CN111763041A - Oil well cement slurry and casing cementing process in horizontal well technology - Google Patents
Oil well cement slurry and casing cementing process in horizontal well technology Download PDFInfo
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- CN111763041A CN111763041A CN202010473726.2A CN202010473726A CN111763041A CN 111763041 A CN111763041 A CN 111763041A CN 202010473726 A CN202010473726 A CN 202010473726A CN 111763041 A CN111763041 A CN 111763041A
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- 239000004568 cement Substances 0.000 title claims abstract description 121
- 239000003129 oil well Substances 0.000 title claims abstract description 85
- 239000002002 slurry Substances 0.000 title claims abstract description 44
- 238000005516 engineering process Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 13
- 150000003839 salts Chemical class 0.000 claims abstract description 53
- 239000000701 coagulant Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 11
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 229940044172 calcium formate Drugs 0.000 claims description 5
- 235000019255 calcium formate Nutrition 0.000 claims description 5
- 239000004281 calcium formate Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 22
- 230000015271 coagulation Effects 0.000 abstract description 8
- 238000005345 coagulation Methods 0.000 abstract description 8
- 238000006073 displacement reaction Methods 0.000 abstract description 8
- 239000012267 brine Substances 0.000 abstract description 7
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000001737 promoting effect Effects 0.000 abstract description 3
- 235000002639 sodium chloride Nutrition 0.000 description 48
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 238000005065 mining Methods 0.000 description 5
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910052901 montmorillonite Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- C09K8/422—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells specially adapted for sealing expandable pipes, e.g. of the non-hardening type
-
- 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
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses oil well cement slurry, which comprises 1 part of oil well cement, 1.1 to 1.35 parts of saturated saline, 0.018 to 0.03 part of oil well cement expanding agent and 0.002 to 0.003 part of coagulant; the invention also discloses a casing cementing process in the horizontal well technology, which comprises the following steps: A) establishing a horizontal well, and putting the technical casing into the borehole until reaching the horizontal section of the horizontal well; B) injecting oil well cement slurry into an annular space between the technical casing and the well wall, and then performing primary displacement operation to enable the oil well cement slurry to enter a salt layer top plate and an annular space between the technical casing below the salt layer top plate and the well wall, and remaining part of the oil well cement slurry in the technical casing; performing second replacement operation when the thixotropy is enhanced before the initial setting of the cement paste, performing third replacement operation when the initial setting thixotropy of the cement paste is the worst, and ejecting out a part of the residual oil well cement paste in the technical casing every time, wherein the residual part of the cement paste in the technical casing is left; C) solidifying; the invention can greatly reduce the gap between cement and a well hole, complete pressure maintaining and coagulation promoting, effectively seal and separate a light salt water channel, has good well cementation quality, prevents the salt bed top plate from permeating water, and ensures the brine outlet concentration and the production life of a well group.
Description
Technical Field
The invention relates to oil well cement slurry and a horizontal well technology casing cementing process using the same.
Background
At present, in the underground mining process of a well mineral salt mine, the drilling construction of a horizontal well is a very important link, particularly the well cementation quality of a productive technology casing pipe directly determines the brine outlet concentration and the production life of the well group; however, during geological deposition of rock salt, water filling possibility exists near the top plate of a salt layer, and the phenomenon is particularly remarkable in old mining areas. When the old mining area is excavated and developed, the probability of well kick and well leakage occurring when the old mining area is drilled to the position near the top plate of the salt layer is very high, and well killing or well cementation is needed because the old mining area is often associated with the adjacent mined rock salt cavity; in the existing horizontal well technology casing well cementation process, cement and clean water are mixed, and cement slurry is injected into an annular space between a technical casing and a well wall through the technical casing; however, in the cement slurry solidification process, more free water is separated out, gaps among cement bodies are more, pressure maintaining and coagulation accelerating cannot be completed, the setting time is longer, the cement slurry is easily corroded by a salt layer and light salt water near a top plate, the gaps between the cement slurry and the salt layer are also larger, a light salt water channel cannot be sealed, the well cementation quality is poor, the leakage stoppage effect is very small, the top plate of the salt layer is seriously permeable, the brine concentration of a well group analyzed according to the salt layer dissolution characteristic cannot be guaranteed, and the brine concentration and the production life of the well group are influenced.
Disclosure of Invention
The invention aims to provide oil well cement slurry and a casing cementing process in a horizontal well technology, aiming at the defects in the prior art, which can greatly reduce the gap between cement and a salt layer, complete pressure maintaining and coagulation promotion, effectively seal a light salt water channel, have good cementing quality, prevent the top plate of the salt layer from permeating water, and ensure the brine concentration and the production life of a well group.
In order to achieve the above object, the present invention provides an oil-well cement slurry comprising 1 part of oil-well cement; it is characterized by also comprising: 1.1 to 1.35 portions of saturated saline, 0.018 to 0.03 portion of oil well cement expanding agent and 0.002 to 0.003 portion of coagulant are mixed evenly according to the mass ratio.
The oil well cement is G-grade oil well cement and can resist high temperature and high pressure; the coagulant is calcium chloride or calcium formate;
the casing cementing process adopting the horizontal well technology of the oil well cement slurry comprises the following steps: A) establishing a horizontal well, and putting the technical casing into the borehole until reaching the horizontal section of the horizontal well, wherein the horizontal section is positioned below the salt layer top plate; b) Injecting the oil well cement slurry into an annulus between the technical casing and a well wall through the technical casing, and then carrying out primary replacement operation to enable the oil well cement slurry to enter a salt layer top plate and an annulus between the technical casing below the salt layer top plate and the well wall, and simultaneously enabling the residual oil well cement slurry in the technical casing to be residual; performing second replacement operation when the thixotropy is enhanced before the initial setting of the cement paste, and ejecting a part of the residual oil well cement paste in the technical casing; performing third replacement operation when the initial setting thixotropy of the cement paste is the worst, and ejecting a part of the residual oil well cement paste in the technical casing and the residual part of the cement paste in the technical casing; C) and (5) after the oil well cement slurry outside the technical casing is solidified, completing the lower part well cementation of the technical casing.
The invention uses saturated salt water, when the cement paste is solidified, the precipitated salt water can not dilute and take away solid salt in a salt layer, the gap between the saturated salt water and the salt layer is prevented from being enlarged, the volume of the cement paste is expanded by adding an expanding agent, the gap between the saturated salt water and the salt layer and small gaps inside the cement paste can be filled, the saturated salt water has a retarding effect, when the coagulant is added in three-time displacement operation, part of oil well cement paste is ejected out each time, pressure maintaining and coagulation accelerating can be completed on various gaps, the cement paste is prevented from being eroded by light salt water, the gap between cement and the salt layer can be greatly reduced, a light salt water channel can be effectively sealed, the cementing quality is good, the oil well cement paste at least enters an annular space between a salt layer top plate and a technical casing below the salt layer top plate and a well wall;
as a further improvement of the invention, the oil well cement in the oil well cement slurry is G-grade oil well cement, and the accelerator is calcium chloride or calcium formate; the G-level oil well cement can resist high temperature and high pressure and is suitable for severe working conditions;
as a further improvement of the invention, the oil well cement slurry ejected out each time in the second replacement operation and the third replacement operation accounts for 5 to 10 percent of the cement slurry in the annular space between the technical casing and the well wall after the first replacement operation; the proper amount of the cement paste of the oil well can be ejected out, so that the good pressure maintaining and coagulation promoting effects can be ensured;
in conclusion, the invention can greatly reduce the gap between cement and a salt layer, complete pressure maintaining and coagulation promoting, effectively seal and separate a light salt brine channel, has good cementing quality, prevents the salt layer top plate from permeating water, and ensures the brine outlet concentration and the production life of a well group.
Drawings
FIG. 1 is a schematic diagram of casing cementing operation in the horizontal well technology of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example one
The oil well cement slurry of the embodiment comprises 1 part of G-grade oil well cement, 1.2 parts of saturated saline water, 0.02 part of oil well cement expanding agent and 0.002 part of coagulant, wherein according to the size of an annulus between a technical casing and a well wall, the mass of 1 part of G-grade oil well cement is 10 tons, the mass of the corresponding 1.2 parts of saturated saline water is 12 tons, the mass of 0.02 part of oil well cement expanding agent is 200 kilograms, the mass of 0.002 part of coagulant is 20 kilograms, the oil well cement expanding agent adopts montmorillonite, the coagulant adopts calcium chloride, and the components are uniformly mixed.
Example two
The oil well cement slurry comprises 1 part of G-grade oil well cement, 1.1 part of saturated saline, 0.018 part of oil well cement expanding agent and 0.0025 part of coagulant, wherein according to the size of an annulus between a technical casing and a well wall, the mass of 1 part of G-grade oil well cement is 8 tons, the mass of the corresponding 1.1 part of saturated saline is 8.8 tons, the mass of 0.018 part of oil well cement expanding agent is 144 kilograms, the mass of 0.0025 part of coagulant is 20 kilograms, the oil well cement expanding agent adopts montmorillonite, and the coagulants adopt calcium formate and are uniformly mixed.
EXAMPLE III
The oil well cement slurry of the embodiment comprises 1 part of G-grade oil well cement, 1.35 parts of saturated saline water, 0.03 part of oil well cement expanding agent and 0.003 part of coagulant, wherein the mass of the 1 part of G-grade oil well cement is 20 tons according to the size of an annular space between a technical casing and a well wall, the mass of the corresponding 1.35 part of saturated saline water is 27 tons, the mass of the 0.03 part of oil well cement expanding agent is 600 kilograms, the mass of the 0.003 part of coagulant is 60 kilograms, the oil well cement expanding agent adopts montmorillonite, the coagulant adopts calcium formate, and the components are uniformly mixed.
As shown in fig. 1, the casing cementing process using any one of the three oil-well cement slurries in the horizontal well technology comprises the following steps: A) establishing a horizontal well 1, and putting a technical casing 4 into a borehole until reaching a horizontal section 2 of the horizontal well 1, wherein the horizontal section 2 is positioned below a salt layer top plate 3 in a stratum; b) Injecting the oil well cement slurry 6 into an annular space between the technical casing 4 and a well wall 5 through the technical casing 4 by a pump, and then carrying out primary pump injection displacement operation to ensure that the oil well cement slurry 6 enters the annular space between a salt layer top plate 3 and the technical casing 4 and between the technical casing 4 below the technical casing 4 and the well wall 5, and simultaneously the residual oil well cement slurry 7 in the technical casing 4 is about 3 cubic meters; performing secondary pump injection displacement operation before initial setting of the oil well cement paste, and ejecting a part of the residual oil well cement paste 7 in the technical casing 4, wherein the ejected oil well cement paste accounts for 5% of the oil well cement paste in the annular space between the technical casing 4 and the well wall 5 after the primary displacement operation, and the volume of the ejected oil well cement paste is about 1 cubic meter; performing pump injection displacement operation for the third time when the initial setting rheological property of the cement slurry is the worst, and ejecting a part of the residual oil well cement slurry 7 in the technical casing 4, wherein the ejected oil well cement slurry accounts for 5 percent of the oil well cement slurry in the oil ring between the technical casing 4 and the well wall 5 after the first displacement operation, the volume of the oil well cement slurry is about 1 cubic meter, and the cement slurry of about 1 cubic meter remains in the technical casing 4; C) and (5) after the oil well cement slurry outside the technical casing 4 is solidified, completing the lower part well cementation of the technical casing.
The oil well cement paste uses saturated salt water, when the cement paste is solidified, the precipitated salt water can not dilute and take away solid salt in a salt layer, the gap between the cement paste and the salt layer is prevented from being enlarged, the volume expansion rate of the cement paste is 10% by adding an expanding agent, the cement paste can be filled in the gap between the cement paste and the salt layer and a small gap inside the cement paste, the saturated salt water has a retarding effect, when a coagulant is added in three displacement operations, part of the oil well cement paste is ejected every time, pressure maintaining and coagulation accelerating can be completed for various gaps, the cement paste is prevented from being eroded by light salt water, the gap between a cement body and the salt layer can be greatly reduced, a light salt water channel can be effectively sealed, the well cementation quality is good, the oil well cement paste 6 enters the annular space between a salt layer top plate 3 and a technical casing 4 below the salt layer top plate 3 and a well wall 5, the water; the G-level oil well cement can resist high temperature and high pressure and is suitable for severe working conditions; the proper amount of the cement paste for ejecting the oil well is ejected each time in the second replacement operation and the third replacement operation, and meanwhile, a certain amount of cement paste is reserved in the technical casing 4, so that a good pressure maintaining and coagulation accelerating effect can be ensured.
Claims (5)
1. An oil well cement slurry comprising 1 part of oil well cement; it is characterized by also comprising: 1.1 to 1.35 portions of saturated saline, 0.018 to 0.03 portion of oil well cement expanding agent and 0.002 to 0.003 portion of coagulant are mixed evenly according to the mass ratio.
2. An oil well cement species as claimed in claim 1, wherein: the oil well cement is G-grade oil well cement; the coagulant is calcium chloride or calcium formate.
3. A casing cementing process using the oil-well cement slurry of claim 1 in horizontal well technology, comprising the steps of: A) establishing a horizontal well, and putting the technical casing into the borehole until reaching the horizontal section of the horizontal well, wherein the horizontal section is positioned below the salt layer top plate; it is characterized by also comprising: B) injecting the oil-well cement slurry of claim 1 into an annulus between the technical casing and the borehole wall through the technical casing, and then performing a first replacement operation so that the oil-well cement slurry enters the annulus between the salt layer top plate and the technical casing below the salt layer top plate and the borehole wall, and simultaneously, the remaining part of the oil-well cement slurry in the technical casing; performing second replacement operation when the thixotropy is enhanced before the initial setting of the cement paste, and ejecting a part of the residual oil well cement paste in the technical casing; performing third replacement operation when the initial setting thixotropy of the cement paste is the worst, and ejecting a part of the residual oil well cement paste in the technical casing and the residual part of the cement paste in the technical casing; C) and (5) after the oil well cement slurry outside the technical casing is solidified, completing the lower part well cementation of the technical casing.
4. The horizontal well technology casing cementing process according to claim 3, characterized in that: the oil well cement in the oil well cement slurry is G-grade oil well cement, and the coagulant is calcium chloride.
5. The horizontal well technology casing cementing process according to claim 3 or 4, characterized in that: the oil well cement slurry ejected out each time in the second replacement operation and the third replacement operation accounts for 5% -10% of the cement slurry in the annular space between the technical casing and the well wall after the first replacement operation.
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| CN202010473726.2A CN111763041B (en) | 2020-05-29 | 2020-05-29 | Oil well cement slurry and casing cementing process in horizontal well technology |
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| CN202010473726.2A CN111763041B (en) | 2020-05-29 | 2020-05-29 | Oil well cement slurry and casing cementing process in horizontal well technology |
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| CN111763041B CN111763041B (en) | 2021-11-12 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4500436A (en) * | 1980-10-17 | 1985-02-19 | Pabley Avtar S | Saltwater and hard water bentonite mud |
| RU2175711C1 (en) * | 2000-03-15 | 2001-11-10 | ООО "Астраханьгазпром" | Process of attachment of casing strings in well |
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2020
- 2020-05-29 CN CN202010473726.2A patent/CN111763041B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4500436A (en) * | 1980-10-17 | 1985-02-19 | Pabley Avtar S | Saltwater and hard water bentonite mud |
| RU2175711C1 (en) * | 2000-03-15 | 2001-11-10 | ООО "Астраханьгазпром" | Process of attachment of casing strings in well |
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| Title |
|---|
| 熊青山等: "《石油工程专业实习指导书-钻井》", 30 June 2011, 中国石油大学出版社 * |
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