CN107503717B - 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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- CN107503717B CN107503717B CN201710827437.6A CN201710827437A CN107503717B CN 107503717 B CN107503717 B CN 107503717B CN 201710827437 A CN201710827437 A CN 201710827437A CN 107503717 B CN107503717 B CN 107503717B
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- gravel
- rock core
- protection effect
- pack
- filter cake
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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 present invention provides a kind of evaluation methods of gravel filling sand prevention reservoir protection effect, belong to sea oil drilling and production technical field, are mainly used for 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, evaluate to gravel filling sand prevention reservoir protection effect and established evaluation criterion by effectively combining rock core, gravel packing zone and screen casing.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
The method of reservoir protection effect in the process.
Background technique
Complete well is the measure that effective channel 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 period investment measure, and for loose cementation
Or the serious reservoir that shakes out, gravel pack completion method should be generally 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, it is first by screen insertion
Then the gravel chosen in advance on the ground is pumped to screen casing and wellbore or screen casing and set with packing fluid by well oil gas-bearing formation position
In annular space between pipe, a gravel packing zone is constituted, to stop reservoir sand to flow into pit shaft, reaches the protection borehole wall, sand control
The purpose for entering well has many advantages, such as 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 measurement, determines reservoir pollution situation with the height of recovery value.During gravel filling sand prevention job execution, pack gravel mesh number
It need to be matched and be calculated according to stratum fineness of sand situation with screen casing sand block precision, be applied to not to form various combination mode
With stratum sand control, after gravel filling in oil/gas well production process, reservoir fluid need to be filled by stratum, drilling fluid filter cake, gravel
Layer and screen casing flow into well, therefore the evaluation of gravel filling sand prevention reservoir protection is different from conventional reservoir protection evaluation.Existing routine
Evaluation method not can be carried out gravel packing zone and the experiment simulation of screen casing resume permeability situation, cannot evaluate gravel packing zone and sieve
Pipe is influenced caused by Oil & Gas Productivity, cannot really assess stratum, drilling fluid filter cake, gravel packing zone after 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.
Summary of the invention
The object of the present invention is to provide reservoir protection effects in a kind of evaluation oil/gas well gravel filling sand prevention operation process
Evaluation method can establish stratum, drilling fluid filter cake, gravel packing zone and sieve after authentic and valid assessment gravel filling sand prevention operation
Pipe improves oil/gas well reservoir protection effect evaluation method system to the method for reservoir protection effect combined influence degree, and guidance is existing
Field operation.
For realize foregoing invention purpose, The technical solution adopted by the invention is as follows:
A kind of evaluation method of gravel filling sand prevention reservoir protection effect, comprising the following steps:
Permeability is integrally measured to the wire screen group of gravel packing zone and corresponding sand block precision after rock core preparation, by drilling well
After the experiment of liquid damage oil reservoir dynamic simulation evaluation, gravel pack fluid filter cake scouring experiment is carried out, rock core will have filter cake after taking out
Rock core, the wire screen group of gravel packing zone and corresponding sand block precision it is integral, measurement rock core, filter cake, gravel packing zone and wire screen
Permeability resume figure evaluate gravel filling sand prevention reservoir protection effect.The specific method is as follows:
Permeability is integrally measured to the wire screen group of gravel packing zone and corresponding sand block precision after rock core preparation, is mainly walked
Suddenly are as follows:
(1) rock core cleaning, drying；
(2) pack gravel, is packed into special steel bushing (outer diameter by the pack gravel 50g for accurately weighing scene actual use
2.45cm, internal diameter 2.25cm), compacting；
(3) clip outer diameter is 2.45cm, and the round wire screen of sand block precision identical as actual use screen casing is assemblied in steel bushing
One end encapsulates pack gravel；
(4) rock core is connect to compacting to be integrated with special steel bushing, forms rock core, pack gravel layer, wire screen from left to right
Sequence arrangement, it is whole to be packed into core holding unit, measure air permeability K0.Experimental equipment is shown in attached drawing 1.
After the experiment of drilling fluid damage oil reservoir dynamic simulation evaluation, gravel pack fluid filter cake scouring experiment, master are carried out
Want step are as follows:
(1) using the drilling fluid of rock core dynamic filtration experimental facilities and scene actual use, by rock core and special steel bushing point
It opens, drilling fluid damage oil reservoir dynamic simulation experiment is carried out to rock core；
(2) gravel pack fluid of scene actual use is prepared；
(3) replacing the drilling fluid 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 reality
Gravel filling velocity, which is set, tests rotor speed, gravel pack fluid leakoff rate and wastage after measurement experiment 4-6h, after the completion
Removal of core is complete to retain rock core end filter cake.
Rock core is integral by the wire screen group with the rock core of filter cake, gravel packing zone and corresponding sand block precision 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, is led
Want step are as follows:
(1) the pack gravel 50g after the gravel pack fluid of scene actual use impregnates is accurately weighed；
(2) pack gravel is packed into special steel bushing, is compacted；
(3) clip outer diameter is 2.45cm, and the round wire screen of sand block precision identical as actual use screen casing is assemblied in special steel
Sleeve one end encapsulates pack gravel；
(4) rock core is had to one end of filter cake, it is integral connect compacting group with steel bushing, forms rock core, filter cake, fills gravel
The sequence arrangement of rock layers, wire screen from left to right, it is whole to be packed into core holding unit, measure air permeability K1.Experimental equipment is shown in
Attached drawing 2.
It is 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 present invention are:
A kind of method for evaluating reservoir protection effect in oil/gas well gravel filling sand prevention operation process is provided, this method can be true
Stratum, drilling fluid filter cake, gravel packing zone and screen casing are to reservoir protection effect after real effective assessment gravel filling sand prevention operation
Combined influence degree, easy to operate, as a result accurately, repeatability is high.
Detailed description of the invention:
Fig. 1 is measurement K0Experimental provision；
Fig. 2 is measurement K1Experimental provision.
Wherein: 1, core holding unit, 2, rock core, 3, special steel bushing, 4, pack gravel, 5, wire screen, 6, filter cake.
Specific embodiment
Below by specific embodiment, the present invention is described in further detail, these examples are only used to illustrate this hair
It is bright, it does not limit the scope of the invention.
Embodiment
Pack gravel, is packed into special steel bushing (outer diameter by the pack gravel 50g for accurately weighing scene actual use
2.45cm, internal diameter 2.25cm), compacting, and clip outer diameter is the circular screen of 2.45cm, sand block precision identical as actual use screen casing
Cloth is assemblied in steel bushing one end, encapsulates pack gravel；After rock core cleaning, drying, it is one that rock core, which is connect compacting with steel bushing,
Body forms the sequence arrangement of rock core, pack gravel layer, wire screen from left to right, whole to be packed into core holding unit, measures air penetration
Rate K0.Removal of core carries out drilling fluid damage to rock core using the drilling fluid of rock core dynamic filtration experimental facilities and scene actual use
Evil oil reservoir dynamic simulation experiment；And the gravel pack fluid of scene actual use is prepared, it replaces in rock core dynamic filtration experimental facilities
Drilling fluid is gravel pack fluid, sets experimental temperature according to actual reservoir temperature, sets experiment pressure difference according to strata pressure situation,
Experiment rotor speed, gravel pack fluid leakoff rate and leakage after measurement experiment 4-6h are set according to practical gravel filling velocity
Amount, removal of core, complete to retain rock core end filter cake after the completion；Then the gravel pack fluid by scene actual use is accurately weighed
Pack gravel is packed into special steel bushing by the pack gravel 50g after immersion, compacting, and clip outer diameter is 2.45cm, with reality
Using the round wire screen of the identical sand block precision of screen casing, it is assemblied in special steel bushing one end, encapsulates pack gravel；Rock core had into filter
One end of cake, connect that compacting group is integral with steel bushing, forms rock core, filter cake, pack gravel layer, the sequence of wire screen from left to right
Arrangement, it is whole to be packed into 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 above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, it is clear that those skilled in the art
Various changes and modifications can be made to the invention by member without departing from the spirit and scope of the present invention.If in this way, of the invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to encompass these to these modifications and variations
Including modification and variation.
Claims (4)
1. a kind of evaluation method of gravel filling sand prevention reservoir protection effect is mainly characterized by comprising: to fill after rock core prepares with gravel
The wire screen group of packing course and corresponding sand block precision integrally measures permeability, tests by drilling fluid damage oil reservoir dynamic simulation evaluation
Afterwards, gravel pack fluid filter cake scouring experiment is carried out, rock core will have rock core, gravel packing zone and the corresponding sand block of filter cake after taking out
The wire screen group of precision is integral, measures the permeability resume figure of rock core, filter cake, gravel packing zone and wire screen to evaluate gravel filling
Sand control reservoir protection effect；
Permeability, key step are integrally measured to the wire screen group of gravel packing zone and corresponding sand block precision after rock core preparation
Are as follows:
(1) rock core cleaning, drying；
(2) pack gravel, is packed into special steel bushing, outer diameter by the pack gravel 50g for accurately weighing scene actual use
2.45cm, internal diameter 2.25cm, compacting；
(3) clip outer diameter is 2.45cm, and the round wire screen of sand block precision identical as actual use screen casing is assemblied in steel bushing one
End encapsulates pack gravel；
(4) rock core is connect with special steel bushing to compacting to be integrated, forms rock core, pack gravel layer, wire screen from left to right suitable
Sequence arrangement, it is whole to be packed into core holding unit, measure air permeability K0。
2. a kind of evaluation method of gravel filling sand prevention reservoir protection effect according to claim 1, which is characterized in that warp
After crossing the experiment of drilling fluid damage oil reservoir dynamic simulation evaluation, gravel pack fluid filter cake scouring experiment, key step are carried out are as follows:
(1) using the drilling fluid of rock core dynamic filtration experimental facilities and 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) gravel pack fluid of scene actual use is prepared；
(3) replacing the drilling fluid 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 practical gravel
Rotor speed is tested in filling velocity setting, and gravel pack fluid leakoff rate and wastage after measurement experiment 4-6h are taken out after the completion
Rock core is complete to retain rock core end filter cake.
3. a kind of evaluation method of gravel filling sand prevention reservoir protection effect according to claim 1, which is characterized in that rock
The heart is integral by the wire screen group with the rock core of filter cake, gravel packing zone and corresponding sand block precision after taking out, measurement rock core, filter
The permeability resume figure of cake, gravel packing zone and wire screen evaluates gravel filling sand prevention reservoir protection effect, key step are as follows:
(1) the pack gravel 50g after the gravel pack fluid of scene actual use impregnates is accurately weighed；
(2) pack gravel is packed into special steel bushing, is compacted；
(3) clip outer diameter is 2.45cm, and the round wire screen of sand block precision identical as actual use screen casing is assemblied in special steel bushing
One end encapsulates pack gravel；
(4) rock core is had to one end of filter cake, it is integral connect compacting group with steel bushing, formation rock core, filter cake, pack gravel
The sequence arrangement of layer, wire screen from left to right, it is whole to be packed into core holding unit, measure air permeability K1。
4. a kind of evaluation method of gravel filling sand prevention reservoir protection effect according to claim 3, which is characterized in that with rock
Evaluation index of the permeability resume figure as gravel filling sand prevention reservoir protection effect of the heart, filter cake, gravel packing zone and wire screen,
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%, storage
Layer protecting effect is poor.
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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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| Publication Number | Publication Date |
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| CN107503717A CN107503717A (en) | 2017-12-22 |
| CN107503717B true CN107503717B (en) | 2019-07-19 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113324886B (en) * | 2021-04-20 | 2022-06-03 | 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 |
Citations (5)
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| DE3531547A1 (en) * | 1985-09-04 | 1987-03-05 | Ortlam Soester Ferun | Method for extracting water from ground water-bearing strata, and design of a well for implementing this method |
| CN101251000A (en) * | 2008-02-03 | 2008-08-27 | 中国海洋石油总公司 | Gravel packing sand-prevention experimental device within pipe for simulating down-hole actual behavior |
| CN102320857A (en) * | 2011-08-31 | 2012-01-18 | 新疆华油技术服务股份有限公司 | Preparation method of artificial sand for sand prevention of oil-producing well and application thereof |
| CN102913205A (en) * | 2012-11-01 | 2013-02-06 | 中国海洋石油总公司 | Method for building uncased-hole gravel-filled artificial migration passage between gas reservoirs |
| CN106761590A (en) * | 2015-11-24 | 2017-05-31 | 中国石油化工股份有限公司 | Many slug high compact filling anti-sand processes |
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2017
- 2017-09-14 CN CN201710827437.6A patent/CN107503717B/en active Active
Patent Citations (5)
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| DE3531547A1 (en) * | 1985-09-04 | 1987-03-05 | Ortlam Soester Ferun | Method for extracting water from ground water-bearing strata, and design of a well for implementing this method |
| CN101251000A (en) * | 2008-02-03 | 2008-08-27 | 中国海洋石油总公司 | Gravel packing sand-prevention experimental device within pipe for simulating down-hole actual behavior |
| CN102320857A (en) * | 2011-08-31 | 2012-01-18 | 新疆华油技术服务股份有限公司 | Preparation method of artificial sand for sand prevention of oil-producing well and application thereof |
| CN102913205A (en) * | 2012-11-01 | 2013-02-06 | 中国海洋石油总公司 | Method for building uncased-hole gravel-filled artificial migration passage between gas reservoirs |
| CN106761590A (en) * | 2015-11-24 | 2017-05-31 | 中国石油化工股份有限公司 | Many slug high compact filling anti-sand processes |
Non-Patent Citations (1)
| Title |
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| "渤海稠油油藏简易防砂条件下";曾祥林等;<中国海上油气>;20041231;第16卷(第6期);第395-400页 |
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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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