CN114702944A - Ultra-high density drilling fluid - Google Patents
Ultra-high density drilling fluid Download PDFInfo
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- CN114702944A CN114702944A CN202210205289.5A CN202210205289A CN114702944A CN 114702944 A CN114702944 A CN 114702944A CN 202210205289 A CN202210205289 A CN 202210205289A CN 114702944 A CN114702944 A CN 114702944A
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- 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
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
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- 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
- C09K8/14—Clay-containing compositions
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Abstract
The invention discloses an ultra-high density drilling fluid, which belongs to the technical field of drilling fluids and comprises the following components in parts by weight: 50-80 parts of weighting agent modified spherical ferric oxide, 20-60 parts of cement, 20-28 parts of water, 0.1-0.2 part of defoaming agent, 0-0.25 part of solid fluid loss agent, 0-0.3 part of liquid fluid loss agent, 0.2-25 g of dispersing agent, 0-10 g of retarder, 0-0.15 part of crude silicon powder, 0-0.3 part of expanding agent and 0-0.3 g of anti-channeling reinforcing agent. According to the invention, the abutting strength of the surfaces of iron oxide particles is ensured, the abrasion to the surfaces of the drill bits is reduced through the surface station effect of the polyethylene glycol, the drill bits are easy to crystallize and have larger phase change enthalpy, although a liquid state can be generated in the phase change process, and the spherical iron oxide has scientific particle size distribution, small particles and large particles are mixed according to the mesh classification, so that the small particles have high filling rate and good fluidity, and a drilling fluid with higher density can be prepared, and simultaneously the water loss is reduced by preparing the liquid.
Description
Technical Field
The invention belongs to the technical field of drilling fluids, and particularly relates to an ultrahigh-density drilling fluid.
Background
Drilling fluid is a circulating flushing medium used in the hole during drilling. Also known as drilling flushing fluid. The drilling fluid can be divided into clear water, slurry, clay-phase-free flushing fluid, emulsion, foam, compressed air and the like according to the composition. The clean water is the earliest drilling fluid, does not need to be treated, is convenient to use and is suitable for regions with complete rock stratums and sufficient water sources. The mud is widely used drilling fluid and is mainly suitable for unstable rock formations of hole walls, such as loose rock formations, fracture development, easy collapse and block falling, water swelling and peeling, and the like.
Drilling fluids consist of a dispersion medium, a dispersed phase and additives, typically weighting agents, which act to increase the density of the drilling fluid without affecting the properties of the materials or additives used.
In the prior art, the weighting agent for the CN200610113488.4 oilfield drilling fluid and the preparation method thereof, the weighting agent mainly comprises one or more inorganic electrolytes, silicate, one or more surfactants and weighting materials, not only has higher weighting efficiency, but also has good dynamic stability in the drilling fluid, and is very suitable for being used in severe environments such as high temperature, high pressure, high salt and the like.
CN201080021501.8 a high performance drilling fluid using sub-micron sized particles as weighting agent, methods and compositions using a drilling fluid comprising sub-micron precipitated barite having a weight average particle size of less than about 1 micron. The disclosed method comprises: a method of circulating a drilling fluid in a wellbore, wherein the drilling fluid comprises a carrier fluid; and a weighting agent comprising sub-micron precipitated barite having a weight average particle size of less than about 1 micron. In some embodiments, the drilling fluid may comprise an invert emulsion.
CN201280030333.8 weighting agent for use in subterranean wells. A weighting agent composition for use in a cement slurry for use in drilling operations of a subterranean well, the composition comprising: a finely divided solid weighting agent; and a dispersant comprising a sulfonic acid, salt or derivative thereof, the sulfonic acid having the general formula (I): - [ A (OSOO. about. M +) -B-A '(OSOO-M +) ] n-, where A and A' are each an aromatic moiety; b is an aliphatic moiety; OSOO-M + is a solubilizing group consisting of sulfonic acid, its salts or derivatives; and n is an integer of at least 2. The composition is particularly useful for formulating a cement slurry for use in a downhole cementing operation. Also provided are methods of using the sulfonic acid of formula (I), preparing a finely divided weighting agent, cement formulations containing the composition and methods of cementing subterranean wells. The technical scheme of the patent is to utilize barite, galena, quartz stone, limestone, water-soluble salt, calcium chloride, zinc bromide, sodium bromide, salt and the like.
With the development of shallow oil-gas reservoirs entering the exhaustion stage, oil-gas exploitation is developing towards deep wells and ultra-deep wells, and the conventional density cement slurry system and other prior art can not meet the requirements of well cementation operation, so that the research on a high density cement slurry system is particularly important.
However, the density of the high-density cement slurry of the drilling fluid commonly used in China at present is difficult to exceed 2.6g/cm3The common weighting agent barite powder can only ensure that the weighting density is not more than 2.30g/cm3Water-based and oil-based drilling fluids of (a); limestone powder can only be used for preparing the limestone powder with the density not more than 1.68g/cm3The drilling and completion fluids of (a); the density of the square lead ore powder is as high as 7.4-7.7 g/cm3The 3.0g/cm3 ultrahigh-density drilling fluid can be prepared, but the weighting agent has high cost and few goods sources, is only used under the special condition of extremely high formation pore pressure, and cannot be popularized and used in large quantities.
The density of the common hematite is 4.5-5.1 g/cm3Brown or dark brown powder. Because their density is greater than that of barite, they can be used to prepare drilling fluid with higher density, and they have a certain acid solubility, so that they can be used in the production zone to be acidified, and their hardness is about twice that of barite, so that they are resistant to grinding, and in the course of use, their grain size can be retained better, and their loss rate is lower, but their wear to drilling tool, drill bit and pump is also serious.
Thus, there is a need for a weighting agent that can provide drilling fluids with a density of 2.6g/cm3The cement slurry has the advantages of no abrasion to a drilling tool, a drill bit and a pump, good rheological property and sedimentation stability, low water loss, high compressive strength and the like, can be effectively applied to well cementation of deep wells and ultra-deep wells, and is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to: the ultra-high density drilling fluid is provided for solving the problem that the traditional ultra-high density drilling fluid has serious abrasion on a drilling tool, a drill bit and a pump.
In order to achieve the purpose, the invention adopts the following technical scheme:
an ultrahigh-density drilling fluid comprises the following components in parts by weight: 50-80 parts of weighting agent modified spherical iron oxide, 20-60 parts of cement, 20-28 parts of water, 0.1-0.2 part of defoaming agent, 0-0.25 part of solid fluid loss agent, 0-0.3 part of liquid fluid loss agent, 0.2-25 g of dispersing agent, 0-10 g of retarder, 0-0.15 part of coarse silicon powder, 0-0.3 part of expanding agent and 0-0.3 g of anti-channeling reinforcing agent.
As a further description of the above technical solution:
the preparation method of the modified spherical iron oxide specifically comprises the following steps:
s101, dissolving hematite powder and modified polyethylene glycol in distilled water, slowly dropping an ammonium carbonate solution and a sodium dodecyl sulfate solution under the condition of ultrasonic oscillation addition to obtain a colloid, alternately washing the colloid with distilled water and sewage ethanol, and drying the colloid in vacuum for a period of time to obtain nano-scale modified spherical iron oxide particles;
S102, conveying the nanoscale modified spherical iron oxide particles into a furnace body for heating and spheroidizing, conveying the particles into flame for burning main combustion oxygen and natural gas by using high-pressure oxygen, enabling the temperature to reach over 2400 ℃, forming dispersed small droplets after flame melting, quickly entering a cooling area under the action of negative pressure, condensing the small droplets into spherical particles to obtain spherical iron oxide, and segmenting the spherical iron oxide of the prepared modified spherical iron oxide particles into 200-220 meshes and 1800-2000 meshes according to meshes, and mixing the two segments according to the proportion of 1: 0.1-0.3, wherein the mixing time is 30-40 min.
As a further description of the above technical solution:
the modified polyethylene glycol is organic silicon modified polyethylene glycol.
As a further description of the above technical solution:
the liquid fluid loss agent is a composite deformed starch fluid loss agent.
As a further description of the above technical solution:
the preparation method of the liquid fluid loss agent comprises the following steps: adding polyvinyl chloride into the dried wood comb starch, glycerol and sodium hydroxide aqueous solution, then carrying out blending treatment by a high-speed mixer, mixing the PAV particles with water, sequentially adding calcium carbonate and stearic acid auxiliaries into the mixer, blending for 5min, adding the mixture into a double-screw extruder, and carrying out melt extrusion granulation.
As a further description of the above technical solution:
the method for pretreating the wood comb starch comprises the steps of drying the wood comb starch at constant temperature for 24 hours, and cooling to room temperature for later use.
As a further description of the above technical solution:
the extruder subsection temperature of the double-screw extruder is sequentially set to be 90, 120, 140, 120, 110, 90 and 90 ℃, and the rotating rod speed is 60 r/min.
As a further description of the above technical solution:
the defoaming agent is a silicon-containing oil defoaming agent.
As a further description of the above technical solution:
fully mixing the components according to the formula ratio to prepare the ultra-high density drilling fluid, wherein the density of the drilling fluid exceeds 2.6g/cm3。
As a further description of the above technical solution:
the feeding speed of the nanometer modified spherical ferric oxide particles is 10-40 Hz, the high-pressure oxygen conveying amount is 110-190 m3/h, the main combustion oxygen amount is 550-660 m3/h, the natural gas amount is 220-330 m3/h, and the oxygen enrichment coefficient is 1.0-1.3.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
compared with the common weighting agent barite, the spherical iron oxide weighting agent has certain acid solubility and can be used for a stratum needing to be acidified, the spherical iron oxide weighting agent has smaller surface area than that of irregular particles, the consistency of the ultra-high density drilling fluid cannot be improved, meanwhile, the spatial structure strength of spherical iron oxide particles is improved by polyethylene glycol, the polyethylene glycol can effectively improve the surface slump defect of the spherical iron oxide, the abutting strength of the surfaces of the iron oxide particles is ensured, the abrasion to the surface of a drill bit is reduced by the surface station effect of the polyethylene glycol, the spherical iron oxide weighting agent is easy to crystallize and has larger phase change enthalpy, although a liquid state can be generated in the phase change process, the spherical iron oxide has scientific particle size distribution, the small particles and large particles are mixed according to the order classification, the small particles are high in filling rate and good in fluidity, the drilling fluid with higher density can be prepared, and meanwhile, the water delivery effect of the drilling fluid in the drilling process can be effectively improved by compounding the polyvinyl chloride and the wood comb starch in the preparation of the liquid fluid loss agent.
Drawings
FIG. 1 is a schematic representation of the structure of hematite ore employed in the present invention;
FIG. 2 is a schematic view of the structure of a spherical iron oxide of the present invention;
FIG. 3 is an enlarged schematic view of the spherical iron oxide of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-3, the present invention provides a technical solution:
an ultra-high density drilling fluid comprises the following components in parts by weight: 50 parts of weighting agent modified spherical ferric oxide, 20 parts of cement, 20 parts of water, 0.1 part of defoaming agent, 0.15 part of solid fluid loss agent, 0.1 part of liquid fluid loss agent, 0.2g of dispersing agent, 1g of retarder, 0.05 part of coarse silicon powder, 0.1 part of expanding agent and 0.1g of channeling-preventing reinforcing agent;
the preparation method of the modified spherical iron oxide specifically comprises the following steps:
s101, dissolving hematite powder and modified polyethylene glycol in distilled water, slowly dropping an ammonium carbonate solution and a sodium dodecyl sulfate solution under the condition of ultrasonic oscillation addition to obtain a colloid, alternately washing the colloid with distilled water and sewage ethanol, and drying the colloid in vacuum for a period of time to obtain nano-scale modified spherical iron oxide particles;
S102, conveying the nanoscale modified spherical iron oxide particles into a furnace body for heating and spheroidizing, conveying the particles into flame for burning main combustion oxygen and natural gas by using high-pressure oxygen, enabling the temperature to reach over 2400 ℃, forming dispersed small droplets after flame melting, quickly entering a cooling area under the action of negative pressure, condensing the small droplets into spherical small particles to obtain spherical iron oxide, segmenting the prepared modified spherical iron oxide particles into two sections of 200 meshes and 1800 meshes according to meshes, and mixing the two sections of the spherical iron oxide particles according to the proportion of 1: 0.1-0.3, wherein the mixing time is 30 min;
the modified polyethylene glycol is organic silicon modified polyethylene glycol;
the liquid fluid loss agent is a composite modified starch fluid loss agent, and the preparation method of the liquid fluid loss agent comprises the following steps: adding polyvinyl chloride into dried wood comb starch, glycerol and a sodium hydroxide aqueous solution, then carrying out blending treatment by a high-speed mixer, mixing PAV particles with water, sequentially adding calcium carbonate and a stearic acid auxiliary agent into the mixer, blending for 5min, adding the mixture into a double-screw extruder, and carrying out melt extrusion granulation, wherein the wood comb starch pretreatment method comprises the steps of drying the wood comb starch at a constant temperature for 24h, cooling to room temperature for later use, the sectional temperature of the extruder of the double-screw extruder is sequentially set to be 90, 120, 140, 120, 110, 90 and 90 ℃, the rotating rod speed is 60r/min, the defoaming agent is a silicon-containing oil defoaming agent, and after fully mixing the components according to the formula amount, the ultrahigh-density drilling fluid is prepared, and the density of the drilling fluid exceeds 2.6g/cm 3The feeding speed of the nanometer modified spherical iron oxide particles is 10Hz, the high-pressure oxygen conveying amount is 110m3/h, the main combustion oxygen amount is 550m3/h, the natural gas consumption is 220m3/h, and the oxygen enrichment coefficient is 1.0.
Example 2
Different from the embodiment 1, the embodiment also discloses an ultrahigh-density drilling fluid which comprises the following components in parts by weight: 65 parts of weighting agent modified spherical iron oxide, 40 parts of cement, 24 parts of water, 0.15 part of defoaming agent, 0.20 part of solid fluid loss agent, 0.2 part of liquid fluid loss agent, 15g of dispersing agent, 15g of retarder, 0.8 part of coarse silicon powder, 0.2 part of expanding agent and 0.2g of channeling-preventing reinforcing agent;
the preparation method of the modified spherical iron oxide specifically comprises the following steps:
s101, dissolving hematite powder and modified polyethylene glycol in distilled water, slowly dropping an ammonium carbonate solution and a sodium dodecyl sulfate solution under the condition of ultrasonic oscillation addition to obtain a colloid, alternately washing the colloid with distilled water and sewage ethanol, and drying the colloid in vacuum for a period of time to obtain nano-scale modified spherical iron oxide particles;
s102, conveying the nanoscale modified spherical iron oxide particles into a furnace body for heating and spheroidizing, conveying the particles into flame for burning main combustion oxygen and natural gas by using high-pressure oxygen, enabling the temperature to reach over 2400 ℃, forming dispersed small droplets after flame melting, quickly entering a cooling area under the action of negative pressure, condensing the small droplets into spherical small particles to obtain spherical iron oxide, segmenting the prepared modified spherical iron oxide particles into 210-mesh and 1900-mesh segments according to meshes, and mixing the segments according to a ratio of 1: 0.1-0.3, wherein the mixing time is 30-40 min;
The modified polyethylene glycol is organic silicon modified polyethylene glycol;
the liquid fluid loss agent is a composite deformed starch fluid loss agent, and the preparation method of the liquid fluid loss agent comprises the following steps: adding polyvinyl chloride into dried wood comb starch, glycerol and a sodium hydroxide aqueous solution, then carrying out blending treatment by a high-speed mixer, mixing PAV particles with water, sequentially adding calcium carbonate and a stearic acid auxiliary agent into the mixer, blending for 5min, adding the mixture into a double-screw extruder, and carrying out melt extrusion granulation, wherein the wood comb starch pretreatment method comprises the steps of drying the wood comb starch at a constant temperature for 24h, cooling to room temperature for later use, the sectional temperature of the extruder of the double-screw extruder is sequentially set to be 90, 120, 140, 120, 110, 90 and 90 ℃, the rotating rod speed is 60r/min, the defoaming agent is a silicon-containing oil defoaming agent, and after fully mixing the components according to the formula amount, the ultrahigh-density drilling fluid is prepared, and the density of the drilling fluid exceeds 2.6g/cm3The nano-scale modified spherical iron oxide particles have the feeding speed of 10-40 Hz, the high-pressure oxygen delivery amount of 110-190 m3/h, the main combustion oxygen amount of 550-660 m3/h, the natural gas amount of 220-330 m3/h and the oxygen enrichment coefficient of 1.0-1.3
Example 3
Different from the embodiments 1-2, the embodiment discloses an ultrahigh-density drilling fluid which comprises the following components in parts by weight: 80 parts of weighting agent modified spherical ferric oxide, 60 parts of cement, 28 parts of water, 0.2 part of defoaming agent, 0.25 part of solid fluid loss agent, 0.3 part of liquid fluid loss agent, 25g of dispersing agent, 10g of retarder, 0.15 part of coarse silicon powder, 0.3 part of expanding agent and 0.3g of channeling-preventing reinforcing agent;
the preparation method of the modified spherical iron oxide specifically comprises the following steps:
s101, dissolving hematite powder and modified polyethylene glycol in distilled water, slowly dropping an ammonium carbonate solution and a sodium dodecyl sulfate solution under the condition of ultrasonic oscillation addition to obtain a colloid, alternately washing the colloid with distilled water and sewage ethanol, and drying the colloid in vacuum for a period of time to obtain nano-scale modified spherical iron oxide particles;
s102, conveying the nanoscale modified spherical iron oxide particles into a furnace body for heating and spheroidizing, conveying the particles into flame for burning main combustion oxygen and natural gas by using high-pressure oxygen, enabling the temperature to reach over 2400 ℃, forming dispersed small droplets after flame melting, quickly entering a cooling area under the action of negative pressure, condensing the small droplets into spherical small particles to obtain spherical iron oxide, segmenting the prepared modified spherical iron oxide particles, namely the spherical iron oxide, into 200-220 meshes and 1800-2000 meshes, and mixing the two segments according to a ratio of 1: 0.1-0.3, wherein the mixing time is 30-40 min;
The modified polyethylene glycol is organic silicon modified polyethylene glycol;
the liquid fluid loss agent is a composite modified starch fluid loss agent, and the preparation method of the liquid fluid loss agent comprises the following steps: adding polyvinyl chloride into dried cassava starch, glycerol and sodium hydroxide aqueous solution, then carrying out blending treatment by a high-speed mixer, mixing PAV particles with water, sequentially adding calcium carbonate and stearic acid auxiliaries, blending for 5min, adding the mixture into a double-screw extruder, and carrying out melt extrusion granulation, wherein the wood comb starch pretreatment method comprises the steps of drying the wood comb starch at constant temperature for 24h, cooling to room temperature for later use, the sectional temperature of the double-screw extruder is sequentially set to 90, 120, 140, 120, 110, 90 and 90 ℃, the rotating rod speed is 60r/min, the defoaming agent is a silicon-containing oil defoaming agent, and fully mixing the components according to the formula amount to prepare the ultrahigh-density drilling fluid,the density of the drilling fluid exceeds 2.6g/cm3The feeding speed of the nanometer modified spherical ferric oxide particles is 10-40 Hz, the high-pressure oxygen conveying amount is 110-190 m3/h, the main combustion oxygen amount is 550-660 m3/h, the natural gas consumption is 220-330 m3/h, and the oxygen enrichment coefficient is 1.0-1.3;
The drilling fluid prepared in examples 1-3 was made into 2.49g/cm at 120 ℃3Ash discharge time under the system, and comparative experiment of purchasing micro-manganese drilling fluid, rheological property, core covering after maintenance, sedimentation and stability
As can be seen from the above table, example 2 is the preferred embodiment of the present invention, and the sample density, ash time and rheology are all better.
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 considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The ultrahigh-density drilling fluid is characterized by comprising the following components in parts by weight: 50-80 parts of weighting agent modified spherical iron oxide, 20-60 parts of cement, 20-28 parts of water, 0.1-0.2 part of defoaming agent, 0-0.25 part of solid fluid loss agent, 0-0.3 part of liquid fluid loss agent, 0.2-25 g of dispersing agent, 0-10 g of retarder, 0-0.15 part of coarse silicon powder, 0-0.3 part of expanding agent and 0-0.3 g of anti-channeling reinforcing agent.
2. The ultra-high density drilling fluid as claimed in claim 1, wherein the preparation method of the modified spherical iron oxide comprises the following steps:
S101, dissolving hematite powder and modified polyethylene glycol in distilled water, slowly dripping ammonium carbonate solution and sodium dodecyl sulfate solution under the condition of ultrasonic oscillation addition to obtain colloid, alternately washing with distilled water and sewage ethanol, and drying in vacuum for a period of time to obtain nano-scale modified spherical iron oxide particles;
s102, feeding nanoscale modified spherical iron oxide particles into a furnace body for heating and spheroidizing, conveying the particles into flame for burning main combustion oxygen and natural gas by using high-pressure oxygen, enabling the temperature to reach over 2400 ℃, melting the flame to form dispersed small droplets, quickly entering a cooling area under the action of negative pressure, condensing the small droplets into spherical particles to obtain spherical iron oxide, segmenting the prepared modified spherical iron oxide particles into two sections of 200-220 meshes and 1800-2000 meshes according to meshes, and mixing the two sections according to the proportion of 1: 0.1-0.3, wherein the mixing time is 30-40 min.
3. The ultra-high density drilling fluid of claim 2, wherein the modified polyethylene glycol is an organosilicon modified polyethylene glycol.
4. The ultra-high density drilling fluid of claim 1, wherein the liquid fluid loss additive is a complex modified starch fluid loss additive.
5. The ultra-high density drilling fluid according to claim 4, wherein the preparation method of the fluid loss additive comprises the following steps: adding polyvinyl chloride into the dried cassava starch, glycerol and sodium hydroxide aqueous solution, then carrying out blending treatment by a high-speed mixer, mixing polyvinyl chloride particles with water, sequentially adding calcium carbonate and stearic acid auxiliaries into the mixer, blending for 5min, and adding the mixture into a double-screw extruder for melt extrusion granulation.
6. The drilling fluid as claimed in claim 5, wherein the pretreatment method comprises drying the wood comb starch at constant temperature for 24h, and cooling to room temperature for use.
7. The ultra-high density drilling fluid as claimed in claim 5, wherein the extruder segment temperature of the twin-screw extruder is sequentially set to 90, 120, 140, 120, 110, 90 ℃ and the rotating rod speed is 60 r/min.
8. The ultra-high density drilling fluid of claim 1, wherein the defoamer is a silicone-containing oil defoamer.
9. The method for preparing the ultra-high density drilling fluid according to claim 1, wherein the ultra-high density drilling fluid is prepared by fully mixing the components according to the formula ratio, and the density of the drilling fluid exceeds 2.6g/cm 3。
10. The ultra-high density drilling fluid as claimed in claim 2, wherein the nano-scale modified spherical iron oxide particles have a feeding speed of 10 to 40Hz, a high-pressure oxygen delivery rate of 110 to 190m3/h, a primary combustion oxygen amount of 550 to 660m3/h, a natural gas amount of 220 to 330m3/h, and an oxygen enrichment factor of 1.0 to 1.3.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2304897A1 (en) * | 1973-02-01 | 1974-08-22 | Metallgesellschaft Ag | Loaded borehole flushing fluids - contg. rounded grains of iron oxide, giving less abrasion and slower sedimentation |
| CN102127406A (en) * | 2010-12-16 | 2011-07-20 | 江苏傲伦达科技实业股份有限公司 | Filtration-reducing agent for synthetic polymer oil-well cement |
| CN106753280A (en) * | 2016-12-30 | 2017-05-31 | 天津泽希矿产加工有限公司 | A kind of spherical alumina iron and spherical alumina iron are the VHD drilling fluid of heavy weight additive |
-
2022
- 2022-03-03 CN CN202210205289.5A patent/CN114702944A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2304897A1 (en) * | 1973-02-01 | 1974-08-22 | Metallgesellschaft Ag | Loaded borehole flushing fluids - contg. rounded grains of iron oxide, giving less abrasion and slower sedimentation |
| CN102127406A (en) * | 2010-12-16 | 2011-07-20 | 江苏傲伦达科技实业股份有限公司 | Filtration-reducing agent for synthetic polymer oil-well cement |
| CN106753280A (en) * | 2016-12-30 | 2017-05-31 | 天津泽希矿产加工有限公司 | A kind of spherical alumina iron and spherical alumina iron are the VHD drilling fluid of heavy weight additive |
Non-Patent Citations (1)
| Title |
|---|
| 马振友等, 中医古籍出版社 * |
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