CN104081000A - Method and acidizing tool for deep acid stimulation using ultrasound - Google Patents
Method and acidizing tool for deep acid stimulation using ultrasound Download PDFInfo
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- CN104081000A CN104081000A CN201280060215.1A CN201280060215A CN104081000A CN 104081000 A CN104081000 A CN 104081000A CN 201280060215 A CN201280060215 A CN 201280060215A CN 104081000 A CN104081000 A CN 104081000A
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- 238000000034 method Methods 0.000 title claims abstract description 93
- 238000002604 ultrasonography Methods 0.000 title abstract 3
- 230000000638 stimulation Effects 0.000 title abstract 2
- 230000035515 penetration Effects 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims description 33
- 230000006698 induction Effects 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 13
- 238000005187 foaming Methods 0.000 claims description 10
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 12
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- 230000035699 permeability Effects 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 238000010306 acid treatment Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 4
- 230000020477 pH reduction Effects 0.000 description 4
- 230000036632 reaction speed Effects 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
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- 239000006028 limestone Substances 0.000 description 2
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- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
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- IQVNEKKDSLOHHK-FNCQTZNRSA-N (E,E)-hydramethylnon Chemical compound N1CC(C)(C)CNC1=NN=C(/C=C/C=1C=CC(=CC=1)C(F)(F)F)\C=C\C1=CC=C(C(F)(F)F)C=C1 IQVNEKKDSLOHHK-FNCQTZNRSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
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Classifications
-
- 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
- E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
-
- 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
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
-
- 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
- E21B43/003—Vibrating earth formations
-
- 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
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
A method of deep acid stimulation for a zone to be treated in an underground formation using an acidizing tool, the method including the steps of introducing the acidizing tool into the well bore, introducing the acid formulation onto the well bore wall at the treatment zone and introducing ultrasound energy into the underground formation at the treatment zone. The subsequent acid penetration depth is deeper than the initial acid penetration depth. A method of stress fracturing a portion of an underground formation includes the steps of introducing the acidizing tool into a well bore and introducing the acid formulation and the ultrasound energy at the focused treatment point. The weakened acidized spots in combination with the stress on the underground formation causes oriented stress-induced fractures to form that are fluidly coupled with the well bore. An acidizing tool includes an acid, delivery system and an ultrasonic transmitter.
Description
Inventor: Mohammed, founder of Islam receives Bill Nu Yi-Mei Xidi
Mo Hanmode H Royal Saltworks of Arc et Senans is breathed out Supreme Being difficult to understand
Technical field
The present invention relates to a kind of method and a kind of device, penetratingly descend the length of penetration of carbonate strata by increasing acid, improve the efficiency of matrix acidifying technology.
Background technology
In order to improve in-place permeability, way is that acidification is carried out in stratum conventionally.For example, in petroleum industry, in order to improve the permeability of hydrocarbon containing layer around, can be by acidifying solution Injection Well, thus contribute to the liquid of hydrocarbon-containiproducts to flow into well from stratum.This Acidizing Technology can be implemented as " matrix acidifying " process or " acid fracturing splits " process.
In sour fracturing process, under enough pressure, acidifying solution is configured in well, to cause forming pressure break in stratum.Therefore, pass through formed pressure break, and by sour chemical reaction in stratum, realize the raising of permeability.
In matrix acidifying process, with the pressure lower than formation breakdown pressure, acidifying solution from well by entering stratum.In this case, it is mainly that the chemical reaction in stratum causes by acid that permeability increases, due to the situation that produces Mechanical Crushing as in fracturing process in stratum seldom or can not cause the increase of permeability.
In most cases, in calcareous stratum such as dolomite, limestone, dolomitic-sandstone etc., carry out acidification.But, in the process of these types of formations of acidification, there is common difficulty, reason is that the reaction speed of the ground layer segment that first contacts with it of acidifying solution is fast.In matrix acidifying processing procedure, this is especially severe.While forcing acidifying solution to enter stratum from well, acid is reacted rapidly with the calcareous material of next-door neighbour's well.Therefore, acid consumed before it can penetrate into the suitable distance in stratum.For example, in the matrix acidifying process on limestone stratum, commonly, with active acid (live acid) realize maximum permeate the degree of depth reaching apart from only several inches to one foot, pit shaft face.Certainly, this has seriously limited the raising of productivity or the injectability (injectivity) of well.
Attempt several different methods and reduced the reaction speed of acid and rock stratum.For example, other people had attempted adding reaction suppressor to acid batching.In addition, for the reaction speed that slows down, other work have taken up to pay close attention to the approach that reduces local temperature.But the solution of all these modes, all because the cost and the complexity that have increased matrix acidifying processing operation are brought wretched insufficiency.So, advantageously there is a kind of method and a kind of device, for providing improved deep acidizing, current those known methods and device strengthen.
Summary of the invention
Method of the present invention and device are provided for matrix acidifying processing, in order to realize darker enhancement region in stratum.This method promotes to strengthen acid with ultrasonic energy and deeper enters stratum.
The method strengthening for carrying out pending district, stratum deep acidizing, it uses a kind of acidifying instrument.This method comprises introduces the step that acidifying instrument enters pit shaft.Pit shaft can operate to allow to approach stratum.Pit shaft is also limited by well bore wall.Acidifying instrument can operate to introduce acid and prepare burden to well bore wall.Acidifying instrument also can operate to introduce ultrasonic energy and enter stratum.This method comprises that introducing acid prepares burden to the step for the treatment of region place well bore wall.Acid batching comprises acid.The introducing of acid batching makes acid diffuse into the stratum at treatment region place, reaches initial acid length of penetration.This method comprises introduces the step that ultrasonic energy enters stratum, treatment region place.Acid diffuses into the stratum at treatment region place, reaches follow-up sour length of penetration.Follow-up sour length of penetration is more goed deep in stratum than initial acid length of penetration.
Make a method for stratum part stress fracturing, comprise that introducing acidifying instrument enters the step that pit shaft makes it locate close to concern process points.Paying close attention to process points is associated with the ground layer segment under stress.Acidifying instrument can operate to pay close attention to process points place introducing acid batching and ultrasonic energy.This method is included in the step of paying close attention to process points place and introduce simultaneously acid batching and ultrasonic energy.This simultaneously introducing diffuses in the ground layer segment under stress the acid of preparing burden from acid.With the pressure lower than effect of stress sub-surface fracture gradient pressure, introduce acid batching.The acid of diffusion forms weak acidifying point in the stratum under stress.Stress acting in conjunction in weak acidifying point and stratum, causes forming the directional stress being connected with wellbore fluids and brings out pressure break.
At the acidifying instrument through using in the pit shaft on stratum, comprise sour induction system, this acid induction system can operate to introduce acid and prepare burden to the well bore wall of pit shaft.Acidifying instrument also comprises ultrasonic transmitter, and this ultrasonic transmitter can operate to introduce ultrasonic energy and enter stratum.
Brief description of the drawings
With reference to following specific descriptions, claims and the accompanying drawing of preferred embodiment, feature, each side and the advantage of these and other that the present invention may be better understood, in accompanying drawing:
Figure 1A～1C is being pre-formed a kind of embodiment that uses the inventive method shown in the sectional view of pit shaft, wherein uses a kind of embodiment of acidifying instrument;
Fig. 2 is being pre-formed a kind of embodiment that uses the inventive method shown in the sectional view of pit shaft, wherein uses a kind of embodiment of acidifying instrument;
Fig. 3 illustrates the sectional view of a kind of embodiment of acidifying instrument;
Fig. 4 illustrates the sectional view of a kind of embodiment of acidifying instrument;
Before Fig. 5 illustrates and is exposed on the first brill core about acid batching and latter two situation under histogram depth analysis; And
Before Fig. 6 illustrates and is exposed on the second brill core about acid batching and ultrasonic energy and latter two situation under histogram depth analysis.
In accompanying drawing, similarly inscape or feature or the two can have same or analogous Reference numeral.
Detailed description of the invention
This manual (it comprises the specific descriptions of summary of the invention, Brief Description Of Drawings and preferred embodiment) and claims, relate to exclusive feature of the present invention (comprising the step of process or method).It will be appreciated by those skilled in the art that the present invention includes only characteristic described in manual likely combines and apply.It will be appreciated by those skilled in the art that the present invention is not limited to the description of embodiment given in manual, is not also limited.Theme of the present invention does not limit, as long as it does not depart from the spiritual scope of manual and claims.
Those skilled in the art it is also understood that the term that description specific implementations is used does not limit the scope of the invention or width.In the process of book and claims of explaining, all terms should be explained by the widest possible mode consistent with each term context.Unless otherwise defined, all technology that use in this manual and claims and scientific terminology have with the present invention under those of ordinary skill is understood conventionally in field identical meanings.
While use in this manual and claims, unless context clearly indicates, " one " and " being somebody's turn to do " of singulative comprise multiple referents.Verb " comprises " and subform, should be interpreted as relating to assembly, parts or step with non-wipe-out mode.Related assembly, parts or step can be existing, use combination with it together with clear other assembly of mentioning, parts or step combination.Verb " link " and subform thereof have referred to the requirement combination of arbitrary form, comprise electricity combination, mechanical bond or fluid combination, to form single object by two or more prior disengaged objects.If first device is linked to the second device, connection can be carried out in direct mode, also can realize by common connector." alternatively " and version refer to that also can not occur can appear in event or the situation described subsequently.This manual comprises the example that event or situation occur and there is no the example occurring." exercisable " and version thereof refer to adaptation for its suitable function and can be used for its expection application.
Spatial terminology is described an object or the group objects relative position with respect to another object or a group objects.Spatial relationship is suitable for along vertical axis and horizontal axis.Use comprises orientation or the related term of " upwards (uphole) " and " downwards (downhole) ", " on " and " under ", "up" and "down" and other similar terms, for convenience, but also unrestricted, unless context clearly indicates.
The scope of this manual or the claims value of providing, should be understood that, interval comprises each median and the upper and lower bound between upper and lower bound.According to the explanation of provided removing property, the present invention comprises and is limited to less interval range.
When this manual and claims relate to the method that comprises two or more determining steps, the step limiting can realize or realize simultaneously with any order, unless context ruled it out.
Figure 1A～Fig. 1 C
Figure 1A～Fig. 1 C is being pre-formed a kind of embodiment of the inventive method shown in the sectional view of pit shaft through stratum, wherein use a kind of embodiment of acidifying instrument.
Figure 1A illustrates the stratum 10 that comprises treatment region 15, and treatment region 15 is the pending parts on stratum 10.By pit shaft 20 layer 10 and treatment region 15 accessibly.Pit shaft 20 extends downward treatment region 15 from ground, and is limited by well bore wall 22.Treatment region 15 has a common boundary at well bore wall 22 places with pit shaft 20, and treatment region 15 radially extends from pit shaft 20.Treatment region 15 has top margin 24 and bottom margin 26, and top margin 24 is by the uppermost component of the come-at-able treatment region 15 of pit shaft 20, and bottom margin 26 is the below parts by the come-at-able treatment region 15 of pit shaft 20.
In Figure 1A, (arrow 32) the acidifying instrument 30 of introducing enters pit shaft 20, and its top margin 24 close to treatment region 15 is located.Introduce acidifying instrument 10 and be linked to coil pipe 34.Coil pipe can operate to supply with acid batching and electric power from ground to acidifying instrument 30.By sour induction system 36, acid batching is introduced into treatment region 15, this acid induction system 36 comprises sour circulation road 38, and this acid circulation road 38 can operate to introduce the well bore wall 22 that acid is prepared burden to treatment region 15.
A kind of embodiment of this method comprises the situation that stratum treatment region is made up of carbonate rock.
Figure 1B illustrates by sour circulation road 38 and introduces the acidifying instrument 30 of acid batching (nozzle 40) to treatment region 15.Acidifying instrument 30 is distributed to acid 40 radial manner of preparing burden from the top margin 24 for the treatment of region 15 to the well bore wall 22 of bottom margin 26.Acid batching 40 applies the well bore wall 22 being distributed to, and this allows and spreads and penetrate into treatment region 15, the acid treatment part 42 in formation processing district 15 from prepare burden 40 acid of acid.Acid penetrates into treatment region 15 and reaches initial acid length of penetration 44, this be from well bore wall 22 start to measure obtain enter stratum 10 degree of depth.Figure 1B illustrates that acid batching 40 imports the further acidifying instrument 30 of introducing simultaneously and enters pit shaft 20.
Acid batching comprises acid.The hydrochloric acid of dilution and sulfuric acid are the useful examples for the acid solution of acid batching.A kind of embodiment of this method comprises that use weak acid is as the acid in formula.Weak acid is the not exclusively acid of dissociation under water exists.Acetic acid, formic acid, fluoboric acid and ethylenediamine tetra-acetic acid (EDTA) are the examples of available weak acid.Such weak acid is considered to available: in the time contacting with the mineral that exist in stratum, they are not to occur in moment with reacting of stratum Minerals, also not exclusively, but measure with known reaction constant yet, allow to apply ultrasonic energy.A kind of embodiment of this method comprises pH value that acid the has situation in approximately 2 to approximately 5 scopes.
As a part for applied gel or foaming, sour batching can postpone and the contacting of well bore wall.Gel or foaming also can reduce the amount of the acid batching directly contacting with well bore wall, and this has increased the amount of unreacted acid batching, and these unreacted acid batchings can be used for being subject to the driving of ultrasonic energy and enter treatment region.Because foaming or gel are attached to well bore wall, approach its distribution position, foaming or gel can also improve the location of acid batching.A kind of embodiment of this method comprises such situation, and acid batching is a part for gel, and this gel can operate with physics mode and be attached to well bore wall.A kind of embodiment of this method comprises such situation, and acid batching is a part for foaming, and this foaming can operate with physics mode and be attached to well bore wall.Pressurization gas, comprises nitrogen, air and carbon dioxide, is useful for producing foaming to carry acid batching.
Acidifying instrument 30 also comprises ultrasonic transmitter 50 (being shown in inside).Fig. 1 C illustrates the acidifying instrument 30 that uses ultrasonic transmitter 50 to introduce ultrasonic energy (arrow 52) to treatment region.Acidifying instrument 30 is launched ultrasonic energy 52, and from the top margin 24 for the treatment of region 15 to bottom margin 26, radial manner enters treatment region 15.Ultrasonic energy 52 radiation are through the acid treatment part 42 for the treatment of region 15.The acid that ultrasonic energy 52 promotes in acid treatment part 42 deeper enters treatment region 15, the ultrasonic processing section 54 in formation processing district 15.Acid deeper penetrates into treatment region 15, reaches follow-up sour length of penetration 56, and this degree of depth is for measuring the obtained degree of depth that enters stratum 10 from well bore wall 22.Follow-up sour length of penetration 56 is values (namely, from well bore wall 22 deeper enter stratum 10) larger than initial acid length of penetration 44.Fig. 1 C illustrates that ultrasonic energy 52 imports, and makes acidifying instrument 30 extract out from pit shaft 20 simultaneously, the position that this allows acidifying instrument 30 to reach close to top margin 24.
Based on concentration, type and the quantity of use acid batching, ultrasonic transmitter can be introduced ultrasonic energy and enter stratum in some frequency ranges and strength range.A kind of embodiment of this method comprises with approximately 10 kilo hertzs (kHz) and imports ultrasonic energy to the frequency in approximately 1 megahertz (MHz) scope.A kind of embodiment of this method comprises with intensity of acoustic wave (sound intensity) the importing ultrasonic energy in every square centimeter of approximately 1 watt to approximately 10 watts (W/cm2) scope.
Introduce acid batching and ultrasonic energy by acidifying instrument in roughly the same direction, to promote sour dispersion to go deep into stratum.A kind of embodiment of this method comprises such situation: the two all imports acid batching and ultrasonic energy from acidifying instrument radial manner.This allows the resultant action scope on the stratum starting from pit shaft.A kind of embodiment of this method comprises that the two is introduced into concern process points by acid batching and ultrasonic energy.
Acid in acid batching is reacted with the mineral constituent on stratum.Usable acid batching is such, and the reaction speed of acid and stratum mineral constituent is lower than the speed through stratum diffusion.Once use weak acid can prevent acid to be introduced into pit shaft wall and just to consume the situation of all acid.In addition, once acid batching is mixed into gel or foaming and also can prevent acid to be initially applied to well bore wall and just to consume the situation of most of acid.This allows to make to maximize through the diffusion length on stratum, and the stratum of having improved each processing strengthens quality, instead of with the sour whole amounts surface of acidification well bore wall simply of apply.A kind of embodiment of this method comprises such situation, make before acid diffuses into stratum by importing ultrasonic energy, considerable part acid not with response of stratum.In a kind of embodiment of this method, " considerable part " refers to import by acid batching sour at least 50%.In one embodiment, considerable part refers at least 60% of import acid.In one embodiment, considerable part refers at least 70% of import acid.In one embodiment, considerable part refers at least 80% of import acid.In one embodiment, considerable part refers at least 90% of import acid.In one embodiment, considerable part refers at least 95% of import acid.
Depth difference between initial acid length of penetration and follow-up sour length of penetration depends on several factors, comprise ultrasonic energy intensity of acoustic wave and frequency, apply acid batching and apply the time between ultrasonic energy, the time that is exposed to ultrasonic energy, acid composition and stratum and form.A kind of embodiment of this method comprises, starts to measure from well bore wall, and the depth difference between initial acid length of penetration and follow-up sour length of penetration is at least 50% larger.A kind of embodiment of this method comprises, starts to measure from well bore wall, and the depth difference between initial acid length of penetration and follow-up sour length of penetration is in approximately 50% to approximately 90% larger scope.
The mode that this processing method does not require to exceed formation breakdown gradient pressure imports acid batching.Although as fracturing or " pressure break " fluid potential be useful, but, use fluid transmission and diffusion machinery, can the acid that operational applications strengthens in deep acidizing batching, to allow acid to diffuse into stratum through well bore wall.A kind of embodiment of this method comprises that importing acid with the pressure lower than formation breakdown gradient force value prepares burden.
A kind of embodiment of this method comprises the surfactant that does not import outside supply.
Fig. 2
Be similar to Figure 1A～C, Fig. 2 is at a kind of embodiment through using the inventive method shown in the sectional view that is pre-formed pit shaft on stratum, and this embodiment provides a kind of embodiment that uses acidifying instrument.Acidifying instrument 130 is introduced acid batching (nozzle 140) to treatment region 115 by sour circulation road 138.Acid circulation road 138 is positioned in lower position along acidifying instrument 130.Acidifying instrument 130 is from the top margin 124 for the treatment of region 15 to bottom margin 126 distribution acid batchings 140.Spread and penetrate into treatment region 115 from the acid of acid batching 40, forming acid treatment part 142.Acid penetrates into treatment region 115 and reaches initial acid length of penetration 144.
Meanwhile, use ultrasonic transmitter 150 (being shown in inside), acidifying instrument 130 is introduced ultrasonic energy (arrow 152) to treatment region 115.Ultrasonic transmitter 150 is positioned at the top of sour circulation road 138.Introduce acidifying instrument 130, thereby for the permanent position in treatment region 115, before importing ultrasonic energy 152, make well bore wall 122 be exposed to acid batching 140.Acidifying instrument 130 is launched ultrasonic energy 152 from top margin 124 to bottom margin 126.Ultrasonic energy 152 radiation are through acid treatment part 142, and the acid promoting in acid treatment part 142 deeper enters treatment region 115, to form ultrasonic processing section 154.Acid deeper penetrates into treatment region 115, reaches follow-up sour length of penetration 156.Follow-up sour length of penetration 156 is greater than initial acid length of penetration 144.
Fig. 3
Fig. 3 illustrates the sectional view of acidifying execution of instrument example.Acidifying instrument 230 has sour induction system 236, and this acid induction system 236 is with multiple sour circulation roads 238.Acid circulation road 238 is such, and they can operate the process points 260 acid batching (nozzle 240) is introduced into concern.Acidifying instrument 230 also has ultrasonic transmitter 250, and this ultrasonic transmitter 250 is positioned to can operate to introduce ultrasonic energy (arrow 252) to paying close attention to process points 260.This embodiment of acidifying instrument allows to introduce acid batching 240 and ultrasonic energy 252 to paying close attention to process points 260 simultaneously, drives acid to go deep into stratum 210.Acidifying instrument 230 is shown and is linked to ground with curling pipe arrangement 234 and transmission of electricity spool 262, and curling pipe arrangement 234 is supplied with acid batching, and transmission of electricity spool 262 is supplied with electric power.
A kind of embodiment that deep acidizing strengthens comprises such situation, by all pointing to concern process points, acidifying instrument introduce simultaneously acid batching and ultrasonic energy the two.Paying close attention to process points is point on well bore wall or the shorter length along well bore wall.
Use this acidifying execution of instrument example to introduce acid batching and ultrasonic energy at concern process points place, be useful for the built-in vertical directional fracturing of ground layer segment being under stress simultaneously.Introduce acidifying instrument and enter pit shaft, make it close to paying close attention to process points location.This concern process points is associated with the ground layer segment being under stress.
By introduce acid batching and ultrasonic energy at concern process points place simultaneously, at this position, acid diffusion is goed deep into stratum.The importing of acid batching does not require the fracture gradient exceeding in stress sub-surface part.Acid in stratum and response of stratum, and cause weak acidifying point to form.
Although shown in Fig. 1 to Fig. 3 in the time applying acid batching and ultrasonic energy, apply acid and be activated and entering stratum in the direction perpendicular to pit shaft orientation, but degree of depth acid is permeated and causes that the method for stress-induced pressure break is not limited only to the angle vertical with pit shaft.In the case of make because of the orientation on stratum stratum self relatively pit shaft with the acid infiltration of an angle of 90 degrees degree of depth, in vertical shaft or skew direction well, apply the situation that acid batching and ultrasonic energy enter production stratum strip as being common in, with remote mode or in the mode that imports pre-determined bit before pit shaft, can operate ultrasonic transmitter for location, make ultrasonic energy apply acid batching and enter stratum by introducing institute with the non-perpendicular angle of pit shaft.For example, Fig. 3 illustrates a kind of acidifying instrument 230, it has the first ultrasonic transmitter 250 and the second ultrasonic transmitter 250, the first ultrasonic transmitter 250 is positioned to introduce its ultrasonic energy 252 to be orientated obtuse-angulate mode with respect to pit shaft, and the second ultrasonic transmitter 250 is positioned to introduce to be orientated acutangulate mode with respect to pit shaft the ultrasonic energy 252 of being launched.
Stress acting in conjunction in stratum in formation and the stratum of weak acidifying point, causes the stress-induced pressure break of the ground layer segment under stress.Stress-induced pressure break is oriented liquid circulation road, and it is not only connected with wellbore fluids, and more deeply enters stratum.In a kind of embodiment of this method, stress-induced pressure break is connected with weak acidifying point fluid.It is the fluid passage that can be used for additional operations that this directional stress is brought out pressure break.
To be greater than the pressure of formation breakdown gradient, fracturing fluid is imported to this directional stress and bring out pressure break, can widen pressure break and make previously fine and close ground layer open to exploit, but than only making stratum hydraulic fracturing, this mode is carried out in measurable and controllable mode.
Fig. 4
Fig. 4 illustrates the sectional view of a kind of embodiment of acidifying instrument.Acidifying instrument 330 comprises the first sour induction system 370 and first ultrasonic transmitter 372 of connecting with the second sour induction system 374 and the second ultrasonic transmitter 376.Prepare burden from ground dispensing acid by curling pipe arrangement 334.The two is all connected the first sour induction system 370 and the second sour induction system 374 and is connected to each other with curling pipe arrangement 334 fluids.The first ultrasonic transmitter 372 that transmission of electricity spool 362 is electrically connected to series system from ground and second ultrasonic transmitter 376 the two transmission electric power.Acidifying instrument 330 allows single to carry out the dispensing of the batching of polyacid more and ultrasonic energy by pit shaft 320.
Auxiliary equipment
Embodiment comprises many additional standard parts or equipment, and they can move said apparatus, process, method and system, and it can be operated.
Man-machine interactively, the control of pre-programmed calculation machine and responding system or its combination be can pass through, operation, control and the execution of a part of step or all steps of process or method carried out.
Test
By the example of specific implementations, contribute to understand better deep acidizing Enhancement Method.These examples should not be used for restriction or limit scope of the present invention.
In order to test the impact of ultrasonic wave on sour length of penetration, use two similar carbonate with similar physical performance and permeance property to bore core.It is all the cylinder with subtend flat end form that two carbonate bore core, and the face with 35 millimeters (mm) is to face length degree.The first brill core has the initial permeability value of 6 millidarcies (mD).The second brill core has the initial permeability value of 8 millidarcies.By with teflon (E.I.du Pont de Nemours and Co.; Wilmingtong, Del.) be wound around cylinder sidepiece but keep end face to expose, prepare each brill core.
The composition of 5 % by weight aqueous acetic acid solution for the acid batching of testing.Acid batching maintains in 25 DEG C, and does not stir to maintain static conditions.
The first brill core and second is bored to the two local being immersed in the bath that fills acid batching all of core, make to bore end face and acid batching fluid contact of core.First bores core keeps its position two hours, and its environment changes without any additional.Second bores core follows same process, and difference is that bath fills acid batching and bores core at two hours acid batching exposure period chien shihs second and is exposed to the ultrasonic energy from supersonic source.Supersonic source is introduced ultrasonic energy (with 300 kilo hertzs) in the end of immersing the second cylinder in acid batching.
After two hours acid batching immersion phases, use computerized tomography (CT) analysis, determine that the first brill core and second bores the two sour seepage distance of core.Start to non-exposure from the fluid exposure of boring core, CT scanner bores core with 5 millimeters of intervals to two carbonate and carries out scanning.CT scanner bores core scanning to two before treated, to set up for baseline relatively.For each brill core, before test and after test, bore the two length of core along the first brill core and second and obtain 7 CT " section ", in order to set up histogram, this histogram is useful in the importing of definite ultrasonic energy aspect the impact of sour length of penetration.
Fig. 5 histogram depth analysis in latter two situation with it before illustrating and being exposed on the first brill core about acid batching.Fig. 6 histogram depth analysis in latter two situation with it before being illustrated in and being exposed on the second brill core about acid batching and ultrasonic energy.
Histogram analysis illustrates, first bore core and second bore core the two all with acid batching in acetic acidreaction.Analyze the moving down of CT Distribution Value producing via CT, this reflects and is exposed to sour end face and changes at a distance of the brill core gross density of this distance.Move down and reflected that acid dissolved mineralogical composition from boring core inner, and reduce its gross density.CT in distributing, do not occur moving down place distance, show that acid does not infiltrate into this degree of depth and from boring core dissolution of minerals.
First bores the histogram analysis of core shows, this brill core of acid infiltration reaches the degree of depth that is no more than 23 millimeters apart from exposure.Exceed this distance, before the first brill core is processed or process after, CT Distribution Value does not have difference, shows that acid does not further penetrate into the first brill core.
Second bores the histogram analysis of core shows, this brill core of acid infiltration reaches apart from the almost degree of depth of 35 millimeters of exposure.Compared with the first brill core, during acid batching is processed, introduce ultrasonic energy and enter the effect of boring core, make sour seepage distance increase at least 50%.This test illustrates, ultrasonic use has increased sour length of penetration.
Claims (22)
1. utilize acidifying instrument to make the method that in stratum, pending district deep acidizing strengthens, comprise the following steps:
Described acidifying instrument is introduced to pit shaft, and described pit shaft can operate to approach described stratum and be limited by well bore wall, and described acidifying instrument can operate to introduce acid batching to described well bore wall and ultrasonic energy is introduced to described stratum;
Acid batching containing sour is incorporated on the described well bore wall at described treatment region place, makes described acid diffuse into the described stratum at described treatment region place, reach initial acid length of penetration; And
Ultrasonic energy is introduced to the described stratum at described treatment region place, made described acid diffuse into the described stratum at described treatment region place, reach follow-up sour length of penetration, described follow-up sour length of penetration is more goed deep in described stratum than described initial acid length of penetration.
2. deep acidizing Enhancement Method according to claim 1, wherein, the described treatment region on described stratum comprises carbonate rock.
3. according to claim 1 or deep acidizing Enhancement Method claimed in claim 2, wherein, described acid batching is gel, is operationally attached to described well bore wall with physics mode.
4. according to claim 1 or deep acidizing Enhancement Method claimed in claim 2, wherein, described acid batching is foaming body, is operationally attached to described well bore wall with physics mode.
According to claim 1 to the deep acidizing Enhancement Method described in any one claim in claim 4, wherein, described acid is weak acid.
According to claim 1 to the deep acidizing Enhancement Method described in any one claim in claim 5, wherein, the pH value that described acid has is in 2～5 scopes.
According to claim 1 to the deep acidizing Enhancement Method described in any one claim in claim 6, wherein, introduce described ultrasonic energy with the frequency in 10 kilo hertzs～1 megahertz range.
According to claim 1 to the deep acidizing Enhancement Method described in any one claim in claim 7, wherein, introduce described ultrasonic energy with the intensity of acoustic wave within the scope of 1～10 watt/square centimeter.
According to claim 1 to the deep acidizing Enhancement Method described in any one claim in claim 8, wherein, described follow-up sour length of penetration is than described initial acid length of penetration at least darker 50%.
According to claim 1 to the deep acidizing Enhancement Method described in any one claim in claim 9, wherein, described acid batching and described ultrasonic energy the two all from described acidifying instrument radial manner introducing.
11. according to claim 1 to the deep acidizing Enhancement Method described in any one claim in claim 10, wherein, make before described acid diffuses into described stratum by introducing described ultrasonic energy, the described acid of considerable part not with described response of stratum.
12. according to claim 1 to the deep acidizing Enhancement Method described in any one claim in claim 11, wherein, the described stratum at described treatment region place has fracture gradient force value, and, introduce described acid batching with the pressure lower than described fracture gradient force value.
13. according to claim 1 to the deep acidizing Enhancement Method described in any one claim in claim 12, wherein, the introducing of described acid batching and the introducing of described ultrasonic energy occur simultaneously, and make the two all point to concern process points.
14. 1 kinds make the method for stratum part stress fracturing, said method comprising the steps of:
Described acidifying instrument is introduced in pit shaft, made it be positioned proximal to concern process points, described concern process points is associated with the ground layer segment under stress, and described acidifying instrument can operate to introduce acid batching and ultrasonic energy at described concern process points place;
Introduce described acid batching and described ultrasonic energy at described concern process points place simultaneously, so that diffuse in the described ground layer segment under stress from the acid of described acid batching, with the pressure of the fracture gradient of the ground layer segment lower than under stress, introduce described acid batching
Wherein, the described acid that diffuses into the ground layer segment under stress forms weak acidifying point, and the described stress acting in conjunction in described weak acidifying point and described ground layer segment, causes having formed the directional stress being connected with described wellbore fluids and bring out pressure break.
15. stress fracturing methods according to claim 14, further comprise the steps, to be greater than the pressure of fracture gradient of the ground layer segment under stress, fracturing fluid is introduced to described directional stress and bring out in pressure break.
16. 1 kinds at the acidifying instrument through using in the pit shaft on stratum, and described acidifying instrument comprises:
Acid induction system, it can operate that acid batching is incorporated on the well bore wall of described pit shaft, and
Ultrasonic transmitter, it can operate ultrasonic energy to be introduced to described stratum.
17. acidifying instruments according to claim 16, wherein, described sour induction system can operate to introduce gel acid batching.
18. according to the acidifying instrument described in claim 16 or claim 17, and wherein, described sour induction system can operate to introduce foaming acid batching.
19. according to claim 16 to the acidifying instrument described in any one claim in claim 18, and wherein, described sour induction system can operate with radial manner and introduce acid batching.
20. according to claim 16 to the acidifying instrument described in any one claim in claim 19, and wherein, described ultrasonic transmitter can operate the ultrasonic energy in 10 kilo hertzs～1 megahertz range with pull-in frequency.
21. according to claim 16 to the acidifying instrument described in any one claim in claim 20, and wherein, described ultrasonic transmitter can operate with the intensity of acoustic wave with within the scope of 1～10 watt/square centimeter and introduce ultrasonic energy.
22. according to claim 16 to the acidifying instrument described in any one claim in claim 21, and wherein, described sour induction system can operate to introduce acid batching, and described ultrasonic transmitter can operate ultrasonic energy to be introduced into concern process points.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201161568279P | 2011-12-08 | 2011-12-08 | |
| US61/568,279 | 2011-12-08 | ||
| PCT/US2012/068379 WO2013086278A2 (en) | 2011-12-08 | 2012-12-07 | Method and acidizing tool for deep acid stimulation using ultrasound |
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| Publication Number | Publication Date |
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| CN104081000A true CN104081000A (en) | 2014-10-01 |
| CN104081000B CN104081000B (en) | 2017-03-08 |
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| CN201280060215.1A Active CN104081000B (en) | 2011-12-08 | 2012-12-07 | Using ultrasonic deep acidizing Enhancement Method and acidifying instrument |
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| Country | Link |
|---|---|
| US (1) | US20130146281A1 (en) |
| EP (1) | EP2788577B1 (en) |
| CN (1) | CN104081000B (en) |
| CA (1) | CA2858088C (en) |
| NO (1) | NO2855231T3 (en) |
| WO (1) | WO2013086278A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105863596A (en) * | 2016-05-05 | 2016-08-17 | 中国矿业大学 | Ultrasonic wave and hydrofracture compound coal-body fracturing simulation device and method for underground coal mine |
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| CA2889227C (en) * | 2014-04-28 | 2017-03-07 | Todd Parker | Method and device for stimulating a treatment zone near a wellbore area of a subterranean formation |
| US10612348B2 (en) * | 2015-08-06 | 2020-04-07 | Ventora Technologies Ag | Method and device for sonochemical treatment of well and reservoir |
| CN105464635A (en) * | 2015-12-01 | 2016-04-06 | 铜仁中能天然气有限公司 | Shale gas well production increase device with inherent frequency measuring unit |
| RU2649712C1 (en) * | 2017-02-14 | 2018-04-04 | Общество с ограниченной ответственностью "НТС-Лидер" | Method of processing of oil reservoir |
| US10787874B2 (en) * | 2017-05-18 | 2020-09-29 | Ncs Multistage Inc. | Apparatus, systems and methods for mitigating solids accumulation within the wellbore during stimulation of subterranean formations |
| WO2019074390A1 (en) | 2017-10-10 | 2019-04-18 | Анна Владимировна КАМЛЕР | Immersible ultrasonic transmitter |
| US11525723B2 (en) | 2020-08-31 | 2022-12-13 | Saudi Arabian Oil Company | Determining fluid properties |
| US11428557B2 (en) | 2020-08-31 | 2022-08-30 | Saudi Arabian Oil Company | Determining fluid properties |
| US11807807B2 (en) | 2022-01-26 | 2023-11-07 | Saudi Arabian Oil Company | Selective and on-demand near wellbore formation permeability improvement with in-situ cavitation of nanobubbles |
| CN114737938A (en) * | 2022-03-21 | 2022-07-12 | 重庆大学 | Coal seam ultrasonic activation staged fracturing device |
| US11767738B1 (en) | 2022-12-15 | 2023-09-26 | Saudi Arabian Oil Company | Use of pressure wave resonators in downhole operations |
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- 2012-12-07 WO PCT/US2012/068379 patent/WO2013086278A2/en active Application Filing
- 2012-12-07 CA CA2858088A patent/CA2858088C/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2013086278A2 (en) | 2013-06-13 |
| CA2858088A1 (en) | 2013-06-13 |
| CA2858088C (en) | 2019-10-08 |
| WO2013086278A3 (en) | 2014-03-20 |
| EP2788577A2 (en) | 2014-10-15 |
| EP2788577B1 (en) | 2018-02-28 |
| US20130146281A1 (en) | 2013-06-13 |
| CN104081000B (en) | 2017-03-08 |
| NO2855231T3 (en) | 2018-03-24 |
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