CN104500047A - Method for evaluating fracturing effects by analyzing tracers in multi-section fracturing flow-back fluid - Google Patents
Method for evaluating fracturing effects by analyzing tracers in multi-section fracturing flow-back fluid Download PDFInfo
- Publication number
- CN104500047A CN104500047A CN201410850962.6A CN201410850962A CN104500047A CN 104500047 A CN104500047 A CN 104500047A CN 201410850962 A CN201410850962 A CN 201410850962A CN 104500047 A CN104500047 A CN 104500047A
- Authority
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- China
- Prior art keywords
- sample
- fracturing
- filter
- adsorbent equipment
- backflow
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention provides a method for evaluating fracturing effects by analyzing tracers in a multi-section fracturing flow-back fluid. The method comprises the steps of sampling in an oil producing well and treating the sample, detecting the concentration of each tracer in the treated flow-back fracturing fluid, and evaluating the fracturing effect of each layer according to the concentrations of the tracers. The fracturing conditions judged by use of the method are visual and accurate, quantitative and low in error, and have an important guiding effect on the fracturing of the sections of the same layer; the design scheme is optimized for the conditions of different stratums; as a result, the fracturing efficiency is improved and the cost is reduced.
Description
Technical field
The present invention relates to the correlation technique in fracturing fluid recovery (backflow) spike field, specifically a kind of the method for fracturing effect is evaluated to probe material analysis in multistage fracturing fluid recovery (backflow) liquid.
Background technology
The large-scale development of current horizontal well, multi-layer multi-stage pressure break is the first-selected technique of stratum transformation, but does not have specific aim in the process of layer position selection.In the process of pressure break, especially in prospect pit, be all to select layering by experience.Therefore post-fracturing Data acquisition and issuance fracturing effect is just seemed particularly important.
Can by fracture intensity after the monitoring such as micro seismic method, potentiometry and analysis pressure break in prior art, but all there is complex process, high in cost of production shortcoming, and often because strata condition is complicated, disturbing factor is many, be difficult to explain accurately every layer of situation.In staged fracturing of horizontal well in the past, only can recognize and return lifting rate by returning discharge opeing and whether have oil to have liquid, and specifically cannot judge fracturing effect and the fluid situation of each interval.
About the tracer technique of fracturing outlet liquid, also seldom, just selected the conducts such as chlorion mineral ion with reference to target, accuracy of detection is low, disturbing factor is many in the past, just as supplementary means reference for current correlative study report both domestic and external.And the layering spike of multistage fracturing has no especially and first closes report.
Summary of the invention
Main purpose of the present invention is to provide a kind of probe material of analyzing in multistage fracturing fluid recovery (backflow) liquid to evaluate the method for fracturing effect.
For achieving the above object, the present invention is mainly in multistage fracturing outlet liquid, and periodic detection returns the change of tracer concentration in discharge opeing, then by the amount of accumulation tracer with return that isostere is long-pending judges the row's of returning situation, and then understand each layer of fracturing effect, reach the object evaluating fracturing effect.
The invention provides and analyze in multistage fracturing fluid recovery (backflow) liquid that probe material is to evaluate the method for fracturing effect, the method comprises:
(1) sample in producing well and carry out sample treatment;
(2) concentration returning various probe material in discharge fracturing fluid after check processing;
(3) according to the concentration of probe material, the fracturing effect of every layer is evaluated.
According to specific embodiment of the invention scheme, in method of the present invention, described sample handling procedure comprises: filter impurity Instrument measuring being caused to interference, drip washing by clearing up, adsorbing, excessively.
According to specific embodiment of the invention scheme, in method of the present invention, described sample handling procedure utilizes a kind of fracturing fluid recovery (backflow) liquid sample processing device, and this device comprises the digestion instrument, adsorbent equipment and the filter that are connected in series by pipeline; Digestion instrument is the container of accommodating fracturing fluid recovery (backflow) liquid sample, and its top is provided with injection port, H
2o
2import, N
2pass into mouth and gas vent; Adsorbent equipment top arranges inlet, and bottom arranges liquid outlet, is filled with adsorbing medium in adsorbent equipment; Filter top arranges inlet, bottom is provided with tap hole, in filter, medium position arranges 0.45 μm of filter membrane, filter membrane top is liquid to be filtered body space, bottom is filtered fluid space, and filter is also configured with vacuum extractor, provide filtration power for being vacuumized filter membrane bottom; Pipeline between digestion instrument and adsorbent equipment is provided with the first valve; Pipeline between adsorbent equipment and filter is provided with the second valve; The tap hole place of filter arranges the 3rd valve;
Described fracturing fluid recovery (backflow) liquid sample treatment comprises:
Sample is added in digestion instrument, by H by injection port
2o
2import adds H
2o
2, and by N
2pass into mouth to continue to pass into nitrogen in sample, make sample and H
2o
2abundant reaction is cleared up;
Open the first valve, the second valve, open vacuum pump and bleed, rear sample suction adsorbent equipment will be cleared up, remove organic colored impurity;
Sample, by adsorbent equipment suction filter, by 0.45 μm of filter membrane, removes the mechanical admixture of particle diameter more than 0.45 μm.
According to specific embodiment of the invention scheme, in sample handling procedure of the present invention, every 20ml fracturing fluid recovery (backflow) liquid sample, add the hydrogen peroxide of 80 ~ 120ml preferred 100ml 30% concentration, can be at normal temperature and pressure or suitable rising pressure environment react 5-7min under keeping passing into the condition of nitrogen, make sample and H
2o
2abundant reaction is cleared up.
According to specific embodiment of the invention scheme, in sample handling procedure of the present invention, be in digestion instrument, pass into nitrogen with the pressure of 0.25 ~ 0.35MPa.The time that passes into that continues of nitrogen should comprise sample and H
2o
2the whole process of abundant reaction, preferably continuing in the present invention to pass into nitrogen is 10 ~ 25min.The experimental study of inventor proves, passes into N with described pressure in digestion instrument
2can except part O contained in anhydrating
2and certain protective effect can be played to the tracer complex compound in sample.
According to specific embodiment of the invention scheme, in sample handling procedure of the present invention, described adsorbing medium is the mixture of macroporous absorbent resin and active carbon.More specifically, described macroporous absorbent resin can comprise macroporous cross-linked polystyrene polymeric adsorbent and/or acrylic resin.The all commercially available acquisition of these resins can be the macroporous absorbent resin of modification or not modification.
According to specific embodiment of the invention scheme, in sample handling procedure of the present invention, described active carbon is 2 ~ 20 object active carbons, is preferably 4 ~ 14 object active carbons.
According to specific embodiment of the invention scheme, in sample handling procedure of the present invention, described macroporous absorbent resin and the active carbon filling mass ratio in adsorbent equipment is 4 ~ 5:5 ~ 4.More specifically, described macroporous absorbent resin and active carbon can be loaded in adsorbent equipment after mixing, and also can be that a point interval is loaded in adsorbent equipment.
Be appreciated that in sample handling procedure of the present invention, the loadings of described adsorbing medium can be determined according to adsorbent equipment capacity and pending liquid measure.
According to specific embodiment of the invention scheme, method of the present invention, in step (2) be with after ICP-MS check processing fracturing fluid recovery (backflow) liquid in the concentration of spike goods and materials.
According to specific embodiment of the invention scheme, method of the present invention, also comprises the amount of monitoring accumulation tracer and returns isostere and amass in step (2).
The pressure break situation that method of the present invention judges is intuitively accurate, and can be quantitative, and error is little, has important directive function to the fracture job of same interval, for the situation optimizing design scheme of Different Strata, improves pressure break efficiency, reduces costs.The fluid situation of every layer is also important first-hand data to production in the future, can determine main extraction layer.
Accompanying drawing explanation
Fig. 1 is the structural representation of fracturing fluid recovery (backflow) liquid sample processing device used in method of the present invention.
Detailed description of the invention
Describe the enforcement of technical solution of the present invention and the beneficial effect that has in detail below by way of specific embodiment, but can not regard as to of the present invention can any restriction of practical range.
Embodiment 1
1, sample: directly get fracturing outlet liquid from the sample tap of oil well.
2, sample treatment:
Shown in Figure 1, fracturing fluid recovery (backflow) liquid sample processing device of the present invention comprises the digestion instrument 1, adsorbent equipment 2 and the filter 3 that are connected in series by pipeline.Digestion instrument 1 is provided with injection port 11, H
2o
2import, N
2pass into mouth 12 and gas vent 13, pipeline between digestion instrument 1 and adsorbent equipment 2 is provided with the first valve 12, pipeline between adsorbent equipment 2 and filter 3 is provided with the second valve 23, and filter 3 arranges 0.45 μm of filter membrane 31, also be provided with tap hole, tap hole place arranges the 3rd valve 33, and filter is also configured with vacuum extractor (vacuum pump) 32.
When utilizing the device of the present embodiment to process fracturing fluid recovery (backflow) liquid sample, can carry out according to following operation:
20mL sample is added in digestion instrument, by H by injection port
2o
2mouth adds the H of 100mL 30% concentration
2o
2, do not stop to pass into N in a device with 0.3MPa pressure simultaneously
2(logical N
2shi Changyue 20min), react 5-7min at normal temperatures and pressures and make sample and H
2o
2abundant reaction is cleared up;
Open the first valve, the second valve, open vacuum pump to bleed, to rear sample suction be cleared up be equipped with the adsorbent equipment of mixed fillers, in adsorbent equipment, use the macroporous cross-linked polystyrene polymeric adsorbent that is purchased and active carbon (4-14 order) according to the mixing and absorption filler 20mL of mass ratio 5:4 as adsorbing medium; Sample solution after clearing up is by removing organic colored impurity in adsorbent equipment;
Sample, by adsorbent equipment suction filter, by 0.45 μm of filter membrane, removes the mechanical admixture of particle diameter more than 0.45 μm.
After sample is all by filter membrane, open the 3rd valve, sample will be handled well and released by tap hole, and complete whole pretreatment process.
When not connecting digestion instrument and adsorbent equipment (fracturing fluid recovery (backflow) liquid is by means of only filter), measure the rate of recovery data of slight trace agent in fracturing fluid recovery (backflow) liquid as following table:
| Tracer element | Nd | Sm | Dy | Yb |
| The rate of recovery, % | 82 | 83 | 83 | 85 |
When only connecting digestion instrument of the present invention and filter, measure the rate of recovery data of slight trace agent in fracturing fluid recovery (backflow) liquid as following table:
| Tracer element | Nd | Sm | Dy | Yb |
| The rate of recovery, % | 92 | 91 | 92 | 93 |
When connecting digestion instrument of the present invention and adsorbent equipment and filter at the same time, measure the rate of recovery data of slight trace agent in fracturing fluid recovery (backflow) liquid as following table:
| Tracer element | Nd | Sm | Dy | Yb |
| The rate of recovery, % | 96 | 96 | 97 | 97 |
Device of the present invention effectively can carry out pre-treatment to fracturing fluid recovery (backflow) liquid sample as can be seen here, makes it the requirement meeting next step Instrumental Analysis.
Below the present invention's some experimental datas in research process, wherein except the condition indicated especially, the same above-described embodiment of other conditions.
(1) nitrogen and the part test not passing into nitrogen is passed into
When not passing into nitrogen, measure the rate of recovery data of slight trace agent in fracturing fluid recovery (backflow) liquid as following table:
| Tracer element | Nd | Sm | Dy | Yb |
| The rate of recovery, % | 95 | 96 | 95 | 96 |
When passing into nitrogen 15min with 0.35MPa pressure, measure the rate of recovery data of slight trace agent in fracturing fluid recovery (backflow) liquid as following table:
| Tracer element | Nd | Sm | Dy | Yb |
| The rate of recovery, % | 96 | 96 | 97 | 97 |
Pass into nitrogen except partial oxidation contained in anhydrating as seen, have certain protective effect to the tracer complex compound in sample.
(2) part test of different adsorbing medium
In adsorbent equipment, use phenolic resins as absorption material, measure the rate of recovery data of slight trace agent in fracturing fluid recovery (backflow) liquid as following table:
| Tracer element | Nd | Sm | Dy | Yb |
| The rate of recovery, % | 85 | 86 | 85 | 88 |
In adsorbent equipment, use activated alumina as absorption material, measure the rate of recovery data of slight trace agent in fracturing fluid recovery (backflow) liquid as following table:
| Tracer element | Nd | Sm | Dy | Yb |
| The rate of recovery, % | 87 | 85 | 87 | 88 |
Acrylic acid series macroporous absorbent resin (the prosperous smooth board resin D113 type of Dacheng County prosperous photoinitiator chemical Co., Ltd) and active carbon (Zhengzhou bamboo grove active carbon development corporation, Ltd. is used in adsorbent equipment, oil absorbent active carbon, 4-14 order) mixing and absorption filler as adsorbing medium, both ratio 4:5, measure the rate of recovery data of slight trace agent in fracturing fluid recovery (backflow) liquid as following table:
| Tracer element | Nd | Sm | Dy | Yb |
| The rate of recovery, % | 96 | 96 | 97 | 97 |
The mixing and absorption filler of visible macroporous cross-linked polystyrene type polymeric adsorbent and active carbon is the filler being suitable for fracturing fluid recovery (backflow) liquid of the present invention process.
In addition, in above-mentioned test, mixing and absorption medium 20mL of the present invention, can recycle, calculate to process 20 ~ 50mL fracturing fluid recovery (backflow) liquid sample at every turn, 50 ~ 150 times can be processed, the basic indifference of the rate of recovery of slight trace agent in each test gained fracturing fluid recovery (backflow) liquid.
3, after ICP-MS check processing fracturing fluid recovery (backflow) liquid in the experimental procedure of concentration of spike goods and materials:
(1) Ar atmospheric pressure is adjusted to 0.6MPa, starts shooting ICP-MS analysis precision to debug and analyzes testing requirement: machine vacuumizes, and makes vacuum reach inspect by instrument requirement; The sample lifting time is set as 15-20s; Analytical element is spike rare earth element; Scanning times is set as 3; Method is set as that total quality scans; Editor's sample message also establishes calibration solution concentration; Instrument igniting carries out sample analysis by prompting.(distinct device parameter is different.)
(2) accurately with after ICP-MS check processing fracturing fluid recovery (backflow) liquid in the concentration of spike goods and materials.The method sensitivity reaches ppt (10
-12) order of magnitude.
4, according to the concentration of probe material, or further according to monitoring the amount of accumulation tracer and returning isostere volume data, the fracturing effect of every layer is evaluated.Concrete evaluation can be carried out with reference to the prior art in affiliated field.
Claims (10)
1. analyze in multistage fracturing fluid recovery (backflow) liquid that probe material is to evaluate a method for fracturing effect, the method comprising the steps of:
(1) sample in producing well and carry out sample treatment;
(2) concentration returning various probe material in discharge fracturing fluid after check processing;
(3) according to the concentration of probe material, the fracturing effect of every layer is evaluated.
2. method according to claim 1, wherein, described sample handling procedure comprises: filter impurity Instrument measuring being caused to interference, drip washing by clearing up, adsorbing, excessively.
3. method according to claim 1, wherein, described sample handling procedure utilizes a kind of fracturing fluid recovery (backflow) liquid sample processing device, and this device comprises the digestion instrument, adsorbent equipment and the filter that are connected in series by pipeline; Digestion instrument is the container of accommodating fracturing fluid recovery (backflow) liquid sample, and its top is provided with injection port, H
2o
2import, N
2pass into mouth and gas vent; Adsorbent equipment top arranges inlet, and bottom arranges liquid outlet, is filled with adsorbing medium in adsorbent equipment; Filter top arranges inlet, bottom is provided with tap hole, in filter, medium position arranges 0.45 μm of filter membrane, filter membrane top is liquid to be filtered body space, bottom is filtered fluid space, and filter is also configured with vacuum extractor, provide filtration power for being vacuumized filter membrane bottom; Pipeline between digestion instrument and adsorbent equipment is provided with the first valve; Pipeline between adsorbent equipment and filter is provided with the second valve; The tap hole place of filter arranges the 3rd valve;
Described fracturing fluid recovery (backflow) liquid sample treatment comprises:
Sample is added in digestion instrument, by H by injection port
2o
2import adds H
2o
2, and by N
2pass into mouth to continue to pass into nitrogen in sample, make sample and H
2o
2abundant reaction is cleared up;
Open the first valve, the second valve, open vacuum pump and bleed, rear sample suction adsorbent equipment will be cleared up, remove organic colored impurity;
Sample, by adsorbent equipment suction filter, by 0.45 μm of filter membrane, removes the mechanical admixture of particle diameter more than 0.45 μm.
4. method according to claim 3, wherein, every 20ml fracturing fluid recovery (backflow) liquid sample, adds the hydrogen peroxide of 80 ~ 120ml30% concentration, and reacts 5 ~ 7min under normal temperature and pressure keeps passing into the condition of nitrogen, makes sample and H
2o
2abundant reaction is cleared up.
5. the method according to claim 3 or 4 wherein, is in digestion instrument, pass into nitrogen with the pressure of 0.25 ~ 0.35MPa.
6. method according to claim 3, wherein, described adsorbing medium comprises macroporous absorbent resin and active carbon; Preferably, described macroporous absorbent resin comprises macroporous cross-linked polystyrene polymeric adsorbent and/or acrylic resin; Described active carbon is 2 ~ 20 object active carbons.
7. method according to claim 6, wherein, described macroporous absorbent resin and the active carbon filling mass ratio in adsorbent equipment is 4 ~ 5:5 ~ 4.
8. method according to claim 6, wherein, loads after described macroporous absorbent resin mixes with active carbon or divides an interval to be loaded in adsorbent equipment.
9. method according to claim 1, wherein, in step (2) be with after ICP-MS check processing fracturing fluid recovery (backflow) liquid in the concentration of spike goods and materials.
10. method according to claim 1, wherein, also comprises the amount of monitoring accumulation tracer and returns isostere and amass in step (2).
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|---|---|---|---|
| CN201410850962.6A CN104500047B (en) | 2014-12-31 | 2014-12-31 | Probe material is to evaluate the method for fracturing effect in analysis multistage fracturing fluid recovery (backflow) liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410850962.6A CN104500047B (en) | 2014-12-31 | 2014-12-31 | Probe material is to evaluate the method for fracturing effect in analysis multistage fracturing fluid recovery (backflow) liquid |
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|---|---|
| CN104500047A true CN104500047A (en) | 2015-04-08 |
| CN104500047B CN104500047B (en) | 2017-12-01 |
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|---|---|---|---|
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| CN113513314A (en) * | 2020-03-27 | 2021-10-19 | 吉奥斯普里特有限责任公司 | Quantitative and qualitative evaluation method for gas production in multiphase flow after multi-stage hydraulic fracturing |
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| CN108009716B (en) * | 2017-11-28 | 2020-06-30 | 西南石油大学 | Multi-level evaluation method for influence factors of horizontal well volume fracturing effect |
| CN113513314A (en) * | 2020-03-27 | 2021-10-19 | 吉奥斯普里特有限责任公司 | Quantitative and qualitative evaluation method for gas production in multiphase flow after multi-stage hydraulic fracturing |
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|---|---|
| CN104500047B (en) | 2017-12-01 |
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