CN107631974B - A kind of tight sand is sealed with wax the acquisition methods of rock core water containing saturability - Google Patents
A kind of tight sand is sealed with wax the acquisition methods of rock core water containing saturability Download PDFInfo
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- CN107631974B CN107631974B CN201710799738.2A CN201710799738A CN107631974B CN 107631974 B CN107631974 B CN 107631974B CN 201710799738 A CN201710799738 A CN 201710799738A CN 107631974 B CN107631974 B CN 107631974B
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Abstract
It seals with wax the acquisition methods of rock core water containing saturability the present invention relates to a kind of tight sand, belong to field of petroleum exploitation, the present invention is by being added pressurized tank for real well mud on ground, added with the colored ink for distinguishing between colors in mud, nitrogen, which is added in pressurized tank, using pressure pump makes the pressure in pressurized tank maintain preset pressure, then maintain pressurized tank in pressure for a period of time, therefore the present invention can be with the process of mud filtrate intrusion rock core during accurate simulation drilling and coring delivery, and the depth of mud filtrate intrusion rock core is observed by color with can be convenient, for special hypotonic prepare with compact sandstone gas layer original water saturation is measured in subsequent boring sample not by rock core that mud filtrate infects, the present invention is using full diameter tight sand core sample of sealing with wax instead of the full diameter tight sand core sample of sealing core drilling, it drops significantly The cost of low hypotonic and Methed of Tight Sandstone Gas Layers water saturation measurement.
Description
Technical field
It seals with wax the acquisition methods of rock core water containing saturability the present invention relates to a kind of tight sand, belongs to field of petroleum exploitation.
Background technique
The original water saturation of natural gas pool is the fundamental parameter that reserves calculate.The original water saturation of reservoir is
Original water flooding volume occupies the percentage for imitating pore volume in reservoir in the original state, and water saturation is usually true in reservoir
Fixed method has: rock core Direct Determination, rock core capillary pressure curve determine method and Indirect Calculation Method.
Rock core capillary pressure curve is obtained by simulating the principle of underground air water displacement process in the lab, is led
Method is wanted to have: 1. semi-permeable plate method, its advantage is that can be by establishing water saturation state come approximate simulation natural gas pool
Actual conditions, precision is high, the disadvantage is that time of measuring is too long and hypotonic difficult with air water displacement in tight sand in spy；2. pressing mercury
Method, it has the characteristics that test fast, accurately, but mercury air system has very big difference with air water system after all, can be to result band
To influence；3. centrifugal process, it can directly simulate natural gas pool air water system, but very due to centrifuge speed and centrifugation time selection
Difficulty often will cause very big error, more not applicable to the special hypotonic measurement with original water saturation in Methed of Tight Sandstone Gas Layers.
There are two types of indirect calculating methods: the original water saturation of reservoir and reservoir properties 1. directly measured using rock core is provided
Material, directly establishes the relationship of reservoir parameter and water saturation；2. the features such as physical property, lithology and log according to reservoir,
The electrical conduction model for establishing reservoir determines reservoir water saturation using the model.Fine and close gas reservoir water saturation calculating faces
The difficulty of two aspects: first is that water saturation accounting equation such as A Erqi, Indonesia's formula etc. used by usually are
It is based on middle high hole, seeps the experiment of reservoir and propose, its is poor for applicability for the fine and close gas reservoirs of Complicated Pore Structures, needs again
Water saturation equation adaptable therewith is established, but difficult；Two assume that existing water saturation equation is substantially applicable in
In fine and close gas reservoir, amendment appropriate only is carried out to wherein parameter, but this will be established on the deep rock-electric test basis of system
On, probe into the litho-electric parameters changing rule of different pore structures reservoir.
Rock core Direct Determination is most basic method, is the basic data for obtaining original water saturation, Qi Tafang
Method should all use the result of this method as explanation benchmark.Since rock core Direct Determination requires measured rock core that must protect
Holding is not influenced by drilling mud filtrate, so that the water saturation of experiment measurement is closer to the true water saturation in stratum, In
Rock core is needed during taking out using sealing core drilling mode, and sealing core drilling mode is with high costs, can not be applied on a large scale.Cause
This measures water saturation instead of sealing core drilling sample using core sample is sealed with wax in practice to reduce coring expense, as
Compact sandstone gas layer original water saturation, and then original gas saturation is calculated, key therein is core sample of sealing with wax
It cannot be by the intrusion effect of drilling mud filtrate.
In drilling process, in drilling mud filtrate meeting invaded formation and rock core.It is one that mud filtrate, which invades oil and gas reservoir,
The physical process of a complexity is influenced by many factors such as formation physical property, properties of fluid in bearing stratum, mud property, well site situations, tool
It says to body, is exactly and fluid column in reservoir permeability, reservoir porosity, mud filtrate property, well and reservoir pressure be poor, mud soaking
Time, the factors such as liquid diffusion convection current of mud and reservoir fluid density contrast, capillary pressure and different salinities are related.Mesh
Before, mainly utilize resistivity dynamic response method for numerical simulation, be finally inversed by stratum flushed zone resistivity, true formation resistivity and
Invasion radius, precision depend on many factors.Since physical property of tight sandstone reservoir is poor, complex pore structure, heterogeneity are strong,
There are larger differences for high hole infiltration sandstone reservoir in mud filtrate intrusion rule and routine, and influence material elements and the inherence of intrusion
Mechanism is not known, is difficult to determine depth of invasion using the method for numerical simulation.
Summary of the invention
The problem of for background technique, it is an object of the invention to propose a kind of easy to operate and can simulate true
The tight sand of real mud filtrate depth of invasion is sealed with wax the acquisition methods of rock core water containing saturability.
To achieve the above object, the rock core water containing saturability the invention adopts the following technical scheme: a kind of tight sand is sealed with wax
Acquisition methods, comprising the following steps:
1) High Purity Nitrogen gas cylinder, hand-operating pressure pump, pressure valve, pressure gauge and pressurized tank are sequentially connected with；
2) the full diameter tight sand core sample that will seal with wax obtains full diameter tight sand core sample after removing wax, using baking
Dry equipment is dried to full diameter tight sand core sample, weighs sample dry weight after cooling, measures rock using helium method
Heart porosity and permeability；
3) full diameter tight sand core sample is fixed on pressure pot bottom；
4) by added with the experiment of color ink is distinguished in drilling mud injection pressure tank, the liquid level of drilling mud covers complete straight
The top of diameter tight sand core sample, confining pressure tank；
5) add nitrogen in pressurized tank using hand-operating pressure pump, after reaching design value formation pressure stop that nitrogen is added, and
Pressure valve is closed, allows pressurized tank that its internal pressure is made to be in design value formation pressure in the given time under static condition；
6) pressure valve pressure release is opened, takes out after full diameter tight sand core sample cleans out surface mud, weighs sample
Product weight in wet base；
7) full diameter tight sand core sample is dried and is splitted, observe and measure red ink depth of invasion, by red ink
Water depth of invasion is denoted as drilling mud filtrate depth of invasion；
8) 2)~7 the full diameter tight sand core sample of sealing with wax for replacing Different porosities, repeats the above steps), it obtains
The graph of relation of mud filtrate depth of invasion and full-hole core porosity；
9) relation curve of mud filtrate depth of invasion and full-hole core porosity according to obtained in step 8), to bore
The plunger rock sample not invaded by mud filtrate is taken, water saturation measurement is carried out, the water saturation measured value measured is considered
The true water saturation of Methed of Tight Sandstone Gas Layers.
In the step 1), pressurized tank is cylindrical full-hole core clamper, is provided on pressurized tank for monitoring pressure
The precision of the pressure gauge of power tank internal pressure, electronic balance is not less than 0.01g.
In the step 4), the color of ink is red, and the injection rate of experiment drilling mud can just flood complete straight
Diameter tight sand core sample is best.
Experiment is 1:20 with the ratio of red ink in drilling mud and drilling mud in the step 4).
In the step 5), the predetermined time is two hours, and design value formation pressure is 14MPa.
In the step 7), red ink depth of invasion is photographed to record.
In the step 2), set drying temperature is 110 when drying to full diameter tight sand core sample
DEG C, drying time is 48 hours.
The invention adopts the above technical scheme, which has the following advantages: 1, the present invention on ground by will really bore
Pressurized tank is added in well mud, and added with the colored ink for distinguishing between colors in mud, pressurized tank is added in nitrogen using pressure pump
In so that the pressure in pressurized tank is maintained preset pressure, then maintaining pressure in pressurized tank, therefore the present invention can for a period of time
With the process of mud filtrate intrusion rock core during accurate simulation drilling and coring delivery, and mud is observed with can be convenient by color
Filtrate invades the depth of rock core, special hypotonic with fine and close sand to be measured in subsequent boring sample not by rock core that mud filtrate infects
The original water saturation of rock gas-bearing formation is prepared.2, the present invention is using tight sand core sample of sealing with wax instead of sealing core drilling densification sand
Rock core sample greatly reduces the cost of hypotonic and Methed of Tight Sandstone Gas Layers water saturation measurement.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of experimental provision of the present invention；
Fig. 2 is the graph of relation of mud filtrate depth of invasion and full-hole core porosity that present invention experiment measures.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
A kind of tight sand provided by the invention is sealed with wax the acquisition methods of rock core water containing saturability, comprising the following steps:
1) as shown in Figure 1, High Purity Nitrogen gas cylinder 1, hand-operating pressure pump 2, pressure valve 3, pressure gauge 4 and pressurized tank 5 are sequentially connected
It picks up and.
2) the full diameter tight sand core sample that will seal with wax obtains full diameter tight sand core sample 6 after removing wax, uses
Drying equipment dries full diameter tight sand core sample 6 48 hours at 110 DEG C, weighs sample dry weight after cooling, utilizes
Helium method measures core porosity and permeability.
3) full diameter tight sand core sample 6 is fixed on 5 bottom of pressurized tank.
4) by added with the experiment of color ink is distinguished in drilling mud injection pressure tank 5, the liquid level of drilling mud is covered entirely
The top of diameter tight sand core sample 6, confining pressure tank 5.
5) add nitrogen in pressurized tank 5 using hand-operating pressure pump 2, after reaching design value formation pressure stop that nitrogen is added,
And pressure valve 3 is closed, allow pressurized tank 5 that its internal pressure is made to be in design strata pressure in the given time under static condition
Value.
6) 3 pressure release of pressure valve is opened, takes out after full diameter tight sand core sample 6 cleans out surface mud, weighs
Sample weight in wet base.
7) full diameter tight sand core sample 6 is dried and is splitted, red ink depth of invasion is observed and measure, by red ink
Water depth of invasion is denoted as drilling mud filtrate depth of invasion.
8) 2)~7 the full diameter tight sand core sample 6 of sealing with wax for replacing Different porosities, repeats the above steps), it obtains
The relation curve (as shown in Figure 2) of mud filtrate depth of invasion and full-hole core porosity.
9) relation curve of mud filtrate depth of invasion and full-hole core porosity according to obtained in step 8), to bore
The plunger rock sample not invaded by mud filtrate is taken, carries out water saturation measurement, the water saturation measured using the prior art
Measured value is considered the true water saturation of Methed of Tight Sandstone Gas Layers.
In above-described embodiment, in step 1), pressurized tank 5 is cylindrical full-hole core clamper, which can hold
By the pressure of about 20MPa, the pressure gauge 4 for monitoring 5 internal pressure of pressurized tank is provided on pressurized tank 5.Electronic balance
Precision is not less than 0.01g.
In above-described embodiment, in step 4), the color of ink is red, and the injection rate of experiment drilling mud can just
It is best for flooding full diameter tight sand core sample 6.Further, experiment red ink in drilling mud and drilling mud
Ratio is 1:20.
In above-described embodiment, in step 5), the predetermined time is two hours, and design value formation pressure is 14MPa.
In above-described embodiment, in step 7), red ink depth of invasion is photographed to record.
The present invention is only illustrated with above-described embodiment, and structure, setting position and its connection of each component are all can have
Changed, based on the technical solution of the present invention, improvement that all principles according to the present invention carry out individual part and equivalent
Transformation, should not exclude except protection scope of the present invention.
Claims (7)
- The acquisition methods of rock core water containing saturability 1. a kind of tight sand is sealed with wax, comprising the following steps:1) High Purity Nitrogen gas cylinder, hand-operating pressure pump, pressure valve, pressure gauge and pressurized tank are sequentially connected with；2) the full diameter tight sand core sample that will seal with wax obtains full diameter tight sand core sample after removing wax, is set using drying It is standby that full diameter tight sand core sample is dried, sample dry weight is weighed after cooling, measures rock core hole using helium method Degree and permeability；3) full diameter tight sand core sample is fixed on pressure pot bottom；4) by added with the experiment of color ink is distinguished in drilling mud injection pressure tank, the liquid level of drilling mud covers full diameter and causes The top of close Sandstone Cores sample, confining pressure tank；5) add nitrogen in pressurized tank using hand-operating pressure pump, after reaching design value formation pressure stop that nitrogen is added, and close Pressure valve allows pressurized tank that its internal pressure is made to be in design value formation pressure in the given time under static condition；6) pressure valve pressure release is opened, takes out after full diameter tight sand core sample cleans out surface mud, it is wet to weigh sample Weight；7) full diameter tight sand core sample is dried and is splitted, observed and measure red ink depth of invasion, red ink is invaded Enter depth and is denoted as drilling mud filtrate depth of invasion；8) 2)~7 the full diameter tight sand core sample of sealing with wax for replacing Different porosities, repeats the above steps), obtain mud The graph of relation of filtrate depth of invasion and full-hole core porosity；9) relation curve of mud filtrate depth of invasion and full-hole core porosity according to obtained in step 8), to drill through not The plunger rock sample invaded by mud filtrate, carries out water saturation measurement, and the water saturation measured value measured is considered fine and close The true water saturation of sandstone reservoir.
- The acquisition methods of rock core water containing saturability 2. a kind of tight sand as described in claim 1 is sealed with wax, it is characterised in that: institute It states in step 1), pressurized tank is cylindrical full-hole core clamper, is provided on pressurized tank for monitoring pressure inside pressurized tank The pressure gauge of power.
- The acquisition methods of rock core water containing saturability 3. a kind of tight sand as described in claim 1 is sealed with wax, it is characterised in that: institute It states in step 4), the color of ink is red, and the injection rate of experiment drilling mud can just flood full diameter tight sand Core sample is best.
- The acquisition methods of rock core water containing saturability 4. a kind of tight sand as described in claim 1 is sealed with wax, it is characterised in that: institute It is 1:20 that experiment, which is stated in step 4), with the ratio of red ink in drilling mud and drilling mud.
- The acquisition methods of rock core water containing saturability 5. a kind of tight sand as described in claim 1 is sealed with wax, it is characterised in that: institute It states in step 5), the predetermined time is two hours, and design value formation pressure is 14MPa.
- The acquisition methods of rock core water containing saturability 6. a kind of tight sand as claimed in claim 3 is sealed with wax, it is characterised in that: institute It states in step 7), photographs to record red ink depth of invasion.
- The acquisition methods of rock core water containing saturability 7. a kind of tight sand as described in claim 1 is sealed with wax, it is characterised in that: institute It states in step 2), set drying temperature is 110 DEG C when drying to full diameter tight sand core sample, drying time It is 48 hours.
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| CN111751242B (en) * | 2020-06-19 | 2023-02-24 | 中国石油天然气股份有限公司 | Method for accurately measuring petroleum water saturation of shale oil and gas reservoir rock |
| CN111852465B (en) * | 2020-08-27 | 2023-06-20 | 中国石油大学(华东) | Evaluation method for obtaining shale reservoir rock core original water content by water-based mud drilling |
| CN117074231B (en) * | 2023-07-17 | 2024-02-13 | 山东国材益新建筑科技有限公司 | Rapid detection method for solid content of wastewater slurry in green building construction |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Applicant after: China Offshore Oil Group Co., Ltd. Applicant after: CNOOC research institute limited liability company Address before: 100027 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Applicant before: China National Offshore Oil Corporation Applicant before: CNOOC Research Institute |
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