CN109810687A - A kind of environment-friendly type acidification working solution suitable for the volume increase of hypotonic coalbed methane reservoir - Google Patents
A kind of environment-friendly type acidification working solution suitable for the volume increase of hypotonic coalbed methane reservoir Download PDFInfo
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Abstract
The present invention provides a kind of environment-friendly types suitable for the volume increase of hypotonic coalbed methane reservoir to be acidified working solution, belongs to cbm development technical field.Environment-friendly type acidification working solution of the invention is made of organic acid, chelating agent, expansion-resisting agent and corrosion inhibiter etc., includes each component of following mass parts in every 100 parts of water: 7-9 parts of organic acid, 4-5 parts of chelating agent, 4 parts of expansion-resisting agent, 0.5-1 parts of corrosion inhibiter；Organic acid is made of formic acid and citric acid, and chelating agent is made of glutamic acid N, N- oxalic acid (GLDA) and N- beta-hydroxy ethyl-3-acetic acid ethylenediamine (HEDTA) composition, expansion-resisting agent potassium chloride and ammonium chloride.Environment-friendly type acidification working solution of the invention has preferable corrosion effect to the crystalline mineral in coal petrography, coal petrography fracture width, porosity can be made to increase, and then increase gas permeability；It is low to the corrosivity of tubing simultaneously, will not pollute to coal mine underground water, will not influence the coal product quality of later period production, has a good application prospect in the volume increase of hypotonic coalbed methane reservoir.
Description
Technical field
The present invention relates to cbm development technical field more particularly to a kind of rings suitable for the volume increase of hypotonic coalbed methane reservoir
Guarantor's type is acidified working solution.
Background technique
Coal bed gas is a kind of highly important Unconventional gas, is adsorbed on matrix of coal particle surface or in the form of free state
It is present in the hole crack of coal petrography, is the associated minerals resource of coal.Although China has coal bed gas resource very rich,
Due to its lower permeability (generally in 0.001-0.1mD), the development and utilization of coal bed gas is constrained.
Although widely used hydraulic fracturing technology can be linked up effectively in coal petrography in hypotonic coal-bed-gas production-increase at present
Hugger and structural fracture, but due to coal petrography have stronger stress sensitivity, crack can be closed under high pressure, influence coal bed gas
The production gas effect of desorption and final coal bed gas well, and high pressure is easy to link up the water-bearing layer in coal seam and roof and floor.
On the other hand, Acidizing Technology is one of the important means of high oil and gas production in oil-gas field development, is to pass through wellbore
One or more of acid solutions are injected to stratum, it, can after tamper in acid solution corrosion coal petrography cement or formation pore, crack
Restore or improve stratum permeability.In traditional Acidizing Technology conventional acid solution such as hydrochloric acid or mud acid exist to well pipe corrosion compared with
By force, it is easy to generate the problem of sediments such as calcirm-fluoride and silica gel cause secondary injury.Therefore, in hypotonic coal bed gas well stimulation work
There is an urgent need to a kind of novel acidified technologies for adapting to its reservoir properties.
Chinese invention patent " a kind of chemical formulation for the souring soln for improving coal seam permeability " (publication number:
A kind of chemical formulation of souring soln for improving coal seam permeability 106497540A) is provided, by following component percentage by weight
Than composition: hydrochloric acid 12-15%, hydrofluoric acid 2-2.5%, acidification retardant 2.5-3%, acidification corrosion inhibitor 1.5-1.8%, iron ion
Stabilizer 0.3-0.5, expansion-resisting agent 2-2.2%, surplus are water.The invention is mainly for for calcite contained in coal seam, white
The mineralogical compositions such as marble, silicate after these mineralogical compositions are acidified solution dissolution, flow out from coal seam with souring soln, increase
The connectivity in crack and crack in coal seam to increase the permeability in coal seam improves the extracting result of coal bed gas.But by
Main component is hydrochloric acid and hydrofluoric acid in its formula, and in acidization, hydrochloric acid is also easy to produce the migration for causing illite minerals,
Hydrofluoric acid is easy production calcium fluoride precipitate, while two kinds of acid solutions are more strong to bottomhole corrosion.
Chinese invention patent " for releasing the acidification blocking remover of coal bed gas well contamination and plugging " (publication number: 104073230A)
Provide it is a kind of for releasing the acidification blocking remover of coal bed gas well contamination and plugging, by weight percentage, including 3.0-5.0% ammonia
Base sulfonic acid, 3.0-5.0% ammonium acid fluoride, 0-2.0% acetic acid, 1.0-2.0% formaldehyde, 0.5-1.0% acetylenediol, 0.5-
1.0% ammonium chloride, remaining is water.The invention has solution ration strong, and the low feature of corrosion rate utilizes acetic acid, sulfamic acid
Silicate mineral and the carbonate mineral etc. in hydrofluoric acid corrosion coal seam are slowly generated with ammonium acid fluoride.But contain in its de-plugging agent
There is fluoride, residual acid harm is high, exists to environment and pollutes.
Chinese invention patent " a kind of de-plugging agent and acidification method for removing blockage suitable for complex lithology reservoir acidification " is (open
Number: a kind of de-plugging agent suitable for complex lithology reservoir acidification 103484088B) is disclosed, by the raw material of following weight percent
It is mixed: hydrazine hydrochloride 10-25%, fluorochemical 2-6%, acidification corrosion inhibitor 0.3-3%, demulsification cleanup agent 0.3-3%, acid
Change and use ferrous stability 0.3-3%, clay stabilizer 0.3-3%, surplus is water.De-plugging agent uses powdered hydrazine hydrochloride and contains
Hydrofluoric acid is slowly generated in reservoir after fluorine compounds mixing and carries out de-plugging, and there is raw material convenient transportation, use safety and environmental protection
Feature: generating hydrofluoric acid by hydrazine hydrochloride and fluorochemical in the earth formation, achievees the purpose that slow, is improving reservoir permeability
Regular mud acid is substantially better than in terms of penetration depth.De-plugging is at low cost, and penetration depth is big, can be good at controlling acid-rock reaction speed
Degree improves acidification de-plugging efficiency, while reducing corrosion of the acid solution to metal pipe line and equipment, prevents formation contaminant.Existing for it
Being disadvantageous in that in its formula joined a large amount of hydrazine hydrochloride and fluorochemical, and to coal mine underground water, there are potential prestige
The side of body.
Hydrochloric acid, hydrofluoric acid or mud acid etc. are directly used in hypotonic coalbed methane reservoir volume increase, can bring serious well pipe corrosion
Problem also has a degree of adverse effect to coal mine underground water water quality.
Summary of the invention
In view of this, the present invention provides a kind of environment-friendly types that can be suitable for the volume increase of hypotonic coalbed methane reservoir to be acidified work
Liquid has preferable corrosion effect to the mineral in coal seam, has the effect of preferably increasing Permeability Oe Coal And Porous Rock And Fractured Rock and porosity, to well
Lower tubing corrosivity is low, has the good feature of environmental protection.
The present invention provides it is a kind of suitable for hypotonic coalbed methane reservoir volume increase acidification working solution, by organic acid, chelating agent,
Expansion-resisting agent, corrosion inhibiter and water composition, contain each component of following mass parts in every 100 parts of water: 7-9 parts of organic acid, chelating agent 4-5
Part, 4 parts of expansion-resisting agent, 0.5-1 parts of corrosion inhibiter.
Further, the organic acid is made of 3-5 parts of formic acid and 3-5 parts of citric acids, and the chelating agent is by 3-5 parts of paddy ammonia
Sour N, N- oxalic acid (GLDA) and 1-2 parts of N- beta-hydroxy ethyl-3-acetic acid ethylenediamine (HEDTA) compositions, the expansion-resisting agent is by 1-3
Part potassium chloride and 1-3 parts of ammonium chlorides compositions, the corrosion inhibiter are water-soluble imidazoline.
Compared with prior art, technical solution provided by the invention has the benefit that
(1) environment-friendly type in the present invention is acidified Working solution prescription not hydrofluoric acid containing or hydrochloric acid, will not make to coal mine underground water
At pollution, the quality of later period production coal product will not be influenced, it is low to the corrosivity of downhole tubular goods；
(2) organic acid is made of formic acid and citric acid in the environment-friendly type acidification Working solution prescription in the present invention, they have
Preferable slow speed effect does not easily cause the particle migration in coal petrography；
(3) chelating agent HEDTA, GLDA can be golden with calcium, iron, magnesium etc. in the environment-friendly type acidification Working solution prescription in the present invention
Belong to cation and form stable, soluble chelate, while cooperateing with enhancing to the corrosion energy of crystalline mineral in coal petrography etc. with organic acid
Power, and mitigate corrosion of the acid solution to down-hole equipment etc..
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention.
Fig. 1 is that the village Shan Xicheng area 3# coal petrography without environment-friendly type of the invention chelates acid soak in the embodiment of the present invention
Scanning electron microscope (SEM) photograph；
Fig. 2 is scanning of the village the Shan Xicheng area 3# coal petrography by environment-friendly type of the present invention chelating acid soak in the embodiment of the present invention
Electron microscope；
Fig. 3 is the change in pressure drop curve in the embodiment of the present invention in the 3# coal petrography of the village Shan Xicheng during displacement hydrochloric acid；
Fig. 4 is the environment-friendly type acidification working solution mistake of the displacement embodiment 1 in the 3# coal petrography of the village Shan Xicheng in the embodiment of the present invention
Change in pressure drop curve in journey.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is further described.
Formic acid in the embodiment of the present invention is Sinopharm Chemical Reagent Co., Ltd.'s production, mass concentration 88%；Lemon
Lemon acid is Sinopharm Chemical Reagent Co., Ltd.'s production, and glutamic acid N, N- oxalic acid (GLDA) is the light limited public affairs of Ninghua work in Shanghai
Department's production, N- beta-hydroxy ethyl-3-acetic acid ethylenediamine (HEDTA) are the production of Shanghai Han Si Chemical Co., Ltd., and potassium chloride is traditional Chinese medicines
The production of chemical reagent Co., Ltd, group, ammonium chloride are Sinopharm Chemical Reagent Co., Ltd.'s production, and water-soluble imidazoline is
The production of Shandong You Suo Chemical Industry Science Co., Ltd.
Embodiment 1
The embodiment of the present invention 1 environment-friendly type acidification working solution the preparation method is as follows:
Take appropriate mass concentration be 88% formic acid, add water to be settled to 100mL, formic acid concn be diluted to 3%, then plus
Enter 4g citric acid, 4g citric acid and formic acid form organic acid；Add 3g potassium chloride and 1g ammonium chloride, 3g potassium chloride and 1g chlorination
Ammonium forms expansion-resisting agent；Add 3g GLDA and 2g HEDTA, 3g GLDA and 2g HEDTA composition chelating agent；It is eventually adding 0.5g
Water-soluble imidazoline is made environment-friendly type and is acidified working solution as corrosion inhibiter.
In addition, only addition 2g potassium chloride and 2g ammonium chloride are configured to prepad fluid/after pad in 100mL water.
Embodiment 2
The embodiment of the present invention 2 environment-friendly type acidification working solution the preparation method is as follows:
Take appropriate mass concentration be 88% formic acid, add water to be settled to 100mL, formic acid concn be diluted to 5%, then plus
Enter 3g citric acid, 3g citric acid and formic acid form organic acid；Add 2g potassium chloride and 2g ammonium chloride, 2g potassium chloride and 2g chlorination
Ammonium forms expansion-resisting agent；Add 4g GLDA and 1g HEDTA, 4g GLDA and 1g HEDTA composition chelating agent；It is eventually adding 0.8g
Water-soluble imidazoline is made environment-friendly type and is acidified working solution as corrosion inhibiter.
Embodiment 3
The embodiment of the present invention 3 environment-friendly type acidification working solution the preparation method is as follows:
Take appropriate mass concentration be 88% formic acid, add water to be settled to 100mL, formic acid concn be diluted to 4%, then plus
Enter 5g citric acid, 5g citric acid and formic acid form organic acid；Add 1g potassium chloride and 3g ammonium chloride, 1g potassium chloride and 3g chlorination
Ammonium forms expansion-resisting agent；Add 3g GLDA and 1g HEDTA, 3g GLDA and 1g HEDTA composition chelating agent；It is eventually adding 1g water
Dissolubility imidazoline is made environment-friendly type and is acidified working solution as corrosion inhibiter.
One, the present invention analyzes the mineral composition of the village Shan Xicheng area 3# coal petrography rock sample and mineral occurrence:
Laboratory apparatus: X ' Pert PRO ray powder diffraction instrument, (FEI has 200 environmental scanning electron microscope of Quanta
Limit company), in emerging 101 electric drying oven with forced convection.
Experimental analysis step:
(1) coal sample selected by be the shaft bottom coal petrography heart and bulk coal sample, using grinding cymbal grinding from aforementioned coal sample strike under fritter
Coal sample simultaneously sieves with 100 mesh sieve net.
(2) coal dust sieved with 100 mesh sieve paves on smooth and clean sample presentation disk, is placed in electric drying oven with forced convection, does
Dry temperature is 60 DEG C, and drying is taken out afterwards for 24 hours.
(3) using the minerals and noncrystalline content in K value quantitative analysis method measurement coal sample, the results are shown in Table 1.
1 village Shan Xicheng area 3# coal petrography mineral composition of table
| Mineralogical composition | Chlorite | Kaolinite | Illite | Ankerite | Noncrystalline content |
| Content/% | 7 | 18 | 10 | 2 | 63 |
(4) small coal rock sample product is taken to observe using 200 environmental scanning electron microscope of Quanta in the embodiment of the present invention 1
Environment-friendly type acidification working solution impregnate the configuration of surface of forward and backward coal petrography, as a result respectively as depicted in figs. 1 and 2, compare Fig. 1 and Fig. 2
It can be seen that Fracture Width increases after coal petrography impregnates in the environment-friendly type acidification working solution of the embodiment of the present invention 1.
Two, the environment-friendly type acidification working solution for being suitable for coal-bed-gas production-increase in the present invention comments coal petrography static state corrosion effect
Valence:
Laboratory apparatus: beaker, electronic balance (are accurate to 0.01g), glass funnel etc..
Slack coal preparation: the selection village the Shan Xicheng 3# coal petrography heart smashes it through 100 mesh screens, slack coal grain is ensured after repeated screening
Spend uniform, the slack coal of sieving is dried 4h at 80 DEG C, be put into drying bottle after dry seal it is spare.
Corrosion rate measuring method: dried slack coal taking-up is weighed at room temperature, every part of quality is 4.00g.It will
Slack coal and different acid solutions are poured into wide-mouth bottle by weight the ratio of 1:10, and concussion is stood after coming into full contact with acid solution with slack coal
16h after being filtered after reaction with filter paper, heats after forty minutes in 100 DEG C of drying, weighs filter paper and slack coal quality.Before reaction
The corrosion rate of slack coal Mass Calculation slack coal afterwards, as shown in formula (1)；Calculated result is as shown in table 2 below.It is all useless in this experiment
Acid solution is poured into waste liquor recycling bin and is uniformly processed.
The different acidification working solutions of table 2 are to coal petrography corrosion rate
| Acidifying solution type | Slack coal corrosion rate/% |
| 15% hydrochloric acid | 2.5 |
| Embodiment 1 | 3.99 |
| Embodiment 2 | 5.20 |
| Embodiment 3 | 3.75 |
As can be seen from Table 2, compared with common hydrochloric acid, the acidification work provided in an embodiment of the present invention suitable for coal-bed-gas production-increase
Liquid is stronger to the solution ration of slack coal, and 2.08 times of up to 15% hydrochloric acid.
Three, rock core displacement test simulates the environment-friendly type suitable for coal-bed-gas production-increase of the invention and is acidified working solution real work
Situation:
Laboratory apparatus: special type rock core machine for placing, LCMP-1A metallographic specimen polished machine, TC-50 type rock core are acidified flowing experiment
Instrument.
Experimental method:
(1) the coal petrography heart drills through.Special type rock core machine for placing switch is opened, guarantees that drill bit energy normal rotation and water recycle energy
Cooling drill bit；It turns off the switch, coal cinder is greater than at 20mm thickness after being directed at drill bit and is fixed on the table, to guarantee drilling through
It is not shaken acutely in journey；It turns on the switch, rotating rocker carries out drilling through the coal petrography heart.
(2) coal sample of production polishing.The purpose polished to the coal sample drilled through is to obtain more smooth, clean ideal
Surface, so that data are accurately reliable.Surfacing, uniform broken coal cinder are selected as far as possible, utilize metallographic specimen grinding and polishing
Machine carries out the sanding and polishing on coal sample surface, selects constant speed 800r/min, the sand paper selected is 1000 mesh, two coals of every sanding and polishing
Sample carries out a sand paper replacement, and the coal sample polished is put into electric drying oven with forced convection, is arranged 120 DEG C of temperature, takes after 0.5h
The coal sample polished out.
(3) guarantee liquid storage container in TC-50 type rock core acidification flowing experiment instrument, liquid is sufficient in various pumps；Open instrument
Ready rock sample is put into core holding unit gum cover pipe, loads onto clamper plug, slightly hold out against rock sample by each section power supply；It beats
Open loop press pump valve, when being pressurized to 4.0MPa or so, cyclization press pump valve；Computer software is opened, progress equipment is online, and selection is permanent
Stream mode, setting constant current speed are 0.5mL/min.After software normally connects instrument, the container valve that prepad fluid is housed is opened, is opened
The variation of beginning observation upstream pressure；After upstream pressure keeps stablizing, starts injection acid solution and measure, close and prepad fluid is housed
Container valve illustrate acid solution and completely infiltration at this time until observing and carrying out changing liquid after upstream pressure has apparent pressure drop,
The connectivity of coal hole enhances；The container valve that acid solution is housed is closed, the container valve that after pad is housed is opened, injects postposition
Liquid, observes its upstream pressure and liquid surveys the variation of permeability.
Fig. 3 and Fig. 4 has recorded environment-friendly type acidification working solution displacement acid of the coal petrography heart in 5% hydrochloric acid and embodiment 1 respectively
Permeability variation situation is surveyed in pressure drop and liquid during change.The result shows that 5% hydrochloric acid displacement can cause the secondary wound to reservoir
Evil, coal petrography liquid surveys permeability and is reduced to 0.042mD by 0.052mD, and the acidification Working solution prescription that embodiment 1 provides can make
The liquid of the coal petrography heart surveys permeability and is increased to 0.048mD by 0.039mD.
Four, the influence suitable for the environment-friendly type acidification working solution of coal-bed-gas production-increase to coal petrography porosity of the invention:
Laboratory apparatus: JHCSI- rock core evacuates saturation experiments device；Rock core machine for placing；Electronic balance etc..
Experimental method:
(1) NH that mass fraction is 5% is prepared4Cl solution.
(2) the coal petrography heart before and after the acidification working solution displacement for using 1-3 of the embodiment of the present invention to provide is put into sieve, is set
In electric drying oven with forced convection, setting temperature is 120 DEG C, takes out and is put into vacuscope after 1h, and sealing is taken out after extracting 4h, is claimed
Weight, retains 2 decimals.Vacuscope is in order to which gas in coal petrography heart hole to be completely drawn out.
(3) each nuts after weighing individually are placed in beaker, are handled with care in moving process, guarantee nuts not
Appearance is fallen to consider phenomenon to be worth doing, if occurring, replaces coal cinder；It simultaneously numbers record coal cinder position；Sequentially add 5%NH4Cl solution impregnates for 24 hours
After take out, coal cinder surface liquid is carefully blotted with filter paper, weigh, record data.According to following water absorption rate formula (2), can obtain
Porosity:
Use the acidification working solution displacement suitable for coal-bed-gas production-increase forward and backward coal sample porosity variation such as following table of the invention
Shown in 3, as can be seen from Table 3 after acidification working solution displacement provided by the invention, the porosity maximum of the coal petrography heart can increase
37.17%.
Porosity variation before and after 3 coal rock core displacement of table
| Displacing medium | Porosity/% before displacement | Porosity/% after displacement | Increase multiple/% |
| Embodiment 1 | 3.74 | 5.13 | 37.17 |
| Embodiment 2 | 2.87 | 3.57 | 24.39 |
| Embodiment 3 | 2.31 | 2.79 | 20.78 |
Five, the influence suitable for the acidification working solution of coal-bed-gas production-increase to coal petrography gas permeability of the invention:
Laboratory apparatus: JHGP gas permeability detector etc..
Experimental method: the coal petrography heart before and after the acidification working solution displacement for using 1-3 of the embodiment of the present invention to provide is packed into rock
In heart clamp holder, the left and right sides is fixed；Nitrogen cylinder switch is opened, ring is adjusted and is pressed in 1.2MPa；Upstream pressure is adjusted, upstream is recorded
The numerical value of pressure and flow, each sample are read data three times, are averaged.After experiment, first closes upstream pressure and adjust
Valve opens vent valve, gas in pipelines is released, and closes nitrogen bottle valve, opens left side vent valve, will remain in nitrogen cylinder bottle
The gas of mouth is released, and experimental result is as shown in table 4, it can be found that the coal petrography heart is in the gas permeability after aforementioned displacement test
It is significantly improved, reaches as high as 5.48 times.
The variation of coal core permeability before and after 4 displacement of table
| Displacing medium | Permeability/mD before displacement | Permeability/mD after displacement | Increase multiple |
| Embodiment 1 | 0.26 | 0.99 | 2.81 |
| Embodiment 2 | 0.71 | 0.77 | 0.08 |
| Embodiment 3 | 0.21 | 1.36 | 5.48 |
Six, erosion analysis of the acidification working solution for being suitable for coal-bed-gas production-increase of the invention to P110 test piece:
Laboratory apparatus: electronic balance (being accurate to 0.01g) etc..
Experimental method: this experimental procedure is according to People's Republic of China (PRC) oil and gas industry standard " SY/T5405-
1996 " it carries out.
(1) it takes out P110 type standard corrosion coupon and ties up to test piece hole with plastics filament with its size of vernier caliper measurement
On, the other end ties up on glass bar, keeps suspended state, test piece number is organized using knotting number as same, and test piece itself is numbered,
Initial mass records in the table.
(2) it is tested under room temperature: the test piece monolithic fastened being hung, is put into beaker according to certain intervals, according to every square
Centimetre strip product acid solution dosage 20cm3, configured acid solution is successively poured into beaker, guarantees that acid solution all impregnates examination
Piece, and beaker surface is covered with preservative film.
(4) the record reaction time started is reacted to the predetermined time, takes out test piece, is rinsed immediately with clear water, then use banister brush
Scrub, cuts plastics filament, and filter paper dries strip, records comparison of being taken pictures after quality with initial test piece.
(5) corrosion rate is calculated by formula (3):
In formula: vi- monolithic corrosion rate, g/ (m2·h)；△ t-reaction time, h；△miVector, g are corroded in-test piece；
A-strip product, mm2。
This experimental standard corrosion coupon is 2800mm2；P110 type standard corrosion coupon is in different acidification working solutions
Corrosion rate is as shown in table 5 below.
Corrosion rate of the 5 P110 type standard corrosion coupon of table in different acidification working solutions
| Tested media | Corrosion rate g/ (m2·h) |
| Embodiment 1 | 0.39 |
| Embodiment 2 | 0.54 |
| Embodiment 3 | 0.58 |
| 15% hydrochloric acid | 4.91 |
As shown in Table 5,1-3 of the embodiment of the present invention propose environment-friendly type acidification working solution to P110 test piece corrosion rate compared with
It is low, only up to the 11.88% of 15% hydrochloric acid, illustrate environment-friendly type acidification working solution in the present invention to the injury of shaft bottom tubing compared with
It is small.
In conclusion the invention proposes a kind of environment-friendly types suitable for the volume increase of hypotonic coalbed methane reservoir to be acidified working solution,
Acid solution therein is organic acid (formic acid and citric acid), and slow speed effect is preferable, and to the later period, the coal quality of production has no adverse effects；
It joined chelating agent GLDA and HEDTA simultaneously, can effectively chelate the metal ions such as calcium, iron, magnesium, and then generate and stablize, is solvable
Chelate, avoid generating the precipitating such as iron hydroxide, enhance acidizing effect；The corrosion to down-hole equipment is reduced simultaneously, to ring
Border is friendly.
In the absence of conflict, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. it is a kind of suitable for hypotonic coalbed methane reservoir volume increase environment-friendly type be acidified working solution, which is characterized in that the working solution by
Organic acid, chelating agent, expansion-resisting agent, corrosion inhibiter and water mix, and include each component of following mass parts in every 100 parts of water: having
7-9 parts of machine acid, 4-5 parts of chelating agent, 4 parts of expansion-resisting agent, 0.5-1 parts of corrosion inhibiter.
2. a kind of environment-friendly type suitable for the volume increase of hypotonic coalbed methane reservoir according to claim 1 is acidified working solution, special
Sign is that the organic acid is made of formic acid and citric acid.
3. a kind of environment-friendly type suitable for the volume increase of hypotonic coalbed methane reservoir according to claim 2 is acidified working solution, special
Sign is that the mass parts of the formic acid are 3-5 parts, and the mass parts of citric acid are 3-5 parts.
4. a kind of environment-friendly type suitable for the volume increase of hypotonic coalbed methane reservoir according to claim 1 is acidified working solution, special
Sign is that the chelating agent is by glutamic acid N, N- oxalic acid and N- beta-hydroxy ethyl-3-acetic acid ethylenediamine composition.
5. a kind of environment-friendly type suitable for the volume increase of hypotonic coalbed methane reservoir according to claim 4 is acidified working solution, special
Sign is that the mass parts of the glutamic acid N, N- oxalic acid are 3-4 parts, and the mass parts of N- beta-hydroxy ethyl-3-acetic acid ethylenediamine are
1-2 parts.
6. a kind of environment-friendly type suitable for the volume increase of hypotonic coalbed methane reservoir according to claim 1 is acidified working solution, special
Sign is that the expansion-resisting agent is made of potassium chloride and ammonium chloride.
7. a kind of environment-friendly type suitable for the volume increase of hypotonic coalbed methane reservoir according to claim 6 is acidified working solution, special
Sign is that the mass parts of the potassium chloride are 1-3 parts, and the mass parts of ammonium chloride are 1-3 parts.
8. a kind of environment-friendly type suitable for the volume increase of hypotonic coalbed methane reservoir according to claim 1 is acidified working solution, special
Sign is that the corrosion inhibiter is imidazoline.
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| CN112358863A (en) * | 2021-01-12 | 2021-02-12 | 山东圣哲石油装备有限公司 | Chemical yield increasing liquid for low-permeability oil layer and yield increasing method |
| CN112780246A (en) * | 2021-02-28 | 2021-05-11 | 西南石油大学 | Organic acid solution treatment method for enhancing and maintaining flow conductivity of tight sandstone reservoir fracture |
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