CN113638717A - Low-pressure low-yield well drainage gas recovery method - Google Patents
Low-pressure low-yield well drainage gas recovery method Download PDFInfo
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- CN113638717A CN113638717A CN202111071832.9A CN202111071832A CN113638717A CN 113638717 A CN113638717 A CN 113638717A CN 202111071832 A CN202111071832 A CN 202111071832A CN 113638717 A CN113638717 A CN 113638717A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000011084 recovery Methods 0.000 title claims description 8
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 claims abstract description 45
- 238000005086 pumping Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims description 57
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 238000003860 storage Methods 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 5
- 239000000443 aerosol Substances 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000010924 continuous production Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 4
- 230000007420 reactivation Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Classifications
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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
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a water drainage and gas production method for a low-pressure and low-yield well, which comprises the steps of selecting a target well, draining liquid, producing gas and stably producing gas; wherein the gas production utilizes negative pressure pumping, and simultaneously comprises liquid discharge by matching oil pipe pumping and casing pressure compensation processes; by improving the liquid discharge method, the invention can solve the mechanical accidents and potential safety hazards in the traditional mechanical swabbing process and also solve the problems of low mechanical swabbing efficiency, environmental pollution and the like; meanwhile, the method can restore the production of the flooded production-stop gas well, ensure the continuous production and stable production of the accumulated liquid production-reducing gas well and restore the production of the flooded production-stop gas well.
Description
Technical Field
The invention relates to the field of natural gas exploitation, in particular to a drainage gas production method for a low-pressure low-yield well.
Background
Along with the increase of the development time of the oil-gas field, the formation pressure of the oil-gas field is decreased progressively, the gas flow rate of the gas well is decreased gradually, and the liquid carrying capacity is reduced; causing frequent flooding of the low pressure well. The formation pressure causes that the new well can not naturally flow and discharge liquid and normally produce; the liquid is gradually accumulated in the old well and the near well area, the seepage passage is blocked, the gas and water yield is rapidly decreased, even the liquid locks the gas production layer, the well is flooded and the production is stopped finally, and the continuous exploitation difficulty of the gas field is increased.
At present, drainage and gas production are mainly mechanical swabbing, and the main problems of the drainage and gas production are as follows:
1. mechanical potential safety hazards of the steel wire rope;
2. pollution of sewage environment;
3. the pumping time is long, and the efficiency is low;
4. the drawing depth can not reach the liquid discharge requirement.
Disclosure of Invention
Therefore, in order to solve the above-mentioned deficiencies, the present invention provides a method for gas production in a natural gas well, which can solve the mechanical accidents and potential safety hazards in the conventional mechanical pumping process, and solve the problems of low mechanical pumping efficiency, environmental pollution, etc. by improving a liquid discharge method; meanwhile, the method can restore the production of the flooded production-stop gas well, ensure the continuous production and stable production of the accumulated liquid production-reducing gas well and restore the production of the flooded production-stop gas well.
The invention is realized by constructing a method for producing gas by draining water from a low-pressure low-yield well, comprising the following steps,
step one, selecting a target well;
step two, draining liquid;
step three, gas production;
step four, gas recovery is stabilized;
the second step adopts negative pressure pumping and comprises the following two steps;
pumping the oil pipe;
the liquid in the oil pipe is vaporized in vacuum by using a vacuum device to form partial aerosol, so that the flow speed is increased, the pressure difference is increased, and the liquid carrying capacity is improved; connecting an external vacuum pumping system with an oil pipe through a wellhead, arranging two storage tanks between a vacuum pump and the oil pipe, wherein one storage tank is used for performing vacuum pumping on water in the oil pipe, and reducing a liquid column of the oil pipe; the other storage tank utilizes a vacuum pump to carry out negative pressure pumping, and the two storage tanks are alternately used; and an absolute pressure of 3KPa is generated in the oil pipe.
Sleeve pressure supplementing;
pressurizing the interior of the sleeve by using a supercharger to ensure that the pressure in the sleeve and the pressure in the oil pipe are in a balanced state, so as to supplement the liquid carrying capacity in the oil pipe; an externally-connected membrane nitrogen production supercharger is connected with a casing through a wellhead, the supercharger slowly injects nitrogen into the casing, and controls the pressure and flow of the nitrogen, so that accumulated liquid in a well is discharged in an optimal state, meanwhile, the stratum is not restrained and damaged, and the gas-water flow state of the stratum is not damaged; the maximum injection pressure in the process is 35 MPa.
The invention has the following advantages:
the process disclosed by the invention not only solves the mechanical accidents and potential safety hazards in the mechanical pumping process, but also solves the problems of low mechanical pumping efficiency, environmental pollution and the like; the liquid is discharged by oil pipe pumping and casing pressure compensation, so that the special requirements of gas well drainage and gas production can be met, the stratum energy is activated, the stratum is not damaged, and the drainage and gas production process conforms to the gas and water flow rule of the stratum of the water-containing natural gas reservoir.
Meanwhile, the method can not only ensure the reactivation and production recovery of the flooded production-stop gas well, but also ensure the continuous production and stable production of the accumulated liquid production-reduction gas well, and ensure the reactivation and production recovery of the flooded production-stop gas well.
Drawings
FIG. 1 is a process diagram of the present invention;
FIG. 2 is a schematic view of the tubing pumping process of the present invention;
fig. 3 is a schematic view of the casing pressure-compensating process of the present invention.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 3, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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 invention provides a method for producing gas by discharging water from a low-pressure low-production well, which comprises the following steps,
(1) and selecting a target well, and selecting a new fracturing well or an old well flooded by stopping production.
(2) And (2) discharging liquid, namely discharging liquid in the well by adopting vacuum liquid discharge and effervescent liquid discharge (oil pipe pumping refers to vacuum suction liquid discharge, and the effervescent liquid discharge refers to the liquid discharge purpose achieved by carrying gas and liquid after bubbling and overturning underwater in the nitrogen pressurization gas injection process).
(3) Gas production is carried out by means of an external gas production system.
(4) And (4) stabilizing gas production, and taking measures for ensuring the stability of gas production, such as effervescent liquid discharge, circulating gas lift, pressurized mixed transportation, recycling and reinjection and the like.
The step (2) adopts negative pressure pumping and comprises the following two steps;
(2-1) oil pipe pumping;
the liquid in the oil pipe is vaporized in vacuum by using a vacuum device to form partial aerosol, so that the flow speed is increased, the pressure difference is increased, and the liquid carrying capacity is improved;
(2-2) sleeve pressure supplementing;
the pressure booster is used for boosting the pressure in the sleeve, so that the pressure in the sleeve and the pressure in the oil pipe are in a balanced state, and the liquid carrying capacity in the oil pipe is supplemented.
As shown in fig. 2, in this embodiment, the specific operation method of step (2-1) is to connect an external vacuum pumping system to the oil pipe through a wellhead, and two storage tanks are arranged between the vacuum pump and the oil pipe, wherein one of the storage tanks performs vacuum pumping on water in the oil pipe to reduce a liquid column of the oil pipe; the other storage tank utilizes a vacuum pump to carry out negative pressure pumping, and the two storage tanks are alternately used;
and the absolute pressure in the oil pipe is 3KPa (the boiling point of water is 24.4 ℃), gas-liquid two-phase atomized aerosol fluid is formed at the upper part of the oil pipe, the flow rate of an oil pipe outlet is increased, the liquid column load of the oil pipe is reduced, the flow rate of liquid carrying is increased, accumulated liquid in the oil pipe can be rapidly discharged, particularly, the critical liquid carrying capacity of the gas well is rapidly improved at the initial stage of the gas well in a flooding shutdown state, and the production of the gas well is recovered.
In this process, the minimum absolute pressure: 0.2 KPa;
maximum flow rate: 15 m/s;
maximum water flow: 120m3/h；
Wherein the pumping time of the new well is 4 days;
the flow rate is 200m3/h。
As shown in fig. 3, in this embodiment, the specific operation method in step (2-2) is to connect an external membrane nitrogen production booster with the casing through the wellhead, and the booster slowly injects nitrogen into the casing, and controls the pressure and flow rate of nitrogen, so that the accumulated liquid in the well is discharged in an optimal state, and simultaneously, the accumulated liquid is not restrained and damaged on the formation, and the flow state of formation gas and water is not damaged.
During the injection of gas into the sleeve:
the gas injection pressure depends on the well depth structure, the formation pressure and the depth of the accumulated liquid, the gas injection pressure of the membrane nitrogen production compressor needs to be changed in a large range, generally, in the initial stage of the complex production operation, the membrane nitrogen production compressor is continuously in a very high pressure state, the pressure is reduced along with the discharge of the accumulated liquid and the release of the formation energy, the pressure is gradually kept in a reasonable pressure difference with the oil pressure (output pressure), and the gas injection pressure changes about 5 times (namely, the ratio of the pressure of the pressurization area of the sleeve to the height difference of the liquid level, the adjustable range is 4-6 times, preferably 5 times.)
The flow rate of nitrogen is a leading factor of liquid carrying capacity, but the larger natural gas injection flow rate is maintained, although accumulated liquid in a well can be discharged in a short time, the stratum gas and water flow state can be damaged, and the stratum is damaged, so that the accumulated liquid in the well can be discharged step by ensuring the sufficient liquid carrying capacity of the nitrogen, the stratum water lock of a near well area can be released, the stratum energy is activated, the injected gas amount does not cause depression and damage to the stratum, the stratum gas and water flow state is not damaged, and the nitrogen injection amount must be coordinated and controlled in time to quickly recover the gas well production; when injecting nitrogen, the adjustable range of the injected nitrogen amount should be 4-6 times, preferably 5 times.
The invention not only solves the mechanical accident and potential safety hazard in the mechanical swabbing process, but also solves the problems of low mechanical swabbing efficiency, environmental pollution and the like; the liquid is discharged by oil pipe pumping and casing pressure compensation, so that the special requirements of gas well drainage and gas production can be met, the stratum energy is activated, the stratum is not damaged, and the drainage and gas production process conforms to the gas and water flow rule of the stratum of the water-containing natural gas reservoir. Meanwhile, the method can not only ensure the reactivation and production recovery of the flooded production-stop gas well, but also ensure the continuous production and stable production of the accumulated liquid production-reduction gas well, and ensure the reactivation and production recovery of the flooded production-stop gas well.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. A method for water drainage and gas recovery of a low-pressure low-yield well comprises the following steps,
(1) selecting a target well;
(2) draining;
(3) gas production;
(4) stably gas production;
the method is characterized in that: the step (2) adopts negative pressure pumping and comprises the following two steps;
(2-1) oil pipe pumping;
the liquid in the oil pipe is vaporized in vacuum by using a vacuum device to form partial aerosol, so that the flow speed is increased, the pressure difference is increased, and the liquid carrying capacity is improved;
(2-2) sleeve pressure supplementing;
the pressure booster is used for boosting the pressure in the sleeve, so that the pressure in the sleeve and the pressure in the oil pipe are in a balanced state, and the liquid carrying capacity in the oil pipe is supplemented.
2. The low-pressure low-yield well drainage gas production method according to claim 1, characterized by comprising the following steps: the specific operation method of the step (2-1) is that an external vacuum pumping system is connected with an oil pipe through a well mouth, two storage tanks are arranged between a vacuum pump and the oil pipe, wherein one storage tank is used for performing vacuum pumping on water in the oil pipe, and the liquid column of the oil pipe is reduced; the other storage tank utilizes a vacuum pump to carry out negative pressure pumping, and the two storage tanks are alternately used;
and an absolute pressure of 3KPa is generated in the oil pipe.
3. A low pressure low producing well drainage gas production method according to claim 1 or 2, characterized in that: the specific operation method of the step (2-2) is that an external membrane nitrogen production supercharger is connected with the casing through a wellhead, the supercharger slowly injects nitrogen into the casing, and controls the pressure and flow of the nitrogen, so that accumulated liquid in the well is discharged in the optimal state, meanwhile, depression and damage to the stratum are not caused, and the gas-water flow state of the stratum is not damaged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111071832.9A CN113638717A (en) | 2021-09-14 | 2021-09-14 | Low-pressure low-yield well drainage gas recovery method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111071832.9A CN113638717A (en) | 2021-09-14 | 2021-09-14 | Low-pressure low-yield well drainage gas recovery method |
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| CN202111071832.9A Pending CN113638717A (en) | 2021-09-14 | 2021-09-14 | Low-pressure low-yield well drainage gas recovery method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114622873A (en) * | 2022-03-14 | 2022-06-14 | 重庆非常规油气研究院有限公司 | Shale gas well production stage dividing method |
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2021
- 2021-09-14 CN CN202111071832.9A patent/CN113638717A/en active Pending
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Application publication date: 20211112 |