CN106634905A - Low-temperature salt-tolerant cross-linked polymer weak gel modifying and flooding agent preparation method - Google Patents
Low-temperature salt-tolerant cross-linked polymer weak gel modifying and flooding agent preparation method Download PDFInfo
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- CN106634905A CN106634905A CN201610813581.XA CN201610813581A CN106634905A CN 106634905 A CN106634905 A CN 106634905A CN 201610813581 A CN201610813581 A CN 201610813581A CN 106634905 A CN106634905 A CN 106634905A
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- salt
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- weak gel
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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
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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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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- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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Abstract
The invention discloses a low-temperature salt-tolerant cross-linked polymer weak gel modifying and flooding agent directly prepared from oilfield produced wastewater. The low-temperature salt-tolerant cross-linked polymer weak gel modifying and flooding agent is prepared from, by weight, 0.08-0.3 part of main agents, 0.1-5 parts of organic metal compound cross-linking agents, 0.1-2 parts of pH (potential of hydrogen) regulators and 100 parts of oilfield produced water. The main agents are anionic polyacrylamide with the molecular weight of 16-240 million. The oilfield produced wastewater is directly used for fluid preparation, fresh water is omitted, the water resource problem of regions in critical shortage of fresh water resources during oilfield construction fluid preparation is solved, gelling time can be controlled within 10-48 hours at the temperature of 25-50 DEG C, gel strength is high, salt-tolerant stability is good, and the weak gel modifying and flooding agent is convenient in on-site fluid preparation, environmentally friendly and suitable for modifying and flooding operation of various low-temperature oilfields.
Description
Technical field
The present invention relates to it is a kind of using oilfield produced waste water formulating low-temperature salt-resistant type cross-linked polymer Application of weak gel profile agent and
Its preparation method, belongs to water injection well in oil fields transfer drive technical field.
Background technology
Water flooding enters the middle and later periods, and common problem is Oil/gas Well water outlet, with the propulsion of waterside edge, layer
Between, in layer, the big contradiction of plane three, cause oil-field aqueous rapid increase, cause reservoir water flooding, oil recovery rate drop
It is low.Latter period of oilfield development high and stable yields are kept hence with effective profile control agent, is one of important measures of raising recovery ratio.It is anti-
Salt polymer forms high viscoelasticity flowable gel with organic metal multiple crosslinking agent, can effectively block macropore, reduces driving
For phase permeability, the injection pressure of low pressure well is improved, realize that profile control and displacing phase are combined, this not only can improve oil reservoir displacement
The viscosity of medium, further slows down the fingering during water drive is replaced and tonguing phenomenon, can also expand swept volume, improves displacement effect
Really, oil recovery rate is improved.
At present using more cross-linked gel mainly with partially hydrolyzed polyacrylamide (PHPA), modified polyacrylamide as thickening
Agent, reacts to form gelinite with crosslinking agent.But these polymer thickening agents not salt tolerant substantially, it is necessary to prepare base fluid with clear water,
The in great shortage area of freshwater resources, causes construction cost to increase.Additionally, the oil field extracted water of high salinity have it is compatible with stratum,
Clay swell can also be prevented, if with the extraction waste water base fluid after process, compared with clear water the guarantor to oil and gas reservoir is more beneficial to
Shield.
The content of the invention
The purpose of the present invention is to increase production for low temperature, waterflooding oil field transfer drive, water blockoff and propose a kind of directly using oily
Field produces waste water Application of weak gel profile agent technology, is shown by comprehensive performance evaluation, low temperature salt-resistant type cross-linked polymeric of the present invention
Thing Application of weak gel profile agent has initial viscosity low, and injection is good, and closing time is adjustable, and gel strength is high, is particularly well-suited to low temperature
The transfer drive of oil reservoir, water blockoff, solve the in great shortage regional oil field construction of freshwater resources with water resources problem during liquid, that is, save and produce into
This, but it is environmentally friendly.
Implementation process of the present invention is as follows：
A kind of low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent, its composition and weight portion are：
0.08～0.3 part of polymer；
0.1～5 part of crosslinking agent；
0.1～2 part of pH adjusting agent；
100 parts of oil field extracted water；
The polymer be PAMA, its molecular weight 16,000,000～240,000,000；
The crosslinking agent be organic metal multiple crosslinking agent, organic metal multiple crosslinking agent be soluble metallic salt, organic acid or
Its salt is with water according to weight than 2.5～8：3～7：80～90 mixing, adjust pH value 5～8.
The oil field extracted water is the water separated from the wet crude Jing dehydrations of subsurface reservoir extraction.
Described pH adjusting agent is selected from acetic acid, sodium acetate, citric acid, NaOH.
Described soluble metallic salt is aluminium chloride, Lvization Chrome and zirconium oxychloride, and its weight ratio is 2～7：0.2～2.5：
0.1～1.
Described organic acid or its salt is selected from citric acid, sodium citrate, tartaric acid, sodium potassium tartrate tetrahydrate, lactic acid, acetic acid, vinegar
Sour sodium.
Above-mentioned low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent is 25 DEG C～50 DEG C in temperature, and pH value is in 5～8 conditions
Under, it is the gel of tridimensional network.
The preparation method of above-mentioned low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent：It is 0.08～0.3 polymerization by weight
Thing, 0.1～5 part of organic metal multiple crosslinking agent, 0.1～2 part of pH adjusting agent is formed with 100 parts of oil field extracted water mixed preparings.
Specifically, the preparation method of above-mentioned profile control agent is that pH adjusting agent is added in oil field extracted water, stirring and dissolving
Afterwards, PAMA being added under agitation, continuing to stir 30 minutes, at room temperature aging 12h, is subsequently adding organic gold
Category multiple crosslinking agent, stirs, and the reaction at 25 DEG C～50 DEG C forms Weak Gels.
Present invention oilfield sewage（The stratum water of extraction）As the anti-salt type cross-linked gel system at water source, for oil field tune
Drive, water blockoff, both can effectively protect oil and gas reservoir, solve construction water and oil extraction-generated waste water emission problem, again can protecting ecology ring
Border, with very high economic benefit and social benefit.
Specific embodiment
Embodiment 1
The stratum water of Ordos Basin is taken from, 100 parts after oil removing, oil removal will be added under 0.15 part of stirring of polymer
In the stratum water of sulfate-sodium type, wherein salinity is 3.12 × 104Mg/L, after dissolving, aging 12h under room temperature adds 0.3
Part acetic acid, 0.5 part of sodium acetate is subsequently adding 0.6 part of organic metal multiple crosslinking agent, during 30 DEG C of water-bath is put into after stirring
Reaction, forms thick gel, as low temperature salt-resistant type cross-linked polymer weak gel profile after 25h.Organic metal multiple crosslinking agent is
Aluminium chloride, Lvization Chrome, zirconium oxychloride, citric acid and water compare 4 according to weight：0.5：0.1：6：90 prepare, with citric acid and carbonic acid
It is 6.5 that sodium adjusts pH value.
In order to detect present invention gel-forming property at different temperatures, the above-mentioned profile control agent base fluid for preparing is loaded into wide-mouth
In bottle, temperature is put into after sealing and is respectively 25 DEG C, 30 DEG C, 40 DEG C, 50 DEG C, constant temperature in 60 DEG C of water-bath so as to reacted, obtain five
Plant the Weak Gels under different temperatures.With 6NDJ-1 type rotary viscosity design determining gel viscosities, as a result as shown in table 1.
From table 1 it follows that as the rising of temperature, gelation time are shortened, gel strength is increased slightly, but temperature is big
After 60 DEG C, gel has dehydrating phenomena.Low temperature salt-resistant type cross-linked polymer Application of weak gel profile of the present invention agent is applied to 25
DEG C～50 DEG C of low-temperature reservoir.
Testing shear performance：
By the base fluid for preparing, in 170s-1Down cut 5 minutes, is then placed in constant temperature in 40 DEG C of water-baths, determine gelation time and
Gel viscosity.Test result indicate that, gelation time is 22h, and viscosity is 15600mPa.s.This is because shearing force makes polymer
Carbochain ruptures, and causes gelation time to extend, and gel viscosity is reduced, but still can meet the actual requirement of transfer drive.
The long-time stability of Weak Gels：
The long-time stability of Weak Gels are an important performances of profile control agent.The present invention is tested using calcium chloride water type（Extraction
Water）, according to the Weak Gels that above-mentioned preparation method is formed at 40 DEG C, in putting it into ageing can, in 40 DEG C of insulating boxs, periodically
Determine viscosity.Measurement result is shown in Table 2.
From table 2 it can be seen that the Application of weak gel profile agent of the present invention is after 5 months, gel viscosity still has initial viscosity
71%, show with preferable long-time stability.
Embodiment 2
The stratum water of Ordos Basin is taken from, 100 parts after oil removing, oil removal will be added under 0.10 part of stirring of polymer
In the stratum water of sodium bicarbonate water type, wherein salinity is 1.93 × 104Mg/L, after dissolving, aging 12h under room temperature is added
0.5 part of acetic acid, 0.4 part of sodium acetate is subsequently adding 0.5 part of organic metal multiple crosslinking agent, and 40 DEG C of water is put into after stirring
React in bath, thick gel, as low temperature salt-resistant type cross-linked polymer weak gel profile are formed after 19h.Organic metal composite crosslinking
Agent compares 5 for aluminium chloride, Lvization Chrome, zirconium oxychloride, citric acid and water according to weight：0.3：0.5：4：80 prepare, with citric acid and
It is 6.5 that sodium carbonate adjusts pH value.
Embodiment 3
The stratum water of Ordos Basin is taken from, 100 parts after oil removing, oil removal will be added under 0.20 part of stirring of polymer
In the stratum water of calcium chloride water type, wherein salinity is 5.64 × 104Mg/L, after dissolving, aging 12h under room temperature adds 0.3
Part acetic acid, 0.5 part of sodium acetate is subsequently adding 1.0 parts of organic metal multiple crosslinking agents, during 40 DEG C of water-bath is put into after stirring
Reaction, forms thick gel, as low temperature salt-resistant type cross-linked polymer weak gel profile after 20h.Organic metal multiple crosslinking agent is
Aluminium chloride, Lvization Chrome, zirconium oxychloride, citric acid and water compare 5 according to weight：1.5：0.2：4：80 prepare, with citric acid and carbonic acid
It is 6.5 that sodium adjusts pH value.
Claims (7)
1. a kind of low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent, its composition and weight portion are：
0.08～0.3 part of polymer；
0.1～5 part of crosslinking agent；
0.1～2 part of pH adjusting agent；
100 parts of oil field extracted water；
The polymer be PAMA, its molecular weight 16,000,000～240,000,000；
The crosslinking agent be organic metal multiple crosslinking agent, organic metal multiple crosslinking agent be soluble metallic salt, organic acid or
Its salt is with water according to weight than 2.5～8：3～7：80～90 mixing, adjust pH value 5～8.
2. the low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent according to claims 1, it is characterised in that：The oil
Field recovered water is the water separated from the wet crude Jing dehydrations of subsurface reservoir extraction.
3. the low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent according to claims 1, it is characterised in that：Described
PH adjusting agent is selected from acetic acid, sodium acetate, citric acid, NaOH.
4. the low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent according to claims 1, it is characterised in that：Described
Soluble metallic salt is aluminium chloride, Lvization Chrome and zirconium oxychloride, and its weight ratio is 2～7：0.2～2.5：0.1～1.
5. the low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent according to claims 1, it is characterised in that：Described
Organic acid or its salt are selected from citric acid, sodium citrate, tartaric acid, sodium potassium tartrate tetrahydrate, lactic acid, acetic acid, sodium acetate.
6. according to claims 1 to 5 one of arbitrarily described in low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent, its feature
It is：The low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent temperature be 25 DEG C～50 DEG C, pH value under the conditions of 5～8,
For the gel of tridimensional network.
7. the preparation method of low temperature salt-resistant type cross-linked polymer Application of weak gel profile agent described in claims 1, it is characterised in that：Will
Weight is 0.08～0.3 polymer, 0.1～5 part of organic metal multiple crosslinking agent, 0.1～2 part of pH adjusting agent and 100 parts of oil fields
Recovered water mixed preparing is formed.
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| CN201610813581.XA CN106634905A (en) | 2016-09-12 | 2016-09-12 | Low-temperature salt-tolerant cross-linked polymer weak gel modifying and flooding agent preparation method |
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| CN201610813581.XA CN106634905A (en) | 2016-09-12 | 2016-09-12 | Low-temperature salt-tolerant cross-linked polymer weak gel modifying and flooding agent preparation method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109439306A (en) * | 2018-12-24 | 2019-03-08 | 陕西明德石油科技有限公司 | Extra permeability oilfield selectivity Application of weak gel profile agent |
| CN109575901A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | Nontoxic high-temperature oil reservoir deep polymer weak gel transfer drive system and preparation method thereof |
| CN109779564A (en) * | 2017-11-13 | 2019-05-21 | 中国石油天然气股份有限公司 | Use method of self-generated gel for water shutoff profile control and flooding |
| CN110885670A (en) * | 2018-09-11 | 2020-03-17 | 任丘市油联化工有限公司 | Low-temperature crosslinking delaying formula |
| CN111518530A (en) * | 2020-04-07 | 2020-08-11 | 大庆油田有限责任公司 | Organic zirconium cross-linked gel plugging modifier for water-flooding well treatment and preparation method thereof |
| CN115746809A (en) * | 2022-11-18 | 2023-03-07 | 中海石油(中国)有限公司 | Lignin reinforced emulsion polymer gel profile control and flooding agent for ultrahigh-temperature high-salinity oil reservoir |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109575901A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | Nontoxic high-temperature oil reservoir deep polymer weak gel transfer drive system and preparation method thereof |
| CN109779564A (en) * | 2017-11-13 | 2019-05-21 | 中国石油天然气股份有限公司 | Use method of self-generated gel for water shutoff profile control and flooding |
| CN109779564B (en) * | 2017-11-13 | 2022-03-29 | 中国石油天然气股份有限公司 | Use method of self-generated gel for water shutoff profile control and flooding |
| CN110885670A (en) * | 2018-09-11 | 2020-03-17 | 任丘市油联化工有限公司 | Low-temperature crosslinking delaying formula |
| CN109439306A (en) * | 2018-12-24 | 2019-03-08 | 陕西明德石油科技有限公司 | Extra permeability oilfield selectivity Application of weak gel profile agent |
| CN111518530A (en) * | 2020-04-07 | 2020-08-11 | 大庆油田有限责任公司 | Organic zirconium cross-linked gel plugging modifier for water-flooding well treatment and preparation method thereof |
| CN111518530B (en) * | 2020-04-07 | 2022-08-19 | 大庆油田有限责任公司 | Organic zirconium cross-linked gel plugging modifier for water-flooding well treatment and preparation method thereof |
| CN115746809A (en) * | 2022-11-18 | 2023-03-07 | 中海石油(中国)有限公司 | Lignin reinforced emulsion polymer gel profile control and flooding agent for ultrahigh-temperature high-salinity oil reservoir |
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