CN113494271A - Shaft blockage removing method and device for high-pressure gas well - Google Patents
Shaft blockage removing method and device for high-pressure gas well Download PDFInfo
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/06—Cutting windows, e.g. directional window cutters for whipstock operations
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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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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Abstract
The invention provides a shaft blockage removing method and a shaft blockage removing device for a high-pressure gas well, wherein the blockage removing method comprises the following steps: injecting working fluid into the well bore for acidizing treatment; perforating the oil pipe; and carrying out open flow treatment on the high-pressure gas well. The invention can increase the oil drainage area through the perforation of the oil pipe on the basis of acid solution blockage removal, thereby realizing the blockage removal of the shaft of the high-pressure gas well with simplicity, safety, high efficiency and low cost.
Description
Technical Field
The invention relates to a gas well blockage relieving method, in particular to a shaft blockage relieving method and device of a high-pressure gas well, and belongs to the technical field of yield increasing development of petroleum and natural gas.
Background
At present, the production is continuously reduced due to the blockage of a high-pressure gas well shaft, and part of the well shaft is completely blocked and cannot normally produce. Early analysis and research suggest that factors such as formation sand production, wellbore scaling, lost circulation of lost material, mud sedimentation and the like may be the main causes of wellbore plugging.
At present, the blockage removal method for gas well shaft blockage generally has three types: the first blockage removing method is open-flow blockage removing, namely, the production pressure difference is amplified, and the blockage in a shaft is discharged by using high-pressure high-speed gas; the second plug removal method is an overhaul operation, namely, the original pipe column in the well is taken out, and a new pipe column is put in again to complete the well; the third plug removal method is acidizing operation, and because the high-pressure gas well plugs are mainly inorganic scales or stratum sand, acidizing can be used as one of main measures for removing wellbore sand plug or scale plug and recovering gas well productivity.
However, the effect of multiple open flow blockage removal operations carried out in the early stage of blockage removal by taking a high-pressure gas well as a blockage removal object is not ideal. The blockage of the high-pressure gas well of the shaft is treated through overhaul operation, so that the corresponding problems of complex working procedures, long operation period, high cost and the like exist; and the blockage removal in the acidizing operation can remove the blockage of a shaft and a near-well zone, but has no obvious influence on the improvement of the productivity of the high-pressure gas well.
Therefore, under the background of stable production and yield increase of the current oil and gas field, further research and optimization of a shaft blockage removing process are urgently needed, a simple, safe and efficient shaft blockage removing technology is provided, and the gas field is strongly supported to be efficiently exploited.
In view of the above, in order to further develop the research and optimization of the shaft blockage removing process and provide a simple, safe, efficient and low-cost shaft blockage removing technology, the invention provides a high-pressure gas well shaft acid solution blockage removing technical method for increasing the oil drainage area based on the perforation of an oil pipe.
Disclosure of Invention
The invention provides a shaft blocking removal method of a high-pressure gas well, which can increase the oil drainage area through the perforation of an oil pipe on the basis of acid solution blocking removal, thereby realizing the shaft blocking removal of the high-pressure gas well simply, safely, efficiently and at low cost.
The invention provides a shaft blockage removing device of a high-pressure gas well, which can increase the oil drainage area through the perforation of an oil pipe on the basis of acid blockage removal, thereby realizing shaft blockage removal of the high-pressure gas well simply, safely, efficiently and at low cost.
The invention provides a shaft blockage removing method of a high-pressure gas well, which comprises the following steps:
injecting working fluid into the well bore for acidizing treatment;
perforating the oil pipe;
and carrying out open flow treatment on the high-pressure gas well.
The method for removing the blockage of the wellbore of the high-pressure gas well, wherein before the perforating treatment is performed on the oil pipe, the method further comprises the following steps:
and carrying out drifting treatment on the well bore after the acidizing treatment.
The method for removing the blockage of the wellbore of the high-pressure gas well, wherein before the injecting the working fluid into the wellbore for acidizing, the method further comprises the following steps:
determining the working fluid according to the blockage removing parameters of the shaft;
wherein the blockage removing parameters at least comprise production thickness, stratum parameters and tubular column structure parameters.
The method for removing the blockage of the wellbore of the high-pressure gas well comprises the steps that the working fluid at least comprises a first amount of acid liquid, a second amount of pad fluid, a third amount of post fluid and a fourth amount of displacement fluid.
The method for removing the blockage of the wellbore of the high-pressure gas well, wherein the drifting treatment comprises the following steps:
and a drift diameter gauge is lowered into the well bore to the position below the perforation of the oil pipe.
The method for removing the blockage of the wellbore of the high-pressure gas well, wherein after the perforating treatment is performed on the oil pipe, the method further comprises the following steps:
and closing the high-pressure gas well.
The method for removing the blockage of the shaft of the high-pressure gas well, wherein the formation fluid sprayed by the open flow treatment is subjected to oil-gas-water separation treatment.
The invention also provides a shaft blockage removing device of the high-pressure gas well, which comprises:
the injection unit is used for injecting working fluid into the well shaft for acidizing treatment;
the first processing unit is used for carrying out perforation processing on the oil passing pipe;
and the control unit is used for carrying out open flow treatment on the high-pressure gas well.
The apparatus as described above, wherein a second processing unit is further included;
the second processing unit is used for carrying out drifting processing on the well shaft after the acidizing processing.
The device comprises an injection unit, a pressure control unit and a control unit, wherein the injection unit comprises an acidizing and fracturing pump truck, an acid liquor tank truck, a front tank truck, a rear tank truck and a displacement tank truck;
the acid liquor tank truck, the front tank truck, the rear tank truck and the displacement tank truck are respectively communicated with the acidizing fracturing pump truck.
The invention provides a shaft blockage removing method and device for a high-pressure gas well, in particular to a shaft acid solution blockage removing method for a high-pressure gas well, which is based on oil pipe perforation to increase the oil drainage area, and can realize the shaft blockage removing method by increasing the oil drainage area of the high-pressure gas well through the oil pipe perforation technology on the basis of the conventional acidification blockage removing process so as to recover and improve the single-well productivity. Specifically, acid liquor is firstly conducted on the high-pressure blocked gas well for deblocking, the acid liquor enters the high-temperature and high-pressure stratum and then fully reacts with a shaft and a stratum blockage, and then the oil pipe is perforated and then open-flow production is conducted.
The method not only can greatly prolong the contact reaction time of the acid liquor with the shaft and the stratum blockage, effectively improve the flow passage of the fluid, but also can greatly increase the oil drainage area of the high-pressure gas well through the oil pipe perforation technology, thereby obviously improving the productivity of the high-pressure gas well in a safe, efficient and low-cost mode.
Drawings
FIG. 1 is a flow diagram of one embodiment of a method of plugging a wellbore of a high pressure gas well of the present invention;
FIG. 2 is a flow chart of yet another embodiment of a method of plugging a wellbore in a high pressure gas well of the present invention;
FIG. 3 is a flow chart of yet another embodiment of a method of plugging a wellbore in a high pressure gas well of the present invention;
FIG. 4 is a flow chart of yet another embodiment of a method of plugging a wellbore in a high pressure gas well of the present invention;
FIG. 5 is a schematic diagram of an embodiment of a wellbore unblocking apparatus for a high pressure gas well according to the present invention;
FIG. 6 is a schematic diagram of a wellbore unblocking apparatus for a high pressure gas well according to yet another embodiment of the present invention;
FIG. 7 is a schematic diagram of a wellbore unblocking apparatus for a high pressure gas well according to yet another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a wellbore unblocking apparatus for a high-pressure gas well according to still another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The high-pressure gas well in the invention refers to a gas well with the wellhead pressure of more than 70MPa and the bottom hole pressure of more than 105 MPa.
Fig. 1 is a flow chart of an embodiment of a method of plugging a wellbore in a high pressure gas well according to the present invention. As shown in fig. 1, the method for removing the blockage of the wellbore of the high-pressure gas well in the embodiment includes the following steps:
s101: and injecting working fluid into the well bore for acidizing.
The working fluid of this embodiment at least includes an acid solution, a pad fluid, a post fluid, and a displacement fluid.
Specifically, the working fluid is not a mixture of an acid solution, a pad fluid, a post fluid and a displacement fluid, but the acid solution, the pad fluid, the post fluid and the displacement fluid are respectively placed in different containers and are respectively injected into the wellbore, so that the wellbore blockage can be corroded and unblocked. Injecting the working fluid comprises sequentially injecting a pad fluid, an acid fluid, a post fluid and a displacement fluid into the wellbore.
In the invention, the "acid liquid" refers to an acidic liquid having a good dissolution and corrosion effect on wellbore plugs and carbonate rocks, and the "pad liquid", "post-pad liquid" and "displacement liquid" can be inert liquids and can also contain a proper amount of acid components. The term "inert liquid" is understood to mean a liquid which does not participate in the acid erosion reaction of the plug and is inert to the plug to be treated. The "pre-fluid", "post-fluid" and "displacing fluid" are names assigned according to the construction operation procedure and action, and their constituent components may be the same or different.
In one embodiment of the process of the present invention, the pre-fluid, post-fluid and/or displacement fluid may be the same composition, thereby reducing the inert fluid types and facilitating formulation. Slickwater may also be used as a pad/pad, and/or displacement fluid in practice.
In the method, before the pad fluid is injected into the oil pipe of the wellhead of the well bore, the pump injection pipeline of the wellhead is subjected to pressure test, so that the sealing performance of the working fluid injection path is determined. The pump injection pipeline can be a pressure pipeline, and the pressure of the pump injection pipeline can be tested according to the pressure resistance of the pressure pipeline, such as 95MPa or 115MPa, and the pressure is stabilized for 5min until the pressure is qualified.
The same as the conventional operation of acidification blockage removal construction, the trial extrusion is necessary before formal implementation, and if the situation that liquid (pre-liquid) cannot enter the extrusion is found in the trial extrusion, the operation is stopped firstly for corresponding treatment. The whole operation process needs to pay close attention to and strictly control the pressure of the oil sleeve, and the balance pressure is adjusted according to the oil pressure on site.
When injecting acid liquor, injecting the acid liquor into the shaft for one time or multiple times according to the shaft and stratum blockage conditions; when the post fluid is injected, the post fluid is extruded after the construction pressure and the discharge capacity are controlled; when the displacing liquid is injected, the acid liquid and the postposition liquid are extruded into the stratum and the position below the packer.
In the above-mentioned trial extrusion process, for example, the trial extrusion speed of the pad fluid may be 0.5 to 2m3The injection speed of the acid solution, the post-positioned liquid and the displacing liquid can be 0.5-1m3/min。
S102: and (4) perforating the oil passing pipe.
And after the acidification treatment is finished, perforating the underground oil pipe.
Through carrying out perforation treatment at the oil pipe, can increase the draining area, improve the volume that oil gas unit interval got into oil pipe to be favorable to improving the productivity of pit shaft.
In addition, during the perforation treatment, the reaction of the working fluid and the wellbore plugging can be more sufficient, and the efficient erosion of the wellbore plugging can be facilitated.
Before the perforation treatment, the cable used in the perforation treatment needs to be checked to avoid the occurrence of complex situations. Also, to ensure that the perforation location is accurate, it is necessary to use magnetic positioning to correct the depth prior to the perforation process.
In one embodiment, the perforating bullet has an outer diameter of 51mm, a pressure resistance of 120MPa or more, a temperature resistance of 150 ℃/2h, and a pore density of 10 pores/meter.
S103: and (4) performing open flow treatment on the high-pressure gas well.
After the acidizing and the perforating are finished, because the blockage of the shaft is efficiently corroded and the oil drainage area is further optimized, the underground fluid can be discharged to the ground for collection and treatment by controlling the gas production wellhead throttling valve.
The shaft blockage removing method of the high-pressure gas well can increase the oil drainage area of the high-pressure gas well through an oil pipe perforation technology on the basis of the conventional acidification blockage removing process so as to recover and improve the single-well productivity. The method not only can greatly prolong the contact reaction time of the acid liquor with the shaft and the stratum blockage, effectively improve the flow passage of the fluid, but also can greatly increase the oil drainage area of the high-pressure gas well through the oil pipe perforation technology, thereby obviously improving the productivity of the high-pressure gas well in a safe, efficient and low-cost mode.
Fig. 2 is a flow chart of yet another embodiment of a method of unblocking a wellbore of a high pressure gas well of the present invention.
As shown in fig. 2, the method for removing wellbore blockage of a high-pressure gas well according to this embodiment further includes, before S102:
s201: and (4) carrying out drifting treatment on the acidized shaft.
Specifically, S201 described above is between S101 and S102.
After the acidizing treatment is finished, the blocking object in the shaft is corroded and loosened to a certain degree, the shaft which is subjected to acidizing treatment can be subjected to shaft dredging treatment before the shaft is subjected to perforation treatment, so that the blocking in the shaft is removed to a certain degree, a tool for perforation treatment, such as a perforator of an oil pipe, can be conveniently put into the shaft to be perforated, and the smooth perforation treatment is ensured.
In one embodiment, the master gate may be opened and the drift gauge may be lowered into the wellbore to below the perforation of the flow tube, specifically, the drift gauge may be tripped out after the drift gauge is tripped to 10m below the perforation location.
Fig. 3 is a flow chart of yet another embodiment of a method for unblocking a wellbore of a high pressure gas well of the present invention.
As shown in fig. 3, the method for removing wellbore blockage of a high-pressure gas well according to this embodiment further includes, for example, before S101 in fig. 2:
s301: and determining the working fluid according to the blockage removing parameters of the shaft.
Wherein the blockage removing parameters at least comprise production thickness, stratum parameters and tubular column structure parameters.
Specifically, the respective formulas and respective amounts of the acid liquid, the pad fluid, the post fluid and the displacement fluid can be determined according to the plugging removal parameters such as the production thickness, the stratum parameters and the tubular column structure parameters. In a specific embodiment, the acid solution, the pad solution, the post solution and the displacement solution are respectively formulated as follows, wherein the acid solution is used in a first amount, the pad solution is used in a second amount, the post solution is used in a third amount, and the displacement solution is used in a fourth amount.
TABLE 1
Fig. 4 is a flow chart of yet another embodiment of a method of unblocking a wellbore of a high pressure gas well of the present invention.
In order to ensure the unblocking effect of the acidizing treatment, on the basis of the above embodiment, for example, after S102 of fig. 2, the method further includes:
s401: and closing the high-pressure gas well.
Specifically, S401 is between S102 and S103.
In the method of this embodiment, after the perforation treatment is finished, the well is shut in for a period of time, for example, the well is shut in for 0.5h to 6h, and the erosion of the wellbore plug by the acid solution is completed. Then the well can be opened and the production can be obtained by open flow. In theory, the control of the shut-in time is based on the completion of the corrosion reaction, and the shut-in can be maintained until the next production is required to start.
After the open flow treatment, the invention also comprises the steps of carrying out oil-gas-water separation treatment on the formation fluid sprayed by the open flow treatment, inputting the gas phase obtained by separation into a gas collecting pipeline, inputting the oil phase obtained by separation into an oil collecting pipeline, and inputting the water phase obtained by separation into a sewage treatment device.
The invention also provides a shaft blockage removing device of the high-pressure gas well, which is used for performing any shaft blockage removing method of the high-pressure gas well.
Fig. 5 is a schematic structural diagram of an embodiment of the wellbore unblocking apparatus for a high-pressure gas well according to the present invention.
As shown in fig. 5, the wellbore unblocking apparatus for a high-pressure gas well of the present embodiment includes:
the injection unit 1 is used for injecting working fluid into the shaft to carry out acidizing treatment;
the first processing unit 2, the first processing unit 2 is used for perforating the oil pipe;
and the control unit 3 is used for carrying out open flow treatment on the high-pressure gas well.
The apparatus of this embodiment may correspondingly execute the method embodiment shown in fig. 1, and the implementation principle and the technical effect thereof are the same, which are not described herein again.
Fig. 6 is a schematic structural diagram of a wellbore unblocking apparatus for a high-pressure gas well according to still another embodiment of the present invention.
As shown in fig. 6, on the basis of the above embodiment, the wellbore unblocking apparatus for a high-pressure gas well of this embodiment further includes a second processing unit 4, where the second processing unit 4 is configured to perform a drifting process on the wellbore after the acidizing process.
The apparatus of this embodiment may correspondingly execute the method embodiment shown in fig. 2, and the implementation principle and the technical effect thereof are the same, which are not described herein again.
Fig. 7 is a schematic structural diagram of a wellbore unblocking apparatus for a high-pressure gas well according to still another embodiment of the present invention.
As shown in fig. 7, the injection unit 1 comprises an acidizing fracturing pump truck 11, an acid tank truck 12, a front tank truck 13, a rear tank truck 14 and a displacement tank truck 15;
the acid liquor tank truck 12, the front tank truck 13, the rear tank truck 14 and the displacement tank truck 15 are respectively communicated with the acidizing and fracturing pump truck 11.
The acidizing and fracturing pump truck 11 is communicated with the acid tank truck 12, the front tank truck 13, the rear tank truck 14 and the displacement tank truck 15 respectively and is used for independently injecting acid liquid in the acid tank truck 12, the front liquid in the front tank truck 13, the rear liquid in the rear tank truck 14 and the displacement liquid in the displacement tank truck 15 into the shaft.
The capacities of the acid tank truck 12, the front tank truck 13, the rear tank truck 14 and the displacement tank truck 15 can be independently selected from 10-100m3And the specific number of each tanker is not limited.
In addition, fig. 7 also includes a dropping plug and a ball seat.
Fig. 8 is a schematic structural diagram of a wellbore unblocking apparatus for a high-pressure gas well according to still another embodiment of the present invention.
Fig. 8 is an apparatus for perforating a wellbore unblocking apparatus for a high pressure gas well of the present invention. After the acidizing is finished, the blowout pipeline is connected, the blowout pipeline is fixed according to the specification, the pressure test is qualified, after an ignition device is prepared according to the specification at the outlet of the blowout pipeline, corresponding perforating equipment is installed according to a figure 8, then the perforator for perforating the oil pipe is put down, and the perforating position is determined according to the actual production requirement (attention is paid to avoiding the oil pipe coupling).
Therefore, when the shaft of the high-pressure gas well is unplugged, the working fluid is firstly injected into the shaft according to the device shown in fig. 7, namely, under the action of the acidizing fracturing pump truck 11, the acid fluid, the pad fluid, the post fluid and the displacing fluid are respectively injected into the high-pressure gas well through the gas production tree, after the injection is finished, the cable, the high-pressure sealing grease pump, the crown block, the sealing control head, the blowout prevention pipe, the magnetic positioning device, the manual anti-falling device, the cable blowout preventer, the paraffin removal valve, the cable cap, the weighting device, the pressure safety explosion prevention device, the oil pipe perforator and the like are installed on the base shown in fig. 7 according to the device shown in fig. 8, the blowout is carried out after the shaft is closed for a period of time, the blowout product is separated by the oil-gas-water separator which firstly enters the gas-phase gas-water separation pipeline, the oil-phase which is produced after the separation enters the oil-water separation pipeline through the oil-phase outlet of the oil-gas-water separator, the oil-water separation pipeline, The water phase generated after separation enters a sewage treatment device through a water phase outlet of the oil-gas-water separator.
The method for removing the blockage of the well bore of the high-pressure gas well is described by specific embodiments.
During production, the oil pressure output is continuously reduced due to the blockage of a shaft of a high-pressure gas well, before the acidizing blockage removal construction of the shaft is ended, the oil pressure of the well is 12.6MPa, and the daily natural gas is 31 multiplied by 104m3。
The wellbore was deblocked as follows.
1. Determining a liquid preparation according to the production thickness, the stratum parameters and the tubular column structure parameters: 35m of prepartion pad fluid330m of postposition liquid3Displacing liquid 25m360m of acid liquor3，
The acid liquor formula comprises: 8.0% HCl + 1.0% thickener + 1.0% demulsifier + 1.0% cleanup additive + 2.0% corrosion inhibitor + 1.0% iron ion stabilizer + 0.5% conditioner + wellsite water;
the formula of the pad fluid is as follows: 2.0% corrosion inhibitor, 2.0% iron ion stabilizer, 2.0% clay stabilizer, 1.0% demulsifier, 3.0% acidification synergist, 15.0% waterproof locking agent and well site water;
the formula of the postposition liquid is as follows: 2.0% corrosion inhibitor, 2.0% iron ion stabilizer, 2.0% clay stabilizer, 1.0% demulsifier, 3.0% acidification synergist, 15.0% waterproof locking agent and well site water;
the formula of the displacement liquid is as follows: 1.0% of drag reducer, 0.5% of demulsifier, 1.0% of cleanup additive, 0.1% of bactericide, 1.0% of anti-swelling agent, 5.0% of waterproof locking agent and well site water;
2. the devices are connected according to fig. 7;
3. connecting a ground construction pipeline, and testing the pressure of the high-pressure pipeline to 95MPa and stabilizing the pressure for 5min until the high-pressure pipeline is qualified;
4. 35m of pre-extrusion liquid3Determining the subsequent operation development condition according to the trial extrusion condition;
5. low squeezing acid liquor 60m3Injecting acid liquor for two times according to the blockage conditions of a shaft and a stratum on average;
6. low-extrusion postposition liquid 30m3Controlling construction pressure and discharge capacity to squeeze in post-positioned liquid;
7. low-extrusion displacement liquid 25m3Extruding the acid solution and the postposition solution into the stratum and the position below the packer;
8. dredging a well: and closing the gas production wellhead main brake, installing a wellhead blowout prevention pipe, and testing the pressure to be qualified. Opening a main gate, putting down a drift diameter gauge drift to 10m below the perforation position, and pulling out the drift diameter gauge;
9. connecting a blowout pipeline: connecting a blowout pipeline, fixing according to the specification, and testing the pressure to be qualified; preparing an ignition device at the outlet of the blowout pipeline according to the specification;
10. after connecting a tool for performing a piercing process as shown in fig. 8 to the apparatus shown in fig. 7, the lower tubing punch performs a tubing piercing operation;
11. open flow and liquid drainage: and after the acid rock reaction is finished, controlling blowout by adopting a gas production wellhead throttle valve, timely switching to a production flow according to the discharge condition of the well killing fluid, and enabling the blowout to enter a gas-liquid separator for oil-gas-water separation.
In the above process, the injection speed of the pad fluid is 0.5-2m3Fluctuating within/min, and injecting acid liquid, postposition liquid and displacing liquid at 0.5-1m3Fluctuating within/min.
After the shaft blockage removing construction is carried out according to the method, the construction pump pressure is reduced by 30MPa, and the blockage removing effect is obvious; after acidizing and blockage removing construction of a shaft, the oil pressure is 59MPa, and the daily generated gas is 61 multiplied by 104m3The oil pressure output is stable, and the productivity is successfully recovered.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for removing blockage of a shaft of a high-pressure gas well is characterized by comprising the following steps:
injecting working fluid into the well bore for acidizing treatment;
perforating the oil pipe;
and carrying out open flow treatment on the high-pressure gas well.
2. The method of unblocking a wellbore in a high pressure gas well as recited in claim 1, further comprising, prior to the perforating the tubing, the steps of:
and carrying out drifting treatment on the well bore after the acidizing treatment.
3. The method for removing the blockage in the well bore of the high-pressure gas well as recited in claim 1 or 2, wherein before the injecting the working fluid into the well bore for acidizing, the method further comprises the following steps:
determining the working fluid according to the blockage removing parameters of the shaft;
wherein the blockage removing parameters at least comprise production thickness, stratum parameters and tubular column structure parameters.
4. The method of claim 1 or 3, wherein the treatment fluid comprises at least a first amount of acid, a second amount of pad fluid, a third amount of pad fluid, and a fourth amount of displacement fluid.
5. The method of unblocking a wellbore of a high pressure gas well as recited in claim 2, wherein the drifting process comprises:
and a drift diameter gauge is lowered into the well bore to the position below the perforation of the oil pipe.
6. The method for removing the blockage in the shaft of the high-pressure gas well as recited in claim 1 or 2, wherein after the perforating treatment is performed on the oil pipe, the method further comprises the following steps:
and closing the high-pressure gas well.
7. The method of claim 1 or 6, wherein the formation fluid from the blowout treatment is subjected to oil-gas-water separation.
8. An apparatus for performing the method of unblocking a wellbore of a high pressure gas well as defined in any one of claims 1-7, comprising:
the injection unit is used for injecting working fluid into the well shaft for acidizing treatment;
the first processing unit is used for carrying out perforation processing on the oil passing pipe;
and the control unit is used for carrying out open flow treatment on the high-pressure gas well.
9. The apparatus of claim 8, further comprising a second processing unit;
the second processing unit is used for carrying out drifting processing on the well shaft after the acidizing processing.
10. The apparatus of claim 8, wherein the injection unit comprises an acid frac pump truck, an acid tanker truck, a front tanker truck, a rear tanker truck, a displacement tanker truck;
the acid liquor tank truck, the front tank truck, the rear tank truck and the displacement tank truck are respectively communicated with the acidizing fracturing pump truck.
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