CN109233771A - A kind of dedicated diverting agent of low pressure well and preparation method thereof - Google Patents
A kind of dedicated diverting agent of low pressure well and preparation method thereof Download PDFInfo
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- CN109233771A CN109233771A CN201811220961.8A CN201811220961A CN109233771A CN 109233771 A CN109233771 A CN 109233771A CN 201811220961 A CN201811220961 A CN 201811220961A CN 109233771 A CN109233771 A CN 109233771A
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- low pressure
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- diverting agent
- pressure well
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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
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
Abstract
The invention belongs to diverting agent technical fields, and in particular to a kind of dedicated diverting agent of low pressure well and preparation method thereof.The kill-job faced for existing low pressure oil/gas well is unstable, kill-job is missed and the defect of existing conventional measure, in conjunction with the requirement of modern well control, it is required according to environment protection emission, and according to the big principle of present oilfield exploitation cost efficiency, the technical scheme is that being made after hybrid reaction, drying and crushing of raw material, the raw material includes natural plant gum, organic monomer, sulfonating agent and small cation.Solve the problems, such as low pressure oil/gas well existing kill-job unstability, fluid volume during workover treatment big, pollution payzone and the activity duration it is long, after expect that produce the time long, efficiently, stable and fluid volume it is few.The present invention provides strong technical guarantee for current low pressure oil/gas well and the exploitation of unconventional gas well, belongs to the low investment of one kind, fanout free region, the apparent functional environment-friendly product system of effect.
Description
Technical field
The invention belongs to diverting agent technical fields, and in particular to a kind of dedicated diverting agent of low pressure well and preparation method thereof.
Background technique
Current most of oil gas fields have entered mid-later development phase, due to shorting or debilitating exploitation, the stratum of main payzone
Barometric gradient has been significantly less than original formation pressure gradient, in some instances it may even be possible to be lower than water column pressure, especially gas well, cannot fill the water
In the case where exploitation, the later period persistently exploited necessarily causes strata pressure in debt.In this case, such as oil/gas well is carried out
Complete well and workover treatment certainly will occur a large amount of leakages and blocking of the solid phase to payzone of completion fluid and workover fluid, make in operation
Oil gas well capacity is greatly reduced after obtaining operation.It is more seriously, since circulation cannot be established so that part well can not achieve
Well workover, so that oil/gas well prematurely scraps (especially gas well).If at high cost since duty cycle is long using fishing sand operation,
Formation damage is serious, restores the reasons such as production capacity time delay, causes operational benefit low, cannot realize workover treatment well
Purpose greatly reduces the development benefit of oil gas field.For having the oil gas of the multi pressure series of strata of normal pressure layer and low pressure layer simultaneously
Well operations difficulty is just bigger.
In order to solve the problems, such as that low pressure well kill-job is missed, oil field operation person it is also proposed that and apply different technical solutions,
Such as high viscous xanthan gum well killing fluid, solvable blocking agent well killing fluid, low density foam well killing fluid and snubbing serving, these measures are answered
With the serious problem of missing can be alleviated to a certain extent, but problem there is also many constructions and is reproduced by application, such as
No matter the viscous xanthan gum Killing Fluid System of height is being prepared or pumping both increases many workloads, especially since viscosity is excessively high
High viscose enter behind stratum be difficult to it is counter arrange, it is difficult to restore production capacity, attends to one thing and lose sight of another；Solvable blocking agent well killing fluid dosage is big, and serious
It is influenced by formation porosity, construction success rate is low, while blocking agent also needs to bring in by high-viscous liquid, and there is also the rows of returning
Hardly possible influences the problem of later period production capacity；The higher cost of low density foam Killing Fluid System, complex process and dedicated set need to be used
Standby, stable period is short, and environmental pollution is big, and for multiple pressure Force system well, is not able to satisfy since itself density is single
The technical requirements that multilayer system constructs simultaneously, exactly for most wells, multilayer system is often simultaneous；And no killing well is made
Industry to a certain extent can be to avoid above-mentioned various technological deficiencies, but construction risk is big, needs to introduce or rent well head dress
Standby, some workover treatments are not suitable for snubbing serving and expense is relatively high, duty cycle is long.
Summary of the invention
The kill-job faced for existing low pressure oil/gas well is unstable, kill-job is missed and the defect of existing conventional measure, in conjunction with existing
For well control requirement, required according to environment protection emission, and according to the big principle of present oilfield exploitation cost efficiency, the present invention provides one kind
The dedicated diverting agent of low pressure well, its object is to: solve low pressure oil/gas well well workover, fishing sand operation in due to well killing fluid leakage without
The problem of energy normal operation；The fluid volume as caused by the leakage of well killing fluid is big, increases operating expenses indirectly, and a large amount of
After well killing fluid leakage enters stratum, reservoir is caused serious injury, and very big problem is influenced on reproducing for operation.
The technical solution adopted by the invention is as follows:
A kind of dedicated diverting agent of low pressure well is made after hybrid reaction, drying and crushing of raw material, and the raw material includes
Natural plant gum, organic monomer, sulfonating agent and small cation.
Preferably, natural plant gum is one of cellulose, xanthan gum, starch and sesbania powder or a variety of combinations.
Preferably, organic monomer is acrylonitrile or acrylic acid.
Preferably, sulfonating agent be one of sulfonic acid, alkyl sulfonic acid and 2- acrylamido -2- methyl propane sulfonic acid sodium or
A variety of combinations.
Preferably, small cation is one of ammonium salt type, quaternary and heterocyclic type organic cation or a variety of groups
It closes.
Preferably, the proportion of raw material is chosen according to following parts by weight:
40~70 parts of natural plant gum；
10~28 parts of organic monomer；
5~15 parts of sulfonating agent；
3~8 parts of small cation.
The present invention also provides the preparation methods of the dedicated diverting agent of above-mentioned low pressure well, include the following steps:
[1] natural plant gum is mixed in proportion with water, diluted acid acidolysis is added；
[2] organic monomer and catalyst, heating are added into the natural plant gum dispersion liquid after the acidolysis that step [1] is handled
Reaction；
[3] the natural plant gum dispersion liquid after step [2] are reacted is adjusted pH value is 7-8；
[4] to by step [3] processing natural plant gum dispersion liquid heat, then be added sulfonating agent, small cation and
Initiator, insulation reaction；
[5] product will be obtained after reaction solution cooling, drying and crushing that step [4] is reacted.
Preferably, a kind of oxidation of the oxide or multiple element of element in catalyst Mn, Cr, Ni, Co, Fe, Ti or V
The combination of object.
Preferably, initiator is per-compound.
After adopting the above technical scheme, cardinal principle of the invention is:
1. selecting degradation material natural plant gum, carrying out weak crosslinking with organic monomer under catalytic condition can to generate one kind
The undissolved cross-linking type linear polymeric electrolyte intermediate with swelling, among the cross-linking type linear polymeric electrolyte
Body itself contains a large amount of hydroxyl and hydrophilic radical, and the water for being allowed to be easier to dissociate is formed together with Hydrogenbond, thus to water
Form a kind of constraint；Separately due to the electrolyte of itself, can be electrolysed in water after being dissolved in water, the electrolytic ion of generation is mutual
Effect so that product swelling on the one hand due to interiors of products ion concentration increase, so that water is traveled further into interiors of products, it is another
Aspect again limits the water suction of product due to the cross-linked structure and Hydrogenbond of product itself, passes through strict control catalyst and original
The concentration and proportion of material, generate the moderate state of constraint outlet capacity, and excessively high colloid can frangible, nonelastic, poor, the mistake that fetters outlet capacity
Low then effect decline, dosage are big, uneconomical；
2. well killing fluid needs good heat and salinity tolerance performance as a kind of entry well fluid, sulfonic acid group is anti-for a temperature resistance
The more stable active reactive group of salt can be used two ways and be introduced into polymerization, one kind for by sulfonating agent directly or
It is added indirectly and carries out sulfonic group or sulfoalkylation, such mode is easy to operate and cost is relatively low, but is often not easily controlled
Sulfonation degree and by-product is more；Another way is using containing sulfonic monomer and other activated monomers progress binary or polynary total
Poly- reaction, to introduce sulfonic group in polymer, the approach advantage is it is obvious that be exactly sulfonation group and other types of functional groups
Ratio and the sulfonation degree of product be easier to control, product sulfonation degree is easily obtained than more uniform, and without sulfonation byproduct
Meet the product of designed molecular structure；In copolymerization, we are ensured that by the way of second of introducing sulfonic acid group
The controllability of product structure；
3. subsurface reservoir is made of various clay minerals, when encountering outside fluid especially water phase if can occur it is swollen
Swollen, dispersion and migration, cause payzone to injure, so product needs to have enough stratum inhibition and stabilizing power, cation poly-
The multiple spot cation group that conjunction object can use itself is adsorbed in the surface of clay mineral, reduces or shield outside fluid and clay
The contact of mineral, to inhibit the generation of injury, so introducing the substitution of cation, in the polymeric modification of product with enhancing
Inhibition control ability of the product to stratum；
4. what the realization of temporary plugging function relied on is the matching of product itself different-grain diameter, product machinability it requires
By force, while according to specific payzone porosity and larynx diameter, product ultimate size size is determined.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
1. the dedicated diverting agent of low pressure well is prepared easy, usage amount is small, can save with liquid manually and liquid preparation time, drop indirectly
Low construction cost；
2. the dedicated diverting agent stability of low pressure well is good, it is long that the well killing fluid after preparation stablizes the time, even if vacation after row is returned in operation
It such as may continue to be recycled without solid phase pollution, greatly reduce liquid expense；
3. well killing fluid after the row of returning can natural degradation, any adverse effect will not be caused to environment, if adding degradation speed
Fastly, certain gel breaker can artificially be added, then it can be degradable with 3-5 days at normal temperature.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is 1 core damage empirical curve of the embodiment of the present invention.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Embodiment 1
Natural plant gum and water are stirred evenly in the ratio of 1:3 in the reaction kettle of controllable temperature, it is 5~8% that 5% concentration, which is added,
Dilute hydrochloric acid acidolysis one hour at normal temperature, be then added with stirring 80kg acrylic acid and 2kg catalyst, the catalyst is
Cr2O3, 3~5Kg of sodium carbonate, 40% 12~20Kg of sodium hydroxide solution are added under stirring, adjustment solution ph is 7-8, liter
Sulfonating agent 40Kg, small cation 15Kg is added to 45 DEG C in temperature under stirring, be stirring evenly and then adding into initiator 8Kg, and heat preservation is anti-
Moisture control is pressed specified particle size crushing packing using vacuum drying by cooling discharge after answering 2 hours below 8%.
In above-mentioned technique, natural plant gum is cellulose, and sulfonating agent is sulfonic acid, and small cation is chlorination 12 to cetyl two
Methylbenzyl ammonium, initiator are the hydrogen peroxide of mass fraction 30%.
Embodiment 2
Natural plant gum and water are stirred evenly in the ratio of 1:4 in the reaction kettle of controllable temperature, it is 5~8% that 5% concentration, which is added,
Dilute hydrochloric acid acidolysis one hour at normal temperature, be then added with stirring 110kg acrylic acid and 3kg catalyst, the catalyst is
MnO2, 3~5Kg of sodium carbonate, 40% 12~20Kg of sodium hydroxide solution are added under stirring, adjustment solution ph is 7-8, liter
Temperature is added sulfonating agent 55Kg, small cation 20Kg, is stirring evenly and then adding into initiator 10Kg to 45 DEG C under stirring, keep the temperature
Moisture control is pressed specified particle size crushing packing using vacuum drying by cooling discharge after reaction 2 hours below 8%.
In above-mentioned technique, natural plant gum is xanthan gum, and sulfonating agent is ethylsulfonic acid, and small cation is chlorination 12 to hexadecane
Base dimethyl benzyl ammonium, initiator are the hydrogen peroxide of mass fraction 30%.
Embodiment 3
Natural plant gum and water are stirred evenly in the ratio of 1:5 in the reaction kettle of controllable temperature, it is 5~8% that 5% concentration, which is added,
Dilute hydrochloric acid acidolysis one hour at normal temperature, be then added with stirring 140kg acrylic acid and 3kg catalyst, the catalyst is
Co2O3, 3~5Kg of sodium carbonate, 40% 12~20Kg of sodium hydroxide solution are added under stirring, adjustment solution ph is 7-8, liter
Temperature is added sulfonating agent 70Kg, small cation 24Kg, is stirring evenly and then adding into initiator 12Kg to 45 DEG C under stirring, keep the temperature
Moisture control is pressed specified particle size crushing packing using vacuum drying by cooling discharge after reaction 2 hours below 8%.
In above-mentioned technique, natural plant gum is sesbania powder, and sulfonating agent is 2- acrylamido -2- methyl propane sulfonic acid sodium, small sun
Ion is chlorination 12 to cetyldimethylbenzylammonium, and initiator is the hydrogen peroxide of mass fraction 30%.
Low pressure well well killing fluid group becomes point of the dedicated diverting agent of 1~1.2% low pressure well of mass percent configured with clear water
Dispersion liquid.In conjunction with Oil Field requirement, the low pressure well prepared to the dedicated diverting agent of low pressure well made of embodiment 1 to embodiment 3 is special
Following Lab-evaluation is done from the angle of application with well killing fluid:
One, basic index detects:
| Formula | Density g/cm3 | Viscosity mPa.s | Dehydration ml |
| Embodiment 1 | 1.01 | 50 | 17.6 |
| Embodiment 2 | 1.01 | 42 | 18.3 |
| Embodiment 3 | 1.01 | 40 | 19.0 |
Two, gel breaking test:
| Serial number | Density g/cm3 | Well killing fluid mPa.s | Broken glue mPa.s |
| Embodiment 1 | 1.01 | 50 | 4 |
| Embodiment 2 | 1.01 | 42 | 3 |
| Embodiment 3 | 1.01 | 40 | 3 |
Three, 1 stability experiment of embodiment:
| Standing time (day) | Density g/cm3 | Viscosity mPa.s |
| 0 | 1.01 | 50 |
| 5 | 1.01 | 51 |
| 10 | 1.01 | 55 |
| 25 | 1.01 | 52.5 |
| 30 | 1.01 | 47.5 |
Four, anti-dilative is tested:
| Formula | Core height (mm) | 16h expansion height (mm) | 16h expansion rate (%) |
| Clear water | 11.66 | 3.04 | 26.07 |
| Well killing fluid | 12.49 | 0.69 | 5.52 |
| Well killing fluid | 12.39 | 0.63 | 5.08 |
Five, 1 core damage of embodiment is tested:
Fig. 1 is empirical curve, and the well killing fluid is extremely low to core damage, and permeability resume figure can be up to 95% or more, especially
It is more prominent for low permeability reservoirs protection reservoir performance.
The specific embodiment of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to the application protection scope therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, under the premise of not departing from technical scheme design, various modifications and improvements can be made, these belong to this
The protection scope of application.
Claims (9)
1. a kind of dedicated diverting agent of low pressure well, it is characterised in that: be made after hybrid reaction, drying and crushing of raw material, institute
Stating raw material includes natural plant gum, organic monomer, sulfonating agent and small cation.
2. the dedicated diverting agent of a kind of low pressure well described in accordance with the claim 1, it is characterised in that: the natural plant gum be cellulose,
One of xanthan gum, starch and sesbania powder or a variety of combinations.
3. the dedicated diverting agent of a kind of low pressure well described in accordance with the claim 1, it is characterised in that: the organic monomer is acrylonitrile
Or acrylic acid.
4. the dedicated diverting agent of a kind of low pressure well described in accordance with the claim 1, it is characterised in that: the sulfonating agent is sulfonic acid, alkane
One of base sulfonic acid and 2- acrylamido -2- methyl propane sulfonic acid sodium or a variety of combinations.
5. the dedicated diverting agent of a kind of low pressure well described in accordance with the claim 1, it is characterised in that: the small cation is ammonium salt
One of type, quaternary and heterocyclic type organic cation or a variety of combinations.
6. according to a kind of dedicated diverting agent of low pressure well described in any one of claim 1 to 5, which is characterized in that the raw material
Proportion is chosen according to following parts by weight:
40~70 parts of natural plant gum；
10~28 parts of organic monomer；
5~15 parts of sulfonating agent；
3~8 parts of small cation.
7. a kind of a kind of preparation method of the dedicated diverting agent of low pressure well described in accordance with the claim 1, which is characterized in that including such as
Lower step:
[1] natural plant gum is mixed in proportion with water, diluted acid acidolysis is added；
[2] organic monomer and catalyst are added into the natural plant gum dispersion liquid after the acidolysis that step [1] is handled, heating is anti-
It answers；
[3] the natural plant gum dispersion liquid after step [2] are reacted is adjusted pH value is 7-8；
[4] the natural plant gum dispersion liquid by step [3] processing is heated, sulfonating agent, small cation and initiation is then added
Agent, insulation reaction；
[5] product will be obtained after reaction solution cooling, drying and crushing that step [4] is reacted.
8. a kind of preparation method of the dedicated diverting agent of low pressure well according to claim 7, it is characterised in that: the catalyst
For the combination of the oxide of the oxide or multiple element of element a kind of in Mn, Cr, Ni, Co, Fe, Ti or V.
9. a kind of preparation method of the dedicated diverting agent of low pressure well according to claim 7, it is characterised in that: the initiator
For per-compound.
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| CN201811220961.8A CN109233771A (en) | 2018-10-19 | 2018-10-19 | A kind of dedicated diverting agent of low pressure well and preparation method thereof |
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Cited By (2)
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| CN111826136A (en) * | 2019-04-19 | 2020-10-27 | 中国石油天然气股份有限公司 | Drilling fluid and preparation method thereof |
| CN114539997A (en) * | 2022-02-24 | 2022-05-27 | 大庆汇联技术开发有限公司 | Low-cost, clean and solid-free gel for killing well and preparation method thereof |
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| CN114539997A (en) * | 2022-02-24 | 2022-05-27 | 大庆汇联技术开发有限公司 | Low-cost, clean and solid-free gel for killing well and preparation method thereof |
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