CN105804742A - Shale gas reservoir three-dimensional fracturing method - Google Patents
Shale gas reservoir three-dimensional fracturing method Download PDFInfo
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- CN105804742A CN105804742A CN201610152181.9A CN201610152181A CN105804742A CN 105804742 A CN105804742 A CN 105804742A CN 201610152181 A CN201610152181 A CN 201610152181A CN 105804742 A CN105804742 A CN 105804742A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000010276 construction Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 abstract description 9
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Revetment (AREA)
Abstract
The invention discloses a shale gas reservoir three-dimensional fracturing method, which comprises the following steps that in a shale gas developing block, two horizontal wells with adjacent horizontal sections are selected; the fracturing is alternately performed on the first horizontal well and the second horizontal well; the fracturing positions are mutually staggered, so that the fracturing reformation volume of a shale gas reservoir is increased, and a complicated crack network in a large range can be formed; and meanwhile, the sand blocking risk of an oil gas well is reduced.
Description
Technical field
The present invention relates to natural petroleum gas field field, relate in particular to a kind of three-dimensional fracturing process of shale gas reservoir.
Background technology
Shale gas is a kind of based on free gas and adsorbed gas, be stored in low hole, hypotonic, rich in the unconventional gas resource in organic shale gas reservoir.Realize the commercial mining of shale gas, require that a large amount of adsorbed gas is free gas from substrate and mineral particle surface desorbing on the one hand；Reservoir must be made to have enough penetrating powers on the other hand, in order to the gas solving sucking-off can flow into pit shaft.It is not only form the plane crack with sufficient length and flow conductivity in reservoir that these two aspects factor makes theory during shale gas reservoir reconstruction entirely different with traditional view, but reservoir is carried out " three-dimensional transformation " in three directions of length, by reservoir " smashing ", form complex fracture network, increase the contact area of crack wall and reservoir matrix, shorten oil gas from any direction substrate to the flowing distance in crack, it is greatly enhanced reservoir overall permeability, thus realizing the industrialization exploitation of shale gas.
Existing shale gas reservoir fracturing method is broadly divided into synchronization pressure break and replaces pressure break two kinds.Synchronize pressure break and refer to that the pairing well to 2 mouthfuls or more than 2 mouthfuls carries out pressure break simultaneously, degree and the intensity that working area fracture network is formed to utilize interwell communication advantage to increase.But two cracks simultaneously extended in two wells when synchronizing pressure break, stress interference can only be produced at crack tip near zone, its interference effect scope is relatively limited, storey increase design small volume；Two crack distance between two tips must be made enough near additionally, synchronize FRACTURING DESIGN, stress disturbance could be produced in its vicinity, cause that between well, channelling risk increases.Secondly, alternately pressure break is in horizontal well multistage fracturing process, main for pressure break seam is stitched with branch the pressure break mode that the seam that relaxes with induced stress is connected, but which enters special underground operation tool under needing, and be easy to make near wellbore stress reverse, cause the formation of longitudinal crack, cause that the probability of Oil/gas Well sand plug increases.
Summary of the invention
For the problems referred to above of the prior art, the present invention proposes a kind of three-dimensional pressure break side of shale gas reservoir, method, in order to increases the fracturing reform volume of shale gas reservoir, form larger range of complex fracture network, reduces the risk of Oil/gas Well sand plug simultaneously.
The present invention is achieved through the following technical solutions:
A kind of three-dimensional fracturing process of shale gas reservoir, in a certain shale gas development block, choose two mouthfuls of water horizontal wells that horizontal segment is adjacent, with entering fracturing tool at present, implement the steps of: (a) carries out first time pressure break at first horizontal well toe-end, after pressure break terminates until first time, fracturing tool is moved to precalculated position to horizontal well butt, carry out second time pressure break；B (), after second time pressure break terminates, on second mouthful of water horizontal well pit shaft, between two pressure break bands that first horizontal well has been formed, carries out third time pressure break；C the fracturing tool of first horizontal well, after third time pressure break terminates, is moved to precalculated position to horizontal well butt, carries out the 4th pressure break by () again；D the fracturing tool of second mouthful of water horizontal well, after the 4th pressure break terminates, is moved between the pressure break band of second time and the 4th pressure break formation to horizontal well butt, carries out the 5th pressure break by () again；E (), according to the mode of step (c) ~ (d), hocket pressure break between first horizontal well and second mouthful of water horizontal well, until completing the horizontal segment pressing crack construction of two mouthfuls of wells.A kind of three-dimensional fracturing process of shale gas reservoir proposed by the invention, two mouthfuls of adjacent horizontal wells of horizontal segment are chosen in same shale gas development layer position, the horizontal segment relative distance of two mouthfuls of namely selected water horizontal wells is relatively near and horizontal-extending towards same or like orientation.In Liang Koujing, enter fracturing tool all down, carry out first time pressure break at first horizontal well toe-end, after pressure break terminates until first time, fracturing tool is moved to precalculated position to horizontal well butt, carry out second time pressure break；Afterwards on second mouthful of water horizontal well pit shaft, between two pressure break bands that first horizontal well has been formed, carry out third time pressure break；Hocket pressure break afterwards successively between first horizontal well, second mouthful of water horizontal well.Pressure break position on first horizontal well is moved to horizontal well butt gradually；Pressure break position on second mouthful of water horizontal well, then be always positioned at the somewhere between the pressure break band that last twice pressure break of first horizontal well is formed.Compared to existing synchronization pressure break and alternately fracturing process, the three-dimensional fracturing process of shale gas reservoir proposed by the invention has the advantage that the stress interference that (1) existing synchronization pressure break produces is limited only to crack tip near zone, and the method in the present invention is owing to the crack produced in second mouthful of well is between two cracks that first well produces, there is bigger stress interference effect, and then easily forming larger range of complex fracture network, reservoir reconstruction volume is bigger；(2) existing alternately fracturing process, its major fracture width and length are big by the impact of stress interference, there is the shortcoming such as sand plug risk height and flow conductivity instability, and adopt fracturing process of the present invention, the major fracture width of its generation is little by stress interference effect, flow conductivity is high, and sand plug probability is little；(3) fracturing process of the present invention, intersect overlapping portions and pit shaft have certain distance owing to two wells extend cracks, reduce the probability of near wellbore stress reversion, it is to avoid forms longitudinal crack near wellbore, adds the complexity of far field fracture network；(4) fracturing process of the present invention easy and simple to handle, without under enter special downhole tool, alleviate operator's homework burden, save the pressing crack construction time.
Further, the fracturing fluid that described fracturing process uses is riverfrac treatment liquid.Riverfrac treatment liquid refers to the fracturing fluid adding the additives such as a small amount of surfactant, drag reducer, clay stabilizer and scale preventative in clear water.Use riverfrac treatment liquid to carry out the technology of pressure break in engineering, be also referred to as riverfrac treatment technology or drag reduction water fracturing technique: first pump into " rock acid " and clear up the near wellbore zone being likely to be blocked up by drilling well fluid-tight；Then carry out riverfrac treatment, the substantial amounts of clear water with a small amount of coarse sand proppant is injected in crack, makes fracture extension；Finally wash away, proppant is removed from well.Riverfrac treatment utilizes the intrinsic fracture in reservoir, is injected by fracturing fluid and wherein makes stratum produce induced fractures, and in fracturing process, rock debris is shed in crack, plays the effect of proppant, make crack still keep opening after washing away together with the coarse sand injected.Riverfrac treatment cost is low, and injury is light, it is seldom necessary to clean, it is provided that proppant is migrated to pressure break grid by very long crack, is therefore especially adapted at the application in the low permeability gas reservoir of such as shale gas one class.
Preferably, described a certain shale gas development block is preferably the brittleness index shale gas reservoir more than 40.Higher for brittleness index, it is easy to broken shale gas reservoir, use the fracturing process in the present invention more can obtain the space seam web frame of solid, thus improving the ultimate recovery of shale gas reservoir greatly, it is thus achieved that better effect of increasing production.
The present invention compared with prior art, has such advantages as and beneficial effect:
1, the one three-dimensional fracturing process of shale gas reservoir of the present invention, by in a certain shale gas development block, choose two mouthfuls of water horizontal wells that horizontal segment is adjacent, hocket pressure break between first horizontal well and second mouthful of water horizontal well, and make its pressure break position also interlaced, and then easily form larger range of complex fracture network, with bigger reservoir reconstruction volume；
2, the one three-dimensional fracturing process of shale gas reservoir of the present invention, the major fracture width of its generation is little by stress interference effect, and flow conductivity is high, and sand plug probability is little；
3, the one three-dimensional fracturing process of shale gas reservoir of the present invention, certain distance is had with pit shaft owing to two wells extend the crossing overlapping portion in crack, reduce the probability of near wellbore stress reversion, it is to avoid form longitudinal crack near wellbore, add the complexity of far field fracture network；
4, the one three-dimensional fracturing process of shale gas reservoir of the present invention, easy and simple to handle, without under enter special downhole tool, alleviate operator's homework burden, save the pressing crack construction time.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by the embodiment of the present invention, constitutes the part of the application, is not intended that the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the pressure break sequential schematic of one specific embodiment of the present invention；
Wherein: 1-first time pressure break, 2-second time pressure break, 3-third time pressure break, the 4th pressure break of 4-, the 5th pressure break of 5-, the 6th pressure break of 6-, the 7th pressure break of 7-.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and exemplary embodiment and the explanation thereof of the present invention are only used for explaining the present invention, not as a limitation of the invention.
Embodiment 1:
A kind of three-dimensional fracturing process of shale gas reservoir as shown in Figure 1, in a certain shale gas development block, choose two mouthfuls of water horizontal wells that horizontal segment is adjacent, two mouthfuls of well horizontal segment extension orientation are identical, with a bite well location first well that horizontal segment extension is longer, with second mouthful of well of a bite well location that horizontal segment extension is shorter, with entering fracturing tool at present in Liang Koujing, implement the steps of: (a) carries out first time pressure break at first horizontal well toe-end, after until first time, pressure break terminates, fracturing tool is moved to precalculated position to horizontal well butt, carries out second time pressure break；B (), after second time pressure break terminates, on second mouthful of water horizontal well pit shaft, between two pressure break bands that first horizontal well has been formed, carries out third time pressure break；C the fracturing tool of first horizontal well, after third time pressure break terminates, is moved to precalculated position to horizontal well butt, carries out the 4th pressure break by () again；D the fracturing tool of second mouthful of water horizontal well, after the 4th pressure break terminates, is moved between the pressure break band of second time and the 4th pressure break formation to horizontal well butt, carries out the 5th pressure break by () again；E (), according to the mode of step (c) ~ (d), hocket pressure break between first horizontal well and second mouthful of water horizontal well, until completing the horizontal segment pressing crack construction totally seven times of two mouthfuls of wells.Wherein, each pressure break all adopts riverfrac treatment technology.In the present embodiment, the shale gas reservoir fracturing method adopted, there is bigger stress interference effect, and then easily form larger range of complex fracture network, reservoir reconstruction volume is bigger；The major fracture width of its generation is little by stress interference effect, and flow conductivity is high, and sand plug probability is little；Reduce the probability of near wellbore stress reversion, it is to avoid form longitudinal crack near wellbore, add the complexity of far field fracture network；Easy and simple to handle, without under enter special downhole tool, alleviate operator's homework burden, save the pressing crack construction time.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (3)
1. the three-dimensional fracturing process of shale gas reservoir, it is characterised in that in a certain shale gas development block, chooses two mouthfuls of water horizontal wells that horizontal segment is adjacent, with entering fracturing tool at present, implements the steps of:
A () carries out first time pressure break at first horizontal well toe-end, after pressure break terminates until first time, moved to precalculated position to horizontal well butt by fracturing tool, carry out second time pressure break；
B (), after second time pressure break terminates, on second mouthful of water horizontal well pit shaft, between two pressure break bands that first horizontal well has been formed, carries out third time pressure break；
C the fracturing tool of first horizontal well, after third time pressure break terminates, is moved to precalculated position to horizontal well butt, carries out the 4th pressure break by () again；
D the fracturing tool of second mouthful of water horizontal well, after the 4th pressure break terminates, is moved between the pressure break band of second time and the 4th pressure break formation to horizontal well butt, carries out the 5th pressure break by () again；
E (), according to the mode of step (c) ~ (d), hocket pressure break between first horizontal well and second mouthful of water horizontal well, until completing the horizontal segment pressing crack construction of two mouthfuls of wells.
2. a kind of three-dimensional fracturing process of shale gas reservoir according to claim 1, it is characterised in that: the fracturing fluid that described fracturing process uses is riverfrac treatment liquid.
3. a kind of three-dimensional fracturing process of shale gas reservoir according to claim 1, it is characterised in that: described a certain shale gas development block is preferably the brittleness index shale gas reservoir more than 40.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610152181.9A CN105804742A (en) | 2016-03-17 | 2016-03-17 | Shale gas reservoir three-dimensional fracturing method |
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| CN201610152181.9A CN105804742A (en) | 2016-03-17 | 2016-03-17 | Shale gas reservoir three-dimensional fracturing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644818A (en) * | 2016-12-29 | 2017-05-10 | 重庆科技学院 | Shale gas well yield simulation tester under quick water effect |
| CN106761606A (en) * | 2017-02-14 | 2017-05-31 | 中国石油大学(北京) | The asynchronous note CO of different well of symmetrical expression cloth seam2Oil production method |
| CN109740210A (en) * | 2018-12-21 | 2019-05-10 | 中国石油大学(北京) | Sand plug accident real-time risk assessment method and device under a kind of shale gas fractured well |
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2016
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644818A (en) * | 2016-12-29 | 2017-05-10 | 重庆科技学院 | Shale gas well yield simulation tester under quick water effect |
| CN106761606A (en) * | 2017-02-14 | 2017-05-31 | 中国石油大学(北京) | The asynchronous note CO of different well of symmetrical expression cloth seam2Oil production method |
| CN106761606B (en) * | 2017-02-14 | 2019-03-15 | 中国石油大学(北京) | The asynchronous note CO of different well of symmetrical cloth seam2Oil production method |
| CN109740210A (en) * | 2018-12-21 | 2019-05-10 | 中国石油大学(北京) | Sand plug accident real-time risk assessment method and device under a kind of shale gas fractured well |
| CN109740210B (en) * | 2018-12-21 | 2020-10-13 | 中国石油大学(北京) | Shale gas fracturing underground sand blocking accident real-time risk assessment method and device |
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