CN103573235B - Water injection well fixed tubular column acidifying increasing injection process - Google Patents
Water injection well fixed tubular column acidifying increasing injection process Download PDFInfo
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Abstract
The invention discloses a kind of water injection well fixed tubular column acidifying increasing injection process, its step is as follows: a, with volume basis, takes faint acid acidifying solution 0.3～3 part and mixes with 99.7～97 parts of water of injection; B, by drop injection mode, mixed liquor is injected in back with water inlet line; C, when reach set injection allocation amount and water injection well pressure be reduced to construction before water injection pressure 90% time, stop inject mixed liquor; Described faint acid acidifying solution is: by weight percentage, its component is: acid solution: 10 ~ 30%; Stabilizer: 2 ~ 8%; Corrosion inhibiter: 1 ~ 5%; Surfactant: 6.5 ~ 17%; Surplus is distilled water. This method expands water injection well acidifying plug removal radius, alleviates water injection well near wellbore fouling, extends water injection well effect duration; Achieve the continuous mixture acidifying of fixed tubular column, simplify working procedure; Water filling acidifying is synchronously performed and does not affect well and normally produce.
Description
Technical field
The present invention relates to water injection well increasing injection process technical field, particularly relate to one and make low permeability oil field sandstone oil reservoir water injection well acidifying increasing injection, acidifying plug removal radius is big, effect duration increases, the continuous mixture acidifying of fixed tubular column and water filling are synchronously performed, and do not affect the increasing injection process of normal production.
Background technology
In the process of current LOW PERMEABILITY OILFIELD DEVELOPMENT, waterflood enhanced recovery is passed through in the decay with stratum energy, such as publication number is CN202250005U, the Chinese patent literature that publication date is on May 30th, 2012 discloses a kind of water injection well increasing injection device, it is applied to water injection well in oil fields, in water injection well, injects surfactant. High pressure water injection pipeline is had between water injection well distributing room for water injection and wellhead of water injection well; The entrance of explosive box is fixed with pipeline, has been sequentially connected in series a low pressure valve, an electrodynamic pump and a valve, can be injected in explosive box by increasing injection medicament by electrodynamic pump on pipeline. Outlet at explosive box is connected to tapping line, is connected with gate valve, driven high voltage ratio dosing pump and ball-and-seat on tapping line in turn, and the other end of tapping line connects with high pressure water injection pipeline. Effect is: continuously can inject increasing injection medicament to water injection well by a certain percentage, can reduce the injection pressure of wellhead of water injection well; The injection rate of driven high voltage ratio dosing pump can be adjusted simultaneously.
But in water injection well production process, owing to injecting being incompatible of water and formation water, can in the slow fouling of water injection well pit shaft and near wellbore zone, injection pressure is caused to be stepped up, injection allocation amount reduces, and is finally changed into water injection well high pressure and shorts, and corresponding oil well energy is not enough.
Acidifying measure implemented by water injection well needs to be sequentially carried out stopping water filling, pressure release, changes tubing string, plays lower tubular column, acid filling, closing well, the row of returning, plays lower tubular column, 7～14 days consuming time.Corresponding well group oil well output successively decreases substantially during this period, series of problems hence for current low permeability oil field sandstone oil reservoir water injection well acidizing treatment, it is necessary to research and develop a kind of water injection well fixed tubular column acidifying increasing injection process, water injection well is made to implement the acidifying measure normal water filling of water injection well simultaneously, keep corresponding oil-well strata pressure, make increasing injection and water filling be synchronously performed.
Summary of the invention
It is contemplated that defect existing for above-mentioned prior art and deficiency, a kind of water injection well fixed tubular column acidifying increasing injection process is provided, this method expands water injection well acidifying plug removal radius, alleviates water injection well near wellbore fouling, extends water injection well effect duration; Achieve the continuous mixture acidifying of fixed tubular column, simplify working procedure; Water filling acidifying is synchronously performed and does not affect well and normally produce.
The present invention realizes by adopting following technical proposals:
A kind of water injection well fixed tubular column acidifying increasing injection process, it is characterised in that step is as follows:
A, with volume basis, take faint acid acidifying solution 0.3～3 part with injection 99.7～97 parts of water mix;
B, by drop injection mode, mixed liquor is injected in back with water inlet line;
C, when reach set injection allocation amount and water injection well pressure be reduced to construction before water injection pressure 90% time, stop inject mixed liquor;
Described faint acid acidifying solution is: by weight percentage, its component is:
Acid solution: 10 ~ 30%;
Stabilizer: 2 ~ 8%;
Corrosion inhibiter: 1 ~ 5%;
Surfactant: 6.5 ~ 17%;
Surplus is distilled water.
After step c, also has Step d: back with water inlet line is adjusted to normal charging state.
Described back with water inlet line is water injection well clematis stem well head.
Faint acid acidifying solution and the mixed merga pass drop injection mode of injection water are injected in back with water inlet line by described a step and b step by faint acid acidifying solution skid-mounted device.
Described faint acid acidifying solution skid-mounted device is the high-pressure plunger pump (EATON-VICKERS Eton Vickers's PFB5 plunger displacement pump) to embody ball-and-seat performance.
Consisting of of described acid solution: component A: succinic acid; B component: one or more the combination in any in PBTCA, HPAA, BHMTPMPA or HDTMPA; With the weight percent meter in acidifying solution, component A accounts for 5 ~ 10%, and B component accounts for 5 ~ 20%.
Described stabilizer is made up of citric acid and ascorbic acid, and with the weight percent meter in acidifying solution, citric acid percentage by weight is 1 ~ 3%; Ascorbic acid percentage by weight is 1 ~ 5%.
Described corrosion inhibiter is propilolic alcohol.
Described surfactant is made up of alcohol ether carboxylate, OPEO and fluorocarbon surfactant, with the weight percent meter in acidifying solution, alcohol ether carboxylate percentage by weight is 5 ~ 10%, OPEO percentage by weight is 1 ~ 5%, and fluorocarbon surfactant percentage by weight is 0.5 ~ 2%.
Described fluorocarbon surfactant can select the SR18Y fluorocarbon surfactant that Shaanxi Sen Rui Science and Technology Ltd. produces.
Described PBTCA is 2-phosphate-1; 2; 4-butane tricarboxylate; described HPAA is 2-HPAA; described BHMTPMPA is double; two 1; 6-hexamethylene triamine five methylenephosphonic acid, described HDTMPA is hexapotassium, and the calm and peaceful water in Shandong all can be adopted to process the product that company limited produces.
Compared with prior art, beneficial effects of the present invention shows:
One, adopt tri-steps of abc of the present invention to carry out fixed tubular column acidifying increasing injection technique, expand water injection well acidifying plug removal radius, alleviate water injection well near wellbore fouling, extend water injection well effect duration;Achieve the continuous mixture acidifying of fixed tubular column, simplify working procedure; Water filling acidifying is synchronously performed and does not affect well and normally produce. And be in particular in:
1, decrease tubing string in fracturing work process and remove number of times, simplify working procedure, save construction operation cost;
2, operation period consuming time correspondence oil-well strata decreasing energy is decreased;
3, acidifying solution adopts point to be instilled into water injection well to make water filling acidifying be synchronously performed not affect well and normally produce.
Two, in this process, specific selection " acid solution: 10 ~ 30%; Stabilizer: 2 ~ 8%; Corrosion inhibiter: 1 ~ 5%; Surfactant: 6.5 ~ 17%; Surplus is distilled water " proportioning of such special ratios, the water injection well fixed tubular column faint acid acidifying solution of formation has good surface and interface tension force and rock core displacement performance, has certain inhibition and corrosion performance.
Three, this technique achieves the releasing of oil field sandstone oil reservoir injection well nearly pit shaft (0m ~ 3m) fouling and clogging, also can release pit shaft 3m ~ 30m fouling and clogging simultaneously, expands water injection well acidifying plug removal radius, alleviates water injection well near wellbore fouling, extends water injection well effect duration; Achieve the continuous mixture acidifying of fixed tubular column, simplify working procedure; Water filling acidifying is synchronously performed and does not affect well and normally produce; Water injection well is played de-plugging increasing injection purpose.
Four, one or several in succinic acid of the present invention and (PBTCA, HPAA, BHMTPMPA, HDTMPA) can slowly dissolve deep fouling and clogging thing, and can delay reservoir secondary fouling and clogging, delays water injection well pressure rapid increase; Reservoir rock, blocking dirt and oil pipe corrosion are produced metal ion by citric acid and ascorbic acid energy chelating acid solution, it is suppressed that acid sludge produces; Fluorocarbon surfactant can reduce faint acid acidifying solution diagram of system surface tension; Alcohol ether carboxylate (AEC-9), OPEO and fluorocarbon surfactant can reduce faint acid acidifying solution energy interfacial tension under synergism.
Detailed description of the invention
Embodiment 1
As the preferred forms of the present invention, the invention discloses a kind of water injection well fixed tubular column acidifying increasing injection process, its step is as follows:
A, with volume basis, take faint acid acidifying solution 0.3～3 part with injection 99.7～97 parts of water mix;
B, by drop injection mode, mixed liquor is injected in back with water inlet line;
C, when reach set injection allocation amount and water injection well pressure be reduced to construction before water injection pressure 90% time, stop inject mixed liquor;
Described faint acid acidifying solution is: by weight percentage, its component is:
Acid solution: 10 ~ 30%;
Stabilizer: 2 ~ 8%;
Corrosion inhibiter: 1 ~ 5%;
Surfactant: 6.5 ~ 17%;
Surplus is distilled water.
Described acid solution is one or several in succinic acid and (PBTCA, HPAA, BHMTPMPA, HDTMPA), wherein, succinic acid percentage by weight is 5 ~ 10%, one or several weight summation percentage ratios in (PBTCA, HPAA, BHMTPMPA, HDTMPA) are 5 ~ 20%, and (PBTCA, HPAA, BHMTPMPA, HDTMPA) is the calm and peaceful water in Shandong and processes company limited's production. Described stabilizer is citric acid and ascorbic acid, and wherein, citric acid percentage by weight is 1 ~ 3%; Ascorbic acid percentage by weight is 1 ~ 5%. Described corrosion inhibiter is its percentage by weight of propilolic alcohol is 1 ~ 5%. Described surfactant is alcohol ether carboxylate (AEC-9), OPEO and fluorocarbon surfactant, wherein, alcohol ether carboxylate (AEC-9) percentage by weight is 5 ~ 10%, OPEO percentage by weight is 1 ~ 5%, fluorocarbon surfactant percentage by weight is 0.5 ~ 2%, and fluorocarbon surfactant is the SR18Y fluorocarbon surfactant that Shaanxi Sen Rui Science and Technology Ltd. produces.
Certainly, this example can also adopt other faint acid acidifying solutions of the prior art.
The on-the-spot application example of the embodiment 2-present invention
The first step: fixed tubular column acidifying solution material and corollary equipment are carried to on-the-spot corresponding water injection well and specify position;
Second step: add fixed tubular column acidifying solution material in faint acid acidifying solution skid-mounted device;
3rd step: to water injection well closing well 0.5 hour, then open wellhead of water injection well anti-flushing well gate and carry out anti-flushing well, the well-flushing water yield arrives after after a well holds and closes all water injection well all gates of clematis stem well head.
4th step: be connected to inject in water injection well clematis stem well head (back with water inlet line) by faint acid acidifying solution skid-mounted device.
5th step: water injection well clematis stem head valve is adjusted to normal charging state.
6th step: open faint acid acidifying solution skid-mounted device switch, adjust faint acid acidifying solution skid-mounted device switch ratio, make faint acid acidifying solution be injected in water injection well clematis stem well head (back with water inlet line) with injecting hydromining drop wise fashion by faint acid acidifying solution skid-mounted device with 3%.
7th step: water injection well is at construction period water filling natural law 62 days, water filling every day 30m altogether3/ sky, injects faint acid acidifying solution 1860m3, water injection well reaches injection allocation amount and water injection well Pressure Drop be low to moderate water injection pressure before construction 90% time, stop note faint acid acidifying solution skid-mounted device and faint acid acidifying solution;
8th step: by the water injection well all valve closings of clematis stem well head, removes faint acid acidifying solution skid-mounted device connector, water injection well clematis stem head valve is adjusted to normal charging state.
The another on-the-spot application example of the embodiment 3-present invention
The first step: fixed tubular column acidifying solution material and corollary equipment are carried to on-the-spot corresponding water injection well and specify position;
Second step: to water injection well closing well 0.5 hour, with 350 type well-washing truck water injection well anti-flushing wells, the well-flushing water yield arrives after after a well holds and closes all water injection well all gates of clematis stem well head.
3rd step: add fixed tubular column acidifying solution material in faint acid acidifying solution skid-mounted device, is connected to inject in water injection well clematis stem well head (back with water inlet line) by faint acid acidifying solution skid-mounted device.
4th step: water injection well clematis stem head valve is adjusted to normal charging state.
5th step: open faint acid acidifying solution skid-mounted device switch, adjust faint acid acidifying solution skid-mounted device switch ratio, make faint acid acidifying solution be injected in water injection well clematis stem well head (back with water inlet line) with injecting hydromining drop wise fashion by faint acid acidifying solution skid-mounted device with 0.3%.
6th step: water injection well is at construction period water filling natural law 88 days, water filling every day 25m altogether3/ sky, injects faint acid acidifying solution 2200m3, when water injection well arrival injection allocation amount water injection well pressure reduce the 90% of the front water injection pressure of construction, stop noting faint acid acidifying solution skid-mounted device and faint acid acidifying solution;
7th step: by the water injection well all valve closings of clematis stem well head, removes faint acid acidifying solution skid-mounted device connector, water injection well clematis stem head valve is adjusted to normal charging state.
Claims (5)
1. a water injection well fixed tubular column acidifying increasing injection process, it is characterised in that step is as follows:
A, with volume basis, take faint acid acidifying solution 0.3～3 part with injection 99.7～97 parts of water mix;
B, by drop injection mode, mixed liquor is injected in back with water inlet line;
C, when reach set injection allocation amount and water injection well pressure be reduced to construction before water injection pressure 90% time, stop inject mixed liquor;
Described faint acid acidifying solution is: by weight percentage, its component is:
Acid solution: 10 ~ 30%;
Stabilizer: 2 ~ 8%;
Corrosion inhibiter: 1 ~ 5%;
Surfactant: 6.5 ~ 17%;
Surplus is distilled water;
Consisting of of described acid solution: component A: succinic acid; B component: one or more the combination in any in PBTCA, HPAA, BHMTPMPA or HDTMPA; With the weight percent meter in acidifying solution, component A accounts for 5 ~ 10%, and B component accounts for 5 ~ 20%;
Described stabilizer is made up of citric acid and ascorbic acid, and with the weight percent meter in acidifying solution, citric acid percentage by weight is 1 ~ 3%; Ascorbic acid percentage by weight is 1 ~ 5%;
Described corrosion inhibiter is propilolic alcohol;
Described surfactant is made up of alcohol ether carboxylate, OPEO and fluorocarbon surfactant, with the weight percent meter in acidifying solution, alcohol ether carboxylate percentage by weight is 5 ~ 10%, OPEO percentage by weight is 1 ~ 5%, and fluorocarbon surfactant percentage by weight is 0.5 ~ 2%.
2. water injection well fixed tubular column acidifying increasing injection process according to claim 1, it is characterised in that: after step c, also have Step d: back with water inlet line is adjusted to normal charging state.
3. water injection well fixed tubular column acidifying increasing injection process according to claim 1 and 2, it is characterised in that: described back with water inlet line is water injection well clematis stem well head.
4. water injection well fixed tubular column acidifying increasing injection process according to claim 3, it is characterised in that: faint acid acidifying solution and the mixed merga pass drop injection mode of injection water are injected in back with water inlet line by described a step and b step by faint acid acidifying solution skid-mounted device.
5. water injection well fixed tubular column acidifying increasing injection process according to claim 4, it is characterised in that: described faint acid acidifying solution skid-mounted device is the high-pressure plunger pump to embody ball-and-seat performance.
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| CN105735962A (en) * | 2016-01-30 | 2016-07-06 | 山东省鲁南地质工程勘察院 | Paleozoic carbonate heat storage reservoir chemical fracturing well flushing technique |
| CN105952431B (en) * | 2016-04-21 | 2018-08-10 | 中国石油天然气股份有限公司 | Fixed tubular column method for removing blockage |
| CN108775236B (en) * | 2018-08-15 | 2020-06-26 | 宁夏朔光石油科技有限公司 | Pressure-reducing and injection-increasing process method for water injection well and application thereof |
| CN111502598A (en) * | 2019-01-31 | 2020-08-07 | 中国石油天然气股份有限公司 | Acidification blockage removing method |
| CN110410048B (en) * | 2019-07-02 | 2022-03-29 | 中国石油天然气股份有限公司 | Method for prolonging acidification validity period |
| CN110700804B (en) * | 2019-10-09 | 2022-01-04 | 中国石油天然气股份有限公司 | Method for adding antihypertensive and augmented injection medicament |
| CN114856514A (en) * | 2021-02-03 | 2022-08-05 | 中国石油天然气股份有限公司 | Water injection device and method for water injection well |
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| CN1526913A (en) * | 2003-03-07 | 2004-09-08 | 群 里 | Oil field oil-water well unblocking and injection increasing method and the apparatus for implementing the same method |
| CN102828734A (en) * | 2012-09-13 | 2012-12-19 | 西南石油大学 | Offshore oilfield water injection well online one-step-process acidification technology |
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| GB0711342D0 (en) * | 2007-06-12 | 2007-07-25 | Champion Technologies Ltd | Well treatment |
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| CN1526913A (en) * | 2003-03-07 | 2004-09-08 | 群 里 | Oil field oil-water well unblocking and injection increasing method and the apparatus for implementing the same method |
| CN102828734A (en) * | 2012-09-13 | 2012-12-19 | 西南石油大学 | Offshore oilfield water injection well online one-step-process acidification technology |
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Effective date of registration: 20201117 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: The 1 section of No. 3 company Chuanqing Drilling Technology Information Office Chenghua District Green Road 610051 Chengdu City, Sichuan Province Patentee before: CNPC Chuanqing Drilling Engineering Co.,Ltd. |