CN108531146B - Drilling leakage-stopping liquid and preparation method thereof - Google Patents
Drilling leakage-stopping liquid and preparation method thereof Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 title abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 46
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 241000208202 Linaceae Species 0.000 claims abstract description 29
- 235000004431 Linum usitatissimum Nutrition 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 19
- 239000002893 slag Substances 0.000 claims abstract description 19
- 239000012190 activator Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000003213 activating effect Effects 0.000 claims abstract description 11
- 239000003381 stabilizer Substances 0.000 claims abstract description 11
- 239000000725 suspension Substances 0.000 claims abstract description 11
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000012986 modification Methods 0.000 claims description 13
- 230000004048 modification Effects 0.000 claims description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- 239000000292 calcium oxide Substances 0.000 claims description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 6
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 6
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 6
- 235000011152 sodium sulphate Nutrition 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 3
- 229910021538 borax Inorganic materials 0.000 claims description 3
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 3
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 3
- 239000001488 sodium phosphate Substances 0.000 claims description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 3
- 235000011008 sodium phosphates Nutrition 0.000 claims description 3
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 3
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 3
- 239000004328 sodium tetraborate Substances 0.000 claims description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 2
- 239000003607 modifier Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 9
- 239000004568 cement Substances 0.000 abstract description 8
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000002343 natural gas well Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 description 10
- 239000002002 slurry Substances 0.000 description 7
- 239000000499 gel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011268 mixed slurry Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000009832 plasma treatment Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a drilling plugging fluid and a preparation method thereof, belonging to the technical field of oil-gas exploration and development, wherein the plugging fluid comprises the following components in parts by weight: 60-150 parts of curing agent, 1-10 parts of bridging agent, 0.5-2 parts of suspension stabilizer, 0.5-5 parts of retarder, 2-10 parts of activator, 2-15 parts of activating auxiliary agent, 10-180 parts of density regulator and 100 parts of water, wherein the curing agent is nickel slag, and the bridging agent is modified flax fiber. The leakage blocking liquid has good fluidity and strong thixotropy, can effectively enter leakage crack channels with different scales, and can be solidified and hardened to form strength in a short time, and the leakage blocking liquid has good chemical compatibility with drilling fluid and cement paste, high construction safety, a use temperature range of 25-150 ℃ and good temperature resistance. The preparation method is simple and easy to implement, and has good practicability for plugging in the drilling process of petroleum and natural gas wells, coal bed gas wells and shale gas wells.
Description
Technical Field
The invention belongs to the technical field of oil-gas exploration and development, and particularly relates to a drilling plugging fluid and a preparation method thereof.
Background
In wells such as oil and gas wells, coal bed gas wells, shale gas wells and the like, complex geological conditions are often encountered, conditions such as fault development, serious stratum breakage, weak bearing capacity and the like occur, under the conditions, in the drilling process, when the drilling fluid is high in density, high in viscosity and poor in flowing capacity, well leakage often occurs, in the operation processes of casing running, hole scratching and cement injection, due to exciting pressure generated by high-viscosity slurry, additional pressure can be generated in the wells, and then leakage is caused again. Lost circulation is classified into four categories according to the cause of the lost circulation: permeability leakage, fracture leakage, karst cave leakage and fracture leakage. For a well with well leakage, the well drilling, well cementation and well completion can be smoothly carried out only by using the leakage plugging fluid for plugging, wherein the leakage plugging fluid can well enter a stratum and stay in the stratum, and the key of successful plugging is.
A great deal of research is also carried out at home and abroad on the plugging materials and the related technologies of leakage prevention and plugging, and the following types are mainly available: bridge plugs, high water loss, chemical gels, inorganic gel plugging fluids and the like. Among them, the most common are bridge plug plugging and gel plugging. The technical principle of bridge plug plugging is as follows: adding inert materials such as particles, sheets and fibers with different shapes and sizes into the drilling fluid to prepare composite plugging slurry, pumping the composite plugging slurry into a stratum, forming a net-shaped bridge at the place where cracks and pores in the stratum are staggered and extended, embedding and plugging tiny pores by small particle materials or sheet materials and fibers to form a bridge and a slug with high filling filtration loss, and quickly losing water in a solid phase in the subsequent drilling fluid to form a compact closed slug so as to achieve the aim of plugging. The gel plugging is to make the polymer form bonding at the interface, absorb water and swell in the leakage channel, the macromolecule chain between the cross-linking points changes from a curling shape into a stretching shape, and different reversible deformations are generated according to different external forces, thus playing the role of increasing resistance and reducing leakage. However, these plugging techniques have the disadvantage that the plugging fluid does not develop sufficient strength to cause new leakages during subsequent drilling.
Therefore, a drilling well plugging fluid which has a good plugging effect and can form high strength after being cured is urgently needed.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a drilling fluid; the second purpose is to provide a preparation method of the drilling plugging fluid.
In order to achieve the purpose, the invention provides the following technical scheme:
1. the drilling well plugging fluid comprises the following components in parts by weight: 60-150 parts of curing agent, 1-10 parts of bridging agent, 0.5-2 parts of suspension stabilizer, 0.5-5 parts of retarder, 2-10 parts of activator, 2-15 parts of activating auxiliary agent, 10-180 parts of density regulator and 100 parts of water; the curing agent is nickel slag, and the bridging agent is modified flax fiber.
Further, the content of CaO in the nickel slag is more than 10 wt%, and SiO in the nickel slag2The content of (b) is more than 40 wt%, and the fineness of the nickel slag is 200-325 meshes.
Further, the preparation method of the modified flax fiber comprises the following steps: and (3) carrying out low-temperature plasma modification on the flax fibers.
Further, the preparation method of the modified flax fiber comprises the following specific steps: placing flax fiber with length of 0.5-3mm into the cavity of low temperature plasma processing instrument, opening vacuum pump, and pressing for 30-50cm when vacuum degree in the cavity is less than 10Pa3Introducing oxygen at the flow of/min, adjusting the power of a high-frequency power supply to 80-120w, and then starting to perform low-temperature plasma modification on the flax fibers, wherein the modification time is 60-300 s.
Further, the suspension stabilizer is hydroxypropyl methyl cellulose or polyvinyl pyrrolidone.
Further, the retarder is one of sodium tetraborate, sodium dihydrogen phosphate, sodium phosphate or sodium polyphosphate.
Further, the activator is formed by mixing sodium hydroxide, sodium carbonate, sodium sulfate and sodium silicate according to the mass ratio of 3-5:1-2:2-3: 3-4.
Further, the activating auxiliary agent is formed by mixing calcium oxide and potassium hydroxide according to the mass ratio of 2-5: 1-3.
Further, the density regulator is one of barite powder for drilling fluid, iron ore powder for well cementation or hollow glass beads.
2. The preparation method of the drilling well plugging fluid comprises the following steps: adding 60-150 parts of curing agent, 1-10 parts of bridging agent, 0.5-2 parts of suspension stabilizer, 0.5-5 parts of retarder, 2-10 parts of activator and 2-15 parts of activating auxiliary agent into 100 parts of water in sequence, stirring for 30-50min at the rotating speed of 300 plus materials 4000r/min, then adding 10-180 parts of density regulator, and continuing stirring for 20-30min at the rotating speed of 300 plus materials 4000 r/min.
The invention has the beneficial effects that: the invention provides a well drilling plugging fluid and a preparation method thereof, the plugging fluid has good fluidity and strong thixotropy, can effectively enter leakage crack channels with different scales, and can be solidified and hardened in a short time to form strength, the compressive strength can reach more than 7.5MPa, the plugging fluid has good chemical compatibility with drilling fluid and cement paste, the construction safety is high, the use temperature range is 25-150 ℃, and the temperature resistance is good. After the plugging liquid is solidified, the modified flax fibers in the plugging liquid have good compatibility and synergistic effect with the nickel ore slag, and the modified flax fibers play a bridging role in the process of forming the gel strength of the nickel ore slag, so that the water-invasion resistance of the nickel ore slag is obviously improved. In addition, the modified flax fibers form a reticular bridge in the leakage crack channel to embed and block micro pores, so that the leakage stopping effect of the leakage stopping liquid is greatly enhanced. Meanwhile, according to the actual conditions of underground temperature, pressure and the like, the setting and hardening time and the thickening time of the plugging fluid are adjusted by adjusting the dosage proportion of the activating agent and the activating auxiliary agent in the plugging fluid. The density of the leakage-stopping liquid can be adjusted by adjusting the dosage of the density regulator in the leakage-stopping liquid according to the underground environmental conditions and the leakage condition, so that the density range is 1.20g/cm3-2.50g/cm3. The leakage blocking liquid takes nickel slag as a raw material, expands the application field of industrial wastes, not only reduces the engineering operation cost, but also is beneficial to environmental protection. The preparation method of the plugging liquid is simple and easy to implement, and has good practicability for plugging in the drilling process of petroleum and natural gas wells, coal bed gas wells and shale gas wells.
Detailed Description
The preferred embodiments of the present invention will be described in detail below.
Example 1
(1) Preparation of modified flax fiber
Cutting a part of the material with a length of 2mmPlacing fibrilia into the cavity of the low-temperature plasma treatment instrument, opening the vacuum pump, and keeping the vacuum degree in the cavity at 45cm when the vacuum degree is less than 10Pa3Introducing oxygen at the flow of/min, adjusting the power of a high-frequency power supply to 120w, and then starting to perform low-temperature plasma modification on the flax fibers, wherein the modification time is 60 s.
(2) Preparation of drilling well plugging fluid
100 parts of CaO, with a content of > 10 wt%, SiO are added to 100 parts of water in sequence2The content of the nickel slag (curing agent) is more than 40 wt% and the fineness of 200-325 meshes, 1 part of the modified flax fiber (bridging agent) prepared in the step (1), 1 part of hydroxypropyl methyl cellulose (suspension stabilizer), 0.5 part of sodium tetraborate (retarder), 2 parts of an activator (formed by mixing sodium hydroxide, sodium carbonate, sodium sulfate and sodium silicate according to the mass ratio of 3:2:2: 3), 2 parts of an activating auxiliary agent (formed by mixing calcium oxide and potassium hydroxide according to the mass ratio of 2: 3), stirring for 50min at the rotating speed of 300r/min, then adding 100 parts of barite powder (density regulator) for drilling fluid, and continuously stirring for 30min at the rotating speed of 300 r/min.
Example 2
(1) Preparation of modified flax fiber
Placing flax fiber with length of 1mm into a cavity of a low-temperature plasma treatment instrument, opening a vacuum pump, and keeping the vacuum degree in the cavity at 40cm when the vacuum degree is less than 10Pa3Introducing oxygen at the flow of/min, adjusting the power of a high-frequency power supply to be 100w, and then starting to perform low-temperature plasma modification on the flax fibers, wherein the modification time is 100 s.
(2) Preparation of drilling well plugging fluid
Adding 150 parts of CaO with the content of more than 10 wt% and SiO into 100 parts of water in turn2The content of the nickel slag (curing agent) is more than 40 wt% and the fineness of 200-325 meshes, 10 parts of modified flax fiber (bridging agent) prepared in the step (1), 2 parts of hydroxypropyl methyl cellulose (suspension stabilizer), 5 parts of sodium polyphosphate (retarder), 10 parts of activator (formed by mixing sodium hydroxide, sodium carbonate, sodium sulfate and sodium silicate according to the mass ratio of 3:1:2: 3), 15 parts of activating auxiliary agent (formed by mixing calcium oxide and potassium hydroxide according to the mass ratio of 5: 1), stirring for 40min at the rotating speed of 2000r/min, then adding 30 parts of hollow glass beads (density regulator), and continuing to stir at 2000r/minStirring at rotating speed for 25 min.
Example 3
(1) Preparation of modified flax fiber
Placing flax fiber with length of 0.5mm into the cavity of low temperature plasma processing instrument, opening the vacuum pump, and keeping the vacuum degree in the cavity at less than 10Pa by 50cm3Introducing oxygen at the flow of/min, adjusting the power of a high-frequency power supply to 80w, and then starting to perform low-temperature plasma modification on the flax fibers, wherein the modification time is 300 s.
(2) Preparation of drilling well plugging fluid
60 parts of CaO, with a content of > 10 wt%, SiO are added to 100 parts of water in sequence2The content of the nickel slag (curing agent) is more than 40 wt% and the fineness of 200-325 meshes, 8 parts of the modified flax fiber (bridging agent) prepared in the step (1), 0.5 part of hydroxypropyl methyl cellulose (suspension stabilizer), 2 parts of sodium dihydrogen phosphate (retarder), 8 parts of activator (formed by mixing sodium hydroxide, sodium carbonate, sodium sulfate and sodium silicate according to the mass ratio of 5:1:3: 4), 8 parts of activator (formed by mixing calcium oxide and potassium hydroxide according to the mass ratio of 4: 3), stirring for 30min at the rotating speed of 4000r/min, then adding 180 parts of iron ore powder (density regulator) for well cementation, and continuously stirring for 20min at the rotating speed of 4000 r/min.
Example 4
(1) Preparation of modified flax fiber
Placing flax fiber with length of 3mm into the cavity of low temperature plasma processing instrument, opening the vacuum pump, and pressing for 30cm when vacuum degree in the cavity is less than 10Pa3Introducing oxygen at the flow of/min, adjusting the power of a high-frequency power supply to 90w, and then starting to perform low-temperature plasma modification on the flax fibers, wherein the modification time is 200 s.
(2) Preparation of drilling well plugging fluid
Adding 120 parts of CaO with the content of more than 10 wt% and SiO into 100 parts of water in turn2The content of the nickel slag (curing agent) is more than 40 wt% and the fineness of the nickel slag is 200-325 meshes, 5 parts of the modified flax fiber (bridging agent) prepared in the step (1), 1 part of hydroxypropyl methyl cellulose (suspension stabilizer), 1 part of sodium phosphate (retarder), 5 parts of activator (formed by mixing sodium hydroxide, sodium carbonate, sodium sulfate and sodium silicate according to the mass ratio of 4:1:2: 4),and (2) stirring 12 parts of an activating auxiliary agent (formed by mixing calcium oxide and potassium hydroxide according to the mass ratio of 3: 2) at the rotating speed of 3000r/min for 40min, then adding 10 parts of hollow glass beads (density regulators), and continuously stirring at the rotating speed of 3000r/min for 25min to obtain the activated carbon.
The application properties of the drilling plugging fluid prepared in the examples 1-4 are tested according to the method for testing the performance of the cement slurry in the national standard GB/T19139-. The drilling fluid prepared in examples 1-4 was tested for compatibility with cement slurries and drilling fluid mixtures according to the chinese national standard GB/T19139-2012 "oil well cement test methods", and the results are shown in table 2.
Table 1 results of various performance tests on the well plugging fluid prepared in examples 1-4
As can be seen from Table 1, the drilling plugging fluids prepared in examples 1-4 have good plugging effects, can realize curing properties, and the strength of the cured body can be higher than 7.5MPa, which can ensure that the bearing capacity of the stratum after plugging is greatly improved.
Table 2 compatibility of drilling plugging fluids prepared in examples 1-4 with drilling fluids and cement slurries the results of the performance tests
As can be seen from Table 2, the drilling plugging fluids prepared in examples 1-4 have good compatibility with drilling fluids and cement slurries, and the normal temperature fluidity and the high temperature fluidity of the mixed slurries with different proportions are both greater than 16cm, so that the mixed slurries have good fluidity. Therefore, when the drilling leakage-stopping liquid is applied, the construction safety can be ensured.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (6)
1. The drilling well plugging fluid is characterized by comprising the following components in parts by weight: 60-150 parts of curing agent, 1-10 parts of bridging agent, 0.5-2 parts of suspension stabilizer, 0.5-5 parts of retarder, 2-10 parts of activator, 2-15 parts of activating auxiliary agent, 10-180 parts of density regulator and 100 parts of water; the curing agent is nickel ore slag, the content of CaO in the nickel ore slag is more than 10 wt%, and SiO is contained in the nickel ore slag2The content of the nickel slag is more than 40wt percent, and the fineness of the nickel slag is 200-325 meshes; the bridging agent is modified flax fiber; the preparation method of the modified flax fiber comprises the following steps: placing flax fiber with length of 0.5-3mm into the cavity of low temperature plasma processing instrument, opening vacuum pump, and pressing for 30-50cm when vacuum degree in the cavity is less than 10Pa3Introducing oxygen at the flow of/min, adjusting the power of a high-frequency power supply to 80-120w, and then starting to perform low-temperature plasma modification on the flax fibers, wherein the modification time is 60-300 s; the suspension stabilizer is hydroxypropyl methyl cellulose or polyvinyl pyrrolidone.
2. The drilling fluid plugging fluid of claim 1 wherein said retarder is one of sodium tetraborate, sodium dihydrogen phosphate, sodium phosphate or sodium polyphosphate.
3. The wellbore plugging fluid of claim 1, wherein said activator is a mixture of sodium hydroxide, sodium carbonate, sodium sulfate and sodium silicate in a mass ratio of 3-5:1-2:2-3: 3-4.
4. The wellbore plugging fluid of claim 1, wherein said co-agent is a mixture of calcium oxide and potassium hydroxide in a mass ratio of 2-5: 1-3.
5. The drilling fluid plugging fluid of claim 1, wherein the density modifier is one of barite powder for drilling fluid, iron ore powder for well cementation or hollow glass beads.
6. The method for preparing the well drilling plugging fluid according to any one of the claims 1 to 5, wherein the method is characterized by comprising the following steps: adding 60-150 parts of curing agent, 1-10 parts of bridging agent, 0.5-2 parts of suspension stabilizer, 0.5-5 parts of retarder, 2-10 parts of activator and 2-15 parts of activating auxiliary agent into 100 parts of water in sequence, stirring for 30-50min at the rotating speed of 300 plus materials 4000r/min, then adding 10-180 parts of density regulator, and continuing stirring for 20-30min at the rotating speed of 300 plus materials 4000 r/min.
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| CN109488212B (en) * | 2018-10-23 | 2020-02-14 | 滦平县伟源矿业有限责任公司 | Drilling and completion method in shale reservoir in drilling engineering |
| CN110903814A (en) * | 2019-12-20 | 2020-03-24 | 东营泰尔石油技术有限公司 | Anti-leakage plugging suspension carrying agent |
| CN112342001B (en) * | 2020-11-30 | 2022-11-18 | 中国石油天然气集团有限公司 | Plugging agent and plugging slurry for oil-based drilling fluid and preparation method of plugging agent and plugging slurry |
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Inventor after: Li Yanming Inventor after: Cui Gangming Inventor after: Kong Wei Inventor after: Li Chengxin Inventor after: Xu Shubin Inventor after: Wang Qingfeng Inventor after: Guo Zhijun Inventor after: Pan Xiaoye Inventor after: Guo Kunming Inventor after: Xiao Lihui Inventor after: Du Kun Inventor before: Li Yanming Inventor before: Kong Wei Inventor before: Xu Shubin Inventor before: Wang Qingfeng Inventor before: Guo Zhijun Inventor before: Pan Xiaoye Inventor before: Guo Kunming Inventor before: Xiao Lihui Inventor before: Du Kun Inventor before: Cui Gangming |
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Application publication date: 20180914 Assignee: Beiken Energy (Beijing) Co.,Ltd. Assignor: CCTEG CHONGQING RESEARCH INSTITUTE Co.,Ltd. Contract record no.: X2024980003076 Denomination of invention: A drilling plugging fluid and its preparation method Granted publication date: 20210309 License type: Common License Record date: 20240320 |