CN106593394A - Shale gas fracturing stepping sand-adding method - Google Patents
Shale gas fracturing stepping sand-adding method Download PDFInfo
- Publication number
- CN106593394A CN106593394A CN201710058166.2A CN201710058166A CN106593394A CN 106593394 A CN106593394 A CN 106593394A CN 201710058166 A CN201710058166 A CN 201710058166A CN 106593394 A CN106593394 A CN 106593394A
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- sand
- slug
- pressure
- infusion
- adds
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 159
- 239000007788 liquid Substances 0.000 claims abstract description 49
- 239000012530 fluid Substances 0.000 claims abstract description 22
- 238000010276 construction Methods 0.000 claims abstract description 9
- 230000000630 rising effect Effects 0.000 claims abstract description 5
- 238000001802 infusion Methods 0.000 claims description 28
- 238000006073 displacement reaction Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 47
- -1 and than constant Chemical compound 0.000 claims 2
- 239000006004 Quartz sand Substances 0.000 claims 1
- 238000005086 pumping Methods 0.000 abstract 7
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
Classifications
-
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a shale gas fracturing stepping sand-adding method which comprises the following steps: (1) pumping a prepared fluid into a shaft and causing the fluid enter into ground gaps; (2) pumping a first sand-adding section plug and performing the stepping sand adding; (3) pumping a first fluid section plug, and if the pressure shows as diagonal rising, confirming that the pressure change is mild and the sand ratio has a rising potential, and then skipping to the step (4), and if the pressure shows as the sand ratio rising unsuitable for the present stage, further pumping the fracturing fluid for forming gaps and then skipping to the step (1); (4) pumping a second sand-adding section plug and performing the stepping sand adding; (5) pumping a second fluid section plug and observing the pressure variation trend of the sand-adding section plug at different sand ratios after entering into the stratum; and (6) repeating the steps (4)-(5) for 15-20 times till meeting the requirement for designed fracturing sand-adding volume, completing the sand adding in each stage, and lastly, pumping the displacing liquid and completing the whole fracturing construction task. According to the invention, the stepping sand-adding method is adopted for effectively preventing reservoir sand blocking, reducing the construction risk and guaranteeing the smooth construction.
Description
Technical field
The present invention relates to shale gas exploration and development fracturing engineering technical field, more particularly to a kind of shale gas pressure break ladder adds
Sand method.
Background technology
In shale gas reservoir fracturing improvement, add sand technique frequently with slug formula, that is, pump one plus sand slug, then pump
One liquid slug, and so on, sand ratio is stepped up, and is characterized in one plus the constant grit dosage of sand slug, it is impossible to
Anticipation adds sand critical point, easily causes sand plug, increases subsequent construction operation and engineering cost, affects reservoir reconstruction effect.
The content of the invention
In order to overcome the defect of above-mentioned prior art, it is an object of the invention to provide a kind of shale gas pressure break ladder adds sand
Method, using staged sand adding method, effectively prevents reservoir sand plug, reduces construction risk；Explore reservoir and add sand critical point, effectively
Realize building the pressure in seam, strengthen correctional effect；Crack effective support is at utmost completed, the high seepage channel of gas is set up；After guidance
Than design, continuous development well sand ensures that construction is smoothed out.
In order to achieve the above object, the technical scheme is that：
A kind of shale gas pressure break ladder sand adding method, comprises the following steps：
(1), infusion prepad fluid：Using ground high pressure pumping-in equipment, to the prepad fluid of pit shaft infusion 5-7 hole volume
Amount, liquid make seam into stratum.
(2), infusion first plus sand slug, prepad fluid enter after stratum makes seam, start proppant stone is added in fracturing fluid
To fill crack, using the sand liquid measure of 2-3 hole volume as one plus sand slug, first adds 60- before sand slug to sand
The sand liquid measure of 80% volume adds sand than A by sand, and than constant, sand is initially 1% than A to sand, 20-40% bodies after first plus sand slug
Long-pending sand liquid measure adds sand than B by sand, and than constant, sand has certain lifting than A compared with sand than B to sand, lifts 1-2%, so completes this section
Ladder adds sand；
(3), first liquid slug of infusion, using the pressure break liquid measure of 1-2 hole volume as a liquid slug, infusion
Into pit shaft, the sand slug that adds for replacing step (2) enters stratum, and by well head pressure data, that observes different sand ratios adds sand section
The pressure trend behind stratum is entered, if pressure shows as oblique line rising and shows that pressure change is gentle, sand ratio is improved sky
Between, into step (4)；If pressure shows as closely ramping, pressure rises more than 0.5 MPa/second, shows to carry at this stage
Sand ratio is risen, needs further infusion fracturing fluid to make seam, into step (1)；
(4), infusion second plus sand slug, using the sand liquid measure of 2-3 hole volume as one plus sand slug, this slug
The sand liquid measure of front 60-80% volumes adds sand than B by sand, and than constant, after this slug, the sand liquid measure of 20-40% volumes compares C by sand to sand
Plus sand, than constant, sand has certain lifting than B compared with sand than C to sand, lifts 1-2%, so completes this section of ladder and add sand；
(5), second liquid slug of infusion, using the pressure break liquid measure of 1-2 hole volume as a liquid slug, infusion
Into pit shaft, the sand slug that adds for replacing step (4) enters stratum, and by well head pressure data, that observes different sand ratios adds sand section
Enter the pressure trend behind stratum；
(6), repeat step (4) completes each to step (5) 15-20 time specifically to reach FRACTURING DESIGN sand feeding amount to require
Stage adds sand, last infusion displacement fluid to complete whole pressing crack construction task.
In any one liquid slug, plus after sand slug enters stratum, operation pressure is steady, is held essentially constant, shows
Stratum adds grittiness good, increases to 3 or more different sand ratios, progressively carry according to the increment of 1-2% in next plus sand slug
Rise, increase the sand amount and liquid sand-transport effeciency in fracturing reform.
Described preposition liquid measure and fracturing fluid are slippery water.
The present invention compares traditional slug and adds sand technique, and in same plus sand slug, staged increases one or two sand
Than, by observing well head pressure data variation, if pressure steadily if continue operation, if pressure rises obvious, show that reservoir adds sand
Difficulty, needs further to make seam, or has reached that reservoir is critical plus sand point.By ladder plus the process of sand, being capable of anticipation
Subsequently add sand space, lift liquid sand-transport effeciency, exploration stratum is critical to add sand point.Meanwhile, by controllable high sand ratio, it is capable of achieving
It is of short duration in crack to build the pressure, crack net pressure is improved, strengthens reservoir reconstruction effect.
Specific embodiment
The ladder that certain mouthful of shale gas well fracturing is presented herein below adds sand pump note program (general introduction), does furtherly as embodiment
It is bright.
Embodiment one
Table 1 adds sand pump note program (general introduction) to illustrate with the ladder of certain mouthful of shale gas well fracturing.
The present embodiment is comprised the following steps：
(1), infusion prepad fluid：Using ground high pressure pumping-in equipment, to before 120 side of pit shaft infusion (6 hole volumes)
Liquid measure is put, liquid makes seam into stratum.
(2), infusion first plus sand slug, prepad fluid enter after stratum makes seam, start proppant stone is added in fracturing fluid
Sand adds sand slug as one using the sand liquid measure of 40 sides (2 hole volumes), before first adds sand slug to fill crack
62.5% volume presses sand than 1% plus sand, and sand than constant, after first plus sand slug, press sand and add sand than 2% by 37.5% volume.
(3), first liquid slug of infusion, the pressure break liquid measure using 35 sides (1.7 hole volumes) is used as a liquid segment
Plug, infusion enter pit shaft, and the sand slug that adds for replacing step 2 enters stratum, and pressure slowly rises in oblique line, belongs to normal condition.
(4), infusion second plus sand slug, using the sand liquid measure of 40 sides (2 hole volumes) as second plus sand slug,
Before this slug, 62.5% volume presses sand than 2% plus sand, and sand than constant, after this slug, press sand and add sand, sand ratio than 4% by 37.5% volume
It is constant.
(5), second liquid slug of infusion, the pressure break liquid measure using 35 sides (1.7 hole volumes) is used as a liquid segment
Plug, infusion enter pit shaft, and the sand slug that adds for replacing step 2 enters stratum, and pressure slowly rises in oblique line, belongs to normal condition.
(6), repeat step (4) adds up plus sand slug 20, completes plus sand requirement, last pump to step (5) 18 times
Note displacement fluid, completes whole pressing crack construction task.The table 1 of above-described embodiment one represents that infusion program is as follows：
The well is the first prospect pit of the blank exploration area in Chongqing South East area, by the ladder SAND FRACTURING TECHNOLOGY, can
Effectively anticipation subsequently adds sand space, improves liquid sand-transport effeciency, and desk study stratum is critical plus sand point, is follow-up pressure break side
Case design is there is provided reliable basis.Meanwhile, by controllable high sand ratio, realize it is of short duration in crack build the pressure, improve crack fine pressure
Power, fracturing transformation effect are good.
Embodiment two
The present embodiment pressure break ladder sand adding method see the table below, and infusion program is as follows：
The well is Chongqing South East area shale gas horizontal well, by the ladder SAND FRACTURING TECHNOLOGY, being capable of effective anticipation well
Eye walks the follow-up plus sand space of Different Strata, improves liquid sand-transport effeciency, and the critical plus sand of desk study Different Strata
Point, provides reliable basis for the design of subsequent well well track, design of hydraulic fracturing scheme, meanwhile, in second plus sand slug, apply
Work pressure is steady, is held essentially constant, shows that stratum adds grittiness good, increases to 3 different sand ratios, according to 1% increment progressively
Lifted, increase fracturing reform in sand amount and liquid sand-transport effeciency, realize it is of short duration in crack build the pressure, improve crack net pressure,
Fracturing transformation effect is good.
Claims (3)
1. a kind of shale gas pressure break ladder sand adding method, it is characterised in that comprise the following steps：
(1), infusion prepad fluid：Using ground high pressure pumping-in equipment, to the preposition liquid measure of pit shaft infusion 5-7 hole volume, liquid
Body makes seam into stratum；
(2), infusion first plus sand slug, prepad fluid enter after stratum makes seam, start proppant quartz sand is added in fracturing fluid
To fill crack, using the sand liquid measure of 2-3 hole volume as one plus sand slug, first adds 60-80% bodies before sand slug
Long-pending sand liquid measure adds sand than A by sand, and than constant, sand is initially 1% than A to sand, the sand of 20-40% volumes after first plus sand slug
Liquid measure adds sand than B by sand, and than constant, sand has certain lifting than A compared with sand than B to sand, lifts 1-2%, so completes this section of ladder and add
Sand；
(3), first liquid slug of infusion, using the pressure break liquid measure of 1-2 hole volume as a liquid slug, infusion is entered
Pit shaft, the sand slug that adds for replacing step (2) enter stratum, and by well head pressure data, the sand slug that adds of the different sand ratios of observation enters
Enter the pressure trend behind stratum, if pressure shows as oblique line rising and shows that pressure change is gentle, sand ratio is improved space, enters
Enter step (4)；If pressure shows as closely ramping, pressure rises more than 0.5 MPa/second, shows to lift sand at this stage
Than needing further infusion fracturing fluid to make seam, into step (1)；
(4), infusion second plus sand slug, using the sand liquid measure of 2-3 hole volume as one plus sand slug, before this slug
The sand liquid measure of 60-80% volumes adds sand than B by sand, and than constant, after this slug, the sand liquid measure of 20-40% volumes is added than C sand by sand
Sand, than constant, sand has certain lifting than B compared with sand than C to sand, lifts 1-2%, so completes this section of ladder and add sand；
(5), second liquid slug of infusion, using the pressure break liquid measure of 1-2 hole volume as a liquid slug, infusion is entered
Pit shaft, the sand slug that adds for replacing step (4) enter stratum, and by well head pressure data, the sand slug that adds of the different sand ratios of observation enters
Enter the pressure trend behind stratum；
(6), repeat step (4) completes each stage to step (5) 15-20 time specifically to reach FRACTURING DESIGN sand feeding amount to require
Plus sand, last infusion displacement fluid, complete whole pressing crack construction task.
2. a kind of shale gas pressure break ladder sand adding method according to claim 1, it is characterised in that in any one liquid
After adding sand slug to enter stratum in slug, operation pressure is steady, is held essentially constant, shows that stratum adds grittiness good, in next plus sand
3 or more different sand ratios are increased in slug, are stepped up according to the increment of 1-2%, increase sand amount in fracturing reform and
Liquid sand-transport effeciency.
3. a kind of shale gas pressure break ladder sand adding method according to claim 1, it is characterised in that described preposition liquid measure
And fracturing fluid is slippery water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710058166.2A CN106593394B (en) | 2017-01-23 | 2017-01-23 | A kind of shale gas pressure break ladder sand adding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710058166.2A CN106593394B (en) | 2017-01-23 | 2017-01-23 | A kind of shale gas pressure break ladder sand adding method |
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| Publication Number | Publication Date |
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| CN106593394A true CN106593394A (en) | 2017-04-26 |
| CN106593394B CN106593394B (en) | 2019-03-05 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023285A (en) * | 2017-05-16 | 2017-08-08 | 华美孚泰油气增产技术服务有限责任公司 | A kind of shale gas reservoir hydraulic fracturing adds sand technique |
| CN108222910A (en) * | 2018-01-22 | 2018-06-29 | 成都西油联合石油天然气工程技术有限公司 | A kind of fixed displacement slug formula fracturing technology |
| CN109267988A (en) * | 2017-07-18 | 2019-01-25 | 中国石油化工股份有限公司 | A kind of shale gas pressure break middle section plug sand adding method |
| CN111946319A (en) * | 2020-08-20 | 2020-11-17 | 中国石油天然气股份有限公司 | Sand adding method for fracturing transformation |
| CN112031759A (en) * | 2020-09-17 | 2020-12-04 | 中国石油天然气股份有限公司 | Construction control method for fracturing site of vertical well multi-branch seam |
| CN112240191A (en) * | 2019-07-19 | 2021-01-19 | 中国石油化工股份有限公司 | Shale gas fracturing sand adding method |
| CN112282716A (en) * | 2020-10-26 | 2021-01-29 | 张悦 | Pulse sand adding fracturing method and pulse sand adding fracturing device for oil and gas exploitation |
| CN113107451A (en) * | 2020-01-13 | 2021-07-13 | 中国石油化工股份有限公司 | Method for maintaining long-term flow conductivity of hot dry rock fracturing fracture |
| CN114135266A (en) * | 2021-11-09 | 2022-03-04 | 中国石油天然气集团有限公司 | Efficient fracturing sand adding method based on water hammer effect |
| CN114592842A (en) * | 2020-12-04 | 2022-06-07 | 中国石油天然气股份有限公司 | Continental facies shale oil reservoir fracturing sand adding method |
| CN116044367A (en) * | 2023-03-31 | 2023-05-02 | 中国石油大学(华东) | Constant sand ratio sand fracturing method for improving in-seam supporting effect |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023285A (en) * | 2017-05-16 | 2017-08-08 | 华美孚泰油气增产技术服务有限责任公司 | A kind of shale gas reservoir hydraulic fracturing adds sand technique |
| CN109267988A (en) * | 2017-07-18 | 2019-01-25 | 中国石油化工股份有限公司 | A kind of shale gas pressure break middle section plug sand adding method |
| CN109267988B (en) * | 2017-07-18 | 2020-08-21 | 中国石油化工股份有限公司 | Middle plug type sand adding method for shale gas fracturing |
| CN108222910A (en) * | 2018-01-22 | 2018-06-29 | 成都西油联合石油天然气工程技术有限公司 | A kind of fixed displacement slug formula fracturing technology |
| CN112240191A (en) * | 2019-07-19 | 2021-01-19 | 中国石油化工股份有限公司 | Shale gas fracturing sand adding method |
| CN113107451A (en) * | 2020-01-13 | 2021-07-13 | 中国石油化工股份有限公司 | Method for maintaining long-term flow conductivity of hot dry rock fracturing fracture |
| CN113107451B (en) * | 2020-01-13 | 2023-02-28 | 中国石油化工股份有限公司 | Method for maintaining long-term flow conductivity of hot dry rock fracturing fracture |
| CN111946319A (en) * | 2020-08-20 | 2020-11-17 | 中国石油天然气股份有限公司 | Sand adding method for fracturing transformation |
| CN111946319B (en) * | 2020-08-20 | 2023-01-10 | 中国石油天然气股份有限公司 | Sand adding method for fracturing modification |
| CN112031759A (en) * | 2020-09-17 | 2020-12-04 | 中国石油天然气股份有限公司 | Construction control method for fracturing site of vertical well multi-branch seam |
| CN112031759B (en) * | 2020-09-17 | 2023-12-01 | 中国石油天然气股份有限公司 | On-site construction control method for fracturing multiple branch joints of vertical well |
| CN112282716A (en) * | 2020-10-26 | 2021-01-29 | 张悦 | Pulse sand adding fracturing method and pulse sand adding fracturing device for oil and gas exploitation |
| CN114592842A (en) * | 2020-12-04 | 2022-06-07 | 中国石油天然气股份有限公司 | Continental facies shale oil reservoir fracturing sand adding method |
| CN114135266A (en) * | 2021-11-09 | 2022-03-04 | 中国石油天然气集团有限公司 | Efficient fracturing sand adding method based on water hammer effect |
| CN116044367A (en) * | 2023-03-31 | 2023-05-02 | 中国石油大学(华东) | Constant sand ratio sand fracturing method for improving in-seam supporting effect |
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