CN116927687A - Method for reducing circulating temperature of well drilling fluid at bottom of well and drilling fluid system - Google Patents
Method for reducing circulating temperature of well drilling fluid at bottom of well and drilling fluid system Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 196
- 238000000034 method Methods 0.000 title claims abstract description 41
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- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000011161 development Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000003209 petroleum derivative Substances 0.000 abstract description 4
- 239000002343 natural gas well Substances 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 15
- 238000005755 formation reaction Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 238000005457 optimization Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
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- 238000005259 measurement Methods 0.000 description 2
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- LZLVZIFMYXDKCN-QJWFYWCHSA-N 1,2-di-O-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCC\C=C/C\C=C/C\C=C/C\C=C/CCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC LZLVZIFMYXDKCN-QJWFYWCHSA-N 0.000 description 1
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- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000005537 brownian motion Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to the field of drilling technology of petroleum and natural gas wells, and discloses a method for reducing circulation temperature of drilling fluid at a well bottom, wherein S1, the low-limit density rho of the drilling fluid meeting the stability of a well wall is determined min Drilling fluid high limit density rho meeting well control requirement max The method comprises the steps of carrying out a first treatment on the surface of the S2, determining a drilling fluid system according to the lithology of the stratum; s3, drilling fluid meeting the requirements of the steps S1 and S2 is subjected to density difference x g/cm 3 Dividing into a plurality of density gradients; s4, high limit density rho of secondary drilling fluid max Starting drilling and recording the circulating temperature of the drilling fluid at the bottom of the well; s5, judging whether the circulating temperature is within a specified range, if the circulating temperature is higher than the specified range, gradually reducing the high limit density rho of the drilling fluid according to the density gradient of the drilling fluid m The invention also discloses a drilling fluid system for reducing the circulating temperature of the drilling fluid at the bottom of the well until the circulating temperature of the drilling fluid at the bottom of the well reaches the specified range. The invention discloses a kind ofNovel methods for reducing the circulation temperature of a drilling fluid downhole.
Description
Technical Field
The invention relates to the field of drilling technology of petroleum and natural gas wells, in particular to a method for reducing circulating temperature of well drilling fluid at a well bottom and a drilling fluid system.
Background
With the continuous discovery of emerging energy sources and the increase in energy demand and the development of petroleum drilling technology, drilling of deep wells, ultra-deep wells, geothermal wells, dry wells, and natural gas hydrate wells has become an important aspect of the development of the drilling industry. The influence of the bottom hole circulation temperature on the downhole tool in the deep well and ultra-deep well drilling process is more and more obvious, and the high temperature causes frequent tool faults, so that the drilling time is restricted. The circulating temperature of the well drilling fluid at the bottom of a well is influenced by multiple conditions such as geothermal gradient, lithology characteristics, ground temperature, drilling parameters and the like, the phenomenon that the circulating temperature of the well drilling fluid at the bottom of a well exceeds 150 ℃ occurs in a Sichuan basin high stone ladder-mill stream block and a Luzhou deep shale gas block at present to different degrees, the high temperature of the well drilling fluid has serious negative effects on the drilling process, the high temperature of the well drilling fluid can cause high-temperature invalidation of a treating agent, the stability of the well drilling fluid such as rheological property moisture filtration property is influenced, serious negative effects are also generated on a well drilling tool and well logging equipment, the sealing performance of the well drilling tool is reduced by the high temperature, the service life of a drilling tool is shortened seriously by the high temperature, and the equipment while drilling is shortened by the high temperature, so that the production cost is increased. The main slurrying material of water-based drilling fluids is bentonite. Such as sodium bentonite, is used for tackifying, reducing the filtration loss and improving the lubricating performance. The effect of high temperature on the pulping material is mainly flocculation and dispersion. As the temperature increases, the severity of flocculation increases; meanwhile, the high temperature also enhances the capability of water molecules penetrating into the clay and the capability of cation diffusion and substitution on the clay surface, and promotes the dispersion of particles under the action of Brownian motion and external shearing force. The drill bit material tends to be easy to fatigue, strength is reduced and the like due to high temperature. The problems of inaccurate measurement and even deformation and damage of the equipment are shown when the logging-while-drilling equipment is at high temperature, so that the directional tool frequently loses signals, the well bottom azimuth and well deviation cannot be judged, the reservoir section is drilled and drilled for multiple times, the horizontal section is drilled and drilled for 21 times at most, the drilling construction period of an oil-gas well is severely restricted, and the manual operation strength and the operation cost are increased.
During drilling, the following measures are generally taken for cooling the drilling fluid. (1) Natural cooling can achieve the purpose of cooling the drilling fluid to a certain extent by prolonging the circulation route of the drilling fluid tank. This method is generally applicable where the drilling fluid displacement is not large and the returned drilling fluid temperature is not too high. The cooling mode is completely affected by the climatic conditions, has no obvious effect on deep wells, ultra-deep wells and high-temperature high-pressure wells, and cannot meet the requirement of safe drilling on the temperature of circulating drilling fluid for natural gas hydrate wells. (2) The low-temperature medium is mixed and cooled, low-temperature solid (such as ice cubes) or liquid is put into the drilling fluid pool, and the drilling fluid is cooled by a mixed heat conduction mode. This method is generally used for cooling water-based drilling fluids and is easy to obtain a low-temperature water source, and can only be used as an emergency scheme. (3) The cooling device is used for forced cooling, and when the temperature of the returning drilling fluid is too high, a drilling fluid cooling system is used for forced cooling. The working principle of the drilling fluid cooling system is mainly 3 modes of air cooling, spraying and interactive heat exchange. However, the external cooling device requires energy input and has huge energy loss.
Chinese patent CN108612495a discloses a drilling fluid cooling system, which comprises a movable pool, a delivery pump, an inlet and outlet manifold device and a cooling device, wherein the inlet and outlet manifold device comprises a drilling fluid inlet and outlet manifold device, a cold source inlet and outlet manifold device and a flushing manifold device, and specifically comprises a drilling fluid inlet pipe, a drilling fluid outlet pipe, a cold source inlet pipe and a cold source outlet pipe, a flushing drainage pipe and a flushing return pipe are arranged between the drilling fluid inlet pipe and the drilling fluid outlet pipe and between the cold source inlet pipe and the cold source outlet pipe, and a switch valve is arranged on each pipe; the cooling device is internally provided with a drilling fluid channel and a cold source channel. The inlet and outlet manifold device adopts a modularized structural design, realizes the functions of heat exchange by the same-directional and reverse-directional flow between the drilling fluid and the cold source, and the forward and reverse flushing functions of the drilling fluid channel, has the advantages of simple and convenient flushing functions, compact structure, convenient transportation and simple and efficient cleaning, and forms a box-type integrated skid-mounted structure between the cooling device and the inlet and outlet manifold device. However, this method requires a series of process equipment, is costly and requires additional heat exchange medium.
Chinese patent CN108276975a discloses a technology for improving the liquid property of drilling fluid by adding different high temperature stabilizers, and by adding high temperature stabilizers, the drilling fluid can endure 240 ℃ high temperature environment, but the method only considers the state of the drilling fluid in high temperature environment, and does not consider the high temperature resistant cost of drilling tools and while drilling equipment and the measurement deviation in high temperature, and still faces the problem of high cost drilling tools.
Disclosure of Invention
The invention provides a method for reducing the circulating temperature of well drilling fluid at the bottom of a well, which lays a foundation for reducing the circulating temperature and improving the economic and efficient development of petroleum and natural gas.
The invention is realized by the following technical scheme:
a method of reducing the circulating temperature of a drilling fluid downhole, comprising:
s1, determining low-limit density rho of drilling fluid meeting well wall stability min Drilling fluid high limit density rho meeting well control requirement max ；
S2, determining a drilling fluid system according to the lithology of the stratum;
s3, drilling fluid meeting the requirements of the steps S1 and S2 is subjected to density difference x g/cm 3 Dividing into a plurality of density gradients;
s4, after the drilling equipment is started, the drilling fluid is started to form the high limit density rho max Starting drilling and recording the circulating temperature of the drilling fluid at the bottom of the well;
s5, judging whether the circulating temperature is within a specified range, if the circulating temperature is higher than the specified range, gradually reducing the high limit density rho of the drilling fluid according to the density gradient of the drilling fluid m Until the circulating temperature of the well drilling fluid at the bottom of the well reaches the specified range or until the high limit density of the drilling fluid is reduced to the low limit density ρ of the drilling fluid min 。
As optimization, in step S1, the low limit density ρ of the drilling fluid for well wall stabilization is satisfied min And the method is particularly determined according to the lithology of the stratum and the drilling complexity of the adjacent well.
As an optimization of this process,in step S1, the high limit density ρ of the drilling fluid meeting the well control requirement is obtained max And judging according to the stratum pressure coefficient to be drilled and the development condition of the hydrocarbon reservoir.
As an optimization, in step S2, the drilling fluid system is determined based on formation lithology including, but not limited to: the shale stratum adopts oil-based drilling fluid, and the sandstone stratum adopts water-based drilling fluid.
As an optimization, in step S3, x is not greater than 0.1.
As optimization, the specific method in step S5 is as follows:
s5.1, judging whether the circulating temperature is in a specified range, if the circulating temperature of the drilling fluid at the bottom of the well is confirmed to be higher than the upper limit value of the specified range, jumping to S5.2, otherwise jumping to S5.4;
s5.2, inputting drilling fluid with one density gradient reduced through drilling equipment, acquiring the circulating temperature of the drilling fluid at the bottom of the well through a well bottom directional tool, judging, if the circulating temperature of the drilling fluid at the bottom of the well is higher than the upper limit value of a specified range, jumping to S5.3, otherwise jumping to S5.4;
s5.3, judging whether the density of the drilling fluid input at this time reaches the low limit density of the drilling fluid, if so, jumping to S5.4, otherwise, returning to S5.2;
s5.4, stopping reducing the density of the drilling fluid.
Preferably, the upper limit value of the prescribed range of the circulating temperature of the well drilling fluid at the bottom is not higher than 135 ℃.
As an optimization, the well drilling equipment adopts fine pressure control well drilling equipment.
Preferably, the downhole directional tool is a temperature sensor disposed downhole.
The invention also discloses a drilling fluid system for reducing the circulating temperature of the well drilling fluid at the bottom, which is used for the method for reducing the circulating temperature of the well drilling fluid at the bottom, wherein the density of the drilling fluid meets the requirements of well wall stability and well control, the drilling fluid is divided into a plurality of density gradients according to the specified density difference, and the circulating temperature of the drilling fluid at the bottom can be gradually reduced by injecting the drilling fluid with the density gradients from large to small.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to a method for reducing the circulating temperature of well drilling fluid at the bottom of a well and a drilling fluid system, wherein the drilling fluid system is determined by stratum lithology; determining the low-limit density of the drilling fluid meeting the stability of the well wall according to the lithology of the stratum and the drilling complex condition of the adjacent well; determining the high limit density of the drilling fluid meeting the well control requirement according to the formation pressure coefficient to be drilled and the development condition of the hydrocarbon reservoir; then the density of the drilling fluid is reduced in sequence, so that the effect of reducing the circulating temperature is achieved.
Detailed Description
The present invention will be described in further detail with reference to the following examples, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent, and the description thereof is merely illustrative of the present invention and not intended to be limiting.
During normal drilling, drilling fluid is injected into the wellbore from the wellhead of the drill string, heated by the formations below the wellbore, returned to the annulus, and returned from the wellhead of the annulus to heat the formations above the circumference of the wellbore while the annulus is flowing uphole. During the process of stopping drilling or tripping, the cooling-free drilling fluid is injected into the wellhead of the drill string, and heat in the stratum is continuously accumulated around the well bore, so that the drilling fluid and the stratum in the well bore are continuously heated, the temperature is gradually increased, and the well bore drilling fluid is assumed to be the whole unit body, namely, the stratum and the whole unit body of the well bore drilling fluid are subjected to heat exchange.
Heat transfer into the wellbore from the formation is expressed as:
the energy change of the drilling fluid in the shaft is expressed as:
by the energy balance principle, the drilling fluid heat balance equation per unit length in the shaft is expressed as:
in the above formula:
Q 1 is energy lambda m The heat conductivity coefficient of the drilling fluid;
λ f is the heat conductivity coefficient of the stratum; t (T) f Is the stratum temperature near the well wall; t (T) m Is the temperature of the drilling fluid; r is (r) w Is the radius of the borehole; r is (r) f Radius for stratigraphic unit grid; ρ m For the density of the drilling fluid, c m Specific heat for drilling fluid; delta z Is the formation unit thickness.
However, the medium and working condition contacted in the drilling process are complex, only single influencing factors are considered, so that on-site drilling operation cannot be effectively guided, and in the petroleum and natural gas drilling process, the circulating temperature of drilling fluid is mainly controlled by (1) the well bore condition, (2) the drilling tool condition and (3) the drilling fluid condition: drilling fluid system, drilling fluid density, viscosity, dynamic shear force, (4) specific heat capacity and heat conduction coefficient of the well bore medium, and the four conditions are affected.
When the formation temperature is constant, the drilling fluid temperature is positively correlated with the density, so the drilling fluid temperature can be changed by the parameters affecting the thermal equilibrium equation in the above formula, and the drilling fluid density is one of the changeable amounts. It is the main content of the invention to change the circulating temperature of the well drilling fluid at the bottom of the well by changing the density of the drilling fluid.
Examples
Accordingly, the present invention discloses a method of reducing the circulating temperature of a drilling fluid at the bottom of a well, comprising:
s1, determining low-limit density rho of drilling fluid meeting well wall stability min Drilling fluid high limit density rho meeting well control requirement max ；
S2, determining a drilling fluid system according to the lithology of the stratum;
s3, drilling fluid meeting the requirements of the steps S1 and S2 is subjected to density difference x g/cm 3 Dividing into a plurality of density gradients;
s4, after the drilling equipment is started, the drilling fluid is started to form the high limit density rho max Starting drilling and recording the circulating temperature of the drilling fluid at the bottom of the well;
s5, judging whether the circulating temperature is within a specified range, if the circulating temperature is higher than the specified range, gradually reducing the high limit density rho of the drilling fluid according to the density gradient of the drilling fluid m Until the circulating temperature of the well drilling fluid at the bottom of the well reaches the specified range or until the high limit density of the drilling fluid is reduced to the low limit density ρ of the drilling fluid min 。
In this embodiment, in step S1, the low-limit density ρ of the drilling fluid for stabilizing the well wall is satisfied min And the method is particularly determined according to the lithology of the stratum and the drilling complexity of the adjacent well.
In this embodiment, in step S1, the high limit density ρ of the drilling fluid meeting the well control requirement max And judging according to the stratum pressure coefficient to be drilled and the development condition of the hydrocarbon reservoir.
In this embodiment, in step S2, determining the drilling fluid system based on the formation lithology includes, but is not limited to: the shale stratum adopts oil-based drilling fluid, and the sandstone stratum adopts water-based drilling fluid.
In this embodiment, in step S3, x is not greater than 0.1.
In this embodiment, the specific method in step S5 is as follows:
s5.1, judging whether the circulating temperature is in a specified range, if the circulating temperature of the drilling fluid at the bottom of the well is confirmed to be higher than the upper limit value of the specified range, jumping to S5.2, otherwise jumping to S5.4;
s5.2, inputting drilling fluid with one density gradient reduced through drilling equipment, acquiring the circulating temperature of the drilling fluid at the bottom of the well through a well bottom directional tool, judging, if the circulating temperature of the drilling fluid at the bottom of the well is higher than the upper limit value of a specified range, jumping to S5.3, otherwise jumping to S5.4;
s5.3, judging whether the density of the drilling fluid input at this time reaches the low limit density of the drilling fluid, if so, jumping to S5.4, otherwise, returning to S5.2;
s5.4, stopping reducing the density of the drilling fluid.
In this embodiment, the upper limit value of the predetermined range of the circulating temperature of the downhole drilling fluid is not higher than 135 ℃.
In this embodiment, the drilling device adopts a fine pressure control drilling device.
In this embodiment, the downhole directional tool is a temperature sensor disposed downhole.
The invention also discloses a drilling fluid system for reducing the circulating temperature of the well drilling fluid at the bottom, which is used for the method for reducing the circulating temperature of the well drilling fluid at the bottom, wherein the density of the drilling fluid meets the requirements of well wall stability and well control, the drilling fluid is divided into a plurality of density gradients according to the specified density difference, and the circulating temperature of the drilling fluid at the bottom can be gradually reduced by injecting the drilling fluid with the density gradients from large to small.
The method for reducing the circulating temperature of the well drilling fluid at the bottom of a well by using the well drilling fluid system comprises the following specific implementation methods:
(1) According to stratum lithology and drilling complex conditions of adjacent wells, determining the low-limit density rho of drilling fluid meeting the stability of well walls min ；
(2) Determining the high limit density rho of the drilling fluid meeting the well control requirement according to the formation pressure coefficient to be drilled and the development condition of the hydrocarbon reservoir max ；
(3) Determining a drilling fluid system according to formation lithology: (1) the shale stratum adopts oil-based drilling fluid, and (2) the sandstone stratum adopts water-based drilling fluid;
(4) The low limit density of the drilling fluid meeting the well wall stability and the high limit density of the drilling fluid meeting the well control requirement are calculated according to 0.1g/cm 3 Is divided into a plurality of density gradients;
(5) After the drilling equipment is started, drilling is started from the drilling fluid with the high-limit density of the drilling fluid, and meanwhile, a well bottom directional tool records the well bottom circulating temperature; the drilling equipment is fine pressure control drilling equipment, the equipment is conventional equipment, a DAPC system of Schlumberger company, an MPD system of Halliburton company and an MFC system of Weatherford company can be adopted, and the details are omitted.
(6) If the detected circulating temperature of the well drilling fluid at the bottom of the well is higher (about 142 ℃), adopting fine pressure control drilling equipment to adjust the density of the drilling fluid by matching with a ground drilling fluid engineer, and sequentially reducing according to a gradient of 0.1g/cm < 3 >;
(7) Repeating the steps (5) - (6) to record the circulating temperature of the drilling fluid at the bottom of the well and sequentially reducing the density of the drilling fluid;
(8) And stopping reducing the density until the circulating temperature of the well drilling fluid at the bottom of the well is reduced to about 135 ℃ or the density of the drilling fluid is reduced to the low limit density of the drilling fluid meeting the well wall stability.
Although the present invention has been described above by way of the combination of the exemplary embodiments, it should be apparent to those skilled in the art that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined in the appended claims.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of reducing the circulating temperature of a drilling fluid downhole, comprising:
s1, determining low-limit density rho of drilling fluid meeting well wall stability min Drilling fluid high limit density rho meeting well control requirement max ；
S2, determining a drilling fluid system according to the lithology of the stratum;
s3, drilling fluid meeting the requirements of the steps S1 and S2 is subjected to density difference x g/cm 3 Dividing into a plurality of density gradients;
s4, after the drilling equipment is started, the drilling fluid is started to form the high limit density rho max Starting drilling and recording the circulating temperature of the drilling fluid at the bottom of the well;
s5, judging whether the circulating temperature is within a specified range, if the circulating temperature is higher than the specified range, gradually reducing the high limit density rho of the drilling fluid according to the density gradient of the drilling fluid m Until the circulating temperature of the well drilling fluid at the bottom of the well reaches the specified range or until the high limit density of the drilling fluid is reduced to the low limit density ρ of the drilling fluid min 。
2. The method according to claim 1, wherein in step S1, the low limit density ρ of the well-wall-stabilized drilling fluid is satisfied min And the method is particularly determined according to the lithology of the stratum and the drilling complexity of the adjacent well.
3. The method according to claim 1, wherein in step S1, the drilling fluid having a high limit density ρ meets the well control requirement max And judging according to the stratum pressure coefficient to be drilled and the development condition of the hydrocarbon reservoir.
4. A method of reducing the circulation temperature of a drilling fluid downhole according to claim 1, wherein in step S2, determining the drilling fluid system based on formation lithology includes, but is not limited to: the shale stratum adopts oil-based drilling fluid, and the sandstone stratum adopts water-based drilling fluid.
5. The method of claim 1, wherein x is not greater than 0.1 in step S3.
6. The method for reducing the circulating temperature of a drilling fluid at the bottom of a well according to claim 1, wherein the specific method in step S5 is as follows:
s5.1, judging whether the circulating temperature is in a specified range, if the circulating temperature of the drilling fluid at the bottom of the well is confirmed to be higher than the upper limit value of the specified range, jumping to S5.2, otherwise jumping to S5.4;
s5.2, inputting drilling fluid with one density gradient reduced through drilling equipment, acquiring the circulating temperature of the drilling fluid at the bottom of the well through a well bottom directional tool, judging, if the circulating temperature of the drilling fluid at the bottom of the well is higher than the upper limit value of a specified range, jumping to S5.3, otherwise jumping to S5.4;
s5.3, judging whether the density of the drilling fluid input at this time reaches the low limit density of the drilling fluid, if so, jumping to S5.4, otherwise, returning to S5.2;
s5.4, stopping reducing the density of the drilling fluid.
7. The method of reducing the circulating temperature of a downhole drilling fluid of claim 1, wherein the upper limit of the specified range of circulating temperatures of the downhole drilling fluid is not higher than 135 ℃.
8. A method of reducing the circulating temperature of a drilling fluid downhole according to claim 1, wherein the drilling apparatus employs a fine pressure control drilling apparatus.
9. The method of reducing the circulating temperature of a drilling fluid downhole of claim 6, wherein the downhole directional tool is a downhole temperature sensor.
10. A drilling fluid system for reducing the circulation temperature of a drilling fluid at the bottom of a well, which is used for the method for reducing the circulation temperature of the drilling fluid at the bottom of a well according to any one of claims 1 to 9, and is characterized in that the density of the drilling fluid meets the requirements of well wall stability and well control, the drilling fluid is divided into a plurality of density gradients according to a specified density difference, and the circulation temperature of the drilling fluid at the bottom of the well can be gradually reduced by injecting the drilling fluid with the density gradients from large to small.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372634.4A CN116927687A (en) | 2022-04-11 | 2022-04-11 | Method for reducing circulating temperature of well drilling fluid at bottom of well and drilling fluid system |
Applications Claiming Priority (1)
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| CN202210372634.4A CN116927687A (en) | 2022-04-11 | 2022-04-11 | Method for reducing circulating temperature of well drilling fluid at bottom of well and drilling fluid system |
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