CN108300442A - A kind of shale gas pressure break overcome high stress difference temporarily stall to diverting agent and preparation method thereof - Google Patents
A kind of shale gas pressure break overcome high stress difference temporarily stall to diverting agent and preparation method thereof Download PDFInfo
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- CN108300442A CN108300442A CN201711330414.0A CN201711330414A CN108300442A CN 108300442 A CN108300442 A CN 108300442A CN 201711330414 A CN201711330414 A CN 201711330414A CN 108300442 A CN108300442 A CN 108300442A
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- diverting agent
- shale gas
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- high stress
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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Abstract
Overcoming high stress difference the invention discloses a kind of shale gas pressure break, temporarily to diverting agent, which carries out reaction by raw material components natural plant gum, Sodium Polyacrylate, ammonium polyphosphate, sodium abietate and polyethylene glycol and is made stall.Preparation method includes the following steps：A certain amount of distilled water is added in the reaction vessel, then natural plant gum, Sodium Polyacrylate, ammonium polyphosphate, sodium abietate and polyethylene glycol is added, stirring, and reaction solution is warming up to 80 DEG C, continue constant temperature and stirs 2h, until all dissolvings, then it is cooled to 50 DEG C, discharging is dried in vacuo, and head product is obtained.The diverting agent of the present invention is combined using natural polymer, and degradation property is good, and for degradation rate up to 100%, temperature resistant capability is strong, and for maximum temperature up to 180 DEG C, compression strength is high, up to 80MPa, degradation solution fanout free region, pollution-free, safety and environmental protection.
Description
Technical field
The invention belongs to oilfield stimulation technical fields, and in particular to a kind of shale gas pressure break overcome high stress difference temporarily stall to
With diverting agent and preparation method thereof.
Background technology
Shale gas is a kind of unconventional gas resource, worldwide can technology mine reserves it is huge.In recent years, with
It production technology to make a breakthrough, the U.S. realizes shale gas commercialization exploitation, makes the extensive wide using having of shale gas
Foreground.
In shale gas fracturing process, in order to overcome high stress poor, changes the flow direction of original liquid and newly split with reaching to generate
The purpose of seam is developed for the temporary stall of shale gas well fracturing to high-strength temporary blocking agent, is carried out in fracturing fluid to diverting agent
Solubility property is tested, and is carried out rock core and temporarily blocked up and restore experiment test.The experimental results showed that the diverting agent is in different temperatures pressure break
Pendular ring is completely dissolved in border, noresidue solid, degradation rate 100%.In fracturing fluid when diverting agent dosage 3-10%, rock core temporarily blocks up rate
95-98% is can reach, recovery of core permeability can reach 97-99% after diverting agent degradation.Illustrate the diverting agent developed not
Only there is good temporarily stifled turning efficiency, and to formation damage very little after degradation.By crush test, compression strength reaches
80MPa or more.
Temporary plugging technique has applied to all kinds of construction operations of Oil Field at present, including drilling well, well cementation, well workover, well-flushing with
And well stimulation etc., each elephant start in pressing crack construction using multiple cracking technology in section or the increasing pair of crack steering technique
The transformation dynamics of low permeability reservoir, thus by reservoir maximum production.For the temporary stifled material of well fracturing mainly have at present by
The diverting agent of diverting agent and cross-linked, water-soluble Macroscopic single crystal that inorganic salts and water-soluble component are mixed to prepare.By inorganic salts and
Diverting agent made from water-soluble component not only possesses excellent water solubility, plugging strength higher, and solution rate is faster, both may be used
It can be used for the fracture acidizing construction of well again for oil well.Crosslinking polymer diverting agent is divided into granular pattern and rubber plug type, passes through
Crosslinked method obtains being dried after full-bodied fluid, shears, is granulated the particle for being formed and can be used for temporarily blocking up, and can also pass through friendship
The method of connection forms temporarily stifled rubber plug after forming high viscosity fluid injection stratum.But the either diverting agent system of solid or liquid,
It is dissolved in the water since its own cannot degrade, addition gel breaker is required for make its broken glue and then system is made smoothly to return discharge ground
Layer.In addition by the polymer based on polyacrylamide, as diverting agent, there has also been certain applications, and its plugging strength and
Temporarily stifled rate can also meet the requirement of site operation, but have higher viscosity after its degradation, make fracturing fluid viscosity rise and
The row of returning being unfavorable for after construction, can cause stratum larger injury.
Existing all kinds of diverting agents have certain temporary stifled performance but also have the defect of its own, the body being made of inorganic salts
Permanent blockage can be caused to stratum by tying up to inorganic salts release in course of dissolution, be unfavorable for later stage oil-gas mining；Cross-linking type polymerize
Object, which needs gel breaker is added after construction, could break glue, can increase construction week in needing temporarily longer construction operation of stifled time
Phase causes cost increase, while crosslinking polymer solubility property is poor, and partly cannot break glue completely in fracturing fluid equally can
It is trapped in stratum, is influencing later stage recovery process；Fracturing fluid viscosity can be made to increase after the dissolving of PAM class diverting agents, be unfavorable for pressure break
The row of returning of liquid.
Invention content
It is excellent it is an object of the invention to solve at least the above and/or defect, and provide at least to will be described later
Point.
A further object of the invention is to solve defect existing for existing diverting agent：The diverting agent of inorganic salts composition can be right
Permanent blockage is caused on stratum, is unfavorable for later stage oil-gas mining, and crosslinking polymer diverting agent needs addition gel breaker that could break glue,
Increase construction period, cause cost increase, while the technical problems such as crosslinking polymer solubility property is poor, a kind of shale is provided
Air pressure split overcome high stress difference temporarily stall to diverting agent.
It is a still further object of the present invention to provide a kind of shale gas pressure break overcome high stress difference temporarily stall to diverting agent
Preparation method, processing step is simple, is easy to industrialized production.
In order to realize these purposes and other advantages of the invention, the present invention provides a kind of shale gas pressure breaks to overcome high stress
Poor temporarily stall is to diverting agent, and the diverting agent is by raw material components natural plant gum, Sodium Polyacrylate, ammonium polyphosphate, sodium abietate and poly-
Ethylene glycol carries out reaction and is made.
Preferably, each raw material component presses following mass percentage composition：Natural plant gum 25-30%, Sodium Polyacrylate 10-
15%, ammonium polyphosphate 5-10%, sodium abietate 20-25%, polyethylene glycol 30-35%.
Preferably, the natural plant gum includes at least one of xanthans, sesbania gum, flax gum, fenugreek gum.
Preferably, the general molecular formula of the ammonium polyphosphate is (NH4)(n+2)PnO(3n+1), n be 10-20 integer in extremely
Few one kind.
Preferably, the polyethylene glycol is at least one of PEG4000, PEG8000, PEG10000, PEG20000.
The shale gas well that the diverting agent is suitable for 120 DEG C or more temporarily blocks up construction.
It is a kind of prepare above-mentioned shale gas pressure break overcome high stress difference temporarily stall to the preparation method with diverting agent comprising such as
Lower step：A certain amount of distilled water is added in the reaction vessel, natural plant gum, Sodium Polyacrylate, ammonium polyphosphate, rosin is then added
Sour sodium and polyethylene glycol, stirring, and reaction solution is warming up to 80 DEG C, continue constant temperature and stirs 2h, until all dissolvings, then be cooled to
50 DEG C, discharging is dried in vacuo, and head product is obtained.
Preferably, above-mentioned preparation method specifically comprises the following steps：A certain amount of distilled water is added in the reaction vessel,
Stirring is opened, sesbania gum, xanthans, Sodium Polyacrylate, (NH are then sequentially added4)16P14O43、(NH4)18P16O49, rosin acid
Sodium, PEG10000 and PEG20000, and reaction solution is warming up to 80 DEG C, continue constant temperature and stirs 2h, until all dissolvings, then cool down
To 50 DEG C, discharging is dried in vacuo, and obtains head product, head product is sieved to obtain 20-60 mesh diverting agents, can also be processed
At particle or sphere.
Preferably, the head product is heated by screw extruder and melts and squeeze out, and is cut and is granulated with comminutor, molding
It is grain size in the diverting agent particle of 5-8mm, or with injection molding is machined to the temporary plugging ball of 5-25mm.
The invention has the beneficial effects that：
One is combined using natural polymer, and degradation property is good, and degradation rate is up to 100%, temperature resistant capability
By force, for maximum temperature up to 180 DEG C, compression strength is high, up to 80MPa, degradation solution fanout free region, pollution-free, safety and environmental protection.
Secondly, the diverting agent for preparing is suitable for 120 DEG C or more of shale gas well and temporarily blocks up construction, be a kind of shale gas pressure break gram
The temporary stall of high stress difference is taken to the diverting agent with high intensity.
Thirdly, can by application amount agent size, at be grouped as, granular size control blocking time.
Description of the drawings
Fig. 1 casing programme figures.
Fig. 2 comprehensive logging curve graphs.
Fig. 3 .A, B are microseism detection figure.
Specific implementation mode
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Embodiment 1
200 grams of distilled water are added in 500 milliliters of reaction vessels, open stirring, then sequentially adds 28 grams of xanthans, gather
10 grams, 8 grams ammonium polyphosphate (NH of sodium acrylate4)12P10O31, 22 grams and 32 grams polyethylene glycol 10000 of sodium abietate, and will reaction
System is gradually heating to 80 DEG C, continues to stir 2h, until all dissolvings, are then cooled to 50 DEG C, discharging is dried in vacuo, and is obtained
It to head product, is sieved, obtains 20-60 mesh diverting agents.Or head product is heated by screw extruder and melts and squeezes out,
It is cut and is granulated with comminutor, be shaped to grain size in the particle of 5-8mm, the temporary plugging ball of 5-25mm can also be machined to injection molding.
The shale gas well that the diverting agent of this method synthesis is suitable for 120 DEG C or more temporarily blocks up construction.
Embodiment 2
200 grams of distilled water are added in 500 milliliters of reaction bulbs, opens stirring, then sequentially adds 12 grams of sesbania gum, xanthan
15 grams of glue, 12 grams, 5 grams ammonium polyphosphate (NH of Sodium Polyacrylate4)16P14O43, 3 grams of ammonium polyphosphate (NH4)18P16O49, sodium abietate 20
Gram, 20 grams of polyethylene glycol 10000 and 13 grams of PEG 20000s, and reaction system is gradually heating to 80 DEG C, continues to stir
2h, until all dissolvings, are then cooled to 50 DEG C, discharging is dried in vacuo, and is obtained head product, is sieved, obtains 20-60
Mesh diverting agent.Or head product is heated by screw extruder and melts and squeezes out, it is cut and is granulated with comminutor, be shaped to grain size
In the particle of 5-8mm, the temporary plugging ball of 5-25mm can also be machined to injection molding.The diverting agent of this method synthesis is suitable for 120
DEG C or more shale gas well temporarily block up construction.
Embodiment 3
Diverting agent prepared by embodiment 2 is added in fracturing fluid, diverting agent performance is measured.It is preferred that temporarily blocking up slippery water pressure break
Formula of liquid：+ 5% powder diverting agent of+0.2% clay stabilizer of+0.1% cleanup additive of 0.1% drag reducer.Under the conditions of 120 DEG C into
Row experiment, diverting agent the performance test results are shown in Table 1.
1. diverting agent the performance test results of table (120 DEG C)
| Project | Index |
| Degradation time, h | 22 |
| Degradation rate, % | 100 |
| Temporarily stifled rate, % | 98 |
| Compression strength, MPa | 82 |
| Recovery of core permeability, % | 97 |
| Breaking glue solution surface tension after dissolving, mN/m | 24.4 |
| Breaking glue solution anti-dilative after dissolving, % | 87.9 |
Embodiment 4
Diverting agent prepared by embodiment 2 is added in fracturing fluid, diverting agent performance is measured.It is preferred that the smooth hydraulic pressure of diverting agent
Split formula of liquid：+ 3% diverting agent powder+3% of+0.2% clay stabilizer of+0.1% cleanup additive of 0.1% drag reducer temporarily blocks up particle.
It is tested under the conditions of 150 DEG C, diverting agent the performance test results are shown in Table 2.
2. diverting agent the performance test results of table (150 DEG C)
| Project | Index |
| Degradation time, h | 36 |
| Degradation rate, % | 100 |
| Temporarily stifled rate, % | 98.4 |
| Compression strength, MPa | 84 |
| Recovery of core permeability, % | 97.3 |
| Breaking glue solution surface tension after dissolving, mN/m | 23.9 |
| Breaking glue solution anti-dilative after dissolving, % | 89.7 |
Embodiment 5
Diverting agent prepared by the present invention is applied in specific shale gas well fracturing.It is preferred that Weiyuan H3-1 well high stress difference allusion quotations
Type case.Completion situation is shown in Table 3, and production string situation is shown in Table 4.
3. completion situation of table
4. production string situation of table
Well logging is as a result, be shown in Fig. 2：It can obtain, for Reservoir Section Young's modulus in 26-34GPa or so, Poisson's ratio 0.2-0.22 is left
The right side, minimum horizontal principal stress 72-76MPa or so, minimum horizontal principal stress gradient 23.5-25KPa/m.Maximum and minimum level master
Stress difference reaches 15MPa or so.
Condition of construction：On October 27th, 2014, shale gas Weiyuan H3-1 wells completed 19 sections of pressure breaks to during November 10
Construction, injects 39000 side of liquid altogether, and 4.4 tons of high intensity water solubility diverting agent is added at 12 sections in 2100 tons of haydite altogether.
Diverting agent service condition is shown in Table 5.
5. diverting agent service condition of table
General effect：Weiyuan H3-1 wells are divided into 19 sections of pressing crack constructions, wherein it is 12 sections that high intensity water solubility diverting agent, which is added,
Overall fracturing transformation effect is fine, and total transformation volume is 1.08 hundred million sides.It is found by underground micro-seismic monitoring (see Fig. 3)：Add
Formation volume crack is obvious after entering diverting agent, illustrates that temporarily block up volume fracturing is significantly increased fracture network to shale gas pressure break
Effect.
In conclusion in shale gas fracturing process, in order to overcome high stress poor, change the flow direction of original liquid to reach
The purpose for generating new crack, the invention discloses for the temporary stall of shale gas well fracturing to high-strength temporary blocking agent, to diverting agent
Solubility property test is carried out in fracturing fluid, and is carried out rock core and temporarily blocked up and restore experiment test.Test result shows the diverting agent
It is completely dissolved in different temperatures fracturing fluid environment, noresidue solid, degradation rate 100%.Diverting agent dosage 3- in fracturing fluid
When 10%, rock core temporarily blocks up rate and can reach 95-98%, and recovery of core permeability can reach 97-99% after diverting agent degradation.It is temporarily stifled
The shale gas well that agent is suitable for 120 DEG C or more temporarily blocks up construction.Therefore the present invention diverting agent not only have good temporary stall to
Effect, and to formation damage very little after degradation.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as being the content without departing from technical solution of the present invention, according to the technical essence of the invention
To any simple modification, equivalent change and modification made by above example, in the range of still falling within technical solution of the present invention.
Claims (9)
1. a kind of shale gas pressure break overcome high stress difference temporarily stall to diverting agent, which is characterized in that the diverting agent is by raw material group
Divide natural plant gum, Sodium Polyacrylate, ammonium polyphosphate, sodium abietate and polyethylene glycol to carry out reaction to be made.
2. shale gas pressure break as described in claim 1 overcome high stress difference temporarily stall to diverting agent, which is characterized in that each original
Expect that component presses following mass percentage composition：Natural plant gum 25-30%, Sodium Polyacrylate 10-15%, ammonium polyphosphate 5-10%, pine
Fragrant acid sodium 20-25%, polyethylene glycol 30-35%.
3. shale gas pressure break as claimed in claim 2 overcome high stress difference temporarily stall to diverting agent, which is characterized in that it is described
Natural plant gum includes at least one of xanthans, sesbania gum, flax gum, fenugreek gum.
4. shale gas pressure break as claimed in claim 3 overcome high stress difference temporarily stall to diverting agent, which is characterized in that it is described
The general molecular formula of ammonium polyphosphate is (NH4)(n+2)PnO(3n+1), n is at least one of the integer of 10-20.
5. shale gas pressure break as claimed in claim 4 overcome high stress difference temporarily stall to diverting agent, which is characterized in that it is described
Polyethylene glycol is at least one of PEG4000, PEG8000, PEG10000, PEG20000.
6. shale gas pressure break as claimed in claim 5 overcome high stress difference temporarily stall to diverting agent, which is characterized in that this is temporarily
The shale gas well that blocking agent is suitable for 120 DEG C or more temporarily blocks up construction.
7. a kind of shale gas pressure break as claimed in any one of claims 1 to 6 overcome high stress difference temporarily stall to diverting agent
Preparation method, which is characterized in that include the following steps：A certain amount of distilled water is added in the reaction vessel, plant is then added
Glue, Sodium Polyacrylate, ammonium polyphosphate, sodium abietate and polyethylene glycol, stirring, and reaction solution is warming up to 80 DEG C, continue constant temperature
2h is stirred, until all dissolvings, then 50 DEG C are cooled to, discharging is dried in vacuo, and head product is obtained.
8. shale gas pressure break as claimed in claim 7 overcomes high stress difference, temporarily stall is special to the preparation method with diverting agent
Sign is, includes the following steps：A certain amount of distilled water is added in the reaction vessel, opens stirring, then sequentially adds sesbania
Glue, xanthans, Sodium Polyacrylate, (NH4)16P14O43、(NH4)18P16O49, sodium abietate, PEG10000 and PEG20000, and will
Reaction solution is warming up to 80 DEG C, continues constant temperature and stirs 2h, until all dissolvings, then 50 DEG C are cooled to, discharging is dried in vacuo, and is obtained
To head product, head product is sieved to obtain 20-60 mesh diverting agents, can also be processed into particle or sphere.
9. shale gas pressure break as claimed in claim 8 overcomes high stress difference, temporarily stall is special to the preparation method with diverting agent
Sign is that the head product is heated by screw extruder and melts and squeeze out, and is cut and is granulated with comminutor, is shaped to grain size in 5-
The diverting agent particle of 8mm, or it is machined to the temporary plugging ball of 5-25mm with injection molding.
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| CN201711330414.0A CN108300442B (en) | 2017-12-13 | 2017-12-13 | Temporary plugging agent for shale gas fracturing to overcome high stress difference temporary plugging steering and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111607366A (en) * | 2020-06-09 | 2020-09-01 | 粤久久食品科技(江门)有限公司 | Plugging agent for drilling fluid and preparation method thereof |
| CN115820232A (en) * | 2022-12-07 | 2023-03-21 | 四川劳恩新材料科技有限公司 | Preparation method of biodegradable temporary plugging agent for deep well |
| CN116064013A (en) * | 2022-12-01 | 2023-05-05 | 重庆页岩气勘探开发有限责任公司 | Temporary plugging agent for shale gas exploitation fracturing and preparation method thereof |
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| CN1858147A (en) * | 2006-01-26 | 2006-11-08 | 东营盛世石油科技有限责任公司 | Oil well sand washing plugging agent and plugging method |
| CN103788936A (en) * | 2013-11-08 | 2014-05-14 | 东方宝麟科技发展(北京)有限公司 | High-strength temporary blocking agent for oil and gas wells and preparation method and application thereof |
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2017
- 2017-12-13 CN CN201711330414.0A patent/CN108300442B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858147A (en) * | 2006-01-26 | 2006-11-08 | 东营盛世石油科技有限责任公司 | Oil well sand washing plugging agent and plugging method |
| CN103788936A (en) * | 2013-11-08 | 2014-05-14 | 东方宝麟科技发展(北京)有限公司 | High-strength temporary blocking agent for oil and gas wells and preparation method and application thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111607366A (en) * | 2020-06-09 | 2020-09-01 | 粤久久食品科技(江门)有限公司 | Plugging agent for drilling fluid and preparation method thereof |
| CN116064013A (en) * | 2022-12-01 | 2023-05-05 | 重庆页岩气勘探开发有限责任公司 | Temporary plugging agent for shale gas exploitation fracturing and preparation method thereof |
| CN115820232A (en) * | 2022-12-07 | 2023-03-21 | 四川劳恩新材料科技有限公司 | Preparation method of biodegradable temporary plugging agent for deep well |
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Address after: Room 807a, 8th floor, science and Technology Park building, Southwest Petroleum University, No.8 Xindu Avenue, Xindu District, Chengdu, Sichuan 610000 Applicant after: Jetbeton Petroleum Technology Group Co.,Ltd. Address before: 610000 no.1105-108, Section 1, Xingye Avenue, Xindu District, Chengdu, Sichuan Province Applicant before: Jetbeton Petroleum Technology Group Co.,Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |