CN104975840B - A kind of spontaneous compound acid fracturing method of acid for high temperature deep well carbonate reservoir - Google Patents
A kind of spontaneous compound acid fracturing method of acid for high temperature deep well carbonate reservoir Download PDFInfo
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Abstract
The present invention relates to the spontaneous compound acid fracturing method of acid for high temperature deep well carbonate reservoir, including following processes：1) slippery water is injected into stratum by oil pipe；2) non-crosslinked fracturing fluid is injected into stratum by oil pipe；3) spontaneous acid system is injected into stratum by oil pipe；4) by oil pipe, into stratum, low discharge capacity injects gelled acid system；5) slippery water is injected into stratum by oil pipe；Wherein, process 1), the liquid that 2), 3), 4), 5) is injected accounts for the volume ratio of the injection total liquid in stratum and is respectively：Process 1) described in slippery water account for 3 10%, process 2) described in non-crosslinked fracturing fluid account for 40~60%, process 3) described in spontaneous acid system account for 30~50%, process 4) described in gelled acid system account for 3~10%, process 5) described in slippery water volume ratio be 3~15%, wherein volume unit is m3.Flow conductivity is improved by the present invention and reaches more than 140mdm, high temperature deep well carbonate reservoir deep penetration positive effect.
Description
Technical field
The present invention relates to oil-gas field development technical field, and in particular to it is a kind of for high temperature deep well carbonate reservoir from
The raw compound acid fracturing method of acid.
Background technology
The features such as burying serious depth, reservoir heterogeneity and matrix oiliness difference be present in China's deep carbonate reservoirs,
It is difficult to obtain preferable effect by single acid fracturing method or acid fluid system.Compound ACID FRACTURING TECHNOLOGY is to produce late 1980s
A kind of new well production increment, intensified injection of wells technology, the technology be to oil-water well carry out reservoir reconstruction when, will be different
Renovation technique is had complementary advantages, and more effectively realizes increasing yield and injection.The application of compound ACID FRACTURING TECHNOLOGY substantially increases acid etching and split
The scale and flow conductivity of seam, have substantially met the needs of high temperature deep well carbonate reservoir storey increase design.
To be adapted to the needs of China's deep carbonate reservoirs acid fracturing, different types of compound ACID FRACTURING TECHNOLOGY is developed：(1)
The compound acid fracturing construction of different acid fluid systems；(2) acid fracturing and the compound construction of waterpower sand fracturing；(3) high enegry gas fracturing with
Very big difference either from technique still inherently all be present in the compound construction of acid fracturing, this 3 kinds of acid fracturing methods.
To realize deep penetration, overcome that high temperature deep well carbonate reservoir acid-rock reaction speed is fast, and acid fracturing effectively stitches length etc.
Problem, domestic and international researcher have carried out substantial amounts of unconventional acid fluid system research, have mainly there is spontaneous acid, viscous acid, emulsified acid
With ground surface crosslinking acid etc., wherein spontaneous acid, which is applied to high temperature well, has the advantages of other acid fluid systems are incomparable.
At present, conventional spontaneous acid system is mainly used in sandstone reservoir acidifying, and the spontaneous compound Acid Fracturing Technology of acid is not yet
Conduct a research and apply in Carbonate Reservoir.
The content of the invention
Exploitation of the present inventor for high temperature deep well carbonate reservoir oil field has carried out many research.This kind of oil field
Carbonate reservoir temperature at 120 DEG C~150 DEG C, depth is 4500m~6500m reservoir.Due to China's high temperature deep well
There are problems that in carbonate reservoir storey increase design, and be difficult to deep penetration：
(1) reservoir temperature is higher, and acid-rock reaction speed is fast, and acid solution deep penetration is limited in one's ability, causes acid-etched fracture effectively to be made
It is shorter with distance, it is impossible to effective communication shaft bottom remotely reservoir, to influence correctional effect；
(2) reservoir buries depth, temperature height, acid filling tubing string length, larger to the corrosion rate of hardware during being pumped into, well
Lower tubular column destroys seriously, and preferably introduces iron ion, produces precipitation infringement stratum.
(3) the compound Acid Fracturing Technology that ripe gel acid and emulsified acid combine realize huge discharge, high pump pressure,
Deep penetrating target, but frictional resistance is higher during infusion emulsified acid, causes well head pump pressure height, and discharge capacity is difficult to improve, bottom-hole treating pressure
It is difficult to the fracture pressure for reaching stratum.
Present invention is generally directed to high temperature deep well carbonate reservoir to bury depth, temperature height, and acid-rock reaction speed is fast, and acid fracturing has
Effect seam length, it is impossible to the effective communication shaft bottom remotely difficult point such as reservoir, carried out by using spontaneous acid system and gelled acid system
Compound acid fracturing method, near wellbore zone flow conductivity is improved, the corrosion rate of hardware is reduced, delays acid-rock reaction speed, reach
Deep penetrating purpose is realized to etching fracture end.
It is used to carry out the spontaneous compound acid fracturing method of acid in high temperature deep well carbonate reservoir specifically, the present invention provides one kind
Technology, injection is replaced with other acid fluid systems by spontaneous acid, while other acid solutions ensure near wellbore zone flow conductivity, pump
The spontaneous acid system entered, which enters behind stratum, gradually occurs chemical reaction generation Hydrochloric Acid Etching rock, solves that acid-rock reaction is too fast asks
Topic, greatly improve and link up the probability away from shaft bottom remotely reservoir hole body, meet the needs of deep penetration etching fracture end, reach
The purpose of high temperature carbonate rock reservoir deep transformation, improve transformation efficiency.
The concrete technical scheme that the present invention uses is a kind of spontaneous sour Compound-acid for high temperature deep well carbonate reservoir
Pressure technique, including following processes：
1) slippery water is injected into stratum by oil pipe；
2) non-crosslinked fracturing fluid is injected into stratum by oil pipe, the non-crosslinked fracturing fluid contains mass percent and is
0.5% non-crosslinked modified xantham gum；
3) spontaneous acid system is injected into stratum by oil pipe, the spontaneous acid composition is：50% spontaneous sour A agent+50%
Spontaneous sour B agent, wherein the percentage is percent by volume, the spontaneous sour A agent is one kind in poly aldehyde material, described
Spontaneous sour B agent is one kind in ammonium salts substances；
4) by oil pipe, into stratum, low discharge capacity injects gelled acid system；
5) slippery water is injected into stratum by oil pipe；
Wherein, process 1), the liquid that 2), 3), 4), 5) is injected accounts for the volume ratio of the injection total liquid in stratum and is respectively：
Process 1) described in slippery water account for as 3-10%, process 2) described in non-crosslinked fracturing fluid account for 40-60%, process 3) described in from
Raw acid system accounts for 30-50%, process 4) described in gelled acid system account for 3-10%, process 5) described in slippery water volume ratio
For 3-15%, wherein volume unit is m3。
The spontaneous compound acid fracturing method of acid of high temperature deep well carbonate reservoir is previously described for, wherein, process 1) in, noted
The slippery water entered forms：The 0.2% non-crosslinked demulsifier of modified xantham gum+0.5% SYNPERONIC PE/F68+
0.1% bactericide formaldehyde+clear water, wherein the percentage is mass percent；It is preferred that the operational discharge capacity of the slippery water be 0~
3.0m3/min。
The spontaneous compound acid fracturing method of acid of high temperature deep well carbonate reservoir is previously described for, wherein, process 2) in, noted
The non-crosslinked fracturing fluid entered forms：The 0.5% non-crosslinked cleanup additive of modified xantham gum+0.5% APES+
The bactericide formaldehyde of 1.0% demulsifier SYNPERONIC PE/F68+0.1%+clear water, wherein the percentage is quality hundred
Divide ratio；It is preferred that the operational discharge capacity of the non-crosslinked fracturing fluid is 3.0~6.5m3/min。
The spontaneous compound acid fracturing method of acid of high temperature deep well carbonate reservoir is previously described for, wherein, process 4) in, noted
The composition of the gelled acid system entered is：The corrosion inhibiter iodine of 20%HCl+0.8% gelling agent modified cations polyacrylamide+2.0%
Change the demulsifier epoxy second of+1.0% ferrous stability ascorbic acid of the cleanup additive of potassium+1.0% APES+1.0%
Alkane epoxy propane copolymer, remaining is water, wherein the percentage is mass percent；It is preferred that the operational discharge capacity of gelled acid system
For 1.0~2.5m3/min。
The spontaneous compound acid fracturing method of acid of high temperature deep well carbonate reservoir is previously described for, wherein, process 5) in, noted
The slippery water entered forms：The 0.2% non-crosslinked demulsifier of modified xantham gum+0.5% SYNPERONIC PE/F68+
0.1% bactericide formaldehyde+clear water, wherein the percentage is mass percent；It is preferred that the operational discharge capacity of the slippery water is 1.5
~2.5m3/min。
The spontaneous compound acid fracturing method of acid of high temperature deep well carbonate reservoir is previously described for, wherein, process 1) and 3) may be used
Alternately repeatedly carry out.
The spontaneous compound acid fracturing method of acid of high temperature deep well carbonate reservoir is previously described for, wherein, process 3) and process
4) process of injection slippery water is also included between, the slippery water composition is：0.2% non-crosslinked modified xantham gum+0.5% is demulsified
The bactericide formaldehyde of agent SYNPERONIC PE/F68+0.1%+clear water, wherein the percentage is mass percent.
The spontaneous compound acid fracturing method of acid of high temperature deep well carbonate reservoir is previously described for, wherein, process 3) in, it is described
The operational discharge capacity of spontaneous acid system is 2.5~7.0m3/min。
Preferably non-crosslinked modified xantham gum system of the invention carries out making seam as prepad fluid and fracturing fluid to reservoir, using certainly
Raw acid system carries out compound acid fracturing method with gelled acid system, improves near wellbore zone flow conductivity, reduces the corrosion of hardware
Speed, delays acid-rock reaction speed, and deep penetration is realized in etching fracture end.The technique improves acid etching EFFECTIVE RANGE and acid fracturing
Make seam efficiency, the probability away from shaft bottom remotely reservoir hole body is linked up in increase.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the spontaneous compound acid fracturing method of acid of the present invention.
Fig. 2 is that spontaneous acid system reacts the acid content graph of a relation after different time at different temperatures.
Fig. 3 is the spontaneous acid that content of hydrochloric acid is 15%, high temperature gel acid, becomes glactaric acid and turn to the acid of sour 4 kinds of acid fluid systems
Lose flow conductivity comparison diagram.
Fig. 4 is TH10270 well acid fracturing construction curve figures.
Embodiment
For high temperature deep well carbonate reservoir, when being constructed using the spontaneous compound Acid Fracturing Technology of acid, it then follows such as
Under well selecting principle：
1. geological conditions：
1) Reservoir Body is less than 150 meters with well distance in geology, and the bar that selected acid fracturing wells are in rich accumulation of oil and gas takes；
2) formation temperature is 90 DEG C of -150 DEG C of carbonate reservoirs.
2. engineering specifications
1) cementing quality is qualified；
2) sleeve pipe is without breakage.
The present invention passes through preferred prepad fluid and fracturing fluid, the preferably spontaneous raw sour raw material of acid, coordinated in high temperature deep well reservoir
Closed acidization technology, it is determined that rational closed-in time and liquid-supplying system, it is compound with gelled acid system to carry out spontaneous acid system
Acid fracturing method, near wellbore zone flow conductivity is improved, the corrosion rate of hardware is reduced, delays acid-rock reaction speed, etching is split
Deep penetration is realized in seam end, reaches and links up the purpose away from shaft bottom remotely reservoir hole body.
The following detailed description of the spontaneous compound acid fracturing method of acid for high temperature deep well carbonate reservoir of the present invention, to explain
State the feature of the method applied in the present invention and prove the effect of the present invention.
High temperature deep well carbonate reservoir, which exists, buries depth, temperature height, and acid-rock reaction speed is fast, and acid fracturing effectively stitches length,
Be unable to effective communication shaft bottom remotely reservoir the problems such as.In order in high temperature deep well carbonate reservoir simultaneously realize deep penetration and
High flow conductivity, the present inventor are studied the spontaneous compound acid fracturing method of acid from many aspects in Oil Field.
1st, preferably prepad fluid and fracturing fluid
Noncrosslinking modified xantham gum fracturing fluid has preferable width generation capacity, and frictional resistance is relatively low, and is slided with 0.45% guar gum
Slip that water price lattice are close, thus in the technique from 0.2% and 0.5% non-crosslinked modified xantham gum system as prepad fluid and pressure
Liquid is split reservoir is carried out to make seam.
As the guanidine glue commonly used in pressure break, xanthans is also a kind of natural plant gum, is fermented by sarson Xanthomonas campestris
" pentasaccharides repeat unit " biopolymer arrived is xanthans, and different anionic group (carboxylic acids is introduced on xanthan molecules
Base, sulfonic group) and the modified xantham gum that is formed afterwards in this technology of cation group (quaternary ammonium salt base).Non-crosslinked modified xantham gum body
System refers to not add crosslinking agent in solution.
2nd, the selection gist of spontaneous acid system
As shown in Figures 2 and 3, Fig. 2 is that spontaneous acid system reacts the acid content relation after different time at different temperatures
Figure, Fig. 3 are the spontaneous acid that content of hydrochloric acid is 15%, high temperature gel acid, become glactaric acid and turn to the acid etching water conservancy diversion of sour 4 kinds of acid fluid systems
Ability comparison diagram.
As can be seen from Figure 2, under Time constant, system acid concentration first increases sharply with temperature rise, tends to be flat after 130 DEG C
It is slow；At a constant temperature, acid concentration extends with the reaction time and gradually risen, and acid concentration no longer occurs larger with the time after 150 DEG C
Change.Acid-rock reaction speed should be delayed, produce effective acid-etched fracture length again, and there is certain fracture guide energy
Power, realizes Depth Acid Fracturing truly, and spontaneous acid system need to be in 0.5h with certain acid concentration, while again can not be
Very high acid concentration (5% is produced in 0.5h<Acid concentration during 0.5h<18%).From data in Fig. 2, spontaneous acid system is applicable
In the reservoir (120 DEG C~150 DEG C of temperature reservoirs) that temperature is 90 DEG C~150 DEG C, the purpose of Depth Acid Fracturing can reach.
From figure 3, it can be seen that when clossing pressure is less than 20MPa, spontaneous acid system flow conductivity is higher than other acid fluid systems；Close
After resultant pressure is higher than 20MPa, spontaneous acid system flow conductivity higher than change glactaric acid and turns to sour body less than high temperature gelled acid system
System.Showing spontaneous acid system, acid etching flow conductivity is preferable on the whole.
3rd, preferably spontaneous sour raw material
By in three kinds of the hydrolysis of chloro hydrocarbon derivative, chloride compounds hydrolysis and reaction of carbonyls and metal salt etc.
Tested and screened in technical scheme, final choice high polymerization degree carbonyls and salt as spontaneous sour raw material,
Reach and do not chemically reacted substantially on ground, gradually reaction generates hydrochloric acid under the conditions of stratum high-temperature, etching fracture end
Purpose.
4th, closed-in time and the liquid-supplying system of compound Acid Fracturing Technology are determined
Use for reference the reservoir temperature of construction early stage well, return discharge opeing pH value and closed-in time, according to the reservoir temperature of pre- construction well
It is determined that the rational closed-in time makes spontaneous acid system react completely in the earth formation.Because spontaneous acid formula is extemporaneous preparation A, B agent
Semi-finished product, to ensure that scene is realized according to 1:1 ratio is injected, and is carried out in construction technology using double liquid supply vehicles, independent liquid-supplying system
The live infusion of spontaneous acid system.
Wherein, supervised according to discharge opeing pH value after Tarim Basin middle ancient times I wells (147 DEG C of formation temperature) spontaneous sour field test pressure
Survey situation determines the rational closed-in time.Middle ancient times I well closing well 135min (14:45 terminations of pumping, 17:00 drives a well) after to return discharge opeing pH value equal
For 6, the reaction completely of spontaneous acid.In view of the well formation temperature is higher than this well (139 DEG C of this well formation temperature), the optimization closed-in time is true
It is set to 180min.
4th, fitting closure Acidizing Process Technique
Different types of acid fluid system is injected in technique and carries out compound acid fracturing, to ensure the flow conductivity of near wellbore zone, is applied
The gelled acid system that work later stage low discharge capacity is pumped into certain volume carries out closed acidization.
According to above result of study, it is multiple that the present invention provides a kind of following spontaneous acid for high temperature deep well carbonate reservoir
Close acid fracturing method.
Specifically, as shown in figure 1, the compound acid fracturing work of spontaneous acid for high temperature deep well carbonate reservoir of the present invention
Skill, including following processes：
Process 1)：Inject slippery water
Slippery water is injected into stratum when constructing and starting, controls the discharge capacity of slippery water in 0~3.0m3/ min, preferably rank
The step of ladder puies forward discharge capacity, and discharge capacity is incremented by with step, and specific ladder puies forward discharge capacity be：Inject the initial displacement of slippery water for 0~
1.5m3/ min, after 2/3rds high frictional resistance well killing fluids are squeezed into stratum in pit shaft, make discharge capacity step be incremented to 1.5~
3.0m3/ min, pump pressure situation is watched from the measuring truck of job site, estimate that bottom hole fracturing pressure (BHFP), locality lamination stop carrying after opening
Discharge capacity, discharge capacity is kept in 3.0m3/min。
0~1.5m of slippery water3/ min stage discharge capacities, main function are slowly to squeeze into ground by high frictional resistance well killing fluid in pit shaft
Layer, well head pressure is reduced, being advantageous to the later stage puies forward discharge capacity and press off stratum；Later stage improves discharge capacity to 1.5~3.0m3/ min, it is gradual
Discharge capacity is put forward to press off stratum, then, implements the spontaneous sour compound acidfracturing treatment of gel acid, can be formed spontaneous acid fracturing artificial
Crack extends forward.
Wherein, the composition of the slippery water is：The non-crosslinked bactericide of modified xantham gum system+0.1% of clear water+0.2%+
0.5% demulsifier, wherein the percentage is mass percent.
Clear water described here can be oil field content of mineral substances qualified clear water up to standard, its K+、Na+Deng monovalent ion
Content is less than 5000mg/L, Ca2+、Mg2+It is less than 100mg/L Deng divalent ion content.
Every those reagents as bactericide, demulsifier commonly used in the art are used equally in the present invention, for example, sterilization
Agent can be in formaldehyde, glutaraldehyde, quaternary ammonium salt (dodecyl benzyl dimethyl ammonium chloride), two bromo- 3- nitrilo-s propionamides
A kind of or compound, demulsifier can be in polyoxyethylene polyoxypropylene block copolymer, SYNPERONIC PE/F68
One kind or compound.
The volume ratio that the volume of the slippery water of process injection accounts for the injection total liquid in stratum is 3~10%, wherein volume
Unit is m3。
Process 2)：Inject the process of non-crosslinked fracturing fluid
Non-crosslinked fracturing fluid is injected into formation fracture, operational discharge capacity scope is 3.0~6.5m3/min；Wherein, it is described non-
Crosslinked fracturing fluid forms：The 0.5% non-crosslinked bactericide of+1.0% demulsifier of the cleanup additive of modified xantham gum+0.5%+0.1%, its
Yu Weishui, wherein the percentage is mass percent.
Every those reagents as cleanup additive, bactericide, demulsifier commonly used in the art are used equally in the present invention, example
Such as, bactericide can be formaldehyde, glutaraldehyde, one kind in quaternary ammonium salt (dodecyl benzyl dimethyl ammonium chloride) or compound,
Demulsifier can be polyoxyethylene polyoxypropylene block copolymer, one kind in SYNPERONIC PE/F68 or compound
Thing, cleanup additive can be fluorine carbon surfactant, one kind in APES or compound.
The volume ratio that the volume of the non-crosslinked fracturing fluid of process injection accounts for the injection total liquid in stratum is 40%~60%,
Wherein volume unit is m3。
Non-crosslinked fracturing fluid is injected into formation fracture, seam and vee crack extension can be made.
Process 3)：Inject the process of spontaneous acid system
Spontaneous acid system is injected into formation fracture, operational discharge capacity scope is 2.5~7.0m3/min；Wherein, injected
Spontaneous acid, which forms, is：The 50% spontaneous sour spontaneous sour B agent of A agent+50%, wherein the percentage is percent by volume.
Spontaneous sour A agent is poly aldehyde material, selected from poly- dimethylaminobenzaldehyde, poly- six aldehyde, paraformaldehyde, Metaldehyde
In any one, spontaneous sour B agent is ammonium salts substances, in chlorination ammonium salt, dimethyl diallyl ammonium chloride salt etc.
Any one.
By spontaneous acid system with 2.5m3/ min operational discharge capacity injection stratum, (pump is reduced in specific well head pump pressure without obvious
Pressure fluctuation is less than 5MPa) in the case of, acid solution discharge capacity is gradually stepped up to 5.0~7.0m3/ min, delay acid-rock reaction speed, increase
Add acid-etched fracture distance, ditch as far as possible has led to crack, solution cavity etc. favorable reservoir body, and fracture end performs etching, and realizes
Deep penetration, reach the purpose for building production；In 5.0~7.0m3After a certain amount of acid solution is injected under/min discharge capacity, it is big to there is well head pump pressure
Width reduces (pump pressure decreasing value is more than 10MPa), in order to avoid acid solution is in the excessive leak-off of the favorable reservoir body such as crack or solution cavity, drop
Low discharge capacity is to 3.5~4.0m3/ min so that acid solution is reacted with rock in man-made fracture, improves whole man-made fracture flow conductivity；
When acid solution Residual liquid is less than 20~40m3When, cause construction to stop to avoid the discharge capacity fracturing car group from sucking air, therefore drop
Low acid solution discharge capacity is to 2.5~3.5m3/ min, meet that acid solution supply requires.
The volume ratio that the volume of the spontaneous acid system of process injection accounts for the injection total liquid in stratum is 30%-50%, its
Middle volume unit is m3。
Process 4)：Inject the process of gelled acid system
Gelled acid system is injected into stratum, operational discharge capacity scope is 1.0~2.5m3/min。
Injecting glue coagulates acid phase, according to the pressure condition of specific well, in the case where that can reach the requirement of closed acidization technique, this process
In can be carried using ladder discharge capacity injection acid fluid system.The step of specific ladder puies forward discharge capacity be：Injection gel acid initial displacement be
1.0~1.5m3/ min, from the measuring truck of job site from be pumped, the well bottom pressure is estimated, when bottom pressure value is far below
During (being more than 5MPa) the well fracture closure pressure, discharge capacity step is set to be incremented to 1.5~2.5m3/ min, when bottom pressure value is omited
Stop putting forward discharge capacity during less than (in the range of 1~2MPa) the well fracture closure pressure, keep discharge capacity in 2.5m3/min。
It is for net pressure in reduction man-made fracture to use low discharge capacity acid filling, lures that man-made fracture slowly closes into, thus can be real
Closed acidization technique is applied, improves near wellbore zone flow conductivity.
Wherein, as long as acid solution of the acid solution injected with etching rock, raising flow conductivity is used equally for this process,
Wherein, the sour composition in the acid solution can be in hydrochloric acid, low concentration hydrofluoric acid (mass percent 2%), acetic acid, phosphoric acid
A kind of or Compound-acid, preferably hydrochloric acid；Sour composition in acid solution is the hydrochloric acid that mass percent is 15%~20%.Present invention injection
The preferred gel acid of acid solution, consisting of：The iron of+1.0% cleanup additive of+2.0% corrosion inhibiter of 20%HCl+0.8% gelling agents+1.0%
The demulsifier of ion stabilizer+1.0%, remaining is water, wherein the percentage is mass percent.
Every those examinations for being used as gelling agent, cleanup additive, demulsifier, corrosion inhibiter and ferrous stability commonly used in the art
Agent is used equally in the present invention.For example, gelling agent can be modified cation polyacrylamide, it is ethylene, propylene analog copolymer, poly-
N- vinylpyrrolidones, one kind in AMPS/AM/DMAM copolymers or compound, corrosion inhibiter can be Mancini alkali, imidazoline
Doped quaternary ammonium salt, lauryl aldehyde, containing one kind or compound in alkyl pyridinium compounds, aldehyde ketone amine condensation product, KI, alkynol, iron from
Sub- stabilizer can be ascorbic acid, edta and its sodium salt, citric acid, acetic acid, nitrilotriacetic acid, ascorbic acid phosphorus
One kind or compound in sour fat sodium, demulsifier can be polyoxyethylene polyoxypropylene block copolymer, oxirane epoxy third
One kind or compound in alkyl copolymer, cleanup additive can be one in fluorine carbon surfactant, APES
Kind or compound.
The volume ratio that the volume of the gelled acid system of process injection accounts for the injection total liquid in stratum is 3%-10%, wherein
Volume unit is m3。
In order that acid solution further performs etching to distal end crack, deep penetration effect is increased, in process 3) after, process 1)
With process 3) can be alternately.
In process 3) and 4) between can re-inject process 1) in slippery water, by process 3) in spontaneous acid system top
Enter stratum more deep, further distal end crack is performed etching, increase deep penetration effect.Preferably, the construction of the slippery water
Discharge capacity is 2~3.0m3/ min, the volume ratio that the slippery water injected accounts for the injection total liquid in stratum are 3~10%.
Process 5)：Inject the process of slippery water
Slippery water is injected into stratum, operational discharge capacity scope is 2.5~1.5m3/min；Wherein, process injection is smooth
Water and process 1) in injection slippery water composition it is identical, consisting of：Oil field content of mineral substances qualified clear water up to standard+
The 0.2% non-crosslinked demulsifier of+0.1% bactericide of modified xantham gum system+0.5%.
Clear water described here can be oil field content of mineral substances qualified clear water up to standard, its K+、Na+Deng monovalent ion
Content is less than 5000mg/L, Ca2+、Mg2+It is less than 100mg/L Deng divalent ion content.
Every those reagents as bactericide, demulsifier commonly used in the art are used equally in the present invention, for example, sterilization
Agent can be in formaldehyde, glutaraldehyde, quaternary ammonium salt (dodecyl benzyl dimethyl ammonium chloride), two bromo- 3- nitrilo-s propionamides
A kind of or compound, demulsifier can be in polyoxyethylene polyoxypropylene block copolymer, SYNPERONIC PE/F68
One kind or compound.
Note the slippery water stage, from start note slippery water to slippery water surplus be 5m3Time in, with 2.1m3/ min perseverance
Fixed displacement injects slippery water, and main function is that the acid fluid system that is gelled in pit shaft is headed into stratum, first, acid liquid corrosion tubing string is prevented,
Second, making full use of acid solution, allow all acid solutions to enter reservoir etching rock and improve nearly well band flow conductivity.When slippery water is remaining
Amount is less than 5m3Afterwards, discharge capacity is reduced to 1.4~1.6m3/ min is to prevent high discharge capacity fracturing car group suction air from causing construction to stop
Only.
The volume ratio that the volume of the slippery water of process injection accounts for the injection total liquid in stratum is 3~15%, wherein volume
Unit is m3。
Stop infusion, survey record pump pressure decreasing value.
In addition, in order to reduce construction friction, 3 1/2 are used under conditions of operating tool string intensity requirement is met, during construction "
Large diameter oil pipe, such as 3 1/2 " EUE external upset tubings/3 1/2 " TP-JC oil pipes can be used；Ensureing tubing string safety simultaneously
On the premise of, as far as possible reduce tripping in oil pipe length.
Below, enumerate embodiment to further describe the present invention, but the present invention is not limited to following embodiments.
Embodiment
Stored up below by way of the field test to system in Tahe Oilfield to describe the high temperature deep well carbonate rock that is used for of the present invention in detail
The spontaneous compound acid fracturing method of acid of layer.
Carry out the acid fracturing construction (secrecy experiment) of the spontaneous compound Acid Fracturing Technology of acid to system in Tahe Oilfield TH10270 wells
Involved liquid composition is as follows during acid fracturing construction infusion, and following percentage unless otherwise instructed, refers both to
Quality %.
Slippery water：The model ZX-34 sold using Beijing Century culminant star Enertech Co., Ltd. modified xantham gum
And additive, consisting of：0.2%+0.1% bactericide of modified xantham gum ZX-34+0.5%ZX-11 demulsifiers+clear water.
Non-crosslinked fracturing fluid：The model ZX-34 sold using Beijing Century culminant star Enertech Co., Ltd. modification
Xanthans and additive, consisting of：0.5% modified xantham gum ZX-34+0.5% cleanup additive ZX-07+1.0% demulsifiers ZX-
11+0.1% bactericide+clear water.
Spontaneous acid：The spontaneous acid system of Beijing Century culminant star Enertech Co., Ltd., consisting of：50% spontaneous sour A
The spontaneous sour B agent ZX-339 of agent ZX-368+50%, wherein, ZX-368 is paraformaldehyde, and ZX-339 is chlorination ammonium salt.
Gel acid：The gelled acid system of Sichuan beidellite oil tech Development Co., Ltd, consisting of：20%HCl+
0.8%BD1-6B gelling agent+2.0%BD1-20 corrosion inhibiter+1.0%BD1-5 cleanup additive+1.0%BD1-2 ferrous stabilities+
1.0%BD1-3 demulsifiers, remaining is water.
It is every commonly used in the art to be used as gelling agent, demulsifier, bactericide, cleanup additive, iron in addition, it is necessary to explanation
Those reagents of ion stabilizer, corrosion inhibiter are used equally in the application.For example, gelling agent can be modified cation polypropylene
Acid amides, ethylene, propylene analog copolymer, poly- N- vinylpyrrolidones, one kind or compound in AMPS/AM/DMAM copolymers, delay
Lose agent can be Mancini alkali, imidazoline doped quaternary ammonium salt, lauryl aldehyde, containing alkyl pyridinium compounds, aldehyde ketone amine condensation product, KI,
One kind or compound in alkynol, ferrous stability can be ascorbic acid, edta and its sodium salt, citric acid,
Acetic acid, nitrilotriacetic acid, one kind in ascorbic acid phosphate ester sodium or compound, demulsifier can be polyoxyethylene polyoxypropylene
One kind or compound in block copolymer, SYNPERONIC PE/F68, cleanup additive can be fluorine carbon surface-active
One kind or compound in agent, APES.
Specifically, the working procedure that the spontaneous compound acid fracturing method of acid is carried out to TH10270 wells is：
One room group 5713.16-5803.00m well section of the TH10270 wells Ordovician system carries out the spontaneous compound Acid Fracturing Technology of acid
Acid fracturing is constructed.Fig. 4 is TH10270 well acid fracturing construction curve figures.Squeeze into the total liquid measure 686.5m in stratum3(wherein sequentially add smooth
Water 25m3, non-crosslinked fracturing fluid 356.5m3, spontaneous sour 270m3, gel acid 30m3, slippery water 30m3).Discharge capacity is first carried using ladder
Process injection 25m3Slippery water：1.2m3/ min discharge capacity the stages note slippery water and slowly squeeze into high frictional resistance well killing fluid in pit shaft
Stratum, well head pressure is reduced, the later stage gradually steps up discharge capacity to 1.8m3/ min presses off stratum；Then with 5.2~6.3m3/ min's
Operational discharge capacity injects 356.5m3Non-crosslinked fracturing fluid：First according to simulation fracture development length and fracture height in detail design, by
Discharge capacity is gradually improved to 5.2m3/ min observation well head pump pressures and fracture extension situation, (well head is pumped in well head pump pressure claimed range
It is required that≤79MPa), discharge capacity is improved to 5.2m3/ min, observation well head pump pressure is 71MPa, then discharge capacity is improved to 6.3m3/ min after
Continuous observation, reaching well head pump pressure design requirement, (well head pump pressure design requirement is≤79MPa, and discharge capacity is improved to 6.3m3During/min
Pump pressure reached 78.5MPa) after stablize the discharge capacity to vee crack extend.
With 5.6~2.5m3/ min operational discharge capacity injection 270m3Spontaneous sour fracture end performs etching：Acid solution is just injected
Behind stratum, in the case of well head pump pressure is without obvious reduce, acid solution discharge capacity is just gradually stepped up to 5.6m3/ min, increase acid etching split
Distance is stitched, ditch as far as possible has led to crack, solution cavity etc. favorable reservoir body, reached the purpose for building production；Injected under high discharge capacity
200m3Acid solution after, occur well head pump pressure be greatly reduced, in order to avoid acid solution is in the excess of the favorable reservoir body such as crack or solution cavity
Leak-off, discharge capacity is reduced to 3.5m3/ min so that acid solution is reacted with rock in man-made fracture, improves whole man-made fracture water conservancy diversion energy
Power；To the construction later stage when acid solution Residual liquid is less than 30m3When, cause to construct to avoid high discharge capacity fracturing car group from sucking air
Stop, therefore reduce acid solution discharge capacity to 2.5m3/ min, meet that acid solution supply requires.
Ladder is used to put forward the mode of discharge capacity with 2.1m3/ min low discharge capacity injection 30m3Gelled acid system, reduce man-made fracture
Interior net pressure, lure that man-made fracture slowly closes into, carry out closed acidization and improve near wellbore zone flow conductivity；Finally with 2.1~
1.6m3/ min operational discharge capacity injection 30m3Slippery water：Early stage is with 2.1m3/ min discharge capacity is by the acid fluid system top of being gelled in pit shaft
Enter stratum, prevent acid liquid corrosion tubing string, and make full use of acid solution, allow all acid solutions to enter reservoir etching rock and improve nearly well band
Flow conductivity, later stage are less than 5m when slippery water surplus3Afterwards, discharge capacity is reduced to 1.6m3/ min is to prevent high discharge capacity fracturing car
Group suction air causes construction to stop.
Casing pressure is always 0 during spontaneous acid is noted in work progress, shows have obvious Reservoir Body of linking up to show.Termination of pumping pressure measurement is dropped
After determine that the rational closed-in time is 3h.
Daily output liquid 58.2m at initial stage after pressure3/ d, it is not aqueous.Long 98.1m is stitched in the design of TH10270 wells, and acid etching stitches long 87.2m, pressure
Site operation parameter input fracturing model is obtained into the long 100.9m of actual seam afterwards, acid etching stitches long 89.7m；The average flow conductivity of design
89.3mdm, actual average flow conductivity 141.9mdm.Reservoir deep penetration effect is more apparent after showing this acid fracturing, manually
Distal end fracture condudtiviy is improved in crack.
Obviously, those skilled in the art can carry out the spirit of various changes and modification without departing from the present invention to invention
And scope.So, if these modifications and variations of the present invention belong to the claims in the present invention and its equivalent technologies scope it
Interior, then the present invention is also intended to comprising including these changes and modification.
Claims (9)
1. a kind of spontaneous compound acid fracturing method of acid for high temperature deep well carbonate reservoir, including following processes：
1) slippery water is injected into stratum by oil pipe；
2) non-crosslinked fracturing fluid is injected into stratum by oil pipe, the non-crosslinked fracturing fluid contains mass percent for 0.5%
Non-crosslinked modified xantham gum；
3) spontaneous acid system is injected into stratum by oil pipe, the composition of the spontaneous acid system is：50% spontaneous sour A agent+
50% spontaneous sour B agent, wherein the percentage is percent by volume, the spontaneous sour A agent is one kind in poly aldehyde material,
The spontaneous sour B agent is one kind in ammonium salts substances；
4) by oil pipe, into stratum, low discharge capacity injects gelled acid system；
5) slippery water is injected into stratum by oil pipe；
Wherein, process 1), the liquid that 2), 3), 4), 5) is injected accounts for the volume ratio of the injection total liquid in stratum and is respectively：Process
1) slippery water described in is accounted for as 3~10%, process 2) described in non-crosslinked fracturing fluid account for 40~60%, process 3) described in it is spontaneous
Acid system accounts for 30~50%, process 4) described in gelled acid system account for 3~10%, process 5) described in slippery water volume ratio
For 3~15%, wherein volume unit is m3；
Wherein, the high temperature deep well carbonate reservoir is temperature at 120 DEG C~150 DEG C, and depth is 4500m~6500m storage
Layer；
Wherein, the process 1) in, the slippery water composition injected is：The 0.2% non-crosslinked demulsifier of modified xantham gum+0.5%
The bactericide of SYNPERONIC PE/F68+0.1% formaldehyde+clear water, wherein the percentage is mass percent；
Wherein, the process 2) in, the non-crosslinked fracturing fluid composition injected is：0.5% non-crosslinked modified xantham gum+0.5%
The bactericide formaldehyde of+1.0% demulsifier SYNPERONIC PE/F68 of cleanup additive APES+0.1%+clear
Water, wherein the percentage is mass percent.
2. the spontaneous compound acid fracturing method of acid according to claim 1 for high temperature deep well carbonate reservoir, its feature
It is, the operational discharge capacity of the slippery water is 0~3.0m3/min。
3. the spontaneous compound acid fracturing method of acid according to claim 1 or 2 for high temperature deep well carbonate reservoir, it is special
Sign is that the operational discharge capacity of the non-crosslinked fracturing fluid is 3.0~6.5m3/min。
4. the spontaneous compound acid fracturing method of acid according to claim 1 or 2 for high temperature deep well carbonate reservoir, it is special
Sign is, the process 4) in, the composition of the gelled acid system injected is：20%HCl+0.8% gelling agent modified cations
The ferrous stability of+1.0% cleanup additive APES of the corrosion inhibiter of polyacrylamide+2.0% KI+1.0% resists
The demulsifier SYNPERONIC PE/F68 of bad hematic acid+1.0%, remaining is water, wherein the percentage is mass percent；
The operational discharge capacity of gelled acid system is 1.0~2.5m3/min。
5. the spontaneous compound acid fracturing method of acid according to claim 1 or 2 for high temperature deep well carbonate reservoir, it is special
Sign is, the process 5) in, the slippery water composition injected is：The 0.2% non-crosslinked demulsifier of modified xantham gum+0.5% ring
The bactericide formaldehyde of oxidative ethane epoxy propane copolymer+0.1%+clear water, wherein the percentage is mass percent；It is described smooth
The operational discharge capacity of water is 1.5~2.5m3/min。
6. the spontaneous compound acid fracturing method of acid according to claim 1 or 2 for high temperature deep well carbonate reservoir, it is special
Sign is, the process 1) and process 3) alternately can repeatedly carry out.
7. the spontaneous compound acid fracturing method of acid according to claim 1 or 2 for high temperature deep well carbonate reservoir, it is special
Sign is, the process 3) and process 4) between also include the process of injection slippery water, the slippery water composition is：0.2% is non-
The cross-linking modified bactericide formaldehyde of the demulsifier of xanthans+0.5% SYNPERONIC PE/F68+0.1%+clear water, wherein institute
It is mass percent to state percentage.
8. the spontaneous compound acid fracturing method of acid according to claim 1 or 2 for high temperature deep well carbonate reservoir, it is special
Sign is, the process 3) in, the operational discharge capacity of spontaneous acid system is 2.5~7.0m3/min。
9. the spontaneous compound acid fracturing method of acid according to claim 1 or 2 for high temperature deep well carbonate reservoir, it is special
Sign is, process 3) and 4) between can re-inject slippery water, the slippery water composition is：0.2% non-crosslinked modified xanthan
The bactericide formaldehyde of the demulsifier of glue+0.5% SYNPERONIC PE/F68+0.1%+clear water, wherein the percentage is matter
Measure percentage；The operational discharge capacity of the slippery water is 2~3.0m3/ min, the slippery water injected account for the injection total liquid in stratum
Volume ratio is 3~10%.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3828854A (en) * | 1973-04-16 | 1974-08-13 | Shell Oil Co | Dissolving siliceous materials with self-acidifying liquid |
| US7581594B2 (en) * | 2006-03-15 | 2009-09-01 | Chemeor, Inc. | Surfactant method for improved oil recovery from fractured reservoirs |
| CN102022105A (en) * | 2010-10-21 | 2011-04-20 | 中国石油化工股份有限公司 | Large composite acid fracturing method of fracture cave type carbonate rock reservoir |
| CN102399550A (en) * | 2011-01-27 | 2012-04-04 | 中国石油天然气股份有限公司 | Liquid formula used for in-depth acidification of high temperature carbonate rock |
| CN102899012A (en) * | 2012-11-14 | 2013-01-30 | 北京世纪中星能源技术有限公司 | Self-born acid and preparation method and application thereof |
| CN103361042A (en) * | 2012-08-29 | 2013-10-23 | 北京世纪中星能源技术有限公司 | Xanthan gum non-crosslinking fracturing fluid as well as preparation method and application thereof |
| CN103450872A (en) * | 2012-05-28 | 2013-12-18 | 中国石油天然气股份有限公司 | Authigenic acid system and its application |
| RU2547850C2 (en) * | 2013-05-06 | 2015-04-10 | Открытое акционерное общество "Нефтяная компания "Роснефть" | Large-volume selective acid treatment (lvsat) for producers in carbonate reservoirs |
| CN104564002A (en) * | 2014-12-16 | 2015-04-29 | 中国石油化工股份有限公司 | Pumping stop sand setting fracture-height-controlling acid fracturing process method applicable to carbonate reservoir |
-
2015
- 2015-06-18 CN CN201510342102.6A patent/CN104975840B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3828854A (en) * | 1973-04-16 | 1974-08-13 | Shell Oil Co | Dissolving siliceous materials with self-acidifying liquid |
| US7581594B2 (en) * | 2006-03-15 | 2009-09-01 | Chemeor, Inc. | Surfactant method for improved oil recovery from fractured reservoirs |
| CN102022105A (en) * | 2010-10-21 | 2011-04-20 | 中国石油化工股份有限公司 | Large composite acid fracturing method of fracture cave type carbonate rock reservoir |
| CN102399550A (en) * | 2011-01-27 | 2012-04-04 | 中国石油天然气股份有限公司 | Liquid formula used for in-depth acidification of high temperature carbonate rock |
| CN103450872A (en) * | 2012-05-28 | 2013-12-18 | 中国石油天然气股份有限公司 | Authigenic acid system and its application |
| CN103361042A (en) * | 2012-08-29 | 2013-10-23 | 北京世纪中星能源技术有限公司 | Xanthan gum non-crosslinking fracturing fluid as well as preparation method and application thereof |
| CN102899012A (en) * | 2012-11-14 | 2013-01-30 | 北京世纪中星能源技术有限公司 | Self-born acid and preparation method and application thereof |
| RU2547850C2 (en) * | 2013-05-06 | 2015-04-10 | Открытое акционерное общество "Нефтяная компания "Роснефть" | Large-volume selective acid treatment (lvsat) for producers in carbonate reservoirs |
| CN104564002A (en) * | 2014-12-16 | 2015-04-29 | 中国石油化工股份有限公司 | Pumping stop sand setting fracture-height-controlling acid fracturing process method applicable to carbonate reservoir |
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