Underground fluid monitoring signal real-time acquisition device for optical fiber coiled tubing

Abstract

The utility model discloses an underground fluid monitoring signal real-time acquisition device for an optical fiber continuous oil pipe, which comprises a continuous oil pipe body, a straight optical component is welded in a welding seam on the outer side wall of the continuous oil pipe body, and a spiral optical component is wound on the outer side wall of the continuous oil pipe body. Wherein after the straight optical assembly and the spiral optical assembly are connected with the coiled tubing body, the space between the straight optical assembly and the coiled tubing body and the space between the spiral optical assembly and the coiled tubing body are filled and fixed through high-temperature-resistant flexible composite materials; according to the utility model, fluid noise data, strain data and temperature data inside and outside the underground coiled tubing body are monitored and measured in real time through the straight optical assembly, and a fluid production or gas production profile or a water absorption or gas absorption profile and changes thereof of an oil and gas production well can be calculated and monitored, so that long-term real-time dynamic monitoring of the oil and gas production well is realized; therefore, scientific management of oil and gas reservoirs is achieved, the oil and gas recovery efficiency is improved, and the method is suitable for being widely popularized and used.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical fiber continuous oil pipe monitoring, in particular to a downhole fluid monitoring signal real-time acquisition device for optical fiber continuous oil pipe. Background Art

[0002] Conventional oil pipes are in the form of single pieces, connected together by threaded structures, and connected before going down the well. Coiled tubing is an uninterrupted tubing made by welding or more advanced seamless connection technology, which can be several kilometers long. The diameter is about tens of millimeters. Coiled tubing is a pipe made of low-carbon alloy steel, which has good flexibility. It is also called flexible tubing. A roll of coiled tubing is several kilometers long. It can replace conventional oil pipes for many operations. Coiled tubing operation equipment has the characteristics of pressure operation and continuous lifting and lowering. The equipment is small in size, fast in operation cycle, and low in cost. In addition to being used for oil gathering and transportation, coiled tubing can currently be widely used in oilfield drilling, completion, fracturing, acidizing, drainage, oil testing, oil and gas production, well repair, gathering and transportation pipeline unblocking and other fields.

[0003] At present, laying permanent armored optical cables outside metal casings faces the difficulties of difficult construction operations, high costs, difficulty in detecting the position of optical cables, and immature downhole avoidance technology, which leads to the armored optical cables being cut during perforating operations. In addition, the armored optical cables laid in the casing can only be used for temporary data collection, because the armored optical cables laid in the casing will affect or interfere with other downhole operations, and the armored optical cables cannot be laid in the casing for a long time for monitoring operations; although laying armored optical cables in continuous oil pipes can be used for microseismic monitoring and production profile measurement of horizontal well sections, it can only be temporary, and continuous oil pipes with built-in armored optical cables cannot be laid in horizontal wells for a long time without affecting the production of downhole oil and gas; for this reason, it is necessary to design a downhole fluid monitoring signal real-time acquisition device for optical fiber continuous oil pipes. Summary of the invention

[0004] In view of the above situation, in order to solve the problems faced by the current permanent armored optical cable laid outside the metal casing, such as the difficulty in construction work, high cost, difficulty in detecting the position of the optical cable, and the immature downhole avoidance technology, which leads to the armored optical cable being cut during perforating operations, and the armored optical cable laid in the casing can only perform temporary data collection work, because the armored optical cable laid in the casing will affect or interfere with other operations downhole, and the armored optical cable cannot be laid in the casing for a long time for monitoring operations, the utility model provides a downhole fluid monitoring signal real-time acquisition device for optical fiber continuous oil pipe, which effectively realizes the real-time monitoring and measurement of fluid noise data, strain data, and temperature data inside and outside the downhole continuous oil pipe body through straight optical components, and can calculate and monitor the liquid production or gas production profile or water absorption or gas absorption profile and its changes of the oil and gas production well, thereby realizing long-term real-time dynamic monitoring of the oil and gas production well, and then realizing the scientific management of oil and gas reservoirs and improving the oil and gas recovery rate.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a real-time acquisition device for downhole fluid monitoring signals of optical fiber continuous oil pipe, comprising a continuous oil pipe body, a straight optical component welded in the weld of the outer wall of the continuous oil pipe body, and a spiral optical component wrapped around the outer wall of the continuous oil pipe body, wherein the straight optical component and the spiral optical component are both filled and fixed between the continuous oil pipe body and the continuous oil pipe body after being connected to the continuous oil pipe body, and the outer wall of the high-temperature resistant flexible composite material is coated with a thin layer of stainless steel sleeve; the straight optical component and the spiral optical component are both used for real-time monitoring and acquisition of DAS signals, DTS signals, DSS signals and DPS signals inside and outside the downhole continuous oil pipe body.

[0006] The aforementioned downhole fluid monitoring signal real-time acquisition device for optical fiber continuous oil pipe, the straight optical component includes a straight single-mode optical fiber, a straight multi-mode optical fiber, a straight single-mode strain optical fiber and a straight continuous grating optical fiber, the straight single-mode optical fiber is used to collect and output DAS signals, the straight multi-mode optical fiber is used to collect and output DTS signals, the straight single-mode strain optical fiber is used to collect and output DSS signals, and the straight continuous grating optical fiber is used to collect and output DPS signals.

[0007] The aforementioned downhole fluid monitoring signal real-time acquisition device for optical fiber continuous oil pipe, the spiral optical component includes a spiral single-mode optical fiber, a spiral multimode optical fiber, a spiral single-mode strain optical fiber and a spiral continuous grating optical fiber, the spiral single-mode optical fiber is used to collect and output DAS signals, the spiral multimode optical fiber is used to collect and output DTS signals, the spiral single-mode strain optical fiber is used to collect and output DSS signals, and the spiral continuous grating optical fiber is used to collect and output DPS signals.

[0008] The above-mentioned downhole fluid monitoring signal real-time acquisition device for optical fiber coiled tubing, the straight single-mode optical fiber, straight multi-mode optical fiber, straight single-mode strain optical fiber and straight continuous grating optical fiber are all made of high-temperature resistant and hydrogen-damage resistant optical fiber.

[0009] The aforementioned downhole fluid monitoring signal real-time acquisition device for optical fiber continuous oil pipe, the number of spiral optical components is three groups, and the spiral winding angle of each group of spiral optical components is different, wherein the spiral winding angles of the three groups of spiral optical components are degrees, degrees and degrees respectively.

[0010] The aforementioned downhole fluid monitoring signal real-time acquisition device for optical fiber continuous oil pipe, the straight optical component is placed in the middle of the weld of the continuous oil pipe body before the continuous oil pipe body is welded into a pipe, and the straight optical component is inlaid and welded with the continuous oil pipe body when the continuous oil pipe body is welded and formed.

[0011] The above-mentioned downhole fluid monitoring signal real-time acquisition device for optical fiber continuous oil pipe, the straight single-mode strain optical fiber and the spiral single-mode strain optical fiber are both made by coating the outer wall of the straight single-mode optical fiber with a high-temperature resistant and high-strength flexible composite material and making the diameter of the straight single-mode optical fiber 1mm to 2mm and then placing it in a stainless steel tube of corresponding size.

[0012] In the above-mentioned downhole fluid monitoring signal real-time acquisition device for optical fiber coiled tubing, the straight single-mode strain optical fiber and the spiral single-mode strain optical fiber are both used to sense the stress and strain outside the stainless steel pipe.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] (1) The utility model can calculate and monitor the liquid production or gas production profile or water absorption or gas absorption profile and its changes of the oil and gas production wells by real-time monitoring and measuring the fluid noise data, strain data and temperature data inside and outside the downhole continuous oil pipe body through the straight optical component, thereby realizing the long-term real-time dynamic monitoring of the oil and gas production wells, and further realizing the scientific management of the oil and gas reservoirs and improving the oil and gas recovery rate.

[0015] (2) The utility model can monitor and measure the temperature data and three-component stress data inside and outside the coiled tubing body in real time by providing a spiral optical component, so as to obtain the real three-component stress data distribution after eliminating the temperature influence, and then establish a three-dimensional stress field model based on the real three-component stress data distribution diagram, so as to optimize the design of the perforation position and fracturing section of the downhole coiled tubing body, and then monitor and measure the three-component microseismic data in real time by using the spiral optical component, so as to record the three-component microseismic data in the formation around the coiled tubing, and then timely adjust and optimize the fracturing parameters and optimize the well spacing and segment spacing of the multi-branch horizontal well according to the distribution characteristics of the three-component microseismic data in the underground three-dimensional space.

[0016] (3) The utility model sets three groups of spiral optical components with different spiral angles. When real-time monitoring and measuring three-component stress signals, three-component microseismic events and three-component wellbore seismic signals are performed, the spiral angle optical fiber with the best real-time monitoring and measurement effect can be selected for recording and calculation among the three spiral angles, thereby achieving better monitoring and measurement effects for three-component stress signals, three-component microseismic events and three-component wellbore seismic signals.

[0017] (4) The distributed optical fiber sensing technology designed by the utility model is the best choice for permanent downhole monitoring and is the basis for realizing the true informatization and intelligence of oil and gas field production. The utility model has the function of providing real-time, high-density, multi-parameter parameters for the entire life cycle of oil and gas field development, which not only improves the scientific level and efficiency of decision-making, but also does not require interruption of production for downhole operations, and has the effect of no production loss, no operating cost, no personnel risk and no environmental pollution risk. The utility model not only provides more real-time and high-quality data, but also has a high cost-effectiveness, and a one-time investment with lifelong benefits. It does not require special equipment and can be easily applied to high-angle and horizontal wells, and does not affect downhole operations in casing or tubing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the specific structure of the straight optical component and the spiral optical component of the utility model;

[0021] Figure 3 It is a schematic diagram of the spiral winding of the spiral optical component of the utility model;

[0022] Figure 4 This is a schematic diagram of the high temperature resistant flexible composite material and thin stainless steel sleeve structure of the utility model;

[0023] In the figure: 1. Continuous oil pipe body; 2. Straight optical component; 201. Straight single-mode optical fiber; 202. Straight multi-mode optical fiber; 203. Straight single-mode strain optical fiber; 204. Straight continuous grating optical fiber; 3. Spiral optical component; 301. Spiral single-mode optical fiber; 302. Spiral multi-mode optical fiber; 303. Spiral single-mode strain optical fiber; 304. Spiral continuous grating optical fiber; 4. High temperature resistant flexible composite material; 5. Thin stainless steel sleeve. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Example

[0025] Depend on Figures 1 to 4 The utility model provides a real-time acquisition device for downhole fluid monitoring signals of optical fiber continuous oil pipe, comprising a continuous oil pipe body 1, a straight optical component 2 is welded in the weld of the outer wall of the continuous oil pipe body 1, and a spiral optical component 3 is wound around the outer wall of the continuous oil pipe body 1, wherein the straight optical component 2 and the spiral optical component 3 are filled and fixed between the continuous oil pipe body 1 and the continuous oil pipe body 1 with a high-temperature resistant flexible composite material 4 after being connected to the continuous oil pipe body 1, and the outer wall of the high-temperature resistant flexible composite material 4 is coated with a thin layer of stainless steel sleeve 5; the straight optical component 2 and the spiral optical component 3 are both used for real-time monitoring and acquisition of DAS signals, DTS signals, DSS signals and DPS signals inside and outside the downhole continuous oil pipe body 1, wherein the DAS signal is a distributed acoustic wave sensor signal, the DTS signal is a distributed temperature sensor signal, the DSS signal is a distributed stress sensor signal and the DPS signal is a distributed pressure sensor signal.

[0026] Specifically, the straight optical component 2 includes a straight single-mode optical fiber 201, a straight multimode optical fiber 202, a straight single-mode strain optical fiber 203 and a straight continuous grating optical fiber 204. The straight single-mode optical fiber 201 is used to collect and output DAS signals, the straight multimode optical fiber 202 is used to collect and output DTS signals, the straight single-mode strain optical fiber 203 is used to collect and output DSS signals, and the straight continuous grating optical fiber 204 is used to collect and output DPS signals. By real-time monitoring and measuring of fluid noise data, strain data, and temperature data inside and outside the downhole continuous oil pipe body 1 by the straight optical component 2, the liquid production or gas production profile or water absorption or gas absorption profile and its changes of the oil and gas production wells can be calculated and monitored, thereby realizing long-term real-time dynamic monitoring of the oil and gas production wells, and further realizing scientific management of oil and gas reservoirs and improving oil and gas recovery rates.

[0027] Specifically, the spiral optical component 3 includes a spiral single-mode optical fiber 301, a spiral multimode optical fiber 302, a spiral single-mode strain optical fiber 303 and a spiral continuous grating optical fiber 304. The spiral single-mode optical fiber 301 is used to collect and output DAS signals, the spiral multimode optical fiber 302 is used to collect and output DTS signals, the spiral single-mode strain optical fiber 303 is used to collect and output DSS signals, and the spiral continuous grating optical fiber 304 is used to collect and output DPS signals. By setting up the spiral optical component 3, the temperature data and three-component stress data inside and outside the continuous oil pipe body can be monitored and measured in real time, so that the real three-component stress data distribution after eliminating the temperature effect can be obtained, and then a three-dimensional stress field model is established according to the real three-component stress data distribution diagram, so as to optimize the design of the perforation position and fracturing section of the downhole continuous oil pipe body.

[0028] Specifically, the straight single-mode optical fiber 201, the straight multi-mode optical fiber 202, the straight single-mode strained optical fiber 203 and the straight continuous grating optical fiber 204 are all made of high-temperature resistant and hydrogen-damage-resistant optical fibers. By making the straight single-mode optical fiber 201, the straight multi-mode optical fiber 202, the straight single-mode strained optical fiber 203 and the straight continuous grating optical fiber 204 into high-temperature resistant and hydrogen-damage-resistant optical fibers, their service life and reliability are improved.

[0029] Specifically, the number of the spiral optical components 3 is three groups, and the spiral winding angle of each group of the spiral optical components 3 is different, wherein the spiral winding angles of the three groups of the spiral optical components 3 are 30 degrees, 45 degrees and 60 degrees, respectively. By setting three groups of spiral optical components 3 with different spiral angles, when real-time monitoring and measurement of three-component stress signals, three-component microseismic events and three-component well seismic signals are performed, the spiral angle optical fiber with the best real-time monitoring and measurement effect among the three spiral angles can be selected for recording and calculation, so that better monitoring and measurement effects can be achieved when facing three-component stress signals, three-component microseismic events and three-component well seismic signals.

[0030] Specifically, the straight optical component 2 is placed in the middle of the weld of the continuous tubing body 1 before the continuous tubing body 1 is welded into a pipe, and the straight optical component 2 is inlaid and welded with the continuous tubing body 1 when the continuous tubing body 1 is welded and formed. By placing the straight optical component 2 in the middle of the weld of the continuous tubing body 1 before the continuous tubing body 1 is welded into a pipe, the connections between the straight optical component 2 and the spiral optical component 3 and the continuous tubing body 1 do not interfere with each other.

[0031] Specifically, the straight single-mode strain optical fiber 203 and the spiral single-mode strain optical fiber 303 are both made by coating the outer wall of the straight single-mode optical fiber 201 with a high-temperature resistant and high-strength flexible composite material and making the diameter of the straight single-mode optical fiber 201 1 mm to 2 mm, and then placing them in a stainless steel tube of corresponding size. Distributed stress sensing signals can be collected through the straight single-mode strain optical fiber 203 and the spiral single-mode strain optical fiber 303.

[0032] Specifically, the straight single-mode strain fiber 203 and the spiral single-mode strain fiber 303 are both used to sense the stress and strain outside the stainless steel pipe. The spiral optical component 3 can monitor and measure the three-component microseismic data in real time, thereby recording the three-component microseismic data in the formation around the continuous oil pipe, and then timely adjust and optimize the fracturing parameters and optimize the design of the well spacing and segment spacing of the multi-branch horizontal wells according to the distribution characteristics of the three-component microseismic data in the three-dimensional underground space.

[0033] When in use, firstly, the fluid noise data, strain data, and temperature data inside and outside the downhole continuous tubing body 1 are monitored and measured in real time through the straight optical component 2, so that the liquid production or gas production profile or water absorption or gas absorption profile and its changes of the oil and gas production well can be calculated and monitored, thereby realizing long-term real-time dynamic monitoring of the oil and gas production well, and then realizing the scientific management of the oil and gas reservoir and improving the oil and gas recovery rate. Then, the temperature data and three-component stress data inside and outside the continuous tubing body can be monitored and measured in real time through the set spiral optical component 3, so that the real three-component stress data distribution after eliminating the temperature effect can be obtained, and then a three-dimensional stress field model is established according to the real three-component stress data distribution diagram, so as to optimize the design of the perforation position and fracturing section of the downhole continuous tubing body, and then The spiral optical component 3 can be used to monitor and measure three-component microseismic data in real time, so that the three-component microseismic data in the strata around the continuous oil pipe can be recorded, and then the fracturing parameters can be timely adjusted and optimized according to the distribution characteristics of the three-component microseismic data in the underground three-dimensional space, and the well spacing and segment spacing of the multi-branch horizontal wells can be optimized. Subsequently, by setting three groups of spiral optical components 3 with different spiral angles, when real-time monitoring and measuring three-component stress signals, three-component microseismic events and three-component well seismic signals can be selected to record and calculate the spiral angle optical fiber with the best real-time monitoring and measurement effect among the three spiral angles, so that better monitoring and measurement effects can be achieved when facing three-component stress signals, three-component microseismic events and three-component well seismic signals.

[0034] The components used in the present invention are all universal standard components or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A downhole fluid monitoring signal real-time acquisition device for optical fiber coiled tubing, comprising a coiled tubing body (1), characterized in that: A straight optical component (2) is welded in the weld seam of the outer wall of the coiled tubing body (1), and a spiral optical component (3) is wound around the outer wall of the coiled tubing body (1), wherein the straight optical component (2) and the spiral optical component (3) are filled and fixed between the coiled tubing body (1) and the coiled tubing body (1) after being connected to the coiled tubing body (1), and the outer wall of the coiled tubing body (1) is covered with a thin layer of stainless steel sleeve (5); The straight optical component (2) and the spiral optical component (3) are both used for real-time monitoring and collection of DAS signals, DTS signals, DSS signals and DPS signals inside and outside the downhole continuous oil pipe body (1).

2. The real-time acquisition device for downhole fluid monitoring signals for optical fiber coiled tubing according to claim 1, characterized in that: The straight optical component (2) comprises a straight single-mode optical fiber (201), a straight multi-mode optical fiber (202), a straight single-mode strain optical fiber (203) and a straight continuous grating optical fiber (204); the straight single-mode optical fiber (201) is used to collect and output a DAS signal, the straight multi-mode optical fiber (202) is used to collect and output a DTS signal, the straight single-mode strain optical fiber (203) is used to collect and output a DSS signal, and the straight continuous grating optical fiber (204) is used to collect and output a DPS signal.

3. The real-time acquisition device for downhole fluid monitoring signals for optical fiber coiled tubing according to claim 2, characterized in that: The spiral optical component (3) comprises a spiral single-mode optical fiber (301), a spiral multimode optical fiber (302), a spiral single-mode strain optical fiber (303) and a spiral continuous grating optical fiber (304); the spiral single-mode optical fiber (301) is used to collect and output a DAS signal, the spiral multimode optical fiber (302) is used to collect and output a DTS signal, the spiral single-mode strain optical fiber (303) is used to collect and output a DSS signal, and the spiral continuous grating optical fiber (304) is used to collect and output a DPS signal.

4. The real-time acquisition device for downhole fluid monitoring signals for optical fiber coiled tubing according to claim 2, characterized in that: The straight single-mode optical fiber (201), the straight multi-mode optical fiber (202), the straight single-mode strain optical fiber (203) and the straight continuous grating optical fiber (204) are all made of high-temperature resistant and hydrogen-damage resistant optical fibers.

5. The real-time acquisition device for downhole fluid monitoring signals for optical fiber coiled tubing according to claim 3, characterized in that: The number of the spiral optical components (3) is three groups, and the spiral winding angle of each group of the spiral optical components (3) is different, wherein the spiral winding angles of the three groups of the spiral optical components (3) are 30 degrees, 45 degrees and 60 degrees respectively.

6. The real-time acquisition device for downhole fluid monitoring signals for optical fiber coiled tubing according to claim 2, characterized in that: The straight optical component (2) is placed in the middle of the weld of the coiled tubing body (1) before the coiled tubing body (1) is welded into a pipe, and the straight optical component (2) is embedded and welded with the coiled tubing body (1) when the coiled tubing body (1) is welded into shape.

7. The real-time acquisition device for downhole fluid monitoring signals for optical fiber coiled tubing according to claim 3, characterized in that: The straight single-mode strain optical fiber (203) and the spiral single-mode strain optical fiber (303) are both manufactured by coating the outer wall of the straight single-mode optical fiber (201) with a high-temperature resistant and high-strength flexible composite material, making the diameter of the straight single-mode optical fiber (201) 1 mm to 2 mm, and then placing them in a stainless steel tube of corresponding size.

8. The real-time acquisition device for downhole fluid monitoring signals for optical fiber coiled tubing according to claim 3, characterized in that: The straight single-mode strain optical fiber (203) and the spiral single-mode strain optical fiber (303) are both used to sense stress and strain outside the stainless steel pipe.

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