CN107503717A - A kind of evaluation method of gravel filling sand prevention reservoir protection effect - Google Patents
A kind of evaluation method of gravel filling sand prevention reservoir protection effect Download PDFInfo
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- CN107503717A CN107503717A CN201710827437.6A CN201710827437A CN107503717A CN 107503717 A CN107503717 A CN 107503717A CN 201710827437 A CN201710827437 A CN 201710827437A CN 107503717 A CN107503717 A CN 107503717A
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- Prior art keywords
- gravel
- rock core
- protection effect
- pack
- reservoir protection
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Classifications
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- 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
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/005—Testing the nature of borehole walls or the formation by using drilling mud or cutting data
Abstract
The invention provides a kind of evaluation method of gravel filling sand prevention reservoir protection effect, belong to sea oil drilling and production technical field, be mainly used in the evaluation of reservoir protection effect in Oil/gas Well gravel filling sand prevention operation process.The present invention improves existing core permeability recovery value evaluating apparatus, gravel filling sand prevention reservoir protection effect has been carried out to evaluate and establish evaluation criterion by the way that rock core, gravel packing zone and screen casing are effectively combined.Using stratum, drilling fluid filter cake, gravel packing zone and screen casing after assessment gravel packing operations that can be authentic and valid of the invention to the combined influence degree of reservoir protection effect, easy to operate, as a result accurately, repeatability is high.
Description
Technical field
The present invention relates to sea oil drilling and production technical field, particularly as being a kind of evaluation Oil/gas Well gravel filling sand prevention operation
During reservoir protection effect method.
Background technology
Completion is that the measure of effective passage is formed between payzone and pit shaft.It is that oil-gas reservoir is effective for low permeability reservoir horizontal well
The Main Patterns of exploitation, horizontal well completion technology directly affect Oil ＆ Gas Productivity and later stage input measure, and for loose cementation
Or the serious reservoir that shakes out, gravel pack completion method should be typically used, to meet the needs of production wellbore stability and sand control.
Gravel filling sand prevention completion technique is the important component in oil gas well mining technology, and it is first by screen insertion
OIH gas-bearing formation position, the gravel chosen in advance on the ground is then pumped to screen casing and well or screen casing and set with packing fluid
In annular space between pipe, a gravel packing zone is formed, to stop that reservoir sand flows into pit shaft, reaches the protection borehole wall, sand control
Enter the purpose of well, there is the advantages that sand controlling result is good, and working life is long.
When conventional reservoir protecting effect evaluation experimental is simulated, the rock core after drilling fluid contamination is directly subjected to resume permeability
Value measure, reservoir pollution situation is determined with the height of recovery value.During gravel filling sand prevention job execution, pack gravel mesh number
It need to be matched and calculated according to stratum fineness of sand situation with screen casing sand block precision, be applied to not so as to form various combination mode
With stratum sand control, after gravel filling in Oil/gas Well production process, reservoir fluid need to fill by stratum, drilling fluid filter cake, gravel
In layer and screen casing access wall, therefore the evaluation of gravel filling sand prevention reservoir protection is different from conventional reservoir protection evaluation.Existing routine
Evaluation method can not carry out gravel packing zone and screen casing resume permeability situation experimental simulation, it is impossible to evaluate gravel packing zone and sieve
Pipe influences to caused by Oil ＆ Gas Productivity, it is impossible to true stratum, drilling fluid filter cake, gravel packing zone after assessing gravel packing operations
And screen casing is to the combined influence degree of reservoir protection effect.In view of limitation existing for conventional reservoir protecting effect evaluation method,
Urgent need establishes gravel filling sand prevention reservoir protection effect evaluation method.
The content of the invention
Reservoir protection effect in Oil/gas Well gravel filling sand prevention operation process is evaluated it is an object of the invention to provide a kind of
Evaluation method, stratum, drilling fluid filter cake, gravel packing zone and sieve after authentic and valid assessment gravel filling sand prevention operation can be established
Pipe improves Oil/gas Well reservoir protection effect evaluation method system, instructed existing to the method for reservoir protection effect combined influence degree
Field operation.
To realize the purpose of foregoing invention, the technical solution adopted by the present invention is as follows：
A kind of evaluation method of gravel filling sand prevention reservoir protection effect, comprises the following steps：
A body measurement permeability is formed to gravel packing zone and the wire screen of corresponding sand block precision after rock core preparation, is damaged by drilling fluid
After the dynamic simulation evaluation experiment of evil oil reservoir, gravel pack fluid mud cake scouring experiment is carried out, by the rock with filter cake after rock core taking-up
The wire screen composition one of the heart, gravel packing zone and corresponding sand block precision, determines oozing for rock core, filter cake, gravel packing zone and wire screen
Saturating rate recovery value evaluates gravel filling sand prevention reservoir protection effect.Specific method is as follows：
After rock core preparation a body measurement permeability, its key step are formed to gravel packing zone and the wire screen of corresponding sand block precision
For：
（1）Rock core cleaning, drying；
（2）The accurate pack gravel 50g for weighing scene actual use, pack gravel is loaded special steel bushing（External diameter
2.45cm, internal diameter 2.25cm）, compacting；
（3）Clip external diameter is 2.45cm, the circular wire screen of sand block precision identical with actual use screen casing, is assemblied in steel bushing one
End, encapsulate pack gravel；
（4）Rock core is connected into compacting with special steel bushing to be integrated, forms rock core, pack gravel layer, wire screen from left to right suitable
Sequence arranges, overall to load core holding unit, measure air permeability K0.Experimental equipment is shown in accompanying drawing 1.
After the experiment of drilling fluid damage oil reservoir dynamic simulation evaluation, gravel pack fluid mud cake scouring experiment is carried out, it is led
The step is wanted to be：
（1）Using rock core dynamic filtration experimental facilities and the drilling fluid of scene actual use, rock core and special steel bushing are separated, it is right
Rock core carries out drilling fluid damage oil reservoir dynamic simulation experiment；
（2）Prepare the gravel pack fluid of scene actual use；
（3）The drilling fluid replaced in rock core dynamic filtration experimental facilities is gravel pack fluid；
（4）Experimental temperature is set according to actual reservoir temperature, experiment pressure difference is set according to strata pressure situation, according to actual gravel
Filling velocity setting experiment rotor speed, gravel pack fluid leakoff rate and wastage after determination experiment 4-6h, after the completion of take out
Rock core is complete to retain rock core end mud cake.
Rock core forms the wire screen of the rock core with filter cake, gravel packing zone and corresponding sand block precision integrally after taking out, and surveys
The permeability resume figure of rock core, filter cake, gravel packing zone and wire screen is determined to evaluate gravel filling sand prevention reservoir protection effect, and it is led
The step is wanted to be：
（1）Pack gravel 50g after the accurate gravel pack fluid immersion weighed by scene actual use；
（2）Pack gravel is loaded to special steel bushing, is compacted；
（3）Clip external diameter is 2.45cm, the circular wire screen of sand block precision identical with actual use screen casing, is assemblied in special steel bushing
One end, encapsulate pack gravel；
（4）Rock core is had to one end of filter cake, compacting composition one is connected with steel bushing, forms rock core, filter cake, pack gravel
The order arrangement of layer, wire screen from left to right, it is overall to load core holding unit, measure air permeability K1.Experimental equipment is shown in attached
Fig. 2.
Imitated using the permeability resume figure of rock core, filter cake, gravel packing zone and wire screen as gravel filling sand prevention reservoir protection
Fruit evaluation index, recovery value Dh=K1/K0*100%。
The beneficial effects of the invention are as follows：
A kind of method for evaluating reservoir protection effect in Oil/gas Well gravel filling sand prevention operation process is provided, this method can truly have
Stratum, drilling fluid filter cake, gravel packing zone and screen casing are to the comprehensive of reservoir protection effect after the assessment gravel filling sand prevention operation of effect
Influence degree is closed, easy to operate, as a result accurately, repeatability is high.
Brief description of the drawings：
Fig. 1 is measure K0Experimental provision；
Fig. 2 is measure K1Experimental provision.
Wherein：1st, core holding unit, 2, rock core, 3, special steel bushing, 4, pack gravel, 5, wire screen, 6, filter cake.
Embodiment
Below by specific embodiment, the present invention is further detailed explanation, and these examples are only used for illustrating this hair
It is bright, it does not limit the scope of the invention.
Embodiment
The accurate pack gravel 50g for weighing scene actual use, pack gravel is loaded special steel bushing（External diameter
2.45cm, internal diameter 2.25cm）, compacting, and clip external diameter is 2.45cm, the circular screen of sand block precision identical with actual use screen casing
Cloth, steel bushing one end is assemblied in, encapsulates pack gravel；After rock core cleaning, drying, it is one that rock core is connected into compacting with steel bushing
Body, the order arrangement of rock core, pack gravel layer, wire screen from left to right is formed, it is overall to load core holding unit, determine air penetration
Rate K0.Removal of core, using rock core dynamic filtration experimental facilities and the drilling fluid of scene actual use, drilling fluid damage is carried out to rock core
Evil oil reservoir dynamic simulation experiment；And the gravel pack fluid of scene actual use is prepared, replace in rock core dynamic filtration experimental facilities
Drilling fluid is gravel pack fluid, and experimental temperature is set according to actual reservoir temperature, and experiment pressure difference is set according to strata pressure situation,
Set according to actual gravel filling velocity and test rotor speed, gravel pack fluid leakoff rate and leakage after determination experiment 4-6h
Amount, after the completion of removal of core, it is complete to retain rock core end mud cake；Then the gravel pack fluid by scene actual use is accurately weighed
Pack gravel 50g after immersion, pack gravel is loaded to special steel bushing, be compacted, and clip external diameter is 2.45cm, with reality
Using the circular wire screen of the identical sand block precision of screen casing, special steel bushing one end is assemblied in, encapsulates pack gravel；Rock core had into filter
One end of cake, compacting composition one is connected with steel bushing, forms rock core, filter cake, pack gravel layer, the order of wire screen from left to right
Arrangement, it is overall to load core holding unit, measure air permeability K1.With the permeability of rock core, filter cake, gravel packing zone and wire screen
Recovery value is as gravel filling sand prevention reservoir protection Indexes of Evaluation Effect, recovery value Dh=K1/K0*100%。
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, it is clear that those skilled in the art
Member can carry out various changes and modification without departing from the spirit and scope of the present invention to the present invention.So, if the present invention
These modifications and variations belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to include these
Including change and modification.
Claims (5)
1. a kind of evaluation method of gravel filling sand prevention reservoir protection effect, it is mainly characterized by：Rock core fills after preparing with gravel
Packing course and the wire screen of corresponding sand block precision form a body measurement permeability, are tested by drilling fluid damage oil reservoir dynamic simulation evaluation
Afterwards, gravel pack fluid mud cake scouring experiment is carried out, by the rock core with filter cake, gravel packing zone and corresponding sand block after rock core taking-up
The wire screen composition one of precision, the permeability resume figure for determining rock core, filter cake, gravel packing zone and wire screen fill to evaluate gravel
Sand control reservoir protection effect.
A kind of 2. evaluation method of gravel filling sand prevention reservoir protection effect according to claim 1, it is characterised in that rock
A body measurement permeability is formed to gravel packing zone and the wire screen of corresponding sand block precision after heart preparation, it is mainly comprised the following steps：
（1）Rock core cleaning, drying；
（2）The accurate pack gravel 50g for weighing scene actual use, pack gravel is loaded special steel bushing, external diameter
2.45cm, internal diameter 2.25cm, compacting；
（3）Clip external diameter is 2.45cm, the circular wire screen of sand block precision identical with actual use screen casing, is assemblied in steel bushing one
End, encapsulate pack gravel；
（4）Rock core is connected into compacting with special steel bushing to be integrated, forms rock core, pack gravel layer, wire screen from left to right suitable
Sequence arranges, overall to load core holding unit, measure air permeability K0。
A kind of 3. evaluation method of gravel filling sand prevention reservoir protection effect according to claim 1, it is characterised in that warp
After crossing the experiment of drilling fluid damage oil reservoir dynamic simulation evaluation, gravel pack fluid mud cake scouring experiment is carried out, it is mainly comprised the following steps：
（1）Using rock core dynamic filtration experimental facilities and the drilling fluid of scene actual use, rock core and special steel bushing are separated, it is right
Rock core carries out drilling fluid damage oil reservoir dynamic simulation experiment；
（2）Prepare the gravel pack fluid of scene actual use；
（3）The drilling fluid replaced in rock core dynamic filtration experimental facilities is gravel pack fluid；
（4）Experimental temperature is set according to actual reservoir temperature, experiment pressure difference is set according to strata pressure situation, according to actual gravel
Filling velocity setting experiment rotor speed, gravel pack fluid leakoff rate and wastage after determination experiment 4-6h, after the completion of take out
Rock core is complete to retain rock core end mud cake.
A kind of 4. evaluation method of gravel filling sand prevention reservoir protection effect according to claim 1, it is characterised in that rock
The heart forms the wire screen of the rock core with filter cake, gravel packing zone and corresponding sand block precision integrally after taking out, measure rock core, filter
The permeability resume figure of cake, gravel packing zone and wire screen evaluates gravel filling sand prevention reservoir protection effect, and it is mainly comprised the following steps：
（1）Pack gravel 50g after the accurate gravel pack fluid immersion weighed by scene actual use；
（2）Pack gravel is loaded to special steel bushing, is compacted；
（3）Clip external diameter is 2.45cm, the circular wire screen of sand block precision identical with actual use screen casing, is assemblied in special steel bushing
One end, encapsulate pack gravel；
（4）Rock core is had to one end of filter cake, compacting composition one is connected with steel bushing, forms rock core, filter cake, pack gravel
The order arrangement of layer, wire screen from left to right, it is overall to load core holding unit, measure air permeability K1。
5. a kind of evaluation method of gravel filling sand prevention reservoir protection effect according to claim 4, it is characterised in that with rock
The evaluation index of the heart, filter cake, the permeability resume figure of gravel packing zone and wire screen as gravel filling sand prevention reservoir protection effect,
Recovery value
Dh=K1/K0*100%
If Dh＞ 80, reservoir protection effect are excellent；If 50 ＜ Dh≤ 80, reservoir protection effect is good；Dh≤ 50, reservoir is protected
It is poor to protect effect.
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| CN201710827437.6A CN107503717B (en) | 2017-09-14 | 2017-09-14 | A kind of evaluation method of gravel filling sand prevention reservoir protection effect |
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| CN201710827437.6A CN107503717B (en) | 2017-09-14 | 2017-09-14 | A kind of evaluation method of gravel filling sand prevention reservoir protection effect |
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| CN107503717A true CN107503717A (en) | 2017-12-22 |
| CN107503717B CN107503717B (en) | 2019-07-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984917A (en) * | 2019-11-15 | 2020-04-10 | 中国海洋石油集团有限公司 | Production-increasing water-controlling sand-preventing well completion method for low-permeability reservoir |
| CN112766622A (en) * | 2019-10-21 | 2021-05-07 | 中国石油化工股份有限公司 | Method for evaluating damage of reservoir of newly-produced gas well |
| CN113324886A (en) * | 2021-04-20 | 2021-08-31 | 中海油能源发展股份有限公司 | Experimental evaluation device and method for damage of cement paste to reservoir |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112766622A (en) * | 2019-10-21 | 2021-05-07 | 中国石油化工股份有限公司 | Method for evaluating damage of reservoir of newly-produced gas well |
| CN112766622B (en) * | 2019-10-21 | 2024-04-05 | 中国石油化工股份有限公司 | New production gas well reservoir damage evaluation method |
| CN110984917A (en) * | 2019-11-15 | 2020-04-10 | 中国海洋石油集团有限公司 | Production-increasing water-controlling sand-preventing well completion method for low-permeability reservoir |
| CN113324886A (en) * | 2021-04-20 | 2021-08-31 | 中海油能源发展股份有限公司 | Experimental evaluation device and method for damage of cement paste to reservoir |
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| CN107503717B (en) | 2019-07-19 |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Applicant after: China Offshore Oil Group Co., Ltd. Applicant after: CNOOC (China) Limited Zhanjiang Branch Address before: 100010 China oil tower, 25 Chaoyangmen North Street, Dongcheng District, Beijing Applicant before: China National Offshore Oil Corporation Applicant before: CNOOC (China) Limited Zhanjiang Branch |
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