CN110376112A - A method of evaluating fine and close gas reservoir water blocking damage degree - Google Patents
A method of evaluating fine and close gas reservoir water blocking damage degree Download PDFInfo
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- CN110376112A CN110376112A CN201910687018.6A CN201910687018A CN110376112A CN 110376112 A CN110376112 A CN 110376112A CN 201910687018 A CN201910687018 A CN 201910687018A CN 110376112 A CN110376112 A CN 110376112A
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- sample
- gas reservoir
- damage degree
- water blocking
- close gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The present invention provides a kind of method for evaluating fine and close gas reservoir water blocking damage degree, comprising: obtains the irreducible water saturation S of samplewi；According to the Swi, obtain the infiltration loss ratio D of the samplek；According to the Dk, determine fine and close gas reservoir water blocking damage degree.
Description
Technical field
The invention belongs to oil-gas field development water based workover fluid technical field of operation, and in particular to a kind of fine and close gas reservoir of evaluation
The method of water blocking damage degree.
Background technique
Water-blocking effect is common problem in oil-gas field development, in operations such as drilling well, complete well, well workover and well stimulations
In all there is water-blocking effect to some extent, cause the oil/gas well underproduction even stop production.Therefore, study the influence of water-blocking effect because
Element finds the method for inhibiting and releasing water blocking damage, is of great importance to the development effectiveness for improving Low permeable oil and gas reservoirs.
Currently, common evaluation water blocking damage method depends on the changing value that water lock front and back permeability occurs, this
Method needs to take multiple measurements core permeability, not only consumes manpower and material resources, but also has measurement to limit, it is necessary to have phase
Close permeability determination device.There is also corresponding error conditions in terms of measurement result, have certain limitation, can not be to certain
The water lock degree of one block carries out Fast Evaluation.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
The method for stating the fine and close gas reservoir water blocking damage degree of evaluation of problem.
The embodiment of the present invention provides a kind of method for evaluating fine and close gas reservoir water blocking damage degree, comprising:
Obtain the irreducible water saturation S of samplewi；
According to the Swi, obtain the infiltration loss ratio D of the samplek；
According to the Dk, determine fine and close gas reservoir water blocking damage degree.
Further, the irreducible water saturation S for calculating core samplewiInclude:
Measure the T under the sample pressurization saturation state2Map T21；
Measure the nuclear magnetic resonance T when sample dry sample2Map T22；
According to the T21And T22, obtain the irreducible water saturation S of samplewi。
Further, described according to the T21And T22, obtain the irreducible water saturation S of samplewiInclude:
Make the T respectively21And T22T2Map cumulative porosity rate curve graph obtains T21Summation curve and T22Summation curve；
According to the T21Summation curve and T22Summation curve obtains the irreducible water saturation of the sample.
Further, described according to the T21Summation curve and T22Summation curve obtains the constraint water saturation of the sample
Degree includes:
With the T22The signal amplitude maximum value of summation curve be point of contact make horizontal tangent, obtain the tangent line with it is described
T21The intersection point of summation curve；
According to the intersection point, the corresponding relaxation time T of the intersection point is obtained2c；
The T2cThe saturated sample nuclear magnetic resonance T on the left side2The area and saturated sample nuclear magnetic resonance T of spectrum2The gross area of spectrum
Ratio be irreducible water saturation.
Further, the infiltration loss ratio D for obtaining the samplekInclude:
Dk=29.255*ln (Swi)-20.851
In formula, DkFor permeability damage rate, SwiFor irreducible water saturation.
Further, described according to the Dk, determine that fine and close gas reservoir water blocking damage degree is judged according to following table:
| Permeate loss ratio Dk, % | Water blocking damage degree |
| ≤5 | Nothing |
| 5-30 | It is weak |
| 30-50 | It is medium on the weak side |
| 50-70 | It is medium partially strong |
| ≥70 | By force |
One or more technical solutions in the embodiment of the present invention, have at least the following technical effects or advantages:
The method for evaluating fine and close gas reservoir water blocking damage degree is provided using the embodiment of the present invention, avoids the survey of permeability
Amount, save the cost, and it is also more macroscopical direct in the lock degree prediction of block water, a kind of close oil-gas reservoir reservoir water can be locked
Degree has the understanding of an entirety.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, identical component is indicated with identical reference pattern.In the accompanying drawings:
Fig. 1 is that constraint fluid and movable fluid calculate schematic diagram；
Fig. 2 is the relation schematic diagram between irreducible water saturation and permeability damage rate.
Specific embodiment
Below in conjunction with specific embodiment and embodiment, it is specifically described the present invention, advantages of the present invention and various effects
It thus will clearly present.It will be understood by those skilled in the art that these specific embodiments and embodiment are for illustrating
The present invention is not intended to limit the present invention.
Throughout the specification, unless otherwise specified, terms used herein are interpreted as usual in this field
Used meaning.Therefore, unless otherwise defined, all technical and scientific terms used herein has leads with belonging to the present invention
The identical meaning of the general understanding of field technique personnel.Contradiction if it exists, this specification are preferential.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention, can pass through
Market is commercially available or can be prepared by existing method.
Embodiment 1
The application provides a kind of method for evaluating fine and close gas reservoir water blocking damage degree, comprising:
Obtain the irreducible water saturation S of samplewi；
According to the Swi, obtain the infiltration loss ratio D of the samplek；
According to the Dk, determine fine and close gas reservoir water blocking damage degree.
In the application, the irreducible water saturation S for calculating core samplewiInclude:
Measure the T under the sample pressurization saturation state2Map T21；
Measure the nuclear magnetic resonance T when sample dry sample2Map T22；
According to the T21And T22, obtain the irreducible water saturation S of samplewi, as shown in Figure 1.
It is described according to the T in the application21And T22, obtain the irreducible water saturation S of samplewiInclude:
Make the T respectively21And T22T2Map cumulative porosity rate curve graph (as shown in Figure 1) obtains T21Summation curve and
T22Summation curve；
According to the T21Summation curve and T22Summation curve, with the T22The signal amplitude maximum value of summation curve is to cut
Point makees horizontal tangent, obtains the tangent line and the T21The intersection point of summation curve；
According to the intersection point, the corresponding relaxation time T of the intersection point is obtained2c；
T2cThe saturated sample nuclear magnetic resonance T on the left side2The area and saturated sample nuclear magnetic resonance T of spectrum2The ratio of the gross area of spectrum
Value is irreducible water saturation.
In the application, the infiltration loss ratio D for obtaining the samplekInclude:
Dk=29.255*ln (Swi)-20.851
In formula, DkFor permeability damage rate, SwiFor irreducible water saturation.
Tight sand gas reservoir is in power function correlativity between irreducible water saturation and permeability；With the increasing of permeability
Add, it is in logarithm correlativity that water blocking damage is smaller and smaller, and therefore, water saturation is related in logarithm to permeability damage rate rate
Relationship.According to above-mentioned theory, the scatter plot of permeability damage rate and irreducible water saturation variation is drawn, as shown in Figure 2.
It is described according to the D in the applicationk, determine that fine and close gas reservoir water blocking damage degree is judged according to following table:
| Permeate loss ratio Dk, % | Water blocking damage degree |
| ≤5 | Nothing |
| 5-30 | It is weak |
| 30-50 | It is medium on the weak side |
| 50-70 | It is medium partially strong |
| ≥70 | By force |
Permeability injury rate calculated result of 19 pieces of samples under irreducible water, as shown in table 2.
Table 2
Finally, it is to be noted that, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that include a series of elements process, method, article or equipment not only include those elements, but also
Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic
Element.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of method for evaluating fine and close gas reservoir water blocking damage degree characterized by comprising
Obtain the irreducible water saturation S of samplewi；
According to the Swi, obtain the infiltration loss ratio D of the samplek；
According to the Dk, determine fine and close gas reservoir water blocking damage degree.
2. a kind of method for evaluating fine and close gas reservoir water blocking damage degree according to claim 1, which is characterized in that described
Calculate the irreducible water saturation S of core samplewiInclude:
Measure the T under the sample pressurization saturation state2Map T21；
Measure the nuclear magnetic resonance T when sample dry sample2Map T22；
According to the T21And T22, obtain the irreducible water saturation S of samplewi。
3. a kind of method for evaluating fine and close gas reservoir water blocking damage degree according to claim 2, which is characterized in that described
According to the T21And T22, obtain the irreducible water saturation S of samplewiInclude:
Make the T respectively21And T22T2Map cumulative porosity rate curve graph obtains T21Summation curve and T22Summation curve；
According to the T21Summation curve and T22Summation curve obtains the irreducible water saturation of the sample.
4. a kind of method for evaluating fine and close gas reservoir water blocking damage degree according to claim 3, which is characterized in that described
According to the T21Summation curve and T22Summation curve, the irreducible water saturation for obtaining the sample include:
With the T22The signal amplitude maximum value of summation curve is that horizontal tangent is made at point of contact, obtains the tangent line and the T21It is accumulative
The intersection point of curve；
According to the intersection point, the corresponding relaxation time T of the intersection point is obtained2c；
The T2cThe saturated sample nuclear magnetic resonance T on the left side2The area and saturated sample nuclear magnetic resonance T of spectrum2The ratio of the gross area of spectrum
For irreducible water saturation.
5. a kind of method for evaluating fine and close gas reservoir water blocking damage degree according to claim 1, which is characterized in that described
Obtain the infiltration loss ratio D of the samplekInclude:
Dk=29.255*ln (Swi)-20.851
In formula, DkFor permeability damage rate, SwiFor irreducible water saturation.
6. a kind of method for evaluating fine and close gas reservoir water blocking damage degree according to claim 1, which is characterized in that described
According to the Dk, determine that fine and close gas reservoir water blocking damage degree is judged according to following table:
。
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| CN117269224A (en) * | 2023-11-21 | 2023-12-22 | 天津朔程科技有限公司 | Evaluation method and system for gas layer water lock injury |
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