CN110259426B - Method for evaluating pressure channeling degree between unconventional platform wells - Google Patents
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- 230000005465 channeling Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title description 10
- 239000000126 substance Substances 0.000 claims abstract description 38
- 238000005070 sampling Methods 0.000 claims abstract description 27
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000011156 evaluation Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000003079 shale oil Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000003111 delayed effect Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
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- 230000000694 effects Effects 0.000 description 3
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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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Abstract
The invention discloses an unconventional platform well interwell pressure channeling degree evaluation method, which mainly comprises the following steps: selecting a plurality of different types of chemical tracers, wherein the number of the types of the chemical tracers is equal to the number of fracturing sections of an agent injection well; injecting a different chemical tracer into each stage of staged fracturing respectively; respectively taking flowback liquid samples from adjacent well mouths on the left and right sides of an injection well and recording sampling time, and respectively taking the flowback liquid samples at different time points and recording the sampling time; detecting the types and concentrations of chemical tracers contained in the flowback fluid samples, and counting to obtain the number N of the types of the chemical tracers detected in the flowback fluid samples of the left adjacent well and the right adjacent wellL、NRAnd the sampling time T for the first detection of the various chemical tracersbt(ii) a And respectively calculating the pressure channeling indexes of the agent injection well and the left and right adjacent wells, thereby evaluating the pressure channeling degree. The evaluation method of the invention has high accuracy, and the field data recording operation is simple, easy and safe because no instrument, equipment or tool enters the well, and the normal production of the platform well can not be delayed.
Description
Technical Field
The invention relates to the technical field of oil and gas yield increase, in particular to an unconventional method for evaluating the pressure channeling degree between wells of a platform well.
Background
When fracturing reformation is carried out on unconventional oil and gas reservoirs of the same platform well, fracturing fractures of adjacent wells or natural fractures passing through the wells can be communicated. Under the condition of certain fracturing scale, the smaller the interval between the platform wells is, the more the possibility of the communication of the cracks of the adjacent wells is increased, the larger the degree of mutual interference generated on the normal production of oil gas is, and the development effect of the platform is reduced. If the interval between the platform wells is larger, the probability of the communication of the cracks of the adjacent wells is lower, the probability of the mutual interference of the production of the adjacent wells is lower, the development effect of the platform is better, but the interval between the platform wells is larger, and the development speed is lower. Therefore, the interval between the platform wells needs to be optimized, so that the development effect is optimal within a reasonable development speed range. And quantitatively evaluating the pressure channeling degree between the platform wells, and providing important basis for optimizing the spacing between the platform wells. At present, whether pressure channeling exists between wells is evaluated qualitatively by mainly utilizing a well testing result of pressure interference between wells, which is inaccurate and delays normal production of a platform well during well testing. Therefore, the invention provides an unconventional evaluation method for the pressure channeling degree between wells of a platform well.
Disclosure of Invention
The invention aims to overcome the defects that the existing method for quantitatively evaluating the pressure channeling degree between the platform wells is poor in accuracy and delays the normal production of the platform wells during well testing; provides an unconventional evaluation method for the pressure channeling degree between wells of a platform well.
The invention provides an unconventional evaluation method for the pressure channeling degree between wells of a platform, which mainly comprises the following steps: when the unconventional platform well is subjected to multi-stage fracturing, a specific water-phase chemical tracer is injected into the stratum along with the hydraulic fracturing working fluid of the stage. Each segment is injected with a unique different kind of chemical tracer. And after the left and right adjacent wells of the well are subjected to open flow and flowback, periodically taking flowback liquid samples from the well mouths of the two wells respectively, and detecting various chemical tracers injected into all flowback liquid samples. And calculating the pressure channeling coefficient according to a specific formula according to the detection result, thereby further evaluating the pressure channeling degree. The method specifically comprises the following steps:
and S1, selecting a plurality of different types of chemical tracers, wherein the number of the types of the chemical tracers is equal to the number of fracturing sections of the agent injection well. The selected chemical tracer is a trace chemical tracer which can be dissolved in the fracturing fluid, is stable under the conditions of temperature and pressure of an oil-gas reservoir, has small adsorption, is environment-friendly, has no background concentration or has low background concentration and very low detection limit, and does not influence the density of the fracturing fluid; and screening out the chemical tracer species number equal to the number of the fracturing stages.
And S2, injecting the chemical tracer and the fracturing fluid into a target layer, and respectively injecting a different chemical tracer into each stage of staged fracturing.
S3, when the adjacent wells on the left and right of the agent injection well in the platform start to flow back, respectively taking the flow back liquid samples at the well mouths of the adjacent wells on the left and right and recording the sampling time, and respectively taking the flow back liquid samples at different time points and recording the sampling time; sampling was as specified below: sampling every 8h within 5 days from the start of open flow and drainage; sampling every 12h from day 6 to day 15; samples were taken every 24h from day 16 to day 30.
S4, detecting the types and concentrations of chemical tracers contained in the flowback liquid samples, and counting to obtain N types of the detected chemical tracers in the flowback liquid samples of the left adjacent well and the right adjacent wellL、NRAnd the sampling time T for the first detection of the various chemical tracersbt。
S5, respectively calculating the pressure channeling indexes IFC of the agent injection well and the left and right adjacent wellsL,IFCR(ii) a The calculation formula is as follows:
in the formula: n is the number of chemical tracer species injected into the agent injection well;
NL、NRthe number of chemical tracer species detected in the left adjacent well and the right adjacent well respectively;
Temonitoring time for sampling, day;
Pressure channeling index IFCL，IFCRThe size indicates the pressure channeling degree, the pressure channeling index is 0, and the pressure channeling is not existed; the pressure channeling index is 1, which indicates complete pressure channeling; the larger the pressure channeling index is, the more severe the pressure channeling is.
The evaluation method is suitable for horizontal and inclined oil and gas wells which need hydraulic fracturing in unconventional shale oil and gas reservoirs and compact oil and gas reservoir platform wells.
Compared with the prior art, the invention has the advantages that:
the invention provides a novel method for evaluating the pressure channeling degree between unconventional platform wells, which has high accuracy; because instruments, equipment and tools are not needed to enter the well, the field data recording operation is simple, easy and safe; normal production of the platform well is not delayed.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 and a schematic diagram of fracturing fractures and channeling of three NH platform shale gas wells in the southwest area of example 1.
FIG. 2, Tracer concentration curves in NH-1 well flowback fluids.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The unconventional platform well-to-well pressure channeling degree evaluation method has an application case.
The NH platform of the southwest area arranges 3 shale gas wells from left to right: NH-1 well, NH-2 well, NH-3 well, NH-2 well divide into 31 sections fracturing, see figure 1. In order to evaluate the pressure channeling degree between the NH-2 well and the NH-1 well and between the NH-3 well, 31 water-soluble chemical tracers suitable for reservoirs in the region are evaluated and screened, wherein the 31 tracers are respectively numbered in #1 and #2 … … #31, a selected tracer is injected during fracturing of each section of the NH-2 well, and the numbers of the tracers correspond to the sections of the fracturing sections one by one. After three-well drainage is started, sampling is respectively carried out on the well heads of the NH-1 well and the NH-3 well according to a pre-designed sampling scheme, wherein the recommended sampling scheme is as follows: sampling every 8h within 5 days from the start of open flow and drainage; sampling every 12h from day 6 to day 15; samples were taken every 24h from day 16 to day 30. The concentration of the tracer in each sample is then detected. The #2 #3 #5 # 24 tracers injected from the NH-2 well were detected in 50 samples of frac flowback fluid taken from the NH-1 well, and FIG. 2 is a graph of the concentration of the 4 detected tracers. As can be seen from the figure:
N＝31，NL＝4，Te＝30，
the above data are substituted into the formula according to the calculation method of the invention,
and calculating to obtain: IFCL＝0.1287。
The pressure channeling between the NH-2 well and the NH-1 well is illustrated, the pressure channeling index is 0.1287, and the pressure channeling degree is weaker.
Similarly, the pressure channeling index between the NH-2 well and the NH-3 well can be calculated (the calculation process is not repeated), and the pressure channeling degree can be evaluated.
In conclusion, the method aims at the defects that the existing method for quantitatively evaluating the pressure channeling degree between the platform wells is poor in accuracy and delays the normal production of the platform wells during well testing; provides an unconventional evaluation method for the pressure channeling degree between wells of a platform well. The method has high accuracy; instruments, equipment and tools are not needed to be put into the well, and the operation of field data recording is simple, easy and safe; normal production of the platform well is not delayed. The evaluation method is suitable for horizontal and inclined oil and gas wells which need hydraulic fracturing in unconventional shale oil and gas reservoirs and compact oil and gas reservoir platform wells.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The unconventional platform well-to-well pressure channeling degree evaluation method is characterized by comprising the following steps of:
s1, selecting a plurality of different chemical tracers, wherein the number of the chemical tracers is equal to the number of fracturing sections of the agent injection well;
s2, injecting a chemical tracer and fracturing fluid into a target layer together, and injecting a different chemical tracer into each stage of staged fracturing respectively;
s3, when the adjacent wells start to flow back in the left and right injection wells in the platform, respectively taking the flow-back liquid samples and recording the sampling time at the well mouths of the left and right adjacent wells, respectively taking the flow-back liquid samples and recording the sampling time at different time points, and sampling according to the following regulations: sampling every 8h within 5 days from the start of open flow and drainage; sampling every 12h from day 6 to day 15; sampling every 24h from day 16 to day 30;
s4, detecting the types and concentrations of chemical tracers contained in the flowback liquid samples, and counting to obtain N types of the detected chemical tracers in the flowback liquid samples of the left adjacent well and the right adjacent wellL、NRAnd the sampling time T for the first detection of the various chemical tracersbt；
S5, respectively calculating the pressure channeling indexes IFC of the agent injection well and the left and right adjacent wellsL，IFCR(ii) a The calculation formula is as follows:
in the formula: n is the number of chemical tracer species injected into the agent injection well;
NL、NRthe number of chemical tracer species detected in the left adjacent well and the right adjacent well respectively;
Temonitoring time for sampling, day;
Pressure channeling index IFCL，IFCRThe size indicates the pressure channeling degree, the pressure channeling index is 0, and the pressure channeling is not existed; the pressure channeling index is 1, which indicates complete pressure channeling; the larger the pressure channeling index is, the more severe the pressure channeling is.
2. The unconventional platform well-to-well pressure channeling degree evaluation method according to claim 1, wherein in step S1, the selected chemical tracer is a trace chemical tracer soluble in the fracturing fluid, and is stable under the conditions of temperature and pressure of the oil and gas reservoir, has small adsorption, is environmentally friendly, has no background concentration or low background concentration, has very low detection limit, and does not affect the density of the fracturing fluid; and screening out the chemical tracer species number equal to the number of the fracturing stages.
3. The unconventional platform well-to-well pressure channeling degree evaluation method according to claim 1, wherein the evaluation method is suitable for horizontal and inclined oil and gas wells which need hydraulic fracturing in unconventional shale oil and gas reservoir and compact oil and gas reservoir platform wells.
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| CN112990629B (en) * | 2019-12-17 | 2024-03-29 | 中国石油化工股份有限公司 | Unconventional oil and gas reservoir exploitation method and unconventional oil and gas reservoir exploitation system |
| CN112392456B (en) * | 2020-11-13 | 2023-07-25 | 中国石油天然气股份有限公司 | Well pattern layout rationality judging method and well pattern layout optimizing method |
| 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 |
| CN117489296B (en) * | 2023-12-29 | 2024-03-22 | 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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