CN-117072116-B - Multi-pass channel wellbore fluid cooling system and method

Abstract

The invention discloses a multi-channel shaft fluid cooling system and a method thereof, wherein the multi-channel shaft fluid cooling system at least comprises a cooling circulation system and a medium compression system, the cooling circulation system at least comprises a circulation joint, a circulation pipe column and a steering joint, a communicated flow passage is formed among the circulation joint, the circulation pipe column and the steering joint and is used for being communicated with the inside of a drill rod so as to inject shaft fluid into a shaft, the circulation joint, the circulation pipe column and the steering joint are formed with circulation channels, the medium compression system pressurizes cooling medium, the compressed cooling medium is injected into the circulation channels so as to cool the shaft fluid in the flow passage, and the cooling medium circularly flows between the circulation channels and the medium compression system. The invention utilizes the expansion heat absorption principle of the compressed cooling medium, and realizes the effective reduction of the well bore fluid and the bottom hole temperature by heat exchange between the cooling medium and the fluid in the well bore.

Inventors

• HAO WEIWEI
• Cheng tengfei
• WANG HAO
• HUANG PENGPENG
• LIU WEI
• LI MU
• LI YAFEI
• ZOU YI
• FU JIASHENG
• ZHAI XIAOQIANG

Assignees

• 中国石油天然气集团有限公司
• 中国石油集团工程技术研究院有限公司
• 北京石油机械有限公司

Dates

Publication Date

20260508

Application Date

20230627

Claims (16)

1. 1. A multi-pass flow channel wellbore fluid cooling system, comprising: The cooling circulation system at least comprises a circulation joint, a circulation pipe column and a steering joint, wherein the circulation joint and the steering joint are respectively connected with the top and the bottom of the circulation pipe column, the steering joint is used for connecting a drill rod downwards, a communicating through-flow channel is formed among the circulation joint, the circulation pipe column and the steering joint, and the through-flow channel is used for communicating with the interior of the drill rod so as to inject wellbore fluid into a wellbore; The medium compression system is used for pressurizing the cooling medium so as to inject the compressed cooling medium into the circulation channel, the cooling medium in the circulation channel is used for cooling the shaft fluid in the through-flow channel, and the cooling medium can circularly flow between the circulation channel and the medium compression system; The rotary plug valve comprises at least one plug valve and a control switch capable of driving the plug valve to rotate, wherein the plug valve is of a multi-layer sleeve structure, a first channel penetrating through the plug valve is formed in the plug valve, a second channel is arranged on the periphery of the first channel in a surrounding manner, a third channel is arranged on the periphery of the second channel in a surrounding manner, the second channel and the third channel are all penetrated through the plug valve, the plug valve is arranged in the circulation joint, the circulation pipe column or the steering joint, the plug valve is positioned on the circulation channel, the control switch is connected with the plug valve, the plug valve is rotated to a first station through the control switch, the plug valve is communicated with the circulation channel, the plug valve is rotated to a second station through the control switch, and the circulation channel is cut off; The top of plug valve is provided with first sealing washer, the below of plug valve is provided with the second sealing washer, works as the plug valve is in the state of switch-on, the top of first passageway, the top of second passageway and the top of third passageway with first sealing washer sealing fit, the bottom of first passageway, the bottom of second passageway and the third passageway with second sealing washer sealing fit.
2. 2. The multiple pass channel wellbore fluid cooling system of claim 1 wherein the media compression system comprises at least a compressor, a booster liquefaction pump stack, and a media storage device, an outlet of the compressor being connected to an inlet of the booster liquefaction pump stack, an outlet of the booster liquefaction pump stack being connected to an inlet of the media storage device.
3. 3. The multiple pass wellbore fluid cooling system of claim 2 wherein the outlet of the media storage device is connected to the inlet of the circulation channel, and an injection pump is disposed between the outlet of the media storage device and the inlet of the circulation channel.
4. 4. The multiple pass wellbore fluid cooling system of claim 2 further comprising a condensing power generation system comprising at least a condenser, an inlet of the condenser being connected to an outlet of the circulation channel, an outlet of the condenser being connected to an inlet of the compressor; the condenser comprises at least a heat exchange power generation device for converting kinetic energy of the returned cooling medium into electric energy.
5. 5. The multiple pass channel wellbore fluid cooling system of claim 4 wherein the condensing power generation system further comprises at least a power generation device having a power supply end electrically connected to the power supply end of the condenser and the power supply end of the compressor, respectively.
6. 6. The multiple pass channel wellbore fluid cooling system of claim 5 wherein the condensing power generation system further comprises a power supply system electrically connected to a power supply end of the power generation device and a power supply end of the heat exchange power generation device, respectively, the power supply end of the power supply system being electrically connected to a power supply end of the compressor.
7. 7. The multiple-pass wellbore fluid cooling system of claim 6 further comprising a monitoring control system having a signal receiving end in communication with the signal output of the cooling circulation system, the signal output of the medium compression system, the signal output of the condensing power generation system, and the signal output of the power supply system, respectively.
8. 8. The multiple fluid passage wellbore fluid cooling system of claim 1 wherein the circulation joint has a first joint inner passage extending through the circulation joint, a first annulus surrounding the first joint inner passage, a second annulus surrounding the first annulus, and an injection port and a return port in communication with the first annulus and the second annulus, respectively.
9. 9. The multiple flow channel wellbore fluid cooling system of claim 8 wherein the interior of the circulation string has a body lumen extending through the circulation string, the body lumen having a third annulus disposed around its periphery, the third annulus having a fourth annulus disposed around its periphery, the top of the third annulus being adapted to communicate with the bottom of the first annulus and the top of the fourth annulus being adapted to communicate with the bottom of the second annulus.
10. 10. The multiple fluid passage wellbore fluid cooling system of claim 9 wherein the interior of the steering joint has a second joint inner passage extending through the steering joint, a fifth annulus is provided around the outer circumference of the second joint inner passage, a sixth annulus is provided around the outer circumference of the fifth annulus, a top of the fifth annulus is in communication with a bottom of the third annulus, a top of the sixth annulus is in communication with a bottom of the fourth annulus, and a bottom of the fifth annulus is in communication with a bottom of the sixth annulus via a curved transition section.
11. 11. The multiple pass wellbore fluid cooling system of claim 10 wherein the first joint inner channel, the stem inner channel and the second joint inner channel are in sequential communication along the injection direction of the wellbore fluid to form the pass-through channel; And the first annulus, the third annulus, the fifth annulus, the bending section, the sixth annulus, the fourth annulus and the second annulus are sequentially communicated along the flowing direction of the cooling medium so as to form the circulating channel.
12. 12. A method of cooling a multi-pass wellbore fluid using the multi-pass wellbore fluid cooling system of any one of claims 1 to 11, the method comprising the steps of: step S1, a medium compression system carries out supercharging compression on a cooling medium; S2, injecting the compressed cooling medium into a circulation channel of a cooling circulation system to cool down shaft fluid in a circulation channel of the cooling circulation system through the cooling medium in the circulation channel; S3, returning the cooling medium cooled by the shaft fluid to the medium compression system through a circulating channel of the cooling circulating system; and S4, cycling the step S1 to the step S3.
13. 13. The multi-pass wellbore fluid cooling method of claim 12 wherein in step S2 the cooling medium expands to absorb heat upon entering the circulation passage and exchanges heat with the wellbore fluid in the pass-through passage to reduce the temperature of the wellbore fluid.
14. 14. The method of cooling a wellbore fluid with multiple flow channels according to claim 12, wherein in the steps S1 to S4, the opening degree of the plug valve is controlled to adjust the on-off states of the flow channels and the circulation channels.
15. 15. The multi-pass wellbore fluid cooling method of claim 12 wherein prior to step S3, the returned cooling medium is cooled by condensing a condenser in a power generation system.
16. 16. The multi-pass wellbore fluid cooling method of claim 12 wherein in steps S1-S4, the operating parameters of the cooling circulation system, the medium compression system, the condensation power generation system and the power supply system, and/or the temperature and/or pressure data at the wellbore outlet are monitored and recorded in real time by a monitoring control system.

Description

Multi-pass channel wellbore fluid cooling system and method Technical Field The invention relates to the field of oil and gas exploitation, in particular to a multi-channel shaft fluid cooling system and a method thereof, which relate to the fields of comprehensive utilization of petroleum, natural gas and geothermal energy, drilling and exploitation of natural gas hydrate and the like. Background With the development of shallow oil gas inferior, the drilling of oil gas has to advance to ultra-deep layers, so that the problems of ultra-deep high temperature and high pressure are increasingly highlighted, but the bottom hole temperature of some exploration areas reaches or breaks through 200 ℃, so that the prior measuring instrument, underground power drilling tool, shaft working fluid and other technologies reach the limit, the failure conditions of tools, additives and the like are continuously aggravated, the complex conditions of exploration operation are further highlighted and enlarged, the drilling construction difficulty is continuously increased, and the efficient development of land ultra-deep oil gas is severely restricted. Therefore, in the ultra-high temperature drilling operation environment, the technical bottleneck faced by the conventional technology is difficult to break through, and a new technology and a new method are needed to support the drilling operation so as to realize ultra-deep oil and gas benefit development. In order to solve the technical problems of failure of measuring instrument tools, underground power drilling tools, shaft working fluids and the like caused by ultra-high temperature of the bottom hole of an ultra-deep layer, the bottom hole temperature can be reduced to be within a proper technical range of the measuring instrument tools, the underground power drilling tools and the like by reducing the temperature of fluid in the shaft. The method mainly adopts the modes of natural cooling, low-temperature medium mixed cooling, forced cooling of a cooling device, temperature control of a heat insulation layer, phase change material additives and the like to solve the problem of cooling fluid in a shaft, and improves the cooling efficiency by using methods of increasing the length of a circulating line, blowing and spraying of an axial flow fan, increasing the heat dissipation area and the like. However, the method for cooling the well fluid can only realize small reduction of the temperature of the fluid in the well, is technically limited and influenced by conditions such as ambient temperature, heat convection rate, contact area and the like, cannot control and regulate the temperature according to the needs, and cannot meet the requirement of an ultra-deep well on effectively reducing the bottom hole temperature. Aiming at the problem that the use requirements of the conventional measuring instrument tools, the underground power drilling tools, the shaft working fluid and other technologies cannot be met due to the ultrahigh temperature of the ultra-deep well shaft. In the drilling process, technologies and measures for controlling the temperature of drilling fluid, such as natural cooling, low-temperature medium mixed cooling, forced cooling of a cooling device, temperature control of a heat insulation layer, phase change material additives and the like, are formed. However, in the face of ultra-deep well shaft ultra-high temperature difficult problems, the cooling amplitude and the underground cooling effect of the prior art are obviously insufficient, and the reason is that the conventional drilling fluid cooling technology is mainly influenced by conditions such as climatic conditions, fluid stability, ground equipment, site limitation, fluid self heat conduction performance and the like, so that the cooling effect is not ideal, and the obvious bottom hole temperature reduction and control effect are difficult to achieve by means of the conventional drilling means. Accordingly, the present inventors have developed a multi-pass wellbore fluid cooling system and method thereof to overcome the shortcomings of the prior art by years of experience and practice in the relevant industries. Disclosure of Invention The invention aims to provide a multi-channel shaft fluid cooling system and a method thereof, which utilize compressed medium expansion to absorb heat, exchange and transfer heat between the wall of a shaft and fluid in the shaft, effectively reduce the temperature of the fluid in the shaft and the well bottom by means of closed circulation, and adjust the injection amount of circulating cooling medium in a circulating channel to realize the adjustment of cooling amplitude. The object of the invention can be achieved by the following scheme: the invention provides a multi-channel wellbore fluid cooling system, comprising: The cooling circulation system at least comprises a circulation joint, a circulation pipe column and a steering joint, wherein the circulatio