Coiled tubing assembly for directional drilling system

Abstract

The utility model discloses a coiled tubing assembly for a directional drilling system, which comprises a coiled tubing unit, the outer side wall of the coiled tubing unit is provided with a straight light unit, a straight strain light unit, a power supply control cable and a hydraulic control pipeline, and the outer side wall of the coiled tubing unit is coated with a flexible composite layer. Wherein the flexible composite layer is used for further wrapping and fixing the straight optical unit, the straight strain optical unit, the power supply control cable, the hydraulic control pipeline and the coiled tubing unit; according to the utility model, the function of monitoring DSS signals, DAS signals, DTS signals and DPS signals inside and outside the coiled tubing body in real time in the drilling process is realized, and the function of monitoring well sections, bearing high stress, of the coiled tubing body, the external hydraulic guider and the external electric drill bit in real time in the drilling process is also realized; local damage to the coiled tubing body and the drilling tool is prevented, the drilling efficiency is improved, and the coiled tubing is suitable for being widely popularized and used.

Description

Technical Field

[0001] The utility model belongs to the technical field of downhole drilling, in particular to a continuous oil pipe assembly for a directional drilling system. Background Art

[0002] Coiled tubing initially gained a foothold in the market as an economical and effective wellbore cleaning tool. The economic income from traditional well repair and completion operations accounts for more than three-quarters of the total income from coiled tubing operations. The application scope of coiled tubing equipment in oil and gas fields continues to expand, and coiled tubing drilling technology and coiled tubing fracturing technology have become the two fastest-growing technologies in recent years. Coiled tubing drilling technology has become an important technology for economically and efficiently deepening drilling, sidetracking old wells, and drilling shallow wells in various oil and gas reservoirs, and has won a position in the drilling market, especially in the underbalanced horizontal drilling market.

[0003] At present, with the continuous development of technology, continuous tubing drilling technology has been widely used. However, laying permanent armored optical cables, optoelectronic composite cables, electrical cables and hydraulic pipelines outside the metal casing faces the difficulties of construction and high costs, and the azimuth detection of various cables is difficult. At the same time, the underground avoidance technology is not mature, which makes the armored cables easy to be cut during operation. The armored optical cables, optoelectronic composite cables, electrical cables and hydraulic pipelines laid in the casing can only perform temporary data collection and work, because the armored optical cables laid in the casing will affect or interfere with other operations in the well, and the armored optical cables cannot be laid in the casing for a long time for monitoring operations. For this reason, it is necessary to design a continuous tubing assembly for a directional drilling system. Summary of the invention

[0004] In view of the above situation, in order to overcome the current difficulties and high costs in the construction of permanent armored optical cables, optoelectronic composite cables, electrical cables and hydraulic pipelines outside metal casings, and the difficulty in detecting the azimuths of various cables, and the immature downhole avoidance technology, which leads to the problem that the armored cables are easily cut during operation, the utility model provides a continuous tubing assembly for a directional drilling system, which effectively realizes the function of real-time monitoring of DSS signals, DAS signals, DTS signals and DPS signals inside and outside the continuous tubing body during drilling, and also realizes the function of real-time monitoring of the continuous tubing body, external hydraulic guide and external electric drill bit in the well section subjected to high stress during drilling, thereby preventing local damage to the continuous tubing body and drilling tools and improving drilling efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coiled tubing assembly for a directional drilling system, comprising a coiled tubing unit, wherein the outer wall of the coiled tubing unit is provided with a straight light unit, a straight strain light unit, a power supply control cable and a hydraulic control pipeline, and the outer wall of the coiled tubing unit is also coated with a flexible composite layer, wherein the flexible composite layer is used to further wrap and fix the straight light unit, the straight strain light unit, the power supply control cable and the hydraulic control pipeline with the coiled tubing unit, and the outer wall of the flexible composite layer is sleeved with a stainless steel protective sleeve; the power supply control cable is used to connect an external electric drill bit with an external power supply control module, and the hydraulic control pipeline is used to connect an external hydraulic guide with an external control module; the straight light unit and the straight strain light unit are used to monitor the DAS signal, DTS signal, DPS signal and DSS signal inside and outside the coiled tubing unit in real time during the drilling operation, and simultaneously monitor the status of the coiled tubing unit, the external hydraulic guide and the external electric drill bit during the drilling operation and the environmental changes inside and outside the wellbore.

[0006] The aforementioned continuous oil pipe assembly for a directional drilling system, the straight optical unit includes a straight single-mode optical fiber, a straight multi-mode optical fiber and a straight continuous grating optical fiber, the straight single-mode optical fiber is connected to the signal input end of an external DAS signal input module, the straight multi-mode optical fiber is connected to the signal input end of an external DTS signal input module, and the straight continuous grating optical fiber is connected to the signal input end of an external DPS signal input module, wherein the straight single-mode optical fiber, the straight multi-mode optical fiber and the straight continuous grating optical fiber are all made of high-temperature resistant and hydrogen-damage-resistant optical fiber.

[0007] In the aforementioned coiled tubing assembly for a directional drilling system, a straight single-mode strain optical fiber is arranged inside the straight strain optical unit, and the straight single-mode strain optical fiber is connected to the signal input end of the DSS signal input module.

[0008] The aforementioned continuous tubing assembly for a directional drilling system, wherein the straight single-mode strain optical fiber is made by extruding a high-temperature resistant and high-strength flexible composite material on the outer wall of the straight single-mode optical fiber and increasing the diameter of the straight single-mode optical fiber to 1mm to 2mm, and then tightly wrapping it inside a stainless steel tube with an inner diameter of 1mm to 2mm, and the straight single-mode strain optical fiber is used to sense stress and strain outside the stainless steel tube.

[0009] The aforementioned coiled tubing assembly for a directional drilling system, the coiled tubing unit comprises a coiled tubing body, and the outer side wall of the coiled tubing body is evenly provided with a first groove, a second groove and a third groove.

[0010] The aforementioned continuous tubing assembly for a directional drilling system, wherein the number of the first slots is two, and the inner side walls of the two first slots are respectively wedged with the outer side walls of the straight light unit and the straight strain light unit, and the number of the second slots is two, and the inner side walls of the two second slots are wedged with the outer side walls of the hydraulic control pipeline.

[0011] In the aforementioned continuous tubing assembly for a directional drilling system, the number of the third slots is multiple, and the inner side walls of the multiple third slots are wedged with the outer side walls of the power supply control cable.

[0012] In the aforementioned coiled tubing assembly for a directional drilling system, the straight optical unit, the straight strain optical unit, the hydraulic control pipeline and the power supply control cable are connected to the coiled tubing body by inlay welding.

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

[0014] (1) The utility model can monitor the DSS signals on both sides of the continuous tubing body in real time during the drilling process through the straight single-mode strain optical fiber arranged on the outer side wall of the continuous tubing body, and can respectively monitor the DAS signals, DTS signals and DPS signals on both sides of the continuous tubing body in real time through the straight single-mode optical fiber, straight multi-mode optical fiber and straight continuous grating optical fiber arranged on the outer side wall of the continuous tubing body, so that the continuous tubing assembly can effectively monitor the DSS signals, DAS signals, DTS signals and DPS signals on both sides of the continuous tubing body in real time during the drilling process, and the signals obtained by monitoring can be output to an external composite modem in real time. The continuous tubing assembly has a simple structure and a good monitoring effect.

[0015] (2) The utility model utilizes a straight light unit and a straight strain light unit to monitor the fluid noise, temperature, pressure, stress and strain in the underground well section and inside and outside the drilling tool in real time during the drilling process, and then performs local damage prevention operations on the continuous tubing body, the external hydraulic guide and the external electric drill bit, effectively realizing the function of the continuous tubing assembly to monitor the well section subjected to high stress of the continuous tubing body, the external hydraulic guide and the external electric drill bit in real time during the drilling process, preventing the continuous tubing body, the external hydraulic guide and the external electric drill bit from being locally damaged, ensuring the safety of the drilling process and improving the drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the coiled tubing unit of the utility model;

[0019] Figure 3 This is a schematic diagram of the outer surface structure of the coiled tubing body of the utility model;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the coiled tubing body of the utility model;

[0021] In the figure: 1. Continuous tubing unit; 101. Continuous tubing body; 102. First slot; 103. Second slot; 104. Third slot; 2. Straight optical unit; 201. Straight single-mode optical fiber; 202. Straight multi-mode optical fiber; 203. Straight continuous grating optical fiber; 3. Straight strain optical unit; 4. Power supply control cable; 5. Hydraulic control pipeline; 6. Flexible composite layer; 7. Stainless steel protective cover. DETAILED DESCRIPTION

[0022] 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

[0023] Depend on Figures 1 to 4The utility model provides a continuous tubing assembly for a directional drilling system, comprising a continuous tubing unit 1, wherein the outer wall of the continuous tubing unit 1 is provided with a straight light unit 2, a straight strain light unit 3, a power supply control cable 4 and a hydraulic control pipeline 5, and the outer wall of the continuous tubing unit 1 is also coated with a flexible composite layer 6, wherein the flexible composite layer 6 is used to further wrap and fix the straight light unit 2, the straight strain light unit 3, the power supply control cable 4 and the hydraulic control pipeline 5 with the continuous tubing unit 1, and the outer wall of the flexible composite layer 6 is sleeved with a stainless steel protective sleeve 7; the power supply control cable 4 is used to connect an external electric drill bit to an external power supply control module, and the hydraulic control pipeline 5 is used to connect an external hydraulic The pressure guide is connected to the external control module; the straight light unit 2 and the straight strain light unit 3 are used to monitor the DAS signal, DTS signal, DPS signal and DSS signal inside and outside the coiled tubing unit 1 in real time during the drilling operation, and simultaneously monitor the status of the coiled tubing unit 1, the external hydraulic guide and the external electric drill bit in the drilling operation and the environmental changes inside and outside the wellbore. By providing the straight light unit 2 and the straight strain light unit 3, the DAS signal, DTS signal, DPS signal and DSS signal inside and outside the coiled tubing unit 1 can be monitored in real time during the drilling operation, and the status of the coiled tubing unit 1, the external hydraulic guide and the external electric drill bit in the drilling operation and the environmental changes inside and outside the wellbore can be monitored simultaneously.

[0024] Specifically, the straight optical unit 2 includes a straight single-mode optical fiber 201, a straight multimode optical fiber 202 and a straight continuous grating optical fiber 203, wherein the straight single-mode optical fiber 201 is connected to the signal input end of an external DAS signal input module, the straight multimode optical fiber 202 is connected to the signal input end of an external DTS signal input module, and the straight continuous grating optical fiber 203 is connected to the signal input end of an external DPS signal input module, wherein the straight single-mode optical fiber 201, the straight multimode optical fiber 202 and the straight continuous grating optical fiber 203 are all made of high-temperature resistant and hydrogen-damage-resistant optical fiber. By making the straight single-mode optical fiber 201, the straight multimode optical fiber 202 and the straight continuous grating optical fiber 203 all of them are made of high-temperature resistant and hydrogen-damage-resistant optical fiber, their reliability and service life are improved, and the straight continuous grating optical fiber 203 can also be a straight microstructure optical fiber.

[0025] Specifically, a straight single-mode strain optical fiber is arranged inside the straight strain optical unit 3, and the straight single-mode strain optical fiber is connected to the signal input end of the DSS signal input module. The straight single-mode strain optical fiber arranged on the outer side wall of the continuous tubing body can monitor the DSS signals on both sides of the continuous tubing body in real time.

[0026] Specifically, the straight single-mode strain optical fiber is made by extruding a high-temperature resistant and high-strength flexible composite material on the outer wall of the straight single-mode optical fiber 201 and increasing the diameter of the straight single-mode optical fiber 201 to 1mm to 2mm, and then tightly wrapping it inside a stainless steel tube with an inner diameter of 1mm to 2mm. The straight single-mode strain optical fiber is used to sense the stress and strain outside the stainless steel tube. The straight single-mode strain optical fiber can sense the stress and strain outside the stainless steel tube.

[0027] Specifically, the coiled tubing unit 1 includes a coiled tubing body 101, and the outer side wall of the coiled tubing body 101 is evenly provided with a first card groove 102, a second card groove 103 and a third card groove 104. The coiled tubing body 101 has the functions of limiting the straight light unit 2, the straight strain light unit 3, the power supply control cable 4 and the hydraulic control pipeline 5 through the first card groove 102, the second card groove 103 and the third card groove 104.

[0028] Specifically, there are two first card slots 102, and the inner walls of the two first card slots 102 are respectively wedged with the outer walls of the straight light unit 2 and the straight strain light unit 3, and there are two second card slots 103, and the inner walls of the two second card slots 103 are wedged with the outer wall of the hydraulic control pipeline 5. The straight light unit 2 and the straight strain light unit 3 can be initially limited and protected by the first card slots 102.

[0029] Specifically, there are multiple third card slots 104 , and the inner walls of the multiple third card slots 104 are wedged with the outer walls of the power supply control cable 4 . The power supply control cable 4 can be initially limited and protected by the third card slots 104 .

[0030] Specifically, the straight light unit 2, the straight strain light unit 3, the hydraulic control pipeline 5 and the power supply control cable 4 are connected to the coiled tubing body 101 by inlay welding. The straight light unit 2, the straight strain light unit 3, the hydraulic control pipeline 5 and the power supply control cable 4 are connected to the coiled tubing body 101 by inlay welding, so that the connection effect is better, so that the design function of monitoring can be exerted for a long time.

[0031] When in use, firstly, during the drilling process, the straight single-mode strain optical fiber provided on the outer wall of the continuous tubing body 101 can monitor the DSS signals on both sides of the inside and outside of the continuous tubing body 101 in real time, and then the straight single-mode optical fiber 201, the straight multi-mode optical fiber 202 and the straight continuous grating optical fiber 203 provided on the outer wall of the continuous tubing body 101 can respectively monitor the DAS signals, DTS signals and DPS signals on both sides of the inside and outside of the continuous tubing body 101 in real time, effectively realizing that the continuous tubing assembly has the function of monitoring the DSS signals, DAS signals, DTS signals and DPS signals inside and outside the continuous tubing body 101 in real time during the drilling process, and the monitored signals can be output to the external composite modem in real time. The coiled tubing assembly has a simple structure and good monitoring effect. Then, the straight light unit 2 and the straight strain light unit 3 can monitor the fluid noise, temperature, pressure, stress and strain in the underground well section and inside and outside the drilling tool in real time during the drilling process, and then perform local damage prevention operations on the coiled tubing body 101, the external hydraulic guide and the external electric drill bit, which effectively realizes the function of the coiled tubing assembly to monitor the well section subjected to high stress of the coiled tubing body 101, the external hydraulic guide and the external electric drill bit in real time during the drilling process, prevents the coiled tubing body 101, the external hydraulic guide and the external electric drill bit from being locally damaged, ensures the safety of the drilling process, and improves the drilling efficiency.

[0032] The straight single-mode optical fiber 201, straight multi-mode optical fiber 202, straight continuous grating optical fiber 203 and straight single-mode strained optical fiber are all finished products produced using existing technologies and can be purchased on the market; the components are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0033] 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.

[0034] 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 coiled tubing assembly for a directional drilling system, comprising a coiled tubing unit (1), characterized in that: The outer wall of the coiled tubing unit (1) is provided with a straight light unit (2), a straight strain light unit (3), a power supply control cable (4) and a hydraulic control pipeline (5), and the outer wall of the coiled tubing unit (1) is also coated with a flexible composite layer (6), wherein the flexible composite layer (6) is used to further wrap and fix the straight light unit (2), the straight strain light unit (3), the power supply control cable (4) and the hydraulic control pipeline (5) with the coiled tubing unit (1), and the outer wall of the flexible composite layer (6) is sleeved with a stainless steel protective sleeve (7); The power supply control cable (4) is used to connect the external electric drill bit and the external power supply control module, and the hydraulic control pipeline (5) is used to connect the external hydraulic guide and the external control module; The straight light unit (2) and the straight strain light unit (3) are used to monitor the DAS signal, DTS signal, DPS signal and DSS signal inside and outside the coiled tubing unit (1) in real time during the drilling operation, and simultaneously monitor the status of the coiled tubing unit (1), the external hydraulic guide and the external electric drill bit during the drilling operation and the environmental changes inside and outside the wellbore.

2. The coiled tubing assembly for a directional drilling system according to claim 1, characterized in that: The straight optical unit (2) comprises a straight single-mode optical fiber (201), a straight multi-mode optical fiber (202) and a straight continuous grating optical fiber (203); the straight single-mode optical fiber (201) is connected to a signal input end of an external DAS signal input module, the straight multi-mode optical fiber (202) is connected to a signal input end of an external DTS signal input module, and the straight continuous grating optical fiber (203) is connected to a signal input end of an external DPS signal input module; the straight single-mode optical fiber (201), the straight multi-mode optical fiber (202) and the straight continuous grating optical fiber (203) are all made of high temperature resistant and hydrogen damage resistant optical fibers.

3. The coiled tubing assembly for a directional drilling system according to claim 2, characterized in that: A straight single-mode strain optical fiber is arranged inside the straight strain optical unit (3), and the straight single-mode strain optical fiber is connected to the signal input end of the DSS signal input module.

4. The coiled tubing assembly for a directional drilling system according to claim 3, characterized in that: The straight single-mode strain optical fiber is manufactured by extruding a high-temperature resistant and high-strength flexible composite material onto the outer wall of the straight single-mode optical fiber (201), increasing the diameter of the straight single-mode optical fiber (201) to 1 mm to 2 mm, and then tightly wrapping it inside a stainless steel tube with an inner diameter of 1 mm to 2 mm. The straight single-mode strain optical fiber is used to sense stress and strain outside the stainless steel tube.

5. The coiled tubing assembly for a directional drilling system according to claim 4, characterized in that: The coiled tubing unit (1) comprises a coiled tubing body (101), and the outer side wall of the coiled tubing body (101) is evenly provided with a first clamping groove (102), a second clamping groove (103) and a third clamping groove (104).

6. The coiled tubing assembly for a directional drilling system according to claim 5, characterized in that: The number of the first card slots (102) is two, and the inner side walls of the two first card slots (102) are respectively wedged with the outer side walls of the straight light unit (2) and the straight strain light unit (3); the number of the second card slots (103) is two, and the inner side walls of the two second card slots (103) are wedged with the outer side wall of the hydraulic control pipeline (5).

7. The coiled tubing assembly for a directional drilling system according to claim 6, characterized in that: There are multiple third card slots (104), and the inner side walls of the multiple third card slots (104) are wedged with the outer side walls of the power supply control cable (4).

8. The coiled tubing assembly for a directional drilling system according to claim 4, characterized in that: The straight optical unit (2), the straight strain optical unit (3), the hydraulic control pipeline (5), the power supply control cable (4) and the coiled tubing body (101) are all connected by inlay welding.

Images