CN102828734B - Offshore oilfield water injection well online one-step-process acidification technology - Google Patents
Offshore oilfield water injection well online one-step-process acidification technology Download PDFInfo
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Abstract
The invention relates to an offshore oilfield water injection well online one-step-process acidification technology, which comprises following steps of (1) preparing one-step acid liquor, wherein the one-step acid liquor consists of following components by weight percent: 20 to 40 percent of industrial acetic acid, 15 to 40 percent of industrial hydrochloric acid, 3 to 15 percent of deposition inhibitor, 5 to 15 percent of discharging aiding agent, 3 to 15 percent of corrosion inhibitor, 5 to 15 percent of antiswelling agent, 5 to 15 percent of iron ion stabilizer and 2 to 10 percent of hydrogen fluoride; (2) storing the acid liquor into an acid storage tank of an injection system, wherein the injection system consists of the acid storage tank, an acid resistant pump, a motor, a frequency converter, a flow sensor, a pressure sensor, a computer, a check valve, a three-way pipe and an acid injection pipe; (3) utilizing the acid resistant pump to pump the acid liquor into the water injection flow; (4) monitoring the variation of the pressure and the flow of the injected acid, and calculating skin coefficients in real time; and (5) keeping the water injection after stopping the acid injection. Due to the adoption of the offshore oilfield water injection well online one-step-process acidification technology, high efficiency, rapidness and large scale in plug removal of an offshore oilfield water injection well can be realized, the water injection pressure can be reduced, and the water injection quantity can be improved.
Description
Art
The present invention relates to the water injection well Acidizing Technology in offshore oilfield underground work engineering, particularly one is intended to efficiently, fast reduce well intake pressure, improves the online single-step method Acidizing Technology of water injection well water absorbing capacity.
Technical background
Offshore oilfield production platform restricted lifetime (being generally 20 years), in order to Efficient Development oil field, extraction in-place oils as far as possible many within the platform life span phase, takes waterflooding extraction mode to improve recovery ratio, shorten the development time.
Along with the increase of water injection time, there is near wellbore zone blocking in offshore oilfield water injection well gradually, and cause stratum water absorbing capacity to decline, injection pressure raises, and injection rate declines.As 25-1S oil field, 19-3 oil field, Kang Fei Peng Lai etc. in CNOOC's Bohai Sea, water filling initial stage water injection pressure is low, along with the injecting process carries out, near wellbore zone is subject to injecting the blocking of water suspension, water oil-containing, corrosion product, bacterium and metabolite thereof, cause water injection rate sharply to decline, do not reach oil reservoir injection allocation requirement; Injection pressure rises gradually, and a lot of well injection pressure rises to the level close to even exceeding formation fracture pressure.Thisly seriously to short, phenomenon that superpressure is injected also exists various disadvantages: 1) injection pressure is high, and it is large that equipment runs energy-output ratio, wastes energy; 2) production platform water filling flow process high-voltage operation, potential safety hazard is large; 3) injection pressure is high, easily crushes reservoir, crude oil may be caused to leak in seawater along crack, cause serious environment pollution, as 19-3 oil field, Peng Lai oil spill events; 4) have a strong impact on development effectiveness, the efficient fast Development in oil field cannot be realized.Therefore, in order to efficient fast Development offshore oilfield, must carry out carrying out de-plugging operation to improve reservoir water absorbing capacity to water injection well, reduce injection pressure.
The main component of offshore oilfield water injection well obstruction is oil-containing and bacterium and metabolite etc. thereof in solid suspension, corrosion product (being mainly ferrous carbonate), fouling, water, this mainly offshore oilfield injection water quality can not reach industry standard and the result caused.Water quality reason not up to standard is mainly: 1) offshore production platform deck space is narrow and small, limited load bearing capacities, and Injection Water Treatments equipment is few, and water treatment process is simple and short, and treatment effect is limited, causes injection water quality generally poor; 2) offshore platform is away from land, and after using production waste and other layer of position formation water mixing, water water source is injected in conduct, and produced water water type is generally different (if extraction layer is NaHCO from the water type of implanted layer
3water type, implanted layer is CaCl
2, MgCl
2water type), generally all can there is scale formation after the two mixing; 3) at present offshore oilfield tubing and casing and injection pipe network material mostly are ordinary carbon steel, and resistance to corrosion is limited, enter injection water being subject to injecting aqueous corrosion post-etching product, also make water degradation.
Acidification to dispel block can effectively remove blocking composition, improves reservoir water absorbing capacity, reduces injection pressure, increases injection rate, ensures oil field Efficient Development.Therefore, the de-plugging of offshore oilfield water injection well often takes acidification to dispel block.
For the most popular treatment fluid of sandstone reservoir water injection well acidification to dispel block be mud acid (mixture of hydrofluoric acid and hydrochloric acid), fluoboric acid and other slowly can produce the retarded acid liquid system of HF, by main body treatment acid solution dissolved solid suspension, corrosion product and fouling etc.In order to efficient solution is except obstruction, prevent secondary injury simultaneously, when actual acidizing treatment, often adopt four sections of liquid and four step rule treatment process, namely the whole working procedure of existing offshore oilfield water injection well acidification technique is: note prepad fluid → note treatment fluid → note after pad → note displacement fluid.Wherein prepad fluid is used for dissolved carbon Carbonate Rocks, isolation formation water, maintains lower ph, prevents precipitation from producing; Treatment fluid is the main acid solution of dissolving obstruction; After pad is used for purification band, prevents secondary precipitation, ensures acidizing effect; Displacement fluid is used for acid solution in pit shaft to replace to earth formation deep.
But, when current offshore oilfield water injection well occurs that near wellbore zone blocks, injection pressure is too high on a large scale, existing " note prepad fluid → note treatment fluid → note after pad → note displacement fluid " working procedure exposes some drawbacks to offshore oilfield bad adaptability: 1) acid fluid system complexity, acid solution tank and other auxiliary equipment many, take boats and ships, platform space is many, moving bothers, and takes time and effort; 2) working procedure is comparatively complicated, and labour intensity is higher; 3) operation exclusivity is strong, cannot carry out other operation, namely cannot implement cross-operation during acidizing treatment; 4) treatment fluid scale optimization design difficulty is large, and scale selection is improper easily causes plugging removal effect thoroughly or waste acid solution; 5) be difficult to implement acidification to dispel block operation on a large scale; 6) operating cost is high.
In order to ensure oil field Efficient Development, for offshore oilfield feature, developing really quick, easy water injection well acidification to dispel block technology and having great importance.
Summary of the invention
The object of the present invention is to provide the online single-step method Acidizing Technology of offshore oilfield water injection well, by On-line construction, realize offshore oilfield water injection well efficient, fast, scale de-plugging, reduce water injection pressure, improve water injection rate.
For reaching above-mentioned technical purpose, the invention provides following technical scheme.
By the prepad fluid that uses a kind of new and effective single acid solution (being called single step acid) to replace using in conventional art, treatment fluid, liquid that after pad and displacement fluid four kinds of functions are different, greatly simplify acid formula and working procedure, shorten the engineering time; Use custom-designed injected system; realize acid solution being injected stratum (On-line construction) under the condition of not stopping water filling flow process; flooding production is kept while acidifying; farthest reduce acidizing treatment taking and impact on other operation platform; can cross-operation be implemented, greatly simplify construction sequence, shorten the engineering time; permission multilayer focuses on, and realizes scale benefit.
The key of the online single-step method Acidizing Technology of offshore oilfield water injection well is:
1. prepare single step acid: single step acid have plugging removal effect good, effectively prevent secondary precipitation, effectively stablize small bits of clay, surface tension low with inject the excellent properties such as compatible, the prepad fluid that can replace using in conventional art, treatment fluid, the liquid that after pad and displacement fluid four kinds of functions are different, ensure the enforcement of offshore oilfield water injection well single-step method acidifying.
2. design injected system: under the condition not stopping water filling flow process, acid solution is pumped into water injection manifold journey, realize online acidizing treatment; The parameters such as the pressure in Real-Time Monitoring injection process, flow, real-time judge plugging removal effect, at once stops acid filling after reaching expection plugging removal effect, ensures acidizing effect, save acid solution consumption; Skid, volume are little, highly integrated, are convenient to moving, take platform area little.
The online single-step method Acidizing Technology of offshore oilfield water injection well, comprises the following steps successively:
(1) prepare single step acid solution, described single step acid solution is made up of by weight following component: industrial acetic 20 ~ 40%, technical hydrochloric acid 15 ~ 40%, precipitating inhibitor 3 ~ 15%, cleanup additive 5 ~ 15%, corrosion inhibiter 3 ~ 15%, expansion-resisting agent 5 ~ 15%, ferrous stability 5 ~ 15%, hydrogen fluoride 2 ~ 10%.
Described precipitating inhibitor is two 1,6-hexamethylene triamine five methylenephosphonic acid (BHMTPMPA), Pidolidone, maleic acid-acrylic acid copolymer (MA/AA), 2-phosphonobutane-1,2,4-tricarboxylic acids (PBTCA) or its mixture, precipitating inhibitor can form water soluble chelate compound with the fouling metal ion in residual acid solution, has the ability of good elimination acidization secondary precipitation.Be mainly used in the process such as acidification of oil field, Treatment of Industrial Water, eliminate scale-forming ion.
Described cleanup additive is NPE (OP-10), polyethylene glycol, perfluor 2,5,8-trimethyl-3,6,9-trioxa dodecoic acid (salt) or its mixture, have the ability of stronger reduction oil water interfacial tension, also there is stronger anti-newborn breakdown of emulsion ability, to be mainly used in oil field compression fracture, acidizing treatment, to reduce oil water interfacial tension and anti-newborn breakdown of emulsion, significantly improving drain age velocity, to reduce reservoir damage.
Described corrosion inhibiter is oleic acid, diethylenetriamine, formaldehyde, NPE (OP-10) or its mixture; by forming absorption diaphragm at metal surface oriented attachment; suppress acid and intermetallic electrode reaction; be applicable to multiple corrosive medium, the unidirectional corrosion of ion and the interaction of multielement and the comprehensive corrosion that produces the corrosive environment deposited, to the corrosive environment of concentrated hydrochloric acid, there is good against corrosion, resistance erosion, corrosion inhibition.Inhibition for acidification of oil gas well implement and pipe network is anticorrosion.
Described expansion-resisting agent is 2,3 epoxypropyltrimethylchloride chlorides, gamma-aminopropyl triethoxy silane or its mixture, and expansion-resisting agent, by the effect such as molecular separating force and hydrogen bond force, is firmly adsorbed on surface of clay.There is the effect preventing reservoir CLAY MINERALS AND THEIR SIGNIFICANCE hydration swelling and dispersion migration.
Described ferrous stability is ethylenediamine tetra-acetic acid (EDTA), citric acid or its mixture, for by Fe
3+be reduced to Fe
2+and complexing and chelating Fe
3+, stablize iron ion, prevent iron ion to be hydrolyzed in acid, prevent iron gel precipitation.
(2) the single step acid solution that upper step is prepared is stored in the acid storage tank of injected system, described injected system is primarily of acid storage tank, acid-proof pump, motor, frequency converter, flow transmitter, pressure sensor, computer, ball-and-seat, tee piece, acid filling pipeline forms, described acid storage tank connects acid-proof pump and ball-and-seat by acid filling pipeline, described acidproof Pump and Electromotor, frequency converter is connected, described acid filling pipeline is provided with flow transmitter and pressure sensor, described flow transmitter, pressure sensor is all connected with computer, described ball-and-seat is connected with tee piece by acid filling pipeline, the other two ends of described tee piece connect waterflood-transmission line and wellhead of water injection well respectively.
The single step acid solution that acid storage tank has configured for being stored in land, flow transmitter is for measuring acid solution changes in flow rate, pressure sensor is for measuring injection pressure change, acid-proof pump is used for acid solution to pump into water injection manifold journey, change power frequency by frequency converter thus regulate motor speed, realizing pumpage and control.Ball-and-seat, for ensureing that flow direction can only be that acid solution flows into water filling flow process, injects water and can not flow into acid filling flow process.Tee piece is the connection valve of acid filling pipeline and waterflood-transmission line, for controlling being communicated with of acid filling pipeline and waterflood-transmission line.
Computer system is data acquisition and real-time monitoring system, is connected with flow transmitter, pressure sensor, for gathering flow and pressure data, and calculates skin factor in real time according to flow and pressure data.
(3) in water filling flow process, pump into single step acid acid solution by acid-proof pump, acid filling amount and water injection rate ratio are generally volume ratio V
single step acid: V
inject water=1:2 ~ 2:5, water injection rate scope 2 ~ 75m
3/ h, acid filling weight range 1 ~ 30m
3/ h, injection pressure is no more than formation fracture pressure, is generally 7 ~ 35MPa.
(4) computer monitoring injects flow process acid filling pressure and acid filling changes in flow rate, and calculate skin factor in real time, skin factor stops acid filling after being reduced to desired value at once.
Increase gradually along with acid solution enters stratum amount, blocking obtains efficient solution and removes, and skin factor reduces gradually.When skin factor drops to about 1, degree of contamination is very light, can be used as the foundation stopping acid filling.
(5) after stopping acid filling, water injecting pump does not stop, and continues water filling.
The technological process of offshore oilfield water injection well online single-step method acidifying: single step de-plugging acid solution has prepared rear loading acid storage tank; Injected system and auxiliary equipment are lifted to production platform, does not stop injection process, connect acid filling system to water filling flow process by tee piece, and pressure testing is carried out to pipeline; In water filling flow process, pump into acid solution by acid-proof pump, flow process pressure and changes in flow rate are injected in monitoring, and calculate skin factor in real time, skin factor stops acid filling after being reduced to desired value at once; After stopping acid filling, water injecting pump does not stop, and disconnect acid filling pipeline and be connected with waterflood-transmission line, remove acid filling pipeline, construction terminates.
Compared with prior art, the present invention can significantly save offshore oilfield activity duration, space, expense and manpower, has following remarkable advantage:
1) acid fluid system is significantly simplified, and only uses single liquid, does not need prepad fluid, after pad and displacement fluid etc.; Liquid configuration labour intensity significantly reduces, and loads acid solution tank after land configures, and without the need to situ configuration acid solution, saves the engineering time.
2) acid fluid system have plugging removal effect good, can effectively prevent secondary precipitation, stablize small bits of clay, surface tension low with injection compatible etc. premium properties, according to industry standard SY/T5405-1996 " acidifying corrosion inhibiter evaluation index and experimental technique ", formula acid solution average corrosion rate is respectively 3.71g/ (m
2h), industry standard 5g/ (m is less than
2h), there is excellent corrosion inhibition; The surface tension of acid solution is 22.5mN/m, has lower surface tension; To obstruction corrosion rate >85%, corrosion obstruction ability is strong.
3) On-line construction, does not affect the injecting process, while production, reach de-plugging object.Construction is flexible, according to the size adjustment acid solution injection rate of water injection rate.
4) according to monitoring pressure and discharge capacity result, calculate skin factor determination plugging removal effect in real time, skin factor stops acid filling after being reduced to desired value at once, both effectively ensures acidizing effect, saves acid solution consumption again.
5) can cross-operation, farthest reduce the impact on other operation of production platform.
6) can multilayer, many wells time concentrative operation, reach scale benefit.
7) use equipment few, only have a small-sized acid solution storage tank and the integrated injected system of small-sized skid, take production platform and boats and ships space is little, be easy to moving.
8) easy construction, operation procedure greatly simplifies, and labour intensity is low.
9) comparatively traditional handicraft is low for operating cost, and economy is good.
Accompanying drawing explanation
Fig. 1 is water injection well online single-step method Acidizing Technology injected system schematic diagram.
In figure, 1-acid storage tank, 2-flow transmitter, 3-acid-proof pump, 4-motor, 5-frequency converter, 6-computer, 7-pressure sensor, 8-ball-and-seat, 9-tee piece, 10-water injecting pump, 11-wellhead of water injection well.
Fig. 2 is water injection well online single-step method Acidizing Technology plugging removal effect Lab-evaluation flow curve.
Fig. 3 is QHD32-6-A7 well C layer online single-step method acidizing treatment performance curve.
Fig. 4 is QHD32-6-AW well online single-step method acidizing treatment performance curve.
Detailed description of the invention
Referring to Fig. 1, acid storage tank 1 connects acid-proof pump 3 and ball-and-seat 8 by acid filling pipeline, described acid-proof pump is connected with motor 4 and frequency converter 5, described acid filling pipeline is installed flow transmitter 2 and pressure sensor 7, described flow transmitter, pressure sensor are all connected with computer 6, described ball-and-seat is connected with tee piece 9 by acid filling pipeline, and the other two ends of described tee piece connect water injecting pump 10 and wellhead of water injection well 11 respectively.
Embodiment 1: for 25-1S oil field rock core simulating lab test in CNOOC's Bohai Sea, be described in detail.
Use 25-1S oil field in CNOOC's Bohai Sea to short water injection well shaft bottom and pollute rock core.The long 3.542cm of rock core, diameter 2.52cm, degree of porosity 26%, permeability 1620 × 10
-3μm
2simulating oil deposit condition is 65 DEG C in temperature, and confined pressure is carry out acid solution flowing experiment under 1MPa, according to " note base fluid → note single-step method de-plugging acid solution → note base fluid " injection sequentially, simulate the flow process of acid solution " water filling → injection water notes single step de-plugging acid solution → water filling " in the earth formation.
The each weight percentages of components of online single-step method acidifying single step used acid solution: industrial acetic, 30%; Technical hydrochloric acid, 25%; Precipitating inhibitor, 10%; Cleanup additive, 5%; Corrosion inhibiter, 10%; Expansion-resisting agent, 5%; Ferrous stability, 5%; Hydrogen fluoride, 10%.
Experimental result is as Fig. 2.After injecting single step de-plugging acid solution, core permeability rises gradually, increases to 1.69 times of original permeability gradually; After re-injecting base fluid, core permeability stabilizes to 2.33 times of original permeability.Show that single-step method de-plugging acid solution can efficient solution block except water injection well, recover to improve in-place permeability; Meanwhile, after injecting base fluid, core permeability does not decline, and indicates de-plugging acid solution and effectively can prevent secondary precipitation.Laboratory experiment result shows that de-plugging acid solution can reach the online single-step method block releasing technique of water injection well completely to the requirement of its performance.
Embodiment 2: for the online single-step method acidifying of CNOOC QHD 32-6 Oilfield QHD32-6-A7 water injection well C layer, be described in detail.
Before the acidifying of QHD32-6-A7 well C layer, injection pressure is high, and well head oil pressure is 8.9MPa, and water injection rate is 10m
3/ h, and injection pressure adds that clean head of liquid has the trend being greater than formation fracture pressure.Research shows that A7 well C layer injects water solid suspension and water oil-containing and Fe (OH)
3, CaCO
3dirt causes near wellbore zone to block.In order to ensure the effective exploitation in oil field, online single-step method Acidizing Technology is taked to carry out unblocking and injection increasing operation.
The each weight percentages of components of QHD32-6-A7 water injection well C layer online single-step method acidifying used single step used acid solution: industrial acetic, 35%; Technical hydrochloric acid, 15%; Precipitating inhibitor, 15%; Cleanup additive, 8%; Corrosion inhibiter, 7%; Expansion-resisting agent, 5%; Ferrous stability, 5%; Hydrogen fluoride, 10%.Prepare 20m altogether
3it is 30m that acid solution loads capacity
3skid acid solution tank.Utilize boats and ships by 30m
3skid acid solution tank, the small-sized integrated injected system of skid and supporting pipelines are transported to production platform and by platform crane lifting to Platform Deck.
The online single-step method acidization of CNOOC QHD 32-6 Oilfield QHD32-6-A7 water injection well C layer is:
The first step: connect acid solution tank to acid filling flow process, then connect acid filling system to water filling flow process, carry out pressure testing to pipeline, pressure testing 15MPa, after the 10min that builds the pressure, do not sting leakage, pressure testing is qualified;
Second step: require to consider according to the actual imbibition ability of A7 well C layer, well intake pressure and acidification technique, set acid filling amount and water injection rate ratio V in computer data acquisition system
single step acid: V
inject water=2:5, acid filling discharge capacity is between 5.7 ~ 14.3m
3/ h;
3rd step: open acid filling pipeline and be connected with waterflood-transmission line, then open acid filling pump, pump into acid solution to waterflood-transmission line;
4th step: monitoring pressure in real time sensor and Electromagnetic Flow count, guarantees that acid solution tank acid solution is not depleted; According to the actual conditions of well, setting skin factor desired value is 1.5; When epidermis drops to desired value, system stops acid filling pump at once automatically, and now well head injects and drops to 1.5MPa;
5th step: keep water filling, removes acid filling pipeline, and construction terminates.
Acidizing treatment performance curve is shown in Fig. 3.As can be seen from the differentiation of construction curve, blocking is there is before this well acidizing, single step acid solution relieves near wellbore zone blocking after entering stratum: showing as acid solution, to enter front stratum, stratum imbibition ability poor, infusion pressure higher (9.66MPa), water filling flow process pump discharge pressure high (9.7MPa); Along with acid solution radial direction enters around near wellbore zone, stratum imbibition ability be improved significantly, show as that infusion pressure obviously reduces, discharge capacity significantly rises.At the end of construction, well intake pressure drops to 1.5MPa by the 9.3MPa before constructing, and injection rate is by the 5.3m before constructing
3/ h increases to 10m
3/ h.
The acidifying of QHD32-6-A7 water injection well C layer online single-step method achieves significant unblocking and injection increasing effect, and success relieves near wellbore zone obstruction effectively, and de-plugging feature is obvious, and stratum imbibition ability improves greatly, has recovered target well section water injection capacity.In work progress, water injection well C layer water filling flow process is run always, does not interrupt water filling, does not disturb other layer of position water filling flow process, construction simple and fast.
Embodiment 3: for the online single-step method acidifying of CNOOC's QHD 32-6 Oilfield QHD32-6-AW water injection well, be described in detail.
Before the acidifying of QHD32-6-AW water injection well, injection pressure is 9.5MPa, and daily water-injection rate is 22m
3/ h.Because pump pressure is close to rated operating pressure, inject comparatively difficulty, research shows that AW well injects water solid suspension and water oil-containing and Fe (OH)
3, CaCO
3dirt causes near wellbore zone to block.
QHD32-6-AW water injection well online single-step method acidifying acid solution each composition weight percentage is identical with embodiment 2.Prepare 30m altogether
3it is 30m that acid solution loads capacity
3skid acid solution tank.
CNOOC QHD 32-6 Oilfield QHD32-6-AW water injection well online single-step method acidization is substantially the same manner as Example 2, acid filling amount and water injection rate ratio V
single step acid: V
inject water=1:2, acid filling discharge capacity is between 9.5-23.9m
3/ h, skin factor desired value is 1.
Acidizing treatment performance curve is shown in Fig. 4.As can be seen from the differentiation of construction curve, along with acid solution radial direction enters around near wellbore zone, stratum imbibition ability be improved significantly, show as that infusion pressure obviously reduces, discharge capacity significantly rises.At the end of construction, well intake pressure drops to 0.5MPa by the 9.5MPa before constructing, and injection rate is by the 22m before constructing
3/ h increases to 50m
3/ h.
After embodiment 2 and the construction results of embodiment 3 indicate online single-step method acidification, stratum imbibition ability improves greatly, demonstrates the validity of acid solution de-plugging, embodies the performances such as outstanding slow, the chelating of single step acid solution, scale suppression; Eliminate prepad fluid in classical acid metallization processes, after pad and displacement fluid stage, infusion program is simple, and site operative is strong; Use acid solution tank few compared with classical acid metallization processes, fluid volume reduces, and effectively alleviates platform load; Do not close down water injection manifold journey during acidizing treatment, reduce the potential injury brought out by pressure excitement, at utmost reduce other j ob impact yet, at utmost ensured production.
In sum, energy efficient solution of the present invention is except the nearly well blocking of water injection well, and renwing stratum water absorbing capacity, reduces injection pressure, its easy construction, and operation while of intersecting with other layer of position water filling, is applicable to extensive mass operation.
Claims (5)
1. the online single-step method acidization tool of offshore oilfield water injection well, comprises the following steps successively:
(1) prepare single step acid solution, described single step acid solution is made up of by weight following component: industrial acetic 20 ~ 40%, technical hydrochloric acid 15 ~ 40%, precipitating inhibitor 3 ~ 15%, cleanup additive 5 ~ 15%, corrosion inhibiter 3 ~ 15%, expansion-resisting agent 5 ~ 15%, ferrous stability 5 ~ 15%, hydrogen fluoride 2 ~ 10%, described precipitating inhibitor is two 1,6-hexamethylene triamine five methylenephosphonic acid, Pidolidone, maleic acid-acrylic acid copolymer, 2-phosphonobutane-1,2,4-tricarboxylic acids or its mixture;
(2) the single step acid solution that upper step is prepared is stored in the acid storage tank of injected system, described injected system is primarily of acid storage tank, acid-proof pump, motor, frequency converter, flow transmitter, pressure sensor, computer, ball-and-seat, tee piece, acid filling pipeline forms, described acid storage tank connects acid-proof pump and ball-and-seat by acid filling pipeline, described acidproof Pump and Electromotor, frequency converter is connected, described acid filling pipeline is provided with flow transmitter and pressure sensor, described flow transmitter, pressure sensor is all connected with computer, described ball-and-seat is connected with tee piece by acid filling pipeline, the other two ends of described tee piece connect waterflood-transmission line and wellhead of water injection well respectively,
(3) in water filling flow process, pump into single step acid solution by acid-proof pump, acid filling amount and water injection rate ratio are volume ratio V
single step acid: V
inject water=1:2 ~ 2:5;
(4) computer monitoring injects flow process acid filling pressure and acid filling changes in flow rate, and calculate skin factor in real time, skin factor stops acid filling after being reduced to desired value at once;
(5) after stopping acid filling, water injecting pump does not stop, and continues flooding production.
2. single-step method acidization tool as claimed in claim 1, it is characterized in that, described cleanup additive is NPE, polyethylene glycol, perfluor 2,5,8-trimethyl-3,6,9-trioxa dodecoic acid (salt) or its mixture.
3. single-step method acidization tool as claimed in claim 1, it is characterized in that, described corrosion inhibiter is oleic acid, diethylenetriamine, formaldehyde, NPE or its mixture.
4. single-step method acidization tool as claimed in claim 1, it is characterized in that, described expansion-resisting agent is 2,3 epoxypropyltrimethylchloride chlorides, gamma-aminopropyl triethoxy silane or its mixture.
5. single-step method acidization tool as claimed in claim 1, it is characterized in that, described ferrous stability is ethylenediamine tetra-acetic acid, citric acid or its mixture.
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