CN109294535A - The preparation method and dosing apparatus of foam drilling fluid for the exploitation of three gas naked eyes - Google Patents
The preparation method and dosing apparatus of foam drilling fluid for the exploitation of three gas naked eyes Download PDFInfo
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- CN109294535A CN109294535A CN201811368552.2A CN201811368552A CN109294535A CN 109294535 A CN109294535 A CN 109294535A CN 201811368552 A CN201811368552 A CN 201811368552A CN 109294535 A CN109294535 A CN 109294535A
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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
- C09K8/02—Well-drilling compositions
- C09K8/38—Gaseous or foamed well-drilling compositions
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
- C09K8/10—Cellulose or derivatives thereof
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Abstract
The present invention relates to the preparation methods and dosing apparatus of a kind of foam drilling fluid for the exploitation of three gas naked eyes, wherein, preparation method includes the following steps: S1: preparing clear water, foam stabilizer, foaming agent and stabilizer, foam stabilizer includes carboxymethyl starch, carboxyethyl starch and carboxymethyl cellulose, and foaming agent includes neopelex, trimethyl second lactone and octadecyl alcolol；Carboxymethyl starch, carboxyethyl starch, carboxymethyl cellulose, neopelex, trimethyl second lactone and octadecyl alcolol mass ratio are as follows: (7~13): (7~13): (3~7): (3~5): (4~8): (0.5~2)；S2: clear water is added in slurry commanding tank；S3: foam stabilizer is added into slurry commanding tank；S4: foaming agent and stabilizer are added into slurry commanding tank.The preparation method enables the density of foam drilling fluid lower than 1.00g/cm3And density is adjustable, can take into account polymorphic type reservoir requirement, effectively improve system stability.
Description
Technical field
The present invention relates to drilling well production technique fields, and in particular to a kind of foam drilling fluid for the exploitation of three gas naked eyes
Preparation method and dosing apparatus.
Background technique
When the exploitation of three gas naked eyes refers to three kinds of Unconventional gas commingling productions such as sandstone gas, coal bed gas, shale gas, with naked
Eye completion mode realizes the mode of exploitation.It develops and uses as the non-conventional gas of representative using compact sandstone gas, shale gas, coal bed gas at present
For drilling fluid mainly based on polymer, inorganic salt drilling fluid, density is adjustable, but consistently greater than 1.00g/cm3, stored up in face of polymorphic type
Layer, drilling fluid density is excessive to be also easy to produce leakage, and a large amount of drilling fluids injure formation gas fluid ability after entering gas-bearing formation, obtain and do not repay
It loses.
It can be realized density lower than 1.00g/cm using foam, recyclable microvesicle as the drilling fluid of representative3, but density adjustment is tired
Difficulty in drilling process, requires density range different, cannot be considered in terms of polymorphic type reservoir requirement, and such in face of different type reservoir
Type system stability is poor, and using effect is bad, in addition, in the prior art, extemporaneous preparation drilling fluid needs large-scale air pump, resistance to height
Press hybrid system and high pressure resistant pipeline etc., equipment valuableness, complex process.
Therefore, it how to be configured to the foam drilling fluid of three gas naked eye production of water horizontal wells, convenient for preparing foam drilling at the scene
Well liquid simultaneously makes its density lower than 1.00g/cm3And it is adjustable, the requirement of polymorphic type reservoir can be taken into account, effectively improve system stability, be
Those skilled in the art's technical issues that need to address.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of foam drilling fluid for the exploitation of three gas naked eyes and with setting up
It is standby, enable the density of foam drilling fluid lower than 1.00g/cm3And density is adjustable, can take into account polymorphic type reservoir requirement, effectively
Improve system stability.
In order to solve the above technical problems, the present invention provides a kind of preparation side of foam drilling fluid for the exploitation of three gas naked eyes
Method comprising following steps:
Include the following steps:
S1: prepare clear water, inorganic agent and stabilizer respectively, wherein the inorganic agent includes foam stabilizer and foaming agent, described
Foam stabilizer includes carboxymethyl starch, carboxyethyl starch and carboxymethyl cellulose, the foaming agent include neopelex,
Trimethyl second lactone and octadecyl alcolol；
The carboxymethyl starch, the carboxyethyl starch, the carboxymethyl cellulose, the neopelex,
The mass ratio of the trimethyl second lactone and the octadecyl alcolol are as follows: (7~13): (7~13): (3~7): (3~5): (4~8):
(0.5~2)；
S2: the clear water is added in slurry commanding tank；
S3: the foam stabilizer is added in the slurry commanding tank into step S2, is persistently mixed and fed into step S4；
S4: the foaming agent and the stabilizer are added into the slurry commanding tank.
Foam drilling fluid includes clear water, inorganic agent and stabilizer, wherein inorganic agent includes foam stabilizer and foaming agent, foam stabilizing
Carboxymethyl starch in agent has the effect of good thickening after being dissolved in water, stablizes, water conservation, film forming, suspends, and user
Just, safety and environmental protection；Carboxyethyl starch play the role of separation inhibit, foaming agent in foaming process, carboxyethyl starch can
Stablize foaming process；The aqueous solution of carboxymethyl cellulose has thickening, the protection of film forming, gluing, water tariff collection, colloid, emulsification
And the effects of suspending, the foam drilling fluid containing carboxymethyl cellulose enable to the borehole wall to form the low filter of Bao Erjian, permeability
Cake reduces pollution of the foam drilling fluid to reservoir, reduces its influence to permeability.Above-mentioned three kinds of foam stabilizers are matched according to above-mentioned
Than, can make foam drilling fluid can density stabilized reduction during foaming agent foam, and foam knot after foaming agent foam can be improved
The stability of structure, so that being separated from each other between each bubble, bubble at this time is similar to balloon, and structural stability is good.
Neopelex in foaming agent has good surface living as a kind of anionic surfactant
Property, hydrophily is stronger, is used as air-entrainment；Trimethyl second lactone is common foaming agent；Octadecyl alcolol, emulsifiability is good, and above-mentioned three
Kind foaming agent can foam, so that inorganic agent resulting foam after being dissolved in clear water according to said ratio in water base environment
The density of the density ratio clear water of drilling fluid is low, that is, reaches 1.00g/cm3Effect below, simultaneously, it is ensured that foaming effect is in
Zone of reasonableness can satisfy the density requirement of bubble drilling fluid.
Particularly, the preparation of the foam drilling fluid is carried out in slurry commanding tank, is easy to implement extemporaneous preparation, is being prepared
In the process, whole that mixing arrangement is needed to carry out lasting hybrid manipulation to the liquid in slurry commanding tank.Into slurry commanding tank, addition is handled
When agent, need that foam stabilizer (carboxymethyl starch, carboxyethyl starch and carboxymethyl cellulose) slowly first is added, foam stabilizer is held after adding
Continuous mixing enables foam stabilizer to be adequately dissolved in clear water, provides a stable foaming ring for the foaming agent of subsequent addition
Border；Then foaming agent (neopelex, trimethyl second lactone, octadecyl alcolol) and stabilizer is slowly added, and continues
Water can be substantially soluble in and sufficiently foam by mixing to foaming agent, and foam can make each bubble mutually divide under the action of foam stabilizer
From and improve the stability of each bubble.Whole process need hybrid manipulation enable to foaming more completely, foam stability it is more preferable, in turn
Guarantee that the foam drilling fluid can play cooling effect, large rock-carrying ability with higher etc. to drill bit simultaneously.
Optionally, the clear water is scene water intaking, and the stabilizer is sodium bicarbonate.
Optionally, in step S1, the mass ratio of the clear water, the inorganic agent and the stabilizer is (700~1300):
(25~45): (0.5~2).
Optionally, further comprising the steps of after the step S4:
S5: whether the density and rheological characteristic index for detecting the foam drilling fluid in the slurry commanding tank reach respective target
Value；
If the density and rheological characteristic index reach respective target value, the preparation of the foam drilling fluid is completed；
If the density and rheological characteristic index are not up to respective target value, step S6 is carried out；
S6: if the density is higher than the target value, the rheological characteristic index is lower than the target value, then by step S1
Quality proportioning each inorganic agent is added into the slurry commanding tank；
If the density is lower than the target value, the rheological characteristic index is higher than the target value, then to the slurry commanding tank
It is interior that the clear water is added.
Optionally, the target value of the density is 0.75g/cm3~1.00g/cm3；The target value packet of the rheological characteristic index
It includes: apparent viscosity 15mPas~35mPas, plastic viscosity 8mPas~25mPas, yield value 10mPas~
25mPas and ratio of dynamic shear force/yield value to plastic viscosity 0.6Pa/ (mPas)~1.0Pa/ (mPas).
Optionally, in step S3, it includes that institute is sequentially added into the slurry commanding tank that foam stabilizer, which is added, into the slurry commanding tank
State carboxymethyl starch, the carboxyethyl starch and the carboxymethyl cellulose；In step S4, foaming is added into the slurry commanding tank
Agent includes that the neopelex, the trimethyl second lactone and described 18 are sequentially added into the slurry commanding tank
Alcohol.
Optionally, in step S3, after persistently mixing the first preset time after addition foam stabilizer, S4 is entered step；Step S4
In, the second preset time is persistently mixed after foaming agent is added.
Optionally, first preset time and second preset time are 20min~30min.
In addition, the present invention also provides a kind of dosing apparatus of foam drilling fluid for three gas naked eye production of water horizontal wells,
Preparation method based on foam drilling fluid as described above comprising slurry commanding tank and mixing arrangement, the mixing arrangement for pair
Liquid in the slurry commanding tank carries out hybrid manipulation.
The dosing apparatus of preparation method based on foam drilling fluid as described above, technical effect and above-mentioned preparation method
Technical effect it is similar, for save length, details are not described herein.
Optionally, the mixing arrangement is the agitating device in the slurry commanding tank；Or the mixing arrangement includes stream
Body pump and pipeline, the fluid pump are set to the outside of the slurry commanding tank, and the pipeline is connected to the slurry commanding tank, and forms circulation
Fluid circuit, the liquid in the circulation of fluid pipeline can recycle under the action of the fluid pump.
Optionally, the volume of the slurry commanding tank is not less than 10m3If the mixing arrangement is agitating device, mixing speed
Not less than 70r/min, if the mixing arrangement includes the fluid pump and the pipeline, the discharge capacity of the fluid pump is not less than
12m3/h。
Detailed description of the invention
Fig. 1 is the process provided by the embodiment of the present invention for the preparation method of the foam drilling fluid of three gas naked eyes exploitation
Block diagram；
Fig. 2 is provided by the embodiment of the present invention for the detailed of the preparation method of the foam drilling fluid of three gas naked eyes exploitation
Thin flow diagram；
Fig. 3 is the structure provided by the embodiment of the present invention for the dosing apparatus of the foam drilling fluid of three gas naked eyes exploitation
Schematic diagram；
Fig. 4 is provided by the embodiment of the present invention for the another of the dosing apparatus of the foam drilling fluid of three gas naked eyes exploitation
Kind structural schematic diagram.
In attached drawing 1-4, the reference numerals are as follows:
1- slurry commanding tank；2- agitating device；31- pipeline, 32- fluid pump, 33- funnel, 4- feeding device.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to make those skilled in the art more fully understand technical solution of the present invention
Applying example, the present invention is described in further detail.
Fig. 1-4 is please referred to, Fig. 1 is matching for the foam drilling fluid of three gas naked eyes exploitation provided by the embodiment of the present invention
The flow diagram of method processed；Fig. 2 is matching for the foam drilling fluid of three gas naked eyes exploitation provided by the embodiment of the present invention
The detailed process block diagram of method processed；Fig. 3 is the foam drilling fluid provided by the embodiment of the present invention for the exploitation of three gas naked eyes
The structural schematic diagram of dosing apparatus；Fig. 4 is the foam drilling fluid provided by the embodiment of the present invention for the exploitation of three gas naked eyes
Another structural schematic diagram of dosing apparatus.
The embodiment of the invention provides a kind of preparation method of foam drilling fluid for the exploitation of three gas naked eyes and with setting up
It is standby, wherein when the exploitation of three gas naked eyes refers to three kinds of Unconventional gas commingling productions such as sandstone gas, coal bed gas, shale gas, with naked
Eye completion mode realizes the mode of exploitation.
The preparation method of foam drilling fluid in the present embodiment includes the following steps:
S1: prepare clear water, inorganic agent and stabilizer respectively, wherein the inorganic agent includes foam stabilizer and foaming agent, described
Foam stabilizer includes carboxymethyl starch, carboxyethyl starch and carboxymethyl cellulose, the foaming agent include neopelex,
Trimethyl second lactone and octadecyl alcolol；
The carboxymethyl starch, the carboxyethyl starch, the carboxymethyl cellulose, the neopelex,
The mass ratio of the trimethyl second lactone and the octadecyl alcolol are as follows: (7~13): (7~13): (3~7): (3~5): (4~8):
(0.5~2)；
S2: above-mentioned clear water is added in slurry commanding tank 1；
S3: foam stabilizer is added in the slurry commanding tank 1 into step S2, is persistently mixed and fed into step S4；
S4: foaming agent and stabilizer are added into slurry commanding tank 1.
Correspondingly, the dosing apparatus based on above-mentioned preparation method in the present embodiment includes slurry commanding tank 1 and mixing arrangement,
In, mixing arrangement is used to carry out hybrid manipulation to the liquid in slurry commanding tank 1.
Foam drilling fluid includes clear water, inorganic agent and stabilizer, wherein inorganic agent includes foam stabilizer and foaming agent, foam stabilizing
Carboxymethyl starch in agent has the effect of good thickening after being dissolved in water, stablizes, water conservation, film forming, suspends, and user
Just, safety and environmental protection；Carboxyethyl starch play the role of separation inhibit, foaming agent in foaming process, carboxyethyl starch can
Stablize foaming process；The aqueous solution of carboxymethyl cellulose (CMC) have thickening, film forming, gluing, water tariff collection, colloid protect,
The effects of emulsification and suspension, the foam drilling fluid containing carboxymethyl cellulose (CMC) enable to the borehole wall to form Bao Erjian, infiltration
The low filter cake of property, reduces pollution of the foam drilling fluid to reservoir, reduces its influence to permeability.Above-mentioned three kinds of foam stabilizers are pressed
According to said ratio, can make foam drilling fluid can density stabilized reduction during foaming agent foam, and foaming agent foam can be improved
The stability of foaming structure afterwards, so that being separated from each other between each bubble, bubble at this time is similar to balloon, and structural stability is good.
Neopelex in foaming agent has good surface living as a kind of anionic surfactant
Property, hydrophily is stronger, is used as air-entrainment；Trimethyl second lactone is common foaming agent；Octadecyl alcolol, emulsifiability is good, and above-mentioned three
Kind foaming agent can foam, so that inorganic agent resulting foam after being dissolved in clear water according to said ratio in water base environment
The density of the density ratio clear water of drilling fluid is low, that is, reaches 1.00g/cm3Effect below, simultaneously, it is ensured that foaming effect is in
Zone of reasonableness can satisfy the density requirement of bubble drilling fluid.
Particularly, the preparation of the foam drilling fluid is carried out in slurry commanding tank 1, is easy to implement extemporaneous preparation, is being matched
During system, whole process needs mixing arrangement to carry out lasting hybrid manipulation to the liquid in slurry commanding tank 1.Into slurry commanding tank at addition
When managing agent, need that foam stabilizer (carboxymethyl starch, carboxyethyl starch and carboxymethyl cellulose) slowly first is added, after foam stabilizer adds
Lasting mixing enables foam stabilizer to be adequately dissolved in clear water, provides a stable foaming ring for the foaming agent of subsequent addition
Border；Then foaming agent (neopelex, trimethyl second lactone, octadecyl alcolol) and stabilizer is slowly added, and continues
Water can be substantially soluble in and sufficiently foam by mixing to foaming agent, and foam can make each bubble mutually divide under the action of foam stabilizer
From and improve the stability of each bubble.Whole process need hybrid manipulation enable to foaming more completely, foam stability it is more preferable, in turn
Guarantee that the foam drilling fluid can play cooling effect, large rock-carrying ability with higher etc. to drill bit simultaneously.
In above-mentioned foam drilling fluid, clear water is scene water intaking, and stabilizer is sodium bicarbonate, convenient and good economy performance of drawing materials.
Certainly, in the present embodiment, stabilizer can also select sodium carbonate, and sodium bicarbonate can ionize out hydrogen ion after being dissolved in water, make
Solution is in alkalescent, provides a kind of environment of suitable foaming for foaming agent.
In above-mentioned steps S1, the mass ratio of clear water, inorganic agent and stabilizer is (700~1300): (25~45): (0.5~
2).Guaranteeing can be closer to target value according to the density and rheological characteristic index of the step S1-S4 foam drilling fluid prepared.
Further, in step S1, carboxymethyl starch, carboxyethyl starch, carboxylic first in each component inorganic agent in inorganic agent
Base cellulose, neopelex, trimethyl second lactone and octadecyl alcolol mass ratio are as follows: (9.8~10.2): (9.8~
10.2): (4.8~5.2): (3.8~4.2): (5.8~6.2): (0.8~1.2).So that foam stabilizing effect and foaming effect are more preferable.
Meanwhile in step S1, the mass ratio of clear water, inorganic agent and stabilizer is (700~1300): (25~45): (0.5~2), is guaranteed
Meet target value according to the density and rheological characteristic index of the above-mentioned steps S1-S4 foam drilling fluid prepared, adjusting can be effectively reduced
Number.
In above-mentioned preparation method, after step S4 can with the following steps are included:
S5: whether the density and rheological characteristic index of the foam drilling fluid in detection slurry commanding tank 1 reach target value；
If density and rheological characteristic index reach target value, the preparation of foam drilling fluid is completed；
If density and rheological characteristic index miss the mark value, carry out step S6；
S6: if the density is higher than the target value, the rheological characteristic index is lower than the target value, then by step S1
Quality proportioning each inorganic agent is added into the slurry commanding tank 1；
If the density is lower than the target value, the rheological characteristic index is higher than the target value, then to the slurry commanding tank 1
It is interior that the clear water is added.
At this point, the density and rheological characteristic for detecting foam drilling fluid refer to correspondingly, dosing apparatus includes detection device
How mark specifically, not doing specific requirement for the setting of detection device, while passes through detection device detection foam drilling fluid
Density and rheological characteristic index, the prior art being well known to those skilled in the art, to save length, details are not described herein.
The above-mentioned preliminary foam drilling fluid prepared and (prepared by step S1-S4) is detected, not due to site environment
Together, different to the density of foam drilling fluid and rheological characteristic demand, the density and stream of the current foam drilling fluid of step S5 confirmation
Whether denaturation index reaches respective target value, and (i.e. density reaches density targets value, and rheological characteristic index reaches rheological characteristic index mesh
Scale value) with the demand of current working, the foam drilling fluid, which is prepared, if reaching respective target value completes, if not up to respective
Target value can be then adjusted until reaching respective target by density and rheological characteristic index of the step S6 to foam drilling fluid
Value.
The additional amount of clear water or each inorganic agent can be specifically adjusted for different demands.Foam is prepared in situ in exploitation
When drilling fluid, due to the difference of Reservoir type, difference is required to the density range of foam drilling fluid, it can be according to the specific operating condition in scene
The additional amount of clear water and inorganic agent is adjusted, the foam drilling fluid is enabled to be suitable for different types of reservoir, is applicable in
Property is good.
In the above-described embodiments, the target value of density is 0.75g/cm3~1.00g/cm3；The target value packet of rheological characteristic index
It includes: apparent viscosity 15mPas~35mPas, plastic viscosity 8mPas~25mPas, yield value 10mPas~
25mPas and ratio of dynamic shear force/yield value to plastic viscosity 0.6Pa/ (mPas)~1.0Pa/ (mPas).Density and rheological characteristic index reach above-mentioned target
The foam drilling fluid of value can satisfy the demand of different reservoir under normal circumstances.
In the above-described embodiments, as shown in Fig. 2, in step s3, it includes to slurry commanding tank that foam stabilizer, which is added, into slurry commanding tank
Inside sequentially add carboxymethyl starch, carboxyethyl starch and carboxymethyl cellulose；In step S4, foaming agent packet is added into slurry commanding tank
It includes and sequentially adds neopelex, trimethyl second lactone and octadecyl alcolol into slurry commanding tank.Limit a foam stabilizer and Ge Fa
The addition sequence of infusion, it is ensured that foaming effect is more stable.
In the above-described embodiments, as shown in Fig. 2, in step S3, after persistently mixing the first preset time after addition foam stabilizer,
Enter step S4；In step S4, the second preset time is persistently mixed after foaming agent is added.The setting of first preset time can guarantee
Foam stabilizer is substantially soluble in water, and a more stable foaming environment can be provided for the foaming of foaming agent, and second it is default when
Between setting can guarantee that each foaming agent can be substantially soluble in water, and can foam completely, guarantee foaming effect.
In the above-described embodiments, the first preset time and the second preset time are 20min~30min.Wherein, first is default
Between and the second preset time can be the same or different, be not particularly limited herein, mixing in 20min~30min behaviour
Make to can guarantee that foam stabilizer and foaming agent can be acted on sufficiently to improve foaming effect and stability.
Hybrid manipulation is not particularly limited in the present embodiment, in the present embodiment, which is stirring or recycle stream
Body effect.Correspondingly, the mixing arrangement of dosing apparatus is the agitating device in slurry commanding tank 1 when immixture is stirring
2, when immixture is that circulation of fluid acts on, mixing arrangement includes fluid pump 32 and pipeline 31, wherein.Fluid pump 32, which is set to, matches
The outside of tank 1 is starched, pipeline 31 is connected to slurry commanding tank 1 and is formed circulation of fluid circuit, and the liquid in circulation of fluid pipeline can flow
It is recycled under the action of body pump 32, that is to say, that fluid pump 32 is able to drive the liquid circulation in circulation of fluid circuit, to slurry
Liquid in tank 1 carries out hybrid manipulation.And in process for preparation, feeding device 4 can directly add to the top end opening of slurry commanding tank 1
Enter inorganic salts and clear water or feeding device 4 and is fed by being set to the funnel 33 of pipeline 31.
In addition, the volume of slurry commanding tank 1 is not less than 10m when extemporaneous preparation foam drilling fluid3, to meet site operation demand,
Meanwhile existing slurry commanding tank 1, without separately setting, good economy performance can be used directly.If hybrid manipulation is stirring, agitating device 2
Mixing speed is not less than 70r/min, if the hybrid manipulation is circulation of fluid effect, the discharge capacity of fluid pump 32 is not less than
12m3/ h adequately mixes the liquid in slurry commanding tank 1 with realizing.
Be below in the present embodiment by above-mentioned preparation method and dosing apparatus prepare foam drilling fluid during,
The variable density situation of foam drilling fluid after the additional amount of adjustment clear water or inorganic agent.
(1) foam drilling fluid is prepared, the additional proportion of foaming agent is adjusted by gradient, wherein the density of A point is each component
According to following mass ratio: clear water 1000, carboxymethyl starch 10, carboxyethyl starch 10, carboxymethyl cellulose 5, detergent alkylate sulphur
The density for the foam drilling fluid that sour sodium 4, trimethyl second lactone 6, octadecyl alcolol 1, sodium bicarbonate 1 are prepared, with 0.25,0.5,0.25
It is spaced the additional amount of the neopelex, trimethyl second lactone, octadecyl alcolol that are gradually increased in foaming agent, and is continuously recorded
B, C, D, E totally 4 points, concretely, the mass ratio of each component is in clear water 1000, carboxymethyl starch 10, carboxyethyl starch 10, carboxylic
On the basis of methylcellulose 5, sodium bicarbonate 1 are constant, the foaming agent of B point is neopelex 4.25, trimethyl second
Lactone 6.5, octadecyl alcolol 1.25；The foaming agent of C point is neopelex 4.5, trimethyl second lactone 7, octadecyl alcolol 1.5；D
The foaming agent of point is neopelex 4.75, trimethyl second lactone 7.5, octadecyl alcolol 1.75；The foaming agent of E point is 12
Sodium alkyl benzene sulfonate 5, trimethyl second lactone 8, octadecyl alcolol 2.
Measured respectively with density balance again B point, C point, D point, E point foam drilling fluid density, compare the foam drilling of 5 points
The Density Distribution of well liquid, is shown in Table 1.
The Density Distribution one of 1 foam drilling fluid of table
(2) foam drilling fluid is prepared, the additional amount of clear water is adjusted by gradient, on the basis of above-mentioned A point, between 50
Every the additional amount for gradually increasing clear water, to dilute the foam drilling fluid of A point, and continuously record F, G, H, J totally 4 points (clear water
Additional amount is followed successively by 1050,1100,1150,1200), then measure with density balance the foam drilling of F point, G point, H point, J point respectively
The density of liquid compares the Density Distribution for the foam drilling fluid that 5 are selected, is shown in Table 2.
The Density Distribution two of 2 foam drilling fluid of table
As can be seen that by adjusting Solid Free foam drilling fluid inorganic agent ratio, can be realized density 0.75~
1.00g/cm3Adjustment in range.Specifically, by above-mentioned table 1 as can be seen that increasing matching for the foaming agent in foam drilling fluid
Than the density of foam drilling fluid can be reduced；It, can by above-mentioned table 2 as can be seen that increasing the proportion of the clear water in foam drilling fluid
Increase the density of foam drilling fluid.Also, with the addition of foaming agent, the variable density of foam drilling fluid obtained is stablized, just
In control to obtain the foam drilling fluid with target density.
Due in the process for preparation of the foam drilling fluid, Solid Free material, so that infiltration of the foam drilling fluid to stratum
Rate influence it is smaller, can effective protection reservoir, will not influence the yield of three gas.
Be below in the present embodiment by above-mentioned preparation method and the prepared foam drilling fluid of dosing apparatus to difference
The test of rock core type (i.e. different reservoir) pollution level, wherein rock core type includes tight sand, coal seam and shale, examination
In testing, different rock core types is arranged to the plunger having a size of 38mm × 70mm.Reference national standard SY/T 5336-1996,
It is 2MPa, confining pressure 2.5MPa that pressure is driven in setting.Rock core gas original permeability and the present embodiment are measured with normal saline solution respectively
In foam drilling fluid pollution after gas permeability, and calculate pollution after resume permeability rate, the results are shown in Table 3.
Pollution level of 3 foam drilling fluid of table to different rock core types
As it can be seen that the three types core column such as foam drilling fluid pollution compactness sand rock and coal bed, shale provided by the present embodiment
After plug, plunger resume permeability rate is respectively 91.67%, 93.55%, 84.21%, and resume permeability effect is ideal, shows this
Foam drilling fluid is ideal in face of three types reservoir control leakage effect, lower to stratum pollution level.
The above is only the preferred embodiment of the present invention, it is noted that those skilled in the art are come
It says, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (11)
1. a kind of preparation method of the foam drilling fluid for the exploitation of three gas naked eyes, the foam drilling fluid includes clear water and processing
Agent, which comprises the steps of:
S1: prepare clear water, inorganic agent and stabilizer respectively, wherein the inorganic agent includes foam stabilizer and foaming agent, the foam stabilizing
Agent includes carboxymethyl starch, carboxyethyl starch and carboxymethyl cellulose, and the foaming agent includes neopelex, front three
Base second lactone and octadecyl alcolol；
It is the carboxymethyl starch, the carboxyethyl starch, the carboxymethyl cellulose, the neopelex, described
The mass ratio of trimethyl second lactone and the octadecyl alcolol are as follows: (7~13): (7~13): (3~7): (3~5): (4~8): (0.5
~2)；
S2: the clear water is added in slurry commanding tank；
S3: the foam stabilizer is added in the slurry commanding tank into step S2, is persistently mixed and fed into step S4；
S4: the foaming agent and the stabilizer are added into the slurry commanding tank.
2. the preparation method of foam drilling fluid according to claim 1, which is characterized in that the clear water is scene water intaking,
The stabilizer is sodium bicarbonate.
3. the preparation method of foam drilling fluid according to claim 2, which is characterized in that in step S1, the clear water, institute
The mass ratio for stating inorganic agent and the stabilizer is (700~1300): (25~45): (0.5~2).
4. the preparation method of foam drilling fluid according to claim 1-3, which is characterized in that in the step S4
It is further comprising the steps of afterwards:
S5: whether the density and rheological characteristic index for detecting the foam drilling fluid in the slurry commanding tank reach respective target value；
If the density and rheological characteristic index reach respective target value, the preparation of the foam drilling fluid is completed；
If the density and rheological characteristic index are not up to respective target value, step S6 is carried out；
S6: if the density is higher than the target value, the rheological characteristic index is lower than the target value, then by the matter in step S1
Each inorganic agent is added into the slurry commanding tank for amount proportion；
If the density is lower than the target value, the rheological characteristic index is higher than the target value, then adds into the slurry commanding tank
Enter the clear water.
5. the preparation method of foam drilling fluid according to claim 4, which is characterized in that
The target value of the density is 0.75g/cm3~1.00g/cm3；
The target value of the rheological characteristic index includes: apparent viscosity 15mPas~35mPas, and plastic viscosity 8mPas~
25mPas, yield value 10mPas~25mPas and ratio of dynamic shear force/yield value to plastic viscosity 0.6Pa/ (mPas)~1.0Pa/ (mPas).
6. the preparation method of foam drilling fluid according to claim 1-3, which is characterized in that in step S3, to
It includes that the carboxymethyl starch, the carboxyethyl starch are sequentially added into the slurry commanding tank that foam stabilizer is added in the slurry commanding tank
With the carboxymethyl cellulose；
In step S4, it includes that the detergent alkylate is sequentially added into the slurry commanding tank that foaming agent, which is added, into the slurry commanding tank
Sodium sulfonate, the trimethyl second lactone and the octadecyl alcolol.
7. the preparation method of foam drilling fluid according to claim 1-3, which is characterized in that in step S3, add
Enter after persistently mixing the first preset time after foam stabilizer, enters step S4；
In step S4, the second preset time is persistently mixed after foaming agent is added.
8. the preparation method of foam drilling fluid according to claim 7, which is characterized in that first preset time and institute
Stating the second preset time is 20min~30min.
9. a kind of dosing apparatus of the foam drilling fluid for three gas naked eye production of water horizontal wells, any based on such as claim 1-8
The preparation method of foam drilling fluid described in, which is characterized in that including slurry commanding tank (1) and mixing arrangement, the mixing arrangement
For carrying out hybrid manipulation to the liquid in the slurry commanding tank (1).
10. the dosing apparatus of foam drilling fluid according to claim 9, which is characterized in that
The mixing arrangement is the agitating device (2) in the slurry commanding tank (1)；
Or the mixing arrangement includes fluid pump (32) and pipeline (31), the fluid pump (32) is set to the slurry commanding tank (1)
Outside, the pipeline (31) is connected to the slurry commanding tank (1), and forms circulation of fluid pipeline, in the circulation of fluid pipeline
Liquid can recycle under the action of the fluid pump (32).
11. the preparation method of foam drilling fluid according to claim 10, which is characterized in that the volume of the slurry commanding tank is not
Less than 10m3If the mixing arrangement is agitating device (2), mixing speed is not less than 70r/min, if the mixing arrangement packet
The fluid pump (32) and the pipeline (31) are included, then the discharge capacity of the fluid pump (32) is not less than 12m3/h。
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Inventor after: Meng Shangzhi Inventor after: Wei Panfeng Inventor after: Yang Gang Inventor after: Zheng Lihui Inventor after: Ma Tengfei Inventor after: Lin Liang Inventor after: Zhang Linqiang Inventor after: Zhao Wei Inventor after: Wu Jian Inventor after: Chen Xiaobo Inventor before: Meng Shangzhi Inventor before: Yang Gang Inventor before: Zheng Lihui Inventor before: Ma Tengfei Inventor before: Lin Liang Inventor before: Zhang Linqiang Inventor before: Chen Xiaobo Inventor before: Wei Panfeng |