CN109971455A - A kind of forming method of high-speed channel pressure break self aggregation proppant column - Google Patents
A kind of forming method of high-speed channel pressure break self aggregation proppant column Download PDFInfo
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- CN109971455A CN109971455A CN201711466865.7A CN201711466865A CN109971455A CN 109971455 A CN109971455 A CN 109971455A CN 201711466865 A CN201711466865 A CN 201711466865A CN 109971455 A CN109971455 A CN 109971455A
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- proppant
- pressure break
- forming method
- molecular material
- speed channel
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
- C09K8/805—Coated proppants
Abstract
The invention belongs to oil-gas field fracturing exploit field, and in particular to a kind of forming method of high-speed channel pressure break self aggregation proppant column, including step be (1) be surface-treated: proppant surface is handled to obtain strong cation type proppant and weak anionic type proppant；(2) pressure break: strong cation type proppant and weak anionic type proppant are pumped into oil/gas well with fracturing fluid according to a certain percentage, form proppant column.The present invention is fettered and is heated by proppant surface charge attraction, the winding of high molecular material main chain, fiber in fracturing process and tightened under quadruple effect, the pillar that the formation that the proppant in man-made fracture can be spontaneous consolidates, so that it is guaranteed that the effect of high-speed channel pressure break.
Description
Technical field
The invention belongs to oil-gas field fracturings to exploit field, and in particular to arrive a kind of high-speed channel pressure break self aggregation proppant column
Forming method.
Background technique
High-speed channel fracturing technique generally uses multistage perforation, pulse to add sand, with technologies such as note fibers, relies in crack
Discontinuous proppant pillar support crack, can not only form the crack of high flow conductivity, and reduce fracturing fluid, support
The dosage of agent, reduces formation contaminant, reduces cost.
The core of high-speed channel fracturing technique is that proppant can form effective proppant column in crack " reunion ".
There are mainly two types of methods at present, are fiber constraint proppant and chemical modification autohemagglutination proppant respectively.
Fiber fetters proppant technology, i.e., fiber is added while adding proppant into fracturing fluid, mechanism is
The addition of fiber can change the rheological property of proppant particles, increase the yield stress of sand group, prevent proppant in the wellbore
Dispersion reduces sinking speed of the proppant in fracturing fluid.In addition, fibroplastic interlaced network structure is to proppant
Grain has preferable constraint to act on, and after fracturing fluid recovery (backflow) crack closure, makes sand column intensity with higher and preferable stability.
Its defect is that long fibre can be fractured into staple fiber, greatly reduces the constraint performance to proppant particles.Meanwhile fiber mostly can
Degradation of fibers, therefore after its degradation, " sand column " just loses constraint, if reservoir stress changes at this time, additional fluid
Souring, the proppant to flow back may cause the blocking of hydrocarbon migration channel, reduce fracture condudtiviy.
Autohemagglutination proppant is then the mixed water injection coalescent when adding sand, after coalescent is contacted with sand grain surface, polarity main chain
It is intended to sprawl in proppant surface, hydrophobic branch chain mutually twines at separate sand grain surface from the alienation of polar mineral surface at this time
Around forming dense hydrophobic branch chain " cluster ", carbon atom adjacent at this time is mutually bonded, and forms unique " molecule hook lock system
Modified proppant is presented internal " uniting " in system ", such structure, the characteristic of external " attraction ".Autohemagglutination proppant at present
Defect be that coalescent is in conjunction with the surface of proppant and insecure, need in proppant surface precoating coupling agent, but difficult point
It is preferred suitable coupling agent.Since the development of matched technical equipment relatively lags behind, the research about autohemagglutination proppant is still
In the majority with laboratory experiment, field application is relatively fewer.
Summary of the invention
The purpose of the present invention is to solve the deficiencies in the prior art, provide a kind of high-speed channel pressure break autohemagglutination
Collect the forming method of proppant column.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of forming method of high-speed channel pressure break self aggregation proppant column, includes the following steps:
(1) it is surface-treated: strong cation high molecular material and weak anionic macromolecule material is respectively coated in proppant surface
Material, obtains strong cation type proppant and weak anionic type proppant；
(2) pressure break: strong cation type proppant and weak anionic type proppant are pumped into fracturing fluid according to a certain percentage
In oil/gas well, proppant column is formed.
The purpose of the present invention can also be achieved through the following technical solutions:
The forming method of the high-speed channel pressure break self aggregation proppant column carries out as follows:
(1) it is surface-treated: the strong cation high molecular material and weak yin with a thickness of 4-6 μm is respectively coated in proppant surface
Ion high molecular material obtains strong cation type proppant and weak anionic type proppant；
(2) pressure break: by strong cation type proppant and weak anionic type proppant by weight the ratio of 1:1 and containing fine
The fracturing fluid of dimension is pumped into oil/gas well, forms proppant column.
The weight of the fiber is the 5-8% of proppant weight, and fiber is thermosensitive fiber, length 5-8mm, outer diameter 15-
25μm。
The strong cation high molecular material ion degree is 20%-90%.
Preferably, the strong cation high molecular material ion degree is 50%-90%.
Preferably, the strong cation high molecular material ion degree is 60%-80%.
The strong cation high molecular material is Cationic Polymers Containing Quaternary Ammonium Salts.
The Cationic Polymers Containing Quaternary Ammonium Salts are dimethyl diallyl ammonium chloride, methylacryoyloxyethyl front three
One of ammonium chloride, the homopolymer of acrylyl oxy-ethyl-trimethyl salmiac or copolymer.
The weak anionic high molecular material degree of hydrolysis is 2%-20%.
Preferably, the weak anionic high molecular material degree of hydrolysis is 5%-10%.
The weak anionic high molecular material is acrylic acid-acrylamide copolymer, methacrylic acid-acrylic amide is total
One of polymers, 2- methyl -2- acryamidopropanesulfonic acid-acrylamide copolymer.
The present invention coats proppant, the proppant of two kinds of coating materials using strong cation and weak anionic high molecular material
It mixes in certain proportion, in fracturing fluid, high molecular material main chain sufficiently extends, under the action of charge, two kinds of proppants
It attracts each other close, main chain is mutually wound, composition support bolus；
Simultaneously with note thermosensitive fiber to fetter support bolus during pressure break, fiber has the spy crimped at high temperature
Property, under the influence of temperature, fiber crimp, make the proppant for being coated with strong positive and weak negative-type further towards, attract,
Mutually winding, support bolus more close and firm after formation temperature restores in crack, are acted on by " tightening " of fiber,
It supports bolus further secured, forms the proppant column that high-speed channel pressure break needs.
For the strong cation high molecular material that the present invention uses using C-C key flexible as main skeleton, side group is cationic base
Group.On the one hand this structure is conducive to strand in the abundant absorption and winding of proppant surface, on the other hand, highdensity sun
Ionic charge generates sufficiently strong attraction to weak negative high molecular material.
The weak anionic high molecular material used of the invention using C-C key as main skeleton, side group with a small amount of a kind of or
Several anionic groups of person are mutually drawn close with strong positive macromolecule and are wound agglomerating by the suction-operated of charge.
The present invention, which is fettered and is heated by proppant surface charge attraction, the winding of high molecular material main chain, fiber, tightens four
Under recast is used, the firm pillar of the formation that the proppant in man-made fracture can be spontaneous, so that it is guaranteed that the effect of high-speed channel pressure break.
Specific embodiment
Detailed description of the preferred embodiments by the following examples.It should be understood that this place
The specific embodiment of description is merely to illustrate and explain the present invention, and is not intended to limit the present invention, and the proppant that the present invention uses is
Haydite, quartz sand or other existing proppants, embodiment are illustrated with haydite, quartz sand.
The strength and stability of proppant column is ordered as embodiment 1 from high in the end, embodiment 2, embodiment 3, embodiment 4,
Embodiment 5, embodiment 6 are specific as follows.
A kind of forming method of the high-speed channel pressure break self aggregation proppant column of embodiment 1
It carries out as follows:
(1) it is surface-treated: the strong cation high molecular material and weak anionic with a thickness of 5 μm is respectively coated in haydite surface
High molecular material obtains strong cation type proppant and weak anionic type proppant；
(2) pressure break: by strong cation type proppant and weak anionic type proppant by weight the ratio of 1:1 and containing fine
The fracturing fluid of dimension is pumped into oil/gas well, forms proppant column；
The weight of the fiber is the 6% of proppant weight, and fiber is thermosensitive fiber, length 7mm, 20 μm of outer diameter；
The strong cation high molecular material is polydimethyl diallyl ammonium chloride, ion degree 70%；
The weak anionic high molecular material is acrylic acid-acrylamide copolymer, degree of hydrolysis 8%.
A kind of forming method of the high-speed channel pressure break self aggregation proppant column of embodiment 2
It carries out as follows:
(1) be surface-treated: by quartz sand surface be respectively coated with a thickness of 4 μm strong cation high molecular material and with a thickness of
6 μm of weak anionic high molecular materials obtain strong cation type proppant and weak anionic type proppant；
(2) pressure break: by strong cation type proppant and weak anionic type proppant by weight the ratio of 1:1 and containing fine
The fracturing fluid of dimension is pumped into oil/gas well, forms proppant column；
The weight of the fiber is the 5% of proppant weight, and fiber is thermosensitive fiber, length 8mm, 25 μm of outer diameter；
The strong cation high molecular material is polyacrylamide oxy-ethyl-trimethyl salmiac, ion degree 80%；
The weak anionic high molecular material is methacrylic acid-acrylic amide copolymer, degree of hydrolysis 5%.
A kind of forming method of the high-speed channel pressure break self aggregation proppant column of embodiment 3
It carries out as follows:
(1) be surface-treated: by quartz sand surface be respectively coated with a thickness of 6 μm strong cation high molecular material and with a thickness of
4 μm of weak anionic high molecular materials obtain strong cation type proppant and weak anionic type proppant；
(2) pressure break: by strong cation type proppant and weak anionic type proppant by weight the ratio of 1:1 and containing fine
The fracturing fluid of dimension is pumped into oil/gas well, forms proppant column；
The weight of the fiber is the 8% of proppant weight, and fiber is thermosensitive fiber, length 5mm, 15 μm of outer diameter；
The strong cation high molecular material is polymethyl acyloxyethyl trimethyl ammonium chloride, and ion degree is
60%；
The weak anionic high molecular material is 2- methyl -2- acryamidopropanesulfonic acid-acrylamide copolymer, water
Xie Du is 5%.
A kind of forming method of the high-speed channel pressure break self aggregation proppant column of embodiment 4
Difference with embodiment 1 is that the strong cation high molecular material is methylacryoyloxyethyl trimethyl ammonia chloride
Ammonium, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride are by quantity than the copolymer for 2:1, ion degree 50%；The weak yin
Ion high molecular material is methacrylic acid-acrylic amide copolymer, degree of hydrolysis 10%.
A kind of forming method of the high-speed channel pressure break self aggregation proppant column of embodiment 5
Difference with embodiment 1 is that the strong cation high molecular material is dimethyl diallyl ammonium chloride, methyl
Acrylyl oxy-ethyl-trimethyl salmiac, acrylyl oxy-ethyl-trimethyl salmiac are by quantity than the copolymer for 1:1:3, ion
Degree is 90%；
The weak anionic high molecular material is acrylic acid-acrylamide copolymer, degree of hydrolysis 20%.
A kind of forming method of the high-speed channel pressure break self aggregation proppant column of embodiment 6
Difference with embodiment 1 is that the strong cation high molecular material is dimethyl diallyl ammonium chloride, methyl
Acrylyl oxy-ethyl-trimethyl salmiac is by quantity than the copolymer for 10:1, ion degree 20%；
The weak anionic high molecular material is acrylic acid-acrylamide copolymer, degree of hydrolysis 2%.
Claims (11)
1. a kind of forming method of high-speed channel pressure break self aggregation proppant column, which comprises the steps of:
(1) it is surface-treated: strong cation high molecular material and weak anionic high molecular material is respectively coated in proppant surface, is obtained
To strong cation type proppant and weak anionic type proppant；
(2) strong cation type proppant and weak anionic type proppant pressure break: are pumped into oil gas with fracturing fluid according to a certain percentage
In well, proppant column is formed.
2. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 1, which is characterized in that by such as
Lower step carries out:
(1) it is surface-treated: the strong cation high molecular material and weak anionic with a thickness of 4-6 μm is respectively coated in proppant surface
High molecular material obtains strong cation type proppant and weak anionic type proppant；
(2) strong cation type proppant and weak anionic type proppant by weight the ratio of 1:1 and pressure break: are contained into fiber
Fracturing fluid is pumped into oil/gas well, forms proppant column.
3. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 2, which is characterized in that described
Fiber weight be proppant weight 5-8%, fiber is thermosensitive fiber, length 5-8mm, 15-25 μm of outer diameter.
4. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 1, which is characterized in that described
Strong cation high molecular material ion degree be 20%-90%.
5. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 4, which is characterized in that described
Strong cation high molecular material ion degree be 50%-90%.
6. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 5, which is characterized in that described
Strong cation high molecular material ion degree be 60%-80%.
7. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 1, which is characterized in that described
Strong cation high molecular material be Cationic Polymers Containing Quaternary Ammonium Salts.
8. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 7, which is characterized in that described
Cationic Polymers Containing Quaternary Ammonium Salts be dimethyl diallyl ammonium chloride, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, third
One of homopolymer or copolymer of alkene acyloxyethyl trimethyl ammonium chloride.
9. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 1, which is characterized in that described
Weak anionic high molecular material degree of hydrolysis be 2%-20%.
10. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 9, which is characterized in that institute
The weak anionic high molecular material degree of hydrolysis stated is 5%-10%.
11. the forming method of high-speed channel pressure break self aggregation proppant column according to claim 1, which is characterized in that institute
The weak anionic high molecular material stated is acrylic acid-acrylamide copolymer, methacrylic acid-acrylic amide copolymer, 2- first
One of base -2- acryamidopropanesulfonic acid-acrylamide copolymer.
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Cited By (1)
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| CN115678534A (en) * | 2021-07-29 | 2023-02-03 | 中国石油化工股份有限公司 | Proppant and preparation method and application thereof |
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Application publication date: 20190705 |