CN114276792A - Drilling fluid system and preparation method thereof - Google Patents
Drilling fluid system and preparation method thereof Download PDFInfo
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- CN114276792A CN114276792A CN202210004605.2A CN202210004605A CN114276792A CN 114276792 A CN114276792 A CN 114276792A CN 202210004605 A CN202210004605 A CN 202210004605A CN 114276792 A CN114276792 A CN 114276792A
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- 238000005553 drilling Methods 0.000 title claims abstract description 92
- 239000012530 fluid Substances 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 87
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000314 lubricant Substances 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 27
- 229920000642 polymer Polymers 0.000 claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 14
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 14
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 5
- 229910001424 calcium ion Inorganic materials 0.000 claims description 5
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000005054 agglomeration Methods 0.000 claims description 4
- 230000002776 aggregation Effects 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 abstract description 7
- 239000004927 clay Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 4
- 238000013467 fragmentation Methods 0.000 abstract description 3
- 238000006062 fragmentation reaction Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000005461 lubrication Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 12
- 239000007789 gas Substances 0.000 description 6
- 230000001050 lubricating effect Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 241000124033 Salix Species 0.000 description 3
- 229920006318 anionic polymer Polymers 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000000887 hydrating effect Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005411 Van der Waals force Methods 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229920000831 ionic polymer Polymers 0.000 description 2
- 229920002907 Guar gum Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical group 0.000 description 1
- 229920000891 common polymer Polymers 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Lubricants (AREA)
Abstract
The invention discloses a drilling fluid system which comprises the following components in parts by mass: 100 parts of water; 0.1-0.2 parts of sodium hydroxide; 0.1-0.2 parts of sodium carbonate; 0.2-0.5 part of zwitterionic polymer coating agent; 0.2-0.3 part of zwitterionic viscosity reducer; 0.1-0.3 parts of sodium carboxymethyl cellulose; 0.5-1.0 part of a novel lubricant; 1.0-3.0 parts of collapse-preventing agent, and also discloses a preparation method of the drilling fluid system, the drilling fluid system is suitable for the technical field of development and drilling of coal bed gas horizontal wells, the drilling fluid system has large and stable adsorption capacity on a mudstone well section, can neutralize electronegativity on the mudstone surface, weakens adsorption effect of clay particles on polar water molecules, can effectively prevent fragmentation collapse and coal bed collapse caused by mudstone section stripping, prevents complex conditions in a well from occurring, ensures normal construction, has good water loss wall building property and reservoir protection capability, is simple and cheap in raw materials, greatly reduces cost and manpower, and further improves lubrication collapse-preventing performance.
Description
Technical Field
The invention belongs to the technical field of coal bed gas horizontal well development and drilling, and particularly relates to a drilling fluid system and a preparation method thereof.
Background
At present, in the coal bed gas exploration and development field in China, anionic polymer drilling fluid is generally taken as a main component, but the drilling fluid system has the defects of high drilling cost, high labor intensity, weak drilling fluid inhibition capacity and difficult control of fluid loss; the quality of mud cakes is poor, the well wall is unstable and easy to collapse, and the problems of long underground complex well construction period and the like are caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a drilling fluid system and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a drilling fluid system comprises the following components in parts by mass:
100 parts of water;
0.1-0.2 parts of sodium hydroxide;
0.1-0.2 parts of sodium carbonate;
0.2-0.5 part of zwitterionic polymer coating agent;
0.2-0.3 part of zwitterionic viscosity reducer;
0.1-0.3 parts of sodium carboxymethyl cellulose;
0.5-1.0 part of a novel lubricant;
1.0-3.0 parts of an anti-collapse agent.
Preferably, the zwitterionic polymer coating agent is FA-367.
Preferably, the model of the zwitterionic viscosity reducer is XY-27.
Preferably, the carboxymethyl cellulose sodium salt is HV-CMC in type number.
Preferably, the novel lubricant is RH-3.
Preferably, the anti-collapse agent is FT-342.
Also disclosed is a method for preparing a drilling fluid system, comprising the steps of:
the method comprises the following steps: adding the sodium hydroxide and the sodium carbonate into the water according to the formula amount, and stirring until the sodium hydroxide and the sodium carbonate are dissolved;
step two: then adding the formula amount of the zwitterionic polymer coating agent, the formula amount of the zwitterionic viscosity reducer and the formula amount of the sodium carboxymethyl cellulose, and stirring for 0.5-2.0h to uniformly disperse the materials;
step three: standing for 0.5h, adding the anti-collapse agent and the novel lubricant in the formula amount, and stirring for 0.5-1.0h to uniformly disperse the materials to obtain the drilling fluid system.
Preferably, in the first step, the formula amount of sodium hydroxide and the formula amount of sodium carbonate are added into the formula amount of water and stirred until the sodium hydroxide and the sodium carbonate are dissolved, and the purpose is as follows: treating calcium and magnesium ions in the water, and adjusting the pH value to 8-10.
Preferably, in the second step, the stirrer of the slurry mixing tank meets the slurry mixing requirement, the rotating speed is not lower than 70r/min, and no dead angle is left in the slurry mixing tank; after the addition is finished, stirring is carried out until no agglomeration exists in the system, and the funnel viscosity reaches 35-45 s.
Preferably, in the third step, after standing for 0.5h, the anti-collapse agent and the novel lubricant in the formula amount are added, and the mixture is stirred for 0.5-1.0h to uniformly disperse the materials, so that the drilling fluid system is obtained, and comprises the following steps:
and (3) standing the system for 0.5h after the second step is completed to fully disperse and hydrate the material, adding an anti-collapse agent and a novel lubricant through a feeding funnel, uniformly stirring, and obtaining the drilling fluid system, wherein no agglomeration exists in the system, no oil film floats on the surface, and the drilling fluid filtration loss is 4-8 mL.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the invention, the drilling fluid system has large and stable adsorption capacity on the mudstone well section, can neutralize electronegativity on the surface of the mudstone, weaken adsorption effect of clay particles on polar water molecules, can effectively prevent fragmentation collapse and coal bed collapse caused by mudstone section stripping, prevent complex conditions in the well from occurring, ensure normal construction, and has good water loss wall building property and reservoir protection capability, the raw materials are simple and cheap, the cost and manpower are greatly reduced, and the lubricating anti-collapse performance is further improved.
Detailed Description
The following will further illustrate a specific embodiment of a drilling fluid system and a preparation method thereof according to the present invention with reference to experimental example 1. A drilling fluid system and method of making the same of the present invention is not limited to the description of the examples below.
Example 1:
this example provides a specific implementation of a drilling fluid system, which includes the following components in mass fraction:
100 parts of water;
0.1 part of sodium hydroxide;
0.1 part of sodium carbonate;
0.2 part of zwitterionic polymer coating agent;
0.2 part of zwitterionic viscosity reducer;
0.1 part of sodium carboxymethyl cellulose;
0.5 part of a novel lubricant;
1.0 part of an anti-collapse agent.
Further, the zwitterionic polymer coating agent is FA-367.
Further, the model of the zwitterionic viscosity reducer is XY-27.
Further, the carboxymethyl cellulose sodium salt type number is HV-CMC.
Further, the novel lubricant is RH-3.
Further, the anti-collapse agent is FT-342.
Example 2:
this example shows a specific embodiment of a drilling fluid system, which is similar to example 1 in other components, in mass fraction, including the following components:
100 parts of water;
0.15 part of sodium hydroxide;
0.15 part of sodium carbonate;
0.3 part of zwitterionic polymer coating agent;
0.25 part of zwitterionic viscosity reducer;
0.2 part of sodium carboxymethyl cellulose;
0.7 part of a novel lubricant;
2.0 parts of an anti-collapse agent.
Example 3:
this example shows a specific embodiment of a drilling fluid system, which is similar to example 1 in other components, in mass fraction, including the following components:
100 parts of water;
0.2 part of sodium hydroxide;
0.2 part of sodium carbonate;
0.5 part of zwitterionic polymer coating agent;
0.3 part of zwitterionic viscosity reducer;
0.3 part of sodium carboxymethyl cellulose;
1.0 part of a novel lubricant;
3.0 parts of an anti-collapse agent.
Example 4:
this example presents a specific embodiment of a method for preparing a drilling fluid system for preparing the drilling fluid systems described in examples 1-3, comprising the steps of:
the method comprises the following steps: adding the sodium hydroxide and the sodium carbonate into the water according to the formula amount, and stirring until the sodium hydroxide and the sodium carbonate are dissolved;
step two: then adding the formula amount of the zwitterionic polymer coating agent, the formula amount of the zwitterionic viscosity reducer and the formula amount of the sodium carboxymethyl cellulose, and stirring for 0.5h to uniformly disperse the materials;
step three: standing for 0.5h, adding the anti-collapse agent and the novel lubricant in the formula amount, and stirring for 0.5h to uniformly disperse the materials to obtain the drilling fluid system.
Further, in the first step, the formula amount of sodium hydroxide and the formula amount of sodium carbonate are added into the formula amount of water and stirred until the sodium hydroxide and the sodium carbonate are dissolved, and the purpose is as follows: calcium and magnesium ions in the water are treated and the pH value is adjusted to 8.
Further, in the second step, the stirrer of the slurry mixing tank meets the slurry mixing requirement, the rotating speed is not lower than 70r/min, and no dead angle is left in the slurry mixing tank; after the addition was complete, the mixture was stirred until no lumps were present in the system and the funnel viscosity reached 35 s.
Further, in the third step, after standing for 0.5h, adding an anti-collapse agent and a novel lubricant in a formula amount, and stirring for 0.5h to uniformly disperse the materials to obtain the drilling fluid system, wherein the drilling fluid system comprises:
and (3) standing the system for 0.5h after the second step is completed, fully dispersing and hydrating the material, adding the anti-collapse agent and the novel lubricant through the feeding funnel, uniformly stirring, and obtaining the drilling fluid system, wherein no caking exists in the system, no oil film floats on the surface, and the drilling fluid filtration loss is 4 mL. A
Example 5:
this example presents a specific embodiment of a method for preparing a drilling fluid system for preparing the drilling fluid systems described in examples 1-3, comprising the steps of:
the method comprises the following steps: adding the sodium hydroxide and the sodium carbonate into the water according to the formula amount, and stirring until the sodium hydroxide and the sodium carbonate are dissolved;
step two: then adding the formula amount of the zwitterionic polymer coating agent, the formula amount of the zwitterionic viscosity reducer and the formula amount of the sodium carboxymethyl cellulose, and stirring for 1.0h to uniformly disperse the materials;
step three: standing for 0.5h, adding the anti-collapse agent and the novel lubricant in the formula amount, and stirring for 0.8h to uniformly disperse the materials to obtain the drilling fluid system.
Further, in the first step, the formula amount of sodium hydroxide and the formula amount of sodium carbonate are added into the formula amount of water and stirred until the sodium hydroxide and the sodium carbonate are dissolved, and the purpose is as follows: calcium and magnesium ions in the water are treated and the pH value is adjusted to 9.
Further, in the second step, the stirrer of the slurry mixing tank meets the slurry mixing requirement, the rotating speed is not lower than 70r/min, and no dead angle is left in the slurry mixing tank; after the addition was complete, the mixture was stirred until no lumps were present in the system and the funnel viscosity reached 40 s.
Further, in the third step, after standing for 0.5h, adding an anti-collapse agent and a novel lubricant in a formula amount, and stirring for 0.8h to uniformly disperse the materials to obtain the drilling fluid system, wherein the drilling fluid system comprises:
and (3) standing the system for 0.5h after the second step is completed, fully dispersing and hydrating the material, adding the anti-collapse agent and the novel lubricant through the feeding funnel, uniformly stirring, and obtaining the drilling fluid system, wherein no caking exists in the system, no oil film floats on the surface, and the drilling fluid filtration loss is 6 mL.
Example 6:
this example presents a specific embodiment of a method for preparing a drilling fluid system for preparing the drilling fluid systems described in examples 1-3, comprising the steps of:
the method comprises the following steps: adding the sodium hydroxide and the sodium carbonate into the water according to the formula amount, and stirring until the sodium hydroxide and the sodium carbonate are dissolved;
step two: then adding the formula amount of the zwitterionic polymer coating agent, the formula amount of the zwitterionic viscosity reducer and the formula amount of the sodium carboxymethyl cellulose, and stirring for 2.0 hours to uniformly disperse the materials;
step three: standing for 0.5h, adding the anti-collapse agent and the novel lubricant in the formula amount, and stirring for 1.0h to uniformly disperse the materials to obtain the drilling fluid system.
Further, in the first step, the formula amount of sodium hydroxide and the formula amount of sodium carbonate are added into the formula amount of water and stirred until the sodium hydroxide and the sodium carbonate are dissolved, and the purpose is as follows: calcium and magnesium ions in the water are treated and the pH is adjusted to 10.
Further, in the second step, the stirrer of the slurry mixing tank meets the slurry mixing requirement, the rotating speed is not lower than 70r/min, and no dead angle is left in the slurry mixing tank; after the addition was complete, the mixture was stirred until no lumps were present in the system and the funnel viscosity reached 45 s.
Further, in the third step, after standing for 0.5h, adding an anti-collapse agent and a novel lubricant in a formula amount, and stirring for 1.0h to uniformly disperse the materials to obtain the drilling fluid system, wherein the drilling fluid system comprises:
and (3) standing the system for 0.5h after the second step is completed, fully dispersing and hydrating the material, adding the anti-collapse agent and the novel lubricant through the feeding funnel, uniformly stirring, and obtaining the drilling fluid system, wherein no caking exists in the system, no oil film floats on the surface, and the drilling fluid filtration loss is 8 mL.
Example 7:
the embodiment provides a specific implementation manner of a drilling fluid system preparation method, taking a certain area of Shanxi willow forest coal bed gas and two L-shaped horizontal wells on the same platform as an example, the method comprises the following steps:
adding 0.1 part of sodium hydroxide into 100 parts of water, stirring until the sodium hydroxide is dissolved, adding 0.2 part of zwitterionic polymer coating agent, 0.2 part of zwitterionic viscosity reducer and 0.1 part of sodium carboxymethyl cellulose through a feeding funnel, fully stirring for 1h, adjusting the viscosity of a system funnel to 39s, standing for 0.5h, adding 1.0 part of anti-collapse agent, and fully stirring 1.0 part of novel lubricant for 0.5h to form a drilling fluid system. In the drilling process, 0.75 part of zwitterionic polymer coating agent and 0.25 part of zwitterionic viscosity reducer are added into 100 parts of water to prepare a glue solution which is added into a system to maintain the stability of the system. The viscosity of the drilling funnel of the open hole is 37-42s, the filtration loss is 5.6-7.2mL, the well completion depth is 1980m, the average mechanical drilling speed is 12.31m/h, the friction resistance is 10-17kN, and the average cost per meter is 31.8 yuan. The whole well has no complex accident and is smooth when being tripped out.
Example 8:
the embodiment provides a specific implementation manner of a drilling fluid system preparation method, taking a certain area of Shanxi willow forest coal bed gas and two L-shaped horizontal wells on the same platform as an example, the method comprises the following steps:
adding 0.1 part of sodium carbonate and 0.1 part of sodium hydroxide into 100 parts of water, stirring until the sodium carbonate and the sodium hydroxide are dissolved, adding 0.3 part of zwitterionic polymer coating agent, 0.2 part of zwitterionic viscosity reducer and 0.2 part of sodium carboxymethyl cellulose through a feeding funnel, fully stirring for 2 hours, adjusting the viscosity of a system funnel to 42s, standing for 0.5 hour, adding 1.5 parts of anti-collapse agent, and fully stirring 1.0 part of novel lubricant for 0.5 hour to form a drilling fluid system. In the drilling process, 0.6 part of zwitterionic polymer coating agent, 0.15 part of zwitterionic viscosity reducer and 0.25 part of sodium carboxymethyl cellulose are added into 100 parts of water to prepare a glue solution which is added into a system to maintain the stability of the system. The viscosity of the drilling funnel of the well is 39-45s, the filtration loss is 4.4-6.6mL, the well completion depth is 2200m, the average mechanical drilling speed is 12.31m/h, the friction is 12-20kN, and the average cost per meter is 35.3 yuan. The whole well has no complex accident and is smooth when being tripped out.
Experimental example 1:
compared with other systems of drilling fluid in the same block through indoor experiments, the zwitterionic polymer drilling fluid has more excellent performance. System No. 1 is the zwitterionic polymer drilling fluid of example 7; the No. 2 system is an anionic polymer drilling fluid system; the No. 3 system is a guar gum drilling fluid system. The results of the experiment are shown in table 1. Compared with other drilling fluid systems, the zwitterionic polymer drilling fluid system disclosed by the invention has better rheological property, lower filtration loss and more excellent inhibitive performance, and indoor experiments show that 1% of novel lubricant RH-3 is added, the mud cake adhesion coefficient is reduced from 0.277 to 0.176, and the system has good lubricity.
The amphoteric ionic polymer drilling fluid has the advantages that various technical indexes of the performance are easy to control, the amphoteric ionic polymer drilling fluid can meet design requirements, the field well wall is stable and has less blocks, the system is proved to have a strong anti-collapse effect, two wells are smoothly drilled after being tripped out, complex conditions in the holes are avoided, the smooth construction is effectively guaranteed, the system is proved to have strong lubricating and anti-blocking performance, the average mechanical drilling speed is 12.31m/h, the mechanical drilling speed is improved by about 5-10% compared with that of other drilling fluid systems used in the same block, and the construction progress is greatly improved.
And (3) economic analysis:
the cost of the drilling fluid is reduced to 33.5 yuan per meter by using the zwitterionic polymer, and is saved by 50-60 percent compared with the cost of the drilling fluid in the same block. From the viewpoint of comprehensive benefits, the method has strong popularization value.
TABLE 1
Compared with the common anionic polymer drilling fluid, the invention has the obvious advantages that:
the molecular chain of the main treating agent FA-367 of the zwitterionic polymer drilling fluid simultaneously has an anionic group and a cationic group, and the cationic group and clay particles with negative charges on the surface of the mudstone have van der Waals force and stronger electrostatic attraction, so that the adsorption quantity on a mudstone well section is large and stable, the defect of poor stability caused by the fact that the common polymer drilling fluid has electronegativity and is adsorbed on the surface of the clay through hydrogen bonds and van der Waals force is overcome, and meanwhile, when FA-367 molecules enter a stratum along with filtrate, the electronegativity on the surface of the mudstone can be neutralized, and the adsorption action of the clay particle position on polar water molecules is weakened. The method can effectively prevent fragmentation collapse and coal bed collapse caused by mudstone section spalling and prevent complex conditions in the well from occurring. And the normal operation of construction is ensured.
The water loss wall building property and the reservoir protection capability are good:
the existence of the cation group leads the mud to have stronger inhibition. Such asThe inhibition effect is not only effective on the well wall, but also effective on rock debris captured in the drilling process. In the mud system, the hydration and dispersion of the rock debris are effectively controlled, and the rock debris is removed through the selective flocculation of the polymer and the mechanical sedimentation of large ground pits. The density of the slurry is prevented from increasing, the condition that the quality of the mud cake is reduced due to the existence of harmful solid phases is lightened, and the filtration loss of the slurry is effectively controlled. The mass adsorption of the high molecular polymer on the well wall has important significance for improving the quality of mud cakes, further reducing water loss and protecting the block coal bed gas in the Shanxi willow coal bed gas area. Meanwhile, as the density, the water loss and the mud cake quality are improved, the mud rock section (the penetration amount is about 30-70 m)3Day) development over large periods of time with greatly reduced risk of differential pressure (mudcake sticking) sticking.
The lubricating anti-collapse performance after modification is further improved:
because the open hole section is long, the quality of the drilling tool is almost equal to the rated lifting capacity of the drilling machine, the mud is required to have good lubricity, the friction coefficient between the drilling tool and the well wall is reduced, and the safety of machinery and the well is ensured. In order to meet the requirement, the mud is modified properly, and modified sulfonated asphalt powder is added to protect the wall and RH-3 novel lubricant to enhance the anti-sloughing lubricating performance of the drilling fluid; the RH-3 novel lubricant is dispersed in the slurry, and can form a layer of oil film on the surface of the slurry cake, so that the friction coefficient of the slurry cake is reduced, and the anti-blocking effect is good; the construction risk is reduced.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A drilling fluid system is characterized by comprising the following components in parts by mass:
100 parts of water;
0.1-0.2 parts of sodium hydroxide;
0.1-0.2 parts of sodium carbonate;
0.2-0.5 part of zwitterionic polymer coating agent;
0.2-0.3 part of zwitterionic viscosity reducer;
0.1-0.3 parts of sodium carboxymethyl cellulose;
0.5-1.0 part of a novel lubricant;
1.0-3.0 parts of an anti-collapse agent.
2. The drilling fluid system of claim 1, wherein the zwitterionic polymer coating is FA-367.
3. The drilling fluid system of claim 1, wherein the zwitterionic viscosity reducer is XY-27.
4. The drilling fluid system of claim 1, wherein the carboxymethyl cellulose sodium salt type number is HV-CMC.
5. The drilling fluid system of claim 1, wherein the new lubricant is RH-3.
6. The drilling fluid system of claim 1, wherein the anti-sloughing agent is of type FT-342.
7. A method of preparing a drilling fluid system, comprising the steps of:
the method comprises the following steps: adding the sodium hydroxide and the sodium carbonate into the water according to the formula amount, and stirring until the sodium hydroxide and the sodium carbonate are dissolved;
step two: then adding the formula amount of the zwitterionic polymer coating agent, the formula amount of the zwitterionic viscosity reducer and the formula amount of the sodium carboxymethyl cellulose, and stirring for 0.5-2.0h to uniformly disperse the materials;
step three: standing for 0.5h, adding the anti-collapse agent and the novel lubricant in the formula amount, and stirring for 0.5-1.0h to uniformly disperse the materials to obtain the drilling fluid system.
8. The method of claim 7, wherein in step one, the formula amount of sodium hydroxide and the formula amount of sodium carbonate are added to the formula amount of water and stirred until dissolved, and the purpose is to: treating calcium and magnesium ions in the water, and adjusting the pH value to 8-10.
9. The preparation method of the drilling fluid system according to claim 7, wherein in the second step, the agitator of the slurry preparation tank meets the slurry preparation requirement, the rotating speed is not lower than 70r/min, and no dead angle is left in the slurry preparation tank; after the addition is finished, stirring is carried out until no agglomeration exists in the system, and the funnel viscosity reaches 35-45 s.
10. The preparation method of the drilling fluid system according to claim 7, wherein in the third step, the anti-collapse agent and the novel lubricant are added after standing for 0.5h, and the mixture is stirred for 0.5-1.0h to uniformly disperse the materials, so as to obtain the drilling fluid system, which comprises the following steps:
and (3) standing the system for 0.5h after the second step is completed to fully disperse and hydrate the material, adding an anti-collapse agent and a novel lubricant through a feeding funnel, uniformly stirring, and obtaining the drilling fluid system, wherein no agglomeration exists in the system, no oil film floats on the surface, and the drilling fluid filtration loss is 4-8 mL.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115595128A (en) * | 2022-08-25 | 2023-01-13 | 延长油田股份有限公司（Cn） | Low-cost low-friction drilling fluid suitable for shallow horizontal well and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104673256A (en) * | 2013-12-03 | 2015-06-03 | 北京石大博诚科技有限公司 | Weak gel system for drilling fluid |
| CN111087980A (en) * | 2018-10-24 | 2020-05-01 | 中国石油天然气股份有限公司 | Drilling fluid and preparation method and application thereof |
| CN112111255A (en) * | 2020-11-03 | 2020-12-22 | 中国石油化工股份有限公司 | Additive for water-based drilling fluid, environment-friendly water-based drilling fluid and preparation method of environment-friendly water-based drilling fluid |
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2022
- 2022-01-04 CN CN202210004605.2A patent/CN114276792A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104673256A (en) * | 2013-12-03 | 2015-06-03 | 北京石大博诚科技有限公司 | Weak gel system for drilling fluid |
| CN111087980A (en) * | 2018-10-24 | 2020-05-01 | 中国石油天然气股份有限公司 | Drilling fluid and preparation method and application thereof |
| CN112111255A (en) * | 2020-11-03 | 2020-12-22 | 中国石油化工股份有限公司 | Additive for water-based drilling fluid, environment-friendly water-based drilling fluid and preparation method of environment-friendly water-based drilling fluid |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115595128A (en) * | 2022-08-25 | 2023-01-13 | 延长油田股份有限公司（Cn） | Low-cost low-friction drilling fluid suitable for shallow horizontal well and preparation method thereof |
| CN115595128B (en) * | 2022-08-25 | 2024-08-16 | 延长油田股份有限公司 | Low-cost low-friction drilling fluid suitable for shallow horizontal well and preparation method thereof |
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Application publication date: 20220405 |