CN112832701A - Special environment-friendly fluid loss agent for geological drilling and preparation and use methods thereof - Google Patents
Special environment-friendly fluid loss agent for geological drilling and preparation and use methods thereof Download PDFInfo
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- CN112832701A CN112832701A CN202011597926.5A CN202011597926A CN112832701A CN 112832701 A CN112832701 A CN 112832701A CN 202011597926 A CN202011597926 A CN 202011597926A CN 112832701 A CN112832701 A CN 112832701A
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- fluid loss
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- geological drilling
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/032—Inorganic additives
-
- 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
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/062—Arrangements for treating drilling fluids outside the borehole by mixing components
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
Abstract
The invention discloses an environment-friendly fluid loss agent special for geological drilling and a preparation method and a use method thereof, wherein the environment-friendly fluid loss agent comprises the following components in percentage by mass: 20-40% of modified starch, 20-40% of hydrolyzed ammonium salt, 20% of silicate, 15% of plugging agent and 5% of graphite powder. The water loss agent has special requirements on the environmental protection performance of a slurry system aiming at geological drilling in a plateau ecological sensitive area, and has the remarkable filtration performance requirements on the basis of meeting the requirement of good environmental protection performance of the water loss agent in small-caliber geological drilling slurry in a complex stratum, and a plurality of environment-friendly materials form a multifunctional novel high-efficiency environment-friendly water loss agent sample which mainly takes filtration reduction and has the functions of inhibiting collapse prevention, lubricating resistance reduction and fracture plugging, so that the geological drilling work and the green environmental protection of the slurry system are realized.
Description
Technical Field
The invention relates to the technical field of fluid loss agents, in particular to an environment-friendly fluid loss agent special for geological drilling and a preparation method and a use method thereof.
Background
The fluid loss agent plays an important role in a geological drilling mud system, if the fluid loss agent has better fluid loss reduction performance, the fluid loss agent can prevent the hydration and the peeling of soft shale and hard brittle shale, and plays a role in stabilizing the hole wall, and the fluid loss agent reduces the water loss amount of the mud system by forming a low-permeability, flexible, thin and compact mud cake on the hole wall, so that the stability of the hole wall is ensured.
Geological drilling work is carried out in complex stratums and ecological sensitive areas of key mining areas in plateau areas, and a mud system needs to have green and environment-friendly performance while having good wall protection and collapse prevention performance, so that the fluid loss agent is required to have the following characteristics: the prepared slurry has the advantages of light color, no toxicity (no biological toxicity or chemical toxicity), easy biodegradation, small environmental damage, excellent and stable performance and convenient maintenance. The wall protection performance is good, the water loss is low, a thin and compact mud cake can be formed, and the water loss is obviously reduced while a certain hydration dispersion inhibiting capacity is also provided. From the characteristics and application effects of the conventional fluid loss agent material for preparing geological drilling mud, the polymer acrylic fluid loss agent has a remarkable fluid loss reducing effect at a low addition amount, but the quality of the formed mud cake is poor. The humic acid, sulfonated resin and asphalt fluid loss reducer can effectively reduce the water loss and obviously improve the quality of mud cakes in the mud, but has the problems of large addition, difficult degradation, environmental pollution and the like.
Disclosure of Invention
Aiming at the special requirement of geological drilling in a plateau ecological sensitive area on the environmental protection performance of a slurry system, on the basis of meeting the requirement of good environmental protection performance of a fluid loss agent in small-caliber geological drilling slurry in a complex stratum, the fluid loss agent simultaneously has the obvious fluid loss performance requirement, and by the principle and the idea that raw materials are environment-friendly, low in price, stable in rheological property and good in fluid loss effect, a multifunctional novel high-efficiency fluid loss agent sample which is suitable for the small-caliber geological drilling of a coal system complex stratum in an ecological sensitive area in a plateau area and mainly comprises various environmental protection materials, takes fluid loss reduction as a main part and has the functions of inhibiting collapse, lubricating and reducing drag and plugging cracks is developed by utilizing the environmental protection performance superiority of starch and acrylic polymer materials, so that the environment-friendly geological drilling work and the environment protection of the slurry system are realized.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
the environment-friendly fluid loss additive special for geological drilling comprises the following components in percentage by mass: 20-40% of modified starch, 20-40% of hydrolyzed ammonium salt, 20% of silicate, 15% of plugging agent and 5% of graphite powder.
Further, the environment-friendly fluid loss agent is composed of the following components in percentage by mass: 30% of modified starch, 30% of hydrolyzed ammonium salt, 20% of silicate, 15% of plugging agent and 5% of graphite powder.
Further, the modified starch is one or two of plant potato modified starch or plant corn modified starch.
Further, the hydrolyzed ammonium salt is one or two of hydrolyzed ammonium polyacrylate salt or hydrolyzed sodium polyacrylate salt.
Further, the silicate is one or two of potassium silicate powder or sodium silicate powder.
Further, the plugging agent is one or two of an anti-collapse while-drilling plugging agent or plant rubber powder.
The preparation method of the special environment-friendly fluid loss agent for geological drilling comprises the following steps of selecting raw materials according to the mass percentage.
S1, filling modified starch into a horizontal coulter mixer;
s2, adding hydrolyzed ammonium salt into the modified starch, fully stirring and uniformly mixing;
s3, adding silicate and a plugging agent into the uniformly mixed mixture, and fully stirring and mixing;
and S4, adding graphite powder into the mixture obtained in the step 3, and fully stirring and mixing to finish the preparation.
Further, the mixing time in the step S2 is 10-15 min; the mixing time in the step S3 is 10-12 min; the mixing time in the step S4 is 20-25 min.
A use method of an environment-friendly fluid loss agent special for geological drilling,
the fluid loss agent is added into the slurry system basic slurry which is completely hydrated and soaked, and the slurry system is mixed and stirred, so that the slurry system can meet the environmental protection requirement and has certain anti-collapse and wall protection performance; the fluid loss agent accounts for 7-10% of the mass of the basic slurry of the slurry system.
Further, adding the environment-friendly fluid loss additive into the slurry system basic slurry, and mixing and stirring for 10-20 min.
Compared with the prior art, the invention has the following beneficial effects:
1. after the environment-friendly fluid loss additive special for geological drilling provided by the invention is added into a slurry system, the influence on the rheological property and the fluid loss property of the slurry is small, and the problem of continuous tackifying of starch fluid loss additives in the slurry system is better solved.
2. The environment-friendly fluid loss additive special for geological drilling provided by the invention has no solid-liquid layering phenomenon in a slurry system after being added into the slurry system, and shows that the preferable raw materials have good compatibility and fluidity, the slurry system has low water loss and good filtration performance, and the quality of a mud cake can be better improved.
3. The environment-friendly fluid loss agent special for geological drilling provided by the invention has the advantages that the composition raw materials have good fluid loss performance, the source of the composition raw materials is wide, the performance is stable, and the environment-friendly fluid loss agent is environment-friendly and nontoxic.
4. The invention provides an environment-friendly fluid loss agent special for geological drilling, which is prepared from inorganic salts with good anti-collapse and anti-shrinkage effects as an anti-collapse raw material, shale and inert substances with obvious plugging effects on microcracks of a loose layer as plugging raw materials, and artificial graphite powder as a lubricating and anti-drag raw material, and has the advantages of wide source of the raw materials, stable performance, environmental protection and no toxicity.
5. The environment-friendly fluid loss agent special for geological drilling provided by the invention is simple in preparation method, easy in raw material purchase, low in price, convenient to use, convenient for large-scale production and good in market popularization and application value.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below:
the first embodiment is as follows:
the environment-friendly fluid loss agent special for geological drilling and the preparation and use methods thereof are disclosed, and the environment-friendly fluid loss agent is composed of the following components by mass percent: 20% of modified starch, 40% of hydrolyzed ammonium salt, 20% of silicate, 15% of plugging agent and 5% of graphite powder. The modified starch is plant potato modified starch and plant corn modified starch. The hydrolyzed ammonium salt is hydrolyzed polyacrylonitrile ammonium salt. The silicate is potassium silicate powder. The plugging agent is an anti-collapse plugging agent while drilling and plant rubber powder.
The preparation method of the special environment-friendly fluid loss agent for geological drilling comprises the following steps of selecting raw materials according to the mass percentage.
S1, filling modified starch into a horizontal coulter mixer;
s2, adding hydrolyzed ammonium salt into the modified starch, fully stirring and uniformly mixing;
s3, adding silicate and a plugging agent into the uniformly mixed mixture, and fully stirring and mixing;
and S4, adding graphite powder into the mixture obtained in the step 3, and fully stirring and mixing to finish the preparation.
Further, the mixing time in the step S2 is 10 min; the mixing time in the step S3 is 10 min; the mixing time in step S4 is 20 min.
A use method of an environment-friendly fluid loss agent special for geological drilling comprises the following steps:
the fluid loss agent is added into the slurry system basic slurry which is completely hydrated and soaked, and the slurry system is mixed and stirred, so that the slurry system can meet the environmental protection requirement and has certain anti-collapse and wall protection performance; the fluid loss agent accounts for 7% of the mass of the basic slurry of the slurry system. Adding the environment-friendly fluid loss additive into the slurry system basic slurry, and mixing and stirring for 10 min.
Example two:
the environment-friendly fluid loss agent special for geological drilling and the preparation and use methods thereof are disclosed, and the environment-friendly fluid loss agent is composed of the following components by mass percent: 30% of modified starch, 30% of hydrolyzed ammonium salt, 20% of silicate, 15% of plugging agent and 5% of graphite powder. The modified starch is plant potato modified starch. The hydrolyzed ammonium salt is hydrolyzed ammonium polyacrylate salt and hydrolyzed sodium polyacrylate salt. The silicate is sodium silicate powder. The plugging agent is an anti-collapse while-drilling plugging agent.
The preparation method of the special environment-friendly fluid loss agent for geological drilling comprises the following steps of selecting raw materials according to the mass percentage.
S1, filling modified starch into a horizontal coulter mixer;
s2, adding hydrolyzed ammonium salt into the modified starch, fully stirring and uniformly mixing;
s3, adding silicate and a plugging agent into the uniformly mixed mixture, and fully stirring and mixing;
and S4, adding graphite powder into the mixture obtained in the step 3, and fully stirring and mixing to finish the preparation.
Further, the mixing time in the step S2 is 15 min; the mixing time in the step S3 is 12 min; the mixing time in step S4 is 25 min.
A use method of an environment-friendly fluid loss agent special for geological drilling,
the fluid loss agent is added into the slurry system basic slurry which is completely hydrated and soaked, and the slurry system is mixed and stirred, so that the slurry system can meet the environmental protection requirement and has certain anti-collapse and wall protection performance; the fluid loss agent accounts for 10% of the mass of the basic slurry of the slurry system.
Further, the environment-friendly fluid loss additive is added into the slurry system basic slurry, and the mixing and stirring time is 20 min.
Example three:
the environment-friendly fluid loss agent special for geological drilling and the preparation and use methods thereof are disclosed, and the environment-friendly fluid loss agent is composed of the following components by mass percent: 40% of modified starch, 20% of hydrolyzed ammonium salt, 20% of silicate, 15% of plugging agent and 5% of graphite powder.
Further, the modified starch is plant corn modified starch.
Further, the hydrolyzed ammonium salt is hydrolyzed polyacrylonitrile sodium salt.
Further, the silicate is potassium silicate powder and sodium silicate powder.
Further, the blocking agent is plant rubber powder.
The preparation method of the special environment-friendly fluid loss agent for geological drilling comprises the following steps of selecting raw materials according to the mass percentage.
S1, filling modified starch into a horizontal coulter mixer;
s2, adding hydrolyzed ammonium salt into the modified starch, fully stirring and uniformly mixing;
s3, adding silicate and a plugging agent into the uniformly mixed mixture, and fully stirring and mixing;
and S4, adding graphite powder into the mixture obtained in the step 3, and fully stirring and mixing to finish the preparation.
Further, the mixing time in the step S2 is 12 min; the mixing time in the step S3 is 11 min; the mixing time in step S4 is 22 min.
A use method of an environment-friendly fluid loss agent special for geological drilling,
the fluid loss agent is added into the slurry system basic slurry which is completely hydrated and soaked, and the slurry system is mixed and stirred, so that the slurry system can meet the environmental protection requirement and has certain anti-collapse and wall protection performance; the fluid loss agent accounts for 8% of the mass of the basic slurry of the slurry system.
Further, the environment-friendly fluid loss additive is added into the slurry system basic slurry, and the mixing and stirring time is 15 min.
1 samples were prepared according to the component formulations in examples 1-3, 4% nano bentonite slurry was prepared at room temperature, and 3 samples of fluid loss additive prepared indoors were subjected to conventional performance test analysis and evaluation, respectively, with the results shown in table 1.
1# formulation: 4 percent of sodium bentonite slurry
And 2# formula: 4% of nano bentonite slurry + 1% of sample No. 1% (example one);
and 3# formula: 4% of nano bentonite slurry + 1% of sample No. (example two);
and 4, formulation: 4% of nano bentonite slurry + 1% of sample No. (example three);
TABLE 1 product ratio relation experiment data sheet
The experimental results are as follows: as can be seen from Table 1, with the increasing of the dosage of the main raw material A, the apparent viscosity, the plastic viscosity and the dynamic shear force in the solution are slightly improved, the water loss amount at normal temperature and normal pressure is gradually reduced, and the density and the PH value are not obviously changed, through observation after the 4 groups of solutions are kept stand for 24 hours, the phenomenon of solid-liquid stratification is not generated in a measuring cylinder added with the indoor prepared fluid loss agent sample, which indicates that the preferable raw materials have good compatibility and good fluidity, through careful comparison and analysis of various performance parameters of 3 groups of solutions after the 3 groups of samples are added, the various performance parameters of the 3# formula solution prepared by the fluid loss agent prepared by the two groups of distribution methods in the embodiment of the indoor design are considered to be superior to those of other 2 groups of performance, and the fluid loss agent is suitable for being used as an environment-friendly fluid loss agent for geological drilling.
2 evaluation of comprehensive Properties
The comprehensive performance evaluation of the environment-friendly fluid loss additive sample developed indoors comprises the comparison evaluation of fluid loss performance with similar products and the evaluation of the influence on the performance of a flushing liquid system, wherein the reference sample selects fluid loss materials such as hydrolyzed polypropylene sodium salt, hydrolyzed polypropylene ammonium salt, potassium humate, sulfonated asphalt and the like.
2.1 comparative evaluation of similar products
Under the condition of room temperature, 4% of nano bentonite slurry is prepared, a polymer fluid loss agent hydrolyzed polyacrylonitrile sodium salt, a hydrolyzed polyacrylonitrile ammonium salt, humic acid, asphalt fluid loss agent potassium humate, sulfonated asphalt and an environment-friendly fluid loss agent sample prepared according to the proportion in the second embodiment are respectively added, and performance parameters of the solution, such as density, water loss amount, pH value, colloid rate and the like, are respectively tested, and the experimental result is shown in table 2.
1# formulation: 4 percent of sodium bentonite slurry
And 2# formula: 4% of nano bentonite slurry and 1% of hydrolyzed polyacrylonitrile ammonium salt (NH4-HPAN)
And 3# formula: 4% of sodium bentonite slurry and 1% of hydrolyzed polyacrylonitrile sodium salt (Na-HPAN)
And 4, formulation: 4 percent of sodium bentonite slurry and 1 percent of environment-friendly fluid loss additive
And 5# formula: 4 percent of sodium bentonite slurry and 1 percent of potassium humate (KHm)
6# formulation: 4% of nano bentonite slurry and 1% of Sulfonated Asphalt (SAS)
Table 2 experimental data table for fluid loss properties
The experimental results are as follows: from table 2, it can be seen that 3 types of 5 water loss reducing products selected in the performance comparison experiment all have better filtration performance, although the water loss of the hydrolyzed polyacrylonitrile sodium salt and the hydrolyzed polyacrylonitrile ammonium salt in the washing fluid at normal temperature and normal pressure is controlled within 15ml/min30, the formed mud cakes are softer in quality, and the potassium humate and the sulfonated asphalt have good wall protection performance and smaller filtration loss in the washing fluid system, but have the problems of difficult degradation, environmental pollution and the like.
2.2 evaluation of Effect of flushing fluid Performance
In order to evaluate the influence of the environment-friendly fluid loss additive developed indoors on the rheological property and the fluid loss performance of the flushing fluid, a polymer flushing fluid is prepared at room temperature, 1%, 2% and 3% of fluid loss additive samples (prepared according to the two components in the example) are respectively added, and the parameters of the fluid loss additive such as density, the rheological property and the fluid loss are tested, and the experimental result is shown in table 3.
1# formulation: polymer rinse solution;
and 2# formula: polymer flushing fluid + 1% fluid loss additive sample;
and 3# formula: polymer flushing fluid + 2% fluid loss additive sample;
and 4, formulation: polymer flushing fluid + 3% fluid loss additive sample;
TABLE 3 washing liquid Performance influence experiment data sheet
The experimental results are as follows: as can be seen from Table 3, the viscosity and shear force of the polymer flushing fluid are changed slightly after the fluid loss reducer prepared by different adding amounts is added, the fluid loss is gradually reduced, and the formed mud cake is smooth and compact, so that the influence of the fluid loss reducer on the rheological property and the fluid loss of the flushing fluid is small, and the problem of tackifying the starch fluid loss reducing material in a flushing fluid system is solved.
3. Evaluation of environmental Properties
The environmental-friendly fluid loss additive sample (prepared according to two components in the embodiment) is tested by environmental-friendly performance evaluation biotoxicity analysis and petrochemical industry Shang Sheng Gong Industrial monitoring technology Limited company in biodegradability delegation, and a detection report is provided.
3.1 biotoxicity assay
The biological toxicity of the environment-friendly fluid loss agent sample is tested by adopting a luminescent bacteria method, the evaluation index is the luminescent bacteria EC50, and the higher the concentration EC50 value of the substance to be evaluated is when the luminous capacity of the luminescent bacteria is weakened by half, the lower the toxicity of the substance to be evaluated is.
TABLE 4 oil field chemical and drilling fluid biotoxicity grading Q/SY 111-
According to the national oil field chemical agent and drilling fluid biotoxicity classification Q/SY 111-2004 standard (Table 4), the biotoxicity test method is adopted to test the biotoxicity of the environment-friendly fluid loss additive, the test result is shown in Table 4, and the test result shows that: EC of environment-friendly fluid loss agent sample50Values greater than > 1X 106mg/L, reaching the direct discharge standard.
TABLE 4 biotoxicity assay data sheet
| Detecting content | Concentration% | EC50 mg/L | Toxicity grading |
| Environment-friendly fluid loss agent sample | 1％ | ＞1×106mg/L | Is non-toxic |
And (3) testing results: the environmental-friendly type fluid loss additive sample EC developed at this time50Values greater than > 1X 106mg/L, reaching the direct discharge standard.
3.2 biodegradability test
The biodegradability of the environmental-friendly fluid loss additive sample is evaluated by a BOD/COD ratio evaluation method commonly used in sewage treatment, the evaluation standard of the biodegradability is shown in table 5, and the detection data of the biodegradability is shown in table 6.
TABLE 5 evaluation criteria for biodegradability of wastewater treatment
TABLE 6 tables of biodegradability test data
And (3) testing results: BOD of the environment-friendly fluid loss additive sample developed this time5The biochemical oxygen demand is less than or equal to 300mg/L, the biodegradability is more than or equal to 0.05, and the biochemical oxygen demand and the biodegradability are all within the specified values of the national comprehensive sewage discharge standard, which shows that the environment-friendly fluid loss additive sample can be degraded by microorganisms and meets the requirement of environmental protection.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention by equivalent replacement or change according to the technical solution and the modified concept of the present invention within the technical scope of the present invention.
Claims (10)
1. The utility model provides a special environment-friendly fluid loss agent of geological drilling which characterized in that: the environment-friendly fluid loss agent comprises the following components in percentage by mass: 20-40% of modified starch, 20-40% of hydrolyzed ammonium salt, 20% of silicate, 15% of plugging agent and 5% of graphite powder.
2. The environment-friendly fluid loss additive for geological drilling as claimed in claim 1, wherein: the environment-friendly fluid loss agent comprises the following components in percentage by mass: 30% of modified starch, 30% of hydrolyzed ammonium salt, 20% of silicate, 15% of plugging agent and 5% of graphite powder.
3. The environment-friendly fluid loss additive for geological drilling as claimed in claim 1, wherein: the modified starch is one or two of plant potato modified starch or plant corn modified starch.
4. The environment-friendly fluid loss additive for geological drilling as claimed in claim 1, wherein: the hydrolyzed ammonium salt is one or two of hydrolyzed polyacrylonitrile ammonium salt or hydrolyzed polyacrylonitrile sodium salt.
5. The environment-friendly fluid loss additive for geological drilling as claimed in claim 1, wherein: the silicate is one or two of potassium silicate powder or sodium silicate powder.
6. The environment-friendly fluid loss additive for geological drilling as claimed in claim 1, wherein: the plugging agent is one or two of collapse-preventing while-drilling plugging agent or plant rubber powder.
7. The preparation method of the special environment-friendly fluid loss additive for geological drilling according to any one of claims 1-6, which is characterized by comprising the following steps: the raw materials are selected according to the mass percentage, and the preparation is carried out according to the following steps.
S1, filling modified starch into a horizontal coulter mixer;
s2, adding hydrolyzed ammonium salt into the modified starch, fully stirring and uniformly mixing;
s3, adding silicate and a plugging agent into the uniformly mixed mixture, and fully stirring and mixing;
and S4, adding graphite powder into the mixture obtained in the step 3, and fully stirring and mixing to finish the preparation.
8. The preparation method of the special environment-friendly fluid loss additive for geological drilling according to claim 7, which is characterized by comprising the following steps: the mixing time in the step S2 is 10-15 min; the mixing time in the step S3 is 10-12 min; the mixing time in the step S4 is 20-25 min.
9. The use method of the special environment-friendly fluid loss additive for geological drilling according to any one of claims 1-6, wherein the special environment-friendly fluid loss additive is characterized in that:
the fluid loss agent is added into the slurry system basic slurry which is completely hydrated and soaked, and the slurry system is mixed and stirred, so that the slurry system can meet the environmental protection requirement and has certain anti-collapse and wall protection performance; the fluid loss agent accounts for 7-10% of the mass of the basic slurry of the slurry system.
10. The use method of the special environment-friendly fluid loss additive for geological drilling according to claim 9, characterized by comprising the following steps: adding the environment-friendly fluid loss additive into the slurry system basic slurry, and mixing and stirring for 10-20 min.
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Application publication date: 20210525 |