CN109751031A - It is environmental-friendly after a kind of shale gas well hydraulic fracturing to continue remodeling method - Google Patents
It is environmental-friendly after a kind of shale gas well hydraulic fracturing to continue remodeling method Download PDFInfo
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- CN109751031A CN109751031A CN201910035283.6A CN201910035283A CN109751031A CN 109751031 A CN109751031 A CN 109751031A CN 201910035283 A CN201910035283 A CN 201910035283A CN 109751031 A CN109751031 A CN 109751031A
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Abstract
Continue remodeling method the present invention relates to environmental-friendly after a kind of shale gas well hydraulic fracturing.Shale gas output undergoes desorption-diffusion-flow event, and hydraulic fracturing forms complicated seam net and only improves gas flow ability, and little to gas desorption-diffusivity effect, causes initial stage of production production decline after gas well pressure fast；Individual well fracturing fluid dosage is big simultaneously, and the row of returning leads and is generally lower than 30% after pressing, and is detained fracturing fluid and induces formation damage.Consider that organic matter in shale, pyrite are deposited in reducing environment, easy resolution characteristic under oxidizing condition, largely it is detained feature in conjunction with fracturing fluid, by the way that oxidant is added in fracturing fluid, it aoxidizes corrosion and induces the molten expansion effect of shale slit, realize the further transformation to shale matrix, improve gas desorption-diffusivity, enhance gas well fracturing effect, improves gas deposit recovery efficiency.The invention belongs to oil and gas exploration technology field, it is related to environmental-friendly after a kind of shale gas well hydraulic fracturing continuing remodeling method.
Description
Technical field
The invention belongs to oil and gas exploration technology fields, are related to a kind of side for enhancing shale gas well fracturing effect
Method is mainly used for consolidating shale gas well fracturing effect, improves shale gas yield.
Background technique
Hydraulic fracturing broken shale matrix, while intrinsic fracture is opened, so that forming complicated artificial fracture network inside gas-bearing formation
Network shortens the flowing distance, increase drainage area of the gas from matrix to crack, realizes shale gas reservoir economic development.Shale matrix
Seepage channel is based on nanoscale, and for matrix permeability mainly between darcy is received to microdarcy, gas flow resistance is huge, and inhales
Attached/free gas is simultaneously deposited, and gas transport ability is low.Hydraulic fracturing but is lacked for the purpose of generating as more as possible and complicated cracks
The weary further transformation ability to the micro-nano slit of shale matrix.Meanwhile ten thousand stere in hydraulic fracturing process individual well fluid volume,
Well shut-in period fracturing fluid enters shale matrix by spontaneous imbibition, and is bound in micro-nano pore surface and is difficult to the effectively row of returning,
Fracturing fluid hold-up accounts for 70% or more of working fluid total amount.A large amount of fracturing fluids are detained reservoir, and it is a series of to generate Water trapping etc.
Formation damage weakens shale gas well fracturing transformation effect.
Shale gas output need to undergo desorption-diffusion-flow event, and current hydraulic fracturing technology is directed generally to be promoted
The percolation ability of shale gas reservoir, and to deficiency the considerations of improving desorption-diffusion rate of the shale gas in micro-nano slit, suddenly
Depending on gas desorption-diffusivity, low initiation causes initial stage of production gas well yield after shale gas well pressure exponentially to be passed for unsaturated vapor
Subtract.Therefore, the desorption-diffusivity for improving micro-nano slit is to increase the gas well daily output after hydraulic fracturing transformation, delays yield
The important method of rate of decay.
Shale belongs to fine-grained sediment clastic rock, is quiet water body deposition and reducing environment product.Thus, organic matter and Huang Tie
Mine is more enriched with, and during geology diagenesis and hydrocarbon, there are the cementations of carbonate mineral, therefore contains a certain amount of carbon
Hydrochlorate mineral, such as calcite and dolomite.Rock rupture occurs under slacking for shale of appearing, while with soluble sulfuric acid
The formation of salt shows that pyrite is easily oxidized.In soil investigation, oxidant is widely used for removal soil with organic matter, and
Removal effect is significant；Meanwhile shale carbonate mineral group belongs to acid-soluble mineral, meets hydrochloric acid and is easily dissoluted.On the other hand,
Developing in shale matrix most commonly used is clay mineral intergranular pore and organic matter nano-pore, based on nanoscale hole.Shale
Full water law porosity and He gas survey porosity value are very close, show that water can invade shale overwhelming majority nanoscale hole.For
Oxidant enters shale matrix slit, carries out oxidation transformation effect and provides genetic prerequisite.
Strong reducing environment product is belonged to based on organic matter, the pyrite in shale, is easily oxidized under oxidative conditions point
The engineering characteristics that the geologic feature and fracturing fluid of solution are largely detained utilize shale self-priming by the way that oxidation solution is added in fracturing fluid
Behavior, diffusion profile oxidation solution promote organic matter and oxidation of pyrite to decompose, and the acid generated with oxidation process is to carbonate mine
The corrosion of object induces the molten expansion effect of shale slit, improves gas desorption-diffusivity of micro-nano slit, realizes to waterpower pressure
Split the useful supplement of effect.
Summary of the invention
The purpose of the present invention is to provide a kind of method for enhancing shale gas well fracturing effect, this method passes through existing
Have and oxidation solution is added in fracturing fluid, oxygenolysis shale organic matter and pyrite form dissolution porosity, improve shale matrix gas
Flow channel promotes the gas transport ability of micro-nano hole.This method gives full play to mechanics-chemistry between working solution and shale
Effect forms useful supplement to existing fracturing process, to reach enhancing shale gas well fracturing effect, improves fracturing reform
The purpose of shale gas well yield afterwards.
To achieve the above objectives, the present invention provides following technical scheme.
High-quality shale gas-bearing formation is rich in organic matter, pyrite and carbonate mineral.Wherein, the content of organic matter is generally higher than
2%, pyrite content is between 1%~5%, and mainly between 5%~20%, the volume of these three types of components accounts for carbonate mineral content
The ratio of shale total volume can reach 10% or more, and mainly be in random distribution state in shale.Therefore, it is based on destination layer position
Experimental effect analysis evaluation result is aoxidized in shale samples room utilizes corrosion or oxidation by the way that oxidation solution is added in fracturing fluid
Above-mentioned three classes component is decomposed, dissolution porosity is formed, expands shale matrix gas flow channel, and improve shale gas desorption-expansion
The ability of dissipating, delays the production declines period.
A method of enhancing shale gas well fracturing effect, it is characterised in that include the following steps:
(1) the shale gas well of selection hydraulic fracturing to be segmented flatly, according to the shale gas borehole logging tool, core analysis chemical examination and
Corresponding shale oxidation effectiveness Lab-evaluation data, judge the content of organic matter (TOC), carbonate mineral content, choose TOC >
2%, the shale gas well where the shale samples of carbonate mineral content > 5% carries out oxidation experiment evaluation, determines and is suitble to oxidation
The gas-bearing formation section of transformation；
(2) number of rows evidence is returned after collecting other well pressing crack construction data of this area and pressure, counts fracturing fluid recovery (backflow) rate；
(3) for the shale gas well in step (1), in conjunction with other well pressing crack construction data of this area, after offset well pressure
Fracturing fluid hold-up V in fracturing fluid recovery (backflow) rate inverse stratum1, in the V of each section of pressure break initial stage injection2Add in the fracturing fluid of volume
Enter oxidant (wherein V2=V1/ n, n are the number of segment of the well hydraulic fracturing), so that oxidant is made to be detained stratum generation effect completely,
Oxidant is initial mass concentration between 1%~12% hydrogenperoxide steam generator in fracturing fluid, is based on indoor oxidation anatonosis effect
Evaluation experimental determines the implantation concentration of oxidant；
(4) waterpower staged fracturing is carried out to selected shale gas well；
(5) well is boiled in a covered pot over a slow fire after pressing, and passes through the evaluation to the quantitatively characterizing of shale oxidation rate, oxidation anatonosis effect under indoor conditions
Analysis determines the stewing well time with reference to the design method for boiling in a covered pot over a slow fire the well time after conventional pressure；
(6) it drives a well and returns discharge fracturing fluid, goes into operation.
During boiling in a covered pot over a slow fire well, the row's of returning operation after shale gas well pressure, oxidizable component in the oxidation solution and shale that are detained reservoir is utilized
(such as organic matter, pyrite) interaction, oxidation corrosion persistently improves shale gas output channel, with existing fracturing technology
Beneficial complement is formed, shale gas desorption-diffusivity is further increased, to delay the production decline of shale gas well gas fast
Rate.
Compared with prior art, the present invention utilizes shale and hydrogenperoxide steam generator by the way that oxidation solution is added in fracturing fluid
Between chemical action induce the molten expansion of slit, improve shale gas desorption-diffusivity, have the advantages that
(1) largely it is detained feature using fracturing fluid, using containing the fracturing fluid for crossing hydrogenperoxide steam generator, gives full play to delay pressure
Liquid positive effect is split, using organic matter, the oxidizable characteristic of pyrite in shale component, corrosion is aoxidized and induces the molten expansion of shale slit,
The purpose being transformed for a long time after the realization shale reservoir pressure turned bane into boon；
(2) useful supplement is formed with existing fracturing technology, shale reservoir micro/nano-scale base is further transformed in oxidation corrosion
Matter slit promotes shale gas desorption-multiple dimensioned mass transfer ability of diffusion-seepage flow, strengthens gas supply of the matrix pores to fracture network
Ability delays gas yield rate of regression after pressure, improves gas deposit recovery efficiency；
(3) oxidation corrosion improves water phase self-priming path, further promotes shale self-priming, and hydrogenperoxide steam generator point has also been enlarged
Cloth range, the two recycle mutual promoting action without the reconstruction scope after raising shale gas well pressure, also exacerbate liquid phase residual, even
There is the not row of returning, avoids returning drain and deal with bring environmental pollution improperly, while drain processing cost is returned in reduction；
(4) operating procedure is simple, and economic cost is low.
Detailed description of the invention
Fig. 1 be embodiment shale rock sample distinguish self-priming distilled water, oxidation solution from pipette and time curve；
Fig. 2 is the shale rock sample of embodiment through distilled water (a and a '), and 10% hydrogenperoxide steam generator (b and b ') is before and after the processing
Generate the photo of macrocrack；
Fig. 3 is the Flied emission electromicroscopic photograph of the untreated sample of shale of embodiment；
Fig. 4 is that the shale rock sample of embodiment distills water process back court transmitting electromicroscopic photograph；
Fig. 5 is Flied emission electromicroscopic photograph after 10% hydrogenperoxide steam generator of shale rock sample of embodiment is handled；
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, in conjunction with attached drawing to this hair
Bright one embodiment is further described.
Reliability to verify of the invention has carried out 10% hydrogenperoxide steam generator of shale self-priming using distilled water as reference,
And shale-hydrogenperoxide steam generator interaction experiment, and shale hole knot before and after the processing is disclosed using Flied emission electron microscopic picture
The variation of structure.Specific steps are as follows:
(1) Longma small stream group richness organic shale is chosen, is drilled through in same sillar same position parallel bedding and chooses two pieces
Shale column sample (2.5 × 5cm)；Meanwhile it preparing two pieces of shale cubic block samples (0.5 × 0.5 × 0.5cm) and a surface is subjected to argon
Surface texture is observed using Flied emission Electronic Speculum after ion polishing；
(2) two pieces of column samples are distinguished into end face contact distillation water, 10% hydrogenperoxide steam generator, self-priming time 12h records self-priming
Front and back column sample end face metamorphosis；By two pieces of cubic block samples difference complete immersion distilled water, 10% hydrogenperoxide steam generator, (solid-to-liquid ratio is
1g:20ml), soaking time 48h；
(3) it by after shale block sample in an oven 60 DEG C of freeze-day with constant temperature 48h, is observed using Flied emission Electronic Speculum after polishing surface treatment
Surface texture；
Experimental result is shown: rich organic shale column sample self-priming distilled water, hydrogenperoxide steam generator 12h, hydrogen peroxide are final
From pipette it is more than 30% (Fig. 1) from pipette of distilled water, while observes the former column sample end face only 1 visible microcrack, and
The latter observes several microcracks (Fig. 2)；Observed based on Flied emission Electronic Speculum, distill rock sample after water process generate a little microcrack and
Part clay mineral structural damage (Fig. 4), a large amount of corrosion holes and microcrack such as Fig. 5 institute that rock sample generates after oxidation solution processing
Show.
To sum up, the present invention can make up the deficiency of existing fracturing technique, make full use of the mechanics-for being detained fracturing fluid and shale
Chemical action induces the molten expansion effect of slit, promotes shale matrix gas desorption-diffusivity, realizes long-term after shale gas well pressure
Transformation, the raising shale gas recovery ratio to turn bane into boon provide technical guarantee.
Claims (1)
1. environmental-friendly after a kind of shale gas well hydraulic fracturing continue remodeling method, it is characterised in that include the following steps:
(1) shale gas well of the selection a bite to waterpower staged fracturing is chemically examined and corresponding according to the shale gas borehole logging tool, core analysis
Shale oxidation effectiveness Lab-evaluation data, judge the content of organic matter (TOC), carbonate mineral content, choose TOC > 2%, carbon
Shale gas well where the shale samples of hydrochlorate mineral content > 5% carries out oxidation experiment evaluation, determines and is suitble to oxidation transformation
Gas-bearing formation section；
(2) number of rows evidence is returned after collecting other well pressing crack construction data of this area and pressure, counts fracturing fluid recovery (backflow) rate；
(3) for the shale gas well in step (1), fracturing fluid hold-up in fracturing fluid recovery (backflow) rate inverse stratum after offset well pressure is utilized
V1, in the V of each section of pressure break initial stage injection2Oxidant (wherein V is added in the fracturing fluid of volume2=V1/ n, n are that the well water forces
The number of segment split), so that oxidant be made to be detained stratum generation effect completely, in fracturing fluid oxidant be initial mass concentration between
1%~12% hydrogenperoxide steam generator tests the implantation concentration for determining oxidant based on indoor oxidation anatonosis effect assessment；
(4) waterpower staged fracturing is carried out to selected shale gas well；
(5) well is boiled in a covered pot over a slow fire after pressing, and passes through the evaluation point to the quantitatively characterizing of shale oxidation rate, oxidation anatonosis effect under indoor conditions
Analysis determines the stewing well time with reference to the design method for boiling in a covered pot over a slow fire the well time after conventional pressure；
(6) it drives a well and returns discharge fracturing fluid, goes into operation.
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Cited By (10)
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|---|---|---|---|---|
| CN110107271A (en) * | 2019-05-25 | 2019-08-09 | 西南石油大学 | A kind of supercritical water treatment method for strengthening shale matrix gas transport capability |
| CN110132678A (en) * | 2019-06-03 | 2019-08-16 | 西南石油大学 | Oxygen-sensitive oil and gas reservoir rock core flowing experiment sample pretreating method |
| CN111044712A (en) * | 2019-12-31 | 2020-04-21 | 西南石油大学 | Comprehensive evaluation method for shale water phase trapping damage |
| CN112112641A (en) * | 2020-10-10 | 2020-12-22 | 西南石油大学 | Experimental test method for soaking time of horizontal well of shale reservoir |
| CN113803045A (en) * | 2020-06-17 | 2021-12-17 | 中国石油化工股份有限公司 | Method for improving shale gas recovery ratio and simulation experiment method thereof |
| CN113863912A (en) * | 2021-09-08 | 2021-12-31 | 西南石油大学 | Oxidation cracking method for creating complex fracture network of fracture gas reservoir |
| CN114198088A (en) * | 2021-12-16 | 2022-03-18 | 中国石油天然气股份有限公司 | Optimization method of decreasing method for predicting flowback volume of fracturing fluid after shale gas well pressure |
| CN114634806A (en) * | 2020-12-16 | 2022-06-17 | 中国石油化工股份有限公司 | FeCl3Application of hydraulic fracturing fluid in shale gas exploitation and method for improving shale gas recovery ratio |
| CN114989804A (en) * | 2022-06-28 | 2022-09-02 | 西南石油大学 | Method for determining using amount of oxidizing liquid based on fracturing modification effect of shale gas layer |
| WO2023035416A1 (en) * | 2021-09-08 | 2023-03-16 | 西南石油大学 | Shale gas layer oxidative burst transformation method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107271A (en) * | 2019-05-25 | 2019-08-09 | 西南石油大学 | A kind of supercritical water treatment method for strengthening shale matrix gas transport capability |
| CN110107271B (en) * | 2019-05-25 | 2021-08-03 | 西南石油大学 | Supercritical water treatment method for reinforcing gas transport capacity of shale matrix |
| CN110132678A (en) * | 2019-06-03 | 2019-08-16 | 西南石油大学 | Oxygen-sensitive oil and gas reservoir rock core flowing experiment sample pretreating method |
| CN111044712A (en) * | 2019-12-31 | 2020-04-21 | 西南石油大学 | Comprehensive evaluation method for shale water phase trapping damage |
| CN111044712B (en) * | 2019-12-31 | 2022-02-08 | 西南石油大学 | Comprehensive evaluation method for shale water phase trapping damage |
| CN113803045A (en) * | 2020-06-17 | 2021-12-17 | 中国石油化工股份有限公司 | Method for improving shale gas recovery ratio and simulation experiment method thereof |
| CN112112641B (en) * | 2020-10-10 | 2021-05-11 | 西南石油大学 | Experimental test method for soaking time of horizontal well of shale reservoir |
| CN112112641A (en) * | 2020-10-10 | 2020-12-22 | 西南石油大学 | Experimental test method for soaking time of horizontal well of shale reservoir |
| CN114634806A (en) * | 2020-12-16 | 2022-06-17 | 中国石油化工股份有限公司 | FeCl3Application of hydraulic fracturing fluid in shale gas exploitation and method for improving shale gas recovery ratio |
| CN113863912A (en) * | 2021-09-08 | 2021-12-31 | 西南石油大学 | Oxidation cracking method for creating complex fracture network of fracture gas reservoir |
| CN113863912B (en) * | 2021-09-08 | 2023-03-14 | 西南石油大学 | Oxidation cracking method for creating complex fracture network of fracture gas reservoir |
| WO2023035416A1 (en) * | 2021-09-08 | 2023-03-16 | 西南石油大学 | Shale gas layer oxidative burst transformation method |
| CN114198088A (en) * | 2021-12-16 | 2022-03-18 | 中国石油天然气股份有限公司 | Optimization method of decreasing method for predicting flowback volume of fracturing fluid after shale gas well pressure |
| CN114198088B (en) * | 2021-12-16 | 2024-03-29 | 中国石油天然气股份有限公司 | Optimal method for predicting decreasing method of fracturing fluid flowback volume after shale gas well fracturing |
| CN114989804A (en) * | 2022-06-28 | 2022-09-02 | 西南石油大学 | Method for determining using amount of oxidizing liquid based on fracturing modification effect of shale gas layer |
| CN114989804B (en) * | 2022-06-28 | 2023-09-19 | 西南石油大学 | Method for determining consumption of oxidizing liquid based on shale gas layer fracturing transformation effect |
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Application publication date: 20190514 |