CN110344800A - A kind of staged fracturing method for horizontal well - Google Patents
A kind of staged fracturing method for horizontal well Download PDFInfo
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- CN110344800A CN110344800A CN201810282838.2A CN201810282838A CN110344800A CN 110344800 A CN110344800 A CN 110344800A CN 201810282838 A CN201810282838 A CN 201810282838A CN 110344800 A CN110344800 A CN 110344800A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001303 quality assessment method Methods 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims description 34
- 238000007789 sealing Methods 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 14
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 13
- 238000003825 pressing Methods 0.000 description 8
- 230000000977 initiatory effect Effects 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000023753 dehiscence Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention proposes a kind of staged fracturing methods for horizontal well, including step 1, carry out cementing quality assessment to the pit shaft of horizontal well；Step 2 selectes bridge plug setting position according to cementing quality assessment result.This method can improve the effect of staged fracturing in the case where cementing quality is bad.
Description
Technical field
The present invention relates to oil gas well cementing operation field of engineering technology, and in particular to a kind of staged fracturing side for horizontal well
Method.
Background technique
Currently, deep layer shale gas is drilled well and the well number of pressure break is more and more.But due to architectonic complexity,
Various high angle intrinsic fractures and horizontal bedding seam etc. may exist jointly.So that mud when drilling well is missed and increased, or even hold
Easily occur to lose the property returned leakage.In this case, cementing slurry is also easy to migrate along the leakage channel of drilling mud, so that water
Mud being unevenly distributed between sleeve outer wall and uncased wellbore inner wall.Large-scale segmentation pressure may be not achieved in final cementing quality
Split the integrity demands to cement sheath.If still needing to carry out staged fracturing at this time, possible consequence is that different sections of fracturing fluid does not have
It effectively separates, all fracturing fluids all may press off section into a few, are finally not carried out and sufficiently change to all sections
It makes, to influence pressing crack construction effect.
Therefore, under conditions of the total quality of above-mentioned net horizontal section is bad, it is necessary to targetedly measure be taken to mention
Effect after the success rate and pressure of high sublevel pressure break.
Summary of the invention
For some or all of of the above-mentioned technical problem in the presence of the prior art, the invention proposes one kind to be used for
The staged fracturing method of horizontal well.This method can improve staged fracturing in the case where the total quality of net horizontal section is bad
Effect.
According to the invention it is proposed that a kind of staged fracturing method for horizontal well, comprising:
Step 1 carries out cementing quality assessment to the pit shaft of horizontal well,
Step 2 selectes bridge plug setting position according to cementing quality assessment result.
In one embodiment, which is arranged that in cementing quality to be at least good and continuous sealing length not small
At 2 meters, and the distance between adjacent bridge plug setting position is not less than 40 meters.
In a preferred embodiment, the setting of the selected bridge plug setting position is excellent and continuous sealing in cementing quality
Length is not less than at 2 meters or cementing quality is that good and continuous sealing length is not less than at 4 meters.
In one embodiment, the distance between adjacent described bridge plug setting position is 70-80 meters.
In one embodiment, if the first bridge plug setting position and the second bridge plug setting position selected according to step 2
The distance between be greater than 150 meters, then selected between first bridge plug setting position and the second bridge plug setting position other
Bridge plug setting position carries out pressure break between the other bridge plug setting position and first bridge plug setting position.
In one embodiment, if the first bridge plug setting position and the second bridge plug setting position selected according to step 2
The distance between be greater than 150 meters, then between first bridge plug setting position and the second bridge plug setting position carry out waterpower spray
Penetrate pressure break.
In one embodiment, on the extending direction of the A target spot by horizontal well to B target spot, pressure break, the pressure break are carried out
Including more shower holes, the diameter of each cluster hole eye in more shower holes is proportionally incremented by, and the eye diameter of each cluster hole eye is not
14 millimeters can be greater than.
In one embodiment, on the extending direction of the A target spot by horizontal well to B target spot, each cluster hole in more shower holes
The diameter of eye is incremented by according to the ratio of 5-10%.
In one embodiment, after the completion of more shower holes, low-kappa number operation is carried out, it is first every using 1-1.5 cubic metres
Minute discharge capacity inject a certain amount of acid to stratum, acid is then squeezed with the discharge capacity of 3-5 cubic meters per minute, then make acid successively into
Enter in the crack of each shower hole.
In one embodiment, when acid reaches the first shower hole crack, made with the discharge capacity of 1.5-2 cubic meters per minute
Acid enters the first shower hole crack, then steps up discharge capacity with the ratio of 50-250% and acid is made to sequentially enter other each showers
In the crack of hole.
In one embodiment, it after low-kappa number operation, is constructed with the highest discharge capacity of design so that each shower hole
Fracture extension.
Compared with the prior art, the advantages of the present invention are as follows select cementing quality by the cementing quality of analysis level well
At least good and continuous sealing length, which is not less than at 2 meters, is arranged bridge plug setting position, and the bridge plug setting position is apart from upper one
The distance of set bridge plug setting position is not less than 40 meters, and the mode that this set horizontal well carries out staged fracturing is simpler
It is single, can be effectively reduced because cementing quality is bad and caused by pressing crack construction effect difference phenomenon, can be in low cementing quality condition
Lower raising pressing crack construction success rate increases staged fracturing crevice volume, to obtain bigger economic benefit.
Detailed description of the invention
The present invention is described in more detail hereinafter with reference to attached drawing.Wherein:
Fig. 1 shows a kind of one embodiment of staged fracturing method for horizontal well according to the present invention.
Fig. 2 shows a kind of one embodiment of staged fracturing method for horizontal well according to the present invention.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be further described.
The invention proposes a kind of staged fracturing methods for horizontal well.In method, firstly, to the pit shaft of horizontal well
Carry out cementing quality assessment.It is, the cementing quality section of comprehensive analysis horizontal segment.For example, to the cementing quality of horizontal well
Evaluation can use standard No. for SY/T 6592-2016 standard carry out.Certainly, to the evaluation of the cementing quality of horizontal well
It can also be carried out using other standards.Also, it since Geotechnical Parameter has certain randomness, is then cemented the well according to specific engineering
Quality evaluation result can be also slightly different.Resulting cementing quality can be dependent on acoustic logging and carry out explanation results.
Then, according to above-mentioned cementing quality assessment result, bridge plug setting position is selected, wherein the bridge plug setting position is set
It sets and is at least good and continuous sealing length not less than at 2 meters in cementing quality.In addition, a bridge plug setting position in n-th (n >=2) away from
It is not less than 40 meters with a distance from the bridge plug setting position set by upper one.It is, the cementing quality structure of reference level well,
Design bridge plug setting position.
Aforesaid operations method has fully considered cementing quality assessment result, and by the setting of bridge plug setting position solid
Well quality is at least good and continuous sealing length and is not less than at 2 meters, to guarantee to set effect.Meanwhile two adjacent bridge plugs it
Between distance be not less than 40 meters, to guarantee the staged fracturing of horizontal well.The above method is easy to operate, can be effectively reduced because of well cementation
Quality it is bad and caused by pressing crack construction effect difference phenomenon, under the conditions of low cementing quality improve pressing crack construction success rate, increase
Bonus point section fracturing fracture volume, to obtain bigger economic benefit.
In a preferred embodiment, the setting of bridge plug setting position is that excellent and continuous sealing length is not small in cementing quality
At 2 meters or cementing quality is that good and continuous sealing length is not less than at 4 meters.It is further preferred that bridge plug setting position is set
The excellent and continuous sealing length in cementing quality is set to be greater than at 3 meters.That is, bridge plug is set, preferred cementing quality is excellent and continuous envelope
Gu length is greater than at 3 meters.And by cementing quality be excellent and continuous sealing length not less than 2 meters at or cementing quality be good and even
Continuous sealing length is not less than at 4 meters as less preferred.And on this basis, between adjacent bridge plug setting position distance away from
From can be 70-80 meters.Above-mentioned setting can guarantee bridge plug sealing quality, to guarantee staged fracturing effect.Meanwhile above-mentioned setting energy
Optimize the installation position and distance of bridge plug, to improve staged fracturing construction success rate, increases staged fracturing crevice volume.
Fig. 1 schematically shows one embodiment of the well with vertical bore and horizontal wellbore.In target spot A and target spot
The first bridge plug setting position C selected first, the cementing quality of the position where first bridge plug setting position C are at least between B
Amount and continuously sealing length are not less than 4 meters.It is set at first bridge plug setting position C, and in target spot B and the first bridge plug
Pressure break is carried out at position a between the C of setting position.Then, the second bridge is selected between the first bridge plug setting position C and target spot A
Setting position D is filled in, which is in the upstream of the first bridge plug setting position C.Then, it is set in the second bridge plug
It is set at the D of position, and the corresponding position between the first bridge plug setting position C and the second bridge plug setting position D carries out
Pressure break.Certainly, as needed, the second bridge plug setting position D can be selected simultaneously with the first bridge plug setting position C.
Herein, pressure break includes perforation and the subsequent fracture job including adding sand, replacement etc..
Under certain conditions, at least good (preferably excellent) the bridge plug setting position of cementing quality is selected to be sat
Envelope.At this time, it is possible to the distance between selected two adjacent bridge plug setting position C and D are very long, (for example, be greater than or
Equal to 150m).As shown in Fig. 2, it is possible thereby to being selected again between the first bridge plug setting position C and the second bridge plug setting position D
Other bridge plug setting position E set other bridge plug at the E of the bridge plug setting position.At bridge plug setting position C and D
Cementing quality be it is excellent in the case where, the cementing quality at the E of bridge plug setting position is preferably good.At bridge plug setting position C and D
Cementing quality be it is good in the case where, the cementing quality at the E of bridge plug setting position can be slightly below good.Bridge plug setting position E with
Pressure break is carried out at position b between the C of bridge plug setting position.In addition, can also bridge plug setting position E and bridge plug setting position D it
Between corresponding position carry out pressure break.Such as pressure break can be carried out by conventional pressure break mode.The routine pressure break mode may include
More shower holes.Preferably, on the extending direction by the target spot A to target spot B of horizontal well, the diameter of each cluster hole eye in more shower holes
Proportionally it is incremented by, and the eye diameter of each cluster hole eye cannot be greater than 14 millimeters.It is further preferred that in the target spot by horizontal well
On the extending direction of A to target spot B, the diameter of each cluster hole eye in more shower holes is incremented by according to the ratio of 5-10%.This set side
Formula can guarantee the uniform feed liquor in more shower holes, to guarantee staged fracturing effect.
In some instances it is possible to which the distance between two bridge plug setting position C and D are grown (for example, being greater than or waiting very much
In 150m), this is because all there is no cementing qualities to be at least in the very long one end distance of the first bridge plug of distance setting position C
Good and continuous sealing length is not less than 2 meters of position.At this point, as shown in Figure 1, can be in the first bridge plug setting position C and the second bridge
It fills in selected location M between the D of setting position and carries out hydraulic jetting fracturing.Using hydrajetting techniques, plane perforation may be implemented, with
It realizes fixed point crack initiation and extends crack, can be effectively controlled fracture initiation position, guarantee construction effect.In addition, hydraulic perforation
Duct does not have compaction band compared with conventional perforation duct depth, can effectively reduce fracture initiation pressure.It is, of course, also possible to using macropore
The deep penetrating perforating strategy of diameter (being greater than 14 millimeters).
Above-mentioned routine pressure break mode is carried out using the pressure break of hydrajetting techniques progress and using deep penetrating perforating strategy
The method of pressure break itself be well known for ordinary skill in the art, be not added repeat herein.
Preferably, the case where the distance between bridge plug setting position C and D very long (for example, being greater than or equal to 150m)
Under, can first judge whether that bridge plug setting position E can be arranged between bridge plug setting position C and D.If cannot, reselection is in bridge
Direct pressure break is carried out by hydrajetting techniques or deep penetrating perforating strategy between plug setting position C and D.This is because at it
It is all carried out using lower-cost conventional pressure break mode when his section carries out fracturing work.Pass through hydrajetting techniques or deep penetration
Although perforation strategy carrys out but higher cost relatively good to progress pressure break effect between bridge plug setting position C and D, and by routinely pressing
The mode of splitting, which changes into through hydrajetting techniques or deep penetrating perforating strategy, when carrying out pressure break, needs to change other tubing strings and equipment
It carries out, and needs the operating personnel to carry out additional operation and preparation.
In one embodiment, after the completion of more shower holes, low-kappa number operation is carried out, such as using hydrochloric acid, first use
The discharge capacity of 1-1.5 cubic meters per minute injects a certain amount of acid to stratum.After having been injected Deng acid, with 3-5 cubic meters per minute
Discharge capacity squeezes acid, and this mode for improving discharge capacity can be improved construction efficiency, shorten the construction time.The first shower porous dehiscence is reached in acid
When stitching (in the prior art, can detect and conclude by ground instrument), acid is made with the discharge capacity of 1.5-2 cubic meters per minute
Into the first shower hole crack.Such as acid is made to enter the first shower hole crack with the discharge capacity of 1.7 cubic meters per minutes.It is this suitable
When lower the operation of discharge capacity and can increase sour and the contact of shower hole location tamper and its rock and reaction time, with abundant
It meets the requirements.Finally, sour discharge capacity can be improved in time, avoid squeezing acid using a kind of discharge capacity, most of acid all enters first
In the crack of shower hole, other shower holes may be not carried out low-kappa number and be difficult to be pressed off and extended at crack.Preferably, with
The ratio of 50-250% steps up discharge capacity and acid is sequentially entered in the crack of each shower hole.It is, for next (the
Two) ratio of the discharge capacity in shower hole crack and the discharge capacity for upper (second) shower hole crack is 1.5-3.5.And discharge capacity increases
Timing node can be determined according to the volume of crowded acid.For example, a discharge capacity can be improved in 2 shower in this way hole, and arrived squeezing acid amount
Up to total acid content 40-50% when improve discharge capacity.3 shower in this way hole, then can be improved discharge capacity twice, and while proposing discharge capacity every time exists respectively
Squeeze 25-30% the and 60-70% when progress that acid amount reaches total acid content.Other number of clusters are executed by above-mentioned similar method.
In one embodiment, to increase the probability that the uniform crack initiation in more shower holes crack extends, after low-kappa number,
It should be constructed immediately with the highest discharge capacity of design, with the pressure in winding level pit shaft to the maximum extent, realize while pressing off more clusters
The purpose in perforation crack.And the highest discharge capacity of concepts described herein according to the case where different horizontal wells with different specific
Numerical value.
After the completion of (that is, after perforation and low-kappa number operation) in crack, uniform crack initiation extends construction, it can carry out adding sand
With replace etc. subsequent fracturing work, and mode of operation according to routine operation in the prior art carry out.
In horizontal wellbore staged fracturing operating process, after completing one section of fracturing work, tripping in bridge plug is to be sat
Envelope, and perforation, low-kappa number pressure break and subsequent fracture job are repeated in the upstream of tripping in bridge plug.
When carrying out the perforation in pressure break in a certain section, using the method for non-homogeneous step cluster, make every cluster crack all as far as possible
Equably extend.In this way, balance pressure can be achieved close to equal, between the crack between adjacent cluster for pressure of every cluster crack at pit shaft
Effect.That is, the pressure difference that the cement sheath between adjacent cluster is born is almost 0.The long-term steady of cement sheath can be kept as a result,
It is qualitative.Thus, it is preferable that the shale geology quality carried out at the position of perforation is close uniformly, prevents due to heterogeneous difference is big
Cause the unbalanced extension (this can destroy above-mentioned pressure balance) in crack.
In a specific example.Certain shale gas well A well, net horizontal section depth is 2237-3260m, flat to the well water
The cementing quality of section has carried out CBL-VDL well logging.Well cementation data is shown in main outlet interval, CBL measured value 6%~72% it
Between, VDL casing wave is clear, and formation wave is unobvious, in chevron variation variation, the cementing quality at the first, second interface at box cupling
It is a small amount of medium, good based on cementing difference.Table 1 gives the cementing quality and its reservoir parameter of part of horizontal well section.
1 shale gas A well horizontal segment cementing quality of table and reservoir parameter table
Pressing crack construction is carried out to A well according to the method in the application, open-flow capacity reaches 10 × 104 cubes after Jing Jing pressure
Rice, referring to table 1 by taking fracturing section first segment as an example, steps are as follows for Specific construction:
(1) according to A well horizontal segment cementing quality in table 1 and reservoir parameter situation, those skilled in the art can be with
Judge that depth is at 3139 meters -3160 meters and depth be cementing quality at 3195 meters -3268 meters is excellent, and depth is
Cementing quality at 3160 meters -3195 meters is good, and the cementing quality at 2942 meters -3132 meters and 3132 meters -3139 meters is not
Qualification thereby determines that the seat preferably at 3210m and 3140m is distinguished according to this patent method in first segment bridge plug position by the well section
Envelope；
(2) referring to the parameter in table 1, tripping in bridge plug sets it at 3210m, then carries out perforation.Perforation is set as 2
Shower hole, shower hole site are chosen at 3163-3164.5m and 3184.5-3186m.1.5 meters of every cluster, using 89 millimeters of perforating guns,
102 bullets, the 16 meters of every holes Kong Mi, 60 degree of phase.Aperture at 3163-3164.5m is 12 millimeters, the aperture at 3184.5-3186m
It is 13 millimeters；
(3) after the completion of perforation, with 15 cubic metres of hydrochloric acid of the discharge capacity note 15% of 1.5 cubic meters per minutes.After having been infused Deng acid,
Acid is squeezed with 3 cubic meters per minute discharge capacities, discharge capacity is reduced to 1.5 cubic metres every point when acid reaches perforation cluster at 3163-3164.5m
Clock increases the hydrochlorate reaction time, then, when squeezing the 50% of acid amount arrival total acid content, proposes discharge capacity again to 3 cubic metres every point
Clock makes acid solution enter perforation cluster at 3184.5-3186m, finishes until squeezing acid；
(4) preposition acid injection finishes, and with hydraulic fracturing vehicle group, is carried out with 10-14 cubic meters per minute huge discharge note smooth
Alternately injection is completed to add the subsequent fracture job such as sand and replacement for water and glue；
(5) tripping in bridge plug sets it at 3140m, carries out next section of fracturing operation.
Bridge plug setting position, perforating job, low-kappa number etc. is optimized in above-mentioned construction, mentions to greatest extent
The purpose of production effect after high shale gas kill-job.After being constructed by the above method to A well, well A and same block,
Other wells are compared as reservoir geology parameter similar, and the tired production in one year can be improved about 30%.
The above is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, any this field
Technical staff in technical scope disclosed by the invention, can be easy to carry out and be altered or varied, and this be altered or varied all
It is covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection scope of claims
It is quasi-.
Claims (10)
1. a kind of staged fracturing method for horizontal well characterized by comprising
Step 1 carries out cementing quality assessment to the pit shaft of horizontal well,
Step 2 selectes bridge plug setting position according to cementing quality assessment result.
2. method according to claim 1 or 2, which is characterized in that the bridge plug setting position setting cementing quality at least
It is not less than at 2 meters for good and continuous sealing length, and the distance between adjacent bridge plug setting position is not less than 40 meters.
3. method according to claim 1 or 2, which is characterized in that the distance between adjacent described bridge plug setting position
It is 70-80 meters.
4. method according to claim 1 or 2, which is characterized in that if set according to the first bridge plug that step 2 is selected
The distance between position and the second bridge plug setting position are greater than 150 meters, then in first bridge plug setting position and the second bridge plug
Other bridge plug setting position is selected between setting position, is set in the other bridge plug setting position with first bridge plug
Pressure break is carried out between position,
The cementing quality of first bridge plug setting position and second bridge plug setting position is excellent, the other bridge plug seat
It is good for sealing the cementing quality of position.
5. method according to claim 1 or 2, which is characterized in that if set according to the first bridge plug that step 2 is selected
The distance between position and the second bridge plug setting position are greater than 150 meters, then in first bridge plug setting position and the second bridge plug
Hydraulic jetting fracturing is carried out between setting position.
6. method according to claim 1 or 2, which is characterized in that in the A target spot by horizontal well to the extension side of B target spot
Pressure break is carried out upwards, the pressure break includes more shower holes, and the diameter of each cluster hole eye in more shower holes is proportionally incremented by, and
The eye diameter of each cluster hole eye cannot be greater than 14 millimeters.
7. according to the method described in claim 6, it is characterized in that, the A target spot by horizontal well to B target spot extending direction
On, the diameter of each cluster hole eye in more shower holes is incremented by according to the ratio of 5-10%.
8. method according to claim 6 or 7, which is characterized in that after the completion of more shower holes, carry out low-kappa number work
Industry first injects a certain amount of acid to stratum using the discharge capacity of 1-1.5 cubic meters per minute, then with 3-5 cubic meters per minute
Discharge capacity squeezes acid, then acid is sequentially entered in the crack of each shower hole.
9. according to the method described in claim 8, it is characterized in that, acid reach the first shower hole crack when, with 1.5-2 cubes
Rice discharge capacity per minute makes acid enter the first shower hole crack, then steps up discharge capacity with the ratio of 50-250% and makes acid
It sequentially enters in other each shower hole cracks.
10. according to the method described in claim 8, it is characterized in that, after low-kappa number operation, with the highest discharge capacity of design
Construction is so that each shower hole fracture extension.
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