GB2617631A - Method and system for managed pressure well cementing based on deep wellbore cement slurry system simulation - Google Patents
Method and system for managed pressure well cementing based on deep wellbore cement slurry system simulation Download PDFInfo
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- GB2617631A GB2617631A GB2209895.8A GB202209895A GB2617631A GB 2617631 A GB2617631 A GB 2617631A GB 202209895 A GB202209895 A GB 202209895A GB 2617631 A GB2617631 A GB 2617631A
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- 239000004568 cement Substances 0.000 title claims abstract description 85
- 239000002002 slurry Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000004088 simulation Methods 0.000 title claims abstract description 41
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 52
- 230000008569 process Effects 0.000 claims abstract description 31
- 239000011148 porous material Substances 0.000 claims abstract description 23
- 238000006703 hydration reaction Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000009897 systematic effect Effects 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 27
- 238000011010 flushing procedure Methods 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 11
- 230000036571 hydration Effects 0.000 claims description 11
- 238000007711 solidification Methods 0.000 claims description 10
- 230000008023 solidification Effects 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 3
- 230000005465 channeling Effects 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 3
- FPIPGXGPPPQFEQ-OVSJKPMPSA-N all-trans-retinol Chemical compound OC\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-OVSJKPMPSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000011717 all-trans-retinol Substances 0.000 description 1
- 235000019169 all-trans-retinol Nutrition 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009918 complex formation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 230000005284 excitation Effects 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/20—Computer models or simulations, e.g. for reservoirs under production, drill bits
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
A method and system for managed pressure well cementing based on deep wellbore cement slurry system simulation. The method comprises the following steps: simulating a hydration reaction of wellbore cement slurry on the basis of basic data and well cementing data of an operating well; calculating in real time the bottom hole pressure in a well cementing process on the basis of the simulation; and adjusting the amount of opening of a choke manifold in order to control wellhead back pressure, such that formation pore pressure < bottom hole pressure < formation fracture pressure. The system comprises a computer-readable medium having a preset program stored thereon, the above method being able to be implemented when the preset program is executed. Bottom hole pressure can be calculated in real time by means of simulating physical or chemical reaction processes of a cement slurry system in a well cementing process, and wellhead pressure is controlled by means of adjusting a choke manifold, such that the bottom hole pressure is constantly maintained in the safe operation window range for a formation, thus preventing the occurrence of complex accidents such as well kicks, gas channeling, or leakage.
Description
METHOD AND SYSTEM FOR MANAGED PRESSURE WELL CEMENTING BASED ON DEEP WELLBORE CEMENT SLURRY SYSTEM SIMULATION
This patent application claims the benefit and priority of Chinese Patent Application No. 202011292610.5, entitled "MANAGED PRESSURE CEMENTING METHOD AND SYSTEM BASED ON SYSTEMATIC SIMULATION OF DEEP WELLBORE CEMENT SLURRY" filed on November 18, 2020, the disclosure of which is incorporated by reference herein in its entirety as part of the present application.
TECHNICAL FIELD
The present invention relates to the technical field of oil and gas well development, and particularly relates to a managed pressure cementing method and system based on systematic simulation of deep wellbore cement slurry. Cr)
00 BACKGROUND ART
With the continuous depletion of world energy sources, newly discovered oil and gas 0:3) reservoirs in the world are found to be in deep layers and deep water. These deep-layer and C\I deep-water reservoirs are rich in oil and gas resources, but are also accompanied with increasingly complex geological conditions. In a cementing process of deep oil and gas wells, problems such as narrow safe density windows in complex oil and gas reservoirs can lead to frequent well kick, lost circulation and gas channeling during the cementing process, which seriously threatens the integrity of a wellbore.
The traditional cementing technology usually uses high-density cement slurry to balance the formation pressure to prevent gas channeling. However, under the condition of narrow safe density windows, excessively heavy cement slurry is easy to fracture the formation and induce leakage accidents. During the cementing process, there are complex physical and chemical reactions in a cement slurry system in the wellbore, and the phenomena of hydration and pressure loss of the cement slurry will also induce cementing gas channeling accidents. In addition, the cementing process is complex, including a variety of working conditions such as circulating well flushing, casing running, cement injection and waiting for cement solidification. This leads to the change of wellbore pressure during the cementing process, which is more likely to induce accidents such as well kick, lost circulation and gas channeling. Therefore, the traditional cementing technology is difficult to meet the requirements for safe and efficient cementing under deep and complex formation conditions.
SUNI MARY
Based on this, an objective of the present invention is to provide a managed pressure cementing method and system based on systematic simulation of deep wellbore cement slurry.
A bottom hole pressure can be calculated in real time by simulating a physical or chemical reaction process of a cement slurry system during a cementing process. A wellhead back pressure can be controlled by adjusting a choke manifold. In this way, the bottom hole pressure is always maintained within the range of a safe operation window of the formation, thereby preventing complex accidents such as well kick, gas channeling and lost circulation, and making up for the defects of the traditional cementing technology.
In order to achieve the above objective, the present invention provides the following solutions: A managed pressure cementing method based on systematic simulation of deep wellbore cement slurry includes the following steps: simulating a reaction of wellbore cement slurry according to basic data and cementing data of an operating well, calculating a bottom hole pressure during a cementing process in real time according to the simulation, and adjusting an opening of a choke manifold to control a wellhead pressure, so that a formation pore pressure < the bottom hole pressure < a formation fracture pressure.
As a further optimization of the present invention, the method may further include the following steps: if a well flushing operation is performed, simulating a dynamic flow process of a well flushing fluid, and calculating the bottom hole pressure 2 f phvz P = Pa + Pgh dw-cit, where ph represents the bottom hole pressure, pa represents a wellhead back pressure, p represents a wellbore fluid density, h represents a wellbore length, .f represents an annular friction coefficient, v represents an annular drilling fluid flow rate, du, represents a borehole diameter, and c1,-0 represents an outer diameter of a casing.
As a further optimization of the present invention, the method may further include the following steps: if a casing running operation is performed, simulating wellbore pressure distribution during a casing running process, and calculating an equivalent flow rate i fry rr dt, during the casing running process, where v represents an annular equivalent flow rate, vc represents a casing running velocity, and Klc represents an adhesion coefficient of a drilling fluid.
As a further optimization of the present invention, the method may further include the following steps: if a cement injection operation is performed, simulating a flow process of a slurry column liquid level in a wellbore, and calculating the bottom hole pressure 2f i kEv2 Ph pc + (p,ghi + where n represents a type of an injected fluid.
As a further optimization of the present invention, the method may further include the following steps: if an operation of waiting for cement solidification is performed, simulating a cement slurry solidification process in the wellbore according to cement slurry S alt? pgh * , data and calculating the bottom hole pressure b a asoo * where hi represents a length of the ith cement slurry, w represents a degree of hydration of the th cement slurry, and woo represents a degree of hydration of the cement slurry when the strength of the cement slurry reaches the preset strength.
As a further optimization of the present invention, the method may further include the following step: if the bottom hole pressure is still lower than the formation pore pressure when the choke manifold is opened to a preset minimum opening, turning on a back pressure pump to increase the wellhead pressure, so that the bottom hole pressure is greater than the formation pore pressure.
The present invention further provides a managed pressure cementing system based on systematic simulation of deep wellbore cement slurry, including a choke manifold, a back pressure pump connected with the choke manifold, a processor electrically connected with the choke manifold and the back pressure pump respectively, and a computer readable medium connected with the processor. A preset program is stored in the computer readable medium, and when the preset program is executed by the processor, any one of the above managed pressure cementing methods based on systematic simulation of deep wellbore cement slurry can be implemented.
According to the specific embodiments provided by the present invention, the present invention provides the following technical effects: In the managed pressure cementing method based on systematic simulation of deep wellbore cement slurry in the present invention, the bottom hole pressure can be calculated in real time by simulating a physical or chemical reaction process of a cement slurry system during a cementing process, and the wellhead back pressure can be controlled by adjusting the choke manifold, so that the bottom hole pressure is always maintained within the range of a safe operation window of the formation, thereby preventing complex accidents such as well kick, gas channeling and lost circulation, and making up for the defects of the traditional cementing technology.
In the managed pressure cementing system based on systematic simulation of deep wellbore cement slurry in the present invention, the choke manifold and the back pressure pump can be automatically controlled according to simulation and real-time calculation, thereby effectively ensuring the safety and reliability of the cementing process, preventing complex accidents such as well kick, gas channeling and lost circulation, and making up for the defects of the traditional cementing technology.
BRIEF DESCRIPTION OF THE DRAWINGS
To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the accompanying drawings required for the embodiments are briefly described below. The accompanying drawings in the following descriptions show merely some embodiments of the present invention, and those of ordinary skill in the art may still derive other accompanying drawings from these accompanying drawings without creative efforts.
FIG. 1 is a schematic diagram of a well flushing operation of a managed pressure cementing system based on systematic simulation of deep wellbore cement slurry of the present invention.
FIG. 2 is a schematic diagram of a casing running operation of the managed pressure cementing system based on systematic simulation of deep wellbore cement slurry of the present invention.
FIG. 3 is a schematic diagram of a cement injection operation of the managed pressure cementing system based on systematic simulation of deep wellbore cement slurry of the present invention.
FIG. 4 is a schematic diagram of an operation of waiting for cement solidification of the managed pressure cementing system based on systematic simulation of deep wellbore cement slurry of the present invention.
Reference numerals: 1. drilling rig 2. rotary control head; 3. blowout preventer; 4. wellbore; 5. drilling fluid pump; 6. drilling fluid tank; 7. cement slurry pump; 8. cement tank; 9. back pressure pump; 10. choke manifold; 11. processor; 12. flow meter; 13. gas-liquid separation tank; 14. mud pit; 15. drill pipe; 16. drill bit; 17. casing; 18. casing head; 19. cement slurry; 20. computer readable medium.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The technical solutions in the embodiments of the present invention will be described below clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are merely some rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
An objective of the present invention is to provide a managed pressure cementing method and system based on systematic simulation of deep wellbore cement slurry. The bottom hole pressure is always maintained within the range of a safe operation window of the formation, thereby preventing complex accidents such as well kick, gas channeling and lost circulation, and making up for the defects of the traditional cementing technology.
To make the above-mentioned objective, features, and advantages of the present invention clearer and more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a well flushing operation of a managed pressure cementing system based on systematic simulation of deep wellbore cement slurry of the present invention. FIG. 2 is a schematic diagram of a casing running operation of the managed pressure cementing system based on systematic simulation of deep wellbore cement slurry of the present invention. As shown in FIG. 1 to FIG. 2, the present invention provides a managed pressure cementing method based on systematic simulation of deep wellbore cement slurry, including the following steps: a reaction of wellbore cement slurry is simulated according to basic data and cementing data of an operating well, the bottom hole pressure during a cementing process is calculated in real time according to the simulation, and an opening of a choke manifold is adjusted to control a wellhead pressure, so that a formation pore pressure < the bottom hole pressure < a formation fracture pressure, that is, the bottom hole pressure is greater than the formation pore pressure and lower than the formation fracture pressure.
The process of adjusting the opening of the choke manifold to control the wellhead pressure specifically includes: according to the bottom hole pressure obtained by the simulation, the opening of the choke manifold is adjusted to control an actual wellhead pressure, so that the actual wellhead pressure is lower than the formation fracture pressure and greater than the formation pore pressure.
In the managed pressure cementing method based on systematic simulation of deep wellbore cement slurry of the present invention, the bottom hole pressure can be calculated in real time by simulating a physical or chemical reaction process of a cement slurry system during a cementing process, and the wellhead back pressure can be controlled by adjusting the choke manifold, so that the bottom hole pressure is always maintained within the range of a safe operation window of the formation, thereby preventing complex accidents such as well kick, gas channeling and lost circulation, and making up for the defects of the traditional cementing technology.
A wellbore 4 is a borehole drilled into the formation. A blowout preventer 3 is mounted on a top of the wellbore 4 and is configured to close the wellbore 4 at any time when complex accidents such as well kick and lost circulation occur. A rotary control head 2 is mounted at an upper part of the blowout preventer 3 and is configured to control the closure of an annular space between a drill pipe 15/a casing 17 and the wellbore 4, and guide a wellbore fluid to flow into a choke manifold 10 from lateral branches. A drill rig 1 is mounted at an upper part of the center of the wellbore and is configured to provide an operating platform for drilling/cementing workers.
The managed pressure cementing method based on systematic simulation of deep wellbore cement slurry in this embodiment specifically includes the following steps: a current operating state is judged.
Sl: If a well flushing operation is performed, a dynamic flow process of a well flushing fluid in the wellbore is simulated, and a bottom hole pressure is determined by the following formula: nceih 2riphy.4 CO where ph represents the bottom hole pressure, Pa; pa represents a wellhead back pressure, Pa; p represents a wellbore fluid density, kg/m3; h represents a wellbore length, m; f represents an annular module coefficient; v represents an annular drilling fluid flow rate, m/s; dw represents a borehole diameter, m; and dc, represents an outer diameter of a casing, m.
The bottom hole pressure is calculated by Formula (1), and the bottom hole pressure is compared with the formation pore pressure and the formation fracture pressure. If the bottom hole pressure is lower than the formation pore pressure, the opening of the choke manifold is reduced to increase the wellhead back pressure, and the increment is: Ap=pp-pb (2). to
If the bottom hole pressure is greater than the formation fracture pressure, the opening of the choke manifold is increased to reduce the wellhead back pressure, and the decrement is: Ap=pb-pt (3), where pp represents a formation pore pressure, and pj represents a formation fracture pressure.
S2: If a casing running operation is performed, wellbore surge pressure distribution under the action of casing running is simulated. An equivalent flow rate during casing running is calculated first: IX of2-1 = K.)17, (4) where 1' represents an annular equivalent flow rate, m/s; vc represents a casing running velocity, m/s; and IC, represents an adhesion coefficient of a drilling fluid, dimensionless.
Then, in combination with Formula (1), the bottom hole pressure during the casing running process is obtained in real time according to the annular equivalent flow rate. The comparison of the bottom hole pressure with the formation pore pressure and the formation fracture pressure in Si is repeated. The corresponding operations are performed. That is, if the bottom hole pressure is lower than the formation pore pressure, the opening of the choke manifold is reduced to increase the wellhead back pressure; and if the bottom hole pressure is greater than the formation fracture pressure, the opening of the choke manifold is increased to reduce the wellhead back pressure, so that the wellhead pressure is lower than the formation fracture pressure and greater than the formation pore pressure.
S3: If a cement injection operation is performed, the dynamic flow processes of various fluids in the well are simulated, and the spatial and temporal distribution of various types of fluids such as cement slurry, spacer fluid and flushing fluid are considered in the simulation. The real-time bottom hole pressure is calculated by the following formula: 2;Alin? pb = pc, ± (p,gh,+ f) (5) 1-1 4-dee where n represents a type of an injected fluid.
Then, the comparison of the bottom hole pressure with the formation pore pressure and the formation fracture pressure in Si is repeated, and the corresponding operations are performed, so that the wellhead pressure is lower than the formation fracture pressure and greater than the formation pore pressure.
S4: If an operation of waiting for cement solidification is performed, the hydration and solidification processes of the cement slurry in the wellbore need to be simulated, and the phenomena of hydration and pressure loss of the cement slurry need to be considered. The real-time bottom hole pressure is determined by the following formula: 956k tx, D an (6) - dw-dec, asm where hi represents a length of the ith cement slurry, m; a, represents a degree of hydration of the ith cement slurry; and 0500 represents a degree of hydration of the cement slurry when the strength of the cement slurry reaches the set strength. In this embodiment, woo represents a degree of hydration of the cement slurry when the set strength is 239 Pa.
Then, the comparison of the bottom hole pressure with the formation pore pressure and the formation fracture pressure in Si is repeated, and the corresponding operations are performed.
As a result, the bottom hole pressure in the entire cementing process is completely simulated in real time, and the wellhead back pressure is controlled by controlling the choke manifold and the back pressure pump, so that the bottom hole pressure is effectively controlled within a safe range, thereby preventing complex accidents such as well kick, gas channeling and lost circulation during the cementing process. Furthermore, the simulated bottom hole pressure can be compared with the tested pressure in real time, thereby effectively judging the bottom hole situation and further ensuring the safety of construction.
It should be noted that in this embodiment, the basic data of the operating well includes a borehole track, a wellbore structure, a formation pressure profiles, slurry column fluid parameters, a formation temperature gradient, etc. In addition, as shown in FIG. 1 to FIG. 4, the present invention further provides a managed pressure cementing system based on systematic simulation of deep wellbore cement slurry, including a choke manifold 10, a back pressure pump 9 connected with the choke manifold 10, a processor 11 electrically connected with the choke manifold 10 and the back pressure pump 9 respectively, and a computer readable medium 20 connected with the processor 11. A preset program is stored in the computer readable medium 20, and when the preset program is executed by the processor, the above-mentioned managed pressure cementing method based on systematic simulation of deep wellbore cement slurry can be implemented.
FIG. 1 to FIG. 4 show the operating situations of four stages of well flushing, casing running, cement injection and waiting for cement solidification in this embodiment.
As shown in FIG. 1, in the well flushing operation, a well flushing fluid is injected by a drilling fluid pump 5 to flush rock debris in the borehole. At this time, according to the simulation in the computer readable medium 20, the processor 11 adjusts the opening of the choke manifold 10 according to the bottom hole pressure calculated by Formula (1) and the comparison results of the bottom hole pressure with the formation pore pressure and the formation fracture pressure, thereby controlling the wellhead back pressure.
As shown in FIG. 2, in the casing running operation, the casing is slowly installed in the borehole, which will cause excitation pressure. According to the wellbore pressure distribution simulated in the computer readable medium 20, the processor 11 calculates the equivalent flow rate according to Formula (4) and calculates the bottom hole pressure according to the equivalent flow rate, and adjusts the opening of the choke manifold 10 or the back pressure pump 9 according to the comparison results of the calculated bottom hole pressure with the formation pore pressure and the formation fracture pressure, thereby adjusting the wellhead back pressure.
As shown in FIG. 3, in the cement injection operation, the cement slurry, spacer fluid and flushing fluid are required for configuration of cementing, and are injected into the wellbore through a cement slurry pump 7. According to the simulation in the computer readable medium 20, the processor 11 calculates the bottom hole pressure according to Formula (5), and adjusts the opening of the choke manifold 10 according to the comparison results of the calculated bottom hole pressure with the formation pore pressure and the formation fracture pressure, thereby adjusting the wellhead back pressure.
As shown in FIG. 4, in the operation of waiting for cement solidification, when a cement slurry column is injected into the set position, the cement slurry pump 7 stops.
According to the simulation in the computer readable medium 20, the processor 11 calculates the bottom hole pressure according to Formula (5) by considering the hydration of the cement slurry, and adjusts the opening of the choke manifold 10 or the back pressure pump 9 according to the comparison results of the calculated bottom hole pressure with the formation pore pressure and the formation fracture pressure, thereby adjusting the wellhead back pressure.
Each embodiment of the present invention is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments may refer to each other.
In this specification, some specific embodiments are used for illustration of the principles and implementations of the present invention. The description of the foregoing embodiments is used to help illustrate the method of the present invention and the core ideas thereof In addition, persons of ordinary skill in the art can make various modifications in terms of specific implementations and the scope of application in accordance with the ideas of the present invention. In conclusion, the content of the present description shall not be construed as limitations to the present invention.
Claims (7)
- CLAIMSI. A managed pressure cementing method based on systematic simulation of deep wellbore cement slurry, comprising the following steps: simulating a reaction of wellbore cement slurry according to basic data and cementing data of an operating well, calculating a bottom hole pressure during a cementing process in real time according to the simulation, and adjusting an opening of a choke manifold to control a wellhead pressure, so that a formation pore pressure < the bottom hole pressure < a formation fracture pressure.
- 2. The managed pressure cementing method based on systematic simulation of deep wellbore cement slurry according to claim 1, further comprising the following steps: if a well flushing operation is performed, simulating a dynamic flow process of a well flushing fluid, 2f pht.t2 Pt, p pg + , and calculating the bottom hole pressure 4211, rei wherein pa represents the bottom hole pressure, pa represents a wellhead back pressure, p represents a wellbore fluid density, h represents a wellbore length, f represents an annular friction coefficient, V represents an annular drilling fluid flow rate, dt, represents a borehole diameter, and cico represents an outer diameter of a casing.
- 3. The managed pressure cementing method based on systematic simulation of deep wellbore cement slurry according to claim 2, further comprising the following steps: if a casing running operation is performed, simulating wellbore pressure distribution during a V = K)17 t t casing running process, and calculating an equivalent flow rate during the casing running process, wherein 71 represents an annular equivalent flow rate, vc represents a casing running velocity, and IC represents an adhesion coefficient of a drilling fluid.
- 4. The managed pressure cementing method based on systematic simulation of deep wellbore cement slurry according to claim 3, further comprising the following steps: if a cement injection operation is performed, simulating a flow process of a slurry column liquid 30 level in a wellbore, and calculating the bottom hole pressure Ph P 2f Alto) (p, qh, + dw-41,0 wherein it represents a type of an injected fluid.
- 5. The managed pressure cementing method based on systematic simulation of deep wellbore cement slurry according to claim 4, further comprising the following steps: if an operation of waiting for cement solidification is performed, simulating a cement slurry* solidification process in the wellbore according to cement slurry data, and calculating the n 956h; a i = Pa + pgh E, bottom hole pressure ancde 1.50g) wherein lb represents a length of the ith cement slurry, a, represents a degree of hydration of the ith cement slurry, and a500 represents a degree of hydration of the cement slurry when the strength of the cement slurry reaches the preset strength.
- 6. The managed pressure cementing method based on systematic simulation of deep wellbore cement slurry according to any one of claims 1-5, further comprising the following step: if the bottom hole pressure is still lower than the formation pore pressure when the choke manifold is opened to a preset minimum opening, turning on a back pressure pump to increase the wellhead pressure, so that the bottom hole pressure is greater than the formation pore pressure.
- 7. A managed pressure cementing system based on systematic simulation of deep wellbore cement slurry, comprising a choke manifold, a back pressure pump connected with the choke manifold, a processor electrically connected with the choke manifold and the back pressure pump respectively, and a computer readable medium connected with the processor, wherein a preset program is stored in the computer readable medium, and when the preset program is executed by the processor, the managed pressure cementing method based on systematic simulation of deep wellbore cement slurry according to any one of claims 1-6 is implemented.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011292610.5A CN112417778A (en) | 2020-11-18 | 2020-11-18 | Pressure control well cementation method and system based on deep shaft cement slurry system simulation |
| PCT/CN2022/072468 WO2022105945A1 (en) | 2020-11-18 | 2022-01-18 | Method and system for managed pressure well cementing based on deep wellbore cement slurry system simulation |
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| GB202209895D0 GB202209895D0 (en) | 2022-08-17 |
| GB2617631A true GB2617631A (en) | 2023-10-18 |
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| CN112417778A (en) * | 2020-11-18 | 2021-02-26 | 中国石油大学(华东) | Pressure control well cementation method and system based on deep shaft cement slurry system simulation |
| CN113006769B (en) * | 2021-03-17 | 2022-07-26 | 中国石油大学(华东) | Intelligent well killing method and device for complex pressure system stratum |
| CN113216940B (en) * | 2021-04-27 | 2022-04-15 | 中国平煤神马能源化工集团有限责任公司 | Multi-point rock stratum pore pressure testing method and system |
| CN116163673B (en) * | 2023-04-25 | 2023-07-04 | 中国石油大学(华东) | Micro-pressure control device and method for deep water shallow gradient well cementation circulating wellhead |
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| CN112417778A (en) * | 2020-11-18 | 2021-02-26 | 中国石油大学(华东) | Pressure control well cementation method and system based on deep shaft cement slurry system simulation |
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- 2020-11-18 CN CN202011292610.5A patent/CN112417778A/en active Pending
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- 2022-01-18 WO PCT/CN2022/072468 patent/WO2022105945A1/en active Application Filing
- 2022-01-18 GB GB2209895.8A patent/GB2617631A/en active Pending
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| GB202209895D0 (en) | 2022-08-17 |
| WO2022105945A1 (en) | 2022-05-27 |
| CN112417778A (en) | 2021-02-26 |
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