CN114622873A - Shale gas well production stage dividing method - Google Patents
Shale gas well production stage dividing method Download PDFInfo
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- CN114622873A CN114622873A CN202210247671.2A CN202210247671A CN114622873A CN 114622873 A CN114622873 A CN 114622873A CN 202210247671 A CN202210247671 A CN 202210247671A CN 114622873 A CN114622873 A CN 114622873A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 238000005086 pumping Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004576 sand Substances 0.000 claims abstract description 7
- 238000005065 mining Methods 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 79
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003345 natural gas Substances 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000010924 continuous production Methods 0.000 description 3
- 230000000035 biogenic effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000003860 storage Methods 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
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- General Life Sciences & Earth Sciences (AREA)
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- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a method for dividing production stages of shale gas wells, and relates to the technical field of natural gas exploitation. The invention comprises the following steps: step 1: obtaining production data and related data of a gas well; step 2: judging the production mode of the gas well, and dividing the production stage of the gas well; and step 3: comprises a drainage and mining stage, a sand production stage, a self-spraying production stage and a pumping pressurization stage; and 4, step 4: the production in the pumping and pressurizing stage is kept continuous and stable, the descending speed is low, the gas is mainly produced, the gas is changed into a continuous phase, the water yield is stably reduced, and the whole body is at a lower level; and 5: the gas-liquid ratio tends to be stable along with the change of the gas production rate, and the final collected and stored quantity is judged; step 6: and completing the production stage division of the shale gas well. The method for dividing the production stage of the shale gas well provided by the invention has the advantages that the technological progress is utilized, the production stage is reasonably divided, the production stability of the shale gas well is improved, and the gas production rate and the gas reservoir recovery ratio of a single well are improved.
Description
Technical Field
The invention relates to the technical field of natural gas exploitation, in particular to a method for dividing production stages of shale gas wells.
Background
The shale gas is natural gas which is rich in organic matters, matured dark shale or high-carbon shale, stores and preserves biogenic and pyrolytic causative factors with certain commercial values and mixed causative factors of the biogenic and the pyrolytic causative factors due to the adsorption effect of the organic matters or the existence of cracks and matrix pores in the rock, is unconventional natural gas in a storage rock system mainly based on the organic-rich shale, is continuously generated biochemical causative gas, thermal causative gas or the mixture of the biochemical causative gas and the thermal causative gas, can exist in the natural cracks and pores in a free state, exists on the surfaces of kerogen and clay particles in an adsorption state, and is stored in the kerogen and the asphaltene in a very small amount in a dissolved state, wherein the proportion of the free gas is generally 20-85%;
compared with the conventional gas well production dynamic characteristics, the shale gas well seepage characteristics, the yield decrement characteristics and the production characteristics show staged change and partition difference. The theory of principle research has developed shale gas field gas well production stage division and dynamic characteristic description research: under the condition of adopting dynamic reasonable production allocation, the shale gas field gas well divides the production process into two large and three small production stages, namely a fixed-production depressurization stage and a fixed-pressure depressurization stage according to the yield and pressure decreasing characteristics, wherein the fixed-pressure depressurization stage is further divided into continuous natural decreasing, intermittent production, discharge and extraction or pressurization auxiliary production stages. The fixed production depressurization stage mainly describes a gas well pressure decreasing rule along with the accumulated production, the accumulated gas yield of the stable production stage, a gas well pressure decreasing rule along with the production time and the stable production time, the continuous natural decrement production stage mainly describes a decrement type, a decrement rate along with the time or the accumulated production and the accumulated time of the continuous natural decrement production stage, the intermittent production stage mainly describes an average yield decrement rate of an open period, intermittent production efficiency and an effective period of intermittent production, and the drainage and extraction process or the pressurized extraction auxiliary production stage mainly describes the opportunity of intervening drainage and extraction or the pressurized process, the measure gas yield increase and the yield decrement rate after the measure;
the original division stage basis of the shale gas well production stage is as follows: dividing a plurality of stages in the gas well production stage according to a pressure decreasing rule and dynamic characteristics corresponding to the gas well production stage until the gas well life is finished; with the progress of a new process and the progress of the advancement of a production tool, the application of a trial production integrated tool, a sand production process and a suction booster pump changes the relevant rule of pressure decrement prediction or yield decrement prediction in a yield decrement stage, a plurality of different stable yield stages are correspondingly obtained, and the current dividing mode of the production stage of the shale gas well has limitation; therefore, a method for dividing the production stage of the shale gas well is provided.
Disclosure of Invention
The invention aims to provide a method for dividing production stages of shale gas wells, and solves the problems in the background.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a method for dividing production stages of shale gas wells, which comprises the following steps:
step 1: acquiring production data of a gas well, and acquiring relevant data of the gas well according to the production data of the gas well;
step 2: judging the production mode of the gas well according to the related data of the gas well, and dividing the production stage of the gas well at the same time;
and step 3: the production stage of the step 2 comprises a drainage and mining stage, a sand production stage, a self-spraying production stage and a pumping pressurization stage;
and 4, step 4: the production in the pumping and pressurizing stage is kept continuous and stable, the descending speed is low, the gas is mainly produced, the gas is changed into a continuous phase, the water yield is stably reduced, and the whole body is at a lower level;
and 5: based on the steps, the gas-liquid ratio tends to be stable along with the change of the gas production rate, and the final collected and stored quantity is judged;
and 6: and completing the production stage division of the shale gas well.
In the pumping and pressurizing stage in the step 3, a gas-liquid mixed conveying pumping booster pump and a negative pressure pumping pump are adopted;
the gas-liquid mixed transportation pumping booster pump reduces the pressure of a shaft liquid column, increases the production pressure difference, and gradually recovers the gas flow to carry out water discharge;
the gas-liquid mixed transportation pumping booster pump is pressurized by gas-liquid mixed transportation, is slightly higher than the pipe transportation pressure, is combined with other wells, enters a separator and is separated, and then enters an outward transportation system.
The invention has the following beneficial effects:
the method for dividing the production stage of the shale gas well adopts a gas-liquid pumping and mixing pump, so that the inlet of the production stage is not selected to be eaten, any complex liquid can be fed, and the tolerance capability to sand is strong; and can adapt to any gas-liquid ratio.
The shale gas well production stage dividing method disclosed by the invention adopts a gas-liquid pumping and mixing pump, the discharge capacity range is wide, the discharge capacity can be processed by 1000-10 ten thousand square/day under 400B @1MPa, and the efficiency is high; the energy consumption is low, and the temperature rise is small; meanwhile, the noise is low, and the lowest noise of a single pump is 65-70 db.
The method for dividing the production stage of the shale gas well adopts the gas-liquid pumping and mixing pump, has small mechanical vibration, does not need to be fixed, and is simple to install and maintain; meanwhile, automatic control and unattended operation are realized.
According to the method for dividing the production stage of the shale gas well, the gas-liquid mixed transportation suction booster pump and the negative pressure suction pump are utilized, the continuous production of the shale gas well can be ensured, the gas production rate and the yield increase amplitude are greatly increased, the EUR (ultimate recoverable reserve) of the shale gas well is far larger than that of the original theoretical production stage, and the recovery ratio is improved.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of partitioning the production stages of a shale gas well in accordance with the present invention;
FIG. 2 is a schematic diagram of a shale gas well full life cycle production model of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Please refer to fig. 1: the invention relates to a method for dividing production stages of shale gas wells, which comprises the following steps:
step 1: acquiring production data of a gas well, and acquiring relevant data of the gas well according to the production data of the gas well;
step 2: judging the production mode of the gas well according to the related data of the gas well, and dividing the production stage of the gas well at the same time;
and 3, step 3: the production stage of the step 2 comprises a drainage and mining stage, a sand production stage, a self-spraying production stage and a pumping pressurization stage; and in the pumping pressurization stage, a gas-liquid mixed transportation pumping booster pump and a negative pressure pumping pump are adopted, the gas-liquid mixed transportation pumping booster pump reduces the pressure of a shaft liquid column, the production pressure difference is increased, the gas amount is gradually recovered to carry out water discharge, and the gas-liquid mixed transportation pumping booster pump is pressurized through gas-liquid mixed transportation, is slightly higher than the pipe transportation pressure, is combined with other wells, enters a separator and is separated and then enters an external transportation system.
And 4, step 4: the production in the pumping and pressurizing stage is kept continuous and stable, the descending speed is low, the gas is mainly produced, the gas is changed into a continuous phase, the water yield is stably reduced, and the whole body is at a lower level;
and 5: based on the steps, the gas-liquid ratio tends to be stable along with the change of the gas production rate, and the final collected and stored quantity is judged;
step 6: and completing the production stage division of the shale gas well.
As shown in fig. 2: according to the scheme, the production management research of the shale gas well shows that the production stage division and dynamic characteristic description content of the gas well are determined, and the production dynamics of the shale gas well in different production stages can be better analyzed, and a measure scheme can be made in a targeted mode. Meanwhile, the production stage is divided into four major stages: a drainage and mining stage, a sand production stage, a self-spraying production stage and a pumping pressurization stage;
the method directly changes the intermittent stage into a continuous production stage (namely a suction pressurization stage), and the suction pressurization stage and the negative pressure suction and discharge and suction pressurization or artificial lifting stage are continuous production stages. The pumping and pressurizing production stage is the main production stage of the shale gas well, the production in the stage is kept continuous and stable, the descending speed is low, gas is mainly produced, the gas is changed into a continuous phase, the water yield is stably reduced, the whole body is at a lower level and is changed along with the change of the gas yield, the gas-liquid ratio tends to be stable, and the final recoverable reserve of the gas well is determined by the stage.
In the scheme, the gas-liquid pumping and mixing delivery pump can reduce the pressure of a shaft liquid column, increase the production pressure difference and gradually recover the gas flow to carry out water discharge; the gas-liquid mixed transportation pressurization is slightly higher than the pipe transportation pressure, and the gas-liquid mixed transportation pressurization is combined with other wells, enters a separator, is separated and then enters an external transportation system, so that on one hand, the oil pressure of a well head and the flowing pressure of a well bottom are reduced through well head ground suction, a low-pressure area is formed in a shaft stratum, and the yield of a single well and the liquid carrying capacity of the single well are improved; on the other hand, the influence of the pressure of the pipe network on the well is reduced through pressurization.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. The method for dividing the production stage of the shale gas well is characterized by comprising the following steps of:
step 1: acquiring production data of a gas well, and acquiring relevant data of the gas well according to the production data of the gas well;
step 2: judging the production mode of the gas well according to the related data of the gas well, and dividing the production stage of the gas well at the same time;
and step 3: the production stage of the step 2 comprises a drainage and mining stage, a sand production stage, a self-spraying production stage and a pumping pressurization stage;
and 4, step 4: the production in the pumping and pressurizing stage is kept continuous and stable, the descending speed is low, the gas is mainly produced, the gas is changed into a continuous phase, the water yield is stably reduced, and the whole body is at a lower level;
and 5: based on the steps, the gas-liquid ratio tends to be stable along with the change of the gas production rate, and the final collected and stored quantity is judged;
and 6: and completing the production stage division of the shale gas well.
2. The method for dividing the production stage of the shale gas well as recited in claim 1, wherein the pumping and pressurizing stage in the step 3 adopts a gas-liquid mixed transportation pumping booster pump and a negative pressure pumping pump.
3. The method for dividing the production stage of the shale gas well as recited in claim 2 wherein the gas-liquid mixture pumping booster pump reduces the pressure of the liquid column in the wellbore, increases the production pressure difference, and gradually recovers the gas flow to carry the effluent.
4. The method for dividing the production stages of the shale gas wells as claimed in claim 3, wherein the gas-liquid mixture transportation suction booster pump is boosted by gas-liquid mixture transportation, is slightly higher than the pipeline transportation pressure, and is combined with other wells to enter a separator to be separated and then enter an outward transportation system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115879644A (en) * | 2023-01-18 | 2023-03-31 | 西南石油大学 | Shale gas well production mode optimization method based on optimized tubular column |
Citations (5)
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| CN106014349A (en) * | 2016-07-29 | 2016-10-12 | 南充西南石油大学设计研究院有限责任公司 | Negative pressure suction water drainage and gas production device |
| CN109681184A (en) * | 2018-12-05 | 2019-04-26 | 中石化重庆涪陵页岩气勘探开发有限公司 | Shale gas well Production development prediction technique and equipment |
| CN111271026A (en) * | 2020-04-11 | 2020-06-12 | 重庆远方普兰德能源技术有限公司 | Multiphase compression system and method for achieving gas well drainage yield increase |
| US20210238973A1 (en) * | 2020-11-26 | 2021-08-05 | University Of Science And Technology Beijing | Method and device for developing shale gas by tapered gradient pressure drop with multi-stage fractured horizontal well |
| CN113638717A (en) * | 2021-09-14 | 2021-11-12 | 四川恒重清洁能源成套装备制造有限公司 | Low-pressure low-yield well drainage gas recovery method |
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- 2022-03-14 CN CN202210247671.2A patent/CN114622873A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014349A (en) * | 2016-07-29 | 2016-10-12 | 南充西南石油大学设计研究院有限责任公司 | Negative pressure suction water drainage and gas production device |
| CN109681184A (en) * | 2018-12-05 | 2019-04-26 | 中石化重庆涪陵页岩气勘探开发有限公司 | Shale gas well Production development prediction technique and equipment |
| CN111271026A (en) * | 2020-04-11 | 2020-06-12 | 重庆远方普兰德能源技术有限公司 | Multiphase compression system and method for achieving gas well drainage yield increase |
| US20210238973A1 (en) * | 2020-11-26 | 2021-08-05 | University Of Science And Technology Beijing | Method and device for developing shale gas by tapered gradient pressure drop with multi-stage fractured horizontal well |
| CN113638717A (en) * | 2021-09-14 | 2021-11-12 | 四川恒重清洁能源成套装备制造有限公司 | Low-pressure low-yield well drainage gas recovery method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115879644A (en) * | 2023-01-18 | 2023-03-31 | 西南石油大学 | Shale gas well production mode optimization method based on optimized tubular column |
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