CN112111256B - Experimental slurry for evaluating weighting material - Google Patents
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Abstract
A test slurry for evaluating a weight material. The experimental slurry for analyzing the weighting material in the drilling fluid comprises the following components in parts by weight: 900-1200 parts of weighting material, 4-15 parts of bentonite, 300-400 parts of water, 4-10 parts of tackifier, 4-10 parts of filtrate reducer and 1-2 parts of alkalizer. The influence of the weighting material on the rheological property and the fluid loss wall-forming property in the experimental slurry can be inferred. The influence of the weighting material on the comprehensive performance of the high-density drilling fluid can be judged more conveniently and accurately.
Description
Technical Field
The invention relates to but is not limited to the field of oil and gas exploitation, in particular but not limited to an experimental slurry for evaluating a weighting material.
Background
With the continuous exploration and development of petroleum resources, oil and gas drilling gradually turns to deep stratum, so that the probability of drilling a high-temperature high-pressure reservoir in drilling engineering is gradually increased. In the process of drilling deep wells and ultra-deep wells, the requirement on the density of the drilling fluid is higher due to the high bottom pressure.
In drilling of deep wells and ultra-deep wells, the drilling fluid technology is the key of project success and failure, drilling speed and cost. The solution of the high temperature and high pressure problem in deep well engineering depends on the improvement of the performance of the drilling fluid, the high temperature resistant drilling fluid can keep the performance in the high temperature and high pressure environment, and the high density drilling fluid can keep the pressure balance of a shaft in the high pressure environment. The key of the quality of the drilling fluid for deep wells and ultra-deep wells is whether the drilling fluid can keep or basically keep the original performance under the conditions of high temperature, high pressure and high density.
The high-density drilling fluid has high content of heavy solid phase, and solid phase particles of the high-density drilling fluid participate in the formation of a gel structure of the drilling fluid. In high-density drilling fluid, especially in ultra-high-density drilling fluid, the probability of contact collision of weighted particles is increased, the frictional resistance among the particles is increased, stronger flow resistance is formed, and the viscosity and the shear force of a system are obviously increased.
The research on the influence of the particle size distribution of the weighting material and the reasonable grade on the performance of the drilling fluid is more and more emphasized in the industry. Practice shows that the particle size distribution and the particle size distribution of solid-phase particles in the high-density drilling fluid have very obvious influence on the rheological property and the filtration wall-building property of the drilling fluid. By reasonably grading the particle size of the weighting material particles, the particle size distribution of solid-phase particles in the high-density drilling fluid is optimized, the flow resistance of the drilling fluid can be effectively reduced, and the particle packing compactness of a drilling fluid system is improved. This is also an important technical approach to improve the rheology and fluid loss wall build of high density drilling fluids effectively.
At present, the research on the influence of the particle size distribution of the weighting material on the performance of the drilling fluid is often carried out in a complex drilling fluid system. The influence of the polymer treating agent with higher content and other solid-phase particles is not beneficial to the analysis and research of the rule of the grain size grading action of the weighting material. Meanwhile, the regulation mechanism and law of the particle size distribution and the particle size grade of the weighting material to the performance of the high-density drilling fluid are not sufficient, and the field practicability is lacked.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the present application.
The application aims to provide an experimental slurry for evaluating a weighting material. By compounding the particles of the weighting materials with different particle diameters, the comprehensive performance of the high-density drilling fluid is improved, and the synergistic regulation and control of the rheological property and the fluid loss wall building property of the high-density drilling fluid are achieved. Through the experimental slurry and the analysis method, the optimal particle compounding and surface treatment method of the weighting material is judged, and the weighting material can be applied to any drilling fluid system to achieve corresponding technical effects.
The application provides an evaluation aggravates experimental thick liquid of material, includes according to the part by weight: 900-1200 parts of weighting material, 4-15 parts of bentonite, 300-400 parts of water, 4-10 parts of tackifier, 4-10 parts of filtrate reducer and 1-2 parts of alkalizer.
Optionally, the experimental slurry consists of the following materials in parts by mass: 900-1200 parts of weighting material, 4-15 parts of bentonite, 300-400 parts of water, 4-10 parts of tackifier, 4-10 parts of filtrate reducer and 1-2 parts of alkalizer.
In one embodiment provided herein, the weighting material is selected from any one or more of barite powder, modified barite powder, iron ore powder, ilmenite powder, manganese ore powder and galena powder;
optionally, the weight material has a size of 4 μm to 200 μm.
In one embodiment provided herein, the bentonite is selected from any one or more of sodium bentonite, calcium bentonite and organobentonite.
In one embodiment provided herein, the tackifier is selected from one or more of acrylamide derivatives;
in one embodiment provided herein, optionally, the tackifier is selected from any one or more of dritemp, driscl D, calovis.
In one embodiment provided herein, the fluid loss additive is selected from any one or more of sulfonated lignite, sulfonated phenolic resin, sulfonated lignite resin;
in one embodiment provided herein, the alkalizing agent is selected from any one or more of sodium hydroxide, magnesium hydroxide and potassium hydroxide.
In one embodiment provided herein, the application process of the experimental slurry comprises the following steps:
1) Adding bentonite into water, and stirring to obtain a suspension 1;
2) Adding the tackifier into the suspension 1 in the step 1), and stirring to obtain a suspension 2;
3) Adding the filtrate reducer into the suspension 2) and stirring to obtain a suspension 3;
4) Adding the alkalizer into the suspension 3 in the step 3), and stirring to obtain a suspension 4;
5) Adding the weighting material to 4) the suspension 4.
In one embodiment provided herein, in step 1 and step 2), the stirring speed is 6000rpm to 8000rpm, and the stirring time is 10min to 15min;
in one embodiment provided herein, the stirring rate in step 3) and step 4) is 6000rpm to 8000rpm, and the stirring time is 5min to 10min;
in one embodiment provided herein, the stirring in step 5) is at a rate of 8000rpm to 12000rpm for a time period of 15min to 20min.
In another aspect, the present application provides a method for analyzing a weighting material in a drilling fluid, using the above-mentioned experimental slurry, the method for analyzing the weighting material in the drilling fluid comprising the steps of:
a) The weighting material is pretreated, the pretreatment is selected from any one or more of drying dehydration, mineral source optimization particle size grading, particle optimization, surface modification treatment and species combination,
adding the pretreated weighting material into the experimental slurry;
b) Measuring any one or more of an apparent viscosity, a plastic viscosity, a dynamic shear force, an API fluid loss, and a high temperature and high pressure fluid loss of the test slurry containing the weight material;
the performance of the weighting material in the experimental slurry is in positive correlation with the performance of the weighting material in the drilling fluid, and the performance of the weighting material in the experimental slurry can be judged according to the performance of the weighting material in the experimental slurry.
In one embodiment provided herein, the water salinity is not limited, and seawater may be used.
In one embodiment provided herein, the weighting material analysis method and experimental slurry provided herein can be applied to any weighting material for drilling fluid.
The application provides a high-density drilling fluid regulation and control method which has the main technical characteristics and effects that:
the apparent viscosity and the plastic viscosity of the high-density drilling fluid weighted by compounding the weighted material particles with different granularities are lower than those of the high-density drilling fluid weighted by compounding the weighted material particles with different granularities. In order to highlight the apparent viscosity and the plastic viscosity of the high-density drilling fluid compounded by the weighting material particles with different particle sizes or the weighting material treated by other modes, the application provides the experimental slurry for analyzing the weighting material in the drilling fluid. And a method of using the test slurry for weight material analysis. The experimental slurry and the analysis method can amplify the influence of the weighting material on the performance of the drilling fluid, such as parameters of apparent viscosity, plastic viscosity and the like. Through the experimental slurry and the analysis method, the optimal particle compounding and surface treatment method of the weighting material is judged, and the weighting material can be applied to any drilling fluid system to achieve corresponding technical effects.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the invention in its aspects as described in the specification.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application are described in detail below. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The embodiment of the application provides an experimental slurry for evaluating a weighted material, which comprises the following components in parts by weight: 900-1200 parts of weighting material, 4-15 parts of bentonite, 300-400 parts of water, 4-10 parts of tackifier, 4-10 parts of filtrate reducer and 1-2 parts of alkalizer.
Optionally, the experimental slurry consists of the following materials in parts by mass: 900-1200 parts of weighting material, 4-15 parts of bentonite, 300-400 parts of water, 4-10 parts of tackifier, 4-10 parts of filtrate reducer and 1-2 parts of alkalizer.
In the embodiment of the application, the weighting material is selected from any one or more of barite powder, modified barite powder, iron ore powder, ilmenite powder, manganese ore powder and galena powder;
optionally, the weighting material has a size of 4 μm to 200 μm.
In embodiments of the present application, the bentonite is selected from any one or more of sodium bentonite, calcium bentonite and organobentonite.
In the embodiments herein, the tackifier is selected from one or more of acrylamide derivatives;
in embodiments herein, optionally, the tackifier is selected from any one or more of dritemp, drisccal D, calovis.
In the embodiments of the present application, the fluid loss additive is selected from any one or more of sulfonated lignite, sulfonated phenolic resin, sulfonated lignite resin;
in the present embodiment, the alkalizing agent is selected from any one or more of sodium hydroxide, magnesium hydroxide and potassium hydroxide.
On the other hand, the embodiment of the application provides an analysis method of a weighting material in a drilling fluid, and by using the experimental slurry, the analysis method of the weighting material in the drilling fluid comprises the following steps:
a) The weighting material is pretreated, and the pretreatment is selected from any one or more of drying and dewatering, mineral source optimization and particle size grading, particle optimization, surface modification treatment and species combination,
adding the pretreated weighting material into the experimental slurry;
b) Measuring any one or more of apparent viscosity, plastic viscosity, dynamic shear force, API fluid loss, and high temperature and high pressure fluid loss of the test slurry containing the weight-increasing material;
the performance of the weighting material in the experimental slurry is in positive correlation with the performance of the weighting material in the drilling fluid, and the performance of the weighting material in the experimental slurry can be judged according to the performance of the weighting material in the experimental slurry.
In one embodiment provided herein, the water salinity is not limited, and seawater may be used.
In one embodiment provided herein, the weighting material analysis method and experimental slurry provided herein can be applied to any weighting material for drilling fluid.
Sodium bentonite was purchased from McBase, ml-Gel; calcium bentonite was purchased from Hexie county Hengjian Bentonite; organobentonite is purchased from Zhonghai oil clothes company under MOGEL brand;
tackifier Dristemp was purchased from Chevrolet; tackifier Driscal D was obtained from Chevrolet; tackifier Calovis was obtained from McBarre;
the sulfonated lignite is purchased from Longquan chemical plant company, SMC brand; the sulfonated phenolic resin is purchased from Shida Innovation corporation, SMP brand; lignite resin was purchased from jinsida, SPNH brand;
the surface-modified barite powder of example 3 was purchased from epi-powder ltd, and barium sulfate was precipitated;
example 1
(1) 5 parts by weight of sodium bentonite is added into 350 parts by weight of water, and the mixture is stirred by a high-speed stirrer at 8000rpm for 15min to prepare suspension.
(2) And (2) adding 6 parts by weight of tackifying polymer Dristemp into the suspension in the step (1), and continuously stirring for 10min by using a high-speed stirrer at 8000 rpm.
(3) And (3) adding 7 parts by weight of sulfonated lignite into the suspension liquid in the step (2), and continuously stirring for 5min by using a high-speed stirrer at the rotating speed of 8000 rpm.
(4) And (4) adding 1 part by weight of magnesium hydroxide into the suspension liquid in the step (3), and continuously stirring for 5min by using a high-speed stirrer at the rotating speed of 8000 rpm. Thus obtaining the experimental slurry for analyzing the weighting material in the drilling fluid.
(5) And (3) adding 1200 parts by weight of barite powder into the suspension liquid in the step (4) according to different weight proportions of the barite powder with the granularity of 200 meshes to 3000 meshes, and stirring for 20min at the rotating speed of 12000. The results of the rheology and fluid loss testing of the experimental slurries with different proportions of weighting agents are detailed in table 1.
Example 2
(1) 5 parts by weight of calcium bentonite is added into 300 parts by weight of water, and the mixture is stirred by a high-speed stirrer at 8000rpm for 15min to prepare suspension.
(2) Then 5 parts by weight of tackifying polymer pharmaceutical-D is added to the suspension in (1), and the high-speed stirrer is used for stirring continuously for 10min at 8000 rpm.
(3) And (3) adding 8 parts by weight of sulfonated phenolic resin into the suspension in the step (2), and continuously stirring for 5min by using a high-speed stirrer at the rotating speed of 8000 rpm.
(4) And (3) adding 2 parts by weight of sodium hydroxide into the suspension, and continuously stirring for 5min by using a high-speed stirrer at the rotating speed of 8000 rpm. Thus obtaining the experimental slurry for analyzing the weighting material in the drilling fluid.
(5) Adding 900 parts by weight of barite powder into the suspension liquid in the step (4) according to different weight proportions of 200 meshes to 1250 meshes, and stirring at 12000 rotating speed for 20min. The results of the rheology and fluid loss testing of the experimental slurries with different proportions of weighting agents are detailed in table 2.
Example 3
(1) 5 parts by weight of organic bentonite is added into 400 parts by weight of water, and the mixture is stirred by a high-speed stirrer at 8000rpm for 15min to prepare suspension.
(2) Then, 7 parts by weight of a tackifying polymer Driscal-D was added to the suspension described in (1), and the stirring was continued for 10min with a high-speed stirrer at 8000 rpm.
(3) And (3) adding 10 parts by weight of sulfonated lignite resin into the suspension liquid in the step (2), and continuously stirring for 5min by using a high-speed stirrer at the rotating speed of 8000 rpm.
(4) And (4) adding 2 parts by weight of potassium hydroxide into the suspension in the step (3), and continuously stirring for 5min by using a high-speed stirrer at 8000 rpm. Thus obtaining the experimental slurry for analyzing the weighting material in the drilling fluid.
(5) And (3) adding 1200 parts by weight of surface modified barite powder into the suspension liquid in the step (4) according to different weight proportions of 450 meshes to 3000 meshes, and stirring at 12000 rotating speed for 20min. The results of the rheology and fluid loss testing of the experimental slurries with different proportions of weighting agents are detailed in table 3.
Experimental example 1
The test solutions prepared in examples 1 to 3 were loaded into an aging jar and hot rolled at 180 ℃ for 16 hours, and their rheological parameters were measured at room temperature.
Table 1 example 1 results of rheological and fluid loss testing of experimental slurries
As can be seen from example 1 in table 1, compared with the weighting by using 200 mesh barite powder and 3000 mesh barite powder alone, the weighting test slurry provided in example 1 is compounded with 200 mesh barite powder before and after hot rolling at 180 ℃/16h, the apparent viscosity and the plastic viscosity before and after aging of the test slurry are obviously reduced, the dynamic shear force is increased, but the medium-pressure filtration loss and the high-temperature and high-pressure filtration loss before and after aging of the test slurry are increased.
In the grading interval, with the increase of the content of small-particle barite (3000 meshes) in the composite proportion, the apparent viscosity of the experimental slurry shows a trend of firstly decreasing and then increasing, and when the proportion of 200 meshes to 3000 meshes is 7. In terms of the filtration loss, the filtration loss (medium pressure, high temperature and high pressure) of the experimental slurry is gradually increased along with the increase of the content of small-particle barite (3000 meshes) in the grading proportion, and the filtration loss of the experimental slurry is lower when the proportion of 200 meshes to 3000 meshes is 7.
Table 2 example 2 results of rheological and fluid loss testing of experimental slurries
As can be seen from example 2 in table 2, the weighting test slurry provided in example 2 is prepared by compounding and weighting 200-mesh and 1250-mesh barite powders before and after hot rolling at 180 ℃/16h, compared with weighting by only using 200-mesh barite, the apparent viscosity and the plastic viscosity of the test slurry before and after aging are obviously reduced, but the filtration loss (medium pressure, high temperature and high pressure) of the test slurry before and after aging is increased.
In the grading interval, with the increase of the content of small-particle barite (1250 meshes) in the composite proportion, the apparent viscosity, the plastic viscosity and the dynamic shear force before and after the aging of the experimental slurry are both reduced gradually, and when 200 barite is 3, 2. As for the filtration loss, the medium-pressure filtration loss and the high-temperature and high-pressure filtration loss before and after the aging of the experimental slurry gradually increase along with the increase of the content of the small-particle barite (1250 meshes) in the composite proportioning.
The comprehensive consideration of the rheological property and the filtration loss of the experimental slurry shows that when the experimental slurry is compounded by 200-mesh barite and 1250-mesh barite and is not aggravated to high density, the comprehensive performance of the experimental slurry cannot achieve synergistic regulation, and in the actual application process, the specific grading aggravation aiming at a certain performance of the drilling fluid can be considered to improve the performance. If the filtration control is mainly used, 1250-mesh barite is not recommended to be used for compounding the drilling liquid crystal; if the rheological control is taken as the main factor, 200 barite to 1250-mesh barite is recommended to be compounded and aggravated nearby the proportion of 3; if the rheological property and the filtration loss are comprehensively adjusted, the compound weight is increased by taking 200 barite to 1250-mesh barite as 7.
Table 3 example 3 results of rheological and fluid loss testing of experimental slurries
As can be seen from example 3 in table 3, compared with the weighting by singly using 450 mesh barite, the weighting obtained by compounding 450 mesh 3000 mesh barite powder with the weighting experimental slurry provided in example 3 before and after hot rolling at 180 ℃/16h has significantly reduced apparent viscosity and plastic viscosity before and after aging, and the fluid loss (medium pressure, high temperature and high pressure) before and after aging of the experimental slurry has no significant change.
In the grading interval, when the dispersing agent is added into the experimental slurry, along with the increase of the content of small-particle barite (3000) in the mixture ratio, the apparent viscosity and the plastic viscosity of the experimental slurry are firstly reduced and then increased, and when the mixture ratio of 450 meshes to 3000 meshes is 5, the apparent viscosity and the plastic viscosity of the experimental slurry are lowest. In terms of fluid loss, the difference was not significant, but was minimal at a 450 mesh to 3000 mesh ratio of 7.
Application example 1
The weighting materials in the embodiment 1 are respectively added into the drilling fluid, and the effect of the weighting materials with the same grain size distribution in the drilling fluid is tested;
the drilling fluid was purchased from mibobbs, envirotherm, inc.
And (3) respectively filling the drilling fluid added with the weighting material into an aging tank, hot rolling for 16h at 220 ℃, and measuring rheological parameters of the drilling fluid at normal temperature.
TABLE 4 drilling fluid rheology, fluid loss test results
As can be seen from the application example 1 in Table 4, the weighting rule of compounding 200-mesh 3000-mesh barite powder before and after 220 ℃/16h hot rolling is the same as that in the example 1, but if the drilling fluid in the application example 1 is directly applied, the grain composition comparison effect of weighting materials with different grain sizes is not obvious, and the grading behavior cannot be explored.
Application example 2
The weighting materials in the embodiment 2 are respectively added into the drilling fluid, and the effect of the weighting materials with the same grain size distribution in the drilling fluid is tested;
the drilling fluid is purchased from Zhonghai oil and gas company, PDF-Therm brand.
And (3) respectively filling the drilling fluid added with the weighting material into an aging tank, hot rolling for 16h at 220 ℃, and measuring rheological parameters of the drilling fluid at normal temperature.
TABLE 5 drilling fluid rheology, fluid loss test results
As can be seen from the application example 2 in Table 5, the rule of compounding and weighting the 200-mesh 1250-mesh barite powder before and after 220 ℃/16h hot rolling is the same as that in the example 2, but if the drilling fluid in the application example 2 is directly applied, the grain composition comparison effect of weighting materials with different grain sizes is not obvious, and the grading behavior cannot be explored.
Application example 3
The weighting materials in the embodiment 3 are respectively added into the drilling fluid, and the effect of the weighting materials with the same grain size distribution in the drilling fluid is tested;
the drilling fluid is purchased from the university of petroleum in China (east China), HIDRILL brand.
And (3) respectively filling the drilling fluid added with the weighting material into an aging tank, hot rolling for 16h at 200 ℃, and measuring rheological parameters of the drilling fluid at normal temperature.
TABLE 6 drilling fluid rheology, fluid loss test results
As can be seen from the application example 3 in the table 5, the compounding and weighting rule of the 450-mesh 3000-mesh barite powder before and after the hot rolling at 200 ℃/16h is the same as that in the example 3, but if the drilling fluid in the application example 3 is directly applied, the grain composition comparison effect of the weighting materials with different grain sizes is not obvious, and the grading behavior cannot be explored.
Comparative example 1
This comparative example differs from example 1 only in that the experimental slurry, which does not involve the high temperature resistant polymer thickener but is replaced with xanthan gum, consists of sodium bentonite, xanthan gum, sulfonated lignite, magnesium hydroxide, barite and water.
The weight material in the experimental slurry was added in the same manner as in example 1 in accordance with the compounding ratio shown in the following table to obtain the experimental slurry. The obtained experimental slurry is put into an aging tank and is hot rolled for 16h at 180 ℃, and rheological parameters of the experimental slurry are measured at normal temperature.
TABLE 7 test results of rheology and fluid loss of experimental slurries
As can be seen from table 7, since the tackifier was replaced in this comparative example, the gradation rules of 200 mesh and 3000 mesh barites may not be obtained, and the system is not resistant to high temperature, and cannot simulate the effect of the weighting material on high density drilling fluid under high temperature condition.
As can be seen by comparing table 7 with table 1, the apparent viscosity and plastic viscosity of the experimental slurry in comparative example 1 are significantly different from those of the drilling fluid in application example 1 on the basis of the same weight material condition, and the fluid loss amount cannot be measured. The effect of the application of the weighting material in the experimental slurry provided in comparative example 1 could not be used to predict the effect of the application of the weighting material in a conventional drilling fluid.
Comparative example 2
The comparative example differs from example 2 only in that no fluid loss additive is involved in the experimental slurry, consisting only of calcium bentonite, tackifier, magnesium hydroxide, barite and water.
The weight material in the experimental slurry was added in the same manner as in example 1 in accordance with the compounding ratio shown in the following table to obtain the experimental slurry. The obtained experimental slurry is put into an aging tank and is hot rolled for 16h at 180 ℃, and rheological parameters of the experimental slurry are measured at normal temperature.
TABLE 8 test results of rheology and fluid loss of experimental slurries
As can be seen from table 8, since the comparative example does not relate to a fluid loss additive, the gradation rules of 200 mesh and 3000 mesh barite cannot be obtained, which is not in accordance with the practical application effect.
As can be seen by comparing table 8 and table 1, the experimental slurry in comparative example 2 has significantly different fluid loss wall-building properties from the drilling fluid in application example 1 on the basis of the same weight material strip. The effect of the application of the weighting material in the experimental slurry provided in comparative example 2 cannot be used to predict the effect of the application of the weighting material in a conventional drilling fluid.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (8)
1. A method of evaluating a weight material, wherein a test slurry for evaluating a weight material is used, the method comprising the steps of:
a) The weighting material is pretreated, the pretreatment is selected from any one or more of drying dehydration, mineral source optimization particle size grading, particle optimization, surface modification treatment and species combination,
adding the pretreated weighting material into the experimental slurry;
b) Measuring any one or more of apparent viscosity, plastic viscosity, dynamic shear force, API fluid loss, and high temperature and high pressure fluid loss of the test slurry containing the weight-increasing material;
the performance of the weighting material in the experimental slurry is in positive correlation with the performance of the weighting material in the drilling fluid, and the performance of the weighting material in the drilling fluid is judged according to the performance of the weighting material in the experimental slurry;
the experimental slurry for evaluating the weighting material comprises the following components in parts by weight: 900-1200 parts of weighting material, 4-15 parts of bentonite, 300-400 parts of water, 4-10 parts of tackifier, 4-10 parts of filtrate reducer and 1-2 parts of alkalizer;
the weighting material is selected from any one or more of barite powder, modified barite powder, iron ore powder, ilmenite powder, manganese ore powder and galena powder;
the tackifier is selected from any one or more of Dristemp, driscal D and Calovis.
2. The method of evaluating a weight material according to claim 1, wherein the bentonite is selected from any one or more of sodium bentonite, calcium bentonite and organobentonite.
3. The method of evaluating a weighting material according to any one of claims 1 to 2, wherein the fluid loss additive is selected from any one or more of sulfonated lignite, sulfonated phenol-formaldehyde resin, sulfonated lignite resin.
4. A method of evaluating a weight material according to claim 3, wherein the alkalizing agent is selected from any one or more of sodium hydroxide, magnesium hydroxide and potassium hydroxide.
5. The method for evaluating a weight material according to any one of claims 1 to 2, wherein the use of the test slurry comprises the steps of:
1) Adding bentonite into water, and stirring to obtain a suspension 1;
2) Adding the tackifier into the suspension 1 in the step 1), and stirring to obtain a suspension 2;
3) Adding the filtrate reducer into the suspension 2) and stirring to obtain a suspension 3;
4) Adding the alkalizer into the suspension 3 in the step 3), and stirring to obtain a suspension 4;
5) Adding the weighting material to 4) the suspension 4.
6. The method for evaluating a weight material according to claim 5, wherein the stirring rate is 6000rpm to 8000rpm and the stirring time is 10min to 15min in step 1 and step 2).
7. The method for evaluating a weight material according to claim 5, wherein the stirring rate in step 3) and step 4) is 6000rpm to 8000rpm, and the stirring time is 5min to 10min.
8. The method for evaluating a weight material according to claim 5, wherein the stirring in step 5) is at a rate of 8000rpm to 12000rpm for a time of 15min to 20min.
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