CN109681147A - A kind of horizontal well reservoir selective shut-off method - Google Patents
A kind of horizontal well reservoir selective shut-off method Download PDFInfo
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- CN109681147A CN109681147A CN201910037150.2A CN201910037150A CN109681147A CN 109681147 A CN109681147 A CN 109681147A CN 201910037150 A CN201910037150 A CN 201910037150A CN 109681147 A CN109681147 A CN 109681147A
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to a kind of horizontal well reservoir selective shut-off methods, screen perforation or target interval of the horizontal well interval of reservoir reconstruction as plugging construction is completed；Pit shaft below 30m above to plugging construction target interval top circle and bottom circle within the scope of 30m is handled, and removes burr, foulant, sand setting, the greasy dirt for influencing subsequent construction quality；Tripping in bridge plug sets tubing string, and bridge plug is set the 15m below construction target interval bottom circle；Tripping in cement retainer sets tubing string, and cement retainer is set in the construction above 15m in target interval top circle；Tripping in cement retainer returns intubation column, completes returning for cement retainer and inserts movement；Envelope discharge capacity is tested by design to be carried out cement retainer by oil pipe or coiled tubing direct circulation pump note clear water and tested envelope；Reservoir closure is carried out by design plugging construction discharge capacity and design cement slurry volume；Effective squeeze seal and Hou Ning with pressure can be achieved, the engineering accident risk in conventional squeeze seal operation can be evaded, greatly improve the effect and efficiency of the closure of horizontal well reservoir.
Description
Technical field
The present invention relates to exploration of oil and gas field and development field, in particular to a kind of horizontal well reservoir selective shut-off method.
Background technique
Conventional reservoir method for blocking are as follows: tripping in blank tubing carries out blocking operation or light casing carries out closure operation.Light casing
Squeeze seal and blank tubing process for extruding and sealing principle are similar, mainly illustrate light casing squeeze seal below.
Blank tubing blocks operation: being tripping in blank tubing (several to be sequentially connected with oil pipe by respective screw thread) in casing
Carry out closure operation.Cement slurry is pumped into oil pipe by ground pump group, the downlink along oil pipe pipe, is flowed out from oil pipe bottom end, from penetrating
Hole eyelet enters stratum, completes the squeeze seal of reservoir.
After cement slurrypump is infused, it is necessary to continue pump note clear water (at this time needs being opened to the gate of closing annular space) and carry out
Well-flushing, clear water are flowed into out of oil pipe pipe, flow out to ground from annular space.So circulation, until by cement slurry extra in casing and
Extra cement slurry is cleaned and is rushed to ground in oil pipe.The purpose of well-flushing is to prevent cement slurry sets, by tubing string it is dead
In pit shaft.After well-flushing, flowline is played, in closing well Hou Ning.
During blank tubing squeeze seal, it is necessary to which the link including well-flushing, oil pipe, the presence of the two links result in gloss oil
It is inevitably present the process of pressure release during pipe squeeze seal, i.e., is not able to maintain pressure when pump priming mud, and at this
Cement slurry is waited to complete Hou Ning under pressure condition.
After pressure release, the high pressure water mud that squeezing enters reservoir, which will return, to be spat into pit shaft, here it is cannot effectively squeeze seal and
Hou Ning with pressure.
Summary of the invention
The object of the present invention is to provide a kind of horizontal well reservoir selective shut-off methods, and which solve existing level well reservoirs
Block cannot effectively squeeze seal and Hou Ning with pressure problem, horizontal well reservoir selective shut-off method may be implemented effectively block and band
Press Hou Ning.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of horizontal well reservoir selective shut-off method, characterized by the following steps:
1) it screens unwanted perforation or target interval of the horizontal well interval of reservoir reconstruction as plugging construction is completed；
2) pit shaft within the scope of 30m below 30m above to plugging construction target interval top circle and bottom circle is handled, wellbore treatments
Scraping is carried out to internal surface of sleeve pipe using scraper column of casing, removes burr, foulant, sand setting, the oil for influencing subsequent construction quality
Scraper column of casing is extracted pit shaft after removing by dirt；
3) tripping in bridge plug sets tubing string, bridge plug is set the 15m below construction target interval bottom circle, error is no more than ± 0.5m；
4) tripping in cement retainer sets tubing string, cement retainer is set in the construction above 15m in target interval top circle, error is not
More than ± 0.5m；
5) tripping in cement retainer returns intubation column, completes returning for cement retainer and inserts movement；
6) envelope discharge capacity is tested by design to be carried out cement retainer by several oil pipes or several coiled tubing direct circulations pump note clear water and tested envelope；
7) reservoir closure is carried out by design plugging construction discharge capacity and design cement slurry volume；
8) after cement slurrypump note, note clear water is pumped by oil pipe direct circulation and is replaced；
9) oil pipe, the hole volume that at least 1.5 times of reacting cycle well-flushing are above mentioned；
10) play that the bridge plug out in pit shaft sets tubing string, cement retainer sets tubing string and cement retainer returns intubation column, marquis
It is solidifying；
11) using mill tubing string is bored, by cement retainer, cement plug, the bridge plug in pit shaft, all brill is removed, and brill will bore mill pipe after removing again
Column takes out out of pit shaft；
12) it reuses scraper column of casing and scraping is carried out to the internal surface of sleeve pipe of construction interval, again by casing scraping after the completion of scraping
Tubing string takes out out of casing.
Further, plugging construction target interval must not be with plugging construction target interval top or lower part in the step 1)
Adjacent interval there are interlayer channellings；
The interlayer channelling refers to each interval ganging up between production casing and cement sheath or cement sheath and stratum.
Further, the scraper column of casing in the step 2) is connected from bottom to top by gauguste cutter, casing scraper, oil pipe
Connect composition.
Further, the bridge plug in the step 3) sets tubing string by bridge plug, bridge plug releasing tool, oil pipe or coiled tubing
Connection composition from bottom to top.
It is set further, the cement retainer in the step 4) sets tubing string by cement retainer, cement retainer
Tool, rigid centralizer, oil pipe or coiled tubing are formed by connecting from bottom to top.
Further, cement retainer in the step 5) return intubation column by with matched time intubation work of cement retainer
Tool, steel band type centralizer, oil pipe or coiled tubing are formed by connecting from bottom to top.
Further, the cement retainer in the step 6) tests envelope, clear water is infused by oil pipe or coiled tubing direct circulation pump,
It pumps fluence and is not less than 1 hole volume.
Further, the cement slurry in the step 7) is two kinds of cement slurry, respectively cement slurry I and cement slurry
Ⅱ；
The cement slurry I includes G class g cement, fluid loss agent, retarder and dispersing agent；The G class g cement, delays fluid loss agent
Solidifying agent and dispersing agent are specific as follows in parts by weight:
The G class g cement: 110-112 parts by weight；
The fluid loss agent: 6~8 parts by weight；
The retarder: 0.85~1.3 parts by weight；
The dispersing agent: 0.35~0.65 parts by weight；
The density of the cement slurry I is 1.51~1.79g/cm3, the first 300 minutes thick time；
The cement slurry I accounts for the 60% of design cement slurry total amount, for blocking the hydraulic fracture and reservoir pore space of distal end in pit shaft；
The cement slurry II includes G class g cement, early strength agent, fluid loss agent, retarder and dispersing agent；The G class g cement, morning are strong
Agent, fluid loss agent, retarder and dispersing agent are specific as follows in parts by weight:
The G class g cement: 116-119 parts by weight；
The early strength agent: 3.5~5.5 parts by weight；
The fluid loss agent: 5~9 parts by weight；
The retarder: 1.1~1.6 parts by weight；
The dispersing agent: 0.35~0.65 parts by weight；
The density of the cement slurry II is 1.81-1.99g/cm3, the first 200 minutes thick time；
The cement slurry II accounts for the 40% of design cement slurry total amount, for blocking the hydraulic fracture and reservoir pore space in nearly pit shaft area
And borehole.
Further, the replacement in the step 8) is intermittent replacement mode；It is every in oil pipe to replace the clear of 100m depth
Stop after water etc. 1 minute, then stop 1 minute after the clear water of turn on pump replacement 100m depth etc., so recycles, until by the cement in oil pipe
Slurry all replaces out cement retainer.
Further, the brill mill tubing string in the step 11) is by boring mill or junk mill, screw drill, oil pipe or coiled tubing certainly
It is formed by connecting on down.
In conclusion the invention has the following advantages:
Bridge plug (can be understood as a solid plug) is being set to squeeze seal interval lower part, is setting cement to squeeze seal interval top
It holds and device is stayed (to can be understood as a plug, but tool open can be inserted, this tool is exactly above-mentioned time intubation, after opening
Plug is just connected to up and down；After tool is extracted, cement retainer becomes a solid plug again).
After squeeze slurry, oil pipe is above mentioned, intubation is at this time returned and is just pulled out from cement retainer, cement is held
It stays device to close, becomes solid plug.
Squeeze seal interval respectively has a solid plug up and down, guarantee to squeeze into reservoir high pressure water mud can not pressure release, until solidifying
Gu here it is Hou Ning with pressure.
The cement slurry squeezed from oil pipe, does not go in the case where lower part has bridge plug to keep off, and top has cement retainer to keep off not increase,
It can only enter interval to be blocked, and from the cement slurry of oil pipe entrance, it is continuously pumped into, realizes effective squeeze seal.
Effective squeeze seal and Hou Ning with pressure can be realized using the above method, the engineering accident wind in conventional squeeze seal operation can be evaded
Danger greatly improves the effect and efficiency of the closure of horizontal well reservoir.
Specific embodiment
Embodiment 1
A kind of horizontal well reservoir selective shut-off method, includes the following steps:
1) it screens unwanted perforation or target interval of the horizontal well interval of reservoir reconstruction as plugging construction is completed；
2) pit shaft within the scope of 30m below 30m above to plugging construction target interval top circle and bottom circle is handled, wellbore treatments
Scraping is carried out to internal surface of sleeve pipe using scraper column of casing, removes burr, foulant, sand setting, the oil for influencing subsequent construction quality
Scraper column of casing is extracted pit shaft after removing by dirt；
3) tripping in bridge plug sets tubing string, bridge plug is set the 15m below construction target interval bottom circle, error is no more than ± 0.5m；
4) tripping in cement retainer sets tubing string, cement retainer is set in the construction above 15m in target interval top circle, error is not
More than ± 0.5m；
5) tripping in cement retainer returns intubation column, completes returning for cement retainer and inserts movement；
6) envelope discharge capacity is tested by design to be carried out cement retainer by several oil pipes or several coiled tubing direct circulations pump note clear water and tested envelope；
7) reservoir closure is carried out by design plugging construction discharge capacity and design cement slurry volume；
8) after cement slurrypump note, note clear water is pumped by oil pipe direct circulation and is replaced；
9) oil pipe, the hole volume that at least 1.5 times of reacting cycle well-flushing are above mentioned；
10) play that the bridge plug out in pit shaft sets tubing string, cement retainer sets tubing string and cement retainer returns intubation column, marquis
It is solidifying；
11) using mill tubing string is bored, by cement retainer, cement plug, the composite bridge plug in pit shaft, all brill is removed, and brill will bore again after removing
Mill tubing string takes out out of pit shaft；
12) it reuses scraper column of casing and scraping is carried out to the internal surface of sleeve pipe of construction interval, again by casing scraping after the completion of scraping
Tubing string takes out out of casing.
It is according to scene that design plugging construction discharge capacity, design in above-mentioned steps, which test envelope discharge capacity and design cement slurry volume,
Actual conditions and set, belong to existing well-known technique.
Bridge plug (can be understood as a solid plug) is being set to squeeze seal interval lower part, is being set to squeeze seal interval top
Cement retainer (can be understood as a plug, but tool open can be inserted, this tool is exactly above-mentioned time intubation, is beaten
Rear plug is opened just to be connected to up and down；After tool is extracted, cement retainer becomes a solid plug again).
After squeeze slurry, oil pipe is above mentioned, intubation is at this time returned and is just pulled out from cement retainer, cement is held
It stays device to close, becomes solid plug.
Squeeze seal interval respectively has a solid plug up and down, guarantee to squeeze into reservoir high pressure water mud can not pressure release, until solidifying
Gu here it is Hou Ning with pressure.
The cement slurry squeezed from oil pipe, does not go in the case where lower part has bridge plug to keep off, and top has cement retainer to keep off not increase,
It can only enter interval to be blocked, and from the cement slurry of oil pipe entrance, it is continuously pumped into, realizes effective squeeze seal.
Effective squeeze seal and Hou Ning with pressure can be realized using the above method, the engineering accident wind in conventional squeeze seal operation can be evaded
Danger greatly improves the effect and efficiency of the closure of horizontal well reservoir.
Embodiment 2
On the basis of embodiment 1, the horizontal well reservoir selective shut-off method be suitable for there are several perforation or
The horizontal well of reservoir reconstruction interval is completed, this method is suitable for the closure operation of a certain interval of above-mentioned horizontal well.
The plugging construction target interval must not there are interlayer channelling phenomenons with the adjacent interval of upper part or lower part.
The interlayer channelling refers to each interval ganging up between production casing and cement sheath or cement sheath and stratum.
Embodiment 3
On the basis of embodiment 1 or 2, the scraper column of casing in the step 2) is by gauguste cutter, casing scraper, oil pipe
Connection composition from bottom to top.
Embodiment 4
On the basis of embodiment 1 or 2 or 3, the bridge plug in the step 3) set tubing string by bridge plug, bridge plug releasing tool,
Oil pipe or coiled tubing connect composition from bottom to top.
Material is the retrievable bridge plug of composite material or cast iron based on the bridge plug.
After the bridge plug sets and gives up, act remaining tubing string in well.
Embodiment 5
On the basis of embodiment 1 or 2 or 3 or 4, the cement retainer in the step 4), which sets tubing string and held by cement, to be stayed
Device, cement retainer sealing tool, rigid centralizer, oil pipe or coiled tubing are formed by connecting from bottom to top.
The cement retainer is suitable for horizontal wellbore using the industry of hydraulic setting and hydraulic releasing principle public affairs
Know tool, is insulated dedicated for the pit shaft of cementing job.
Embodiment 6
On the basis of embodiment 1 or 2 or 3 or 4 or 5, cement retainer in the step 5) return intubation column by with cement
It holds and matched time intubation tool of device, steel band type centralizer, oil pipe or coiled tubing is stayed to be formed by connecting from bottom to top.
The slotting movement of returning of the cement retainer is operated by methods and procedures well known to industry.
Embodiment 7
On the basis of embodiment 1 or 2 or 3 or 4 or 5 or 6, the cement slurry in the step 7) is two kinds of cement
Slurry, respectively cement slurry I and cement slurry II.
The cement slurry I includes G class g cement, fluid loss agent, retarder and dispersing agent；The G class g cement, drop dehydration
Agent, retarder and dispersing agent are specific as follows in parts by weight:
The G class g cement: 110-112 parts by weight；
The fluid loss agent: 6~8 parts by weight；
The retarder: 0.85~1.3 parts by weight；
The dispersing agent: 0.35~0.65 parts by weight；
The density of the cement slurry I is 1.51~1.79g/cm3, the first 300 minutes thick time；
The cement slurry I accounts for the 60% of design cement slurry total amount, for blocking the hydraulic fracture and reservoir pore space of distal end in pit shaft；
The cement slurry II includes G class g cement, early strength agent, fluid loss agent, retarder and dispersing agent；The G class g cement, morning are strong
Agent, fluid loss agent, retarder and dispersing agent are specific as follows in parts by weight:
The G class g cement: 116-119 parts by weight；
The early strength agent: 3.5~5.5 parts by weight；
The fluid loss agent: 5~9 parts by weight；
The retarder: 1.1~1.6 parts by weight；
The dispersing agent: 0.35~0.65 parts by weight；
The density of the cement slurry II is 1.81-1.99g/cm3, the first 200 minutes thick time；
The cement slurry II accounts for the 40% of design cement slurry total amount, for blocking the hydraulic fracture and reservoir pore space in nearly pit shaft area
And borehole.
Pump priming mud first, then the pump priming mud II in the case where not being pumped into any pad liquid.
Cement slurry I is used to block the hydraulic fracture and reservoir pore space of distal end in pit shaft.Cement slurry I is compared with II mobility of cement slurry
More preferably, intensity is lower, the minimum thickening time are as follows: and (I volume of cement slurry/pump priming mud I discharge capacity)+(II volume of cement slurry/
The discharge capacity of pump priming mud II).
Cement slurry II is used to block the hydraulic fracture and reservoir pore space and borehole in nearly pit shaft area, and intensity and density are higher,
Thickening time is shorter.
Conventional organic salt and inorganic salts early strength agent can be applied to the present invention, such as thiosulfuric acid aluminium, silicic acid
Sodium or aluminium chloride.
Early-strength dose commercially available can obtain, for example, American-European section product designation be OS-A early strength agent.
Presently preferred dispersing agent of the present invention is acetone-formaldehyde sulfonated polycondensate.Such as by formaldehyde, acetone, sulphite (such as
Sodium sulfite) the acetone-formaldehyde sulfonated polycondensate that is reacted according to the molar ratio of 2-3:1:0.8-1, sulfonation degree 1.7-
1.9mmol/g.Dispersing agent of the invention can also use commercially available acetone-formaldehyde sulfonated polycondensate, such as the product generation of American-European section
Number FS-13L type dispersing agent.In addition, other conventional cement slurries dispersing agents, such as aldehyde-ketone condensate or naphthalene system dispersing agent can also
To be applied to the present invention.
Currently preferred fluid loss agent is that the ternary of -2 methyl propane sulfonic acid of 2- acrylamide, acrylic acid and acrylamide is total
Polymers.It is preferred that -2 methyl propane sulfonic acid of 2- acrylamide, acrylic acid and acrylamide are 50:45-48:2-5 synthesis according to weight ratio,
Viscosity average molecular weigh is ten thousand dalton of 58-75.Fluid loss agent of the invention commercially available can obtain, such as the product designation of American-European section
The fluid loss agent of FS-23L.
The effect of the retarder is the thickening time for delaying cement slurry.General cement can be employed as the present invention with retarder
Retarder, such as lignosulfonates and its derivative, low molecular weight cellulose and its derivative, hydroxycarboxylic acid, organic phosphine
Acid, boric acid or its salt or compound, phosphate, subphosphate, preferably ethylene diamine tetra methylene phosphonic acid calcium (ethylenediamine tetramethylene
Phosphonic acids calcium), ethylene diamine tetra methylene phosphonic acid sodium (sodium ethylenediamine tetramethylenephosphonate), (ethylenediamine five is sub- for five methylenephosphonic acid of ethylenediamine
Methylphosphonic acid), 2- acrylamide-2-methyl propane sulfonic, two polyphosphate sodiums, sodium tripolyphosphate, calgon etc..
Embodiment 8
On the basis of embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7, the replacement in the step 8) is intermittent replacement mode.
Stop 1 minute after every clear water for replacing 100m depth etc. in oil pipe, then stops 1 after the clear water of turn on pump replacement 100m depth etc.
Minute, it so recycles, until the cement slurry in oil pipe is all replaced out cement retainer.
Replace the internal volume calculating that liquid measure is pressed into well oil pipe.
Embodiment 9
On the basis of embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, brill in the step 11) mill tubing string by bore mill or
Junk mill, screw drill, oil pipe or coiled tubing are formed by connecting from bottom to top.
Embodiment 10
On the basis of embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, scraper column of casing in the step 12) with
Step 2 is identical.
Embodiment 11
The present embodiment proposes that a specific real time data is illustrated, and the present embodiment is adopted with the aforedescribed process to Changqing oilfields
Certain layer of position of a bite horizontal well carries out closure operation.
The well well depth 3600m, horizontal segment length 1200m, production string internal diameter 124.26mm, early period use hydraulic jet perforation
Mode has carried out perforation in well 3350.0m, perforated interval Liquid output decline, aqueous rising in later period production process.
Casing scraper is carried with the oil pipe of outer diameter 73.02mm, wall thickness 5.51mm and enters well, to well 3320.0-3380.0m
Well section has carried out scraping repeatedly, has carried out abundant flushing to pit shaft using direct circulation and reacting cycle well-flushing mode.
Tripping in bridge plug sets tubing string, and bridge plug is set at well depth 3365.1m.Tripping in cement retainer sets tubing string, will
Cement retainer is set at well depth 3335.2m.Tripping in cement retainer returns intubation column, complete according to cement retainer operating instruction
Movement is inserted at returning for cement retainer.With the discharge capacity of 150L/min by pumping note clear water 15.0m in oil pipe3, pump note during
Face-pumping pressure gradually rises and finally the stable annular space during 13.0-15.0MPa or so, pump note does not return water.Above-mentioned work progress
Show that cement retainer tests sealing lattice, qualification is squeezed in examination.
3335.2m to the 3365.1m well section and its corresponding perforated interval insulated to the well by bridge plug and cement retainer is squeezed
Water shutoff mud 45.0m3, then 10.1m is replaced with clear water3。
Act whole tubing strings in well, Hou Ning 72 hours.
It bores mill tubing string cement retainer, cement plug, the bridge plug in pit shaft are all bored and removed.
Scraper column of casing carries out scraping to the internal surface of sleeve pipe of construction interval.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used for solving in the present embodiment
Relative positional relationship, the motion conditions etc. between component each under a certain particular pose are released, if the particular pose changes
When, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being related to " first ", " second " etc. is used for description purposes only, it is not understood to indicate or imply it
Relative importance or the quantity for implicitly indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can
To explicitly or implicitly include at least one this feature.
Technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
Claims (10)
1. a kind of horizontal well reservoir selective shut-off method, characterized by the following steps:
1) it screens unwanted perforation or target interval of the horizontal well interval of reservoir reconstruction as plugging construction is completed；
2) pit shaft within the scope of 30m below 30m above to plugging construction target interval top circle and bottom circle is handled, wellbore treatments
Scraping is carried out to internal surface of sleeve pipe using scraper column of casing, removes burr, foulant, sand setting, the oil for influencing subsequent construction quality
Scraper column of casing is extracted pit shaft after removing by dirt；
3) tripping in bridge plug sets tubing string, bridge plug is set the 15m below construction target interval bottom circle, error is no more than ± 0.5m；
4) tripping in cement retainer sets tubing string, and cement retainer is set in the construction above 15m in target interval top circle, error
No more than ± 0.5m；
5) tripping in cement retainer returns intubation column, completes returning for cement retainer and inserts movement；
6) envelope discharge capacity is tested by design to be carried out cement retainer by several oil pipes or several coiled tubing direct circulations pump note clear water and tested envelope；
7) reservoir closure is carried out by design plugging construction discharge capacity and design cement slurry volume；
8) after cement slurrypump note, note clear water is pumped by oil pipe direct circulation and is replaced；
9) oil pipe, the hole volume that at least 1.5 times of reacting cycle well-flushing are above mentioned；
10) play that the bridge plug out in pit shaft sets tubing string, cement retainer sets tubing string and cement retainer returns intubation column, marquis
It is solidifying；
11) using mill tubing string is bored, by cement retainer, cement plug, the bridge plug in pit shaft, all brill is removed, and brill will bore mill pipe after removing again
Column takes out out of pit shaft；
12) it reuses scraper column of casing and scraping is carried out to the internal surface of sleeve pipe of construction interval, again by casing scraping after the completion of scraping
Tubing string takes out out of casing.
2. a kind of horizontal well reservoir selective shut-off method as described in claim 1, it is characterised in that: in the step 1)
Plugging construction target interval must not there are interlayer channellings with the adjacent interval on plugging construction target interval top or lower part；
The interlayer channelling refers to each interval ganging up between production casing and cement sheath or cement sheath and stratum.
3. a kind of horizontal well reservoir selective shut-off method as described in claim 1, it is characterised in that: in the step 2)
Scraper column of casing connected and form from bottom to top by gauguste cutter, casing scraper, oil pipe.
4. a kind of horizontal well reservoir selective shut-off method as described in claim 1, it is characterised in that: in the step 3)
Bridge plug set tubing string and connected from bottom to top by bridge plug, bridge plug releasing tool, oil pipe or coiled tubing and form.
5. a kind of horizontal well reservoir selective shut-off method as described in claim 1, it is characterised in that: in the step 4)
Cement retainer set tubing string by cement retainer, cement retainer sealing tool, rigid centralizer, oil pipe or coiled tubing
It is formed by connecting from bottom to top.
6. a kind of horizontal well reservoir selective shut-off method as described in claim 1, it is characterised in that: in the step 5)
Cement retainer return intubation column by with matched time intubation tool of cement retainer, steel band type centralizer, oil pipe or continuous oil
Pipe is formed by connecting from bottom to top.
7. a kind of horizontal well reservoir selective shut-off method as described in claim 1, it is characterised in that: in the step 6)
Cement retainer test envelope, by oil pipe or coiled tubing direct circulation pump note clear water, pump fluence be not less than 1 hole volume.
8. a kind of horizontal well reservoir selective shut-off method as described in claim 1, it is characterised in that: in the step 7)
Cement slurry be two kinds of cement slurry, respectively cement slurry I and cement slurry II；
The cement slurry I includes G class g cement, fluid loss agent, retarder and dispersing agent；The G class g cement, delays fluid loss agent
Solidifying agent and dispersing agent are specific as follows in parts by weight:
The G class g cement: 110-112 parts by weight；
The fluid loss agent: 6~8 parts by weight；
The retarder: 0.85~1.3 parts by weight；
The dispersing agent: 0.35~0.65 parts by weight；
The density of the cement slurry I is 1.51~1.79g/cm3, the first 300 minutes thick time；
The cement slurry I accounts for the 60% of design cement slurry total amount, for blocking the hydraulic fracture and reservoir pore space of distal end in pit shaft；
The cement slurry II includes G class g cement, early strength agent, fluid loss agent, retarder and dispersing agent；The G class g cement, morning are strong
Agent, fluid loss agent, retarder and dispersing agent are specific as follows in parts by weight:
The G class g cement: 116-119 parts by weight；
The early strength agent: 3.5~5.5 parts by weight；
The fluid loss agent: 5~9 parts by weight；
The retarder: 1.1~1.6 parts by weight；
The dispersing agent: 0.35~0.65 parts by weight；
The density of the cement slurry II is 1.81-1.99g/cm3, the first 200 minutes thick time；
The cement slurry II accounts for the 40% of design cement slurry total amount, for blocking the hydraulic fracture and reservoir pore space in nearly pit shaft area
And borehole.
9. a kind of horizontal well reservoir selective shut-off method as described in claim 1, it is characterised in that: in the step 8)
Replacement be intermittent replacement mode；Stop 1 minute after every clear water for replacing 100m depth etc. in oil pipe, then turn on pump replaces 100m depth
Stop after the clear water of degree etc. 1 minute, so recycle, until the cement slurry in oil pipe is all replaced out cement retainer.
10. a kind of horizontal well reservoir selective shut-off method as described in claim 1, it is characterised in that: the step 11)
In brill mill tubing string by bore mill or junk mill, screw drill, oil pipe or coiled tubing be formed by connecting from bottom to top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910037150.2A CN109681147A (en) | 2019-01-15 | 2019-01-15 | A kind of horizontal well reservoir selective shut-off method |
Applications Claiming Priority (1)
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Effective date of registration: 20201030 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: 610056 6 Chenghua District chase street, Chengdu, Sichuan Applicant before: CNPC Chuanqing Drilling Engineering Co.,Ltd. Applicant before: CHANGQING DOWNHOLE TECHNOLOGY OPERATION COMPANY OF CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. |
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Application publication date: 20190426 |