CN114634807A - Multifunctional ionic polymer clay stabilizer for fracturing fluid - Google Patents

Multifunctional ionic polymer clay stabilizer for fracturing fluid Download PDF

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CN114634807A
CN114634807A CN202210227492.2A CN202210227492A CN114634807A CN 114634807 A CN114634807 A CN 114634807A CN 202210227492 A CN202210227492 A CN 202210227492A CN 114634807 A CN114634807 A CN 114634807A
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clay
polymer
acrylamide
sand
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王屾
房超
周晓东
蒋世海
刘琳
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Xinjiang Zhongling Engineering Technology Co ltd
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Abstract

The invention discloses a multifunctional ionic polymer clay stabilizer for fracturing fluid, which comprises dimethyl diallyl ammonium chloride and acrylamide, wherein the dimethyl diallyl ammonium chloride is a quaternary ammonium salt which has strong water solubility and contains two unsaturated bonds, has high cation density and is easy to generate homopolymerization or copolymerization with other monomers, the acrylamide and a cation monomer are copolymerized and coupled to synthesize an anti-swelling sand inhibitor for deep sand stabilization, or a part of hydrolyzed polyacrylamide is reacted with formaldehyde and polyethylene polyamine, polydimonium N-ethyl acrylamide and other components are compounded to obtain a multifunctional cationic polymer system, the system has strong oil/water/solid separation capacity, the adhesion work of crude oil on the surface of sandy soil can be reduced, and the crude oil can not be adhered on the surface of the sandy soil, quickly separating oil, water and sand; the clay can not expand in water, thereby reducing stratum expansion and sand production and playing a role in sand consolidation and prevention.

Description

Multifunctional ionic polymer clay stabilizer for fracturing fluid
Technical Field
The invention belongs to the technical field of stabilizers, and particularly relates to a multifunctional ionic polymer clay stabilizer for a fracturing fluid
Background
Clay minerals are mostly layered structures composed of silicon-oxygen tetrahedrons and aluminum-oxygen octahedrons. Wherein the montmorillonite is composed of two layers of silicon-oxygen tetrahedrons sandwiching one layer of aluminum-oxygen octahedron, the interlayer surface is oxygen layer, the connection force is weak, when contacting with water, water can enter between crystal layers, exchangeable cations on the crystal layer surface are dissociated and diffused in water to form a diffusion double electric layer, so that the surface charged crystal layers repel each other to generate expansion, therefore, the montmorillonite belongs to the expansive clay mineral.
Clay swelling may cause a decrease in formation permeability. Kaolinite, illite and chlorite are generally non-expansive clay minerals, because hydrogen bonds are easily formed between layers and the connection is tight, water is not easy to enter between layers, or because the cation exchange capacity is very small, water cannot cause expansion. Under the flushing of formation fluid, the non-swelling clay can be dispersed into flaky particles to be transported and enter the pores of the formation to block the throat and reduce the permeability of the formation.
Disclosure of Invention
The technical scheme provided by the invention is as follows: a multifunctional ionic polymer clay stabilizer for fracturing fluid is prepared from anionic silicon dioxide particles and cationic silicon dioxide particles including dimethyl diallyl ammonium chloride and acrylamide, which is a quaternary ammonium salt containing two unsaturated bonds and having high water solubility and high cationic density, and can be easily homopolymerized or copolymerized with other monomers through copolymerization initiated by dimethyl diallyl ammonium chloride and acrylamide at the ratio of 1:5, aqueous solution polymerization, organic phase solution polymerization and precipitation polymerization, reverse phase emulsion polymerization and suspension polymerization, copolymerization and coupling of acrylamide and cationic monomer to obtain anti-swelling sand inhibitor for deep sand stabilization, or reaction of partially hydrolyzed polyacrylamide with formaldehyde and polyethylene polyamine, and poly-dimethylamino-N-ethyl acrylamide, the poly (dimethylamino) N-ethyl acrylamide is compounded with other components to obtain a multifunctional cationic polymer system, and the system has strong oil/water/solid separation capacity, can reduce the adhesion work of crude oil on the surface of sandy soil, enables the crude oil not to adhere on the surface of sandy soil and quickly separates oil, water and sand; the clay can not expand in water, thereby reducing stratum expansion and sand production and playing a role in sand consolidation and prevention.
The invention has the technical effects and advantages that: the reticular polyhydroxy cationic polymer type anti-swelling sand-inhibiting agent with strong clay stabilization sand-inhibiting capability can effectively prevent the damage to the stratum and is suitable for being applied to medium and high permeability heavy oil reservoirs. Compared with the common cationic stabilizer, the net structure of the polyhydroxy cationic polymer enables the density of an adsorption film to be higher, the acting force to be stronger, and the polyhydroxy cationic polymer can prevent the dispersion and migration of water expansion type and non-water expansion type clay minerals; the polyhydroxy of the polymer can also form a large amount of hydrogen bonds with the hydroxyl on the surface of the hydroxylated stratum, so that the two are combined more firmly, and a longer stabilizing effect is achieved.
Drawings
FIG. 1 is a schematic diagram of the structure of clay microlayers of the present invention without the addition of a stabilizer.
FIG. 2 is a schematic diagram of the micro-layer structure of the clay after adding the stabilizer according to the present invention.
Detailed Description
A multifunctional ionic polymer clay stabilizer for fracturing fluids comprises anionic silica particles and cationic silica particles, wherein the size and shape of the anionic silica particles can be set to be suitable for the interstitial space of a stratum and attached to the exposed and positively charged surface of the clay particles in the covered stratum, and the amount of the anionic silica particles can be adjusted according to the amount and material composition of the clay contained in the stratum.
The cationic silicon dioxide particles comprise dimethyl diallyl ammonium chloride and acrylamide, the dimethyl diallyl ammonium chloride is a quaternary ammonium salt which has strong water solubility and contains two unsaturated bonds, the cationic density is high, the homopolymerization reaction or the copolymerization reaction with other monomers can be easily carried out, the relative molecular mass is 161.5, and the structural formula is as follows:
dimethyl diallyl ammonium chloride
Figure BDA0003536688780000021
Common name Diallyl dimethyl ammonium chloride Name of English Diallyldimethylammonium chloride
CAS number 7398-69-8 Molecular weight 161.672
Density of (25℃)＝1.04 Boiling point 100℃
Molecular formula C8H16ClN Melting Point 140-148℃
MSDS Chinese edition Flash point N/A
Acrylamide
Figure BDA0003536688780000031
Common name Acrylamide Name of English Acrylamide
CAS number 79-06-1 Molecular weight 71.08
Density of 1,322g/cm3 Boiling point 125℃25 mm Hg(lit.)
Molecular formula C3H5NO Melting Point 82-86℃(lit.)
MSDS Chinese edition Flash point 138℃
The compound initiation copolymerization is carried out by dimethyl diallyl ammonium chloride and acrylamide according to the mass ratio of 1:5, and the compound initiation copolymerization can be carried out by aqueous solution polymerization, organic phase solution polymerization and precipitation polymerization, inverse emulsion polymerization and suspension polymerization.
The multifunctional cationic polymer system is prepared by copolymerizing and coupling acrylamide and cationic monomer to synthesize an anti-swelling sand inhibitor for deep sand stabilization, or reacting partially hydrolyzed polyacrylamide with formaldehyde and polyethylene polyamine, and compounding poly (dimethylamino) N-ethyl acrylamide, poly (dimethylamino) N-ethyl acrylamide and other components, and has strong oil/water/solid separation capacity, so that the adhesion work of crude oil on the surface of sandy soil can be reduced, the crude oil cannot adhere on the surface of sandy soil, and oil, water and sand can be quickly separated; the clay can not expand in water, thereby reducing stratum expansion and sand production and playing a role in sand consolidation and prevention.
Polyethylene polyamines
Figure BDA0003536688780000041
Common name Polyethylene polyamines Name of English Polyamine N7
CAS number 29320-38-5 Molecular weight N/A
Density of 1.08g/mL at 25℃ Boiling point 250℃
Molecular formula (C2H4Cl2H3N)x Melting point N/A
MSDS N/A Flash point >110℃
Poly (dimethylamino) N-propylacrylamide
Figure BDA0003536688780000042
Common name Dimethylamino propyl acrylamide Name of English N,N-Dimethylaminopropyl acrylamide
CAS number 3845-76-9 Molecular weight 156.22500
Density of 0.80g/mL at 20℃ Boiling point 142℃/12mmHg
Molecular formula C8H16N2O Melting point -37℃
MSDS N/A Flash point 140℃
PTA (epichlorohydrin and secondary amine condensation polymer)
Figure BDA0003536688780000051
Common name Terephthalic acid, terphthalic acid Name of English terephthalic acid
CAS number 100-21-0 Molecular weight 166.133
Density of 1.55g/cm3。 Boiling point 572℃ at 760mmHg
Molecular formula C8H6O4 Melting point 300℃
MSDS Chinese edition Flash point 313.8℃
The dimethyl diallyl ammonium chloride and acrylamide copolymer is a small cationic polyelectrolyte with the intrinsic viscosity of more than 140mL/g, when the mass fraction of the small cationic polyelectrolyte is 0.5-1%, the small cationic polyelectrolyte is compounded with a large cationic electrolyte PTA (epichlorohydrin and secondary amine condensation polymer), so that a well completion fluid with good performance is obtained, and the well completion fluid containing the cationic electrolyte can ensure that clay does not expand basically.
The copolymer of dimethyl diallyl ammonium chloride and allyl amide and the homopolymer of dimethyl diallyl ammonium chloride can inhibit the decomposition and dispersion of clay, and the cationic copolymer can inhibit the hydration swelling of clay better than the homopolymer.
3-epoxypropyltrimethylammonium chloride
Figure BDA0003536688780000061
Common name 2, 3-epoxypropyltrimethylammonium chloride Name of English UNII:283XH39M8X
CAS number 3033-77-0 Molecular weight 151.635
Density of 1.13g/mL at 20℃(lit.) Boiling point N/A
Molecular formula C6H14ClNO Melting Point N/A
MSDS N/A Flash point 170℃
When the cationic polymer synthesized by the reaction of the 3-epoxypropyltrimethylammonium chloride and the starch is used as a mud treatment agent of the drilling fluid, the polymer has strong fluid loss reduction capability, strong salt resistance and good anti-collapse effect, and represents good application prospect. Meanwhile, the cationic polymer is found to have certain water loss reducing capacity in drilling mud, and although the cationic polymer has no strong water loss reducing capacity of hydroxymethyl starch, the anti-collapse effect of the cationic polymer is obviously enhanced.
In another configuration, the cation polyelectrolyte anti-swelling sand-inhibiting agent with the quaternary ammonium salt on the side chain is prepared by directly reacting epichlorohydrin with dimethylamine, has large electric charge and small relative molecular mass, and has the anti-swelling sand-inhibiting mechanism mainly based on neutralization electric property and assisted by bridging action.
Epoxy chloropropane
Figure BDA0003536688780000071
Common name Epoxy chloropropane Name of English epichlorohydrin
CAS number 106-89-8 Molecular weight 92.524
Density of 1.2±0.1g/cm3 Boiling point 116.1±0.0℃ at 760mmHg
Molecular formula C3H5ClO Melting Point -57℃
MSDS Chinese edition American edition Flash point 33.9±0.0℃
Dimethylamine
Figure BDA0003536688780000072
Common name Dimethylamine Name of English Dimethylamine
CAS number 124-40-3 Molecular weight 45.084
Density of 0.6±0.1g/cm3 Boiling point 6.1±3.0℃ at 760mmHg
Molecular formula C2H7N Melting Point -93℃(lit.)
MSDS Chinese edition Flash point -56.1±8.8℃
The viscosity reducer is a zwitterionic polymer clay stabilizing viscosity reducer, HP (DM DAAC/AM), wherein HP is a hydrolysate of a dimethyl diallyl ammonium chloride-acrylamide copolymer, has strong diluting capacity on a mixed metal hydroxide M MH-bentonite slurry system, and has strong inhibition on clay expansion in the system.
Preparing a zwitterionic soil stabilizer component, namely a quadripolymer of sodium allylsulfonate, diethyldiallyl ammonium chloride, acrylic acid and Acrylamide (AH); the viscosity reduction rate of the DS M with addition of 011 percent can reach 84 percent (fresh water mud) and 60 percent (4 percent brine mud), and the viscosity reduction agent has good inhibition, calcium resistance and heat resistance of 120 ℃. The zwitterion viscosity reducer is formed by copolymerizing a plurality of anionic, nonionic and cationic allyl monomers; the viscosity reducing agent has good viscosity reducing effect on polymer drilling fluid (field test) with different densities (rho: 1102-1180 g/cm3), and has obvious inhibitive performance. The amphoteric ionic polymer inhibitor has better anti-swelling property and flocculation property than polyacrylamide with the same polymerization degree.
Sodium allylsulfonate
Figure BDA0003536688780000081
Common name Sodium allylsulfonate Name of English Sodium allylsulfonate
CAS number 2495-39-8 Molecular weight 144.125
Density of 1.206 Boiling point N/A
Molecular formula C3H5NaO3S Melting point 0℃
MSDS Chinese edition American edition Flash point 144.124℃
Acrylic acid
Figure BDA0003536688780000082
Common name of Acrylic acid Name of English Acrylic acid
CAS number 79-10-7 Molecular weight 72.063
Density of 1.1±0.1g/cm3 Boiling point 141.0±0.0℃ at 760
Molecular formula C3H4O2 Melting Point 13℃(lit.)
MSDS Chinese edition American edition Flash point 54.4±0.0℃
Acrylamide (AH)
Figure BDA0003536688780000091
Common name Acrylamide Name of English (2H3)-2-Propenamide
CAS number 122775-19-3 Molecular weight 74.096
Density of 1.0±0.1g/cm3 Boiling point 231.7±0.0℃ at 760mmHg
Molecular formula C3H2D3NO Melting Point 82-86℃(lit.)
MSDS Chinese edition American edition Flash point 79.0±19.8℃
The filtrate reducer synthesized by M AOPS (2-acryloyloxy-2-methylpropanesulfonic acid), AM and AA has stronger filtrate reducing effect in various drilling fluid systems, stronger viscosity-increasing and cutting capacity, stronger temperature resistance, salt resistance and calcium resistance, good thermal stability and stronger inhibition, and can effectively control the hydration and dispersion of the shale, control the content of bentonite and solid phase and prevent the formation collapse.
The zwitterionic salt-resistant calcium-resistant fluid loss additive 1 is prepared by copolymerizing a neutral monomer acrylamide, a cationic monomer dimethyl diallyl ammonium chloride and an anionic monomer sodium acrylate in an aqueous solution by using a sodium sulfite-potassium persulfate redox system, and the zwitterionic salt-resistant calcium-resistant fluid loss additive 1 has the advantages of salt resistance, calcium resistance, strong inhibition and certain fluid loss reduction performance.
A zwitterionic salt-resistant calcium-resistant filtrate reducer 2 series, wherein the filtrate reducer is a quadripolymer of a nonionic monomer acrylamide, a cationic monomer dimethyl diallyl ammonium chloride, an anionic monomer sodium propylene sulfonate and methacrylic acid; compared with the zwitterion salt-resistant calcium-resistant filtrate reducer series 1, the zwitterion salt-resistant calcium-resistant filtrate reducer series 2 has stronger salt resistance, calcium resistance and filtrate reduction capability.
A zwitterionic fluid loss additive P (AW/AA/DM DAAC), which is copolymerized by dimethyl diallyl ammonium chloride, acrylamide and acrylic acid; it has obvious fluid loss reducing effect and excellent collapse preventing effect.
Zwitterionic fluid loss additives P (HMOPTA/AM/AA), P (APDAC/AM/AA), P (MPTM A/AA/AM) and CG S-2. They have strong filtration reducing effect in fresh water mud, salt water mud and artificial seawater mud, strong temperature resistance and obvious anti-collapse effect.
Terpolymer of amphoteric ionic polymer thickener acrylamide, sodium 2-acrylamido-2-methylpropanesulfonate and methacryloxypropyl-dimethyl-2-hydroxypropyl ammonium sulfate (MAPDM DHPAS). The amphoteric polymer thickening agent has the remarkable characteristics of high temperature resistance and strong salt resistance, and compared with fracturing fluid prepared from polyacrylamide, the viscosity loss of the fracturing fluid at high temperature is quite large. Therefore, amphoteric polymers with appropriate molecular structure (including relative molecular mass size, number of charged groups) are particularly useful as water-based fracturing fluid viscosifiers for high-mineral, high-temperature reservoirs.
The novel plugging modifier of the amphoteric association polymer/organic chromium gel has the characteristics of adjustable gelling time, excellent salt tolerance, high compressive strength, good stability and the like, and is suitable for high-salinity and fractured complex oil reservoirs.
In summary, the multifunctional ionic polymer clay stabilizer for fracturing fluid of the invention can: in order to solve the phenomenon of rapid increase of the viscosity of the drilling fluid caused by the nonionic polyether surfactant, the synthesis and application research of a plurality of pairs of cationic polyvinyl alcohol shows that the cationic polymer shale has good inhibition, no fluorescence interference and low tackifying negative effect, and is an anti-sloughing agent for the drilling fluid with excellent anti-sloughing performance.
Overcomes the defect that the cationic polymer drilling fluid needs cationic polymers and also needs other additives such as a tackifier, a filtrate reducer and the like.
The organic cation polymer mixture has several cation groups in the molecule chain, and can be adsorbed onto the exchange points of clay strongly in network form and adsorbed onto the surface of clay firmly through the action of intermolecular force, hydrogen bond force, etc. The method has the functions of obviously preventing the clay mineral in the reservoir from hydration expansion and dispersion migration, and greatly improves the apparent water absorption index of oilfield flooding. The composite material is suitable for high-permeability and low-permeability oil-gas layers, has a rigid structure, can enter clay mineral layers, and achieves high-efficiency and stable effects under the action of various chemical forces.
The reticular polyhydroxy cationic polymer type anti-swelling sand-inhibiting agent with strong clay stabilization sand-inhibiting capability can effectively prevent the damage to the stratum and is suitable for being applied to medium and high permeability heavy oil reservoirs. Compared with the common cationic stabilizer, the net structure of the polyhydroxy cationic polymer enables the density of an adsorption film to be higher, the acting force to be stronger, and the polyhydroxy cationic polymer can prevent the dispersion and migration of water expansion type and non-water expansion type clay minerals; the polyhydroxy of the polymer can also form a large amount of hydrogen bonds with the hydroxyl on the surface of the hydroxylated stratum, so that the two are combined more firmly, and a longer stabilizing effect is achieved. It follows that the cationic polymer has a high degree of crosslinking as an anti-swelling sand-suppressing agent.
The cationic polymer can not only prevent the hydration expansion of the clay, but also can shrink the volume of the clay particles which are hydrated and expanded. The cationic group of the polymer has oxidability under acidic condition, can loosen the clay crystal lattice containing absorbed water, remove the absorbed water molecules, cause the volume shrinkage of the clay particles which absorb water expansion, and form capillary channels among the particles; in addition, the hydration energy of the polymer cation is lower than that of monovalent and divalent inorganic cations in water, such as Na +, Ca2+, and the like, and the polymer cation can be adsorbed on the clay in preference to the inorganic cations to promote the clay particles to remove interlayer water to form a compact lattice structure, so that the hydration and expansion of the clay are effectively inhibited; in addition, the polymer contains hydrated groups, has sufficiently high relative molecular mass, large molecular coil expansion capacity and proper molecular shape, can be adsorbed on a plurality of clay particles through hydrogen bond force or electrostatic force to form bridging, and thus prevents the clay particles from being dispersed.
Hydraulic fracturing is an important measure for oil and gas production increase. The use of viscosifiers is a critical factor in the formation of well-behaved water-based fracturing fluid systems. Natural plant gum and derivatives thereof, cellulose derivatives and polyacrylamide are the main thickeners studied and applied at home and abroad at present.
The polymer electrolyte has ionic conductivity, substances with ionizable groups on polymer chains are often linked by covalent bonds, and the polymer electrolyte has charges on the chains and can conduct electricity like liquid.
The drilling fluid and the completion fluid in the oil extraction process use high-molecular cationic polymers as clay coating inhibitors and small-molecular cationic polymers as clay stabilizers. The basic slurry preparation material in the drilling fluid is clay, the clay is electronegative, and the cationic polyelectrolyte has higher positive charge and strong neutralization capacity, and can be tightly adsorbed on the surface of the clay, so that the specific surface area and the surface charge density of the clay are greatly reduced, the hydration and the migration of the clay are reduced, and the stability of a well bore is effectively improved; meanwhile, the cationic polymer can also coat the shale, so that the shale is prevented from being dispersed, and the formation pulping is inhibited. The long chain of the polymer not only increases the effect strength of the coating, but also can generate multi-point adsorption through the long chain to plug cracks, thereby playing a role in preventing collapse.
Zwitterionic polymers
Zwitterionic polymers (also known as amphoteric polyelectrolytes) generally refer to polymers having both anionic and cationic groups on the polymer chain. The electrostatic interaction can be repulsive force or attractive force, and has obvious reverse polyelectrolyte effect on the aspect of solution property depending on the relative number of anionic and cationic groups in a molecular chain and the pH value of the solution "
The reason why the polymer reverse polyelectrolyte thickening mechanism generates the reverse polyelectrolyte effect can be considered to be that the inner salt bond formed between the groups with the same amount of positive and negative charges is damaged by the added micromolecule salt, so that the interaction of the macromolecular solvent is enhanced, the originally compact macromolecular clew is gradually expanded, and the viscosity is gradually increased.
As the content of the small molecular salt in the solution increases, the solubility of the polymer increases and the viscosity of the solution increases. The viscosifying effect of the polymer in the salt water drilling fluid is better than that of a common anionic or nonionic polymer viscosifying agent, when the number of positive and negative charge groups is equal, a remarkable reverse polyelectrolyte effect can be generated, and the viscosifying agent can be used for thickening high-temperature and high-salt water-based drilling fluids.
The zwitterionic polymer molecules introduce a certain amount of organic cationic groups into polymer molecular chains, and meanwhile, the polymer molecular chains also contain anionic groups and nonionic groups in a large proportion. The organic cation group neutralizes partial negative charge on the surface of the clay; on the other hand, the adsorption capacity of polymer molecules on the clay surface is enhanced, and the clay particles are coated by the association between polymer molecules while the charge on the clay surface is partially balanced. The polymer molecules have a large number of anionic groups and nonionic polar groups, and thicker hydration films and solvation layers can be formed around the groups, so that the hydration of free water molecules in the clay crystal layers is effectively weakened and prevented. Meanwhile, a large number of dissolution layers carried by the anionic groups and the nonionic polar groups can improve the coalescence stability of the system. Thus, the zwitterionic polymer has both strong ability to inhibit the hydration dispersion of clay particles and strong fluid loss.
The polymer has good viscosity reduction effect on slurry, and meanwhile, the small molecular polymer is associated by self molecules, so that the surface of clay particles is coated by the adsorption of a nonionic functional group and a hydrogen bond of the clay and the electrostatic adsorption of cations and the clay, and the hydration and dispersion of the clay are prevented. Therefore, the polymer viscosity reducer can play a viscosity reducing role, simultaneously can not weaken and even strengthen the inhibitive performance of a slurry system, can effectively inhibit clay from dispersing even when drilling a stratum with strong slurry making, and keeps the stability of the slurry performance.
As shown in figure 1, the clay micro-layer structure without adding stabilizer is schematic, the clay has electronegativity, water molecules are molecules with electric polarity, when they meet charge neutralization, water is absorbed into natural cracks of clay layers, and the water changes the stability among clay molecules, so that sand production, expansion and water locking are caused.
As shown in fig. 2, a schematic diagram of a clay micro-layer structure added with a stabilizer is shown, and a positively charged functional group containing a nitrogen element is added, so that the nitrogen element is adsorbed to the surface of the clay in preference to water molecules due to large electric quantity, the stability of the surface of the clay is improved, natural gaps of the clay are effectively protected, a clay pore roar structure is not changed, and the flow conductivity is effectively protected and even increased.

Claims (5)

1. The multifunctional ionic polymer clay stabilizer for the fracturing fluid is characterized in that: comprises anionic silica particles and cationic silica particles, wherein the cationic silica particles comprise dimethyl diallyl ammonium chloride and acrylamide, the dimethyl diallyl ammonium chloride is a quaternary ammonium salt which has strong water solubility and contains two unsaturated bonds, the cationic density is high, the homopolymerization reaction or the copolymerization reaction with other monomers is easy to occur,
the method is characterized in that dimethyl diallyl ammonium chloride and acrylamide are subjected to compound initiation copolymerization according to the mass ratio of 1:5, and the mixture can be subjected to aqueous solution polymerization, organic phase solution polymerization and precipitation polymerization, inverse emulsion polymerization and suspension polymerization, acrylamide and cationic monomers are subjected to copolymerization and coupling to synthesize an anti-swelling sand inhibitor for deep sand stabilization, or partially hydrolyzed polyacrylamide is reacted with formaldehyde and polyethylene polyamine, and poly (dimethylamino) N-ethyl acrylamide are compounded with other components to obtain a multifunctional cationic polymer system, wherein the system has strong oil/water/solid separation capacity, can reduce the adhesion work of crude oil on the surface of sandy soil, prevent crude oil from adhering on the surface of sandy soil, and quickly separate oil, water and sand; the clay can not expand in water, thereby reducing stratum expansion and sand production and playing a role in sand consolidation and prevention.
2. The multifunctional ionic polymer clay stabilizer for fracturing fluid of claim 1, characterized in that: the dimethyl diallyl ammonium chloride and acrylamide copolymer is a small cationic polyelectrolyte with the intrinsic viscosity of more than 140mL/g, when the mass fraction of the small cationic polyelectrolyte is 0.5-1%, the small cationic polyelectrolyte is compounded with a large cationic electrolyte epichlorohydrin and a secondary amine condensation polymer to obtain a well completion fluid with good performance, and the well completion fluid containing the cationic electrolyte can ensure that clay does not swell basically.
3. The multifunctional ionic polymer clay stabilizer for fracturing fluids according to claim 1, characterized in that: the cationic copolymer can better inhibit the hydration swelling of the clay than the homopolymer.
4. The multifunctional ionic polymer clay stabilizer for fracturing fluid of claim 1, characterized in that: when the cationic polymer synthesized by reacting 3-epoxypropyltrimethylammonium chloride with starch and 3-epoxypropyltrimethylammonium chloride with starch is used as a mud treatment agent of drilling fluid, the polymer has strong filtration reducing capability, strong salt resistance and good anti-collapse effect, shows good application prospect, and simultaneously finds that the cationic polymer has certain water loss reducing capability in drilling mud, and the anti-collapse effect is obviously enhanced although the water loss reducing capability of hydroxymethyl starch is not strong.
5. The multifunctional ionic polymer clay stabilizer for fracturing fluids according to claim 1, characterized in that: the viscosity reducer is characterized by also comprising sodium allylsulfonate, diethyldiallyl ammonium chloride, acrylic acid, quaternary copolymer of sodium allylsulfonate, diethyldiallyl ammonium chloride, acrylic acid and acrylamide, wherein the DS M viscosity reduction rate with the addition of 011 percent can reach 84 percent and 60 percent, the viscosity reducer is good in inhibition, calcium-resistant and heat-resistant at 120 ℃, and the zwitterionic viscosity reducer is formed by copolymerizing multiple anionic, nonionic and cationic allyl monomers, has a good viscosity reduction effect on polymer drilling fluids with different densities, and is remarkable in inhibition.
CN202210227492.2A 2022-03-08 2022-03-08 Multifunctional ionic polymer clay stabilizer for fracturing fluid Pending CN114634807A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115895611A (en) * 2023-03-02 2023-04-04 克拉玛依友联实业有限责任公司 Amino polymer inhibitor for drilling fluid and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN104312575A (en) * 2014-10-31 2015-01-28 重庆科技学院 Efficient clay inhibitor for shale gas fracturing and preparation method of efficient clay inhibitor
CN113563510A (en) * 2021-08-09 2021-10-29 建平天正矿业有限公司 Temperature-resistant salt-resistant comb polymer fluid loss additive for drilling mud bentonite
CN113912774A (en) * 2021-10-29 2022-01-11 中海油天津化工研究设计院有限公司 Polymer clay stabilizer for fracturing and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104312575A (en) * 2014-10-31 2015-01-28 重庆科技学院 Efficient clay inhibitor for shale gas fracturing and preparation method of efficient clay inhibitor
CN113563510A (en) * 2021-08-09 2021-10-29 建平天正矿业有限公司 Temperature-resistant salt-resistant comb polymer fluid loss additive for drilling mud bentonite
CN113912774A (en) * 2021-10-29 2022-01-11 中海油天津化工研究设计院有限公司 Polymer clay stabilizer for fracturing and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115895611A (en) * 2023-03-02 2023-04-04 克拉玛依友联实业有限责任公司 Amino polymer inhibitor for drilling fluid and preparation method thereof
CN115895611B (en) * 2023-03-02 2023-05-16 克拉玛依友联实业有限责任公司 Amino polymer inhibitor for drilling fluid and preparation method thereof

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