CN110259426A - Pressure alters the evaluation method of degree between a kind of unconventional platform well well - Google Patents
Pressure alters the evaluation method of degree between a kind of unconventional platform well well Download PDFInfo
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- CN110259426A CN110259426A CN201910588362.XA CN201910588362A CN110259426A CN 110259426 A CN110259426 A CN 110259426A CN 201910588362 A CN201910588362 A CN 201910588362A CN 110259426 A CN110259426 A CN 110259426A
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- 238000011156 evaluation Methods 0.000 title claims abstract description 22
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 36
- 239000000126 substance Substances 0.000 claims abstract description 35
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 6
- 208000004350 Strabismus Diseases 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 11
- 238000011161 development Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000012224 working solution Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
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- Life Sciences & Earth Sciences (AREA)
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Measuring Fluid Pressure (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention discloses pressures between a kind of unconventional platform well well to alter degree evaluation method, and key step is as follows: a variety of different types of chemical tracers of selection, the species number of chemical tracer are equal to the pressure break segments of injecting well；Each section of staged fracturing is injected separately into a kind of different chemical tracer；It is taken respectively in injecting well or so offset well well head and returns drain sample and record the sampling time, taken respectively in different time points and return drain sample and record the sampling time；The chemical tracer type and concentration that drain sample contains respectively are returned in detection, and statistics obtains returning for left and right offset well and detects that chemical tracer species number is N respectively in drain sampleL、NR, and the sample time T of various chemical tracers is detected for the first timebt；The pressure for calculating separately injecting well and left and right offset well alters index, and thus evaluation pressure alters degree.Evaluation method accuracy of the invention is high, and because entering well without instrument, equipment, tool, scene admission data manipulation is simple, easy, safe, will not delay the normal production of platform well.
Description
Technical field
The present invention relates to increasing yield of oil and natural gas technical field, in particular to pressure alters degree between a kind of unconventional platform well well
Evaluation method.
Background technique
When carrying out fracturing reform for the unconventional oil and gas reservoir of same platform well, adjacent well fracturing fracture or well excessively are naturally split
Seam may be connected to.A possibility that in the case where pressure break scale is certain, platform well well spacing is smaller, and offset well crack is connected to increases
Greatly, it is bigger that the degree for generating and interfering with each other normally is produced to oil gas, reduces the development effectiveness of platform.If platform well well spacing is got over
Greatly, a possibility that offset well crack is connected to is lower, and offset well production a possibility that interfering with each other is also lower, the development effectiveness of platform also compared with
It is good, but platform well well spacing is bigger, development rate can be lower.Therefore, palpus Optimization Platform well well spacing, makes in reasonable development
In velocity interval, development effectiveness is optimal.Pressure alters degree between quantitative assessment platform well well, can provide for Optimization Platform well well spacing
Important evidence.Currently, mainly utilizing inter-well pressure interference test test result, whether presses and alter between qualitative evaluation well, be both not allowed
Really, and during well testing delay the normal production of platform well.In this regard, the present invention provides press between a kind of unconventional platform well well
Alter degree evaluation method.
Summary of the invention
The purpose of the present invention is alter accuracy existing for the method for degree for pressure between existing quantitative assessment platform well well
Difference delays the deficiency of platform well normally produced during well testing；Pressure alters degree evaluation between providing a kind of unconventional platform well well
Method.
Pressure alters the evaluation method of degree between unconventional platform well well provided by the invention, and key step thinking is: when very
When advising platform well progress multistage pressure break, a kind of specific aqueous reaction tracer is injected ground with this section of hydraulic fracturing working solution
Layer.Unique different types of chemical tracer is injected to each section.After when the left and right of the well, tight adjacent well open flow returns row, exist respectively
This two mouthfuls of well well heads, which periodically take, returns drain sample, detects all return and infuses various chemical tracers in drain sample.According to detection
Coefficient is altered as a result, calculating according to specific formulation and calculating pressure, thus further evaluation pressure alters degree.Specifically comprise the following steps:
The species number of S1, a variety of different types of chemical tracers of selection, chemical tracer are equal to the pressure break point of injecting well
Number of segment.The chemical tracer selected is the microchemistry tracer that dissolves in fracturing fluid, and in the temperature of oil-gas reservoir, pressure condition
Lower stabilization, absorption are small, and detection limit environmentally friendly, low, very low without background concn or background concn does not influence the close of fracturing fluid
Degree；Chemical tracer species number is filtered out equal to pressure break number of segment.
S2, chemical tracer is injected to target zone together with fracturing fluid, each section of staged fracturing is injected separately into one kind not
Same chemical tracer.
S3, when injecting well or so offset well starts the row of returning in platform, in left and right, offset well well head takes respectively returns drain sample simultaneously
The sampling time is recorded, is taken respectively in different time points and is returned drain sample and record the sampling time；By following regulation sampling: from open flow
Drain starts, and in 5 days, samples by every 8h primary；It 6th day to the 15th day, is sampled by every 12h primary；It 16th day to the 30th day, presses
It is primary per sampling for 24 hours.
S4, detection respectively return the chemical tracer type and concentration that drain sample contains, and statistics obtains the row of returning of left and right offset well
Detect that chemical tracer species number is N respectively in liquid sampleL、NR, and the sampling of various chemical tracers is detected for the first time
Time Tbt。
S5, the pressure for calculating separately injecting well and left and right offset well alter index IFCL,IFCR；Calculation formula is as follows:
In formula: N is the chemical tracer species number of injecting well injection；
NL、NRThe chemical tracer species number detected in respectively left and right offset well；
TeFor sampling monitoring time, day；
Respectively left and right offset well returns pair that i-th kind of chemical tracer is detected for the first time in drain sample
Answer sample time；
Returning for respectively left and right offset well detects that the correspondence of chemical tracer takes for the first time in drain sample
The sample time, i.e.,
Pressure alters index IFCL, IFCRSize indicates that pressure alters degree, and it is 0 that pressure, which alters index, indicates to alter without pressure；Pressure alters index and is
1, indicate that pressure is altered completely；It is bigger that pressure alters index, and it is more serious to indicate that pressure alters degree.
Above-mentioned evaluation method is suitable for that need to carry out hydraulic fracturing unconventional shale oil-gas reservoir, fine and close oil-gas reservoir platform well
Level, squint oil/gas well.
Compared with prior art, the invention has the beneficial effects that:
The present invention provides pressures between a kind of new unconventional platform well well to alter degree evaluation method, and accuracy is high；Because not
Instrument, equipment, tool is needed to enter well, scene admission data manipulation is simple, easy, safe；The normal of platform well will not be delayed
Production.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1,1 three mouthfuls of shale gas well fracturing fractures of southwest and center area NH platform of embodiment and pressure alter schematic diagram.
Fig. 2, NH-1 well return tracer concentration curve in drain.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
One that pressure between unconventional platform well well of the invention is altered degree evaluation method has application case.
Southwest NH platform arranges 3 mouthfuls of shale gas wells: NH-1 well, NH-2 well, NH-3 well, NH-2 well point from left to right
31 sections of pressure breaks, are shown in Fig. 1.In order to evaluate NH-2 well, pressure alters degree between NH-1 well and NH-3 well respectively, has evaluated and screened 31 kinds
It is suitble to the water-soluble chemical tracer of the region reservoir, 31 kinds of tracers number #1, #2 ... #31 respectively is each in NH-2 well
A kind of selected tracer is injected when section pressure break, tracer number is corresponded with fracturing section segment number.Start in three mouthfuls of well drains
Afterwards, it is sampled respectively in NH-1 well and NH-3 well well head by the sampling plan being pre-designed, the sampling plan of recommendation is as follows: from open flow
Drain starts, and in 5 days, samples by every 8h primary；It 6th day to the 15th day, is sampled by every 12h primary；It 16th day to the 30th day, presses
It is primary per sampling for 24 hours.Then the concentration of tracer in each sample is detected.It is obtained in 50 fracturing outlet liquid samples from NH-1 well
It detects from NH-2 well and injects No. #2, No. #3, No. #5, No. 24 tracers, Fig. 2 is 4 kinds of tracer concentration curve graphs of detection.From
Known in figure:
N=31, NL=4, Te=30,
Above-mentioned data are substituted into formula by calculation method of the present invention,It is calculated: IFCL
=0.1287.
Illustrate there is pressure to alter between NH-2 well and NH-1 well, it is 0.1287 that pressure, which alters index, and it is weaker that pressure alters degree.
Similarly, pressure between NH-2 well and NH-3 well can be calculated to alter index (repeating no more its calculating process), evaluation pressure is altered
Degree.
In conclusion the present invention alters accuracy existing for the method for degree for pressure between existing quantitative assessment platform well well
Difference delays the deficiency of platform well normally produced during well testing；Pressure alters degree evaluation between providing a kind of unconventional platform well well
Method.This method accuracy is high；Instrument, equipment, tool G.I.H are not needed, scene admission data manipulation is simple, easy, peace
Entirely；The normal production of platform well will not be delayed.The evaluation method is suitable for need to be in unconventional shale oil-gas reservoir, fine and close oil-gas reservoir
Level, the squint oil/gas well of hydraulic fracturing are carried out in platform well.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (4)
1. pressure alters degree evaluation method between a kind of unconventional platform well well, which comprises the steps of:
S1, a variety of different types of chemical tracers of selection, the species number of chemical tracer are equal to the pressure break segments of injecting well；
S2, chemical tracer is injected to target zone together with fracturing fluid, each section of staged fracturing is injected separately into a kind of different
Chemical tracer；
S3, when injecting well or so offset well starts the row of returning in platform, in left and right, offset well well head takes respectively returns drain sample and records
Sampling time takes respectively in different time points and returns drain sample and record the sampling time；
The chemical tracer type and concentration that drain sample contains respectively are returned in S4, detection, and what statistics obtained left and right offset well returns drain sample
Detect that chemical tracer species number is N respectively in productL、NR, and the sample time of various chemical tracers is detected for the first time
Tbt；
S5, the pressure for calculating separately injecting well and left and right offset well alter index IFCL, IFCR；Calculation formula is as follows:
In formula: N is the chemical tracer species number of injecting well injection；
NL、NRThe chemical tracer species number detected in respectively left and right offset well；
TeFor sampling monitoring time, day；
The correspondence that i-th kind of chemical tracer is detected for the first time in drain sample of returning of respectively left and right offset well takes
The sample time；
When returning the corresponding sample for detecting chemical tracer in drain sample for the first time of respectively left and right offset well
Between, i.e.,
Pressure alters index IFCL, IFCRSize indicates that pressure alters degree, and it is 0 that pressure, which alters index, indicates to alter without pressure；It is 1 that pressure, which alters index, table
Show that pressure is altered completely；It is bigger that pressure alters index, and it is more serious to indicate that pressure alters degree.
2. pressure alters the evaluation method of degree between unconventional platform well well as described in claim 1, which is characterized in that step S3
In, by following regulation sampling: since open flow drain, in 5 days, being sampled by every 8h primary；It 6th day to the 15th day, is taken by every 12h
Sample is primary；16th day to the 30th day, by primary per sampling for 24 hours.
3. pressure alters the evaluation method of degree between unconventional platform well well as described in claim 1, which is characterized in that step S1
In, the chemical tracer that selects is the microchemistry tracer that dissolves in fracturing fluid, and under the temperature of oil-gas reservoir, pressure condition
Stablize, adsorbs small, environmentally friendly, low, very low without background concn or background concn detection limit, do not influence the close of fracturing fluid
Degree；Chemical tracer species number is filtered out equal to pressure break number of segment.
4. pressure alters the evaluation method of degree between unconventional platform well well as described in claim 1, which is characterized in that the evaluation side
Level, squint oil/gas well of the method suitable for hydraulic fracturing need to be carried out unconventional shale oil-gas reservoir, fine and close oil-gas reservoir platform well.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392456A (en) * | 2020-11-13 | 2021-02-23 | 中国石油天然气股份有限公司 | Well pattern layout rationality judgment method and well pattern layout optimization method |
| CN112990629A (en) * | 2019-12-17 | 2021-06-18 | 中国石油化工股份有限公司 | Unconventional oil and gas reservoir exploitation method and system |
| CN114233271A (en) * | 2021-12-16 | 2022-03-25 | 中国石油天然气集团有限公司 | Method for predicting inter-well communication in fracturing construction process and method for preventing fracturing channeling |
| CN117489296A (en) * | 2023-12-29 | 2024-02-02 | 克拉玛依市白碱滩区(克拉玛依高新区)石油工程现场(中试)实验室 | Inter-well channeling prevention method and simulation experiment device |
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| CN114233271A (en) * | 2021-12-16 | 2022-03-25 | 中国石油天然气集团有限公司 | Method for predicting inter-well communication in fracturing construction process and method for preventing fracturing channeling |
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