CN108841366A - High-temperature leakage-proof plugging agent and preparation method and application thereof - Google Patents
High-temperature leakage-proof plugging agent and preparation method and application thereof Download PDFInfo
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- CN108841366A CN108841366A CN201810605631.4A CN201810605631A CN108841366A CN 108841366 A CN108841366 A CN 108841366A CN 201810605631 A CN201810605631 A CN 201810605631A CN 108841366 A CN108841366 A CN 108841366A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 99
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 87
- 239000004568 cement Substances 0.000 claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000010439 graphite Substances 0.000 claims abstract description 19
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003921 oil Substances 0.000 claims abstract description 12
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 11
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 11
- 239000011734 sodium Substances 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000002265 prevention Effects 0.000 claims description 35
- 238000012360 testing method Methods 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 239000003129 oil well Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 claims description 10
- 239000001263 FEMA 3042 Substances 0.000 claims description 10
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 claims description 10
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 claims description 10
- 229940033123 tannic acid Drugs 0.000 claims description 10
- 235000015523 tannic acid Nutrition 0.000 claims description 10
- 229920002258 tannic acid Polymers 0.000 claims description 10
- 239000002994 raw material Substances 0.000 abstract description 6
- 239000002981 blocking agent Substances 0.000 abstract description 3
- 230000005465 channeling Effects 0.000 abstract description 3
- 229920002253 Tannate Polymers 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000010795 Steam Flooding Methods 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention provides a high-temperature leakage-proof plugging agent and a preparation method and application thereof. The blocking agent comprises, by mass, 100% of ultrafine cement 40-60%, graphite particles 10-15%, silicon powder 10-15%, sodium tannate 1-3%, and the balance of water. The preparation method of the high-temperature leakage-proof plugging agent is simple and convenient, and the raw materials are easy to obtain; the prepared plugging agent has good temperature resistance, high pressure resistance, high breakthrough pressure resistance, good leakage resistance and high plugging capacity strength, and can be applied to the sealing and channeling sealing process technology of the high-temperature and high-pressure leakage well of the oil field to realize the sealing and channeling sealing of the high-temperature and high-pressure leakage serious well.
Description
Technical field
The invention belongs to oil well blocking technology field, it is related to a kind of high temperature lost circulation prevention sealing agent and preparation method thereof and answers
With.
Background technique
Viscous crude mainly uses steam soak and steam flooding technology, exploitation the middle and later periods, due to more rounds steam soak and
Prolonged steam drives, so that stratum steam forms the has channeling of fingering and ground interlayer；The casing of oil well is damaged and is missed；Outside casing
Cementing concrete fails that formation pipe is outer to alter because prolonged high temperature and pressure corrodes, in this way, the high temperature and high pressure steam of injection may be taken
With the natural gas and H in oil well2S gas alters channel and casing loses leak source and scurries out ground by the way that pipe is outer, generate explosion or
It makes one to be poisoned, if foring ground large area gas leakage, would have to shut down some producing wells, it could even be possible to shutting down part area
Block, this not only causes to seriously endanger to personal safety and environmental pollution, also causes and seriously affects to thickened oil recovery production, because
This, it is necessary to sealing is implemented to these absorption wells, envelope is altered, shut-in well measure carries out comprehensive treatment.
Summary of the invention
It is altered outside for oil well leakage, oil gas under thickened oil recovery process high temperature in the prior art, difficult the problems such as blocking, this hair
It is bright to be designed to provide a kind of high temperature lost circulation prevention sealing agent and preparation method thereof；The sealing agent preparation method is simple, and raw material is easy
, the sealing agent viscosity being prepared is lower, is easy to stabilization in pump barrel, high temperature resistant, anti-high pressure.The present invention also aims to mention
For application of the sealing agent in the pit shaft high temperature lost circulation prevention of oil field, it is applied in the pit shaft high temperature lost circulation prevention of oil field, lost circulation prevention
Property good, high temperature resistant, anti-high pressure, have high breakthrough pressure, the needs of high temperature and pressure absorption well can be met.
The purpose of the present invention is achieved by the following technical programs：
On the one hand, the present invention provides a kind of high temperature lost circulation prevention sealing agent, by the sealing agent mass percent be 100% in terms of,
Including：
In above-mentioned sealing agent, it is preferable that the superfine cement is G grades of oil-well cements.
In above-mentioned sealing agent, it is preferable that G grade specific surface area >=7000cm of the superfine cement2/g。
In above-mentioned sealing agent, G grades of oil-well cements are one of the main component of high temperature absorption well sealing agent, G grades of specific surfaces
Product >=7000cm2/ g has good dissolubility suitable for the grouting of general fine spatial in water, and main function is conduct
The principal element of the main closure of high temperature absorption well.
In above-mentioned sealing agent, it is preferable that the granularity of the graphite particle is 0.2-10mm.
In above-mentioned sealing agent, graphite particle is one of the main component of high temperature lost circulation prevention sealing agent, and graphite particle size is
0.2-10mm, it is not soluble in water, main function be in high temperature lost circulation prevention sealing agent as the High Temperature Plugging Agent of lost circulation prevention it is main because
Element.
In above-mentioned sealing agent, silicon powder loses one of the packing material of sealing agent as high temperature resistant leak-proof, acts on for mentioning
The temperature tolerance of sealing agent under high temperature.
In above-mentioned sealing agent, tannic acid sodium loses one of the packing material of sealing agent as high temperature resistant leak-proof, has in water
Good dissolubility, wherein the deferred action for sealing agent under high temperature.
Superfine cement, graphite particle, four kinds of sealing agents of silicon powder and tannic acid sodium ingredient between be synergistic effect；Ultra-fine water
The intensity for enhancing sealing agent under high temperature is played in mud, silicon powder and the effect of tannic acid sodium, and graphite particle is for leakage property below high temperature；
If removing superfine cement in the high temperature lost circulation prevention sealing agent, only when silicon powder, tannic acid sodium and graphite particle, rise at high temperature not
To the effect of shut-off capacity, there can be no solidification phenomenons in stratum；If it is graphite particle that the High Temperature Plugging Agent, which is removed, for high temperature
Miss serious well no matter be pumped into stratum closure dosage number all not enough, formation leakage is still very serious, subsequent high temperature well
Sealing, plugging technology cannot achieve.
In above-mentioned sealing agent, it is preferable that the density of the sealing agent is 1.85g/cm3-1.90g/cm3。
On the other hand, the present invention also provides the preparation methods of above-mentioned sealing agent comprising following steps：
Water is stirred into swirl shape in advance, sequentially adds superfine cement, silicon powder, tannic acid sodium and graphite particle, when addition
Room temperature stirs at low speed, and high-speed stirred after the completion of addition obtains the sealing agent.
In above-mentioned preparation method, it is preferable that the revolving speed stirred at low speed is that 2500 turns/min-3000 turns/min.
In above-mentioned preparation method, it is preferable that the revolving speed of high-speed stirred is that 7000 turns/min-7500 turns/min.
In above-mentioned preparation method, it is preferable that the time of high-speed stirred is 1min-2min.
Technology is altered in oil field high temperature and pressure absorption well sealing, envelope in another aspect, the present invention also provides above-mentioned sealing agents
In application.
In above-mentioned application, it is preferable that the application the specific steps are：
The sealing agent prepared will be stirred in advance, test density reaches 1.85g/cm3-1.90g/cm3, disposable to inject
In stratum, completes to block high temperature and pressure absorption well, seals the closure for altering technique.
In above-mentioned application, it is preferable that high temperature range is 200-300 DEG C；High pressure range is 5MPa-10MPa.
The preparation method of high temperature lost circulation prevention sealing agent of the invention is easy, and raw material is easy to get；The sealing agent heatproof being prepared
Performance is good, high temperature resistant, anti-high pressure, has high breakthrough pressure, and lost circulation prevention is good, shut-off capacity intensity is high, is applied to oil
Field high temperature and pressure absorption well sealing, envelope are altered in technology, be can be realized and are missed the sealing of serious well to high temperature and pressure, envelope is altered
It blocks.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
Embodiment 1
The present embodiment provides a kind of high temperature lost circulation prevention sealing agent, it is in terms of 100% by the sealing agent mass percent, including：
Superfine cement is G grades of oil-well cements, G grades of specific surface area >=7000cm2/g；The granularity of graphite particle is 0.2-
0.6mm。
The present embodiment also provides the preparation method of the high temperature lost circulation prevention sealing agent, specially：Scene is stirred in advance with water
At swirl shape, superfine cement, silicon powder and tannic acid sodium are sequentially added, is eventually adding graphite particle, room temperature low speed (2500 when addition
Turn/min-3000 turns/min) stirring, high speed (7000 turns/min-7500 turns/min) stirring 1min-2min, is obtained after the completion of being added
Obtain the sealing agent.The density of the sealing agent is 1.89g/cm3。
Embodiment 2
The present embodiment provides a kind of high temperature lost circulation prevention sealing agent, it is in terms of 100% by the sealing agent mass percent, including：
Superfine cement is G grades of oil-well cements, G grades of specific surface area >=7000cm2/g；The granularity of graphite particle is 0.2-6mm.
The present embodiment also provides the preparation method of the high temperature lost circulation prevention sealing agent, specially：Scene is stirred in advance with water
At swirl shape, superfine cement, silicon powder and tannic acid sodium are sequentially added, is eventually adding graphite particle, room temperature low speed (2500 when addition
Turn/min-3000 turns/min) stirring, high speed (7000 turns/min-7500 turns/min) stirring 1min-2min, is obtained after the completion of being added
Obtain the sealing agent.The density of the sealing agent is 1.89g/cm3。
Embodiment 3
The present embodiment provides a kind of high temperature lost circulation prevention sealing agent, it is in terms of 100% by the sealing agent mass percent, including：
Superfine cement is G grades of oil-well cements, G grades of specific surface area >=7000cm2/g；The granularity of graphite particle is 0.2-6mm.
The present embodiment also provides the preparation method of the high temperature lost circulation prevention sealing agent, specially：Scene is stirred in advance with water
At swirl shape, superfine cement, silicon powder and tannic acid sodium are sequentially added, is eventually adding graphite particle, room temperature low speed (2500 when addition
Turn/min-3000 turns/min) stirring, high speed (7000 turns/min-7500 turns/min) stirring 1min-2min, is obtained after the completion of being added
Obtain the sealing agent.The density of the sealing agent is 1.89g/cm3。
Embodiment 4
The present embodiment provides a kind of high temperature lost circulation prevention sealing agent, it is in terms of 100% by the sealing agent mass percent, including：
Superfine cement is G grades of oil-well cements, G grades of specific surface area >=7000cm2/g；The granularity of graphite particle is 0.2-
10mm。
The present embodiment also provides the preparation method of the high temperature lost circulation prevention sealing agent, specially：Scene is stirred in advance with water
At swirl shape, superfine cement, silicon powder and tannic acid sodium are sequentially added, is eventually adding graphite particle, room temperature low speed (2500 when addition
Turn/min-3000 turns/min) stirring, high speed (7000 turns/min-7500 turns/min) stirring 1min-2min, is obtained after the completion of being added
Obtain the sealing agent.The density of the sealing agent is 1.89g/cm3。
Cure test
High temperature lost circulation prevention sealing agent prepared by above-described embodiment 1-4 carries out indoor high temperature phase change modeling experiment, surveys
Curing time is tried, experimental result is shown in Table 1.
Table 1：
From 1 experimental data of table：Under different mass concentrations, high temperature lost circulation prevention sealing agent pumps in high temperature pit shaft
Time, it is as the upper limit, therefore by changing sealing agent that the time, which is less than sealing agent under hot conditions not occur dodging the solidifying time,
The ratio of each raw material can grasp the pump time of safest high temperature lost circulation prevention sealing agent.
High temperature resistant experiment
Sample test block is made after sealing agent is solidified, is put into high-temperature high-pressure reaction kettle, places into clear water for sample test block
It floods, by the application method of high-pressure bottle, sample test block is subjected to the experiment of 1d-7d heatproof under the conditions of 300 DEG C -350 DEG C.Heatproof
After experiment, sample test block, compression strength of the test sample test block after heatproof experiment are taken out, and compare sample examination before heatproof
The compression strength of block, experimental result are shown in Table 2.
Table 2：
From 2 experimental data of table：By changing the ratio of the raw material of sealing agent, can control pressure is 7.8-
10.2MPa controls the pressure of high temperature lost circulation prevention sealing agent, can satisfy the plugging strength requirement of different measure well.
Sealing ratiod and breakthrough pressure
High temperature lost circulation prevention sealing agent prepared by embodiment 1-4 carries out laboratory core simulated experiment, measures the gap of rock core
Volume PV and core permeability K0.Reinject the sealing agent of 10PV or more.Under the conditions of 90 DEG C, Hou Ning is for 24 hours.Hou Ning terminates,
At room temperature, core permeability K after blocking is surveyed1, continue the rated pressure that device is boosted to 0.1MPa/min hereinafter, if after blocking
Rock core flow out the first drop of liquid pressure be breakthrough pressure.And sealing ratiod and breakthrough pressure gradient are calculated separately as the following formula.
η-sealing ratiod indicates (%) with percentage；
K0Permeability before reservoir core plugging, (10-3 μm of unit millidarcy2)；
K1Permeability after reservoir core plugging, (10-3 μm of unit millidarcy2)；
L- rock core length.
Sealing ratiod and breakthrough pressure after closure, test result are shown in Table 3.
Table 3：
From 3 experimental data of table：The sealing agent sealing ratiod of the embodiment of the present invention can reach 100%, and breakthrough pressure reaches
To 75MPa or more, the plugging strength requirement of different measure well can satisfy.
Embodiment 5
The present embodiment provides the high temperature lost circulation prevention sealing agents of the preparation of embodiment 3 in oil field high temperature and pressure absorption well sealing, envelope
Alter the application in technology.
Du84-50-148Jing is steam injection well, and well depth 715m, steam injection string pen tip is between the oil reservoir upper bound and lower bound, shaft bottom
Well temperature is up to 242 DEG C, tubing pressure 5MPa, casing pressure 2.5MPa, belongs to lifting well head, pit shaft is by the entire pit shaft in the shaft bottom 110m-
Temperature again 200 DEG C -250 DEG C or so fluctuation, well head to bottom pressure 5MPa or so fluctuate, therefore shaft bottom leakage seriously.
The high temperature lost circulation prevention sealing agent is indoors under conditions of 240 DEG C, cure test 1.5h, for 600m's or so
High temperature pit shaft, high temperature lost circulation prevention sealing agent safe can be pumped into stratum in pit shaft, under 350 DEG C of hot conditions, envelope
The pressure of blocking agent can achieve 8.8MPa.Using this formula, lost circulation prevention 30m is increased temperature in the field3, stir, match
Density at sealing agent is 1.89g/cm3.Observation casing pressure variation during squeezing is instead squeezed fresh water balance and is squeezed when casing pressure rises very fast
Grey pressure.It has infused high temperature lost circulation prevention sealing agent and has just pushed up clear water 2.4m again3, upper lifting pipe post 1m-2m, until clear water is shown in backwash, wash-off
Extra high temperature lost circulation prevention sealing agent.It waits and coagulates 24 hours, to well section pressure testing 15MPa, 30 minutes pressure drop≤0.5Mpa is blocked, block
It works well.
In conclusion the preparation method of high temperature lost circulation prevention sealing agent of the invention is easy, raw material is easy to get；The envelope being prepared
Blocking agent heat resistance is good, high temperature resistant, anti-high pressure, has high breakthrough pressure, and lost circulation prevention is good, shut-off capacity intensity is high, by it
It is altered in technology applied to oil field high temperature and pressure absorption well sealing, envelope, can be realized the envelope for missing serious well to high temperature and pressure
The closure that layer, envelope are altered.
Claims (10)
1. a kind of high temperature lost circulation prevention sealing agent, which is characterized in that by the sealing agent mass percent be 100% in terms of, including：
2. sealing agent according to claim 1, it is characterised in that：The superfine cement is G grades of oil-well cements.
3. sealing agent according to claim 2, it is characterised in that：G grade specific surface area >=7000cm of the superfine cement2/
g。
4. sealing agent according to claim 1, it is characterised in that：The granularity of the graphite particle is 0.2-10mm.
5. sealing agent according to claim 1-4, it is characterised in that：The density of the sealing agent is 1.85g/cm3-
1.90g/cm3。
6. the preparation method of any one of the claim 1-5 sealing agent comprising following steps：
Water is stirred into swirl shape in advance, sequentially adds superfine cement, silicon powder, tannic acid sodium and graphite particle, room temperature when addition
It stirs at low speed, high-speed stirred after the completion of addition obtains the sealing agent.
7. preparation method according to claim 6, it is characterised in that：
The revolving speed stirred at low speed is that 2500 turns/min-3000 turns/min；
Preferably, the revolving speed of high-speed stirred is that 7000 turns/min-7500 turns/min.
8. preparation method according to claim 6, it is characterised in that：The time of high-speed stirred is 1min-2min.
9. any one of the claim 1-5 sealing agent alters answering in technology in oil field high temperature and pressure absorption well sealing, envelope
With.
10. application according to claim 9, which is characterized in that it is described application the specific steps are：
The sealing agent prepared will be stirred in advance, test density reaches 1.85g/cm3-1.90g/cm3, disposably inject stratum
In, it completes to block high temperature and pressure absorption well, seal the closure for altering technique；
Preferably, high temperature range is 200-300 DEG C；High pressure range is 5MPa-10MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810605631.4A CN108841366B (en) | 2018-06-13 | 2018-06-13 | High-temperature leakage-proof plugging agent and preparation method and application thereof |
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| CN201810605631.4A CN108841366B (en) | 2018-06-13 | 2018-06-13 | High-temperature leakage-proof plugging agent and preparation method and application thereof |
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| CN108841366B CN108841366B (en) | 2020-09-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188606A (en) * | 2020-01-14 | 2020-05-22 | 中国石油大学(华东) | Low-temperature expandable graphite for steam injection channeling sealing of heavy oil reservoir and preparation method and application thereof |
| CN111663935A (en) * | 2019-03-08 | 2020-09-15 | 中石化石油工程技术服务有限公司 | Method and system for evaluating shaft annulus air tightness |
| CN112647895A (en) * | 2020-12-28 | 2021-04-13 | 黑龙江弘力通能源技术服务有限公司 | Method for plugging leakage of oil-gas well casing by adopting liquid casing |
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| CN114635680A (en) * | 2022-03-08 | 2022-06-17 | 中国石油大学(北京) | System and method for determining butt seam high control capability of artificial partition plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111663935A (en) * | 2019-03-08 | 2020-09-15 | 中石化石油工程技术服务有限公司 | Method and system for evaluating shaft annulus air tightness |
| CN111663935B (en) * | 2019-03-08 | 2023-05-26 | 中石化石油工程技术服务有限公司 | Method and system for evaluating annular air tightness of shaft |
| CN111188606A (en) * | 2020-01-14 | 2020-05-22 | 中国石油大学(华东) | Low-temperature expandable graphite for steam injection channeling sealing of heavy oil reservoir and preparation method and application thereof |
| CN112647895A (en) * | 2020-12-28 | 2021-04-13 | 黑龙江弘力通能源技术服务有限公司 | Method for plugging leakage of oil-gas well casing by adopting liquid casing |
| CN113234424A (en) * | 2021-05-20 | 2021-08-10 | 嘉华特种水泥股份有限公司 | Low-density well cementation cement slurry system suitable for medium-high temperature stratum and preparation method thereof |
| CN113234424B (en) * | 2021-05-20 | 2022-08-19 | 嘉华特种水泥股份有限公司 | Low-density well cementation cement slurry system suitable for medium-high temperature stratum and preparation method thereof |
| CN114635680A (en) * | 2022-03-08 | 2022-06-17 | 中国石油大学(北京) | System and method for determining butt seam high control capability of artificial partition plate |
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