CN111793482A - Plugging slurry for program plugging and method for plugging drilling loss of oil and gas well - Google Patents
Plugging slurry for program plugging and method for plugging drilling loss of oil and gas well Download PDFInfo
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- CN111793482A CN111793482A CN202010633236.4A CN202010633236A CN111793482A CN 111793482 A CN111793482 A CN 111793482A CN 202010633236 A CN202010633236 A CN 202010633236A CN 111793482 A CN111793482 A CN 111793482A
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- 239000002002 slurry Substances 0.000 title claims abstract description 194
- 238000005553 drilling Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000002245 particle Substances 0.000 claims abstract description 95
- 239000012530 fluid Substances 0.000 claims description 57
- 230000001939 inductive effect Effects 0.000 claims description 52
- 239000000463 material Substances 0.000 claims description 33
- 230000000903 blocking effect Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 6
- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 8
- 230000000241 respiratory effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 19
- 235000019198 oils Nutrition 0.000 description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 5
- 239000010428 baryte Substances 0.000 description 5
- 229910052601 baryte Inorganic materials 0.000 description 5
- 239000002283 diesel fuel Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- 241000237858 Gastropoda Species 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 3
- 229910001628 calcium chloride Inorganic materials 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000003995 emulsifying agent Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000000080 wetting agent Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920002907 Guar gum Polymers 0.000 description 2
- 241000758789 Juglans Species 0.000 description 2
- 235000009496 Juglans regia Nutrition 0.000 description 2
- 239000002199 base oil Substances 0.000 description 2
- 235000012343 cottonseed oil Nutrition 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000665 guar gum Substances 0.000 description 2
- 229960002154 guar gum Drugs 0.000 description 2
- 235000010417 guar gum Nutrition 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 235000020234 walnut Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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- 239000010959 steel Substances 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
- C09K8/42—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
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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
- C09K8/46—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
-
- 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
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- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention provides a plugging slurry for program plugging and a method for plugging drilling loss of an oil and gas well, belonging to the technical field of oil and gas field exploration and development plugging. The plugging slurry for program plugging can be accumulated at the seam points, the seam centers and the seam mouths of cracks, can effectively plug the seam points, the seam centers and the seam mouths of the leaking cracks, and has high success rate of primary plugging. According to the leakage stopping method, the leakage stopping slurry with small particle size is pumped firstly, then the leakage stopping slurry with large particle size is pumped, the particle size of the induced particles in the multistage leakage stopping slurry is gradually reduced from top to bottom in the shaft, so that the particle size of the leakage stopping slurry sequentially enters the crack from small to large in the construction process, the leakage stopping slurry is accumulated at the tip, in the crack and at the seam opening of the crack, the tip, in the seam and at the seam opening of the leakage crack are effectively stopped, and the success rate of primary stopping is high; the re-leakage caused by re-spitting and re-opening of cracks due to the respiratory action of the stratum is avoided; and the application range is wide, and the method is effective for leakage to loss return leakage.
Description
Technical Field
The invention relates to the technical field of oil and gas field exploration and development leakage stoppage, in particular to leakage stoppage slurry for program leakage stoppage and a method for stopping leakage of drilling well of an oil and gas well.
Background
Loss is a problem commonly encountered in the drilling process and can be generally classified into high permeability loss, induced fracture loss, natural fracture loss, large fracture and karst cave loss, and from small leakage to loss-of-return loss can occur. The sizes of cracks cannot be observed, judgment cannot be made, plugging operation is empirically performed, the particle size in a plugging slurry formula is high in randomness, the particle size is selected to be small, plugging fails, the particle size is selected to be large, plugging slurry seals a door, the successful false appearance of plugging is caused, the plugging is recovered, and the proper particle size distribution can be found out after repeated plugging.
Conventional plugging materials currently produce the following results: 1) the plugging material with single grain diameter can be distributed at the seam point, the seam middle and the seam opening during plugging. If the steel wire pile is accumulated at the seam tip, the leakage cannot be well improved, and the leakage still occurs in the subsequent construction; if the slurry is accumulated in the seam, the slurry can be improved to a certain extent, and the slurry leakage speed can be reduced; the sealing door can be generated due to the accumulation of the seam, the sealing door can be back-discharged due to the respiration of the stratum, so that the plugging is invalid, and even if the back-discharge is not generated, the plugging material of the seam can be circularly taken away in the subsequent drilling circulation process, so that the plugging is invalid. Meanwhile, repeated construction is generally needed for many times during plugging, and the operation time and cost are increased. 2) The plugging materials with certain particle sizes are easy to accumulate at the seam to seal the door in the construction process, so that the plugging materials cannot enter the seam, and the one-time plugging success rate is not high.
Therefore, a plugging material with high success rate is needed to improve the effective plugging rate, save the construction time and save the cost.
Disclosure of Invention
In view of the above, the present invention aims to provide a plugging slurry for program plugging and a method for plugging drilling loss of an oil and gas well, wherein the plugging slurry for program plugging can be accumulated at the tip, middle and mouth of a crack, and can effectively plug the tip, middle and mouth of the leakage crack, and the success rate of one-time plugging is high.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a leakage stopping slurry for program leakage stopping, which comprises independently subpackaged multistage leakage stopping slurries, and specifically comprises the following components: basic leakage-stopping slurry, first-stage leakage-stopping slurry, second-stage leakage-stopping slurry, … … and Nth-stage leakage-stopping slurry; the first-stage leakage stopping slurry comprises basic leakage stopping slurry and first-stage inducing particles, the second-stage leakage stopping slurry comprises first-stage leakage stopping slurry and second-stage inducing particles, … …, and the Nth-stage leakage stopping slurry comprises Nth-1-stage leakage stopping slurry and Nth-stage inducing particles; the foundation leakage blocking slurry comprises a foundation liquid and a leakage blocking material;
the maximum grain size of the plugging material is less than the grain size of the first-stage inducing particles, less than the grain size of the second-stage inducing particles, less than … … and less than the grain size of the Nth-stage inducing particles;
n is a positive integer greater than or equal to 1;
the base fluid has a density that is the same as the density of the drilling fluid in the wellbore.
Preferably, the dosage ratio of the base fluid to the plugging material is 1m3：(1～300)kg。
Preferably, the particle size of the plugging material is less than 1.5 mm.
Preferably, the base fluid is one or more of a drilling fluid, a suspension, a glue solution and a gel.
Preferably, the particle size of the first-stage inducing particles is 1-4 mm; the particle size of the Nth-stage inducing particles is 1-2 mm larger than that of the Nth-1 stage inducing particles.
Preferably, the dosage ratio of the first-stage inducing particles to the basic plugging slurry in the first-stage plugging slurry is (10-50) kg: 1m3(ii) a The dosage ratio of the second-stage inducing particles to the first-stage leakage plugging slurry in the second-stage leakage plugging slurry is (10-50) kg: 1m3；……(ii) a The dosage ratio of the Nth level inducing particles to the Nth-1 level plugging slurry in the Nth level plugging slurry is (10-50) kg: 1m3。
The invention also provides a method for plugging the drilling loss of the oil and gas well by the plugging slurry for program plugging, which comprises the following steps:
(1) preparing the leakage stopping slurry for stopping the leakage by the procedure in the technical scheme;
(2) putting a drill rod into the well drilling leakage layer of the oil and gas well for 20-50 m;
(3) sending the plugging slurry for program plugging to a drill rod according to the sequence of basic plugging slurry, first-stage plugging slurry, second-stage plugging slurry, … … and Nth-stage plugging slurry, replacing with drilling fluid, stopping replacing when the height of the basic plugging slurry in the drill rod is consistent with the height of the annulus, and lifting the drill rod to the top of the first-stage plugging slurry; and continuously replacing the first-stage plugging slurry, stopping replacing when the height of the first-stage plugging slurry in the drill rod is consistent with the height of the annulus, lifting the drill rod to the top of the first-stage plugging slurry, and circulating the steps until the well shut-in pressure extrusion and injection pressure is stable.
The invention provides a leakage stopping slurry for program leakage stopping, which comprises independently subpackaged multistage leakage stopping slurries, and specifically comprises the following components: basic leakage-stopping slurry, first-stage leakage-stopping slurry, second-stage leakage-stopping slurry, … … and Nth-stage leakage-stopping slurry; the first-stage leakage stopping slurry comprises basic leakage stopping slurry and first-stage inducing particles, the second-stage leakage stopping slurry comprises first-stage leakage stopping slurry and second-stage inducing particles, … …, and the Nth-stage leakage stopping slurry comprises Nth-1-stage leakage stopping slurry and Nth-stage inducing particles; the foundation leakage blocking slurry comprises a foundation liquid and a leakage blocking material; the maximum grain size of the plugging material is less than the grain size of the first-stage inducing particles, less than the grain size of the second-stage inducing particles, less than … … and less than the grain size of the Nth-stage inducing particles; n is a positive integer greater than or equal to 1; the base fluid has a density that is the same as the density of the drilling fluid in the wellbore. The leakage stopping slurry for program leakage stopping provided by the invention comprises different levels of leakage stopping slurry, the particle size of the largest particles in each level of leakage stopping slurry is gradually increased, and the induced particles with different particle sizes can induce the leakage stopping materials to be accumulated at different positions of cracks, such as the top, middle and mouth of the cracks, so as to form sand blocking, realize effective blocking, and have high success rate of one-time blocking.
The invention also provides a method for plugging the drilling leakage of the oil and gas well by using the plugging slurry for program plugging, which is characterized in that the basic plugging slurry is pumped firstly, then the first-stage plugging slurry, … …, and then the Nth-stage plugging slurry are pumped, the particle size of the largest particle in each-stage plugging slurry is distributed in the shaft from top to bottom in a large and small mode, so that the largest particle of each-stage plugging slurry enters the crack in sequence from small to large in the construction process, plugging material particles are accumulated at the tip, in the crack and at the opening of the crack, the tip, in the crack and at the opening of the leakage crack are plugged effectively, and the success rate of primary plugging is high. The method provided by the invention avoids the repeated leakage caused by the respiration of the stratum, the return flow and the reopening of the crack; and the application range is wide, and the method is effective for leakage to loss return leakage.
Drawings
Fig. 1 is a schematic diagram of distribution of a multi-stage plugging material in a well bore in the programmed plugging method for oil and gas well drilling loss provided by the invention.
Detailed Description
The invention provides a leakage stopping slurry for program leakage stopping, which comprises independently subpackaged multistage leakage stopping slurries, and specifically comprises the following components: basic leakage-stopping slurry, first-stage leakage-stopping slurry, second-stage leakage-stopping slurry, … … and Nth-stage leakage-stopping slurry; the first-stage leakage stopping slurry comprises basic leakage stopping slurry and first-stage inducing particles, the second-stage leakage stopping slurry comprises first-stage leakage stopping slurry and second-stage inducing particles, … …, and the Nth-stage leakage stopping slurry comprises Nth-1-stage leakage stopping slurry and Nth-stage inducing particles; the foundation leakage blocking slurry comprises a foundation liquid and a leakage blocking material;
the maximum grain size of the plugging material is less than the grain size of the first-stage inducing particles, less than the grain size of the second-stage inducing particles, less than … … and less than the grain size of the Nth-stage inducing particles;
n is a positive integer greater than or equal to 1;
the base fluid has a density that is the same as the density of the drilling fluid in the wellbore.
In the present invention, the base fluid is preferably the same density as the drilling fluid in the wellbore. In the present invention, the base fluid is preferably an in situ drilling fluid and/or a carrier fluid. In the present invention, for oil-based field drilling fluids, the carrier fluid preferably comprises a base oil, an emulsifier, a wetting agent, an organic soil, an aqueous calcium chloride solution, and a weighting agent; the base oil is white oil or diesel oil; the mass concentration of the calcium chloride aqueous solution is 25%; in a particular embodiment of the invention, the carrier fluid preferably comprises, for an oil-based field drilling fluid: 12m3Diesel oil +480kg field emulsifier +240kg field wetting agent +300kg field organic soil +4m3Calcium chloride aqueous solution +10000kg barite. For water-based field drilling fluids, the carrier fluid preferably comprises water, a viscosifying agent, and a weighting agent; the water is preferably fresh water or sea water. In the present invention, the material in the carrier fluid is selected from the materials in the in situ drilling fluid; in a particular embodiment of the invention, for water-based field drilling fluids, the carrier fluid preferably comprises: 25m3Sea water +240kg guar gum +9997kg barite.
In the present invention, when the density of the base fluid is less than that of the drilling fluid, it is preferable to add barite to make the density of the base fluid meet the requirements.
In the invention, the particle size of the plugging material is preferably less than 1.5mm, the source of the plugging material is not particularly limited, and in order to save cost, the plugging material is preferably selected according to the field condition, so long as the particle size requirement is met; specifically, for example, walnut shells, cottonseed shells, fibers, calcium carbonate mixtures or commercially available lost circulation materials are selected on site.
In the present invention, the ratio of the base fluid to the plugging material is preferably 1m3: (10 to 300) kg, more preferably 1m3: (50-250) kg, more preferably 1m3：(100～200)kg。
In the invention, the dosage ratio of the first-stage inducing particles to the basic plugging slurry in the first-stage plugging slurry is preferably (10-50) kg: 1m3More preferably (20 to 40) kg: 1m3More preferably 30 kg: 1m3(ii) a The particle size of the first-stage inducing particles is preferably 1-4 mm.
In the invention, the dosage ratio of the second-stage inducing particles to the first-stage plugging slurry in the second-stage plugging slurry is preferably (10-50) kg: 1m3More preferably (20 to 40) kg: 1m3More preferably 30 kg: 1m3(ii) a The grain size of the second-stage inducing particles is preferably 1-2 mm larger than that of the first-stage inducing particles.
In the invention, the dosage ratio of the Nth level inducing particles to the Nth-1 level plugging slurry in the Nth level plugging slurry is preferably (10-50) kg: 1m3More preferably (20 to 40) kg: 1m3More preferably 30 kg: 1m3(ii) a The particle size of the Nth-stage inducing particles is preferably 1-2 mm larger than that of the Nth-1-stage inducing particles.
In the invention, the first stage inducing particles, the second stage inducing particles, … … and the Nth stage inducing particles are preferably made of particle materials which are insoluble in water, diesel oil and white oil, and meet the requirements of site pressure bearing and temperature, in particular inert inorganic particles, organic particles or synthetic-based particles, such as limestone particles or cement stone particles.
The invention also provides a method for plugging the drilling loss of the oil and gas well by using the plugging slurry for program plugging, which comprises the following steps:
(1) preparing the leakage stopping slurry for stopping the leakage by the procedure in the technical scheme;
(2) putting a drill rod into the well drilling leakage layer of the oil and gas well for 20-50 m;
(3) sending the plugging slurry for program plugging to a drill rod according to the sequence of basic plugging slurry, first-stage plugging slurry, second-stage plugging slurry, … … and Nth-stage plugging slurry, replacing with drilling fluid, stopping replacing when the height of the basic plugging slurry in the drill rod is consistent with the height of the annulus, and lifting the drill rod to the top of the basic plugging slurry; and continuously replacing the first-stage plugging slurry, stopping replacing when the height of the first-stage plugging slurry in the drill rod is consistent with the height of the annulus, lifting the drill rod to the top of the first-stage plugging slurry, and circulating the steps until the well shut-in pressure extrusion and injection pressure is stable.
The invention relates to leakage stopping slurry for stopping leakage by a preparation procedure.
In the invention, N is a positive integer greater than or equal to 1.
The invention does not specifically limit the dosage of the basic leakage-stopping slurry, the first-stage leakage-stopping slurry, the second-stage leakage-stopping slurry and the … … Nth-stage leakage-stopping slurry and the total quantity of the N-stage leakage-stopping slurry.
The method is characterized in that a drill rod is put into the well drilling leakage layer of the oil-gas well for 20-50 m.
In the invention, the descending drill rod is preferably 25-45 m above the drilling leakage layer of the oil and gas well, and more preferably 30-40 m.
The method for setting the drill rod is not particularly limited, and the setting method known to those skilled in the art can be adopted.
After preparing the plugging slurry for program plugging and putting a drill rod into the drilling rod, the plugging slurry for program plugging is sent into the drill rod in the sequence of the basic plugging slurry, the first-stage plugging slurry, the second-stage plugging slurry, … … and the Nth-stage plugging slurry, the replacement is carried out by the drilling fluid, when the height of the basic plugging slurry in the drill rod is consistent with the height of an annulus, the replacement is stopped, and the drill rod is lifted to the top of the basic plugging slurry; and continuously replacing the first-stage plugging slurry, stopping replacing when the height of the first-stage plugging slurry in the drill rod is consistent with the height of the annulus, lifting the drill rod to the top of the first-stage plugging slurry, and circulating the steps until the well shut-in pressure extrusion and injection pressure is stable after plugging is successful.
In the invention, after the replacement of the plugging slurry is finished, the invention carries out pressurization extrusion and injection and then carries out plugging test. The parameters of the pressurized squeeze are not particularly limited in the present invention.
In the invention, when the pressure of the pressurizing and squeezing is not reduced continuously, the pressure is held for 0-12 h, the pressure is stable, and a plugging test is carried out; the plugging test comprises the following steps: the drill rod is put in to circulate the residual plugging slurry out of the shaft, the drilling fluid circulates in the shaft for two weeks, and the amount of the drilling fluid is not reduced, so that the plugging is successful; if the drilling fluid amount is reduced, the plugging is unsuccessful, and plugging is continued according to the technical scheme.
FIG. 1 is a schematic diagram of the distribution of multi-stage plugging materials in a well bore in the programmed plugging method for oil and gas well drilling loss provided by the invention; and in the shaft, foundation leakage stopping slurry, first-stage leakage stopping slurry, second-stage leakage stopping slurry, third-stage leakage stopping slurry and fourth-stage leakage stopping slurry … … are filled above the stratum leakage point in sequence.
The plugging slurry for process plugging and the method for plugging the drilling loss of the oil and gas well provided by the invention are described in detail by combining the following embodiments, but the invention is not to be construed as limiting the scope of the invention.
Example 1
The lost-return leakage occurs when a certain oil field 81/2' well bore is drilled to 4323m, the drilling fluid is diesel oil base drilling fluid, and the density is 1.42g/cm3。
The plugging slurry is divided into four slugs on site:
base liquid: 15m3Drilling fluid +15m on site3Carrying fluid; the formula of the carrying fluid is as follows: 12m3Diesel oil +480kg field emulsifier +240kg field wetting agent +300kg field organic soil +4m3Calcium chloride aqueous solution +10000kg barite.
And (3) plugging slurry of a foundation: 30m33000kg of a base liquid and a plugging material with the particle size of less than 1 mm; the leak stoppage material is a mixture of walnut shells, cottonseed shells and mica sheets in a mass ratio of 1:1: 1;
first-stage leakage plugging slurry: 25m3Basic plugging slurry +450kg of first-stage inducing particles (limestone particles) having a particle size of 1 mm.
Second-stage leakage plugging slurry: 10m3The first stage plugging slurry +150kg of second stage inducing particles (limestone particles) having a particle size of 4.5 mm.
Third-stage leakage plugging slurry: 5m3The second stage plugging slurry +50kg of third stage inducing particles (limestone particles) having a particle size of 7 mm.
The construction process is as follows:
(1) 5' lower smooth drill rod is arranged to 4300 m;
(2) preparing base liquid and 4 plugging slurry slugs;
(3) pump 5m315m of foundation plugging slurry3First stage of leakage stoppage slurry, 5m3Second stage leakage stoppage slurry and 5m3Third-stage leakage plugging slurry;
(4) pump 11.7m3Replacing a base leakage plugging slurry slug into a shaft by the field drilling fluid, stopping a pump, and lifting a drill rod 136m to the top of the base leakage plugging slurry;
(5) the pump is started and continues to pump for 11m3Drilling fluid on site, stopping the pump, and lifting a drill rod 408m to the top of the first-stage plugging slurry;
(6) the pump is started and continues to pump for 7.2m3Drilling fluid on site, stopping the pump, and lifting a drill rod 272m to the top of the second-stage plugging slurry;
(7) the pump is started and continues to pump for 3.6m3Drilling fluid on site, stopping the pump, and lifting a drill rod by 150m to the top of the third-stage plugging slurry;
(8) closing the well, building pressure and squeezing for 15m3After drilling fluid is drilled on site, keeping the extrusion force at 5MPa stably;
(9) continuing to hold the pressure for 12 hours under the pressure of 5 MPa;
(10) and (4) well opening, pressure relief, drill pipe descending circulation, no leakage and successful plugging.
Example 2
When a certain oil field drills to 3936m, permeability loss occurs, and the leakage speed is 0.7-1.0 m3The drilling fluid is seawater-based drilling fluid with the density of 1.28g/cm3。
The plugging slurry is divided into 3 slugs on site:
the base fluid is carrying fluid: 25m3 seawater, 240kg guar gum, 9997kg barite added to a base fluid density of 1.28g/cm3。
And (3) plugging slurry of a foundation: 25m3The base liquid plus 3000kg of the plugging material (single sealing material) with the grain diameter of less than 1 mm;
first-stage leakage plugging slurry: 20m3Basic plugging slurry +300kg of first-stage inducing particles (cement stone particles) with the particle size of 1 mm;
second-stage leakage plugging slurry: 5m3The primary plugging slurry +100kg of secondary inducing particles (cement stone particles) having a particle size of 3 mm.
The construction process is as follows:
(1) a smooth drill rod is lowered to 3900 m;
(2) preparing a base solution, base leakage-stopping slurry, first-stage leakage-stopping slurry and second-stage leakage-stopping slurry;
(3) pumping5m310m of foundation leakage-stopping slurry3First stage of leakage stoppage slurry, 5m3Second-stage leakage plugging slurry;
(4) pumping the field drilling fluid to replace the plugging slurry slug into the shaft, and taking the basic plugging slurry, the first-stage plugging slurry and the second-stage plugging slurry from bottom to top;
(5) closing the well, building pressure and squeezing for 15m3After the drilling fluid is drilled on site, the pressure is stabilized at 3 MPa;
(6) continuing to hold the pressure for 12h at 3 MPa;
(7) and (4) well opening, pressure relief and drilling circulation are carried out, no leakage exists, and plugging is successful.
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 (7)
1. The utility model provides a procedure is leaking stoppage thick liquid for leaking stoppage, which characterized in that, including the multistage leaking stoppage thick liquid of independent partial shipment, specifically be: basic leakage-stopping slurry, first-stage leakage-stopping slurry, second-stage leakage-stopping slurry, … … and Nth-stage leakage-stopping slurry; the first-stage leakage stopping slurry comprises basic leakage stopping slurry and first-stage inducing particles, the second-stage leakage stopping slurry comprises first-stage leakage stopping slurry and second-stage inducing particles, … …, and the Nth-stage leakage stopping slurry comprises Nth-1-stage leakage stopping slurry and Nth-stage inducing particles; the foundation leakage blocking slurry comprises a foundation liquid and a leakage blocking material;
the maximum grain size of the plugging material is less than the grain size of the first-stage inducing particles, less than the grain size of the second-stage inducing particles, less than … … and less than the grain size of the Nth-stage inducing particles;
n is a positive integer greater than or equal to 1;
the base fluid has a density that is the same as the density of the drilling fluid in the wellbore.
2. The slurry for program plugging according to claim 1, wherein the ratio of the amount of the base fluid to the amount of the plugging material is 1m3：(1～300)kg。
3. The slurry for program plugging according to claim 1 or 2, wherein the particle size of the plugging material is less than 1.5 mm.
4. The plugging slurry for program plugging according to claim 1 or 2, wherein the base fluid is one or more of a drilling fluid, a suspension, a glue solution and a gel.
5. The leakage stoppage slurry for program leakage stoppage according to claim 1, wherein the particle size of the first-stage inducing particles is 1 to 4 mm; the particle size of the Nth-stage inducing particles is 1-2 mm larger than that of the Nth-1 stage inducing particles.
6. The plugging slurry for program plugging according to claim 1, wherein the ratio of the dosage of the first-stage inducing particles to the basic plugging slurry in the first-stage plugging slurry is (10-50) kg: 1m3(ii) a The dosage ratio of the second-stage inducing particles to the first-stage leakage plugging slurry in the second-stage leakage plugging slurry is (10-50) kg: 1m3(ii) a … …, respectively; the dosage ratio of the Nth level inducing particles to the Nth-1 level plugging slurry in the Nth level plugging slurry is (10-50) kg: 1m3。
7. A method for plugging the drilling loss of an oil and gas well by using the plugging slurry for program plugging according to any one of claims 1 to 6, which is characterized by comprising the following steps of:
(1) preparing the plugging slurry for process plugging according to any one of claims 1 to 6;
(2) putting a drill rod into the well drilling leakage layer of the oil and gas well for 20-50 m;
(3) sending the plugging slurry for program plugging to a drill rod according to the sequence of basic plugging slurry, first-stage plugging slurry, second-stage plugging slurry, … … and Nth-stage plugging slurry, replacing with drilling fluid, stopping replacing when the height of the basic plugging slurry in the drill rod is consistent with the height of the annulus, and lifting the drill rod to the top of the first-stage plugging slurry; and continuously replacing the first-stage plugging slurry, stopping replacing when the height of the first-stage plugging slurry in the drill rod is consistent with the height of the annulus, lifting the drill rod to the top of the first-stage plugging slurry, and circulating the steps until the well shut-in pressure extrusion and injection pressure is stable.
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| CN112646555B (en) * | 2021-01-26 | 2023-05-05 | 陕西延长石油（集团）有限责任公司 | Three-stage plugging agent suitable for fractured lost stratum in extended area, preparation method thereof and plugging method |
| CN117147370A (en) * | 2023-10-31 | 2023-12-01 | 西南石油大学 | Method for quantitatively testing suitability of plugging material and drilling fluid |
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| CN117147370B (en) * | 2023-10-31 | 2023-12-22 | 西南石油大学 | Method for quantitatively testing suitability of plugging material and drilling fluid |
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