CN114251055A - Drill rod and drilling fluid temperature control system - Google Patents
Drill rod and drilling fluid temperature control system Download PDFInfo
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- CN114251055A CN114251055A CN202011012288.6A CN202011012288A CN114251055A CN 114251055 A CN114251055 A CN 114251055A CN 202011012288 A CN202011012288 A CN 202011012288A CN 114251055 A CN114251055 A CN 114251055A
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- 238000005553 drilling Methods 0.000 title claims abstract description 156
- 239000012530 fluid Substances 0.000 title claims abstract description 127
- 238000009413 insulation Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 31
- 239000000110 cooling liquid Substances 0.000 claims abstract description 12
- 238000012546 transfer Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000002826 coolant Substances 0.000 description 6
- 239000004576 sand Substances 0.000 description 5
- 239000012774 insulation material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
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- 238000001556 precipitation Methods 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
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- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- 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
- 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
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- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a drill rod and a drilling fluid temperature control system, wherein the drill rod is used for exploiting an oil-gas well and comprises a plurality of rod sections which are sequentially connected, wherein the rod sections comprise: the cooling device comprises a first pipe body and a second pipe body, wherein the first pipe body is sleeved outside the second pipe body, and a cooling channel is arranged on the inner side of the second pipe body and used for transferring cooling liquid; the heat insulation assembly is arranged between the first pipe body and the second pipe body to isolate heat transfer between the first pipe body and the second pipe body, a heat insulation groove is formed in the inner side of the first pipe body and/or the outer side of the second pipe body, the heat insulation assembly is arranged in the heat insulation groove, the first pipe body is provided with a first end and a second end, and a positioning step is arranged in the first end of the first pipe body. The drill rod and the drilling fluid temperature control system solve the problems of drilling fluid performance reduction and unstable and sensitivity reduction of underground instruments caused by high temperature under an oil and gas well in the prior art.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to a drill rod and a drilling fluid temperature control system.
Background
The drilling fluid is a circulating fluid for drilling, is blood for drilling and plays a very important role in the drilling process. The circulation process of the drilling fluid is as follows: the mud pump pumps the prepared drilling fluid into a well from a mud tank, the drilling fluid flows to the bottom of the well to cool a drill bit at the bottom of the well, and the drilling fluid flows out of the drill bit after being cooled, and the drilling fluid mainly has the following functions: (1) the well bottom is cleaned, the rock debris is carried, the repeated cutting of a drill bit is avoided, the abrasion is reduced, and the efficiency is improved; (2) the method has the advantages that downhole tools such as the drill bit and the like are cooled and lubricated, the downhole circulating temperature is reduced, the abrasion of the drilling tool is reduced, and the service life of the drilling tool is prolonged; (3) the rock lateral pressure of the well wall is balanced, a filter cake is formed on the well wall, and the well wall is closed and stabilized.
The existing downhole power drilling tool can generally bear 200 ℃ and the drilling fluid can generally bear 260 ℃, so that the drilling tool needs to be cooled during drilling.
However, with the development of oil and gas resources and special resources, drilling engineering work is developing towards ultra-deep wells, special wells (for example, the bottom temperature of a myriameter deep well reaches more than 260 ℃), geothermal wells (hot dry rock has development value more than 350 ℃), and the like.
Disclosure of Invention
The invention mainly aims to provide a drill rod and a drilling fluid temperature control system to solve the problems of drilling fluid performance reduction caused by high temperature under an oil and gas well and unstable underground instruments and sensitivity reduction in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a drill pipe for producing an oil and gas well, the drill pipe comprising a plurality of rod sections connected in series, wherein the rod section comprises: the cooling device comprises a first pipe body and a second pipe body, wherein the first pipe body is sleeved outside the second pipe body, and a cooling channel is arranged on the inner side of the second pipe body and used for transferring cooling liquid; the heat insulation assembly is arranged between the first pipe body and the second pipe body so as to isolate heat transfer between the first pipe body and the second pipe body.
Further, the inside of first body and/or the outside of second body are equipped with the heat-insulating groove, and thermal-insulated subassembly sets up in the heat-insulating groove.
Further, the first pipe body is provided with a first end and a second end, and a positioning step is arranged in the first end of the first pipe body, so that when the second pipe body is inserted into the first pipe body from the second end, the positioning step stops the second pipe body in the first pipe body.
Further, the pole segment further comprises: the positioning assembly is arranged on the inner side of the second end of the first pipe body, so that the second pipe body is positioned in the first pipe body when the second pipe body is inserted into the first pipe body.
Further, the pole segment further comprises: a male connector disposed at the first end; the female joint is arranged at the second end; wherein, male joint is used for being connected with the female joint of adjacent pole section, and female joint is used for being connected with the male joint of adjacent pole section, and male joint, female joint and first body integrated into one piece set up.
According to another aspect of the present invention there is provided a drilling fluid temperature control system comprising a drill pipe disposed in a wellbore for drilling a well, a reservoir containing drilling fluid, and a drive assembly for delivering drilling fluid into the drill pipe to cool the drill pipe and deliver cooled drilling fluid into the reservoir, the drill pipe being as claimed in any one of claims 1 to 5.
Further, the drilling fluid temperature control system further comprises: the cooler, the one end and the pit shaft of cooler are connected, and the other end and the liquid storage pot of cooler are connected, and wherein, drive assembly carries the coolant liquid to the cooler in from the pit shaft to carry the coolant liquid to the liquid storage pot after the cooler cools off the liquid storage pot.
Further, the drilling fluid temperature control system further comprises: the filter assembly is connected with the shaft to filter the drilling fluid in the shaft; wherein the filter assembly is further connected with the cooler so that the drilling fluid is conveyed to the cooler after being filtered.
Further, the cooler has an inlet end and an outlet end, and the drilling fluid enters the cooler from the inlet end to be discharged from the outlet end after cooling, and temperature control system still includes: a first temperature sensor disposed at the outlet end for measuring the temperature of the cooling liquid flowing out of the outlet end of the cooler; and the flow sensor is arranged at the inlet end and used for detecting the flow of the drilling fluid flowing into the cooler.
Further, the drilling fluid temperature control system further comprises: a second temperature sensor disposed at the inlet end for measuring the temperature of the drilling fluid as it enters the cooler; and the controller is connected with the cooler, the first temperature sensor, the second temperature sensor and the flow sensor, so that the cooler is controlled to cool the cooling liquid according to the received detection information of the first temperature sensor, the second temperature sensor and the flow sensor.
The drill rod applying the technical scheme of the invention is mainly applied to drilling oil and gas wells in the exploitation of oil fields, the drill rod comprises a drill bit and a plurality of rod sections, the number of the rod sections is selected according to the drilling depth, and then the rod sections are spliced end to form a rod body of the drill rod, a rod section main body of the drill rod comprises three parts, a first pipe body, a heat insulation assembly and a second pipe body from outside to inside in sequence, the heat insulation assembly is arranged in a heat insulation cavity between the first pipe body and the second pipe body, the heat insulation assembly adopts heat insulation materials to reduce the heat transfer of the first pipe body to the second pipe body, thereby ensuring that the temperature of the drilling fluid in the cooling channel at the inner side of the second pipe body is not raised too fast due to the overhigh temperature of the external environment to influence the performance of the drilling fluid and the cooling effect on the drill bit, therefore, the drilling fluid can cool the drill bit as much as possible, and the problem that the drill bit is easy to damage when used in a high-temperature environment is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a structural cross-sectional view of an embodiment of a drill rod according to the present invention; and
fig. 2 shows a schematic diagram of an embodiment of the temperature control system of the present invention.
Wherein the figures include the following reference numerals:
10. a pole section; 11. a first pipe body; 111. positioning a step; 12. a second tube body; 13. a male connector; 14. a female joint; 20. an insulating assembly; 30. a positioning assembly; 40. a liquid storage tank; 50. a drive assembly; 60. a wellbore; 80. a cooler; 90. a filter assembly; 101. a first temperature sensor; 102. a second temperature sensor; 103. a flow sensor; 104. and a controller.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention provides a drill rod and a drilling fluid temperature control system, aiming at solving the problems of drilling fluid performance reduction, instability of downhole instruments and sensitivity reduction caused by high temperature in an oil extraction well in the prior art.
Referring to fig. 1 and 2, a drill pipe for producing an oil well, the drill pipe comprising a plurality of rod segments 10, the plurality of rod segments 10 being connected in series, wherein the rod segments 10 comprise: the heat insulation pipe comprises a first pipe body 11, a second pipe body 12 and a heat insulation assembly 20, wherein the first pipe body 11 is sleeved on the outer side of the second pipe body 12, and a cooling channel is arranged on the inner side of the second pipe body 12 and used for transferring cooling liquid; the heat insulation assembly 20 is disposed between the first pipe 11 and the second pipe 12 to insulate heat transfer between the first pipe 11 and the second pipe 12.
The drill rod of the invention is mainly applied to drilling oil and gas wells in the exploitation of oil fields, and can also be applied to geothermal wells and other wells, the drill rod comprises a drill bit and a plurality of rod sections 10, the number of the rod sections 10 is selected according to the depth of the well, then the rod sections 10 are spliced end to form the rod body of the drill rod, the main body of the rod section 10 of the invention comprises a first pipe body 11, a heat insulation component 20 and a second pipe body 12 from outside to inside in sequence, the heat insulation component 20 is arranged in a heat insulation cavity between the first pipe body 11 and the second pipe body 12, the heat insulation component 20 adopts heat insulation materials to reduce the heat transfer of the first pipe body 11 to the second pipe body 12, thereby ensuring that the temperature of the drilling fluid in a cooling channel inside the second pipe body 12 cannot be heated too fast due to the overhigh temperature of the external environment to influence the performance of the drilling fluid and the cooling effect of the drill bit as far as possible, therefore, the drilling fluid can cool the drill bit as much as possible, and the problem that the drill bit is easy to damage when used in a high-temperature environment is avoided.
The inner side of the first pipe 11 and/or the outer side of the second pipe 12 are provided with heat insulation grooves, and the heat insulation assembly 20 is arranged in the heat insulation grooves.
As shown in fig. 1, in order to facilitate installation of the heat insulation assembly 20, a ring of heat insulation grooves are formed inside the first pipe 11, the heat insulation assembly 20 may be filled with a material such as rubber or some coolant, and if the heat insulation material is a coolant, a sealing ring is required to be provided at a position where the first pipe 11 and the second pipe 12 are connected to seal the heat insulation groove, thereby preventing leakage of the coolant.
The first pipe 11 has a first end and a second end, and a positioning step 111 is disposed in the first end of the first pipe 11, so that when the second pipe 12 is inserted into the first pipe 11 from the second end, the positioning step 111 stops the second pipe 12 in the first pipe 11. The pole segment 10 further comprises: and the positioning assembly 30, the positioning assembly 30 is arranged at the inner side of the second end of the first pipe body 11, so that the second pipe body 12 is positioned in the first pipe body 11 when the second pipe body 12 is inserted into the first pipe body 11.
As shown in fig. 1, in order to fix the position of the second pipe 12 in the first pipe 11, in this embodiment, a stepped hole is formed at the first end of the first pipe 11, that is, the inner side of the end of the rod section 10 where the male connector 13 is disposed, a positioning step 111 is formed on the stepped hole, when the second pipe 12 is connected to the first pipe 11, one end of the second pipe 12 is inserted into the first pipe 11 from the second end until one end of the second pipe 12 abuts against the positioning step 111, at this time, the connection position of the second pipe 12 and the first pipe 11 is determined, and then the positioning assembly 30 is disposed at the inner side of the second end to lock the second pipe 12 in the first pipe 11, so as to prevent the second pipe 12 from coming out from the second end, or from shaking in the first pipe 11.
The pole segment 10 further comprises: a male connector 13 and a female connector 14, the male connector 13 being disposed at a first end; the female connector 14 is disposed at the second end; wherein the male connector 13 is adapted to be connected to the female connector 14 of an adjacent pole segment 10, the female connector 14 is adapted to be connected to the male connector 13 of an adjacent pole segment 10, and the male connector 13, the female connector 14 and the first pipe body 11 are integrally formed.
As shown in fig. 1, the pole segment 10 of this embodiment is provided with a male joint 13 at a first end, a female joint 14 at a second end, the outer side of the male joint 13 is of a tapered structure, the inner side of the female joint 14 is provided with a tapered hole, and when the pole segment 10 is connected by plugging, the outer side of the male joint 13 is plugged into the tapered hole of another pole segment 10 to complete the connection.
In addition, two pole segments 10 can also adopt the screw thread to connect, and is concrete, sets up the external screw thread in the male joint 13 outside, and female joint 14 is inboard to set up the internal thread, and two pole segments 10 screw-thread fit connect, still can set up as required and set up the through-hole in one side of male joint 13 and female joint 14, then connect two pole segments 10 through inserting round pin axle.
Further, the male connector 13 and the female connector 14 are respectively disposed at two opposite ends of the first pipe 11, and when the first pipe 11 is connected, a detachable form such as a screw connection may be adopted, and the first pipe 11, the male connector 13, and the female connector 14 may be integrally formed as needed.
A temperature control system comprises a drill rod, a liquid storage tank 40 and a driving assembly 50, wherein the drill rod is arranged in a shaft 60 and used for well drilling, drilling liquid is filled in the liquid storage tank 40, the driving assembly 50 conveys the drilling liquid into the drill rod to cool the drill rod, and the cooled drilling liquid is conveyed into the liquid storage tank 40, and the drill rod is the drill rod.
As shown in fig. 2, the present invention further provides a drilling fluid temperature control system for drilling, which uses a closed-loop drilling fluid to circulate and cool a drill bit, specifically, a drill pipe is arranged in a shaft 60 of an oil and gas well to perform drilling, a reservoir 40 and a driving assembly 50 are arranged on the well to provide the drilling fluid in the drill pipe, the driving assembly 50 can provide flowing power of the drilling fluid by using a hydraulic pump or a water pump, the reservoir 40 contains the drilling fluid, when in use, the water pump is opened, the water pump conveys the drilling fluid in the reservoir 40 to a cooling channel in the drill pipe, the cooling channel is communicated with the drill bit at the end of the drill pipe to cool the drill bit under the well, when the drilling fluid is cooled by the drill bit, the driving assembly 50 recovers the drilling fluid into the reservoir 40 to be recycled, a plurality of conveying pipelines are arranged in the temperature control system, for example, a first delivery conduit is provided between the reservoir 40 and the drill pipe, and a second delivery conduit is provided within the well bore 60 and the reservoir 40 for delivering drilling fluid.
The temperature control system further comprises: and a cooler 80, one end of the cooler 80 being connected to the shaft 60, the other end of the cooler 80 being connected to the reservoir 40, wherein the driving assembly 50 delivers the cooling fluid from the shaft 60 into the cooler 80 and into the reservoir 40 after the reservoir 40 is cooled by the cooler 80.
As shown in fig. 2, in order to rapidly cool the drilling fluid recovered to the reservoir 40, a cooler 80 is further disposed on the second conveying pipeline, and the cooler 80 is disposed on a pipeline between the shaft 60 and the reservoir 40, so as to cool the drilling fluid recovered from the shaft 60 and then convey the drilling fluid to the reservoir 40, thereby ensuring a cooling effect of recycling. The cooler 80 may be provided in plurality, and the plurality of coolers 80 may be provided in series or in parallel.
The drilling fluid temperature control system further comprises: a filter assembly 90, the filter assembly 90 being connected to the wellbore 60 for filtering drilling fluid in the wellbore 60; wherein the filter assembly 90 is further connected to the cooler 80 such that the drilling fluid is delivered to the cooler 80 after being filtered.
As shown in fig. 2, the drilling fluid temperature control system in this embodiment is further provided with a filter assembly 90 between the cooler 80 and the wellbore 60, the filter assembly 90 including a filter for filtering out some of the mud, rocks, debris, etc. that have been carried back by the drilling fluid from the drill bit of the drill pipe to protect the cooler 80 while preventing the reservoir 40 from being packed with sediment over time.
As shown in fig. 2, in order to realize automatic control of the drilling fluid to cool the drill bit and keep the drill bit stable within a preset range all the time, the temperature control system of the present application further includes a set of control system, which includes a controller 104, a first temperature sensor 101, a second temperature sensor 102, a flow sensor 103 and a cooler 80, first, the controller 104 receives the temperature and the flow of the drilling fluid flowing back into the reservoir 40, then, the energy required to be consumed to reduce the flow and the temperature of the drilling fluid to a preset temperature is calculated, the gear of the cooler 80 is controlled according to the calculation result or a set value, after the cooler 80 cools the drilling fluid, the second temperature sensor 102 measures the temperature of the drilling fluid flowing into the reservoir 40 after the cooler 80 cools, so as to verify that the temperature of the cooled drilling fluid meets the requirements, if not, the cooling effect of the cooler 80 is increased to increase the cooling of the cooling liquid, and if the temperature is lower than the preset temperature, the cooling output of the cooler 80 is reduced, so that the energy is saved. Furthermore, it is also possible to determine whether the cooler 80 is working properly or broken based on the temperatures of the drilling fluid measured by the second temperature sensor 102 and the first temperature sensor 101.
The filter assembly further comprises a vibrating screen, a sand remover, a mud remover and a centrifuge, wherein the vibrating screen is provided with a screen mesh for screening larger stones or debris on the drilling fluid, the drilling fluid enters the sand remover and the mud remover after being filtered by the vibrating screen, the sand remover and the mud remover further filter and screen smaller sand particles or impurities in the drilling fluid, in addition, the drilling fluid screened by the sand remover and the mud remover flows into the centrifuge for filtering, the centrifuge screens out solid shells or mud-like mixtures suspended in the drilling fluid by adopting centrifugal force, and therefore the precipitation of the impurities in the liquid storage tank 40 is reduced after the drilling fluid flows back into the liquid storage tank 40.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the drill rod of the invention is mainly applied to drilling oil and gas wells in the exploitation of oil fields, the drill rod comprises a drill bit and a plurality of rod sections 10, the number of the rod sections 10 is selected according to the drilling depth, then the rod bodies of the drill rod are spliced end to end by the rod sections 10, the main body of the rod section 10 of the invention comprises a first pipe body 11, a heat insulation assembly 20 and a second pipe body 12 from outside to inside in sequence, the heat insulation assembly 20 is arranged in a heat insulation cavity between the first pipe body 11 and the second pipe body 12, the heat insulation assembly 20 adopts heat insulation materials to reduce the heat transfer of the first pipe body 11 to the second pipe body 12, thereby ensuring that the temperature of the drilling fluid in a cooling channel inside the second pipe body 12 is not raised too fast due to the overhigh temperature of the external environment to influence the performance of the drilling fluid and the cooling effect of the drill bit, and enabling the drilling fluid to lower the temperature of the drill bit as much as possible, the problem that the drill bit is easy to damage when used in a high-temperature environment is avoided.
The invention provides a drilling fluid temperature control system which comprises a temperature control drill rod, a ground drilling fluid cooler and a control system. The temperature control drill rod containing the heat insulation layer is adopted to replace a conventional drill rod, the control system sets the cooling temperature of the drilling fluid according to the monitoring parameters, and the ground drilling fluid cooler is controlled to cool the drilling fluid returning to the wellhead to the set temperature. The system using method comprises the steps that after being cooled to a set temperature by a ground drilling fluid cooler, returned ground drilling fluid is pumped into a shaft by a hydraulic pump, the cooled drilling fluid descends along a cooling channel of an inner cavity of a temperature control drill rod, passes through a well bottom drill bit, ascends along an annulus, returns to a well head, is cooled by the cooler again, and is circulated in a reciprocating mode. The drill rod and the temperature control system solve the technical problem of drilling engineering caused by underground high temperature and ultrahigh temperature, realize effective regulation and control of the temperature of the whole circulating drilling fluid, and particularly achieve the purpose of greatly reducing the temperature of the circulating drilling fluid at the bottom of a well.
According to the drilling fluid temperature control system provided by the invention, a conventional drill rod is replaced by the temperature control drill rod, and compared with the conventional drill rod, the temperature control drill rod is additionally provided with the heat insulation assembly 20. The temperature control system includes a surface drilling fluid cooler 80 that cools the returning drilling fluid at the wellhead, which enters the reservoir 40. The inlet and outlet of the cooler 80 are provided with a temperature sensor and a flow sensor 103. The temperature control drill rod mainly comprises a drill rod outer pipe, a drill rod joint, a heat insulation assembly 20, a drill rod inner pipe and the like. The thermal isolation assembly 20 employs a low thermal conductivity material controller 104 to collect parameters of the temperature sensor and the flow sensor 103, set the drilling fluid cooling temperature, and control the drilling fluid cooler 80 to perform a cooling function.
The use method of the drilling fluid temperature control system is as follows, in the drilling process, the drilling fluid returning to the ground from the annular space of the shaft 60 is processed by the filtering component, the drilling fluid cooler 80 is started, and the drilling fluid enters the cooler 80. The controller 104 monitors temperature and flow parameters, automatically calculates and determines the refrigerating capacity of the drilling fluid cooling system, and controls the motor speed, power and other parameters of the cooling system, so as to meet the temperature setting requirement of the system. Cooled by the cooler 80 and returned to the reservoir 40 for re-pumping into the well bore 60 via the drive assembly 50. The drilling fluid travels down the inner cavity of the temperature controlled drill pipe, and the heat insulation assembly 20 in the temperature controlled drill pipe effectively prevents the heat from the formation from rapidly heating the drilling fluid, so that the temperature of the drilling fluid is kept low when the drilling fluid reaches the bottom of the well. Then, the drilling fluid passes through the drilling tool, goes upward along the annular space, returns to the wellhead, is continuously cooled by the cooler 80, returns to the liquid storage tank, and is pumped into the shaft 60 by the driving assembly 50, and the circulation is repeated, so that the aim of regulating and controlling the temperature of the drilling fluid in the whole circulation is fulfilled, and particularly the circulation temperature at the bottom of the well is greatly reduced.
The drilling fluid temperature control system solves the technical problem of drilling engineering caused by underground high temperature and ultrahigh temperature, realizes effective regulation and control of the temperature of the whole circulating drilling fluid, and particularly greatly reduces the temperature of the circulating drilling fluid at the bottom of a well.
The drilling fluid temperature control system of the present invention is comprised primarily of a surface drilling fluid cooler 80, a temperature controlled drill pipe, and a controller 104. The cooler 80 and the temperature control drill rod are integrated into the drilling fluid circulation link, the cooler 80 is arranged between the vibrating screen and the liquid storage tank, and the temperature control drill rod is adopted to partially or completely replace the conventional drill rod.
The cooler 80 is used to cool the drilling fluid returning from the wellhead down to a set temperature. Temperature sensors are provided at the inlet and outlet of the cooler 80 for monitoring the temperature of the drilling fluid before and after cooling. A flow sensor 103 is provided at the inlet of cooler 80 for monitoring the flow of drilling fluid into cooler 80.
The temperature control drill rod mainly comprises a first pipe body 11, a male joint 13, a heat insulation assembly 20, a second pipe body 12, a positioning assembly 30, a female joint 14 and the like.
The insulation assembly 20 is made of a material having a lower thermal conductivity than the drill pipe. According to the known theory of thermodynamics, the smaller the thermal conductivity coefficient of the material of the heat insulation assembly 20 is, the larger the total heat transfer resistance of the temperature control drill rod is, and the better the heat insulation effect is. When the thermal conductivity of the thermal insulation assembly 20 is lower than that of the drill pipe by more than one order of magnitude, the temperature-controlled drill pipe can greatly block the heat from being transferred between the inner surface and the outer surface of the drill pipe.
The controller 104 collects the temperature and flow parameters monitored by the inlet and outlet temperature sensors, the flow sensor 103 and the like, the controller 104 monitors the temperature and flow parameters, automatically calculates and determines the refrigerating capacity of the drilling fluid cooling system, and controls the motor rotating speed, the power and other parameters of the cooling system, so that the temperature setting requirement of the system is met.
The drilling fluid temperature control system has the following beneficial effects:
(1) the application of the drilling fluid temperature control system can greatly reduce the circulating temperature of the drilling fluid at the bottom of the well, solve the restriction problem of ultra-high temperature on the operation of a drilling project, ensure that the drilling can reach a deeper layer and a higher temperature layer which can not be reached by the prior art, and explore and develop more energy and resources;
(2) the temperature of the circulating drilling fluid of the shaft is reduced, so that the stable performance of the drilling fluid is favorably maintained, the service life and the working reliability of the downhole tool are improved, and the drilling cost is reduced;
(3) the complexity of underground accidents caused by high temperature is reduced, and the drilling safety is improved.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A drill rod for producing oil and gas wells, characterized in that it comprises a plurality of segments (10), a plurality of said segments (10) being connected in series, wherein said segments (10) comprise:
the cooling device comprises a first pipe body (11) and a second pipe body (12), wherein the first pipe body (11) is sleeved on the outer side of the second pipe body (12), and a cooling channel is arranged on the inner side of the second pipe body (12) and used for transferring cooling liquid;
an insulation assembly (20), the insulation assembly (20) being disposed between the first and second tubular bodies (11, 12) to insulate heat transfer between the first and second tubular bodies (11, 12).
2. Drill rod according to claim 1, characterized in that the inner side of the first tube (11) and/or the outer side of the second tube (12) is provided with an insulating groove, in which the insulating assembly (20) is arranged.
3. Drill rod according to claim 1, characterized in that the first tube (11) has a first end and a second end, a positioning step (111) being provided in the first end of the first tube (11) to stop the second tube (12) inside the first tube (11) when the second tube (12) is inserted into the first tube (11) from the second end.
4. A drill rod according to claim 3, characterized in that the rod segment (10) further comprises:
a positioning assembly (30), the positioning assembly (30) being disposed inside the second end of the first tube (11) to position the second tube (12) within the first tube (11) when the second tube (12) is inserted within the first tube (11).
5. A drill rod according to claim 3, characterized in that the rod segment (10) further comprises:
a male connector (13), the male connector (13) being disposed at the first end;
a female connector (14), the female connector (14) disposed at the second end;
wherein the male connector (13) is adapted to be connected to a female connector (14) of an adjacent pole segment (10), the female connector (14) is adapted to be connected to a male connector (13) of an adjacent pole segment (10), and the male connector (13), the female connector (14) and the first pipe body (11) are integrally formed.
6. A drilling fluid temperature control system comprising a drill pipe, a reservoir (40) and a drive assembly (50), wherein the drill pipe is arranged in a wellbore (60) for drilling a well, the reservoir (40) is filled with a drilling fluid, the drive assembly (50) conveys the drilling fluid into the drill pipe to cool the drill pipe and conveys the cooled drilling fluid into the reservoir (40), and the drill pipe is the drill pipe according to any one of claims 1 to 5.
7. The drilling fluid temperature control system of claim 6, further comprising:
a cooler (80), one end of the cooler (80) is connected with the shaft (60), the other end of the cooler (80) is connected with the liquid storage tank (40), wherein the driving assembly (50) conveys the cooling liquid from the shaft (60) into the cooler (80), and conveys the cooling liquid into the liquid storage tank (40) after the liquid storage tank (40) is cooled by the cooler (80).
8. The drilling fluid temperature control system of claim 7, further comprising:
a filter assembly (90), the filter assembly (90) being connected to the wellbore (60) to filter drilling fluid within the wellbore (60);
wherein the filter assembly (90) is further connected to the cooler (80) such that the drilling fluid is delivered to the cooler (80) after filtration.
9. The drilling fluid temperature control system of claim 7, wherein the cooler (80) has an inlet end and an outlet end, the drilling fluid entering the cooler (80) from the inlet end and exiting the cooler (80) from the outlet end after cooling, the drilling fluid temperature control system further comprising:
a first temperature sensor (101), said first temperature sensor (101) being arranged at said outlet end for measuring the temperature of the cooling liquid flowing out of said outlet end of said cooler (80);
a flow sensor (103), the flow sensor (103) being disposed at the inlet end for detecting a flow of drilling fluid into the cooler (80).
10. The drilling fluid temperature control system of claim 9, further comprising:
a second temperature sensor (102), the second temperature sensor (102) being disposed at the inlet end for measuring a temperature of the drilling fluid as it enters the cooler (80);
a controller (104), wherein the controller (104) is connected with the cooler (80), the first temperature sensor (101), the second temperature sensor (102) and the flow sensor (103) to control the cooler (80) to cool the cooling liquid according to the received detection information of the first temperature sensor (101), the second temperature sensor (102) and the flow sensor (103).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011012288.6A CN114251055A (en) | 2020-09-23 | 2020-09-23 | Drill rod and drilling fluid temperature control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011012288.6A CN114251055A (en) | 2020-09-23 | 2020-09-23 | Drill rod and drilling fluid temperature control system |
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| Publication Number | Publication Date |
|---|---|
| CN114251055A true CN114251055A (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011012288.6A Pending CN114251055A (en) | 2020-09-23 | 2020-09-23 | Drill rod and drilling fluid temperature control system |
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| CN (1) | CN114251055A (en) |
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| US4215753A (en) * | 1978-12-04 | 1980-08-05 | Elwood Champness | Drilling fluid cooling system |
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