An electronically controlled downhole bare optical fiber laying instrument, laying system and laying method

Abstract

The present invention provides an electrically controlled downhole bare fiber layout instrument, a layout system, and a layout method, wherein the bare fiber layout instrument includes: a measuring pup section, an electrically controlled transmission pup section, and a bare fiber release pup section, wherein the two ends of the electrically controlled transmission pup section are detachably connected to the measuring pup section and the bare fiber release pup section, respectively; wherein a fiber release head is provided at the bottom of the bare fiber release pup section, and the electrically controlled transmission pup section is used to push the fiber release head so that it pulls the bare fiber in the bare fiber release pup section for layout in the oil and gas well. The present invention can accurately layout the bare fiber to the downhole position and can improve the efficiency of downhole layout of the bare fiber; the present invention lays the bare fiber in the oil and gas well, and the bare fiber is directly in contact with the downhole environment through the bare fiber, thereby improving the measurement sensitivity and measurement accuracy; and the bare fiber layout instrument of the present invention is quickly sealed with the wellhead, which can quickly realize long-term monitoring of distributed optical fibers, and the long-term monitoring efficiency is higher.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber logging in oil field development, and in particular relates to an electrically controlled downhole bare optical fiber laying instrument, a laying system and a laying method. Background Art

[0002] Distributed fiber-optic logging technology uses optical fiber as both a transmission channel and a sensor. This single fiber can monitor temperature and acoustic vibrations at various locations within the well in real time. The fiber doesn't need to be moved during logging, nor does it interfere with the dynamic downhole environment, making logging more efficient and accurate. Combined with the widespread application of long-term fiber-optic monitoring technology, this technology can provide clients with more intelligent technical services, including wellsite monitoring, wellbore integrity testing, fracturing effectiveness monitoring, and injection rate monitoring, offering enhanced solutions for the development of digital oilfields.

[0003] Conventional fiber-optic logging construction involves reeling an armored logging cable onto a logging winch drum and lowering it into the well. This process requires a winch, overhead pulleys, and associated wellhead blowout prevention equipment. Furthermore, armored logging cables require encasing the bare optical fiber in a thin steel tube, which is then reinforced with steel wire and other materials as needed. This not only increases the cost of manufacturing the cable, but also prevents the optical fiber from directly contacting the wellbore environment, resulting in reduced measurement accuracy and sensitivity, and inability to measure distributed stress. Summary of the Invention

[0004] In response to the above problems, the present invention provides an electrically controlled downhole bare optical fiber layout instrument, a layout system and a layout method, which realize the rapid and accurate downhole layout of bare optical fibers, overcoming the current shortcomings of high downhole cost of optical cables, long optical cable production cycle and poor sensing capability.

[0005] The present invention provides an electrically controlled downhole bare fiber laying instrument, comprising: a measuring pup section, an electrically controlled transmission pup section and a bare fiber release pup section, wherein the two ends of the electrically controlled transmission pup section are detachably connected to the measuring pup section and the bare fiber release pup section respectively; wherein, a fiber release head is provided at the bottom of the bare fiber release pup section, and the electrically controlled transmission pup section is used to push the fiber release head so that the head pulls the bare fiber in the bare fiber release pup section for laying in an oil and gas well.

[0006] Furthermore, the measuring sub includes a first shell, a head and a comprehensive measuring part;

[0007] The upper end of the first shell is detachably connected to the sealing head, a first accommodating cavity is provided in the first shell, and the integrated measuring part is connected to the sealing head and is provided in the first accommodating cavity.

[0008] Furthermore, the comprehensive measurement unit includes a temperature measuring instrument, a pressure measuring instrument, a gamma detector and a magnetic positioning measuring instrument.

[0009] Furthermore, the electric-controlled transmission sub includes a second housing, a transmission motor, a transmission rod and a bare optical fiber sealing head;

[0010] Particularly, a second accommodating cavity and a third accommodating cavity are provided in the second shell body, the transmission motor is provided in the third accommodating cavity, the transmission motor is fixed on the step surface formed by the second accommodating cavity and the third accommodating cavity, the upper end of the transmission rod is detachably connected to the transmission motor, a fourth accommodating cavity is provided in the middle of the transmission rod, and the bare optical fiber sealing head is provided at the upper end of the fourth accommodating cavity.

[0011] Furthermore, the bare fiber release sub further includes a third housing, a wellhead sealing portion, a bare fiber winding frame and a shear pin;

[0012] The upper end of the third shell is detachably connected to the lower end of the wellhead sealing portion. A fifth accommodating cavity is provided inside the third shell. The bare optical fiber winding rack is provided in the fifth accommodating cavity. The bare optical fiber winding rack can slide up and down in the fifth accommodating cavity. The optical fiber release head is provided at the lower end of the third shell, and the optical fiber release head is connected to the third shell through the shear pin.

[0013] Furthermore, grooves are provided on both sides of the wellhead sealing portion, a sixth accommodating cavity is provided in the middle of the wellhead sealing portion, and a sealing O-ring is further provided at the lower end of the sixth accommodating cavity.

[0014] Furthermore, through holes are provided on both sides of the bottom of the third shell, and blind holes are provided on both sides of the optical fiber release head. One end of the shear pin passes through the through holes and cooperates with the blind holes to fix the optical fiber release head to the bottom of the third shell.

[0015] The present invention also provides an electrically controlled downhole bare optical fiber laying system, comprising:

[0016] The bare optical fiber placement instrument is used to place the bare optical fiber in the well according to the instruction of the logging vehicle;

[0017] The logging vehicle is used to send instructions to the bare optical fiber layout instrument;

[0018] a cable for controlling communication and data transmission between the bare optical fiber layout instrument and the logging vehicle;

[0019] A blowout preventer and blowout prevention wellhead equipment are used to seal the bare optical fiber layout instrument with the wellhead.

[0020] The present invention also provides an electrically controlled downhole bare optical fiber deployment method, comprising the following steps:

[0021] Controlling the bare optical fiber laying instrument to lay bare optical fibers in the well by using a logging vehicle, wherein the bare optical fiber laying instrument is connected to the logging vehicle via a cable;

[0022] The bare optical fiber deployment instrument is sealed from the wellhead by a blowout preventer and a blowout prevention wellhead device, wherein the blowout preventer and the blowout prevention wellhead device are arranged at the wellhead.

[0023] Furthermore, controlling the bare optical fiber laying instrument by the logging vehicle to lay the bare optical fiber in the well includes the following steps:

[0024] Lower the bare fiber layout instrument to the bottom of the well via the logging vehicle;

[0025] The bare optical fiber layout instrument is controlled by the logging vehicle to release the optical fiber release head;

[0026] The bare fiber optic layout instrument is lifted up, and the logging vehicle completes the temperature, pressure, magnetic positioning and gamma measurements through the bare fiber optic layout instrument, and then the bare fiber optic layout instrument is lifted to the wellhead.

[0027] Furthermore, sealing the bare optical fiber deployment instrument from the wellhead via the blowout preventer includes the following steps:

[0028] After the logging truck determines through the magnetic positioning signal that the wellhead seal on the bare optical fiber layout instrument and the blowout preventer are in the same position, the blowout preventer is closed.

[0029] Furthermore, the electrically controlled downhole bare optical fiber deployment method further includes the following steps:

[0030] After verifying that the blowout preventer is effective, dismantle the blowout preventer wellhead equipment and remove the measuring nipple at the upper end of the bare optical fiber layout instrument.

[0031] The beneficial effects of the present invention are as follows: the present invention can accurately lay out the bare optical fiber to the downhole position and improve the efficiency of the downhole laying of the bare optical fiber; the present invention lays out the bare optical fiber in the oil and gas well, and the bare optical fiber is in direct contact with the downhole environment, thereby improving the measurement sensitivity and measurement accuracy; and the bare optical fiber layout instrument of the present invention is quickly sealed with the wellhead, which can quickly realize long-term monitoring of distributed optical fibers, and the long-term monitoring efficiency is higher.

[0032] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic structural diagram of an electrically controlled downhole bare optical fiber laying instrument according to an embodiment of the present invention is shown;

[0035] Figure 2 A schematic diagram of the installation of an electric-controlled transmission sub and a bare fiber release sub according to an embodiment of the present invention is shown;

[0036] Figure 3 A schematic structural diagram of a wellhead sealing portion according to an embodiment of the present invention is shown;

[0037] Figure 4 shows a schematic diagram of the installation of a third housing and an optical fiber release head according to an embodiment of the present invention;

[0038] Figure 5 A schematic structural diagram of an electrically controlled downhole bare optical fiber deployment system according to an embodiment of the present invention is shown;

[0039] Figure 6 A schematic flow chart of an electrically controlled downhole bare optical fiber deployment method according to an embodiment of the present invention is shown.

[0040] In the figure: 1, bare fiber layout instrument; 11, measuring short section; 12, electric control transmission short section; 13, bare fiber release short section; 111, first shell; 112, first accommodating chamber; 113, head; 114, integrated measurement unit; 121, second shell; 122, second accommodating chamber; 123, third accommodating chamber; 124, transmission motor; 125, transmission rod; 126, bare fiber sealing head; 127, fourth accommodating chamber; 131, the Three shells; 132, optical fiber release head; 133, wellhead sealing part; 134, bare optical fiber winding frame; 135, bare optical fiber; 136, shear pin; 1311, fifth accommodating chamber; 1312, through hole; 1321, blind hole; 1322, optical fiber temperature and pressure probe; 1331, groove; 1332, sixth accommodating chamber; 1333, sealing O-ring; 1341, threaded hole; 2, blowout preventer; 3, logging vehicle; 4, cable. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0042] It should be noted that directional terms such as "upper, lower, left, and right" used in the embodiments of the present invention generally refer to the directions shown in the accompanying drawings. Similarly, for ease of understanding and description, "inner" and "outer" refer to the inside and outside relative to the outline of each component itself. The terms "first," "second," and "third" are used for descriptive purposes only.

[0043] Aiming at the shortcomings of high optical cable production cost, long production cycle, poor sensing capability of armored optical cable, and complex well logging construction, the present invention proposes an electrically controlled downhole bare optical fiber laying instrument.

[0044] See also Figure 1 , Figure 1 A schematic structural diagram of an electrically controlled downhole bare optical fiber laying instrument according to an embodiment of the present invention is shown.

[0045] An electrically controlled downhole bare fiber layout instrument includes: a measuring pup section 11, an electrically controlled transmission pup section 12, and a bare fiber release pup section 13. The two ends of the electrically controlled transmission pup section 12 are detachably connected to the measuring pup section 11 and the bare fiber release pup section 13, respectively. A fiber release head 132 is provided at the bottom of the bare fiber release pup section 13. The electrically controlled transmission pup section 12 is used to push the fiber release head 132, causing it to pull the bare fiber 135 in the bare fiber release pup section 13 for layout in the oil and gas well.

[0046] The bare fiber deployment instrument 1 of the present invention enables rapid downhole deployment of bare fiber 135. The measurement sub 11 accurately locates the deployment depth of bare fiber 135. Because bare fiber 135 is in direct contact with the downhole environment, it offers enhanced sensitivity. Furthermore, the use of bare fiber 135 reduces cable armoring costs, significantly lowering well logging costs and facilitating the rapid deployment of distributed fiber optics.

[0047] Specifically, the measurement sub 11 is used to calibrate the depth and obtain key parameters for distributed optical fiber interpretation and evaluation.

[0048] Specifically, the measuring sub 11 includes a first shell 111, a head 113 and an integrated measuring part 114. The upper end of the first shell 111 is detachably connected to the head 113. A first accommodating cavity 112 is provided in the first shell 111. The integrated measuring part 114 is connected to the head 113 and is provided in the first accommodating cavity 112.

[0049] Furthermore, the integrated measuring unit 114 includes a temperature measuring instrument, a pressure measuring instrument, a gamma detector, and a magnetic positioning measuring instrument.

[0050] It should be noted that the gamma detector inside the measuring sub 11 measures the gamma photon count rate of the formation behind the casing through a built-in counter tube, and compares it with the deeper gamma of the open hole for accurate depth measurement; the magnetic positioning measuring instrument CCL can be used to assist in depth measurement or to measure depth independently; the measurement results of the temperature measuring instrument are used to perform temperature correction on the distributed fiber optic temperature measurement system (DTS).

[0051] See also Figure 2 , Figure 2 A schematic diagram of the installation of an electrically controlled transmission sub and a bare fiber release sub according to an embodiment of the present invention is shown.

[0052] Specifically, the electrically controlled transmission short section 12 includes a second shell 121, a transmission motor 124, a transmission rod 125 and a bare fiber sealing head 126. The upper end of the second shell 121 is detachably connected to the lower end of the first shell 111. A second accommodating chamber 122 and a third accommodating chamber 123 are provided in the second shell 121. The transmission motor 124 is provided in the third accommodating chamber 123 and is fixed on the step surface formed by the second accommodating chamber 122 and the third accommodating chamber 123. The upper end of the transmission rod 125 is detachably connected to the transmission motor 124. A fourth accommodating chamber 127 is provided in the middle of the transmission rod 125. The upper end of the fourth accommodating chamber 127 is provided with a bare fiber sealing head 126.

[0053] For example, the upper end of the second shell 121 and the lower end of the first shell 111 can be connected by threads to achieve a detachable connection.

[0054] For example, the transmission rod 125 and the transmission motor 124 can be detachably connected by means of threads, keys, etc.

[0055] Specifically, such as Figure 2 As shown, the bare fiber release short section 13 also includes a third shell 131, a wellhead sealing portion 133, a bare fiber winding frame 134 and a shear pin 136. The upper end of the third shell 131 is detachably connected to the lower end of the wellhead sealing portion 133, and the upper end of the wellhead sealing portion 133 is detachably connected to the second shell 121. A fifth accommodating cavity 1311 is provided inside the third shell 131, and a bare fiber winding frame 134 is provided in the fifth accommodating cavity 1311. The bare fiber winding frame 134 can slide up and down in the fifth accommodating cavity 1311. The optical fiber release head 132 is provided at the lower end of the third shell 131, and the optical fiber release head 132 is connected to the third shell 131 through the shear pin 136.

[0056] It should be noted that one end of the bare fiber 135 passes through the fourth accommodating cavity 127 and the bare fiber sealing head 126. A high-temperature-resistant rubber pad with a through hole is installed inside the bare fiber sealing head 126. The bare fiber 135 passes through the through hole of the high-temperature-resistant rubber pad, which is squeezed to achieve a seal, making it suitable for pressure-sensitive operations. The drive motor 124 is used to push the fiber release head 132 via the drive rod 125 to shear the shear pin 136, thereby releasing the fiber release head 132. The bare fiber winding frame 134 is used to wind the bare fiber 135, allowing the bare fiber 135 to be smoothly released during the lifting of the bare fiber layout instrument 1.

[0057] For example, the detachable connection between the wellhead sealing portion 133 and the second shell 121 and the third shell 131 can be achieved through threaded connection.

[0058] See also Figure 3 , Figure 3 A schematic structural diagram of a wellhead sealing portion according to an embodiment of the present invention is shown.

[0059] Furthermore, grooves 1331 are provided on both sides of the wellhead sealing part 133, a sixth accommodating cavity 1332 is provided in the middle of the wellhead sealing part 133, the transmission rod 125 passes through the sixth accommodating cavity 1332 and is connected to the bare optical fiber winding frame 134, and a sealing O-ring 1333 is also provided at the lower end of the sixth accommodating cavity 1332.

[0060] See also Figure 4 , Figure 4 A schematic diagram of the installation of a third housing and an optical fiber releasing head according to an embodiment of the present invention is shown.

[0061] Furthermore, through holes 1312 are provided on both sides of the bottom of the third shell 131, and blind holes 1321 are provided on both sides of the optical fiber release head 132. One end of the shear pin 136 passes through the through hole 1312 on the third shell 131 and cooperates with the blind hole 1321 of the optical fiber release head 132 to fix the optical fiber release head 132 to the bottom of the third shell 131.

[0062] Preferably, the optical fiber release head 132 is made of a soluble metal material, and an optical fiber temperature and pressure probe 1322 is installed inside the optical fiber release head 132 , through which the bottom hole pressure and temperature values can be obtained.

[0063] It should be noted that one end of the bare optical fiber 135 wound on the bare optical fiber winding frame 134 passes through the bare optical fiber sealing head 126 to reach the third accommodating cavity 123, and the other end is connected to the optical fiber temperature and pressure probe 1322 in the middle of the optical fiber release head 132.

[0064] Furthermore, a threaded hole 1341 is provided at the upper end of the bare optical fiber winding frame 134 , and is detachably connected to the lower end of the transmission rod 125 through the threaded hole 1341 .

[0065] During implementation, the lowering depth of the bare fiber deployment instrument 1 is monitored using a gamma detector and a magnetic positioning meter. Once the bare fiber deployment instrument 1 is lowered to the wellbore, the drive motor 124 is controlled to push the bare fiber winding frame 134. The bare fiber winding frame 134 slides downward within the fifth accommodating chamber 1311, contacting the fiber release head 132 and severing the shear pin 136. The fiber temperature and pressure probe 1322 in the center of the fiber release head 132 is connected to the bare fiber 135. Due to its own weight, the fiber release head 132 pulls the bare fiber 135 down to the wellbore. The bare fiber 135 is wound on the bare fiber winding frame 134. As the bare fiber deployment instrument 1 is raised, the weight of the fiber release head 132 continuously pulls the bare fiber 135 from the bare fiber release sub 13, thereby enabling the deployment of the bare fiber 135 in the wellbore.

[0066] A wellhead seal 133 is located near the top of the bare fiber release sub 13. Once the bare fiber deployment device 1 reaches the wellhead, the wellhead seal is closed, and a sealing valve seals the bare fiber deployment device 1 at the wellhead seal 133. The bare fiber 135 is sealed at the upper end of the bare fiber release sub 13 via a bare fiber sealing head 126.

[0067] When the bare fiber laying instrument 1 reaches the surface, the measuring sub 11 can be removed, and the bare fiber 135 led out from the bare fiber sealing head 126 can be used to implement fiber optic logging.

[0068] See also Figure 5 , Figure 5 A schematic structural diagram of an electrically controlled downhole bare optical fiber deployment system according to an embodiment of the present invention is shown.

[0069] Furthermore, the embodiment of the present invention requires the use of a bare optical fiber deployment instrument 1, a blowout preventer 2, blowout prevention wellhead equipment, a logging vehicle 3 and a cable 4 to achieve the deployment of the bare optical fiber 135 in the oil and gas well.

[0070] Based on this, an embodiment of the present invention further provides an electrically controlled downhole bare optical fiber deployment system, comprising:

[0071] The logging vehicle 3 is used to send instructions to the bare optical fiber layout instrument 1.

[0072] The cable 4 is used for communication and data transmission between the bare optical fiber layout instrument 1 and the logging vehicle 3.

[0073] The bare optical fiber laying instrument 1 is used to lay the bare optical fiber 135 in the well according to the instruction of the logging vehicle 3.

[0074] BOP 2, blowout prevention wellhead equipment, used to seal the bare optical fiber layout instrument 1 from the wellhead.

[0075] See also Figure 6 , Figure 6 A schematic flow chart of an electrically controlled downhole bare optical fiber deployment method according to an embodiment of the present invention is shown.

[0076] Furthermore, an embodiment of the present invention also provides an electrically controlled downhole bare optical fiber deployment method, comprising the following steps:

[0077] The bare optical fiber laying instrument 1 is controlled by the logging vehicle 3 to lay the bare optical fiber 135 in the well, wherein the bare optical fiber laying instrument 1 is connected to the logging vehicle 3 via a cable 4 .

[0078] The bare optical fiber deployment instrument 1 is sealed from the wellhead by the blowout preventer 2 and the blowout prevention wellhead equipment, wherein the blowout preventer 2 and the blowout prevention wellhead equipment are arranged at the wellhead.

[0079] Furthermore, controlling the bare optical fiber laying instrument 1 by the logging vehicle 3 to lay the bare optical fiber 135 in the well includes the following steps:

[0080] S11. Lower the bare optical fiber layout instrument 1 to the bottom of the well via the logging vehicle 3.

[0081] S12 , controlling the bare optical fiber deployment instrument 1 to release the optical fiber release head 132 through the logging vehicle 3 .

[0082] S13 , lifting the bare optical fiber layout instrument 1 , the logging vehicle 3 completes the temperature, pressure, magnetic positioning and gamma measurement through the bare optical fiber layout instrument 1 , and then lifts the bare optical fiber layout instrument 1 to the wellhead.

[0083] Furthermore, sealing the bare optical fiber deployment instrument 1 from the wellhead via the blowout preventer 2 includes the following steps:

[0084] After the logging vehicle 3 determines through the magnetic positioning signal that the wellhead sealing portion 133 on the bare optical fiber layout instrument 1 and the blowout preventer 2 are located at the same position, the blowout preventer 2 is closed.

[0085] Furthermore, the electrically controlled downhole bare optical fiber deployment method further includes the following steps:

[0086] After verifying that the blowout preventer 2 is effective, the blowout prevention wellhead equipment is dismantled and the measuring short section 11 on the upper end of the bare optical fiber layout instrument 1 is removed.

[0087] It should be noted that the bare optical fiber 135 of the embodiment of the present invention is used for distributed optical fiber measurement, and the wellhead sealing part 133 seals the bare optical fiber layout instrument 1 and the wellhead by interacting with the blowout preventer 2, thereby ensuring that the bare optical fiber 135 can operate under pressure.

[0088] During cased well pressurization operations, after the bare fiber optic layout instrument 1 is connected and tested, the blowout preventer 2 and blowout prevention wellhead equipment are installed. The bare fiber optic layout instrument 1 is lowered to the wellbore according to the pressurized operation process. The drive motor 124 is activated, pushing the drive rod 125 to shear the shear pin 136, releasing the fiber release head 132. The logging vehicle 3 activates the data acquisition system, raises the bare fiber optic layout instrument 1, completes temperature, pressure, magnetic positioning, and gamma measurements, and then raises the bare fiber optic layout instrument 1 to the wellhead. After confirming the magnetic positioning signal that the wellhead seal 133 on the bare fiber optic layout instrument 1 is in the same position as the blowout preventer 2, the blowout preventer 2 is closed. After verifying that the blowout prevention function of the blowout preventer 2 is effective, the blowout prevention wellhead equipment is dismantled, and the measuring nipple 11 on the bare fiber optic layout instrument 1 is removed. The bare fiber 135 connector on the bare fiber sealing head 126 is exposed. By fusion splicing the bare fiber 135, it is connected to the distributed fiber optic monitoring surface, thus achieving distributed fiber optic long-term monitoring.

[0089] The electrically controlled downhole bare optical fiber laying instrument 1 and optical cable logging according to the embodiment of the present invention have the following advantages:

[0090] The embodiment of the present invention uses cable 4 to hang the downhole bare optical fiber layout instrument 1 to achieve rapid downhole layout of the bare optical fiber 135. The downhole magnetic positioning and gamma instruments can accurately locate the layout depth of the bare optical fiber 135. By hanging the downhole crawler through cable 4, the layout of the horizontal well bare optical fiber can be accurately achieved.

[0091] The use of bare fiber 135 for measurement, which is in direct contact with the downhole environment, improves measurement sensitivity and accuracy. It also significantly reduces construction time and logging costs.

[0092] In the embodiment of the present invention, after the bare optical fiber layout instrument 1 reaches the wellhead, closing the wellhead valve can remove the wellhead blowout prevention equipment and lifting equipment, and can quickly realize distributed optical fiber long-term monitoring, which has higher long-term monitoring efficiency.

[0093] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrically controlled downhole bare optical fiber laying instrument, characterized in that: include: A measuring pup section, an electric-controlled transmission pup section, and a bare fiber release pup section, wherein both ends of the electric-controlled transmission pup section are detachably connected to the measuring pup section and the bare fiber release pup section respectively; The bottom of the bare fiber release sub is provided with a fiber release head, and the electric-controlled transmission sub is used to push the fiber release head so that the fiber release head pulls the bare fiber in the bare fiber release sub to be laid in the oil and gas well. The measuring sub includes a comprehensive measuring section, which includes a temperature measuring instrument, a pressure measuring instrument, a gamma detector and a magnetic positioning measuring instrument; The bare fiber release sub also includes a third shell, a wellhead sealing portion, a bare fiber winding frame and a shear pin; the upper end of the third shell is detachably connected to the lower end of the wellhead sealing portion, a fifth accommodating chamber is provided inside the third shell, the bare fiber winding frame is provided in the fifth accommodating chamber, and the bare fiber winding frame can slide up and down in the fifth accommodating chamber, the optical fiber release head is provided at the lower end of the third shell, and the optical fiber release head is connected to the third shell through the shear pin; by pushing the bare fiber winding frame to slide downward in the fifth accommodating chamber and contacting the optical fiber release head, the shear pin will be cut off; the optical fiber temperature and pressure probe in the middle of the optical fiber release head is connected to the bare optical fiber, and due to its own weight, the optical fiber release head will pull the bare optical fiber to the bottom of the well.

2. The electrically controlled downhole bare optical fiber laying instrument according to claim 1, characterized in that: The measuring nipple further includes a first shell and a head; The upper end of the first shell is detachably connected to the sealing head, a first accommodating cavity is provided in the first shell, and the integrated measuring part is connected to the sealing head and is provided in the first accommodating cavity.

3. The electrically controlled downhole bare optical fiber laying instrument according to claim 1 or 2, characterized in that: The electric-controlled transmission sub includes a second housing, a transmission motor, a transmission rod and a bare optical fiber sealing head; Particularly, a second accommodating cavity and a third accommodating cavity are provided in the second shell body, the transmission motor is provided in the third accommodating cavity, the transmission motor is fixed on the step surface formed by the second accommodating cavity and the third accommodating cavity, the upper end of the transmission rod is detachably connected to the transmission motor, a fourth accommodating cavity is provided in the middle of the transmission rod, and the bare optical fiber sealing head is provided at the upper end of the fourth accommodating cavity.

4. The electrically controlled downhole bare optical fiber laying instrument according to claim 1, characterized in that: Grooves are provided on both sides of the wellhead sealing portion, a sixth accommodating cavity is provided in the middle of the wellhead sealing portion, and a sealing O-ring is further provided at the lower end of the sixth accommodating cavity.

5. The electrically controlled downhole bare optical fiber laying instrument according to claim 1, characterized in that: Through holes are provided on both sides of the bottom of the third shell, and blind holes are provided on both sides of the optical fiber release head. One end of the shear pin passes through the through holes and cooperates with the blind holes to fix the optical fiber release head to the bottom of the third shell.

6. An electrically controlled downhole bare optical fiber deployment system, characterized in that: include: The bare optical fiber laying instrument according to any one of claims 1 to 5, used to lay bare optical fibers in a well according to instructions from a logging vehicle; The logging vehicle is used to send instructions to the bare optical fiber layout instrument; a cable for controlling communication and data transmission between the bare optical fiber layout instrument and the logging vehicle; A blowout preventer and blowout prevention wellhead equipment are used to seal the bare optical fiber layout instrument with the wellhead.

7. A method for laying downhole bare optical fiber electrically controlled, characterized in that: The following steps are involved: The bare optical fiber laying instrument according to any one of claims 1 to 5 is controlled by a logging vehicle to lay the bare optical fiber in the well, wherein the bare optical fiber laying instrument is connected to the logging vehicle via a cable; The bare optical fiber deployment instrument is sealed from the wellhead by a blowout preventer and a blowout prevention wellhead device, wherein the blowout preventer and the blowout prevention wellhead device are arranged at the wellhead.

8. The electrically controlled downhole bare optical fiber laying method according to claim 7, characterized in that: The process of laying bare optical fiber in a well by controlling a bare optical fiber laying instrument on a logging vehicle includes the following steps: Lower the bare fiber layout instrument to the bottom of the well via the logging vehicle; The bare optical fiber layout instrument is controlled by the logging vehicle to release the optical fiber release head; The bare fiber optic layout instrument is lifted up, and the logging vehicle completes the temperature, pressure, magnetic positioning and gamma measurements through the bare fiber optic layout instrument, and then the bare fiber optic layout instrument is lifted to the wellhead.

9. The electrically controlled downhole bare optical fiber laying method according to claim 7, characterized in that: Sealing the bare fiber deployment tool from the wellhead via the blowout preventer includes the following steps: After the logging truck determines through the magnetic positioning signal that the wellhead seal on the bare optical fiber layout instrument and the blowout preventer are in the same position, the blowout preventer is closed.

10. The electrically controlled downhole bare optical fiber laying method according to any one of claims 7 to 9, characterized in that: The electrically controlled downhole bare optical fiber laying method further comprises the following steps: After verifying that the blowout preventer is effective, dismantle the blowout preventer wellhead equipment and remove the measuring nipple at the upper end of the bare optical fiber layout instrument.

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