CN106246156B - A kind of explosion fracturing acidification connection makees method - Google Patents
A kind of explosion fracturing acidification connection makees method Download PDFInfo
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- CN106246156B CN106246156B CN201610712207.0A CN201610712207A CN106246156B CN 106246156 B CN106246156 B CN 106246156B CN 201610712207 A CN201610712207 A CN 201610712207A CN 106246156 B CN106246156 B CN 106246156B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention discloses a kind of explosion fracturing acidification connection to make method, this method includes explosion fracturing acidification combination operation process parameter optimization, operation preparation and pit shaft fill liquid before explosion fracturing, formation testing uptake before explosion fracturing, tripping in explosion fracturing working string is to predetermined operation depth, tubing string pressurization detonation, kill-job operation, play detonation fracturing work tubing string, formation testing uptake after explosion fracturing, tripping in acidizing treatment tubing string, pump acid filling liquid slug, play acidizing treatment tubing string, tripping in electric pump flow string and electric pump drain and well head add alkali neutralization, under without Y block up electric pump produce Y tubing string, pump acid filling liquid slug, it is stifled to throw Y, electric pump drain and well head add alkali neutralization.Its advantage is that: explosion fracturing and acidizing effect can be further enhanced, acid solution injectability is enhanced, expands acidizing radius, and further prevent crack closure, enhances physical effect；The effect of explosion fracturing can be enhanced, flexible choice postorder acidification step can save job step while guaranteeing operation effectiveness.
Description
Technical field
The present invention relates to oil gas field formation acidizing fracture technology fields, more particularly, it relates to the technology
A kind of explosion fracturing acidification connection in field makees method.
Background technique
Explosion fracturing is also known as high enegry gas fracturing, is to generate high temperature and high pressure gas pair using gunpowder or propellant combustion
Stratum carries out a technological means of pressure break, and Acidizing Technology is also a common technological means in oilfield stimulation measure.
Currently, oil field at home by explosion fracturing and acidification be combined connection make, i.e., with physics and chemistry complex method into
Row volume increase.Physics, that is, explosion fracturing, it can make stratum form radial multiple cracking oil flow channel, enhance acid solution injectability, expand
Big acidizing radius；Chemistry is acidified, and can release nearly well plugging, links up infiltration lane, further prevents crack closure, enhances physics
Effect.Such as Eastern South China Sea Lufeng oil field, Nanyang, henan oil extraction No.1 Factory, Changqing oilfields oil extraction No.1 Factory, the oil recovery of Liaohe Oil Field Shenyang
Factory, Sichuan Petroleum Administration river southwest mine and river Nan Kuang once carried out explosion fracturing and are acidified integration of operation, achieved generally acknowledged ratio
The far better geological effect of single acidizing effect.
The patent of invention of Publication No. CN1182166A discloses " a kind of efficient gas pressure-cracking method ", and this method is using solid
Body acid fuel acidifier, explosion fracturing and acidification are combined, HCl is mainly released to, and are suitable for Carbonate Reservoir or complete well is dirty
Operation when contaminating serious.The utility model patent of Publication No. CN200975241Y discloses " a kind of Gas impelling Sewing Device ",
It simply outlines the device and combines action function with perforation, acidification, gas pressure break, since the implementation of the technology is using same
Casing string carries out, therefore quickly the row of returning acts on after not having the acidification of electric pump flow string.The invention of Publication No. CN101113669A
Patent disclosure " a kind of fracturing process for improving low permeability reservoir production capacity ", this method is mainly used for improving low permeability reservoir production capacity, can
It is effectively combined by high enegry gas fracturing and acidic fracturing fluid, diversion agent, acid solution etc., enhances conventional fracturing effect, do not had suitable
Answering property and flexibility.
In conclusion so far, the country still lacks one kind and is suitable for electric pump flow string, sandstone and carbonate reservoir
And the explosion fracturing connection of postorder acidizing treatment can be selected to make method according to explosion fracturing situation.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, and provide a kind of explosion fracturing acidification connection work side thus
Method, to expand the scope of application of explosion fracturing acidification combined tech.
The technical scheme is that
A kind of explosion fracturing acidification connection makees method, comprising the following steps:
(1) explosion fracturing is acidified combination operation process parameter optimization:
The process parameter optimizing includes the design of explosion fracturing gunpowder dosage, the design of explosion fracturing working string, acid solution
Slug design, the design of acid solution treatment radius, acidizing treatment pressure and discharge capacity design, acidizing treatment design of string pipe；
(2) operation prepares before explosion fracturing, and pit shaft fills liquid:
Operation prepares including preparing enough working spaces, being equipped with fire-fighting equipment, former well life before the explosion fracturing
Tubing string, drifting, scraping, well-flushing, testing pressure of well head, preparation work equipment and accessory work are produced, the liquid is that water or KCl are water-soluble
Liquid；
(3) formation testing uptake before explosion fracturing；
The formation testing uptake is under the conditions of oil well pressure limiting, and liquid pump infuses speed before testing explosion fracturing；
(4) tripping in explosion fracturing working string is to predetermined operation depth:
The predetermined operation depth is explosion fracturing operation well section；
(5) tubing string pressurization detonation:
The pressurization detonation carries out explosion fracturing detonation operation to suppress by liquid；
(6) kill-job operation；
(7) detonation fracturing work tubing string is played；
(8) formation testing uptake after explosion fracturing:
The formation absorption amount is that liquid pump infuses speed after explosion fracturing under the conditions of oil well pressure limiting；
In (8) step:
If calculated according to formation absorption amount after explosion fracturing, it is contemplated that being acidified total liquid measure pump note time is more than 3 hours, then holds
Row step:
(9) tripping in acidizing treatment tubing string；
(10) acid filling liquid slug is pumped:
The acid solution slug includes and is not limited to prepad fluid, main acid, after pad and displacement fluid；
(11) kill-job operation；
(12) acidizing treatment tubing string is played；
(13) tripping in electric pump flow string, electric pump drain, well head add alkali neutralization:
The electric pump flow string includes electric pump production Y tubing string, electric pump production straight tube post；
In (8) step:
If calculated according to formation absorption amount after explosion fracturing, it is contemplated that be acidified total liquid measure pump note time within 3 hours, then
Execute step:
(9) Y tubing string is produced without the electric pump that Y is blocked up under；
(10) acid filling liquid slug is pumped；
(11) it is stifled to throw Y:
The Y blocks up to block the tool of oil pipe operation path, is dropped in blanking plug seat；
(12) electric pump drain, well head add alkali neutralization.
In in above method:
The gunpowder dosage that the explosion fracturing gunpowder dosage design uses are as follows: the surge pressure P generated in the earth formationPeak=
(1.1~2.0) × PIt is broken, and PPeak-PIt is broken< PSet is anti-, in which: PIt is brokenFor formation fracture pressure, PSet is anti-For the anti-internal pressure value of casing.
The acid solution slug design includes and is not limited to prepad fluid, main acid, after pad and displacement fluid；
The group of the prepad fluid and after pad become 5-15%HCl, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% iron from
Sub- stabilizer, surplus are water；
The group of the displacement fluid becomes 1-2% expansion-resisting agent, and surplus is water.
There are three types of building forms for the main acid:
1,5-15%HCl, 5-10%HBF4, 10-30%H2SiF6, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% iron from
Sub- stabilizer, 6-8% precipitating inhibitor, surplus are water；
2,10-30%HCl, 1-15% thickening agent, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% ferrous stability,
Surplus is water；
3,10-30%HCl, 2-10% diversion agent, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% ferrous stability,
Surplus is water；
The main acid of 1st kind of building form is used for sandstone reservoir；
2nd kind and ground 3 kinds of building forms main acid be used for carbonate reservoir.
It is described " formation absorption amount calculates after explosion fracturing, it is contemplated that be acidified total liquid measure pump note time be more than 3 hours or more or
Within 3 hours ", refer to after not considering to pump acid filling in the increased situation of discharge capacity, with the total liquid measure of acidification divided by test detonation pressure
Splitting the rear liquid pump note speed resulting time is more than 3 hours or within 3 hours.
The present invention overcomes many deficiencies of the prior art, the beneficial effect is that:
(1) being suitable for the operation of electric pump flow string, (electric pump flow string is the important composition portion that artificial lift is recovered the oil
Point), it is particularly suitable for offshore oilfield operation；
(2) it is adapted to sandstone and carbonate reservoir operation, while being suitable for organic plugging de-plugging；
(3) explosion fracturing and acidizing effect can be further enhanced, it is radial that explosion fracturing therein can be such that stratum is formed
Multiple cracking oil flow channel enhances acid solution injectability, expands acidizing radius；Acidification therein can release nearly well plugging, link up and seep
Saturating channel further prevents crack closure, enhances physical effect；
(4) acidizing treatment pressure can be further promoted to close to packer pressure limiting, be conducive to acidification and made up explosion fracturing work
Industry effect；If formation absorption amount increases ideal after explosion fracturing, acidizing treatment is carried out using electric pump production Y tubing string, can be saved
Kill-job operation and acidification tubing string operation procedure is removed, lowers a kill-job operation to formation damage, while acidification can release
A preceding kill-job operation is to formation damage, and in addition acidification can also be achieved the quick row of returning；
(5) effect that can enhance explosion fracturing passes through the further kluftkarren of acid solution and releases near wellbore zone contamination and plugging,
It is not only suitable for electric pump flow string operation, and is adapted to sandstone and carbonate reservoir operation, the acidification of flexible choice postorder
Step can save job step while guaranteeing operation effectiveness.
Detailed description of the invention
Fig. 1 is workflow schematic diagram of the invention.
Fig. 2 is the oil field LF13-1 26H well explosion fracturing tubing string schematic diagram.
Fig. 3 is the oil field LF13-1 26H well acidizing tubing string schematic diagram.
Fig. 4 is 6 depth well pump of the oil field LF13-1 production Y tubing string schematic diagram.
Fig. 5 is 6 depth well pump of the oil field LF13-1 production straight tube post schematic diagram.
Fig. 6 is acidizing treatment curve graph after the 26H well explosion fracturing of the Lufeng oil field 13-1.
Fig. 7 is acidizing treatment curve graph after 6 well explosion fracturing of the Lufeng oil field 13-1.
Specific embodiment
To make the present invention be easier to be understood, below in conjunction with drawings and examples to technical solution of the present invention and its
Technical effect is explained in detail.
A kind of explosion fracturing acidification connection of the invention makees method, comprising the following steps:
(1) explosion fracturing is acidified combination operation process parameter optimization:
The process parameter optimizing includes the design of explosion fracturing gunpowder dosage, the design of explosion fracturing working string, acid solution
Slug design, the design of acid solution treatment radius, acidizing treatment pressure and discharge capacity design, acidizing treatment design of string pipe；
(2) operation prepares before explosion fracturing, and pit shaft fills liquid:
Operation prepares including preparing enough working spaces, being equipped with fire-fighting equipment, former well life before the explosion fracturing
Tubing string, drifting, scraping, well-flushing, testing pressure of well head, preparation work equipment and accessory work are produced, the liquid is that water or KCl are water-soluble
Liquid；
(3) formation testing uptake before explosion fracturing；
The formation testing uptake is under the conditions of oil well pressure limiting, and liquid pump infuses speed before testing explosion fracturing.
(4) tripping in explosion fracturing working string is to predetermined operation depth:
The predetermined operation depth is explosion fracturing operation well section；
(5) tubing string pressurization detonation:
The pressurization detonation carries out explosion fracturing detonation operation to suppress by liquid；
(6) kill-job operation；
(7) detonation fracturing work tubing string is played；
(8) formation testing uptake after explosion fracturing:
The formation absorption amount is that liquid pump infuses speed after explosion fracturing under the conditions of oil well pressure limiting；
In (8) step:
If calculated according to formation absorption amount after explosion fracturing, it is contemplated that being acidified total liquid measure pump note time is more than 3 hours, then holds
Row step:
(9) tripping in acidizing treatment tubing string；
(10) acid filling liquid slug is pumped:
The acid solution slug includes and is not limited to prepad fluid, main acid, after pad and displacement fluid；
(11) kill-job operation；
(12) acidizing treatment tubing string is played；
(13) tripping in electric pump flow string, electric pump drain, well head add alkali neutralization:
The electric pump flow string includes electric pump production Y tubing string shown in Fig. 4 and electric pump shown in fig. 5 production straight tube
Column.
In (8) step:
If calculated according to formation absorption amount after explosion fracturing, it is contemplated that be acidified total liquid measure pump note time within 3 hours, then
Execute step:
(9) Y tubing string is produced without the electric pump that Y is blocked up under；
(10) acid filling liquid slug is pumped；
(11) it is stifled to throw Y:
The Y blocks up to block the tool of oil pipe operation path, is dropped in blanking plug seat；
(12) electric pump drain, well head add alkali neutralization.
In aforementioned step (1):
The explosion fracturing working string is designed as the tools such as drilling rod or heavy wall tubing, damper, initiator, bear gun
Combination.
The gunpowder dosage that the explosion fracturing gunpowder dosage design uses are as follows: the surge pressure P generated in the earth formationPeak=
(1.1~2.0) × PIt is broken, and PPeak-PIt is broken< PSet is anti-, in which: PIt is brokenFor formation fracture pressure, PSet is anti-For the anti-internal pressure value of casing.
The acid solution slug design includes and is not limited to prepad fluid, main acid, after pad and displacement fluid；
The group of the prepad fluid and after pad become 5-15%HCl, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% iron from
Sub- stabilizer, surplus are water；
The group of the displacement fluid becomes 1-2% expansion-resisting agent, and surplus is water.
There are three types of building forms for the main acid:
1,5-15%HCl, 5-10%HBF4, 10-30%H2SiF6, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% iron from
Sub- stabilizer, 6-8% precipitating inhibitor, surplus are water；
2,10-30%HCl, 1-15% thickening agent, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% ferrous stability,
Surplus is water；
3,10-30%HCl, 2-10% diversion agent, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% ferrous stability,
Surplus is water；
The main acid of 1st kind of building form is used for sandstone reservoir；
The main acid of 2nd kind and the 3rd kind building form is used for carbonate reservoir.
The acid solution treatment radius is designed as 0.5-2m；
The acidizing treatment pressure P≤η × PIt is broken+Pf-Ph, in which: η is safety coefficient, is 0.8-0.9, PIt is brokenIt is broken for stratum
Split pressure, PfFor frictional resistance, PhFor head of liquid；
The operational discharge capacity 0.1-1.5m3/ min, when limiting operation pressure, discharge capacity is lifted up as far as possible；
The acidizing treatment design of string pipe is the combination of the tools such as drilling rod or heavy wall tubing, packer, sliding sleeve.
In aforementioned step (10):
The acid solution slug includes and is not limited to prepad fluid, main acid, after pad and displacement fluid, and referring to has according to stratum
Machine stopping state, increases organic cleaning fluid before prepad fluid.
The organic cleaning fluid is dimethylbenzene, diesel oil, 0.05-0.2%FC4430 fluorocarbon surfactant or 50-70%
The compound hydrocarbon of polyoxyethylene fatty amine；
" formation absorption amount calculates after explosion fracturing, it is contemplated that it is super to be acidified total liquid measure pump note time described in abovementioned steps (8)
Spend 3 hours " or " formation absorption amount calculates after explosion fracturing, it is contemplated that is acidified total liquid measure pump note time within 3 hours ", refer to not
After consideration pump acid filling in the increased situation of discharge capacity, speed gained is infused divided by liquid pump after test explosion fracturing with total liquid measure is acidified
Time be more than 3 hours or within 3 hours.
Electric pump production Y tubing string, electric pump production straight tube post in abovementioned steps (13) are two kinds of oil well production strings, and electric pump is raw
It produces in the oil pipe of Y tubing string if stifled without Y, oil pipe can be kept unimpeded, implement acidizing treatment, if investment Y is stifled, block oil pipe
Operation path carries out electric pump and returns the residual acid of row and production.
Embodiment 1:
It is institute that the explosion fracturing acidification connection of the oil field LF13-1 26H well, which applies explosion fracturing tubing string and Fig. 3 shown in Fig. 2,
The acidification tubing string shown.
Explosion fracturing gunpowder dosage described in step (1) is 40kg, and the surge pressure generated through simulation 40kg is
60MPa, the well formation fracture pressure are 45.5MPa, and surge pressure is 1.3 times of formation fracture pressures, and the anti-internal pressure of the casing is
47.3MPa meets PPeak-PIt is broken< PSet is anti-；It is as shown in table 1 to be acidified slug.
1 oil field LF13-1 26H well acid solution slug scale of table
Acid solution treatment radius is designed as 1.3m；Acidizing treatment pressure P≤16MPa；Operational discharge capacity 0.1-1.5m3/ min,
In the case of limiting operation pressure, discharge capacity is lifted up as far as possible；Acidizing treatment design of string pipe is shown in Fig. 5.
Acid solution slug described in step (10) includes prepad fluid, main acid, after pad and displacement fluid, they are respectively as follows:
Prepad fluid and after pad group become 5-15%HCl, 1-2%HSJ corrosion inhibiter, 1-2%FP-02 expansion-resisting agent, 1-2%
TL-01 ferrous stability, surplus are water；
Main acid group becomes 5-15%HCl, 5-10%HBF4, 10-30%H2SiF6, 1-2%HJS corrosion inhibiter, 1-2%FP-
02 expansion-resisting agent, 1-2%TL-01 ferrous stability, 6-8%FCY-06 precipitating inhibitor, surplus are water；
Displacement fluid group becomes 1-2%FP-02 expansion-resisting agent, and surplus is water.
" formation testing uptake after explosion fracturing, it is contemplated that being acidified total liquid measure pump note time is more than 3 small in step (8)
When " or " formation testing uptake after explosion fracturing, it is contemplated that be acidified total liquid measure pump note time within 3 hours " --- 26H
Formation absorption amount is 0.69bpm@2300psi before well explosion fracturing；Formation absorption amount is 1.3bpm@2300psi after explosion fracturing；
Being acidified total liquid measure is 29m3, i.e. 182.4bbl, it is contemplated that being acidified total liquid measure pump note time is that 182.4 ÷, 1.3 ÷, 60 ≈ 2.3 is small
When, therefore tripping in electric pump production Y tubing string is used to be acidified mode.
The embodiment explosion fracturing and acidification integration of operation effect are as shown in fig. 6, formation absorption amount is before explosion fracturing
0.69bpm@2300psi；Formation absorption amount is 1.3bpm@2300psi after explosion fracturing；Formation absorption amount is after acidification
2.0bpm@2300psi, formation absorption amount is before 2.9 times, significant effect.
Liquid output is 65bpd before the well operations, and Liquid output reaches 752bpd after operation, 11.6 before being times, adds up to increase
Oily 0.16 ten thousand sides, connection make implementation significant effect.
Embodiment 2:
The explosion fracturing acidification connection of 6 well of the oil field LF13-1 applies straight tube post described in Y tubing string and Fig. 5 described in Fig. 4.
Explosion fracturing gunpowder dosage described in step (1) is 20kg, and the surge pressure generated through simulation 20kg is
50.2MPa, the well formation fracture pressure are 44.6MPa, and surge pressure is 1.1 times of formation fracture pressures, the anti-internal pressure of the casing
For 56.2MPa, meet PPeak-PIt is broken< PSet is anti-；It is as shown in table 2 to be acidified slug.
2 oil field LF13-1 of table, 6 well acid solution slug scale
Acid solution treatment radius is designed as 2.0m；Acidizing treatment pressure P≤15.86MPa；Operational discharge capacity 0.1-1.5m3/ min,
When limiting operation pressure, discharge capacity is lifted up as far as possible.
Acid solution slug described in step (10) includes prepad fluid, main acid, after pad and displacement fluid, they are respectively as follows:
Prepad fluid and after pad group become 5-15%HCl, 1-2%HSJ corrosion inhibiter, 1-2%FP-02 expansion-resisting agent, 1-2%
TL-01 ferrous stability, surplus are water；
Main acid group becomes 5-15%HCl, 5-10%HBF4, 10-30%H2SiF6, 1-2%HJS corrosion inhibiter, 1-2%FP-
02 expansion-resisting agent, 1-2%TL-01 ferrous stability, 6-8%FCY-06 precipitating inhibitor, surplus are water；
Displacement fluid group becomes 1-2%FP-02 expansion-resisting agent, and surplus is water.
The medicament is provided by Tianjin Tiancheng Chemical Co., Ltd..
" formation testing uptake after explosion fracturing, it is contemplated that being acidified total liquid measure pump note time is more than 3 small in step (8)
When " or " formation absorption amount calculates after explosion fracturing, it is contemplated that is acidified total liquid measure pump note time within 3 hours " --- 6 well detonations
Formation absorption amount is 0.5bpm@1500psi before pressure break；Formation absorption amount is 1.72bpm@1500psi after explosion fracturing, and acidification is total
Liquid measure is 60m3, i.e. 377.34bbl, it is contemplated that being acidified total liquid measure pump note time is 377.34 ÷, 1.72 ÷, 60 ≈ 3.7 hours,
Therefore mode is acidified using tripping in acidification tubing string.
The embodiment explosion fracturing and acidification integration of operation effect are as shown in fig. 7, formation absorption amount is before explosion fracturing
0.5bpm@1500psi；Formation absorption amount is 1.72bpm@2300psi after explosion fracturing；Formation absorption amount is after acidification
5.83bpm@2300psi, formation absorption amount is before 11.7 times, significant effect.
It is calculated with individual well, Liquid output is 779bpd before integration of operation, and Liquid output reaches 1858bpd after integration of operation, for it
Preceding 2.4 times increase oily 1.55 ten thousand sides from May, 2015 to 1 month to date in 2016, and it is significant that connection makees method implementation result.
Schematic description of the technical scheme of the invention is schematically described in conjunction with the accompanying drawings and embodiments above, but the present invention not office
It is limited to above-mentioned specific embodiment.It will be apparent to an ordinarily skilled person in the art that in practical applications, it is each in the present invention
The specific embodiment of step is likely to occur certain changes, and other staff may also dream up similar skill under its enlightenment
Art scheme.In particular, it should be pointed out that as long as it does not depart from the design purpose of the present invention, all obvious changes include
Within protection scope of the present invention.
Claims (6)
1. a kind of explosion fracturing acidification connection makees method, it is characterised in that: method includes the following steps:
(1) explosion fracturing is acidified combination operation process parameter optimization:
The process parameter optimizing includes the design of explosion fracturing gunpowder dosage, the design of explosion fracturing working string, acid solution slug
Design, the design of acid solution treatment radius, acidizing treatment pressure and discharge capacity design, acidizing treatment design of string pipe；
(2) operation prepares before explosion fracturing, and pit shaft fills liquid:
Operation prepares to include preparing enough working spaces, being equipped with fire-fighting equipment, play former well production pipe before the explosion fracturing
Column, drifting, scraping, well-flushing, testing pressure of well head, preparation work equipment and accessory work, the liquid are water or KCl aqueous solution；
(3) formation testing uptake before explosion fracturing:
The formation testing uptake is under the conditions of oil well pressure limiting, and liquid pump infuses speed before testing explosion fracturing；
(4) tripping in explosion fracturing working string is to predetermined operation depth:
The predetermined operation depth is explosion fracturing operation well section；
(5) tubing string pressurization detonation:
The pressurization detonation carries out explosion fracturing detonation operation to suppress by liquid；
(6) kill-job operation；
(7) detonation fracturing work tubing string is played；
(8) formation testing uptake after explosion fracturing:
The formation absorption amount is that liquid pump infuses speed after explosion fracturing under the conditions of oil well pressure limiting；
In (8) step:
If calculated according to formation absorption amount after explosion fracturing, it is contemplated that being acidified total liquid measure pump note time is more than 3 hours, then executes step
It is rapid:
(9) tripping in acidizing treatment tubing string；
(10) acid filling liquid slug is pumped；
(11) kill-job operation；
(12) acidizing treatment tubing string is played；
(13) tripping in electric pump flow string, electric pump drain, well head add alkali neutralization:
The electric pump flow string includes electric pump production Y tubing string, electric pump production straight tube post；
In (8) step:
If calculated according to formation absorption amount after explosion fracturing, it is contemplated that be acidified total liquid measure pump note time within 3 hours, then execute
Step:
(9) Y tubing string is produced without the electric pump that Y is blocked up under；
(10) acid filling liquid slug is pumped；
(11) it is stifled to throw Y:
The Y blocks up to block the tool of oil pipe operation path, is dropped in blanking plug seat；
(12) electric pump drain, well head add alkali neutralization.
2. explosion fracturing acidification connection according to claim 1 makees method, it is characterised in that: detonation described in step (1)
The gunpowder dosage that the design of pressure break gunpowder dosage uses are as follows: the surge pressure P generated in the earth formationPeak=(1.1~2.0) × PIt is broken, and
PPeak-PIt is broken< PSet is anti-, in which: PIt is brokenFor formation fracture pressure, PSet is anti-For the anti-internal pressure value of casing.
3. explosion fracturing acidification connection according to claim 1 makees method, it is characterised in that: acid solution described in step (1)
Slug design includes and is not limited to prepad fluid, main acid, after pad and displacement fluid.
4. explosion fracturing according to claim 3 acidification connection makees method, it is characterised in that: the prepad fluid and after pad
Group becomes 5-15%HCl, and 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% ferrous stability, surplus is water.
5. explosion fracturing acidification connection according to claim 3 makees method, it is characterised in that: there are three types of groups for the main acid
At mode:
(1) 5-15%HCl, 5-10%HBF4, 10-30%H2SiF6, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% iron ion
Stabilizer, 6-8% precipitating inhibitor, surplus are water；
(2) 10-30%HCl, 1-15% thickening agent, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% ferrous stability, surplus
For water；
(3) 10-30%HCl, 2-10% diversion agent, 1-2% corrosion inhibiter, 1-2% expansion-resisting agent, 1-2% ferrous stability, surplus
For water.
6. explosion fracturing acidification connection according to claim 1 makees method, it is characterised in that: " detonation described in step (8)
Formation absorption amount calculates after pressure break, it is contemplated that being acidified the total liquid measure pump note time is more than 3 hours " or " formation absorption amount after explosion fracturing
Calculate, it is contemplated that be acidified total liquid measure pump note time within 3 hours ", refer to after not considering to pump acid filling in the increased situation of discharge capacity,
It is more than 3 hours or within 3 hours with total liquid measure is acidified divided by the liquid pump note speed resulting time after test explosion fracturing.
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