CN109868125A - A kind of deep drilling well high bearing strength sealing agent and preparation method thereof - Google Patents
A kind of deep drilling well high bearing strength sealing agent and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of deep drilling well high bearing strength sealing agents and preparation method thereof in ultra-deep petroleum drilling engineering field.The high bearing strength sealing agent of the deep drilling well, includes cement, cement additive, nano-composite material, microfibre material and water；In terms of wherein by cement for 100 parts by weight, nano-composite material is 0.5~5 part, preferably 1~3 part；Microfibre material is 1~10 part, preferably 3~6 parts；Water is 20~60 parts.Lost Circulation Material with High Strength of the present invention can increase substantially resistance to compression and the flexural strength of leak stopping slurry, have significant plugging effect.The sealing agent is suitable for severe mud losses caused by blocking transverse crack, broken rock, and the closure of the long open hole section of more set pressure series of strata, the shock resistance breaking capacity for improving the Behavior of Hardened Cement Paste of sealing agent and leakage channel wall bonding capacity and formation, is able to solve the high-intensitive blocking construction requirement of long open hole section, 30MPa or more.
Description
Technical field
The present invention relates to the drilling well leakage inorganic agents in ultra-deep petroleum drilling engineering to be furtherly related to a kind of deep drilling
Well high bearing strength sealing agent and preparation method thereof.
Background technique
Leakage is one of complex situations common in drilling process, it can not only expend drilling time, loses mud, and
It is possible that causing a series of complex situation such as bit freezing, blowout, well slough, even results in wellbore and scrap, cause heavy economic losses.With
The further expansion in oil-gas exploration and development field, the stratum for boring chance is increasingly sophisticated, and there is Low pressure reservoir and cracks, solution cavity
Serious thief zone；Into the oil field of exploration and development middle and later periods, there is macropores and serious stratum to lose in various degree on stratum
There are circulation problems in wellbore construction more in empty phenomenon.
At present on scene the blocking method that uses have static leak stopping, bridge material leak stopping, the leak stopping of high dehydration slurry, temporarily block up method,
Chemical plugging, inorganic gel leak stopping, soft or hard plug leak stopping, compound leak stopping etc. take strong brill tripping in for the lost-circulation zone of especially severe
Casing or expansion tube are blocked.To permeability loss, in, small crack and porous formation leakage, adjustment leakage, which is lost etc., to be had
Effective means, leak stopping success rate can be up to 90% or more.But it is (or big to sensibility (or long section) pressure break formula leakage, large fracture
Solution cavity) leakage, leak stopping success rate is lower, there is the phenomenon that leak stopping repeatedly, more stifled more leakage.
In general, bridge material leak stopping, the leak stopping of high dehydration slurry, temporary stifled method etc. are the inert materials with variable grain gradation
Carry out leak stopping, but its leakage channel build bridge, filling, the shielded layer intensity of formation is not high, be generally used for for set up circulation and
The temporary closure taken；Chemical plugging can use PMN chemical gel, Lauxite, liquid sodium silicate, hydrolysis polypropylene thick slurry, conjunction
At latex etc..A kind of intelligent chemical gel leak stopping now newly developed has been applied on site, this is one kind with high molecular polymer
Gel is the sealing agent of host agent, and this sealing agent has strong shear thinning behavior, certain flow resistance, immiscible with water flooding
The advantages of, under differential pressure action the leakage of the bad determination of leak position can be tackled automatically into drop ply.But its structure
Power, intensity are not big enough, and bearing capacity is limited, big or the serious well of leakage must cooperate other blocking methods in leakage pressure difference.
Inorganic gel leak stopping is prepared based on cement and various cement mixing thick slurrys, is suitable for blocking transverse crack, broken rock
Caused by severe mud losses.But cement slurry is formed by Behavior of Hardened Cement Paste in leakage channel condensation, it is easily strong during subsequent well
It is crushed under percussion, so the Behavior of Hardened Cement Paste that leak stopping needs will not only have high bearing strength, also to there is good shock resistance
Breaking capacity, to meet the requirement of subsequent drilling.
Kinds of fibers used in fibre cement and fiber concrete as Modern Composite Materials is various, can divide by its material
Are as follows: metal material, such as stainless steel fibre and low-carbon steel fibre；Inorfil, such as asbestos fibre, glass fibre, boron fibre, carbon fiber
Dimension etc.；Synthetic fibers, such as nylon, polyester, polypropylene fiber；Plant fiber, such as bamboo fibre, flaxen fiber.At present steel fibre,
Glass fibre, polypropylene fibre, carbon fiber use are more universal.These fibers are commonly used in the cement of architectural engineering, Shao Shuoyong
In the well cementation of petroleum works, only a few by petroleum works institute, Southwest Petrol University for being studied in drilling leakage blockage construction
Fiber leak-stopping cement mortar system has preferable plugging effect, but after addition fiber, the intensity of leak stopping slurry only improves 1MPa, says
Bright fiber selected by it is little to intensity effect is improved.
The Introduction To Cn Patent of Publication No. CN 101063034A is a kind of to enhance oil well cement paste with micro metal fiber
Method.By the solid-phase mixture in oil well cement paste 0.5~5% weight of addition, diameter is 0.01~0.1mm for the invention,
Length is the micro metal fiber of 3~15mm, for the leak stopping in cementing the well.But micro metal fiber used in the patent is straight
Diameter is smaller, and the maximum compressive strength of leak stopping slurry is only 26MPa.
United States Patent (USP) US7,331,391B2 describes a kind of method for preventing leakage in drilling process and handling leakage.
It is added in a pumpable water-based fluid by a kind of additive.Additive is the fibre of dispersible 10~15mm of length in water
Dimension such as glass fibre, polymer fiber, it is 0.5~6 pounds per barrel that concentration, which is added, and pumpable water-based fluid is less than comprising diameter
300 microns of solid particle, the fluid comprising solid particle can be used as drilling fluid or the small leakage quantity leakage of processing.But in the invention
Fiber used is glass fibre, polymer fiber, and the pressure resistance of leak stopping slurry is smaller.
Summary of the invention
It is difficult to block severe mud losses and easily broken STRATIGRAPHIC PROBLEMS to solve existing sealing agent existing in the prior art, this
Invention proposes a kind of high bearing strength sealing agent of deep drilling well.Relate in particular to a kind of high bearing strength sealing agent of deep drilling well
And preparation method thereof.
The application first purpose is to provide a kind of high bearing strength sealing agent of deep drilling well, and the deep drilling well is strong with high pressure-bearing
Spending sealing agent includes cement, cement additive, nano-composite material, microfibre material and water；The cement additive packet
Containing dispersing agent, fluid loss agent, swelling agent, defoaming agent；In terms of wherein by cement for 100 parts by weight, dosage of each component is as follows:
Wherein,
The nano-composite material is the fine filler particles of Nano grade, nanometer of the preferable particle size range in 10~80nm
Silica, nanometer calcium carbonate superfine powder, nano aluminium oxide, nano zine oxide, nano-titanium oxide etc., wherein it is preferred that nanometer titanium dioxide
Silicon.Lost Circulation Material with High Strength of the present invention is by being added this nano-composite material with micro- muscle humidification, Ke Yigai
The microstructure of kind Behavior of Hardened Cement Paste, improves the cementing power of cement slurry and leakage channel wall.
The microfibre material can be selected from length range 5~30mm, diameter range 0.1~1mm metallic fiber
Silk class, specifically can be selected from the market finished product of the lacing wire insertion function of metal fiber wire class, preferably steel wire.It is of the present invention high-strength
Sealing agent is spent by the way that this microfibre material is added, and Behavior of Hardened Cement Paste shock resistance breaking capacity can be improved, can preferably expire
The requirement of sufficient subsequent well construction, the bearing strength and toughness of leak stopping slurry.Microfibre material with lacing wire insertion function
It arranges in pairs or groups and uses with nano-composite material, can reach the performance of higher intensity sealing agent.The present invention in preferred ultra-fine lacing wire material and
After packing material, the compression strength that discovery can significantly promote leak stopping slurry reaches 20MPa or more.
Cement described in Lost Circulation Material with High Strength of the invention is various cement general in the prior art, preferred oil well water
Mud, more preferable G grades of oil-well cement.Oil-well cement refers to a kind of cement that can be used for reinforcing oil well, oil-well cement according to ingredient,
Function etc. can be divided into several ranks such as A, B, C, D, E, F, G, H, and G grades, H grades are current most popular oil-well cements, can lead to
Cross commercially available acquisition.G grades of oil-well cements are used for general oil well cementing, this cement in production in addition to allowing to add proper amount of gypsum,
Other any additives must not be mixed, furthermore this oil-well cement is cooperated using Shi Nengyu multiple additives, is adapted to biggish
Well depth and range of temperature.
In Lost Circulation Material with High Strength of the invention, cement additive preferably cooperates the cement additive of G grades of oil-well cements, including
Dispersing agent, fluid loss agent, swelling agent and defoaming agent etc..
Dispersing agent and fluid loss agent adjustment cement thickening time are controllable, and swelling agent prevents cement volume contraction after hardening.
The dispersing agent be it is a kind of there is the lipophilic interfacial agent with two kinds of opposite natures of hydrophily simultaneously in the molecule, can be uniform
Disperse those and be poorly soluble the solid particle in liquid, while can also prevent the sedimentation and cohesion of solid particle, the present invention is adopted
Dispersing agent can be selected from meeting the lignosulfonates system of Cementing construction requirement, naphthalenesulfonate, sulfonated acetone formaldehyde
At least one of condensation polymer etc..
It when cementing operation, will be leaked when cement slurry flows through osmosis type stratum under stress, cement slurry liquid phase caused to be leaked
Enter stratum, this process is known as " dehydration ".If not controlling dehydration, the reduction of liquid phase volume will be such that cement slurry density increases, greatly
Quantity of fluid, which flows into stratum, makes cement slurry become difficult to pump, and therefore, fluid loss agent is usually added in cement slurry, can control cement
Liquid phase is to permeable formation leak-off in slurry.Under the action of certain pressure difference, the fluid loss agent ultra-fine grain being dispersed in cement slurry enters
It in filter cake micropore, and is deposited between cement granules, infiltrative cement filter cake can be reduced by foring, and be controlled in cement slurry
The speed that liquid is missed to permeable formation achievees the purpose that reduce cement slurry water loss.Fluid loss agent of the invention preferably uses
Polyvinyl alcohol, hydroxyethyl cellulose class, carboxymethyl cellulose and latex class etc. meet petroleum industry standard (SY5504.2-
2005) at least one of fluid loss agent.
When cement setting hardening when, swelling agent volume expansion therewith, rise compensation shrink and tension reinforcing steel bar generate prestressing force with
And it is sufficient filling with the effect in cement gap, and make cement volume expansion, play the role of improving strength of cement.Expansion of the invention
Agent can be selected from meeting any of Cementing construction requirement, can be metal-oxide expansive agent for cement slurry；The metal oxidation
Object type expansive agent for cement slurry is selected from calcium oxide, magnesia, calcium sulphoaluminate type swelling agent, preferably comprises Al2O3、Ca2SO4, CaO etc.
Calcium sulphoaluminate type swelling agent.Swelling agent general action mechanism is lattice dilatation or inflation, but the latter's is fewer.
The effect of defoaming agent is to reduce surface tension, prevents foam from generating, defoaming agent of the invention can be tricresyl phosphate fourth
At least one of lipid, organic silicon, silicone condensation species, preferably tbp class and organic silicon；Wherein, organosilicon
Class can be selected from methyl-silicone oil or silicone oil.
Sealing agent of the invention and leakage channel wall have preferable cementing power, can cementing natural rock core crack.In water
Nano-composite material and the microfibre material with toughness are added in mud, the toughness of cement leak stopping slurry can be enhanced, improves
The shock resistance breaking capacity of plugging material, improves the bearing capacity on stratum in drilling process, can increase substantially the anti-of leak stopping slurry
Pressure and flexural strength have significant plugging effect, save drilling period, realize the requirement of safety drilling.
The second object of the present invention is to providing a kind of preparation method of high bearing strength sealing agent of deep drilling well, it may include following
Step:
Component including cement, nano-composite material, microfibre material, cement additive and water is mixed equal
It is even to get.
Specifically, a kind of preparation method of the high bearing strength sealing agent of deep drilling well, it may include following steps:
(1) flour in the cement and cement additive is sufficiently mixed, solid mixture is made；
(2) liquid substance in the nano-composite material and the cement additive, low speed are added in the water
Liquid mixture is made to being uniformly mixed in stirring；The velocity interval stirred at low speed is generally in 2000~5000 turns/min；
(3) solid mixture made from step (1) is added in step (2) in liquid mixture obtained, high-speed stirring
It mixes to being uniformly mixed, cement slurry is made；The high-speed stirred velocity interval is generally in 10000~14000 turns/min；
(4) the microfibre material is added in cement slurry made from step (3), is stirred at low speed to uniformly mixed.
In view of efficiency and mixed effect, the high-speed stirred time of step (3) is 30~80 in made as described above method
Second, the time that stirs at low speed in step (4) is 10~40 seconds.The above stirring can be used stirring general in the prior art and set
It is standby, such as constant speed stirring instrument.
Effect of the invention
Deep drilling well of the invention has following performance with high bearing strength sealing agent:
1, leak stopping slurry has good rheological property, and drop ply can be entered under lesser pressure difference, solid phase particles
Shape, size, slurries rheological characteristic etc. adapt to the complicated form of leakage channel, and sealing agent can enter leakage by the quantity of design
Layer.
2, the interference that various charges can be resisted into the leak stopping slurry on stratum, various fluids (such as gas and water and oil)
Under effect, in somewhere (stenosis, leakage channel and the direction change as caused by venturi, solid phase filling of nearly pit shaft leakage channel
Place) occur to remain in a standstill, heap and be full of a certain range of leakage channel space.
3, full of a certain range leakage space leak stopping slurry high temperature, pressure or chemical reaction the effects of under, with mechanical heap
Packing wall, packing wall mechanical strength with higher and toughness are set up in product mode or the heap for generating chemical consolidation object, lower
Permeability, and have firm adhesion strength with leakage channel wall, can effectively block drop ply.
4, after conserving for 24 hours in 80 DEG C of water-baths, it is greater than 30MPa with the compression strength that strength testing device is tested.
5, there is multiple bearing capacity.
6, flexural strength is greater than 20MPa.
High bearing strength sealing agent of the present invention can increase substantially resistance to compression and the flexural strength of leak stopping slurry, have aobvious
The plugging effect of work.The sealing agent is suitable for severe mud losses caused by blocking transverse crack, broken rock, and covers shell of compression more
The closure of the long open hole section of system improves the shock resistance crushing energy of the Behavior of Hardened Cement Paste of sealing agent and leakage channel wall bonding capacity and formation
Power.It is able to solve the high-intensitive blocking construction requirement of long open hole section, 30MPa or more.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated.But the present invention is not restricted by the embodiments.
Raw materials used in embodiment is commercially available.
Embodiment 1
Take good 100 parts of oil-well cement of G grades of China, 0.5 part of lignin sulfonic acid dipersant (GMP-3 Chrome-free diluent), 1.2 parts
1 part of polyvinyl alcohol fluid loss agent (the impermeable fluid loss agent of FSAM), calcium aluminosulfated type cement swelling agent (DZP lattice dilatation
Agent), it is uniformly mixed (dry-mixed).
44 parts of water are added in the slurry cup of M3080 constant speed stirring instrument, 2000 turns/min be added with stirring 2 parts of partial sizes 30~
Silica and 0.001 part of organic silicon defoamer silicone oil between 60nm.
In the slurry cup that dry-blend is rapidly joined to constant speed stirring instrument, (12000 turns/min) of high speed are stirred 50 seconds.It is straight by 3 parts
The steel wire that diameter range is between 0.1~1mm, length range is between 5~30mm is added in above-mentioned prepared cement slurry, low
Speed stirring 20 seconds, is made high bearing strength sealing agent of the invention.
This sealing agent is poured into the spill maintenance groove of stainless steel cubic type, is conserved for 24 hours in 80 DEG C of water-baths.Test side
Method is SY/T 6466-2016 hardened oilwell cement method for testing performance.Sample module is taken out, measures compression strength with strength testing device.The
Pressure-bearing 92.4kN, conversion compression strength are 35.5MPa.
Embodiment 2
Take good 100 parts of oil-well cement of G grades of China, 0.5 part of lignin sulfonic acid dipersant (FCLS), 1.2 parts of polyvinyl alcohols
(RC800) fluid loss agent, 1 part of calcium aluminosulfated type cement swelling agent (DZP lattice dilatation agent) are uniformly mixed (dry-mixed).
44 parts of water are added in the slurry cup of M3080 constant speed stirring instrument, 2000 turns/min is added with stirring 1 part of particle size range and exists
Silica and 0.001 part of organic silicon defoamer methyl-silicone oil between 30~60nm.Dry-blend is rapidly joined constant speed to stir
It mixes in the slurry cup of instrument, (12000 turns/min) of high speed are stirred 50 seconds.By 5 parts of diameter ranges between 0.1~1mm, length range exists
Steel wire between 5~30mm is added in above-mentioned prepared cement slurry, is stirred at low speed 20 seconds, and the high pressure-bearing for being made of the invention is strong
Spend sealing agent.
This sealing agent is squeezed into the crack of core block, is conserved for 24 hours in 80 DEG C of water-baths.Core is taken out, in pressure experiment
The bearing capacity that core is tested on machine is 37.4kN.
Embodiment 3
Good 100 parts of oil-well cement of G grades of China, 1 part of lignin sulfonic acid dipersant (FCLS), 2 parts of polyvinyl alcohol drops are taken to lose
Aqua polyvinyl alcohol (RC800) fluid loss agent, 1.5 parts of calcium aluminosulfated type cement swelling agent (DZP lattice dilatation agent), mixing are equal
It is even (dry-mixed).
44 parts of water are added in the slurry cup of M3080 constant speed stirring instrument, 2000 turns/min be added with stirring 2 parts of partial sizes 30~
Nano silica and 0.002 part of organic silicon defoamer methyl-silicone oil between 60nm.Dry-blend is rapidly joined constant speed to stir
It mixes in the slurry cup of instrument, 12000 turns/min of high speed is stirred 50 seconds.By 3 parts of diameters between 0.1~1mm, length 5~30mm it
Between fine steel wire be added in above-mentioned prepared cement slurry, stir at low speed 20 seconds, it is stifled that high bearing strength of the invention be made
Leakage agent 2.
This sealing agent is poured into maintenance groove, is conserved for 24 hours in 80 DEG C of water-baths.Sample module is taken out, is measured with strength testing device
Compression strength.First time pressure-bearing 90.2kN, conversion compression strength are 34.7MPa.
Embodiment 4
Take good 100 parts of oil-well cement of G grades of China, 0.5 part of lignin sulfonic acid dipersant (FCLS), 2 parts of polyvinyl alcohol drops
Dehydration agent (RC800), 1.5 parts of calcium aluminosulfated type cement swelling agent (DZP lattice dilatation agent) are uniformly mixed (dry-mixed).
44 parts of tap water are added in the slurry cup of M3080 constant speed stirring instrument, 2000 turns/min is added with stirring 1 part of partial size model
The silica being trapped among between 30~60nm and 0.001 part of organic silicon defoamer methyl-silicone oil.Dry-blend is rapidly joined into perseverance
In the slurry cup of speed stirring instrument, (12000 turns/min) of high speed are stirred 50 seconds.By 5 parts of diameter ranges between 0.1~1mm, length model
The steel wire being trapped among between 5~30mm is added in above-mentioned prepared cement slurry, and 2000 turns/min, which is stirred evenly, about to be needed 20 seconds, system
Obtain of the invention high bearing strength sealing agent 4.
This sealing agent is poured into maintenance groove, is conserved for 24 hours in 80 DEG C of water-baths.Sample module is taken out, is measured with strength testing device
Compression strength.First time pressure-bearing 92.4kN, conversion compression strength are 35.5MPa.
Embodiment 5
Take good 100 parts of oil-well cement of G grades of China, 0.5 part of lignin sulfonic acid dipersant (FCLS), 2 parts of polyvinyl alcohol drops
Dehydration agent (RC800), 1.5 parts of calcium aluminosulfated type cement swelling agent (DZP lattice dilatation agent) are uniformly mixed (dry-mixed).
44 parts of water are added in the slurry cup of M3080 constant speed stirring instrument, 2000 turns/min (are added with stirring 1 part of particle size range
Silica and 0.002 part of organic silicon defoamer methyl-silicone oil between 30~60nm.Dry-blend is rapidly joined into constant speed
In the slurry cup for stirring instrument, (12000 turns/min) of high speed are stirred 50 seconds.By 1 part of diameter range between 0.1~1mm, length range
Steel wire between 5~30mm is added in above-mentioned prepared cement slurry, and stirring at low speed about needs 20 seconds.Sealing agent is made
No. 6.
This sealing agent is poured into maintenance groove, is conserved for 24 hours in 80 DEG C of water-baths.Sample module is taken out, is measured with strength testing device
Compression strength.First time pressure-bearing 38.4kN, conversion compression strength are 23.0MPa.
Comparative example 1
By the LD-1 portland cement sealing agent generally used (the portland cement sealing agent ratio of mud be 0.4, i.e., 0.4 part
Water, 1 part of cement sealing agent) and G grades of silicate oil well leak stopping with cement as a comparison case.By the portland cement of general category
0.4 ratio of mud prepares sealing agent, that is, takes 1 part of normal silicate oil-well cement, and 0.4 part of water is uniformly mixed.When specific operation, may be used
It adds water in the slurry cup of M3080 constant speed stirring instrument, is stirred with the speed of 2000 turns/min, portland cement is rapidly joined into perseverance
Speed stirring instrument slurry cup in, high speed (12000 turns/min) stir 50 seconds, then stir at low speed 20 seconds to get.
Performance test
Test method is that SY/T 5840-2007 drilling fluid bridges plugging material Experimental Method in Laboratory (result such as following table
1)；SY/T 6466-2016 hardened oilwell cement method for testing performance (result such as the following table 2).
Table 1 blocks core experiment
Experiment condition: leak stopping slurry is poured into the crack that formation core is pressed into, is conserved for 24 hours in 80 DEG C of water-baths.
2 bearing capacity of table and toughness test
Note: LD-1 cement sealing agent is a kind of consolidation class sealing agent of Liaohe Oil Field production in table.
Pressure in table 2, which refers to, presses to splitting to rock core or module with pressure testing machine, the maximum pressure that press machine is shown
Numerical value, that is, rock core or the maximum of module bear pressure.First time intensity refers to that the module maintained into for the first time to leak stopping slurry presses
When, the intensity that the maximum pressure-bearing value of module is converted into, second of intensity and third time intensity are respectively referred to repeat and be operated for the first time
When, intensity that the maximum pressure-bearing value for the module that press machine is shown is converted into.
Lost Circulation Material with High Strength of the invention can repeatedly press on test pressure machine as can be seen from Table 2, until pressure
At pie.The existing fibre cement sealing agent of compressive strength rate is 3~9 times high, has multiple bearing strength, even if in the item of pressure break
Can still have the intensity of 20MPa or more under part, and intensity when comparative example sealing agent pressure break be zero (that is: after a pressure break, then
Repeat to press to crackled module, press machine no longer shows that it has bearing capacity), with LD-1 comparison can be seen that it is anti-
Compressive Strength improves 2.5 times, and strength decrease is slower, and Lost Circulation Material with High Strength of the invention has better anti-pressure ability and tough
Property.
Claims (10)
1. a kind of high bearing strength sealing agent of deep drilling well, it is characterised in that include cement, cement additive, nano-filled material
Material, microfibre material and water；The cement additive includes dispersing agent, fluid loss agent, swelling agent, defoaming agent；Wherein with water
Mud is 100 parts by weight meters, and dosage of each component is as follows:
2. a kind of high bearing strength sealing agent of deep drilling well according to claim 1, it is characterised in that with cement for 100 weights
Number meter is measured, dosage of each component is as follows:
3. a kind of high bearing strength sealing agent of deep drilling well according to claim 1 or 2, it is characterised in that:
The nano-composite material is nano silica of the particle size range in 10~80nm, nanometer calcium carbonate superfine powder, nano oxygen
Change aluminium, nano zine oxide, at least one of nano-titanium oxide.
4. a kind of high bearing strength sealing agent of deep drilling well according to claim 1 or 2, it is characterised in that:
The microfibre material be selected from length range 5~30mm, diameter range 0.1~1mm metal fiber wire.
5. a kind of high bearing strength sealing agent of deep drilling well according to claim 1 or 2, it is characterised in that:
The dispersing agent is in lignosulfonates system dispersing agent, naphthalenesulfonate dispersing agent, sulfonated acetone formaldehyde polycondensate
At least one.
6. a kind of high bearing strength sealing agent of deep drilling well according to claim 1 or 2, it is characterised in that:
The fluid loss agent is in polyvinyl alcohol, hydroxyethyl cellulose class, carboxymethyl cellulose and latex class fluid loss agent
At least one.
7. a kind of high bearing strength sealing agent of deep drilling well according to claim 1 or 2, it is characterised in that:
The swelling agent is metal-oxide expansive agent for cement slurry；The metal-oxide expansive agent for cement slurry be selected from calcium oxide,
Magnesia, calcium sulphoaluminate type swelling agent.
8. a kind of high bearing strength sealing agent of deep drilling well according to claim 1 or 2, it is characterised in that:
The defoaming agent is selected from least one of tbp class, organic silicon, silicone condensation species defoaming agent, preferably phosphorus
At least one of sour tri butyl ester class and organic silicon defoaming agent.
9. described in any item a kind of preparation methods of the high bearing strength sealing agent of deep drilling well according to claim 1~8,
Be characterized in that the following steps are included:
Component including cement, nano-composite material, microfibre material, cement additive and water is uniformly mixed, i.e.,
?.
10. a kind of preparation method of the high bearing strength sealing agent of deep drilling well according to claim 9, it is characterised in that packet
Include following steps:
(1) flour in the cement and cement additive is sufficiently mixed, solid mixture is made；
(2) liquid substance in the nano-composite material and the cement additive is added in the water, stirs at low speed
To being uniformly mixed, liquid mixture is made；
(3) solid mixture made from step (1) is added in step (2) in liquid mixture obtained, high-speed stirred is extremely
It is uniformly mixed, cement slurry is made；
(4) the microfibre material is added in cement slurry made from step (3), is stirred at low speed to uniformly mixed.
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| CN110903815A (en) * | 2019-12-20 | 2020-03-24 | 东营泰尔石油技术有限公司 | High-strength leakage-stopping slurry |
| CN111072328A (en) * | 2019-12-30 | 2020-04-28 | 中国海洋石油集团有限公司 | Oil well micro-crack self-healing material and preparation method thereof |
| CN112760084A (en) * | 2019-10-21 | 2021-05-07 | 中石化石油工程技术服务有限公司 | Plugging agent for oil-based drilling fluid and preparation method and application thereof |
| CN113845334A (en) * | 2020-06-28 | 2021-12-28 | 中国石油化工股份有限公司 | Deep well broken formation borehole reinforcing agent and preparation method and application thereof |
| CN114455895A (en) * | 2022-02-25 | 2022-05-10 | 辽宁昆成实业有限公司 | Three-body cement slurry for repairing operation heavy oil well tail pipe |
| CN114517080A (en) * | 2022-03-28 | 2022-05-20 | 中海石油(中国)有限公司 | Liquid drilling plugging material and preparation method thereof |
| CN114689825A (en) * | 2020-12-25 | 2022-07-01 | 中国石油化工股份有限公司 | Evaluation method for associated polymer modified cement slurry leakage stoppage |
| CN116291307A (en) * | 2023-05-12 | 2023-06-23 | 中国石油大学(华东) | Oil-gas well double-liquid method plugging method |
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| CN114455895A (en) * | 2022-02-25 | 2022-05-10 | 辽宁昆成实业有限公司 | Three-body cement slurry for repairing operation heavy oil well tail pipe |
| CN114517080A (en) * | 2022-03-28 | 2022-05-20 | 中海石油(中国)有限公司 | Liquid drilling plugging material and preparation method thereof |
| CN116291307A (en) * | 2023-05-12 | 2023-06-23 | 中国石油大学(华东) | Oil-gas well double-liquid method plugging method |
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