CN108457626A - A kind of dissolution type sand bridge screen casing - Google Patents
A kind of dissolution type sand bridge screen casing Download PDFInfo
- Publication number
- CN108457626A CN108457626A CN201711456301.5A CN201711456301A CN108457626A CN 108457626 A CN108457626 A CN 108457626A CN 201711456301 A CN201711456301 A CN 201711456301A CN 108457626 A CN108457626 A CN 108457626A
- Authority
- CN
- China
- Prior art keywords
- dissolution type
- screen casing
- type sand
- supporting arch
- sand bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Abstract
The present invention provides a kind of dissolution type sand bridge screen casings.The dissolution type sand bridge screen casing has screen body；The outer surface of screen body is enclosed with soluble coating, has annular space between soluble coating and screen body；The supporting arch of protrusion is provided at the filter seam of screen body, the basal diameter of supporting arch is identical as the length of filter seam.The dissolution type sand bridge screen casing of the present invention can effectively reduce screen casing and block, promote oil and gas production.
Description
Technical field
The present invention relates to a kind of Petroleum screen tube more particularly to a kind of sand bridge screen casings that can be dissolved, and belong to Petroleum screen tube skill
Art field.
Background technology
Sieve tube completion refers to after oil/gas well finishing drilling, in target zone position tripping in screen casing, rest part setting of casing, in screen casing
Above well section manages the outer closed completion method of cementing.
In oil-gas field development operation, sieve tube completion has bright in oil layer protection, oil reservoir utilization rate, recovery percent of reserves etc.
Aobvious advantage.Conventional sand control completion mainly uses wire-wrapped screen or gravel pack completion two ways.
Wherein, wire-wrapped screen swimming cloths are larger, increase tripping in difficulty and are easy to form screen casing blocking, filter seam de-plugging work
Skill is complicated, deficiency in economic performance.Gravel pack completion needs to screen pack gravel diameter, and design gravel carries liquid, when pack gravel
Caused pressure excitement is affected to layer of oil gas production, increases completion period, task difficulty.
Because providing a kind of more effective Petroleum screen tube becomes one of this field urgent problem to be solved.
Invention content
In order to solve the above-mentioned technical problem, screen casing blocking, promotion oil effectively being reduced the purpose of the present invention is to provide a kind of
The dissolution type sand bridge screen casing of gas yield.
In order to solve the above technical problem, the present invention provides a kind of dissolution type sand bridge screen casing, the dissolution type sand bridge screen casings
With screen body；
Wherein, the outer surface of screen body is enclosed with soluble coating, has ring between soluble coating and screen body
It is empty；
The supporting arch of protrusion is provided at the filter seam of screen body, the basal diameter of supporting arch is identical as the length of filter seam.
In above-mentioned dissolution type sand bridge screen casing, it is preferable that the height of projection of supporting arch is not more than soluble coating and screen casing master
Horizontal distance between body；It is highly preferred that the height of projection of supporting arch is equal to the level between soluble coating and screen body
Distance.
Specific implementation mode according to the present invention, it is contemplated that the dissolving difficulty of epoxy resin, to ensure effect after well, no
It is recommended that soluble coating is excessive higher than protrusion.
In above-mentioned dissolution type sand bridge screen casing, it is preferable that the height of projection of supporting arch is determined according to following formula：
e≦2D10
In formula, e is the height of projection of supporting arch；
D10It represents on sand accumulation percentile curve, the sand grains diameter accounted for corresponding to accumulating weight 10% is counted from big grain size
Percentage.
That is, 90% fine sand allows to stitch by filtering, 10% larger-diameter sand grains is blocked in outside, to be formed
The Thief zone " sand bridge " being made of sand grains crane span structure.
In above-mentioned dissolution type sand bridge screen casing, it is preferable that the width for filtering seam is designed according to the grain size analysis of stratum sand sample.
Specific implementation mode according to the present invention, according to the conventional method of this field, according to the grain size analysis of stratum sand sample
The width of design filter seam.
In above-mentioned dissolution type sand bridge screen casing, it is preferable that the width for filtering seam is equal to the height of projection of supporting arch.
In above-mentioned dissolution type sand bridge screen casing, it is preferable that the angle of supporting arch and the filter seam is 3 ° -5 °.
In above-mentioned dissolution type sand bridge screen casing, the angle of supporting arch is designed according to the grain size statistics of reservoir sand, if ground
Layer sand grains diameter is small, and angle is excessive, then cannot form sand arch, or even can block slot.If reservoir sand grain size is big, angle is too small,
The maximum production on stratum cannot then be played；
Preferably, when the grain size of formation particle is 0.25mm-0.1mm, design supporting arch and the angle of filter seam are 3 °；
When the grain size of formation particle is 0.5mm-0.25mm, design supporting arch and the angle of filter seam are 4 °；
When the grain size of formation particle>When 0.5mm, design supporting arch and the angle of filter seam are 5 °.
Above-mentioned design principle can be finely adjusted angle according to the component ratio of reservoir sand.
In above-mentioned dissolution type sand bridge screen casing, it is preferable that be arranged independently of each other between supporting arch and supporting arch.
Specific implementation mode according to the present invention, supporting arch are manufactured using stamping technology.
In above-mentioned dissolution type sand bridge screen casing, it is preferable that soluble coating is epoxy coating.
The above-mentioned dissolution type sand bridge screen casing of the present invention includes the following steps when specifically for completion：
From well head tripping in by above-mentioned dissolution type sand bridge screen casing Novel sieve tube to purpose of horizon, acid epoxy resin dissolving is injected
Liquid, closing well 6h rear-guards replace out lysate, carry out production of hydrocarbons.
The surface of dissolution type sand bridge screen casing of the present invention is coated with soluble coating, show it is smooth, when reducing tripping in screen casing
Frictional resistance；Under the filter of fashionable screen casing sew and shut, influence of the pressure excitement to oil and gas reservoir is small, for restoring screen casing overcurrent after completion
The acid epoxy resin lysate of ability has reservoir certain correctional effect, further promotes yield.
Supporting arch at the filter seam of the dissolution type sand bridge screen casing of the present invention there is support to make the soluble coating on surface
With increasing the integral strength of screen casing；When oil well production, the conveyance capacity of screen casing is better than wire-wrapped screen,
Yield in unit time higher, the sand arch formed by supporting arch encircle more steady than the sand that conventional cutting seam sieve tube is formed
Gu improving sand controlling result；Domes can reduce the flow velocity of formation fluid, reduce the possibility that screen casing blocks, and increase oil gas
The well service life.
The soluble coating of the dissolution type sand bridge screen casing of the present invention reduces frictional resistance when tripping in screen casing, while being separated by pipe
Column inside and annular space, reduce influence of the terrestrial operation to reservoir.After the completion of waiting for screen insertion operation, acid epoxy resin is injected
Lysate dissolves the soluble coating on surface, restores the permeability of screen casing, and the sand control supporting arch of exposing can be such that reservoir sand is stitched in filter
Place forms sand arch, realizes that sand controlling result, acidic dissolution fluid are conducive to improve the permeability on stratum, item is created to improve oil and gas production
Part.
Description of the drawings
Fig. 1 is the dissolution type sand bridge screen construction schematic diagram of embodiment 1.
Fig. 2 is another structural schematic diagram of dissolution type sand bridge screen casing of embodiment 1.
Main Reference symbol description
1 screen body, 2 epoxy coating 3 filter 4 supporting arch of seam, 5 arch springing, 6 screw buckle
Specific implementation mode
In order to which technical characteristic, purpose and the advantageous effect to the present invention are more clearly understood, now to the skill of the present invention
Art scheme carry out it is described further below, but should not be understood as to the present invention can practical range restriction.
Embodiment 1
A kind of dissolution type sand bridge screen casing is present embodiments provided, structure is as depicted in figs. 1 and 2, dissolution type sand bridge sieve
Pipe has screen body 1；
Wherein, the outer surface of screen body is enclosed with epoxy coating 2, between epoxy coating 2 and screen body 1
With annular space；
The supporting arch 4 of protrusion, the length of the basal diameter and filter seam 3 of supporting arch 4 are provided at the filter seam 3 of screen body 1
Identical, the quasi- basins the Ge Er In Northwestern Margin heavy crude reservoir coring in Xinjiang carries out mechanical analysis of rock, obtains less than 0.22-0.25mm's
Sand grains weight percent is 90%, and most samples have sorting always, the analysis sample 10% of random sampling accumulative
Percentage, particle diameter distribution is in 0.22mm-0.25mm；According to slit width cumulative weight 10 is accounted for as grain size analysis no more than stratum sand sample
Twice of criterion of corresponding sand grains diameter, the width that slit width should be slightly smaller than 0.44-0.5mm, therefore design filter seam 3 are 0.45mm；
Annular space distance of the height of projection of supporting arch 4 between epoxy coating 2 and screen body 1, supporting arch 4 it is convex
It rises twice (0.45mm) that height accounts for the correspondence sand grains diameter of cumulative weight 10 no more than stratum sand sample as grain size analysis.
Since reservoir sand grain size is distributed between fine sandstone and medium sandstone, the arch angle 5 of supporting arch 4 and filter seam 3 is 4 °,
Two screen casings are connected by screw buckle 6.
Above-mentioned dissolution type sand bridge screen casing is applied to the quasi- basins the Ge Er In Northwestern Margin heavy crude reservoir in Xinjiang, which mainly contains oil rock
Property be medium-fine sand rock, glutenite and the sandstone of seriate containing gravel (0.19mm-0.27mm), be Sedimentary Model of Braided River Facies deposition, core intersection
5-25m, oil reservoir coefficient 0.57, wetability belong to it is weak-in hydrophilic, oil reservoir effecive porosity 26%-31.7%, horizontal permeability is
0.88-3.0μm2, oil saturation 58%-75% belongs to large capacity High permeability reservoir, and reservoir heterogeneity is serious.
From well head tripping in Novel sieve tube to purpose of horizon, injecting acid epoxy resin lysate, (Dongguan City section, which expands chemical industry, to be had
The second generation epoxy resin dissolving agent that limit company produces), closing well 6h rear-guards replace out lysate, carry out next step operation.
Above example illustrates that dissolution type sand bridge screen casing of the invention can effectively reduce screen casing and block, promote oil gas production
Amount.
Claims (10)
1. a kind of dissolution type sand bridge screen casing, which is characterized in that the dissolution type sand bridge screen casing has screen body；
Wherein, the outer surface of screen body is enclosed with soluble coating, has ring between the solubility coating and screen body
It is empty；
The supporting arch of protrusion, the length of the basal diameter of the supporting arch and the filter seam are provided at the filter seam of the screen body
It spends identical.
2. dissolution type sand bridge screen casing according to claim 1, which is characterized in that the height of projection of the supporting arch is not more than
Horizontal distance between soluble coating and screen body.
3. dissolution type sand bridge screen casing according to claim 1 or 2, which is characterized in that the height of projection etc. of the supporting arch
Horizontal distance between soluble coating and screen body.
4. dissolution type sand bridge screen casing according to claim 1, which is characterized in that the height of projection of the supporting arch according to
Lower formula determines：
e≦2D10
In formula, e is the height of projection of supporting arch；
D10It represents on sand accumulation percentile curve, is counted from big grain size and account for the hundred of the diameter of the sand grains corresponding to accumulating weight 10%
Divide ratio.
5. dissolution type sand bridge screen casing according to claim 1, which is characterized in that the width of the filter seam is according to stratum sand sample
Grain size analysis be designed.
6. dissolution type sand bridge screen casing according to claim 1 or 5, which is characterized in that the width of the filter seam is equal to support
The height of projection of arch.
7. dissolution type sand bridge screen casing according to claim 1, which is characterized in that the angle of the supporting arch and the filter seam
It is 3 ° -5 °.
8. dissolution type sand bridge screen casing according to claim 1 or claim 7, which is characterized in that when the grain size of formation particle is
When 0.25mm-0.1mm, design supporting arch and the angle of filter seam are 3 °；
When the grain size of formation particle is 0.5mm-0.25mm, design supporting arch and the angle of filter seam are 4 °；
When the grain size of formation particle>When 0.5mm, design supporting arch and the angle of filter seam are 5 °.
9. dissolution type sand bridge screen casing according to claim 1, which is characterized in that independent between the supporting arch and supporting arch
Setting.
10. dissolution type sand bridge screen casing according to claim 1, which is characterized in that the solubility coating is epoxy resin
Coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711456301.5A CN108457626A (en) | 2017-12-28 | 2017-12-28 | A kind of dissolution type sand bridge screen casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711456301.5A CN108457626A (en) | 2017-12-28 | 2017-12-28 | A kind of dissolution type sand bridge screen casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108457626A true CN108457626A (en) | 2018-08-28 |
Family
ID=63220878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711456301.5A Pending CN108457626A (en) | 2017-12-28 | 2017-12-28 | A kind of dissolution type sand bridge screen casing |
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| CN (1) | CN108457626A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2722750C1 (en) * | 2019-05-17 | 2020-06-03 | Алексей Федорович Кутиев | Downhole filter with soluble element |
| CN112901125A (en) * | 2019-12-03 | 2021-06-04 | 中国石油天然气股份有限公司 | Secondary sand control tubular column of casing damage detritus well |
| WO2022116272A1 (en) * | 2020-12-04 | 2022-06-09 | 中国石油大学(北京) | Screen pipe |
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| CN205577958U (en) * | 2016-03-04 | 2016-09-14 | 中国石油集团渤海钻探工程有限公司 | Novel from expansion screen pipe |
| CN106567691A (en) * | 2016-10-11 | 2017-04-19 | 中国石油天然气股份有限公司 | Operating method for open-hole and screen-pipe completion and pipe string |
| CN206608149U (en) * | 2017-03-02 | 2017-11-03 | 中国石油大学(北京) | Self-adaptive controlled water pressure-bearing screen casing |
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| US7360593B2 (en) * | 2000-07-27 | 2008-04-22 | Vernon George Constien | Product for coating wellbore screens |
| CN201318157Y (en) * | 2008-12-19 | 2009-09-30 | 西部钻探吐哈钻井工艺研究院 | Oil-soluble impervious screen pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2722750C1 (en) * | 2019-05-17 | 2020-06-03 | Алексей Федорович Кутиев | Downhole filter with soluble element |
| CN112901125A (en) * | 2019-12-03 | 2021-06-04 | 中国石油天然气股份有限公司 | Secondary sand control tubular column of casing damage detritus well |
| WO2022116272A1 (en) * | 2020-12-04 | 2022-06-09 | 中国石油大学(北京) | Screen pipe |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20180828 |