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CN110699055B - Plugging composition suitable for medium-small leakage plugging - Google Patents

Plugging composition suitable for medium-small leakage plugging Download PDF

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CN110699055B
CN110699055B CN201911031309.6A CN201911031309A CN110699055B CN 110699055 B CN110699055 B CN 110699055B CN 201911031309 A CN201911031309 A CN 201911031309A CN 110699055 B CN110699055 B CN 110699055B
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CN110699055A (en
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祝琦
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China National Petroleum Corp
CNPC Bohai Drilling Engineering Co Ltd
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China National Petroleum Corp
CNPC Bohai Drilling Engineering Co Ltd
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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
    • C09K8/42—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
    • 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
    • C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/08—Fiber-containing well treatment fluids
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
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Abstract

The invention discloses a plugging material composition, which comprises a component A: water-absorbing expansion plugging polymer particles with the molecular weight of 1600-2400 ten thousand, and the component B is: at least one of coke particles and hazelnut shell fragments, component C: glass fibers and/or asbestos fibers, component D: the mixture of sawdust, bagasse, reed straw scraps and rice hull scraps, or the mixture of sawdust, bagasse, reed straw scraps, calamus scraps and rice hull scraps; the plugging material composition is prepared by adopting four components with different particle size ranges according to a certain proportion, and after well drilling fluid is pumped into a leakage layer, water-absorbing expansion polymer particles expand per se and support and fill pores or cracks of the leakage layer along with other plugging materials, so that the purpose of adapting the sizes of the pores or cracks of a medium-small leakage layer is realized, and a stable plugging layer section is finally formed.

Description

Plugging composition suitable for medium-small leakage plugging
Technical Field
The invention relates to the technical field of well drilling plugging processes, in particular to a plugging composition suitable for medium-small leakage plugging.
Background
With the deep exploration and development of oil and gas, when the drilled stratum is in a fractured zone, a fault, a fracture development stratum, a high-permeability sandstone stratum or a conglomerate stratum, and in the drilling construction of old oil areas, wells with complex structures and deep wells, the stratum original pressure system is damaged under the influence of factors such as stratum geological factors, ground stress factors, long-term injection and production factors and the like, and the problem of well leakage is very prominent when the stratum pressure is exhausted.
The formation in which lost circulation accidents occur due to the above factors has become the primary area in which lost circulation in drilling wells occurs. When the drill meets the area, the leakage loss exists or occurs in different forms and different degrees, and comprises the leakage loss of the bottom strata of the sandstone Libang pottery group, the leakage loss of the strata deficit of the Dongyang pottery group and the sandstone river street group, the leakage loss of the basalt Libang pottery group, the leakage loss of the fractured strata of the sandstone Liujia ditch group and the double stone group, the leakage loss of the oil-gas reservoir of the conglomerate stratum and the like.
When the drilled layer section meets the cementation loose stratum, the high permeability stratum, the conglomerate stratum and other layer sections, the stratum is easy to leak due to factors such as the loose cementation of the stratum, high permeability, large pore throat width, mud liquid column pressure larger than the stratum pressure and the like.
At present, in regions such as an oil area in a drilled wing, a Suliger area, a Bayan river jacket oil area and the like, the matching recognition of factors such as the particle size, the rigidity strength and the like of a stratum and a plugging material in the oil area is not in place; in addition, the plugging materials entering the well are various, the functions of the rigidity, toughness, material size and the like of the materials in the formation bridging and cooperative plugging are unknown, so that the plugging measures fail, repeated plugging is realized, the slurry preparation construction cost is increased, the plugging process and scheme are incomplete, and the plugging effect is poor.
In-situ measurement of drilling fluid loss to leakage velocity (m)3The term,/h). According to the record of drilling fluid technology, the diameter is less than 10m3The volume is divided into micro-leaks of 10-20 m3The/h is divided into small leaks of 20 to 50m3H is divided into medium drain, greater than 50m3The/h is divided into large drains. However, because the underground geological structure is complex and the structure mode is unknown, the leakage degree is measured by the leakage speed, the field construction condition is met, the field operation personnel can conveniently judge the leakage degree, and reference is provided for the follow-up leakage stopping operation process, the concentration of the prepared leakage stopping slurry and the volume of the leakage stopping slurry.
In the stratum with high porosity, high permeability, stratum vacancy, long-term injection and production reservoir, brittle stratum and the like, the rigid plugging agent/material is influenced by the geometrical size, the geometrical shape, the rigidity strength and the like of the rigid plugging agent/material, and the matching degree of the rigid plugging agent/material to the different sizes of the porosity and the different fracture widths is different; in addition, the brittleness, the flexibility, the material and the like of the rigid plugging material have great difference, and after the rigid plugging material is extruded into the stratum and is extruded into the stratum, some rigid plugging agent/material is extruded and crushed, and some rigid plugging agent/material is still remained outside pores and cracks, so that the subsequent plugging material is prevented from entering. And the crushed plugging agent/material can only plug pores or cracks with smaller volume than the material. When the plugging slurry is extruded outwards under the pressure of the stratum and is drained back into a shaft along with the plugging slurry, the plugging effect is difficult to achieve, the vicious consequence of 'plugging while discharging' is caused, the original porosity and the size of a crack are easy to increase, and the plugging difficulty is increased; when the leaking stoppage material blocked at the periphery is squeezed again, the pumping pressure is increased, fuel oil is consumed, and the loss of machine equipment is increased; when the squeeze pressure reaches the formation fracture pressure, the formation is fractured, resulting in greater formation loss.
Disclosure of Invention
The object of the present invention is to overcome the above-mentioned drawbacks and deficiencies of the prior art by providing a plugging composition suitable for medium-small leak plugging.
Therefore, the technical scheme of the invention is as follows:
consists of a component A, a component B, a component C and a component D, wherein,
the component A is water-absorbing expansion plugging polymer particles, and is a copolymer which is formed by copolymerizing a first monomer, a second monomer, a third monomer and a fourth monomer and has the number average molecular weight of 1600-2400 ten thousand; the first monomer is acrylamide, the second monomer is at least one of methyl acrylate and butyl acrylate, the third monomer is at least one of potassium acrylate, sodium acrylate and acrylic acid, and the fourth monomer is a double-bond-containing I-type monomer and/or II-type monomer; wherein,
the chemical structural formula of the type I monomer is as follows:
Figure BDA0002250234340000031
wherein R is1Is CH3、C2H5、C3H7、
Figure BDA0002250234340000032
The chemical structural formula of the type II monomer is as follows:
Figure BDA0002250234340000033
wherein R is2Is CH3、C2H5、C3H7、
Figure BDA0002250234340000034
Figure BDA0002250234340000035
R3Is CH3、C2H5、C3H7、
Figure BDA0002250234340000036
The particle size of the water-absorbing swelling plugging polymer particles is 20-40 meshes;
the component B is at least one of coke particles and hazelnut shell fragments; wherein the particle size of the coke particles is 20-40 meshes; the particle size of the hazelnut shell fragments is 10-20 meshes;
the component C is glass fiber and/or asbestos fiber; wherein the diameter of a single fiber of the glass fiber is 30-50 nm; the diameter of a single fiber of the asbestos fiber is 20-50 nm;
the component D adopts a mixture of sawdust, bagasse, reed straw scraps and rice hull scraps, or a mixture of sawdust, bagasse, reed straw scraps, calamus scraps and rice hull scraps; wherein the sawdust is formed by mixing 10-20 parts by weight of sawdust with a particle size of 20-40 meshes, 10-20 parts by weight of sawdust with a particle size of 60-80 meshes and 10-20 parts by weight of sawdust with a particle size of 100-120 meshes; the grain size of the bagasse is 20-40 meshes; the particle size of the reed straw scraps is 5-20 meshes; the particle size of the calamus chippings is 5-10 meshes; the grain size of the rice hull scraps is 20-40 meshes;
the plugging composition is prepared by mixing 20-40 parts of component A, 10-20 parts of component B, 10-40 parts of component C and 40-75 parts of component D in parts by weight, and is used for plugging the leakage rate of 10-20 m3A formation under a small leak-off condition of/h; the plugging composition is prepared by mixing 30-40 parts by weight of component A, 15-20 parts by weight of component B, 15-40 parts by weight of component C and 50-75 parts by weight of component D, and is used for plugging the leakage rate of 20-50 m3The formation in a medium leak-off condition of/h.
In the components of the plugging material composition suitable for medium-small stratum leakage plugging, the water-absorbing expansion polymer particles are flexible materials, and the water-absorbing expansion polymer particles have the functions of reducing the pressure per unit area and balancing the peripheral pressure of the flexible materials, can absorb a part of extrusion pressure, and cannot cause the problems of stratum fracturing and formation of larger-size cracks due to the fact that the extrusion pressure is too large and exceeds the fracture pressure of the stratum. The rigid materials such as coke particles, hazelnut shell fragments and the like have certain compressive strength due to weak compressibility and can be filled and retained in lost formation pores or cracks to support the formation pores or cracks; the glass fiber and the asbestos fiber form a cross-linked net structure, so that other plugging materials can be prevented from flowing towards the direction of a shaft, and the plugging and pressure-bearing capacity can be improved. The reed straw scraps, calamus scraps, rice hull scraps, bagasse and sawdust can be used for filling pores or cracks of a stratum, and can also be matched with other plugging materials for filling gaps among bridging structures. In conclusion, the plugging material composition realizes the effect of effectively resisting internal and external pressure by utilizing the plugging section formed by mutually bridging the component A, the component B, the component C and the component D, can bear certain pressure and further realizes the purpose of effectively plugging a lost stratum.
Preferably, the sawdust is prepared by mixing dry alkalized pine sawdust obtained by soaking in 10-20 wt.% of sodium hydroxide or potassium hydroxide solution for 48h and airing for 72h, and dry alkalized poplar sawdust obtained by soaking in 10-20 wt.% of sodium hydroxide or potassium hydroxide solution for 48h and airing for 72h, wherein the weight ratio of the two is 1: 1.
Preferably, the reed straw scraps are prepared by crushing dry alkalized reed straws which are obtained by soaking in 10-20 wt.% of sodium hydroxide or potassium hydroxide solution for 72 hours and airing for 3-6 months.
Preferably, the calamus chips are prepared by crushing dry alkalized calamus obtained by soaking 10-20 wt.% of sodium hydroxide or potassium hydroxide solution for 72 hours and airing for 3-6 months.
Preferably, the length of a single fiber of the glass fiber is 10-15 mm.
Preferably, the length of a single fiber of the asbestos fiber is 10-15 mm.
Preferably, the weight ratio of the first monomer to the second monomer to the third monomer to the fourth monomer is 10-40: 10-20: 10-15.
Compared with the prior art, the plugging material composition is prepared by adopting the component A, the component B, the component C and the component D with different particle size ranges according to a certain proportion, after well drilling fluid is pumped into a leakage layer, water-absorbing expansion polymer particles expand per se and support and fill pores or cracks of the leakage layer along with other plugging materials, so that the purpose of adapting the sizes of the pores or cracks of medium-small leakage layers is realized, and a stable plugging layer section is finally formed.
Drawings
FIG. 1 is a schematic diagram of the well location distribution structure of the L1 same sub-well for plugging experiments in examples 1-6 and comparative example 1;
FIG. 2 is a schematic diagram of the well location distribution structure of the H5 same sub-well for plugging experiments in examples 7-9.
Detailed Description
The present invention will be further described with reference to the following examples, which are not intended to limit the invention in any way.
In the following embodiments, the particle size of the water-absorbing swelling plugging polymer particles is 20-40 meshes, the particle size of the coke particles is 20-40 meshes, the particle size of the hazelnut shell fragments is 10-20 meshes, the diameter of a single fiber of the glass fiber is 30-50 nm, the diameter of a single fiber of the asbestos fiber is 20-50 nm, the sawdust is formed by mixing 10 parts by weight of sawdust with the particle size of 20-40 meshes, 20 parts by weight of sawdust with the particle size of 60-80 meshes and 10 parts by weight of sawdust with the particle size of 100-120 meshes, the particle size of the bagasse is 20-40 meshes, the particle size of the reed straw fragments is 5-20 meshes, the particle size of the calamus fragments is 5-10 meshes, and the particle size of the rice hull fragments is 20-40 meshes.
As shown in FIG. 1, L1 is the same as a single sub-well, and specifically consists of seven straight wells in total, including L1-1, L1-2, L1-3, L1-4, L1-5, L1-6 and L1-7. Wherein, L1 is the same as the platform sub-well, and the well drilling depth is 3595 and 4157 meters. The stratum to be drilled is sandstone, and the geological layers of the sandstone are a fourth-series plain group, an upper third-series Minghua group, a Liangpottery group, a lower third-series Dongying group and a Sanchi street group respectively. And referring to the history of the drilled temporary well and geological data, the sand river street group of the platform well is a main loss interval, and the well depth of the loss interval is 3496-3875 meters.
The well spacing of the seven vertical wells is 10 m. The L1 has the same completion interval, the same well type, the same drilling block and the same lost circulation interval as the platform sub well. The differences are geological lithology of the leakage layer, cementing degree of the stratum, ground stress distribution and size, geothermal gradient (a well section with abnormal temperature exists), leakage pore or crack structure, opening degree, size, width, length and the like of pores or cracks of the leakage layer section. The occurrence of lost circulation is determined primarily by the geological structure of the formation being drilled, the nature of the formation rock, the earth stresses, and other factors. The well leakage of the sandstone stratum is determined by factors such as the cementation degree of sandstone fragments, the drillability of rocks, the hardness of the rocks, the ground stress of the rocks, the mineral composition of the rocks, the pore development degree of the rocks, the development degree of cracks and the like. Therefore, the same sub-well as L1 was selected as the test well group for the plugging material composition for medium-small formation lost circulation plugging to perform the in-situ plugging application. In addition, when the seven vertical wells are constructed on site, the condition of the lost stratum on site is complex and difficult to judge; therefore, when the plugging construction is carried out, the proportion and the addition of the plugging material composition are determined by measuring and calculating the leakage rate, and the on-site plugging test is completed.
Example 1
During construction, the L1-1 well began to show signs of loss after drilling to a well depth of 3502 meters. Specifically, the loss is 25.75m in total as shown by a mud slurry tank scale at the well section of 3502-3521m (the well temperature is 105-106 ℃), and3and the leakage velocity is measured and calculated to be 12.58m3And/h is lost. At the moment, the pumping discharge capacity of the drilling fluid is reduced to 25L/s, the viscosity of a funnel of the drilling fluid is 40s, the plastic viscosity is 19mPa & s, and the drilling well is drilledThe liquid density was 1.21g/cm3。
Based on the above problem, 50m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 20 parts by weight of water-swellable polymer particles, 10 parts by weight of sawdust, 10 parts by weight of bagasse, 10 parts by weight of reed straw chips, 10 parts by weight of asbestos fibers, 10 parts by weight of hazelnut shell chips and 10 parts by weight of rice hull chips; wherein, the water-swelling polymer particles are a copolymer (with the number-average molecular weight of 1600 ten thousand) prepared by copolymerization of 30 parts by weight of acrylamide, 10 parts by weight of methyl acrylate, 10 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 3:5) and 10 parts by weight of I-type monomer; the structural formula of the I type monomer is as follows:
Figure BDA0002250234340000061
R1is composed of
Figure BDA0002250234340000071
And the pumping capacity of the drilling fluid is reduced to 23L/s, and the drilling is continued to 3512 m. At the moment, the scale of the slurry tank is lifted, and the numerical value after lifting shows that the scale is lifted by 1.3m before loss3(ii) a The discharge capacity is increased to 25L/s, the drilling is continued to 3520m, and the scale of the slurry tank is not changed; continuously increasing the discharge capacity to 33L/s, continuously drilling to 3535m, and keeping the scale of the slurry tank unchanged; the displacement is kept until the drilling is finished, which indicates that the plugging operation is successful.
Comparative example 1
L1-2 well, drilled 3500 meters deep, started to show signs of loss. The method is characterized in that the loss is 24.25m in total as shown by a mud liquid tank scale at a well section of 3500-3518m (the well temperature is 105-106 ℃), and3and the leakage speed is measured and calculated to be 13.20m3And/h is lost. At the moment, the pumping discharge capacity of the drilling fluid is reduced to 24L/s, the viscosity of a drilling fluid funnel is 40s, the plastic viscosity is 18mPa & s, and the density of the drilling fluid is 1.22g/cm3。
Based on the above problem, 50m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 20 parts by weight of water-swellable polymer particles, 10 parts by weight of sawdust, 10 parts by weight of bagasse, 10 parts by weight of reed straw chips, 10 parts by weight of coke particles, 10 parts by weight of hazelnut shell chips, 10 parts by weight of calamus chips and 10 parts by weight of rice hull chips; wherein, the water-swelling polymer particles are a copolymer (with the number-average molecular weight of 1600 ten thousand) prepared by copolymerization of 30 parts by weight of acrylamide, 10 parts by weight of methyl acrylate, 10 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 3:5) and 10 parts by weight of I-type monomer; the structural formula of the I type monomer is as follows:
Figure BDA0002250234340000072
R1is composed of
Figure BDA0002250234340000073
And the pumping capacity of the drilling fluid is reduced to 22L/s, and the drilling is continued to 3511 m. At this point, the mud pot scale is lifted. The value after lifting shows that the lifting is 0.8m higher than that before loss3. The discharge capacity is increased to 25L/s, the drilling is continued to 3526m, the scale of the slurry tank is changed, the scale of the slurry tank is reduced to some extent, and the scale is reduced by 0.5m3(ii) a The leakage stopping operation is continuously carried out by adopting the leakage stopping material combination with the proportion, the discharge capacity is reduced to 23L/s, the drilling is continuously carried out to 3530m, and the scale of the slurry tank is reduced by 2m3Indicating that the plugging operation while drilling fails; it can be seen that the network structure is an essential component in the plugging composition, leading to failure of plugging.
Example 2
And an L1-3 well is drilled to a well depth of 3665 meters, and then the leakage signs begin to appear. Specifically, the loss is 52.78m when the mud liquid tank is displayed on a scale at a well section of 3665-3688m (the well temperature is 110-113 ℃), and3and the leakage velocity is measured and calculated to be 23.42m3And/h is lost. At this timeThe pumping capacity of the drilling fluid is reduced to 25L/s, the viscosity of a drilling fluid funnel is 39s, the plastic viscosity is 16mPa & s, and the density of the drilling fluid is 1.23g/cm3。
Based on the above problem, 70m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 30 parts by weight of water-swellable polymer particles, 15 parts by weight of sawdust, 15 parts by weight of bagasse, 5 parts by weight of coke particles, 10 parts by weight of reed straw chips, 15 parts by weight of asbestos fibers, 10 parts by weight of hazelnut shell chips and 10 parts by weight of rice hull chips; wherein, the water-swelling polymer particles are a copolymer (with the number-average molecular weight of 1800 ten thousand) prepared by copolymerization of 10 parts by weight of acrylamide, 10 parts by weight of methyl acrylate, 10 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 3:5) and 10 parts by weight of II type monomers; the structural formula of the II type monomer is as follows:
Figure BDA0002250234340000081
R2is C3H7，R3Is composed of
Figure BDA0002250234340000082
And reducing the pumping capacity of the drilling fluid to 23L/s, and continuing to drill to 3669 m. At this point, the mud pot scale is lifted. The values after lifting showed a 1.6m rise over the values before loss3. The displacement of 23L/s is kept, the drilling is continued to 3675m, and the numerical value of the scale is reduced by 0.2m3And reducing the discharge capacity to 22L/s, continuing to perform plugging operation by using the plugging slurry, and continuing to drill to 3683m, wherein the scale of the slurry tank is not changed. And continuously increasing the discharge capacity to 25L/s, drilling to 3689m, wherein the scale of the slurry tank is not changed, and continuously drilling to 3700m, wherein the scale of the slurry tank is not changed. The displacement is kept until drilling is finished, which shows that the plugging operation while drilling is successful.
Example 3
L1-4 well drilled intoAfter 3668 meters deep, evidence of leakage begins to appear. The method is characterized in that the loss is 53.88m in total as shown by a mud liquid tank scale at a well section of 3668-3718m (the well temperature is 110-112 ℃), and3and the leakage velocity is measured and calculated to be 23.62m3And/h is lost. At the moment, the pumping discharge capacity of the drilling fluid is reduced to 25L/s, the viscosity of a drilling fluid funnel is 39s, the plastic viscosity is 16mPa & s, and the density of the drilling fluid is 1.23g/cm3。
Based on the above problem, 70m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 30 parts by weight of water-swellable polymer particles, 15 parts by weight of sawdust, 15 parts by weight of bagasse, 10 parts by weight of reed straw chips, 15 parts by weight of asbestos fibers, 10 parts by weight of hazelnut shell chips and 10 parts by weight of rice hull chips; wherein, the water-swelling polymer particles are a copolymer (with the number-average molecular weight of 1800 ten thousand) prepared by copolymerization of 10 parts by weight of acrylamide, 10 parts by weight of methyl acrylate, 10 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 3:2) and 10 parts by weight of II type monomers; the structural formula of the II type monomer is as follows:
Figure BDA0002250234340000091
R2is C2H5，R3Is composed of
Figure BDA0002250234340000092
The pumping capacity of the drilling fluid is reduced to 23L/s, the drilling is continued to 3672m, at the moment, the scale of the mud liquid tank is lifted, the numerical value after the lifting is displayed, and the scale is lifted by 2.3m before the loss3(ii) a The discharge capacity of 23L/s is kept, the drilling is continued to 3685m, the plugging slurry is continuously used for plugging, the drilling is continued to 3695m, the scale of the slurry tank is lowered to some extent, and the 1.0m reduction is realized3(ii) a The discharge capacity is reduced to 21L/s, the drilling is carried out to 3710m, the scale of the mud liquid tank is not changed, the drilling is continued to 3715m, the scale of the mud liquid tank is not changed, the drilling is continued to 3725m,the mud liquid tank scale is not changed; the displacement is kept until drilling is finished, which shows that the plugging operation while drilling is successful.
Example 4
L1-5 well, after drilling to well depth 3522 meters, began to show signs of loss. Specifically, the loss is 22.58m in total as shown by a ruler of a mud liquid tank at a well section of 3522-3538m (the well temperature is 106-107 ℃), and3and the leakage speed is measured and calculated to be 13.60m3And/h is lost. At the moment, the pumping capacity of the drilling fluid is reduced to 24L/s, the viscosity of a drilling fluid funnel is 39s, the plastic viscosity is 18mPa & s, and the density of the drilling fluid is 1.21g/cm3。
Based on the above problem, 50m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 20 parts by weight of water-swellable polymer particles, 10 parts by weight of sawdust, 10 parts by weight of bagasse, 10 parts by weight of reed straw chips, 10 parts by weight of asbestos fibers, 10 parts by weight of hazelnut shell chips and 10 parts by weight of rice hull chips; wherein, the water-swelling polymer particles are a copolymer (with the number-average molecular weight of 1600 ten thousand) prepared by copolymerization of 30 parts by weight of acrylamide, 10 parts by weight of methyl acrylate, 10 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 3:5) and 10 parts by weight of I-type monomer; the structural formula of the I type monomer is as follows:
Figure BDA0002250234340000101
R1is composed of
Figure BDA0002250234340000102
And the pumping capacity of the drilling fluid is reduced to 22L/s, and the drilling is continued to 3528 m. At this point, the mud pot scale is lifted. The value after lifting showed a 2.8m rise over that before loss3. Keeping the discharge capacity of 22L/s, continuously drilling to 3532m, keeping the scale of the mud tank unchanged, increasing the discharge capacity to 25L/s, continuously drilling to 3539m, keeping the scale of the mud tank unchanged, and keeping the discharge capacityAnd drilling is continued to 3545m, and the scale of the slurry tank is not changed, which indicates that the plugging is successful.
When the well is drilled to a depth of 3765 meters, the leakage begins to appear again. The specific expression is that at the well section of 3765-3788m (the well temperature is 113-114 ℃), the mud liquid tank scale shows that the total loss is 56.25m3And the leakage velocity is measured and calculated to be 24.95m3And/h is lost. At the moment, the pumping discharge capacity of the drilling fluid is reduced to 23L/s, the viscosity of a funnel of the drilling fluid is 40s, the plastic viscosity is 17mPa & s, and the density of the drilling fluid is 1.22g/cm3。
Based on the above problem, 80m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 30 parts by weight of water-swellable polymer particles, 15 parts by weight of sawdust, 15 parts by weight of bagasse, 10 parts by weight of reed straw chips, 15 parts by weight of glass fibers, 15 parts by weight of asbestos fibers, 15 parts by weight of hazelnut shell chips and 10 parts by weight of rice hull chips; wherein the water-swellable polymer particles are a copolymer (the number-average molecular weight is 2000 ten thousand) prepared by copolymerization of 30 parts by weight of acrylamide, 15 parts by weight of methyl acrylate, 20 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 1:1) and 10 parts by weight of II type monomers; the structural formula of the II type monomer is as follows:
Figure BDA0002250234340000111
R2is C2H5，R3Is composed of
Figure BDA0002250234340000112
And the pumping capacity of the drilling fluid is reduced to 21L/s, and the drilling is continued to 3769 m. At this point, the mud pot scale is lifted. The values after lifting showed a 3.1m rise over the values before loss3. Increasing to 23L/s, drilling to 3773m, drilling to 3780m, and allowing the slurry tank to have scale belowDecrease by 1.2m3. And reducing the discharge volume to 21L/s, drilling to 3785m, continuously drilling to 3790m, continuously drilling to 3805m when the mud liquid tank scale is not changed yet, and not changing. The displacement is kept until drilling is finished, which shows that the plugging operation while drilling is successful.
Example 5
L1-6 well, drilling to 3222 m depth, began to show signs of loss. The specific expression is that the mud liquid tank scale shows that the loss is 16.88m in total at the well section of 3222-3238m (the well temperature is 97-98 ℃), and3and the leakage speed is measured and calculated to be 5.60m3And/h is lost. At the moment, the pumping capacity of the drilling fluid is reduced to 24L/s, the viscosity of a funnel of the drilling fluid is 39s, the plastic viscosity is 17mPa & s, and the density of the drilling fluid is 1.21g/cm3。
Based on the above problem, 30m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 20 parts by weight of water-swellable polymer particles, 10 parts by weight of sawdust, 10 parts by weight of bagasse, 10 parts by weight of reed straw chips, 10 parts by weight of asbestos fibers, 10 parts by weight of hazelnut shell chips and 10 parts by weight of rice hull chips; wherein, the water-swelling polymer particles are a copolymer (with the number-average molecular weight of 1600 ten thousand) prepared by copolymerization of 30 parts by weight of acrylamide, 10 parts by weight of methyl acrylate, 10 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 3:5) and 10 parts by weight of I-type monomer; the structural formula of the I type monomer is as follows:
Figure BDA0002250234340000121
R1is composed of
Figure BDA0002250234340000122
The drilling fluid pumping capacity is reduced to 22L/s, and drilling is continued to 3228 m. At this point, the mud pot scale is lifted. The value after lifting shows that the value is higher than that before loss1.5m3. And (4) keeping the discharge capacity of 22L/s, continuously drilling to 3236m, keeping the scale of the mud tank unchanged, increasing the discharge capacity to 25L/s, continuously drilling to 3242m, keeping the scale of the mud tank unchanged, keeping the discharge capacity to continuously drill to 3250m, and keeping the scale of the mud tank unchanged, thereby indicating that the plugging is successful.
When the well was drilled to a depth of 3825 meters, the signs of loss began to appear again. The method is characterized in that the loss is 76.85m in total as shown by a ruler of a mud liquid tank at the well section of 3825-3850m (the well temperature is 115-117℃)3And calculating to obtain the leakage velocity of 36.95m3And/h is lost. At the moment, the pumping discharge capacity of the drilling fluid is reduced to 23L/s, the viscosity of a funnel of the drilling fluid is 41s, the plastic viscosity is 19mPa & s, and the density of the drilling fluid is 1.22g/cm3。
Based on the above problem, 80m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 30 parts by weight of water-swellable polymer particles, 20 parts by weight of sawdust, 10 parts by weight of bagasse, 10 parts by weight of reed straw chips, 20 parts by weight of asbestos fibers, 20 parts by weight of hazelnut shell chips and 10 parts by weight of rice hull chips; wherein the water-swellable polymer particles are a copolymer (with the number-average molecular weight of 2200 ten thousand) prepared by copolymerization of 40 parts by weight of acrylamide, 20 parts by weight of a mixture of methyl acrylate and butyl acrylate (the molar ratio of the two is 1:2), 10 parts by weight of a mixture of potassium acrylate, sodium acrylate and acrylic acid (the molar ratio of the three is 1:3:2) and 15 parts by weight of a type II monomer; the structural formula of the II type monomer is as follows:
Figure BDA0002250234340000131
R2is C3H7，R3Is composed of
Figure BDA0002250234340000132
The pumping capacity of the drilling fluid is reduced to 21L/s, and drilling is continued to 3832 m. At this point, the mud pot scale is lifted. Lifting upThe latter values show a 2.2m rise over the values before loss3. Increasing to 22L/s, drilling to 3837m, continuing to use the plugging slurry to perform plugging operation, and drilling to 3840m, lowering the scale of the slurry tank to 0.6m3. And reducing the discharge capacity to 20L/s, drilling to 3845m, keeping the scale of the slurry tank unchanged, continuing to drill to 3852m, keeping the scale of the slurry tank unchanged, and continuing to drill to 3858m, wherein the scale of the slurry tank is unchanged. The displacement is kept until drilling is finished, which shows that the plugging operation while drilling is successful.
Example 6
The L1-7 well, when drilled to a well depth of 3855 meters, began to show signs of loss. The method is characterized in that the loss is 86.85m in total as shown by a ruler of a mud liquid tank at the well section of 3855-3885m (the well temperature is 116-120 ℃), and3and the leakage velocity is measured and calculated to be 45.85m3And/h is lost. At the moment, the pumping discharge capacity of the drilling fluid is reduced to 23L/s, the viscosity of a funnel of the drilling fluid is 41s, the plastic viscosity is 20mPa & s, and the density of the drilling fluid is 1.23g/cm3。
Based on the above problem, 100m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 40 parts by weight of water-swellable polymer particles, 20 parts by weight of sawdust, 15 parts by weight of bagasse, 20 parts by weight of reed straw chips, 20 parts by weight of glass fibers, 20 parts by weight of asbestos fibers, 20 parts by weight of hazelnut shell chips and 10 parts by weight of rice hull chips; wherein the water-swellable polymer particles are a copolymer (with the number-average molecular weight of 2400 ten thousand) prepared by copolymerization of 40 parts by weight of acrylamide, 20 parts by weight of a mixture of methyl acrylate and butyl acrylate (the molar ratio of the two is 3:2), 20 parts by weight of a mixture of potassium acrylate, sodium acrylate and acrylic acid (the molar ratio of the three is 2:3:3) and 10 parts by weight of a II-type monomer; the structural formula of the II type monomer is as follows:
Figure BDA0002250234340000133
R2is C3H7，R3Is composed of
Figure BDA0002250234340000141
Drilling fluid pumping capacity is reduced to 21L/s, and drilling is continued to 3859 m. At this point, the mud pot scale is lifted. The values after lifting showed a 0.4m rise over the values before loss3. Increasing to 22L/s, drilling to 3862m, continuing to use the plugging slurry to perform plugging operation, drilling to 3866m, lowering the scale of the slurry tank to 0.2m3. And (3) continuously drilling to 3870m according to the discharge capacity of 21L/s, continuously drilling to 3880m, and increasing the discharge capacity to 23L/s, continuously drilling to 3890m, wherein the scale of the mud liquid tank is not changed. The displacement is kept until drilling is finished, which shows that the plugging operation while drilling is successful.
Further, H5 same sub-well consisting of H5-1, H5-2, H5-3 and three directional wells is used for plugging construction, wherein the H5-1 well inclination angle is about 45 degrees, the H5-2 well inclination angle is approximately 90 degrees, and the H5-3 well inclination angle is less than 45 degrees.
H5 is the same as a bench well, finishes drilling 2320 and 2725 meters. The stratum to be drilled is sandstone, and the geological layers of the sandstone are a fourth series plain group, an upper third series Minghua group and a Librarian pottery group respectively. By referring to the history and geological data of the drilled temporary well, the main leakage interval of the bench well is in a curatoria pottery group with the well depth of 2260-2670 meters.
The well spacing of the three wells is 20m, and H5 has the same complete drilling interval, the same well type, the same drilling block, the same lost interval and the same geological and lithological properties of a leaking layer as the bench sub-well. What is different is that the ground stress distribution of the stratum to be drilled by each well, the thickness of the pore-fracture leakage layer, the pore size, the fracture opening degree, the fracture width, the directional well deflection angle and other different factors influence the leakage stopping effect.
The occurrence of the well leakage is mainly determined by the geological structure and the stratum rock property of the sandstone of the ceramic group of the stratums to be drilled. The well leakage of the sandstone stratum of the Librarian pottery is determined by factors such as loose cementation of sandstone debris, large amount of conglomerates, drillability of rocks, hardness of the rocks, mineral compositions of the rocks, development degree of pores of the rocks and the like; therefore, the H5 same sub well is selected as a plugging material composition for medium-small loss plugging, and a test well group is applied to field plugging.
When the three inclined wells are constructed on site, because the condition of the site leakage stratum is complex and difficult to judge, the proportion and the dosage of the plugging material composition are determined by measuring and calculating the leakage speed, and the site plugging test is completed.
Example 7
H5-1 well, after drilling 2357 meters deep, began to show signs of loss. The method is characterized in that the inclination angle is about 45 degrees at 2357-2370m well section (the well temperature is 70-72 ℃), the length of the inclined well section is 800m, and the total loss is 29.85m as shown by a mud liquid tank ruler3And the leakage velocity is measured and calculated to be 14.87m3And/h is lost. At the moment, the pumping discharge capacity of the drilling fluid is reduced to 25L/s, the viscosity of a drilling fluid funnel is 36s, the plastic viscosity is 14mPa & s, and the density of the drilling fluid is 1.12g/cm3。
Based on the above problem, 50m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 20 parts by weight of water-swellable polymer particles, 15 parts by weight of sawdust, 15 parts by weight of bagasse, 10 parts by weight of reed straw chips, 15 parts by weight of asbestos fibers, 10 parts by weight of hazelnut shell chips and 15 parts by weight of rice hull chips; wherein, the water-swelling polymer particles are a copolymer (with the number-average molecular weight of 1600 ten thousand) prepared by copolymerization of 30 parts by weight of acrylamide, 10 parts by weight of methyl acrylate, 10 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 3:5) and 10 parts by weight of II type monomers; the structural formula of the II type monomer is as follows:
Figure BDA0002250234340000151
R1is composed of
Figure BDA0002250234340000152
The pumping capacity of the drilling fluid is reduced to 23L/s, and the drilling is continued to 2362 m. At this point, the mud pot scale is lifted. The values after lifting showed a 3.3m rise over that before loss3. The discharge capacity is increased to 26L/s, the drilling is continued to 2367m, and the scale of the mud liquid tank is not changed. And the discharge capacity is continuously increased to 33L/s, the drilling is continuously carried out to 2375m, and the scale of the mud liquid tank is not changed. The displacement is kept until the drilling is finished, which indicates that the plugging operation is successful.
Example 8
H5-2 well, drilled to 2265 m depth, began to show signs of loss. The method is characterized in that the total loss is 60.25m as shown by a staff gauge of a mud liquid tank, wherein the inclination angle is about 90 degrees at 2265-2275m well section (the well temperature is 68-70 ℃), the length of the inclined well section is 1200m3And the leakage rate is measured and calculated to be 30.57m3And/h is lost. At the moment, the pumping discharge capacity of the drilling fluid is reduced to 28L/s, the viscosity of a drilling fluid funnel is 35s, the plastic viscosity is 14mPa & s, and the density of the drilling fluid is 1.12g/cm3。
Based on the above problem, 100m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 20 parts by weight of water-swellable polymer particles, 20 parts by weight of sawdust, 10 parts by weight of bagasse, 20 parts by weight of reed straw chips, 10 parts by weight of calamus chips, 20 parts by weight of glass fibers, 10 parts by weight of asbestos fibers, 20 parts by weight of hazelnut shell chips and 15 parts by weight of rice hull chips; wherein, the water-swelling polymer particles are copolymer (with the number-average molecular weight of 1800 ten thousand) prepared by copolymerization of 30 parts by weight of acrylamide, 10 parts by weight of methyl acrylate, 10 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 3:2) and 10 parts by weight of II type monomer; the structural formula of the II type monomer is as follows:
Figure BDA0002250234340000161
R2is C2H5，R3Is composed of
Figure BDA0002250234340000162
The drilling fluid pumping capacity is reduced to 26L/s, and drilling is continued to 2262 m. At this point, the mud pot scale is lifted. The values after lifting showed a 2.1m rise over before loss3. The discharge capacity is increased to 29L/s, the drilling is continued to 2267m, and the scale of the slurry tank is not changed. And the discharge capacity is continuously increased to 33L/s, the drilling is continuously carried out to 2280m, and the scale of the slurry tank is not changed. The displacement is kept until the drilling is finished, which indicates that the plugging operation is successful.
Example 9
H5-3 well, drilling to 2585 meters deep, beginning to show signs of loss. The method is characterized in that the total loss is 42.85m when the slope angle is 35 degrees and the length of the inclined shaft section is 800m under the conditions that the well temperature is between 78 and 80 ℃ and the well section is between 2585 and 2615m, and the scale of a mud liquid tank displays that the total loss is 42.85m3And the leakage velocity is measured and calculated to be 20.62m3And/h is lost. At the moment, the pumping capacity of the drilling fluid is reduced to 26L/s, the viscosity of a drilling fluid funnel is 37s, the plastic viscosity is 14mPa & s, and the density of the drilling fluid is 1.12g/cm3。
Based on the above problem, 70m3Base slurry (5 wt.% bentonite slurry) per 1m3And adding 500kg of plugging composition into the base slurry to prepare the plugging slurry, and performing conventional plugging operation while drilling.
Specifically, the plugging composition consists of 30 parts by weight of water-swellable polymer particles, 15 parts by weight of sawdust, 10 parts by weight of bagasse, 20 parts by weight of reed straw chips, 10 parts by weight of calamus chips, 10 parts by weight of glass fibers, 10 parts by weight of asbestos fibers, 20 parts by weight of hazelnut shell chips and 10 parts by weight of rice hull chips; wherein, the water-swelling polymer particles are a copolymer (with the number-average molecular weight of 1800 ten thousand) prepared by copolymerization of 30 parts by weight of acrylamide, 10 parts by weight of methyl acrylate, 10 parts by weight of a mixture of potassium acrylate and sodium acrylate (the molar ratio of the two is 3:5) and 10 parts by weight of I-type monomer; the structural formula of the I type monomer is as follows:
Figure BDA0002250234340000171
R1is composed of
Figure BDA0002250234340000172
And the pumping capacity of the drilling fluid is reduced to 24L/s, and the drilling is continued to 2590 m. At this point, the mud pot scale is lifted. The values after lifting showed a 2.4m rise over before loss3. The discharge capacity is increased to 26L/s, the drilling is continued to 2605m, and the scale of the slurry tank is not changed. And continuously increasing the discharge capacity to 30L/s, and continuously drilling to 2615m, wherein the scale of the slurry tank is not changed. And the discharge capacity is continuously increased to 33L/s, the drilling is continuously carried out to 2625m, and the scale of the slurry tank is not changed. The displacement is kept until the drilling is finished, which indicates that the plugging operation is successful.
In conclusion, the plugging composition suitable for medium-small leakage plugging can be widely applied to plugging construction operation of vertical wells and inclined wells.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are included in the protection scope of the present invention.

Claims (7)

1. A plugging composition suitable for medium-small leakage plugging is characterized by comprising a component A, a component B, a component C and a component D, wherein,
the component A is water-absorbing expansion plugging polymer particles, and is a copolymer which is formed by copolymerizing a first monomer, a second monomer, a third monomer and a fourth monomer and has the number average molecular weight of 1600-2400 ten thousand; the first monomer is acrylamide, the second monomer is at least one of methyl acrylate and butyl acrylate, the third monomer is at least one of potassium acrylate, sodium acrylate and acrylic acid, and the fourth monomer is a double-bond-containing I-type monomer and/or II-type monomer; wherein,
the chemical structural formula of the type I monomer is as follows:
Figure FDA0003213316410000011
wherein R is1Is composed of
Figure FDA0003213316410000012
The chemical structural formula of the type II monomer is as follows:
Figure FDA0003213316410000013
wherein R is2Is C2H5Or C3H7；R3Is composed of
Figure FDA0003213316410000014
Or
Figure FDA0003213316410000015
The particle size of the water-absorbing swelling plugging polymer particles is 20-40 meshes;
the component B is at least one of coke particles and hazelnut shell fragments; wherein the particle size of the coke particles is 20-40 meshes; the particle size of the hazelnut shell fragments is 10-20 meshes;
the component C is glass fiber and/or asbestos fiber; wherein the diameter of a single fiber of the glass fiber is 30-50 nm; the diameter of a single fiber of the asbestos fiber is 20-50 nm;
the component D adopts a mixture of sawdust, bagasse, reed straw scraps and rice hull scraps, or a mixture of sawdust, bagasse, reed straw scraps, calamus scraps and rice hull scraps; wherein the sawdust is formed by mixing 10-20 parts by weight of sawdust with a particle size of 20-40 meshes, 10-20 parts by weight of sawdust with a particle size of 60-80 meshes and 10-20 parts by weight of sawdust with a particle size of 100-120 meshes; the grain size of the bagasse is 20-40 meshes; the particle size of the reed straw scraps is 5-20 meshes; the particle size of the calamus chippings is 5-10 meshes; the grain size of the rice hull scraps is 20-40 meshes;
the leakage stoppageThe composition is prepared by mixing 20-40 parts by weight of component A, 10-20 parts by weight of component B, 10-40 parts by weight of component C and 40-75 parts by weight of component D, and is used for blocking leakage at a leakage rate of 10-20 m3A formation under a small leak-off condition of/h; the plugging composition is prepared by mixing 30-40 parts by weight of component A, 15-20 parts by weight of component B, 15-40 parts by weight of component C and 50-75 parts by weight of component D, and is used for plugging the leakage rate of 20-50 m3The formation in a medium leak-off condition of/h.
2. The plugging composition suitable for medium-small leakage plugging according to claim 1, wherein the sawdust is prepared by mixing dry alkalized pine sawdust obtained by soaking in 10-20 wt.% sodium hydroxide or potassium hydroxide solution for 48 hours and airing for 72 hours, and dry alkalized poplar sawdust obtained by soaking in 10-20 wt.% sodium hydroxide or potassium hydroxide solution for 48 hours and airing for 72 hours, and the weight ratio of the two is 1: 1.
3. The plugging composition suitable for medium-small leakage plugging according to claim 1, wherein the reed straw scraps are prepared by crushing dry alkalized reed straws obtained by soaking in 10-20 wt.% sodium hydroxide or potassium hydroxide solution for 72 hours and airing for 3-6 months.
4. The plugging composition for medium-small leakage plugging according to claim 1, wherein the calamus chips are prepared by crushing dry alkalized calamus obtained by soaking in 10-20 wt.% sodium hydroxide or potassium hydroxide solution for 72h and air-drying for 3-6 months.
5. A lost circulation composition suitable for medium-small loss of leakage plugging according to claim 1, wherein the length of the single fiber of the glass fiber is 10-15 mm.
6. A lost circulation composition suitable for medium-small loss of circulation plugging according to claim 1, wherein the asbestos fibers have a single fiber length of 10-15 mm.
7. The plugging composition suitable for medium-small leakage plugging according to claim 1, wherein the weight ratio of the first monomer, the second monomer, the third monomer and the fourth monomer is 10-40: 10-20: 10-15.
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