CN105860093A - Sodium humate plugging agent used for high temperature, high salinity and low permeability oil reservoir and preparation method thereof - Google Patents
Sodium humate plugging agent used for high temperature, high salinity and low permeability oil reservoir and preparation method thereof Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08H6/00—Macromolecular compounds derived from lignin, e.g. tannins, humic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- 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
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2399/00—Characterised by the use of natural macromolecular compounds or of derivatives thereof not provided for in groups C08J2301/00 - C08J2307/00 or C08J2389/00 - C08J2397/00
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Abstract
The invention relates to a sodium humate plugging agent used for a high temperature, high salinity and low permeability oil reservoir. A formula of the plugging agent comprises 21-23wt% of a polymer sodium humate, 2.5-3.5wt% of a crosslinking agent formaldehyde, 1.5-2.5wt% of an enhancer phenol and the balance of distilled water, and pH value is adjusted to be 8-10 by adopting NaOH standard solution with the concentration of 0.1mol/L. The invention also provides a preparation method of the sodium humate plugging agent. The sodium humate plugging agent has good high temperature resistance and high salinity resistance, temperature can reach 200 DEG C, mineralization degree can reach 80000mg/L (metered by 50000mg/L NaCl and 30000mg/L CaCl2), apparent viscosity of plugging agent gelling fluid is l.4mPa.s, the plugging agent is applicable to water plugging by profile control, gelling strength is high and can reach 0.095MPa, gelling time is controllable in 8-19 hours, and the plugging agent is low in cost, easy to prepare and good in pumpability.
Description
Technical field
The present invention relates to a kind of profile control and water plugging agent being applicable to high temperature and high salt low-permeability oil deposit and preparation method thereof, belong to
Oil gas field blocking agent technical field.
Background technology
Low permeability oil field has the exploitation rule that their own is special.Low permeability reservoir typically means that air permeability is less than 50
×10-3μm2Oil-bearing reservoir, its geology characteristic is that pore constriction is little.Low permeability oil field and the middle and high infiltration of routine
Rate oil field is compared, and is characterized in: the general poor continuity of low permeability pay, and recovery ratio is the closest with well spacing density relation；
There is " starting producing pressure differential phenomenon ", filtrational resistance and pressure and consume the biggest in low permeability pay；Low permeability oil field is shown in
After water, adopt liquid and productivity index drastically declines, oilfield stable production is caused serious threat；The general crack of low permeability oil field is all
Relatively grow, inject water and alter into extremely serious along crack.At present, the aqueous continuous rising of China's low permeability oil field, steady oil control
Water is the most imperative.Low permeability oil field is the battle position produced in China's oil industry increasing the storage, especially western low-permeability oil
Field.Western low permeability oil field has that reservoir depth is deep, formation temperature high, in the urgent need to develop be suitable to hypotonic
The high-temperature profile control water shutoff agent in oil field is to meet current oilfield exploitation requirement thoroughly.
Currently used profile-controlling and plugging agent is mainly based on gel-type, gel-type, and the height that gel plugging agent uses because of it
Molecularly Imprinted Polymer not resistant to shearing, easy shear degradation, so that its shut-off capacity is had a greatly reduced quality.
Chinese patent document CN103865510A (application number: 201410084960.0) discloses a kind of thermal recovery and injects
Well gel list liquid profile control agent and transfer drive method thereof, it is by nitro humus acid that well gel list liquid profile control agent is injected in this thermal recovery
Sodium, formaldehyde, resorcinol, HPAM formation water at normal temperatures dissolves the dark brown solution being mixed to form；The most each
Composition by weight is respectively as follows: nitro humus acid sodium 8wt%～10wt%, formaldehyde 2.1wt%, resorcinol
2.5wt%～2.75wt%, HPAM0.015wt%～0.035wt%；Nitro humus acid sodium is industrial nitro humus acid sodium.
This patent document mainly provides the formula of profile control agent, preparation and corresponding construction method and simply describes profile control agent
Partial properties, such as gelling temperature, becomes adhesiveness, heatproof and sealing ratiod, and does not provide corresponding experiment or theoretical foundation,
Gelation time and the gelling strength index of profile control agent are not provided the most yet, and the gelation time of blocking agent and gelling strength are stifled
Agent adaptability and the theoretical foundation of construction success or not thereof.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of sodium humate blocking agent for high temperature and high salt low-permeability oil deposit
And preparation method thereof.Present invention also offers the gel-forming property (gelation time, gelling strength) of blocking agent and heatproof, resistance to
Salt, the performance evaluation of acid and alkali-resistance and experimental basis, also provided is the initial viscosity of blocking agent solution.Of the present invention
Blocking agent solution is applicable to high temperature and high salt low-permeability oil deposit and adjusts stifled, and provides sufficient theoretical foundation.
Technical scheme is as follows:
A kind of sodium humate blocking agent for high temperature and high salt low-permeability oil deposit, including the raw material group of following mass percent
Become: sodium humate 21-23%wt, formaldehyde 2.5-3.5%wt, phenol 1.5-2.5%wt, remaining is water.
According to the invention it is preferred to, described sodium humate blocking agent, the raw material including following mass percent forms:
Sodium humate 21.5-22.5%wt, formaldehyde 2.5-3%wt, phenol 2-2.5%wt, remaining is water.
According to the invention it is preferred to, described sodium humate blocking agent, the raw material including following mass percent forms:
Sodium humate 22%wt, formaldehyde 3%wt, phenol 2.5%wt, remaining is water.
According to the invention it is preferred to, when the raw material composition mass percent of described sodium humate blocking agent is following, stifled
The apparent viscosity of agent gelled fluid is l.4mPa s: sodium humate 22%wt, formaldehyde 3%wt, phenol 2.5%wt, remaining
For water.
According to the invention it is preferred to, the pH of described sodium humate blocking agent is 8-10, further preferred pH=10.
According to the invention it is preferred to, described blocking agent is when temperature is 120-200 DEG C, and gelation time is in 8-19h, plastic
Intensity is 0.062-0.095MPa.
According to the invention it is preferred to, described blocking agent is at 50000mg/LNaCl and 30000mg/LCaCl2Salt-mixture
In solution, gelation time is at 8-14h, and gelling strength is 0.030-0.094MPa.
According to the invention it is preferred to, described blocking agent is when pH value is 8-11, and gelation time is at 13-16h, and plastic is strong
Degree is at 0.068-0.084MPa.
According to the present invention, the preparation method of the above-mentioned sodium humate blocking agent for high temperature and high salt low-permeability oil deposit, including step
Rapid as follows:
By the mass ratio of component each in formula, sodium humate, formalin, phenol are added to the water and are stirred until homogeneous,
The pH value of regulation mixed solution is 8-10, obtains the sodium humate blocking agent for high temperature and high salt low-permeability oil deposit.
Preparation in accordance with the present invention, it is preferred that regulation mixed solution pH agents useful for same is NaOH solution；Enter
One step is preferred, and the concentration of NaOH solution is 0.1mol/L.
Preparation in accordance with the present invention, needs in each component adition process to guarantee that each step is entered after being all stirred until homogeneous again
Row next step, each step is all advisable to stir, and mixing time is unsuitable long.
The gelling mechanism of sodium humate blocking agent of the present invention is as follows:
Sodium humate blocking agent of the present invention is a kind of gel-type blocking agent, and the sodium humate in blocking agent, as polymer, is
A kind of macromolecule organic monoacid sodium salt, its molecular structure complexity is unformed, containing various active group such as phenolic hydroxyl group, alcohol
Hydroxyl and enol base etc., the sodium humate molecule in blocking agent solution is fully extended, in chain structure；Formaldehyde conduct
Cross-linking agent, phenol reacts under formation conditions generate class tree as reinforcing agent, formaldehyde and phenol in blocking agent solution
Fat material (see formula I-1～I-3), active group phenolic hydroxyl group and methylol in this structure of matter can be with sodium humates
Active group generation condensation reaction in molecule, so that this molecule is handed over sodium humate chain-like molecular structure
Connection, these type of cross-linking reactions multiple make polymer chains molecules structure ultimately form stable spatial networks molecular structure,
Comparing the polymer chains molecules structure before crosslinking, it is bright with other composition i.e. contact area of hydrone in blocking agent solution
Aobvious increase, thus the contact area of unit volume hydrone and polymer molecular structure also significantly increases, due to hydrone
And it is to be attracted each other by the effect of the power such as hydrogen bond, intermolecular attraction or key between polymer spatial networks molecular structure,
Thus this adelphotaxy is also remarkably reinforced, so that polymer spatial networks molecular structure can be by hydrone
Firmly it is bound by wherein and makes it lose flowability, ultimately forming stable polymer water molecular structure, i.e. form tool
There is the sodium humate gel rubber system of some strength.
The feature of the present invention and having the beneficial effect that:
(1) blocking agent of the present invention is when temperature is 120-200 DEG C, and gelation time at 8-19h, gelling strength is
0.062-0.095MPa, gelation time is suitable, and gelling strength is higher.Blocking agent of the present invention has good high temperature resistant
Performance, and temperature applicable range is wider, it is possible in the high-temperature oil reservoir that temperature is 120-200 DEG C, realize deep migration,
Sealing characteristics is good.
(2) blocking agent salt tolerant of the present invention reach as high as 80000mg/L (with 50000mg/LNaCl and
30000mg/LCaCl2Meter), gelation time is at 8-14h, and gelling strength is 0.030-0.094MPa.Of the present invention
Blocking agent has good resistance to high salt energy, it is possible to realize preferably blocking to the reservoir in high salinity reservoirs.
(3) blocking agent of the present invention is when pH value is 8-11, and gelation time exists at 13-16h, gelling strength
0.068-0.084MPa, gelation time is suitable, and gelling strength is bigger.Blocking agent of the present invention depends under weak basic condition
So there is good gel-forming property, it is adaptable to the profile control and water plugging of alkalescence oil reservoir.
(4) blocking agent viscosity of the present invention is low, and the apparent viscosity of its optimization formula blocking agent gelled fluid is l.4mPa s, suitable
Profile control and water plugging for low-permeability oil deposit.
(5) blocking agent of the present invention be applicable to high temperature (120-200 DEG C), high salt (reach as high as 80000mg/L, with
50000mg/LNaCl and 30000mg/LCaCl2Meter), hyposmosis, the tune of alkalescence (pH value is 8-11) oil reservoir
Cut open water-blocking operation, as Thermal Recovery For Viscous Oil By Steam reservoir oil well, deep-well and in deep oil-water well and high salinity reservoirs oil
The profile control and water plugging of well etc., applied widely, it is possible to effectively to solve oil-gas reservoir reservoir under harsh conditions and improve injection production profile
A difficult problem.
(6) the raw materials used low cost of sodium humate blocking agent for high temperature and high salt low-permeability oil deposit provided by the present invention,
Preparation is simple, and blocking agent solution initial viscosity is low, easy construction, it is easy to infusion is to target zone position.
Accompanying drawing explanation
Fig. 1 is the gel pictorial diagram of sodium humate blocking agent in test example 1 of the present invention.
Fig. 2 is the relation that in test example 2 of the present invention, the gelation time of sodium humate blocking agent, gelling strength vary with temperature
Curve.
Fig. 3 be in test example 3 of the present invention the gelation time of sodium humate blocking agent, gelling strength with salinity (with NaCl
Meter) relation curve that changes.
Fig. 4 be in test example 3 of the present invention the gelation time of sodium humate blocking agent, gelling strength with salinity (with CaCl2
Meter) relation curve that changes.
Fig. 5 is the pass that in test example 4 of the present invention, the gelation time of sodium humate blocking agent, gelling strength change with pH value
It it is curve.
Detailed description of the invention
Below by specific embodiment and combine accompanying drawing the present invention will be further described, but it is not limited to this.
Primary drug: sodium humate (industrial goods 20 mesh), sodium hydroxide, formaldehyde, phenol, sodium chloride, calcium chloride
(being Chemical Reagent Co., Ltd., Sinopharm Group, analytical pure), distilled water.
Key instrument: electronic balance (BSA423S), pH meter (thunder magnetic PHS-3C), NDJ-7 rotating cylinder viscometer,
Mechanical stirring device, electric drying oven with forced convection, high-temperature tank, vacuum pump etc..
Embodiment: for the preparation of the sodium humate blocking agent of high temperature and high salt low-permeability oil deposit
The mass fraction choosing sodium humate respectively is 21%, 22%, 23%, the mass fraction of phenol is 1.5%, 2%,
2.5%, the mass fraction of formaldehyde is 2.5%, 3%, 3.5%, and pH value is 8,9,10, designs orthogonal experiment, sees
Table 1.
(1) the NaOH standard solution that concentration is 0.1mol/L is prepared.
(2) sodium humate 10.5g, phenol 0.75g, formaldehyde 1.25g, distilled water 37.5g are weighed respectively.
(3) the most successively the sodium humate weighed in (2), phenol, formaldehyde are added in the beaker filling distilled water
And be stirred until homogeneous with mechanical stirring device, under adition process needing guarantee that each step is carried out after being all stirred until homogeneous again
One step, each step is all advisable to stir, and mixing time is unsuitable long.
(4) with the pH value of mixed solution in NaOH standard solution regulation (3) that concentration is 0.1mol/L to 8,
Prepare No. 1 blocking agent solution.
(5) adjust blocking agent solution ratio and pH value, and repeat above-mentioned (2)-(4) step, prepare 2-9 respectively
Number blocking agent solution, finally gives 1-9 blocking agent solution, is shown in Table 2.
(6) will seal, 150 during in (5), 1-9 blocking agent solution is respectively charged into 9 groups of ampoule bottles and at bottle mouth position
Reacting and record gelation time under DEG C temperature conditions, test gelling strength after taking-up, experimental result is shown in Table 3.
With gelation time and gelling strength as evaluation index, the gel-forming property of overall merit 1-9 blocking agent solution, determine
The optimization formula of sodium humate blocking agent of the present invention is:
Polymer: sodium humate 23wt%, cross-linking agent: formaldehyde 3wt%, reinforcing agent: phenol 2.5wt%, remaining is
Distilled water, with the NaOH standard solution regulation pH value that concentration is 0.1mol/L to 10 (being shown in Table 4).
Table 1
Table 2
Table 3
Table 4
Test example 1: the preparation of optimization formula sodium humate blocking agent and gel-forming property evaluation thereof
(1) the NaOH standard solution that concentration is 0.1mol/L is prepared.
(2) sodium humate 11.00g, phenol 1.25g, formaldehyde 1.50g, distilled water 36.25g are weighed respectively.
(3) the most successively the sodium humate weighed in (2), phenol, formaldehyde are added in the beaker filling distilled water
And be stirred until homogeneous with mechanical stirring device, under adition process needing guarantee that each step is carried out after being all stirred until homogeneous again
One step, each step is all advisable to stir, and mixing time is unsuitable long.
(4) with the pH value of mixed solution in NaOH standard solution regulation (3) that concentration is 0.1mol/L to 10,
Prepare the resisting high temperature, high salt sodium humate pluralgel blocking agent solution of optimization formula.
(5) the blocking agent solution in (4) loaded in ampoule bottle and seal, under 150 DEG C of temperature conditionss at bottle mouth position
Carry out plastic reaction.
(6) measure gelation time: periodically taken out and horizontal positioned by ampoule bottle, observe gel upper surface and ampoule bottle
Bottom surface angulation, if more than 45 degree, judges gel formation and records gelation time, otherwise continues reaction the most periodically
Observe, until gel formation record gelation time.
(7) test gelling strength: initially with gel strong in GSC Strength Code method (being shown in Table 5) test (6)
Degree code, if more than G level, then uses breakthrough vacuum method to test its breakthrough pressure, i.e. plastic further further
Intensity, if below G level, the most only records its Strength Code.
(8) apparent viscosity of test gelled fluid (i.e. before plastic): by NDJ-7 rotary viscosity design determining gelled fluid
Apparent viscosity.
The gel pictorial diagram of optimization formula sodium humate blocking agent is shown in that Fig. 1, gelation time, gelling strength are shown in Table 6.
The apparent viscosity of optimization formula sodium humate blocking agent gelled fluid is l.4mPa s, and pumping into property is good, it is adaptable to hypotonic
The profile control and water plugging of oil reservoir thoroughly.
Table 5
Table 6
Test example 2: the heat resistance evaluation of optimization formula sodium humate blocking agent
(1) the NaOH standard solution that concentration is 0.1mol/L is prepared.
(2) sodium humate 11.00g, phenol 1.25g, formaldehyde 1.50g, distilled water 36.25g are weighed respectively.
(3) the most successively the sodium humate weighed in (2), phenol, formaldehyde are added in the beaker filling distilled water
And be stirred until homogeneous with mechanical stirring device, under adition process needing guarantee that each step is carried out after being all stirred until homogeneous again
One step, each step is all advisable to stir, and mixing time is unsuitable long.
(4) with the pH value of mixed solution in NaOH standard solution regulation (3) that concentration is 0.1mol/L to 10,
Prepare the resisting high temperature, high salt sodium humate pluralgel blocking agent solution of optimization formula.
(5) repeat the above steps (2)-(4), then prepare 3 groups of identical blocking agent solution, altogether 4 groups of optimization formulas
Blocking agent solution.
(6) 4 groups of blocking agent solution in (5) are respectively charged in 4 groups of ampoule bottles and seal, respectively 120 DEG C,
150 DEG C, 200 DEG C, react and record gelation time under the temperature conditions of 250 DEG C, test gelling strength after taking-up, real
Test and the results are shown in Table 7, Fig. 2.
According to experimental result, optimization formula sodium humate blocking agent gel-forming property within the temperature range of 120-200 DEG C is good,
Gelation time is controlled in 8-19h, and gelling strength is 0.062-0.095MPa, and resistance to elevated temperatures is good, and applicable for temperature
Degree wider range.
Table 7
Test example 3: the salt resistant character evaluation of optimization formula sodium humate blocking agent
(1) prepare salinity be respectively 0mg/L, 5000mg/L, 10000mg/L, 20000mg/L, 30000mg/L,
The each portion of NaCl aqueous solution of 50000mg/L, 80000mg/L, every part of 50g；Preparation salinity be respectively 0mg/L,
The CaCl of 5000mg/L, 10000mg/L, 20000mg/L, 30000mg/L, 50000mg/L2The each portion of aqueous solution,
Every part of 50g, altogether 13 groups of simulated formation water.
(2) distilled water in optimization formula is replaced, according to examination with 13 groups of simulated formation water of preparation in (1) respectively
Test the method in example 2, prepare 13 groups of blocking agent solution.
(3) 13 groups of blocking agent solution in (2) are respectively charged in 13 groups of ampoule bottles and seal, the temperature of 150 DEG C
Reacting and record gelation time under the conditions of degree, test gelling strength after taking-up, experimental result is shown in Table 8-9, Fig. 3-4.
According to experimental result, the optimization formula sodium humate blocking agent saline solution of resistance to monovalent metallic ion (in terms of NaCl)
Salinity reaches as high as 50000mg/L, and gelation time is at 11-14h, and gelling strength is 0.040-0.094MPa；Resistance to two
Valence metal ion saline solution is (with CaCl2Meter) salinity reach as high as 30000mg/L, gelation time at 8-14h,
Gelling strength is 0.030-0.094MPa.Optimization formula sodium humate blocking agent salt tolerant reach as high as 80000mg/L (with
50000mg/LNaCl and 30000mg/LCaCl2Meter), gelation time at 8-14h, gelling strength is
0.030-0.094MPa。
Optimization formula sodium humate blocking agent of the present invention still has good gel-forming property under the conditions of high salinity,
It is applicable to the profile control and water plugging operation of high salinity reservoirs reservoir.
Table 8
Table 9
Test example 4: the acid-proof alkaline evaluation of optimization formula sodium humate blocking agent
(1) the NaOH standard solution that concentration is 0.1mol/L is prepared.
(2) sodium humate 11.00g, phenol 1.25g, formaldehyde 1.50g, distilled water 36.25g are weighed respectively.
(3) the most successively the sodium humate weighed in (2), phenol, formaldehyde are added in the beaker filling distilled water
And be stirred until homogeneous with mechanical stirring device, under adition process needing guarantee that each step is carried out after being all stirred until homogeneous again
One step, each step is all advisable to stir, and mixing time is unsuitable long.
(4) repeat the above steps (2)-(3), then prepare 3 groups of mixed solutions, altogether 4 groups of mixed solutions.
(5) pH value of above-mentioned 4 groups of mixed solutions is regulated respectively with the NaOH standard solution that concentration is 0.1mol/L
To 8,9,10,11, prepare 4 groups of blocking agent solution.
(6) 4 groups of blocking agent solution in (5) are respectively charged in 4 groups of ampoule bottles and seal at bottle mouth position, at 150 DEG C
Temperature conditions under react and record gelation time, after taking-up test gelling strength, experimental result is shown in Table 10, Fig. 5.
According to experimental result, optimization formula sodium humate blocking agent gel-forming property when pH is 8-11 is good, gelation time
Controlled at 13-16h, gelling strength is 0.068-0.084MPa.Optimization formula sodium humate blocking agent of the present invention
Under weak basic condition, gelation time is longer and controlled, and gelling strength is big, and gel-forming property is good, it is adaptable to alkalescence oil
Hide the profile control and water plugging of reservoir.
Table 10
Claims (10)
1. the sodium humate blocking agent for high temperature and high salt low-permeability oil deposit, it is characterised in that this sodium humate blocking agent
Raw material including following mass percent forms: sodium humate 21-23%wt, formaldehyde 2.5-3.5%wt, phenol
1.5-2.5%wt, remaining is water.
Sodium humate blocking agent the most according to claim 1, it is characterised in that include the former of following mass percent
Material composition: sodium humate 21.5-22.5%wt, formaldehyde 2.5-3%wt, phenol 2-2.5%wt, remaining is water.
Sodium humate blocking agent the most according to claim 1, it is characterised in that include the former of following mass percent
Material composition: sodium humate 22%wt, formaldehyde 3%wt, phenol 2.5%wt, remaining is water.
Sodium humate blocking agent the most according to claim 3, it is characterised in that the apparent viscosity of blocking agent gelled fluid is
l.4mPa·s。
Sodium humate blocking agent the most according to claim 1, it is characterised in that the pH of described sodium humate blocking agent
For 8-10.
Sodium humate blocking agent the most according to claim 1, it is characterised in that described blocking agent is 120-200 in temperature
DEG C time, gelation time is at 8-19h, and gelling strength is 0.062-0.095MPa.
Sodium humate blocking agent the most according to claim 1, it is characterised in that described blocking agent is at 50000mg/LNaCl
And 30000mg/LCaCl2Mixing salt solution in, gelation time is at 8-14h, and gelling strength is 0.030-0.094MPa.
Sodium humate blocking agent the most according to claim 1, it is characterised in that described blocking agent is 8-11 at pH value
Time, gelation time is at 13-16h, and gelling strength is at 0.068-0.084MPa.
9. a preparation method for the sodium humate blocking agent described in any one of claim 1-8, comprises the following steps that
By the mass ratio of component each in formula, sodium humate, formalin, phenol are added to the water and are stirred until homogeneous,
The pH value of regulation mixed solution is 8-10, obtains the sodium humate blocking agent for high temperature and high salt low-permeability oil deposit.
Preparation method the most according to claim 9, it is characterised in that regulation mixed solution pH agents useful for same is
The NaOH standard solution of 0.1mol/L.
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| EP0786490A2 (en) * | 1996-01-26 | 1997-07-30 | Lignotech USA, Inc. | Production of acid soluble humates |
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Application publication date: 20160817 |