 8 is injected into the acidification column 4 for reacting with the pre-acid solution 7 to generate heat and gas, and is injected in a pulse mode through the pulse pressurizing device 5, wherein the injection time and the dwell time are both 1s in each pulse period, and the injection speed is 0.35m 3 Min, injection amount 15m 3 Pumping pressure 14MPa, monitoring bottom hole pressure in real time, keeping the bottom hole pressure lower than 14MPa, stopping injecting when the bottom hole pressure exceeds 14MPa, and continuing to inject when the pressure falls back to 12MPa, wherein the component content mass ratio of the reaction acid liquid 8 is sodium nitrite: ammonium fluoride:surfactant (b): and (3) earth acid: water-8.4: 6: 6: 15.6: 64 extruding the reaction acid liquid 8 into a target oil layer from the annular space of the acidizing pipe column 4 and the sleeve 31, reacting with the preposed acid liquid 7, and closing the well for reaction for 4-6 h;
s4 injection of neutralizer 9:
s4-1: as shown in fig. 12 and 13, a neutralizer 9 for neutralizing the residual acid solution in the target oil layer is injected into the acidizing column 4 at a rate of 0.1m 3 Min, injection amount 1.5m 3 Pumping the acidizing pipe column 4 under the pressure of 10MPa, simultaneously taking the acidizing pipe column 4 away from the bottom of the well by 200m, then injecting the neutralizing agent 9 into the acidizing pipe column 4 again at the same injection speed and injection amount until the acidizing pipe column 4 is completely taken out, and closing the well for reaction for 4 hours;
s4-2: as shown in fig. 14, a well is opened to drain a part of pressure in the casing 31, a production string is put in, a neutralizer 9 is continuously injected into the production string in the putting process, the pump injection pressure is kept lower than 8MPa, the bottom hole pressure is kept lower than the oil layer pressure in a negative pressure underbalance state, residual acid liquor in a target oil layer is used for entering an annular space between the production string and the casing 31, exciting pressure is generated when the production string is put in, the bottom hole pressure is increased, therefore, the pump injection pressure is monitored in real time, when the pump injection pressure exceeds 8MPa, the production string is stopped to be put in, when the pressure falls back to 5.5MPa, the production string is continuously started to be put in, and the component content mass ratio of the neutralizer 9 is sodium hydroxide: potassium hydroxide: sodium carbonate: sodium bicarbonate: water 2.2: 3: 4.8: 4: 86, after the production pipe column is lowered to the bottom of the well, the annular space is filled with the neutralizer 9 and the mixed acid liquor, and the well is closed for reaction for 8 hours;
s5: and (5) opening the well, and recovering normal production of the oil well.
As shown in fig. 1 and 7, an oil well acidizing device for improving the yield of oil and gas wells comprises an acid liquor tank 1 for preparing acid liquor, a water inlet 11 is arranged on one side above the acid liquor tank 1, a stirring tank 12 is arranged in the acid liquor tank 1 below the water inlet 11, a stirring device 2 connected with the upper bottom surface and the lower bottom surface of the stirring tank 12 is arranged in the center of the stirring tank 12, the upper part of the outer wall of the stirring tank 12 close to a well head is connected with a purification tank 13 for purifying harmful gas through an air pumping pipeline, an induced draft fan 131 is arranged on the inner wall of the purification tank 13 on one side of the air pumping pipeline, the induced draft fan 131 is a commercially available W2E200-HK38-01 fan, a first filter screen 133 is arranged in the purification tank 13 on the rear side of the induced draft fan 131, a pressure regulating valve 132 is arranged at the bottom of the purification tank 13, the pressure regulating valve 132 is a commercially available T807 pneumatic thin-film high-pressure regulating valve, an air inlet pipeline connected with a buffer tank 14 is arranged at the lower end of the induced draft fan 131, a second filter screen 134 is arranged in the purification tank 13 above the pressure regulating valve 132, 14 one side upper portions of buffer tank are equipped with nitrogen gas entry 141, and 12 outer walls of agitator tank are close to well head one side lower part and are passed through the drain pipe and be connected with the buffer tank 14 that is located the purification tank 13 below, and 14 outer lower parts of buffer tank are close to well head one side and are connected with well head device 3's inlet through 16 high-pressure line that the tip was equipped with the sour liquid pump 15 of high pressure line, well head device 3 bottoms and sleeve pipe 31 fixed connection.
When the purification tank 13 is used, the induced draft fan 131 absorbs harmful gas hydrogen sulfide and the like generated by stirring in the stirring tank 12 into the purification tank 13, the harmful gas is discharged after being filtered by the first filter screen 133, the nitrogen inlet 141 injects nitrogen into the buffer tank 14 to extrude residual harmful gas, so that the prepared acid liquor is prevented from being polluted, and when the pressure received by the pressure regulating valve 132 is greater than 5MPa, the gas is automatically opened and discharged into the purification tank 13 and then is purified by the second filter screen 134 to be discharged.
As shown in fig. 2-6, the stirring device 2 includes a main shaft 21 located at the center and a plurality of stirring rods 22 circumferentially arranged on the main shaft 21 at equal intervals, the main shaft 21 and the stirring rods 22 are both hollow, a rotating motor 23 is arranged at the lower part of the main shaft 21, the rotating motor 23 is a commercially available stirring tank, the shape and structure of the commercially available stirring tank are adjusted by a motor to adapt to the device, the main shaft 21 is connected with an acid inlet above the stirring tank 12 through an internal acid pipe 24, the acid pipe 24 is connected with an inner cavity 25 of each stirring rod 22, a baffle 26 is arranged at one end of the inner cavity 25 connected with the acid pipe 24, the outer bottom of the baffle 26 is connected with a positioning plate 27 on the inner wall of the inner cavity 25 through a spring, the positioning plate 27 is provided with a plurality of through holes, the other end of the inner cavity 25 is communicated with the inner space of the stirring tank 12 through a ball check valve 28 enabling fluid to pass through in one way, and the ball check valve 28 is a commercially available HQ41X ball check valve.
When the stirring device 2 is used, acid liquor is injected from an acid liquor inlet above the main shaft 21, the acid liquor enters the acid liquor pipe 24, after the rotating motor 23 is started, the main shaft 21 drives the stirring rods 22 to rotate, the baffle 26 pushes the spring to move towards one side of the positioning plate 27 under the action of centrifugal force, the inner cavity 25 of each stirring rod 22 is communicated with the acid liquor pipe 24, the acid liquor enters the inner cavity 25 of each stirring rod 22, passes through the through holes in the positioning plate 27 and enters the stirring tank 12 through the ball-type check valve 28 to be stirred and mixed, and when stirring is stopped, the baffle 26 is bonded and sealed with the end part of the inner cavity 25 again under the action of the restoring thrust of the spring, so that the acid liquor is prevented from entering and influencing the proportioning of the acid liquor.
As shown in fig. 1, 8 and 9, the acidizing tubular column 4 penetrating through the wellhead device 3 and then extending into the bottom of the casing 31, the top of the acidizing tubular column 4 is connected with a high-pressure pipeline 16, the bottom of the acidizing tubular column 4 is provided with a nozzle 42, a filter screen 43 is arranged outside the nozzle 42, pulse supercharging devices 5 are arranged on two sides of the acidizing tubular column 4 corresponding to the position of an oil layer above the nozzle 42, the acidizing tubular column 4 where the pulse supercharging devices 5 are located is a reducing section, each pulse supercharging device 5 comprises a liquid storage cavity 52 located on two sides of the acidizing tubular column 4 and a blade rotating wheel 51 located inside the acidizing tubular column 4 and connected with the two liquid storage cavities 52, an opening is arranged on the upper portion of each liquid storage cavity 52 and used for enabling liquid to enter the liquid storage cavity 52, the blade rotating wheel 51 can be driven to continuously rotate by the force flowing through the fluid in the acidizing tubular column 4, two sides of each blade rotating wheel 51 are rotatably connected with a main gear 54 inside the liquid storage cavity 52 through a connecting rod 53 which is matched with the blade rotating, the connecting rod 53 is connected with the inner wall of the liquid storage cavity 52 in a sliding sealing manner, the main gear 54 is arranged in parallel with the acidizing tubular column 4, half of the outer circumference of the main gear 54 is provided with teeth, the other half of the outer circumference of the main gear 54 is a smooth circular arc, one part of the outer circumference of the main gear 54 with teeth is meshed with a bevel gear 55 vertically arranged on the inner side of the bottom of the main gear 54, the bevel gear 55 is fixed on a limiting plate 56 vertically arranged on the inner wall of the liquid storage cavity 52 through a connecting rod at the center of the bottom of the main gear, the bevel gear 55 is meshed with a screw 57 positioned on the inner side of the bevel gear and used for controlling the screw 57 to move up and down, the bottom of the screw 57 is provided with a limiting plate 58, the middle part of the limiting plate 56 is provided with a through hole for the screw 57 to pass through, the limiting plates 56 on both sides of the through hole are respectively connected with the limiting plate 58 through a spring, the limiting plate 58 is hermetically connected with a pulse channel 59 at the bottom of the liquid storage cavity 52, and each outlet of the pulse channel 59 is communicated with the outer side wall of the liquid storage cavity 52.
When the pulse supercharging device 5 is used, the acid liquor flows through the blade rotating wheel 51 to continuously rotate, meanwhile, the connecting rod 53 drives the main gear 54 to rotate, when a part of the teeth of the main gear 54 rotate to be meshed with the bevel gear 55, the bevel gear 55 drives the screw 57 to move upwards, the flow limiting plate 58 at the bottom of the screw 57 moves upwards to leave the bottom of the liquid storage cavity 52, so that the acid liquor in the liquid storage cavity 52 can enter the pulse channel 59, when a part of the teeth of the main gear 54 which is not meshed with the bevel gear 55 after half a circle of rotation, the bevel gear 55 does not drive the screw 57 to rotate any more, the spring on the limiting plate 56 is reset, the screw 57 moves downwards to enable the flow limiting plate 58 to extrude the acid liquor into the pulse channel 59 and then to be in sealed contact with the bottom of the liquid storage cavity 52 again, and a pulse period is completed.
As shown in fig. 1, a waste liquid tank 6 connected to a liquid outlet of a wellhead 3, a main valve 32 is provided at an upper portion of the wellhead 3, a liquid outlet valve 33 is provided in the wellhead 3 at the liquid outlet, the opening of the liquid outlet valve 33 is adjusted to adjust the pressure relief amount, a shunt tank 61 is provided at an inlet of the waste liquid tank 6, a first liquid outlet 63 and a second liquid outlet 64 are provided at one side of an outlet of the shunt tank 61, the second liquid outlet is connected to a neutralization tank 62, a pH monitoring device 65 for controlling the first liquid outlet 63 and the second liquid outlet 64 to open and close is provided at a bottom portion in the shunt tank 61, when the pH in the flowback liquid is less than 6.5, the pH monitoring device 65 controls to open the second liquid outlet 64 so that the flowback liquid enters the neutralization tank 62 to continue neutralization, and when the pH in the flowback liquid is greater than 6.5, the pH monitoring device 65 controls to open the first liquid outlet 63 so that the flowback liquid is discharged.
Example 2
The present embodiment is substantially the same as embodiment 1, and differs therefrom in the injection speeds of the pre-acid solution 7, the reaction acid solution 8, and the neutralizer 9, specifically:
injecting a preposed acid solution 7: the injection speed is 0.35m 3 /min；
Injecting reaction acid liquor 8: the injection speed is 0.55m 3 /min；
Injecting a neutralizing agent 9: the injection speed is 0.2m 3 /min。
Example 3
The present embodiment is substantially the same as embodiment 1, and differs therefrom in the injection speeds of the pre-acid solution 7, the reaction acid solution 8, and the neutralizer 9, specifically:
injecting a preposed acid solution 7: the injection speed is 0.5m 3 /min；
Injecting reaction acid liquor 8: the injection speed is 0.7m 3 /min；
Injecting a neutralizing agent 9: the injection speed is 0.3m 3 /min。
Examples of the experiments
The results of using the well acidizing process of examples 1-3 to compare the results with conventional acidizing are shown in table 1:
table 1 construction effects obtained by the oil well acidizing process in examples 1-3
Therefore, the yield of the test well is increased obviously after the acidification process is adopted, the daily oil production and the stable production time are improved, and the pH values of the well head samples in the examples 1 to 3 are close to the neutralization value compared with the pH value after the conventional acidification, so that the residual acid liquor is effectively neutralized, and the pollution to the environment is reduced; it can be seen from comparison of examples 1-3 that when a lower injection speed is adopted, the oil yield increment per day is low because the injection speed is low, the bottom hole pressure is low, the pulse effect is not obvious, the oil layer longitudinal blockage removal effect is poor, but the yield stabilization time is long, which indicates that the transverse blockage removal effect is good, while in example 3, a high injection speed is adopted, so that the bottom hole pressure is high, the pulse pressurization effect is good, the oil layer longitudinal blockage removal effect is good, the transverse blockage removal effect is poor, the oil yield increment per day is large, but the yield stabilization time is short, and the cumulative production increase is lower than those in examples 1 and 2.
Claims (9)
1. An oil well acidizing process for improving the production of oil and gas wells, comprising the steps of:
s1 acidification pretreatment: pulling out a production pipe column in the test well, putting the production pipe column into a well washing pipe column, washing the well, and pulling out the well washing pipe column after the well washing is finished;
s2 injecting a preposed acid liquid (7): putting an acidizing tubular column (4) with a packer (41) into the well, enabling the packer (41) to be located at the upper part of an oil layer, pressurizing the interior of the acidizing tubular column (4) to seal the packer (41), injecting a preposed acid liquid (7) into the acidizing tubular column (4), enabling the preposed acid liquid (7) to be squeezed into a target oil layer from an annular space between the acidizing tubular column (4) and a sleeve (31), and closing the well for reaction for 1-2 hours;
s3 pouring reaction acid liquid (8): injecting a reaction acid liquid (8) into the acidification column (4) for reacting with the preposed acid liquid (7) to generate heat and gas, extruding the reaction acid liquid (8) into a target oil layer from the annular space of the acidification column (4) and the sleeve (31) and reacting with the preposed acid liquid (7), and closing the well for reaction for 4-6 h;
s4 shot neutralizer (9):
s4-1: injecting a neutralizing agent (9) into the acidizing tubular column (4), wherein the neutralizing agent is used for neutralizing residual acid liquor in a target oil layer, and the injection speed is 0.1-0.3m 3 Min, injection amount 1.5m 3 Pumping the acidizing column (4) under the pressure of 10MPa, taking the acidizing column (4) away from the bottom of the well for a certain distance, then injecting a neutralizer (9) into the acidizing column (4) again at the same injection speed and injection amount until the acidizing column (4) is completely taken out, and closing the well for reaction for 4 hours;
s4-2: opening a well, discharging a part of pressure in a casing (31), putting a production string, continuously injecting a neutralizing agent (9) into the production string in the putting process, keeping the pump injection pressure lower than 8MPa, keeping the bottom hole pressure lower than the oil layer pressure in a negative pressure underbalance state, enabling residual acid liquid in a target oil layer to enter an annular space between the production string and the casing (31), filling the annular space with the neutralizing agent (9) and mixed acid liquid after the production string is put to the bottom hole, and closing the well for reacting for 8 hours;
s5: and (5) opening the well, and recovering normal production of the oil well.
2. The well acidizing process for improving the production of oil and gas wells as claimed in claim 1, wherein said step S1 of acidizing the well-flushing in the pretreatment comprises one positive well-flushing and one reverse well-flushing, and the volume of the flushing fluid is 12m 3 The well flushing liquid comprises the following components in percentage by mass: fluid loss additive: octyl phenol polyoxyethylene ether: water ═ 3.8-4.2: (1.9-2.2): (2.6-3): (90.6-91.7).
3. The well acidizing process for the production of oil and gas wells according to the claim 1, wherein said step S2 injects the pre-acid (7) by means of the impulse pressurization device (5) in a pulsed manner with the injection speed of 0.2-0.5m 3 Min, injection amount 25m 3 The pump injection pressure is 18MPa, the injection time and the pause time in each pulse cycle are both 1s, and the mass ratio of the components of the preposed acid liquid (7) is earth acid: fluoboric acid: corrosion inhibitor: citric acid: hydrochloric acid: water ═ 11.8-12.5: (0.9-1.2): (0.6-0.8): (4.1-4.5): (14.7-15): (66-67.9).
4. The well acidizing process for the production of oil and gas wells according to the claim 1, wherein said step S3 of injecting the reaction acid (8) is carried out by means of a pulse pressurizing device (5) in a pulse manner, the injection speed is 0.35-0.7m 3 Min, injection amount 15m 3 And the pumping pressure is 12-14MPa, the bottom hole pressure is monitored in real time, the bottom hole pressure is kept lower than 14MPa, the injection is stopped when the bottom hole pressure exceeds 14MPa, the injection is continued when the pressure drops back to 10MPa, and the reaction acid liquid (8) comprises the following components in percentage by mass: ammonium fluoride: surfactant (b): and (3) earth acid: water ═ 8.2 to 8.4: (6-6.5): (5.5-6): (15.5-15.8): (63.3-64.8), and closing the well for reaction for 4-6 h.
5. The well acidizing process for improving the production of oil and gas wells according to the claim 1, wherein the distance of each time of taking out the acidizing string (4) in the step S4-1 is 200m, the pump injection pressure is monitored in real time when the production string is lowered in the step S4-2, the lowering of the production string is stopped when the pump injection pressure exceeds 8MPa, the lowering of the production string is continued when the pressure drops back to 5.5MPa, and the component content mass ratio of the neutralizer (9) is sodium hydroxide: potassium hydroxide: sodium carbonate: sodium bicarbonate: water ═ 2.2 to 2.4: (2.8-3): (4.4-4.8): (3.5-4): (85.8-87.1).
6. The utility model provides an oil well acidizing device for improving oil gas well output, its characterized in that, including sour fluid reservoir (1) that is used for preparing the acidizing fluid, sour fluid reservoir (1) top one side is equipped with water inlet (11), be equipped with agitator tank (12) in sour fluid reservoir (1) of water inlet (11) below, agitator tank (12) inner center is equipped with agitating unit (2) of connecting bottom surface about agitator tank (12), and agitator tank (12) outer wall is close to well head one side upper portion and is connected with purification tank (13) that are used for purifying harmful gas through the gas pumping pipeline, and agitator tank (12) outer wall is close to well head one side lower part and is passed through the drain pipe and is located buffer tank (14) of purification tank (13) below are connected, buffer tank (14) outer lower part is close to well head one side and is connected with the inlet of well head device (3) through high-pressure pipeline (16) that the tip was equipped with sour fluid pump (15), the bottom of the wellhead device (3) is fixedly connected with a casing (31),
an acidification pipe column (4) penetrating through the wellhead device (3) and then penetrating into the bottom of the casing (31), wherein the top of the acidification pipe column (4) is connected with the high-pressure pipeline (16), the bottom of the acidification pipe column is provided with a nozzle (42), pulse supercharging devices (5) are arranged on two sides of the acidification pipe column (4) above the nozzle (42) corresponding to the position of an oil layer,
a waste liquid tank (6) connected with a liquid outlet of the wellhead device (3);
the stirring device (2) comprises a main shaft (21) positioned at the center and a plurality of stirring rods (22) which are circumferentially arranged on the main shaft (21) at equal intervals, the main shaft (21) and the stirring rod (22) are both arranged in a hollow way, the lower part of the main shaft (21) is provided with a rotating motor (23), the main shaft (21) is connected with an acid liquor inlet above the stirring tank (12) through an acid liquor pipe (24) inside, the acid liquid pipe (24) is connected with the inner cavity (25) of each stirring rod (22), a baffle plate (26) is arranged at one end of the inner cavity (25) connected with the acid liquor pipe (24), the outer bottom of the baffle (26) is connected with a positioning plate (27) on the inner wall of the inner cavity (25) through a spring, the positioning plate (27) is provided with a plurality of through holes, and the other end of the inner cavity (25) is communicated with the inner space of the stirring tank (12) through a ball-type check valve (28) which enables fluid to pass in a single direction.
7. The oil well acidification device for improving the yield of oil and gas wells according to claim 6, characterized in that the inner wall of the purification tank (13) on one side of the pumping pipeline is provided with an induced draft fan (131), a first filter screen (133) is arranged in the purification tank (13) on the rear side of the induced draft fan (131), the bottom of the purification tank (13) is provided with a pressure regulating valve (132), the lower end of the pressure regulating valve (132) is provided with an air inlet pipeline connected with the buffer tank (14), a second filter screen (134) is arranged in the purification tank (13) above the pressure regulating valve (132), and the upper part on one side of the buffer tank (14) is provided with a nitrogen inlet (141).
8. The oil well acidizing device used for improving the oil and gas well yield according to claim 6, wherein the acidizing tubular column (4) where the pulse pressurizing device (5) is located is a reducing section, the pulse pressurizing device (5) comprises liquid storage cavities (52) located at two sides of the acidizing tubular column (4) and a vane rotating wheel (51) located inside the acidizing tubular column (4) and connected with the two liquid storage cavities (52), an opening is formed in the upper portion of each liquid storage cavity (52), the vane rotating wheel (51) can be driven to rotate continuously by means of the flowing force of the fluid in the acidizing tubular column (4), two sides of each vane rotating wheel (51) are rotatably connected with a main gear (54) inside the liquid storage cavity (52) through a connecting rod (53) which rotates in a matching mode, the connecting rods (53) are connected with the inner walls of the liquid storage cavities (52) in a sliding and sealing mode, and the main gear (54) is arranged in parallel with the acidizing tubular column (4), one half of the outer circumference of the main gear (54) is provided with teeth, the other half is a smooth circular arc, a part of the outer circumference of the main gear (54) with the teeth is engaged with a bevel gear (55) vertically arranged at the inner side of the bottom thereof, the bevel gear (55) is fixed on a limit plate (56) vertically arranged on the inner wall of the liquid storage cavity (52) through a connecting rod at the center of the bottom, the bevel gear (55) is meshed with a screw rod (57) positioned at the inner side of the bevel gear, used for controlling the screw rod (57) to move up and down, the bottom of the screw rod (57) is provided with a flow limiting plate (58), the middle part of the limit plate (56) is provided with a through hole for the screw rod (57) to pass through, the limiting plates (56) at the two sides of the through hole are respectively connected with the flow limiting plate (58) through a spring, the flow limiting plate (58) is hermetically connected with a pulse channel (59) at the bottom of the liquid storage cavity (52), each outlet of the pulse channel (59) is communicated with the outside of the outer side wall of the liquid storage cavity (52).
9. The oil well acidizing device for improving oil and gas well production according to claim 6, characterized in that a filter screen (43) is arranged outside the nozzle (42), a main valve (32) is arranged on the upper portion of the wellhead device (3), a liquid outlet valve (33) is arranged in the wellhead device (3) at the liquid outlet, a shunt tank (61) is arranged at the inlet of the waste liquid tank (6), a first liquid outlet (63) and a second liquid outlet (64) are arranged on one side of the outlet of the shunt tank (61), the second liquid outlet is connected with a neutralization tank (62), and a pH monitoring device (65) for controlling the opening and closing of the first liquid outlet (63) and the second liquid outlet (64) is arranged at the bottom in the shunt tank (61).
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| CN116378622B (en) * | 2023-06-06 | 2023-08-18 | 西安博宏石油科技有限公司 | Acid liquor injection device for acidification of oil field oil-water well |
| CN118995187B (en) * | 2024-10-17 | 2025-02-11 | 德仕(成都)石油科技有限公司 | A kind of non-flowback acidification working fluid and its preparation method and construction process |
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Denomination of invention: An oil well acidification process and device for increasing oil and gas well production Granted publication date: 20220920 Pledgee: Shaanxi Qin Nong rural commercial bank Limited by Share Ltd. hi tech sub branch Pledgor: XI'AN PETROLEUM GREAT PETROLEUM TECHNOLOGY Co.,Ltd. Registration number: Y2024610000128 |
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