CN108661619B - A kind of method of determining carbonate rock hydrocarbon reservoir acid etching sand packed fracture sanding concentration - Google Patents
A kind of method of determining carbonate rock hydrocarbon reservoir acid etching sand packed fracture sanding concentration Download PDFInfo
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- 239000002253 acid Substances 0.000 title claims abstract description 130
- 239000004576 sand Substances 0.000 title claims abstract description 95
- 238000005530 etching Methods 0.000 title claims abstract description 77
- 239000011435 rock Substances 0.000 title claims abstract description 50
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 12
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 12
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 18
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- 238000004519 manufacturing process Methods 0.000 claims description 8
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- 239000012530 fluid Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- KKADPXVIOXHVKN-UHFFFAOYSA-N 4-hydroxyphenylpyruvic acid Chemical compound OC(=O)C(=O)CC1=CC=C(O)C=C1 KKADPXVIOXHVKN-UHFFFAOYSA-N 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention discloses a kind of methods of determining carbonate rock hydrocarbon reservoir acid etching sand packed fracture sanding concentration, comprising: (1) chooses the rock beam after work area destination layer acid etch, test acid-etched fracture self-supporting flow conductivityF c0With the acid etching sand packed fracture flow conductivity under different sanding concentrationF cs, determine the lower limit of acid etching sand packed fracture sanding concentrationC pl；(2) it is based on reservoir rock mechanical characteristics parameter, acid fracturing construction parameter, acid solution rheological parameter and proppant performance parameter, calculates the upper limit for determining acid etching sand packed fracture sanding concentrationC pu；(3) the acid etching sand packed fracture sanding concentration range determined based on step (1) and step (2) determines acid etching sand packed fracture sanding concentration using the flow conductivity of reservoir productivity demand as targetC p.Operation of the present invention is easy, and principle is reliable, can quantitatively determine the acid etching sand packed fracture sanding concentration added in sand ACID FRACTURING TECHNOLOGY, is conducive to raising carbonate rock hydrocarbon reservoir and adds the accuracy of sand ACID FRACTURING TECHNOLOGY conceptual design and add the success rate of sand acid fracturing construction.
Description
Technical field
The present invention relates to petroleum works field, especially carbonate rock hydrocarbon reservoirs to add a kind of determination in sand acid fracturing stimulation process
The method of carbonate rock hydrocarbon reservoir acid etching sand packed fracture sanding concentration.
Background technique
ACID FRACTURING TECHNOLOGY is one of the key technology of carbonate rock hydrocarbon reservoir storey increase design, acid solution non-homogeneous quarter when acid fracturing is constructed
Crack wall surface is lost, after construction, under clossing pressure effect, undissolved region has certain geometry as supporting point, formation
The acid-etched fracture of size and flow conductivity, to realize well production increment.Acid corrosion fracture is to influence acid fracturing effect
One of key factor (MJ Economides, AD Hill, C Ehlig-Economides, Ding Zhu.Petroleum
production systems[M].New York:Pearson Education International,p553-554).So
And, reservoir rock mechanical strength lower reservoir higher for clossing pressure, even if foring non-homogeneous etching after acid etch,
It leaves many non-corrosion parts and forms supporting point, but since clossing pressure is higher, supporting point rock mechanics intensity is low, be closed
Effective flow conductivity (the Mechanism Study that He Chunming, Guo Jianchun acid solution influence limestone mechanical property is hardly formed under pressure
[J] Chinese Journal of Rock Mechanics and Engineering, 2013 (s2): 003016-3021)；Carbonate rock for lithology compared with homogeneous, acid solution are equal
Even etching fracture wall surface rock, the supporting point formed after etching is less, is more difficult to be formed at this time under clossing pressure to have and centainly lead
The acid-etched fracture of stream ability, both situations have seriously affected acid fracturing effect.Adding sand ACID FRACTURING TECHNOLOGY is by acid fracturing and hydraulic fracturing
Advantage combines, and can be effectively improved the flow conductivity of acid-etched fracture, it carries branch by high glutinous cross-linked acid or fracturing fluid gel
Support agent enters stratum, forms acid etching sand packed fracture, after construction, proppant pressure-bearing formed effectively support (Luo Yun, Liu Aihua,
Wang Junming, application [J] the petroleum journal for waiting cross-linked acid to add sand acid-fracture technology in complex reservoir, 2008,29 (2):
266-269；The compound seam net ACID FRACTURING TECHNOLOGY research of Chu Ming remittance dense carbonate reservoir and mining site practice --- with DaNiuDi gas field
[J] oil drilling technology, 2017,39 (2): 237-243 for five _ 5 carbonate reservoir of Lower Paleozoic strata horse).
Sanding concentration is one of the important parameter for influencing acid etching sand packed fracture flow conductivity, however, outstanding under formation conditions
It is deep-well reservoir, and acid fracturing crack changes of slit length is complicated, when sanding excessive concentration, easily causes sand plug；When sanding concentration is lower,
The effect for improving acid corrosion fracture is not achieved again, it is thus determined that the sanding concentration of reasonable acid etching sand packed fracture has weight
Want meaning.
Summary of the invention
The purpose of the present invention is to provide a kind of method of determining carbonate rock hydrocarbon reservoir acid etching sand packed fracture sanding concentration,
This method is easy to operate, principle is reliable, can efficiently and accurately be determined according to specific reservoir conditions plus sand ACID FRACTURING TECHNOLOGY is suitably spread
Sand concentration.
In order to reach the above technical purpose, the present invention provides following technical scheme.
Present invention selected part acid etch rock beam first tests acid etching self-supporting crack, acid etching sand packed fracture water conservancy diversion respectively
Ability determines sanding concentration limit；Then, it is based on reservoir geology and construction parameter, calculates and determines acid etching sand packed fracture sanding
Upper limit of concentration；Finally, in conjunction with sanding concentration range, determining the sanding of production capacity demand according to the target flow conductivity of production capacity demand
Concentration.
A kind of method of determining carbonate rock hydrocarbon reservoir acid etching sand packed fracture sanding concentration, successively includes the following steps:
(1) rock beam (rock sample) after work area destination layer acid etch is chosen, acid-etched fracture self-supporting flow conductivity F is testedc0With
Acid etching sand packed fracture flow conductivity F under different sanding concentrationcs, determine the lower limit C of acid etching sand packed fracture sanding concentrationpl；
(2) reservoir rock mechanical characteristics parameter, acid fracturing construction parameter, acid solution rheological parameter and proppant performance ginseng are based on
Number calculates the upper limit C for determining acid etching sand packed fracture sanding concentrationpu；
(3) the acid etching sand packed fracture sanding concentration range determined based on step (1) and step (2), with reservoir productivity demand
Flow conductivity be target, determine acid etching sand packed fracture sanding concentration Cp。
In the present invention, the rock beam (rock sample) after work area destination layer acid etch is chosen in the step (1), test acid etching is split
Stitch self-supporting flow conductivity Fc0With the acid etching sand packed fracture flow conductivity F under different sanding concentrationcs, determine acid etching sand packed fracture
The lower limit C of sanding concentrationpl, including the following steps:
1) 6 pairs of rock beams (or rock sample) after choosing the experiment of work area destination layer acid etch, optionally wherein 1 pair of rock beam tests acid etching
It splits
Stitch self-supporting flow conductivity Fc0；
2) by the remaining 5 pairs of acid etch rock beams of step 1), respectively according to 1kg/m2、2kg/m2、4kg/m2、6kg/m2、8kg/
m2
Sanding concentration, proppant is fully populated in the acid-etched fracture between two rock beams in API diversion chamber, test storing up
Layer closes
The flow conductivity F of acid etching sand packed fracture under resultant pressurecs.Work as Fcs≥1.2Fc0When, wherein meeting the minimum of relational expression
FcsValue pair
The sanding concentration answered is the lower limit C of acid etching sand packed fracture sanding concentrationpl。
In the present invention, reservoir rock mechanical characteristics parameter, acid fracturing construction parameter, acid solution stream are based in the step (2)
Variable element and proppant performance parameter calculate the upper limit C for determining acid etching sand packed fracture sanding concentrationpu.Sanding upper limit of concentration CpuIt presses
It is calculated according to following formula:
In formula: CpuFor acid etching sand packed fracture sanding upper limit of concentration, kg/m2, φpFor the hole of proppant stages in sand packed fracture
Degree, %；ρpFor proppant density, kg/m3；N is fluid flow pattern index, zero dimension；K ' is acid solution consistency coefficient under formation condition,
Pa·sn；Q is operational discharge capacity, m3/s；xfLong, the m for acid etching sand packed fracture half；hfHigh, m is stitched for acid etching sand packed fracture；ν is crack
Face Rock Poisson Ratio Using, zero dimension；E is fracture surface rock Young's modulus, Pa.
The derivation process of formula (1) is as follows:
Assuming that a length of x of acid etching sand packed fracture halff, acid etching sand packed fracture height is hf, then proppant mass M in sand packed fracturep
Are as follows:
Mp=2xfhfwp(1-φp)ρp (2)
In sand packed fracture, sanding concentration CpIs defined as:
Formula (2) and formula (3) are combined, can must be averaged acid etching sand packed fracture slit width are as follows:
The acid solution consistency coefficient transformational relation of formation condition and experiment test are as follows:
To sum up, the average dynamic slit width during acid fracturingAre as follows:
Obviously, average acid etching sand packed fracture slit width need to meet less than hydraulic fracture average dynamic slit width (Wang Hongxun, scholar
Sincere hydraulic fracturing design value calculation method [M] petroleum industry publishing house, 1998), it may be assumed that
(4)-(7) formula simultaneous can obtain,
Consider that Deep Carbonate Rocks add sand engineering difficulty, sanding concentration is multiplied by safety coefficient 0.7, then formula (8) becomes:
When formula (9) takes equal sign, the upper limit C of sanding concentration can be obtainedpu, i.e. formula (1).
In formula: K0For the acid solution consistency coefficient of experiment test, Pasn；wpFor acid etching sand packed fracture slit width, m；CpFor sanding
Concentration, kg/m2；MpFor proppant quality, Kg.
In the present invention, dense based on the determining acid etching sand packed fracture sanding of step (1) and step (2) in the step (3)
It spends range and determines acid etching sand packed fracture sanding concentration C using the flow conductivity of reservoir productivity demand as targetp, including following step
It is rapid:
1) with the fracture condudtiviy F of reservoir productivity demandcnFor target, the sanding concentration for meeting reservoir productivity demand is determined
Cpn, with step (1) test 5 groups of acid etching sand packed fracture flow conductivity FcsComparison:
1. if FcnLess than all FcsValue does not use then and adds sand ACID FRACTURING TECHNOLOGY, i.e. Cpn=0；
2. if FcnIn FcsWithin the scope of, it chooses closest to FcnFcsIt is worth the flow conductivity as reservoir productivity demand, and right
The sanding concentration answered is Cpn；
3. if FcnGreater than all FcsValue then increases sanding concentration one by one, tests flow conductivity, to more than be equal to FcnUntil,
And corresponding sanding concentration is Cpn。
2) by the sanding concentration C of the production capacity demand 1) determinedpn, split in conjunction with the acid etching back-up sand that step (1) and step (2) determine
Sanding concentration range is stitched, determines acid etching sand packed fracture sanding concentration C when Oil Field implements to add sand ACID FRACTURING TECHNOLOGYp:
1. if Cpn>Cpu, then Cp=Cpu；
2. if Cpl≤Cpn≤Cpu, then Cp=Cpn；
3. if Cpn<CplOr Cpn=0, then Cp=Cpn=0, i.e., do not consider to add sand ACID FRACTURING TECHNOLOGY.
The beneficial effects of the present invention are: from carbonate rock acid etching sand packed fracture flow conductivity and the engineering for adding sand ACID FRACTURING TECHNOLOGY
From the aspect of risk two, the acid etching sand packed fracture sanding concentration added in the design of sand ACID FRACTURING TECHNOLOGY is quantitatively determined, has been conducive to improve
Carbonate rock hydrocarbon reservoir adds the accuracy of sand ACID FRACTURING TECHNOLOGY conceptual design and adds the success rate of sand acid fracturing construction.
Detailed description of the invention
Fig. 1 is acid etching self-supporting crack and acid etching sand packed fracture flow conductivity curve graph.
Specific embodiment
The present invention is further illustrated with application example with reference to the accompanying drawing, it is intended to the present invention is schematically illustrated, and
It does not limit the scope of the invention.
Application example
A kind of method of determining carbonate rock hydrocarbon reservoir acid etching sand packed fracture sanding concentration, detailed process is as follows:
(1) rock beam (rock sample) after work area destination layer acid etch is chosen, acid-etched fracture self-supporting flow conductivity F is testedc0With
Acid etching sand packed fracture flow conductivity F under different sanding concentrationcs, determine the lower limit C of acid etching sand packed fracture sanding concentrationpl。
Select Sichuan Basin Reservoir Section 6 to API standard acid etch rock beam, rock beam long 175.0 ± 0.2mm, width 35.0mm
± 0.2mm, thickness 50.0mm ± 0.2mm.Randomly select 1 couple of test self-supporting acid-etched fracture Fc0, remaining 5 pairs of rock beams test acid etching fills out
Sand fracture condudtiviy Fcs, test result is depicted as curve graph (see Fig. 1), and specific experiment scheme is shown in Table 1.
1 acid etching self-supporting crack of table and acid etching sand packed fracture flow conductivity test experiments scheme
Based on flow conductivity test result, at the formation closure pressure 48.3MPa of work area, self-supporting fracture condudtiviy Fc0
For 5.5Dcm.As shown in Figure 1, the acid etching sand packed fracture flow conductivity (F that meets the requirementscs≥1.2Fc0) minimum value counter sample
For No. 2 rock beams, therefore, the lower limit C of acid etching sand packed fracture sanding concentrationplIt should be 2kg/m2。
(2) reservoir rock mechanical characteristics parameter, acid fracturing construction parameter, acid solution rheological parameter and proppant performance ginseng are based on
Number calculates and determines acid etching sand packed fracture sanding upper limit of concentration Cpu。
Based on the reservoir engineering in table 2, geologic parameter, sanding upper limit of concentration C is calculated by formula (1)puFor 9.0kg/m2。
2 Sichuan Basin reservoir engineering of table, geologic parameter
| Young's modulus, Pa | 6.4×1010 | Operational discharge capacity, m3/min | 6.0 |
| Poisson's ratio, zero dimension | 0.2 | Consistency coefficient, Pasn | 1.548 |
| Acid etching sand packed fracture seam is high, m | 30 | Flow stance index, zero dimension | 0.215 |
| Acid etching sand packed fracture seam length, m | 60 | Production capacity demand flow conductivity, Dcm | 15 |
(3) the acid etching sand packed fracture sanding concentration range determined based on step (1) and step (2), with reservoir productivity demand
Flow conductivity be target, determine acid etching sand packed fracture sanding concentration Cp。
As shown in Figure 1, the rock beam closest to production capacity demand flow conductivity is No. 3 rock beams, sanding concentration CpnFor 4kg/m2。
Meet Cpl≤Cpn≤CpuCondition, it is thus determined that sanding concentration when reservoir construction plus the construction of sand acid fracturing is Cp=Cpn=4kg/
m2。
Claims (1)
1. a kind of method of determining carbonate rock hydrocarbon reservoir acid etching sand packed fracture sanding concentration, successively includes the following steps:
(1) rock beam after work area destination layer acid etch is chosen, acid-etched fracture self-supporting flow conductivity F is testedc0It is dense with different sandings
Acid etching sand packed fracture flow conductivity F under degreecs, determine the lower limit C of acid etching sand packed fracture sanding concentrationpl, process is as follows:
1) 6 pairs of rock beams after choosing the experiment of work area destination layer acid etch, optionally wherein 1 pair of rock beam test acid-etched fracture self-supporting is led
Stream ability Fc0；
2) by the remaining 5 pairs of acid etch rock beams of step 1), respectively according to 1kg/m2、2kg/m2、4kg/m2、6kg/m2、8kg/m2's
Proppant is fully populated in the acid-etched fracture between two rock beams in API diversion chamber by sanding concentration, is tested in reservoir clossing pressure
The flow conductivity F of lower acid etching sand packed fracturecs, work as Fcs≥1.2Fc0When, wherein meeting the minimum F of relational expressioncsIt is worth corresponding sanding
Concentration is the lower limit C of acid etching sand packed fracture sanding concentrationpl；
(2) it is based on reservoir rock mechanical characteristics parameter, acid fracturing construction parameter, acid solution rheological parameter and proppant performance parameter, is pressed
The upper limit C for determining acid etching sand packed fracture sanding concentration is calculated according to following formulapu:
In formula: CpuFor acid etching sand packed fracture sanding upper limit of concentration, kg/m2, φpFor the hole of proppant stages in sand packed fracture
Degree, %；ρpFor proppant density, kg/m3；N is fluid flow pattern index, zero dimension；K ' is acid solution consistency coefficient under formation condition,
Pa·sn；Q is operational discharge capacity, m3/s；xfLong, the m for acid etching sand packed fracture half；hfHigh, m is stitched for acid etching sand packed fracture；ν is crack
Face Rock Poisson Ratio Using, zero dimension；E is fracture surface rock Young's modulus, Pa；
(3) the acid etching sand packed fracture sanding concentration range determined based on step (1) and step (2), with leading for reservoir productivity demand
Stream ability is target, determines acid etching sand packed fracture sanding concentration Cp, process is as follows:
1) with the fracture condudtiviy F of reservoir productivity demandcnFor target, the sanding concentration C for meeting reservoir productivity demand is determinedpn,
With 5 groups of acid etching sand packed fracture flow conductivity F of step (1) testcsComparison:
1. if FcnLess than all FcsValue does not use then and adds sand ACID FRACTURING TECHNOLOGY, i.e. Cpn=0；
2. if FcnIn FcsWithin the scope of, it chooses closest to FcnFcsIt is worth the flow conductivity as reservoir productivity demand, and corresponding
Sanding concentration is Cpn；
3. if FcnGreater than all FcsValue then increases sanding concentration one by one, tests flow conductivity, to more than be equal to FcnUntil, and it is right
The sanding concentration answered is Cpn；
2) by the sanding concentration C of the production capacity demand 1) determinedpn, spread in conjunction with the acid etching sand packed fracture that step (1) and step (2) determine
Sand concentration range determines acid etching sand packed fracture sanding concentration C when Oil Field implements to add sand ACID FRACTURING TECHNOLOGYp:
1. if Cpn>Cpu, then Cp=Cpu；
2. if Cpl≤Cpn≤Cpu, then Cp=Cpn；
3. if Cpn<CplOr Cpn=0, then Cp=Cpn=0, i.e., do not consider to add sand ACID FRACTURING TECHNOLOGY.
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| CN109653740B (en) * | 2018-12-26 | 2020-11-10 | 西南石油大学 | Carbonate rock acid fracturing self-supporting fracture permeability prediction method |
| CN112302613B (en) * | 2019-07-26 | 2023-03-24 | 中国石油化工股份有限公司 | Deep carbonate rock self-supporting acid fracturing method for improving acid-etched fracture channel depth |
| CN111219175B (en) * | 2020-01-08 | 2020-10-09 | 西南石油大学 | Fractured carbonate rock acid fracturing fracture matching optimization method considering stress sensitivity |
| CN114441423A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Method for predicting flow conductivity of carbonate rock self-supporting acid-etched fracture |
| CN112761607B (en) * | 2021-02-05 | 2021-11-30 | 西南石油大学 | Interactive sand-filled fracture conductivity calculation method for intersection of hydraulic fracture and natural fracture |
| CN114278266B (en) * | 2021-12-29 | 2022-11-22 | 西南石油大学 | Method for determining effective joint length of acid-etched sand-filled crack under in-situ condition |
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| CN104989364B (en) * | 2015-06-11 | 2017-05-03 | 西南石油大学 | Method for evaluating etching forms of surface of rock plate in acid etching physical simulation test |
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