CN111849431A - Composite plugging material for well drilling and application thereof - Google Patents
Composite plugging material for well drilling and application thereof Download PDFInfo
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- CN111849431A CN111849431A CN202010742512.0A CN202010742512A CN111849431A CN 111849431 A CN111849431 A CN 111849431A CN 202010742512 A CN202010742512 A CN 202010742512A CN 111849431 A CN111849431 A CN 111849431A
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- 238000005553 drilling Methods 0.000 title claims abstract description 125
- 239000000463 material Substances 0.000 title claims abstract description 102
- 239000002131 composite material Substances 0.000 title claims abstract description 73
- 239000012530 fluid Substances 0.000 claims abstract description 45
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 239000002210 silicon-based material Substances 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000010439 graphite Substances 0.000 claims abstract description 20
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 20
- 239000013013 elastic material Substances 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 9
- 239000004917 carbon fiber Substances 0.000 claims description 9
- 229920002379 silicone rubber Polymers 0.000 claims description 9
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 9
- 239000010445 mica Substances 0.000 claims description 8
- 229910052618 mica group Inorganic materials 0.000 claims description 8
- 239000010456 wollastonite Substances 0.000 claims description 8
- 229910052882 wollastonite Inorganic materials 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 229920000459 Nitrile rubber Polymers 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 3
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 3
- 229920001973 fluoroelastomer Polymers 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000004579 marble Substances 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 230000000903 blocking effect Effects 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 2
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- 206010067171 Regurgitation Diseases 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 239000011343 solid material Substances 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241000758789 Juglans Species 0.000 description 2
- 235000009496 Juglans regia Nutrition 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000010428 baryte Substances 0.000 description 2
- 229910052601 baryte Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 239000000411 inducer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 235000020234 walnut Nutrition 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
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- 239000002657 fibrous material Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
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- 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
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
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- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
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Abstract
The invention provides a composite plugging material for well drilling and application thereof, belonging to the technical field of oil and gas field exploration and development plugging. The composite lost circulation material for drilling comprises the following components in parts by weight: 1-2 parts of fiber, 50-70 parts of inorganic silicon material, 15-35 parts of elastic material and 13-14 parts of tough material; the elastic material is elastic graphite. The inorganic silicon material and the tough material in the composite lost circulation material for drilling are used, so that the composite lost circulation material for drilling forms a blocking slug with certain strength under certain pressure to realize blocking; when the elastic graphite is positioned in the crack, the pressure generated by the continuous opening-closing of the crack can be effectively resisted, so that the plugging slug is not damaged, and the occurrence of secondary leakage is avoided. In addition, the composite plugging material for drilling is suitable for water-based drilling fluid and oil-based drilling fluid, and has a wide application range.
Description
Technical Field
The invention relates to the technical field of oil and gas field exploration and development plugging, in particular to a composite plugging material for well drilling and application thereof.
Background
The leakage is a problem frequently encountered in the drilling process, which not only greatly increases the operation cost, but also increases the uncontrollable factors of the drilling operation, and may cause underground complex accidents such as well collapse, blowout and the like. This places high demands on the efficiency of the well plugging technology. The current reasons for failure in plugging are as follows: 1) the strength of the plugging material is insufficient, and the plugging material such as common walnut shells is often crushed by pressure in the plugging process, so that the pressure bearing effect cannot be realized, and the plugging fails; 2) at present, the plugging construction is guided by adopting more stress Cage theory of SCT (stress Cage theory), which is directly expressed as a door sealing phenomenon, generally, the particle size of the plugging material is mainly designed by single large particles, and the plugging part is easy to return and spit under the action of swabbing in the subsequent construction, so that the re-leakage is caused; 3) at present, some theories of blocking the seam and the seam tip are gradually received and applied by people, but the success rate is not ideal, particularly when induced cracks leak, the cracks often generate a breathing effect in the drilling process, the opening and closing actions are repeated, if the selection of the plugging material is not good, the plugging material can be extruded out of the cracks, and the repeated leakage is caused.
Disclosure of Invention
In view of the above, the present invention aims to provide a composite plugging material for drilling and an application thereof. The composite plugging material for drilling provided by the invention can effectively fill and plug cracks and prevent re-flowing and re-leaking.
The invention provides a composite plugging material for well drilling, which comprises the following components in parts by weight: 1-2 parts of fiber, 50-70 parts of inorganic silicon material, 15-35 parts of elastic material and 13-14 parts of tough material; the elastic material is elastic graphite.
Preferably, the length of the fibers is less than or equal to 2 mm.
Preferably, the fiber is one or more of carbon fiber, polyester fiber, aluminum silicate fiber and glass fiber.
Preferably, the particle size of the inorganic silicon material is 10-40 meshes.
Preferably, the inorganic silicon material is one or more of marble, quartz sand, mica sheets and wollastonite.
Preferably, the particle size of the elastic graphite is 20-60 meshes.
Preferably, the compression resistance of the elastic graphite is that the resilience rate is more than or equal to 85 percent after 30MPa compression.
Preferably, the tough material is one or more of nitrile rubber, silicone rubber, styrene butadiene rubber and fluororubber.
The invention also provides the application of the composite plugging material for drilling in the technical scheme in the drilling plugging, wherein the addition amount of the composite plugging material for drilling is 3-6% of the total weight of the drilling fluid.
The invention provides a composite plugging material for well drilling, which comprises the following components in parts by weight: 1-2 parts of fiber, 50-70 parts of inorganic silicon material, 15-35 parts of elastic material and 13-14 parts of tough material; the elastic material is elastic graphite. The inorganic silicon material and the tough material in the composite lost circulation material for drilling are used, so that the composite lost circulation material for drilling forms a blocking slug with certain strength under certain pressure to realize blocking; when the elastic graphite is positioned in the crack, the pressure generated by the continuous opening-closing of the crack can be effectively resisted, so that the plugging slug is not damaged, and the occurrence of secondary leakage is avoided.
The invention also provides the application of the composite plugging material for drilling in the technical scheme in the drilling plugging, wherein the addition amount of the composite plugging material for drilling is 3-6% of the total weight of the drilling fluid. The composite lost circulation material for drilling provided by the invention can be applied to water-based drilling fluid or oil-based drilling fluid, and has no influence on the viscosity of the drilling fluid.
Drawings
FIG. 1 is a photograph of an apparatus for performing an anti-regurgitation test on the composite plugging material for well drilling obtained by the present invention;
FIG. 2 is a schematic diagram of an apparatus for performing anti-regurgitation tests on the composite material for drilling well obtained by the present invention.
Detailed Description
The invention provides a composite plugging material for well drilling, which comprises the following components in parts by weight: 1-2 parts of fiber, 50-70 parts of inorganic silicon material, 15-35 parts of elastic material and 13-14 parts of tough material; the elastic material is elastic graphite.
In the present invention, the starting materials used in the present invention are all commercially available products unless otherwise specified.
The composite plugging material for well drilling comprises 1-2 parts by weight of fibers, preferably 1.2-1.8 parts by weight, more preferably 1.4-1.6 parts by weight, and even more preferably 1.5 parts by weight. In the present invention, the length of the fibers is preferably 2mm or less. In the present invention, the fibers are preferably one or more of carbon fibers, polyester fibers, aluminum silicate fibers, and glass fibers, and are more preferably carbon fibers.
In the invention, the fiber can directly wind the solid phase (the solid phase comprises inorganic silicon material, elastic material and flexible material) together, thereby improving the shearing resistance of the composite plugging material.
The composite plugging material for drilling comprises, by weight, 50-70 parts of inorganic silicon materials, preferably 55-65 parts, and further preferably 60 parts based on the weight parts of fibers. In the invention, the particle size of the inorganic silicon material is preferably 10-40 meshes. In the invention, the inorganic silicon material is preferably one or more of marble, quartz sand, mica sheets and wollastonite, and is further preferably mica sheets, quartz stone and wollastonite; the mass ratio of the mica plate, the quartz stone and the wollastonite in the tough material is preferably 15:30:25, 10:25:25 and 10:20: 20.
According to the invention, the inorganic silicon material can improve the overall strength of the composite plugging material, increase the friction force with the wall surface of the leakage channel and improve the anti-backflow capacity.
The composite plugging material for well drilling comprises, by weight, 15-35 parts of an elastic material, preferably 20-30 parts of an elastic material, and further preferably 25 parts of an elastic graphite material, wherein the weight parts of the fiber are taken as a reference; the particle size of the elastic graphite is preferably 20-60 meshes. In the invention, the compression resistance of the elastic graphite is that the resilience rate is more than or equal to 85 percent after 30MPa compression.
In the invention, the elastic graphite has certain pressure resistance, and when the elastic graphite is positioned in a crack, the pressure generated by the continuous opening-closing of the crack can be effectively resisted, so that the blocking slug is not damaged, and the occurrence of repeated leakage is avoided.
Based on the weight parts of the fibers, the composite plugging material for well drilling comprises 13-14 parts by weight of a tough material. In the invention, the tough material is preferably one or more of nitrile rubber, silicon rubber, styrene butadiene rubber and fluororubber, and is further preferably styrene butadiene rubber and silicon rubber; the mass ratio of the styrene-butadiene rubber to the silicone rubber is preferably 10:4 or 9: 4. In the invention, the temperature resistance of the nitrile rubber is 120 ℃, the 24h swelling ratio is less than 5%, the temperature resistance of the silicon rubber is more than 200 ℃, the 24h swelling ratio is less than 5%, the temperature resistance of the styrene butadiene rubber is 150 ℃, the 24h swelling ratio is less than 5%, the temperature resistance of the fluorine rubber is more than 200 ℃, and the 24h swelling ratio is less than 5%.
In the invention, the tough material is added to make other solid materials (solid materials including fiber, inorganic silicon material and elastic material) not easy to break when the solid materials are acted by the ground laminating force; the composite plugging material has certain compressibility and is not easy to generate door sealing phenomenon during plugging.
The preparation method of the composite lost circulation material for drilling is not particularly limited, and the preparation method of the mixture well known to the person skilled in the art can be adopted.
The invention also provides the application of the composite plugging material for drilling in the technical scheme in the drilling plugging, wherein the addition amount of the composite plugging material for drilling is 3-6% of the total weight of the drilling fluid.
In the present invention, the drilling fluid is preferably a water-based drilling fluid or an oil-based drilling fluid.
In the invention, when the composite lost circulation material for well drilling is applied, the composite lost circulation material is preferably used in combination with other lost circulation agents, such as inducer particles and lost circulation slurry; the dosage ratio of the composite plugging material for well drilling to the inducer particles and the plugging slurry is not particularly limited, and the composite plugging material for well drilling can be selected by a person skilled in the art according to the actual situation.
The composite lost circulation material for drilling provided by the invention can be applied to water-based drilling fluid or oil-based drilling fluid, and has no influence on the viscosity of the drilling fluid.
The composite lost circulation material for drilling and the application thereof provided by the present invention will be described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
1 part of carbon fiber with the length of 2mm, 50 parts of inorganic silicon material (10 parts of mica sheet with the particle size of 10-20 meshes, 20 parts of quartz stone with the particle size of 20-40 meshes and 20 parts of wollastonite with the particle size of 20-40 meshes), 35 parts of elastic graphene (with the particle size of 20-60 meshes and the rebound resilience of 85 percent after being compressed under 30 MPa) and 14 parts of toughness material (10 parts of styrene butadiene rubber and 4 parts of silicon rubber) are uniformly stirred at normal temperature and normal pressure to obtain the composite plugging material for drilling.
Applying pressure to the composite plugging material for well drilling for 30MPa-0.5h and original volume of 36cm3Volume after pressurization 26.96cm3Volume 32.15cm after pressure relief3Volume change of 5.19cm3The description shows that the composite plugging material for drilling well obtained in the embodiment is not greatly damaged under high-pressure load, has strong elastic recovery capability, and can effectively deal with the change of opening and closing of cracks.
In the process of well drilling and plugging, a downhole tool is provided, when drilling is carried out, the addition amount of the composite plugging material for well drilling is 6 percent of the total weight of the drilling fluid, the water-based drilling fluid is not thickened obviously, and the demulsification voltage of the oil-based drilling fluid is reduced to 92 percent of the initial value. When the leak stoppage is not completed, the addition amount of the composite leak stoppage material for drilling is 20% of the total weight of the leak stoppage slurry, the water-based drilling fluid is not thickened obviously, and the demulsification voltage of the oil-based drilling fluid is reduced to 90% of the initial value. When the optical drill pipe is used for plugging, the adding amount of the composite plugging material for drilling is 30 percent of the total weight of the plugging slurry, the water-based drilling fluid is not thickened obviously, and the demulsification voltage of the oil-based drilling fluid is reduced to 87 percent of the initial value. The experiment shows that the obtained composite plugging material for drilling has little influence on the viscosity of the drilling fluid, has good elastic recovery capability and is expected to be applied to drilling plugging.
Example 2
2 parts of carbon fiber with the length of 2mm, 60 parts of inorganic silicon material (10 parts of mica sheet with the particle size of 10-20 meshes, 25 parts of quartz stone with the particle size of 20-40 meshes and 25 parts of wollastonite with the particle size of 20-40 meshes), 25 parts of elastic graphite (the particle size of 20-60 meshes and the rebound resilience of 85 percent after being compressed under 30 MPa), 13 parts of toughness material (9 parts of styrene butadiene rubber and 4 parts of silicon rubber) and uniformly stirring at normal temperature and normal pressure to obtain the composite plugging material for drilling.
The original volume of the composite plugging material for well drilling is 36cm under the pressure of 30MPa-0.5h3Volume after pressurization 30.67cm3Volume 33.26cm after pressure relief3Volume change of 2.59cm3The description shows that the composite plugging material for drilling well obtained in the embodiment is not greatly damaged under high-pressure load, has strong elastic recovery capability, and can effectively deal with the change of opening and closing of cracks.
In the process of well drilling and plugging, a downhole tool is provided, when drilling is carried out, the addition amount of the composite plugging material for well drilling is 3 percent of the total mass of the drilling fluid, the water-based drilling fluid is not obviously thickened after the addition, and the demulsification voltage of the oil-based drilling fluid is reduced to 95 percent of the initial value. When the leak stoppage is not completed, the adding amount of the composite leak stoppage material for drilling is 15% of the total weight of the leak stoppage slurry, the water-based drilling fluid is not obviously thickened after being added, and the demulsification voltage of the oil-based drilling fluid is reduced to 92% of the initial value. When the optical drill pipe is used for plugging, the adding amount of the composite plugging material for drilling is 30% of the total weight of the plugging slurry, the water-based drilling fluid is not obviously thickened after being added, and the demulsification voltage of the oil-based drilling fluid is reduced to 89% of the initial value.
Example 3
1 part of carbon fiber with the length of 2mm, 70 parts of inorganic silicon material (15 parts of mica sheet with the particle size of 10-20 meshes, 30 parts of quartz stone with the particle size of 20-40 meshes and 25 parts of wollastonite with the particle size of 20-40 meshes), 15 parts of elastic graphite (with the particle size of 20-60 meshes and the rebound resilience of 85 percent after 30MPa compression), 14 parts of toughness material (10 parts of styrene butadiene rubber and 4 parts of silicon rubber) and uniformly stirring at normal temperature and normal pressure to obtain the composite plugging material for drilling.
The original volume of the composite plugging material for well drilling is 36cm under the pressure of 30MPa-0.5h3Volume after pressurization 32.59cm3Volume after pressure relief 34.17cm3Volume change of 1.58cm3The description shows that the composite plugging material for drilling well obtained in the embodiment is not greatly damaged under high-pressure load, has strong elastic recovery capability, and can effectively deal with the change of opening and closing of cracks.
In the process of well drilling and plugging, a downhole tool is provided, when drilling is carried out, the adding amount of the composite plugging material for well drilling is 3 percent of the total weight of the drilling fluid, the water-based drilling fluid is not obviously thickened after the composite plugging material is added, and the demulsification voltage of the oil-based drilling fluid is reduced to 93 percent of the initial value. When the leak stoppage is not completed, the adding amount of the composite leak stoppage material for drilling is 13 percent of the total weight of the leak stoppage slurry, the water-based drilling fluid is not obviously thickened after being added, and the demulsification voltage of the oil-based drilling fluid is reduced to 90 percent of the initial value. When the optical drill pipe is used for plugging, the adding amount of the composite plugging material for drilling is 25 percent of the total weight of the plugging slurry, the water-based drilling fluid is not obviously thickened after being added, and the demulsification voltage of the oil-based drilling fluid is reduced to 89 percent of the initial value.
Comparative example 1
1 part of fiber material (carbon fiber), 30 parts of walnut shell, 30 parts of shell powder, 15 parts of calcium carbonate and 14 parts of natural rubber, and uniformly stirring at normal temperature and normal pressure to obtain the plugging material.
Applying pressure to the plugging material for 30MPa-0.5h, wherein the original volume is 36cm3Volume after pressurization 33.16cm3Volume after pressure relief 33.59cm3The volume recovery is extremely small, and most of walnut shells are obviously broken.
In the process of drilling and plugging, the addition amount of the plugging material is 2-15% of the total weight of the drilling fluid. When the addition amount is 2%, the water-based drilling fluid is thickened slightly, and the demulsification voltage of the oil-based drilling fluid is reduced to 60% of the initial value; when the addition amount is 8%, the water-based drilling fluid is thickened greatly, and the demulsification voltage of the oil-based drilling fluid is reduced to 40% of the initial value; when the addition amount is 15%, the water-based drilling fluid is thickened greatly, and the demulsification voltage of the oil-based drilling fluid is reduced to 40% of the initial value; obviously, compared with the composite lost circulation material for drilling provided by the embodiment of the invention, the lost circulation material obtained by the comparative example has almost no elastic recovery capability and has larger influence on the performance of the drilling fluid.
Comparative example 2
Similar to the starting material of example 1, except that the amount of the elastic graphite was 10 parts.
Comparative example 3
Similar to the starting material of example 1, except that the amount of the elastic graphite was 40 parts.
Comparative example 4
Similar to example 2, except that the carbon fiber was used in an amount of 3 parts.
Comparative example 5
Similar to example 2, except that the tough material was used in an amount of 15 parts.
Comparative example 6
Similar to example 3, except that the inorganic silicon material was used in an amount of 45 parts.
Comparative example 7
Similar to example 3, except that the inorganic silicon material was used in an amount of 80 parts.
Indoor anti-regurgitation capacity test:
filling gravels with the particle size of 4-10 mm in a sand filling cylinder of the device shown in figure 1; meanwhile, the annular pressure of 10MPa is applied to the sand filling cylinder.
4000mL of leakage stoppage slurry (the leakage stoppage slurry comprises 4000mL of fresh water, 200g of water-based suspending agent (sold by Jiahua science and technology Limited, Jingzhou, Blockvis-W), 1200g of composite leakage stoppage material and 4000g of barite) is added into a slurry cylinder at the upper part of the leakage stoppage instrument, pressurization is started from the upper part of the equipment, the highest pressurization is 7MPa, and the pressure of 1MPa is increased after the leakage is kept or no leakage is lost for 30min under each pressure state;
thirdly, when the pressure reaches 7MPa, maintaining for 30min, removing the pressure, removing the residual plugging slurry, and filling the testing base slurry (the base slurry comprises 100 parts of fresh water, 0.8 part of xanthan gum and 100 parts of barite) in the slurry cylinder, wherein the dosage is based on filling the slurry cylinder; the composite plugging material is obtained in examples 1-3 and comparative examples 1-7;
starting a reverse discharge experiment, connecting an upper joint with a pressure gauge, and starting pressurization from the lower part;
fifthly, on the lower part of the plugging instrument, gradually pressurizing every 1MPa according to experimental requirements, carrying out reverse-flow test, stabilizing the pressure for 30min after each pressurization, observing data of a pressure gauge on the upper part, if no data is displayed, no reverse flow occurs on the plugging part, if pressure is displayed, reverse flow occurs, and recording pressure data on the upper part, namely, the reverse flow pressure;
after the test is finished, the experimental device is disassembled, the staying position of the plugging material in the sand bed in the sand filling cylinder is observed, and the invasion depth is recorded.
The results of the indoor anti-backflow performance tests of examples 1 to 3 and comparative examples 1 to 7 obtained by the above tests are shown in fig. 1.
Table 1 results of testing indoor anti-backflow capability of composite plugging materials obtained in examples 1 to 3 and comparative examples 1 to 7
As can be seen from table 1: compared with the plugging material in the prior art (namely the plugging material provided in the comparative example 1), the composite plugging material for drilling provided by the invention has generally higher re-spitting pressure and stronger capability of invading leaks, and the larger the addition of the elastic graphite is, the stronger the anti-re-spitting pressure and the capability of invading leaks are; when the amount of the inorganic silicon material is too large, the penetration depth is affected, and the anti-regurgitation ability is affected.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The composite lost circulation material for well drilling is characterized by comprising the following components in parts by weight: 1-2 parts of fiber, 50-70 parts of inorganic silicon material, 15-35 parts of elastic material and 13-14 parts of tough material; the elastic material is elastic graphite.
2. The composite lost circulation material for drilling well according to claim 1, wherein the length of the fiber is less than or equal to 2 mm.
3. The composite lost circulation material for well drilling as claimed in claim 1 or 2, wherein the fiber is one or more of carbon fiber, polyester fiber, aluminum silicate fiber and glass fiber.
4. The composite lost circulation material for drilling as claimed in claim 1, wherein the inorganic silicon material has a particle size of 10-40 mesh.
5. The composite lost circulation material for well drilling as claimed in claim 1 or 4, wherein the inorganic silicon material is one or more of marble, quartz sand, mica sheet and wollastonite.
6. The composite lost circulation material for drilling as claimed in claim 1, wherein the particle size of the elastic graphite is 20-60 meshes.
7. The composite lost circulation material for drilling as claimed in claim 1 or 6, wherein the compression resistance of the elastic graphite is that the resilience rate is more than or equal to 85% after 30MPa compression.
8. The composite lost circulation material for drilling well as claimed in claim 1, wherein the tough material is one or more of nitrile rubber, silicone rubber, styrene butadiene rubber and fluororubber.
9. The application of the composite lost circulation material for drilling well in the well drilling and leaking stoppage, which is characterized in that the addition amount of the composite lost circulation material for drilling well is 3-6% of the total weight of the drilling fluid.
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| CN111849431B (en) | 2022-10-28 |
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