CN107130952A - A kind of three-level composite petroleum method for increasing - Google Patents
A kind of three-level composite petroleum method for increasing Download PDFInfo
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- CN107130952A CN107130952A CN201610107765.4A CN201610107765A CN107130952A CN 107130952 A CN107130952 A CN 107130952A CN 201610107765 A CN201610107765 A CN 201610107765A CN 107130952 A CN107130952 A CN 107130952A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000002131 composite material Substances 0.000 title claims abstract description 5
- 239000003208 petroleum Substances 0.000 title claims abstract description 5
- 239000002253 acid Substances 0.000 claims abstract description 124
- 239000004576 sand Substances 0.000 claims abstract description 51
- 239000011435 rock Substances 0.000 claims abstract description 46
- 230000007797 corrosion Effects 0.000 claims abstract description 45
- 238000005260 corrosion Methods 0.000 claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 claims abstract description 44
- 238000002474 experimental method Methods 0.000 claims abstract description 37
- 239000011159 matrix material Substances 0.000 claims abstract description 37
- 238000013329 compounding Methods 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims description 20
- 238000012360 testing method Methods 0.000 claims description 20
- 238000011156 evaluation Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000005530 etching Methods 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- HJUFTIJOISQSKQ-UHFFFAOYSA-N fenoxycarb Chemical compound C1=CC(OCCNC(=O)OCC)=CC=C1OC1=CC=CC=C1 HJUFTIJOISQSKQ-UHFFFAOYSA-N 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 4
- 239000011229 interlayer Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 28
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- 238000005516 engineering process Methods 0.000 description 13
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- 238000004088 simulation Methods 0.000 description 10
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
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- 230000008901 benefit Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
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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
-
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
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Abstract
The present invention relates to a kind of three-level composite petroleum method for increasing, comprise the following steps：1) choose rock core sample and carry out sour corrosion rate experiment, acid corrosion fracture experiment and the fracture condudtiviy experiment for laying proppant, sour corrosion rate is measured by the experiment of sour corrosion rate, the fracture condudtiviy experiment that proppant is tested and laid by acid corrosion fracture measures flow conductivity parameter respectively, and based on the flow conductivity parameter measured come forecast production, if sour corrosion rate is more than 20%, and the yield predicted reaches predetermined value, then selection carries out acid fracturing, waterpower sand fracturing and matrix acidifying three-level method for increasing production by compounding；2) according to first acid fracturing, again waterpower sand fracturing, the order of last matrix acidifying carries out acid fracturing, waterpower sand fracturing and matrix acidifying oil output respectively.
Description
Technical field
The present invention relates to a kind of method for increasing, more particularly to a kind of method for increasing of oil field.
Background technology
Current method for increasing mainly includes three kinds of matrix acidifying, acid fracturing and waterpower sand fracturing.In general,
Matrix acidifying is mainly used in sandstone and carbonate rock, and (sandstone or carbonate rock are usually that permeability is high, pollute high
That), acid fracturing is mainly used in carbonate rock (permeability is low or needs acid etching slit to link up different Reservoir Bodies),
And hydraulic fracturing is mainly used in sandstone, and other untraditional reservoirs, such as shale gas, shale oil, coal seam
Gas and hot dry rock etc..
But, there are following problems in current yield-increasing technology：
(1) technology species is single.Current yield-increasing technology still based on single water conservancy pressure break or acid fracturing,
Matrix acidifying is used to apply before hydraulic fracturing technology by scene sometimes, and its purpose is only that acid bubble pit shaft pollution is stifled
Plug thing, and then reduce the fracture pressure of reservoir rock.In addition, matrix acidifying is also used for ACID FRACTURING TECHNOLOGY sometimes, but
Multistage injection acid fracturing -- closed acidization technology is only limitted to, and during execute-in-place, only by simply reducing a little discharge capacities
With the viscosity of acid solution, closed acidization is not realized really in most cases.Yet there are no system, it is efficient
Three-level increasing production by compounding technology is proposed.
(2) species and single property of fracturing fluid and acid solution.When scene carries out pressure break or acid fracturing, overall process is only
The optimization of liquid is carried out by a kind of temperature, a kind of formula, is not accounted in the progress with pressure break or acid fracturing, crack
Temperature field be the fact that gradually reduce, so that easily extra injury is caused to reservoir, while also larger journey
Add pressure break or the cost of acid fracturing degree.
(3) pressure break or acid fracturing construction parameter are single.As in most cases carried out using invariable discharge capacity
Construction, does not account for the storage barrier stress state on stratum and the situation of extension up and down of fracture height etc..
Therefore, this area needs a kind of new yield-increasing technology badly, to realize the target of " cost efficiency " to greatest extent.
Under current low oil price background, the meaning of cost efficiency is more great.
The content of the invention
In order to solve above-mentioned problems of the prior art, the present invention proposes a kind of compound increasing of brand-new three-level
The technical thought of production method, takes full advantage of the technical advantage of acid fracturing, waterpower sand fracturing and matrix acidifying three,
Realize especially good effect of increasing production.
It is an advantage of the invention to provide a kind of three-level composite petroleum method for increasing, comprise the following steps：
1) rock core sample is chosen to carry out sour corrosion rate experiment, acid corrosion fracture experiment and lay proppant
Fracture condudtiviy experiment, by sour corrosion rate experiment measure sour corrosion rate, pass through acid corrosion fracture
Experiment and the fracture condudtiviy experiment of laying proppant measure flow conductivity parameter respectively, and based on leading for measuring
Stream ability parameter carrys out forecast production,
If sour corrosion rate is more than 20%, and the yield predicted reaches predetermined value, then selection carries out acid fracturing, waterpower
Sand fracturing and matrix acidifying three-level method for increasing production by compounding；
2) according to first acid fracturing, again waterpower sand fracturing, the order of last matrix acidifying carries out acid fracturing, water respectively
Power sand fracturing and matrix acidifying oil output.
One of the present invention preferred embodiment in, the present invention is selected according to fracture condudtiviy experimental result
Select the increasing production by compounding type of skill.The present invention proposes to equal sour corrosion rate and corresponding acid corrosion fracture
Row experiment, and the flow conductivity contrast experiment that agent is laid is supported again to the experiment sample of acid-etched fracture guide,
Production forecast is carried out by experimental result, on the premise of expected volume is met, select single pressure break, two grades or three
Level Technology of Compound Fracturing type.Specifically, if sour corrosion rate is more than 20%, and the yield predicted reach it is predetermined
Value, then selection carries out acid fracturing, waterpower sand fracturing and matrix acidifying three-level method for increasing production by compounding.
In the present invention, it is determined that in method for increasing production by compounding acid fracturing, waterpower sand fracturing and matrix acidifying these three
The tandem of step.Present invention determine that this is sequentially acid fracturing preceding, waterpower sand fracturing is in centre, acidifying
Posterior three-level method for increasing production by compounding.Inventors hereof have unexpectedly found that, it can sequentially be taken using this
Obtain especially good effect.Reason is：
The Fracture System for having certain main seam long is produced by acid fracturing, then crack complexity is improved by water conservancy sand fracturing
Property, finally using further kluftkarren, dissolving fracturing fluid residue is acidified, crack can be improved to greatest extent and led
Stream ability.
The preceding action principle of acid fracturing is：Either sandstone (sandstone acid karst erosion rate is used as premise more than 20%)
Or carbonate rock hydrocarbon reservoir, one of the effect of acid fracturing can be produced with the long Fracture System of certain main seam；Make
With it two be acid fracturing while also a certain amount of rock composition of corrosion, so as to increase the width in crack, be easy to the later stage
Waterpower sand fracturing improve construction sand liquor ratio；The three of effect are entered by the acid solution for rationally designing different viscositys
Row acid fracturing operation, can link up microcrack system, especially in the case that microcrack is also filled by carbonate rock
It is even more so, these microcrack systems, as long as follow-up waterpower sand fracturing construction parameter is reasonable in design, so that it may
Condition is provided for the formation of complex fracture.
For these reasons, the present invention is using first acid fracturing, again waterpower sand fracturing, the order of last matrix acidifying
Especially good effect can be realized.
One of the present invention preferred embodiment in, step 1) in the quantity of selected rock core sample be
Each layer of position more than 3 pieces, preferably greater than 5 pieces, most preferably more than 10 pieces.
The present invention one preferred embodiment in, step 1) described in sour corrosion rate test according to such as
Lower method is carried out：The rock core sample is ground into landwaste, landwaste is dried and weighs；Prepare acid solution；By acid solution
With landwaste hybrid reaction 30-300min, preferably 120min, the remaining landwaste in acid solution is filtered, dries and claims
Weight, according to the ratio of the weight of landwaste before and after reaction, calculates sour corrosion rate.In the present invention, sour corrosion rate is
Refer to the ratio that landwaste dissolves in acid.
One of the present invention preferred embodiment in, step 1) described in acid corrosion fracture it is real
Test and carry out as follows：Polylith rock core sample is put into the test cabinet of fracture guide instrument, and injects acid solution
Acidifying flowing of the simulation acid in crack, then carrys out simulation fracture clossing pressure, and inject to rock core sample pressure
Test fluid, measures the pressure difference parameter of entrance and exit, and the flow conductivity for calculating acid-etched fracture by Darcy formula is joined
Number.
One of the present invention preferred embodiment in, step 1) described in acid corrosion fracture it is real
Test and carry out as follows：From the acid-etched fracture guide instrument of API standard, two pieces of rock core samples are put into survey
Room is tried, and injects acidifying flowing of the acid solution simulation acid in crack, then rock core pressure simulation fracture closure is pressed
Power, and test fluid is injected, the parameters such as the pressure difference of entrance and exit are measured, acid-etched fracture is calculated by Darcy formula
Flow conductivity parameter.
One of the present invention preferred embodiment in, step 1) described in the crack of laying proppant lead
Stream capacity experimental is carried out as follows：Lay proppant in advance in polylith, in the middle of preferably two pieces rock core samples,
The rock core sample for accommodating proppant is put into the test cabinet of fracture guide instrument, and applies certain pressure, injection is surveyed
Test solution, measures pressure difference parameter, and the flow conductivity parameter in the crack for laying proppant is calculated by Darcy formula.
One of the present invention preferred embodiment in, step 1) described in the crack of laying proppant lead
Stream capacity experimental is carried out as follows：From the fracture guide instrument of API standard, in two pieces of rock core samples
Between lay in advance a certain amount of proppant (rock core can with selection standard rock core, can also select pass through acid etch mistake
Rock core), the rock core for accommodating proppant is put into test cabinet, and apply certain pressure, injects test fluid,
The parameters such as pressure difference are measured, the flow conductivity parameter in the crack for laying proppant is calculated by Darcy formula.
The present invention one preferred embodiment in, step 1) described in forecast production pass through ECLIPSE
Software is carried out.It is preferred that, the flow conductivity that experiment is measured together with reservoir rockses parameter, fluid parameter, splits
Parameter etc. is stitched, input ECLIPSE is programmed simulation, the oil and gas production after pre- pressure measurement.
The present invention one preferred embodiment in, step 1) described in sour corrosion rate experiment, acid etching
At least one of the fracture condudtiviy experiment of proppant experiment is tested and laid to fracture condudtiviy indoors
Carry out, the experiment of preferred acid corrosion rate, acid corrosion fracture experiment and the fracture condudtiviy for laying proppant
Experiment is all within indoor progress.
One of the present invention preferred embodiment in, the laboratory experiment of sour corrosion rate is carried out first.In this hair
Bright one preferred embodiment in, rock core is representative, and the rock core quantity of layer position should be more than 10
Block.By the experience of this area, as long as sour corrosion rate can carry out acid fracturing construction operation more than 20%.The present invention is more
Further, parallel laboratory test is carried out to sour corrosion rate and corresponding acid corrosion fracture, and acid-etched fracture is led
The experiment sample of stream carries out different proppants and lays concentration and lay the contrast experiment of mode again, is entered by experimental result
Production forecast after row acid etching.Required if yield is met, selection acid fracturing and two grades of complex methods of pressure break.
Similarly, for acid fracturing and two grades of complex methods of acidifying, the method also tested using laboratory core.First
Rock core is etched again using the sour rock etching test flow conductivity of high viscosity, then with low-viscosity acid solution.For acid
Discharge capacity and liquid measure determination, by field condition carry out similitude processing obtain.
Similarly, for waterpower sand fracturing and two grades of complex methods being acidified and add sand for acid fracturing, waterpower
Pressure break, the three-level complex method of acidifying, are also carried out by above-mentioned same method, will not be repeated here.
The present inventor pass through many experiments after find, as long as by above-mentioned experimental result judge acid fracturing and
Two grades of complex methods of waterpower sand fracturing have feasibility, then acid fracturing, waterpower sand fracturing, matrix acidifying three
Level complex method also has feasibility.Analyzed through the present inventor, reason is：Follow-up acidizing treatment
In addition to further kluftkarren, residue that can also be bad to fracturing liquid rubber-breaking etc. dissolves, reduction filter cake etc.
Content, can further improve the flow conductivity in crack.In addition, low-viscosity acid solution can be carried out to slotted wall rock
Fully etching, increases the porosity of slotted wall rock, particularly with the sandstone reservoir with slotted wall compacted fill ground
Speech, with more important production-increasing function.
Production prediction method after well stimulation, is carried out using conventional ripe business simulation softward ECLIPSE,
This does not go to live in the household of one's in-laws on getting married.
The present invention one preferred embodiment in, in step 2) before also comprise the following steps：
A) reservoir characteristics are evaluated；
B) the reservoir characteristics data obtained based on step a), respectively to acid fracturing, waterpower sand fracturing and matrix acid
Change is optimized.
Based on the analog result of cracking temperature, optimize various kind of liquid, formula and construction parameter, realize most
Good effective reservoir transformation volume and optimal effect of increasing production and volume increase cycle.
One of the present invention preferred embodiment in, reservoir characteristics described in step a) include reservoir
Lithology, water-sensitive characteristic, acid-sensitive characteristic, the quick characteristic of salt, the quick characteristic of alkali, fast quick characteristic, answer force-sensitive property and
One or more in longitudinal profile of geostress, preferably include the lithology of reservoir, water-sensitive characteristic, acid-sensitive characteristic,
The quick characteristic of salt, the quick characteristic of alkali, fast quick characteristic, answer force-sensitive property and longitudinal profile of geostress.
One of the present invention preferred embodiment in, evaluated described in step a) preferably include to reservoir and
Interlayer carries out macroscopical and microcosmic, dynamic and static and nearly well and remote three aspects of well system evaluation up and down.
The present invention one preferred embodiment in, described in step a) evaluate include reservoir lithology and
The parameter such as six quick characteristics (water-sensitive, acid-sensitive, salt are quick, alkali is quick, speed is quick, stress is quick) and longitudinal profile of geostress.
Main method is to utilize geologic assessment data, including well logging and well-log information, rock core information and various drillstem tests
(DST) etc., reservoir is carried out it is macroscopical with it is microcosmic, dynamically complete with three aspects such as static, near well and remote well
The assessment of the reservoir in orientation and up and down interlayer.
The present invention one preferred embodiment in, described in step a) evaluate in it is noted that dynamic and static
The conversion of state parameter, will be converted as log data, mainly with core test data and live small-sized survey
Pressure testing is split data etc. and mutually checked.
One of the present invention preferred embodiment in, the assessment of remote well parameter mainly using pressure break, acidifying,
The data such as the construction parameter and drop of pressure of acid fracturing, to various information such as permeability, crustal stress and the level of reservoir
Stress difference, overall fluid loss coefficient, rock mechanics parameters and intrinsic fracture etc. set up corresponding model, thus carry out
Remote well parameter evaluation.
One of the present invention preferred embodiment in, described in step b)) optimization can be using conventional
Method, carries out the detail design of acid fracturing, water conservancy sand fracturing and matrix acidifying respectively.It is preferred that, wherein water conservancy
Sand fracturing design will fully coordinate the result of early stage acid fracturing.
It is the design of acid fracturing first.One of the present invention preferred embodiment in, simulated with ripe business
Software such as STIMPLAN, and step a) evaluation result (primarily longitudinal profile of geostress etc.), simulation
Different displacements, viscosity and Fracture geometric size and flow conductivity under acid solution scale.It particularly to be noted that,
On the basis of simulating herein, fixed total liquid measure under conditions of only change discharge capacity and viscosity, observes above-mentioned split
The situation of change of parameter is stitched, the combination for becoming discharge capacity and becoming viscosity can be typically taken.For simplicity, discharge capacity is variable
Change 3 grades, 2 grades of viscosity alterable.The purpose for becoming discharge capacity is that control seam is high, and the purpose for becoming viscosity is using viscous
Fingering effect, and low-viscosity the advantage that leak-off is big and etching effect is good, produce as far as possible complexity Fracture System.
Next to that the design of waterpower sand fracturing.The present invention one preferred embodiment in, before coordinating
The result of phase acid fracturing, initial stage uses low-viscosity fracturing fluid, it is therefore an objective to the characteristics of being easily accessible narrow slit using it, to the greatest extent
Into the small yardstick Fracture System that is formed during acid fracturing and extension may be allowed to continue to more, with highly raising as far as possible
The complexity degree in crack；The need for coordinating low-viscosity fracturing fluid to enter small yardstick crack, small displacement should be used
Injection, huge discharge will cause fracturing fluid to enter the reduction of the ratio in small yardstick crack in various degree；With construction
Carry out, discharge capacity and viscosity can gradually increase, particle diameter of construction sand liquor ratio and proppant etc. also can gradually increase.Always
Construction Mode be：(thinlyfluid expands acid etching microcrack system) (the low discharge capacity small particle of low-viscosity is low
Sand liquor ratio) (in middle viscosity in discharge capacity in particle diameter sand liquor ratio) (big particle diameter STOL of the high discharge capacity of high viscosity
Liquor ratio).As for each section of macro ratio distribution, results of fracture simulation result Proper Match is based primarily upon.For simplicity
For the sake of, tentatively it can be carried out by 1/61/31/31/6.
It is finally the design of matrix acidifying.The present invention one preferred embodiment in, first calculate shaft bottom split
Stitch clossing pressure, then it is counter push away well head fracture closure pressure (in the case of termination of pumping using shaft bottom clossing pressure with it is vertical
The difference of the liquid column hydrostatic pressure of pit shaft), closed after the pressure after hydraulic fracturing termination of pumping less than the well head of above-mentioned calculating
After resultant pressure, you can carry out matrix acidifying construction；The selection of discharge capacity should be protected using well head clossing pressure as critical value
Crack is no longer opened during card injection low-viscosity acid solution, to prevent the sedimentation again of proppant, so as to influence remote
The supporting efficiency and flow conductivity in well crack；The selection of closed acidization acid solution viscosity, should be compared with fracturing fluid viscosity
It is at least low more than 6 times, to ensure that viscous fingering effect and acid solution can quickly push fracture tip to；The selection of liquid measure
More than 2 times of the crevice volume of early stage acid fracturing pressure break should be remained, to ensure there are enough acid solutions to dissolve pressure break
Liquid does not break the residue of glue, and acid solution is to the corrosion effect of slotted wall.
One of the present invention preferred embodiment in, in step 2) after also pressed after evaluation, and root
According to evaluation result after pressure to step 1) and/or step 2) further optimized.Evaluated behind this area, pressure
It is a general concept, including Crack Monitoring in work progress, pressure temperature measuring, software simulation etc. one
Series, system work.Its method is varied, core purpose be according to construction parameter (pressure and other parameters),
With the actual fracture pattern of Software on Drawing, and contrasted with the design before pressure, on the one hand can be after pre- pressure measurement
Yield, the problem of on the other hand can analyzing the presence in work progress and deficiency, for optimizing construction from now on
Design.It for details, reference can be made to《Reservoir stimulation》, [U.S.] meter Ka Er J. Ai Kenuo Meads this work, oil work
Industry publishing house, 2002.
One of the present invention preferred embodiment in, in step 2) after also pressed after evaluation, and root
According to evaluation result after pressure to step 1), step 2), one or more of step a) and step b) step
Further optimized.
One of the present invention preferred embodiment in, method of the invention also includes the row of returning design after measure.
The present invention one preferred embodiment in, using indoor acid-rock reaction data as foundation, wait closure acid solution become
For the closed-in time that the residual sour time is the row of returning after pressure.The row of returning immediately is crossed after this time.Discharge speed is still from well
The anti-clossing pressure for shifting well head onto of the clossing pressure at bottom, can be appropriate when well head pressure is higher than well head clossing pressure
Small oil nozzle controls open flow, and after well head pressure is less than well head clossing pressure, can moderately beam up carry out open flow.
After well head pressure is reduced to 0, it is contemplated that the artificial lift measure such as suction.
One of the present invention preferred embodiment in, carry out asking production by normal flow, and with the routine of offset well
Technology is analyzed.The assessment result after pressing, repeat step 1) -2) (preferably also including step a)-b)
And/or evaluation procedure after pressure), this three-level increasing production by compounding technology of sustained improvement, with the constantly improve technology (for example
Reach gratifying yield).The present invention one preferred embodiment in, improve after write formulation skill
Art specification and standard.
In the present invention, unless otherwise indicated, term " acidifying " is the abbreviation of term " matrix acidifying ".
The beneficial effects of the present invention are：The three-level method for increasing production by compounding of the present invention, substantially increases effective fracture
Volume is transformed, optimal effect of increasing production and volume increase cycle is realized, the target of " cost efficiency " is better achieved.
Embodiment
With reference to non-limiting specific embodiment, the invention will be further described, but the protection model of the present invention
Enclose and be not limited to following embodiments.
Embodiment 1
By taking the carbonate reservoir in certain Chinese oil field as an example, the present invention is described in more detail, oil field A wells
Need to carry out pressure break completion：
Step 1, fine evaluation is carried out to the reservoir key parameter of A well target zones.By well logging, well-log information,
Rock core information and various drillstem test data etc., assess reservoir lithology, six quick characteristics, longitudinal profile of geostress
Etc. parameter, the design for arrangement and method for construction；
Step 2, the rock core sample of A well target zones is chosen, sour corrosion rate experiment is carried out, it is abundant through 1 hour
After acid etching reaction, it is 75% to measure corrosion rate, and acid corrosion fracture experiment is carried out using the rock core plate of processing,
Flow conductivity is measured under strata pressure for 28Dcm, capability forecasting is carried out using ECLIPSE, as a result up to not
To expected volume, and then the sample tested to acid-etched fracture guide carries out laying again the fracture condudtiviy of proppant
Experiment, measures flow conductivity for 51Dcm under strata pressure, and prediction production capacity meets expected volume,
Because the sour corrosion rate measured is more than 20%, and the yield predicted reaches predetermined value, therefore selection is carried out
Acid fracturing, waterpower sand fracturing and matrix acidifying three-level method for increasing production by compounding；
Step 3, on the basis of step 2 experimental result, it is determined that to A wells according to first acid fracturing, waterpower adds sand again
Pressure break, the order of last matrix acidifying carries out the three-level volume increase of acid fracturing, waterpower sand fracturing and matrix acidifying respectively
Measure, wherein, acid fracturing is used to make major fracture, and increases fracture width by corrosion, links up microcrack system
System；Waterpower sand fracturing is used to support the crack pressed off, keeps the unlatching in crack after pressure, improves fracture guide energy
Power；Matrix acidifying is carried out in final step, is played kluftkarren, dissolving fracturing fluid residue, reduction filter cake etc. and is made
With further the flow conductivity in raising crack, improves effect of increasing production；
Step 4, detail design is carried out according to the order of acid fracturing, waterpower sand fracturing and matrix acidifying.In acid fracturing
In design, detail design is carried out using STIMPLAN and the evaluating of step 1, it is determined that construction row
Amount, the sour construction parameter such as viscosity and liquid measure；On the basis of acidizing simulation result, waterpower sand fracturing is carried out
Detail design, the present embodiment simulated using FracproPT softwares, it is determined that discharge capacity, sand feeding amount, sand
The construction parameters such as concentration；Finally using well head clossing pressure as critical value, the discharge capacity of matrix acidifying is determined, with pressure break
The 1/6 of fluid viscosity determines acid liquid viscosity, and acid solution consumption is the crack body that STIMPLAN and FracproPT is simulated
Long-pending 50%~80%.
Step 5, according to the detail design of step 4, the live pressing crack construction of A wells has been smoothly completed, scene is altogether
Inject gel acid 300m3For acid fracturing, low viscous fracturing fluid 130m3, high viscosity fracturing fluid 200m3, add support
Agent 35m3, it is acidified with inorganic HCL hydrochloric acid 27m3；
Step 6, so that in step 2, sour rock sufficient reaction time is defined, closing well is returned after 1 hour after pressure
Row, after normal production, day 117.5 tons of oil-producing, relatively with block, other wells improve more than 50%, volume increase effect to yield
Fruit is substantially.
Step 7, according to construction and manufacturing parameter, analysis and assessment after pressing A wells, as a result show actual
Seam effect ideal is made, it is higher that proppant lays efficiency, it is contemplated that stable production period is longer.
Embodiment 2
By taking the carbonate reservoir in certain Chinese oil field as an example, the present invention is described in more detail, oil field B wells
Need to carry out pressure break completion：
Step 1, fine evaluation is carried out to the reservoir key parameter of B well target zones.By well logging, well-log information,
Rock core information and various drillstem test data etc., assess reservoir lithology, six quick characteristics, longitudinal profile of geostress
Etc. parameter, the design for arrangement and method for construction；
Step 2, the rock core sample of B well target zones is chosen, sour corrosion rate experiment is carried out, it is abundant through 1 hour
After acid etching reaction, it is 89% to measure corrosion rate, and acid corrosion fracture experiment is carried out using the rock core plate of processing,
It is 31Dcm to measure flow conductivity under strata pressure, carries out capability forecasting using ECLIPSE, does not as a result reach
Expected volume, and then the sample tested to acid-etched fracture guide carries out laying again the fracture condudtiviy reality of proppant
Test, flow conductivity measured under strata pressure for 60Dcm, prediction production capacity meets expected volume,
Because the sour corrosion rate measured is more than 20%, and the yield predicted reaches predetermined value, therefore selection is carried out
Acid fracturing, waterpower sand fracturing and matrix acidifying three-level method for increasing production by compounding；
Step 3, on the basis of step 2 experimental result, it is determined that to B wells according to first acid fracturing, waterpower adds sand again
Pressure break, the order of last matrix acidifying carries out the three-level volume increase of acid fracturing, waterpower sand fracturing and matrix acidifying respectively
Measure, wherein, acid fracturing is used to make major fracture, and increases fracture width by corrosion, links up microcrack system
System；Waterpower sand fracturing is used to support the crack pressed off, keeps the unlatching in crack after pressure, improves fracture guide energy
Power；Matrix acidifying is carried out in final step, is played kluftkarren, dissolving fracturing fluid residue, reduction filter cake etc. and is made
With further the flow conductivity in raising crack, improves effect of increasing production；
Step 4, detail design is carried out according to the order of acid fracturing, waterpower sand fracturing and matrix acidifying.In acid fracturing
In design, detail design is carried out using STIMPLAN and the evaluating of step 1, it is determined that construction row
Amount, the sour construction parameter such as viscosity and liquid measure；On the basis of acidizing simulation result, waterpower sand fracturing is carried out
Detail design, the present embodiment simulated using FracproPT softwares, it is determined that discharge capacity, sand feeding amount, sand
The construction parameters such as concentration；Finally using well head clossing pressure as critical value, the discharge capacity of matrix acidifying is determined, with pressure break
The 1/6 of fluid viscosity determines acid liquid viscosity, and acid solution consumption is the crack body that STIMPLAN and FracproPT is simulated
Long-pending 50%~80%.
Step 5, according to the detail design of step 4, the live pressing crack construction of B wells has been smoothly completed, scene is altogether
Inject gel acid 400m3For acid fracturing, low viscous fracturing fluid 150m3, high viscosity fracturing fluid 280m3, add support
Agent 40m3, it is acidified with inorganic HCL hydrochloric acid 30m3；
Step 6, so that in step 2, sour rock sufficient reaction time is defined, closing well is returned after 1 hour after pressure
Row, after normal production, day 139.7 tons of oil-producing, relatively with block, other wells improve more than 60%, volume increase effect to yield
Fruit is substantially.
Step 7, according to construction and manufacturing parameter, analysis and assessment after pressing B wells, as a result show actual
Seam effect ideal is made, it is higher that proppant lays efficiency, it is contemplated that stable production period is longer.
Comparative example 1
Other steps are same as Example 2, the difference is that only, step 2) in three-level method for increasing production by compounding
In three steps order it is different, i.e., according to first matrix acidifying, again acid fracturing, last waterpower sand fracturing it is suitable
Sequence carries out volume increase construction respectively.89.1 tons of oil-producing of day after the well pressure, compared with offset well, effect of increasing production improves 20%,
Effect is far below the effect of increasing production of raising more than 60% in embodiment.
Comparative example 2
With the same block of embodiment 1, the old well M of same payzone has carried out single acid fracturing construction (acid for 2011
Pressure condition used or parameter and the condition or parameter of acid fracturing in embodiment 1 are same or equivalent), day oil-producing after pressure
56.2 tons, effect of increasing production is far below the three-level increasing production by compounding implementation result of embodiment 1.
Comparative example 3
With the same block of embodiment 2, the old well N of same payzone has carried out acid fracturing and waterpower plus sand pressure for 2013
The construction of two grades of increasing production by compounding (condition or parameter used in acid fracturing and waterpower sand fracturing and the acid in embodiment 2 split
Pressure and the condition or parameter of waterpower sand fracturing are same or equivalent), 87.3 tons of oil-producing of day after pressure, effect of increasing production is remote
Less than the three-level increasing production by compounding implementation result of embodiment 2.
It should be noted that embodiment described above is only used for explaining the present invention, do not constitute to the present invention's
Any limitation.By referring to exemplary embodiments, invention has been described, it should be appreciated that wherein used
Word is descriptive and explanatory vocabulary, rather than limited vocabulary.Can be by regulation in the claims in the present invention
In the range of the present invention is modified, and in without departing substantially from scope and spirit of the present invention to the present invention progress
Revision.Although the present invention described in it is related to specific method, material and embodiment, it is not intended that
The present invention is limited to wherein disclosed particular case, on the contrary, to can be extended to other all with identical function by the present invention
Methods and applications.
Claims (10)
1. a kind of three-level composite petroleum method for increasing, comprises the following steps：
1) rock core sample is chosen to carry out sour corrosion rate experiment, acid corrosion fracture experiment and lay proppant
Fracture condudtiviy experiment, by sour corrosion rate experiment measure sour corrosion rate, pass through acid corrosion fracture
Experiment and the fracture condudtiviy experiment of laying proppant measure flow conductivity parameter respectively, and based on leading for measuring
Stream ability parameter carrys out forecast production,
If sour corrosion rate is more than 20%, and the yield predicted reaches predetermined value, then selection carries out acid fracturing, waterpower
Sand fracturing and matrix acidifying three-level method for increasing production by compounding；
2) according to first acid fracturing, again waterpower sand fracturing, the order of last matrix acidifying carries out acid fracturing, water respectively
Power sand fracturing and matrix acidifying oil output.
2. selected rock core sample according to the method described in claim 1, it is characterised in that step 1)
Quantity be each layer of position more than 3 pieces, preferably greater than 5 pieces, most preferably more than 10 pieces.
3. method according to claim 1 or 2, it is characterised in that step 1) described in acid etching split
Seam flow conductivity experiment is carried out as follows：By polylith, preferably two pieces rock core samples be put into fracture guide instrument
Test cabinet, and inject acid solution come simulate acid in crack acidifying flowing, mould then is come to rock core sample pressure
Intend fracture closure pressure, and inject test fluid, measure the pressure difference parameter of entrance and exit, pass through Darcy formula meter
Calculate the flow conductivity parameter of acid-etched fracture.
4. the method according to any one of claim 1-3, it is characterised in that step 1) described in
The fracture condudtiviy experiment for laying proppant is carried out as follows：In polylith, preferably two pieces rock core samples
It is middle to lay proppant in advance, the rock core sample for accommodating proppant is put into the test cabinet of fracture guide instrument, and apply
Plus certain pressure, test fluid is injected, pressure difference parameter is measured, is calculated by Darcy formula and lays splitting for proppant
The flow conductivity parameter of seam.
5. the method according to any one of claim 1-4, it is characterised in that step 1) described in
Forecast production is carried out by ECLIPSE softwares.
6. the method according to any one of claim 1-5, it is characterised in that in step 2) go back before
Comprise the following steps：
A) reservoir characteristics are evaluated；
B) the reservoir characteristics data obtained based on step a), respectively to acid fracturing, waterpower sand fracturing and matrix acid
Change is optimized.
7. method according to claim 6, it is characterised in that the reservoir characteristics bag described in step a)
Include the lithology of reservoir, water-sensitive characteristic, acid-sensitive characteristic, the quick characteristic of salt, the quick characteristic of alkali, fast quick characteristic, stress quick
One or more in characteristic and longitudinal profile of geostress, preferably include the lithology, water-sensitive characteristic, acid of reservoir
The quick characteristic of quick characteristic, salt, the quick characteristic of alkali, fast quick characteristic, answer force-sensitive property and longitudinal profile of geostress.
8. the method according to claim 6 or 7, it is characterised in that being evaluated described in step a) includes
Interlayer carries out that macroscopical with static state and closely well is with remote three aspects of well with microcosmic, dynamic to reservoir and up and down
System is evaluated.
9. the method according to any one of claim 1-5, it is characterised in that in step 2) go back afterwards
Evaluated after being pressed, and according to evaluation result after pressure to step 1) and/or step 2) further optimized.
10. the method according to any one of claim 6-8, it is characterised in that in step 2) after
Evaluated after also being pressed, and according to evaluation result after pressure to step 1), step 2), step a) and step b)
One or more of step further optimized.
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