Cable centralizer and system for preventing cable from being adsorbed and clamped in logging operation
By designing cable straightener and vibration device, the problem of cable adsorption card in the well wall is solved, ensuring smooth cable drop and logging instrument reach the depth, realizing the isolation between the cable and the well wall and mud diversion, and improving well logging Efficiency of the work.
Patent Information
- Application Number
- CN202411283353.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2024-12-27
AI Technical Summary
In cable logging operations, the cable is easily stuck or fixed due to the adsorption of the well wall, resulting in the inability to be smoothly lowered or lifted, affecting the logging instrument to reach the required well depth position.
Design a cable straightener, which is fixed to the cable by enclosing and tightening, adopts a spindle-shaped structure and mud guide groove to isolate the cable from the well wall, combines the clamping structure of the upper joint and the cone block to ensure that the cable is away from the well wall, and Improve mud passability through the cable vibration device.
Effectively eliminate the adsorption force of the well wall on the cable, ensure the smoothness of cable lay-down, enable the logging instrument to reach the required well depth position smoothly, and improve the cable's passing and installation capabilities downhole.
Smart Images
Figure CN119195664A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of cable logging operations, and in particular relates to a cable centralizer and a system for preventing cable adsorption and jamming in logging operations. Background Art
[0002] Cable logging operation refers to a technical activity in which a cable is used to lower a logging instrument into a well in the process of oil and gas exploration and production to obtain physical property data of the formation. In the process of lowering the cable into the well, the cable adsorption problem is prone to occur. In the logging industry, cable adsorption refers to the phenomenon that the cable is stuck or fixed in the well due to the adsorption of the well wall, thereby affecting the lowering or lifting of the cable, resulting in the logging instrument connected to the cable being unable to reach the required well depth or the instrument being unable to be lifted out of the well. Summary of the invention
[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a cable straightener and system for preventing cable adsorption and jamming in well logging operations. By arranging a cable straightener on the cable, the cable is isolated from the well wall, thereby eliminating the adsorption force of the well wall on the cable in the well, and solving the problem of cable adsorption and jamming in well logging operations.
[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a cable centralizer for preventing cable adsorption and jamming in well logging operations, comprising a cable centralizer, wherein the cable centralizer is fixed on the cable in a surrounding and clamping manner, and the cable located underground is isolated from the well wall by the cable centralizer, so as to eliminate the adsorption force exerted on the cable underground by the drilling fluid leaking into the well wall.
[0005] Furthermore, the structural part of the cable centralizer that impacts the downhole mud is spindle-shaped, and in the axial upward direction of the cable centralizer, the outer circumferential contour of the spindle-shaped structural part is the outer boundary of the cable centralizer.
[0006] Furthermore, mud guide grooves are distributed in an array on the outer circumferential surface of the cable centralizer, and the cable centralizer improves mud passability through the mud guide grooves.
[0007] Furthermore, the cable straightener comprises a main body, a cone block and an upper joint; the main body has an inner cavity adapted to the cone block; the upper joint extends into the inner cavity to press the cone block so that the cone block exerts a clamping force on the cable; the cone block converts the axial pressure applied by the upper joint into a radial clamping force to hold the cable; the main body, the cone block and the upper joint are relatively fixed to form the cable straightener fixed on the cable, and the cable straightener keeps the cable away from the well wall through the radial isolation of the main body.
[0008] Furthermore, the main body is composed of two symmetrical body halves, and a slide groove embedding structure and a positioning bead are arranged at the joint of the two body halves; the two body halves slide in the axial direction through the slide groove embedding structure, slide until the positioning bead pops up to locate and eliminate the gap between the two body halves, forming a body with an inner cavity inside and a spindle-shaped appearance, and the mud guide grooves are distributed in a circular array on the outer circumferential surface of the body.
[0009] Furthermore, the tail of the upper connector has a slot; the cone block is composed of two symmetrical cone halves spliced together, and the two cone halves are spliced together to form a clamping ring that matches the slot at the top, and the cone block is connected to the tail of the upper connector through the clamping fit between the clamping ring and the slot; when the upper connector is axially screwed into the body, the cone block is axially pressed downward to be embedded in the inner cavity of the body, so as to form a radial clamping force on the cone block through the axial compression of the upper connector and the radial constraint of the inner cavity, and the cone block holds the cable tightly through the radial clamping force.
[0010] Furthermore, the upper connector is composed of two symmetrical upper connector halves, and a positioning pin is provided at the joint of the two upper connector halves. The two upper connector halves are positioned and spliced through pins and holes to form the upper connector that can move on the cable, and the tail of the upper connector is threadedly connected to the head of the body.
[0011] Furthermore, the cable centralizer is installed on the cable located underground, and a plurality of the cable centralizers are arranged at intervals on the cable.
[0012] A system for preventing cable from being stuck during well logging operations, characterized in that: the system includes the cable centralizer; the system also includes a cable winch located on the wellhead side and a cable vibrator located above the wellhead; when the cable winch releases the cable, the cable vibrator drives the cable and the cable centralizer thereon to vibrate.
[0013] Furthermore, the cable vibration device includes an elastic support, a cable guide and a vibrator; the cable guide is arranged at the wellhead through the elastic support, the cable passes through the cable guide and extends into the well, and the vibrator is installed on the elastic support.
[0014] Beneficial effect: The present invention isolates the cable from the well wall by arranging a cable straightener on the cable, thereby eliminating the adsorption force of the well wall on the cable in the well, avoiding the cable being stuck or fixed in the well due to the adsorption of the well wall, so as to solve the problem of cable adsorption and jamming in well logging operations, ensure the smoothness of the cable being lowered into the well, and enable the well logging instrument to smoothly reach the required well depth position for survey. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1It is a half-section structural schematic diagram of a cable centralizer;
[0016] Figure 2 for Figure 1 Schematic diagram of the cutaway structure along section line AA;
[0017] Figure 3 for Figure 1 A schematic diagram of the cutaway structure along section line BB;
[0018] Figure 4 The schematic diagram of the structure of the system for preventing the cable from being adsorbed in well logging operations is shown in FIG. DETAILED DESCRIPTION
[0019] The present invention will be further described below in conjunction with the accompanying drawings.
[0020] like Figure 1 and Figure 4 As shown, a cable straightener for preventing cable adsorption and jamming in logging operations includes a cable straightener 1, wherein the cable straightener 1 is fixed on the cable 2 in a surrounding and embracing manner, and the cable 2 located in the well is separated from the well wall by the cable straightener 1, so as to eliminate the adsorption force of the drilling fluid leaking into the well wall on the cable in the well. The present invention isolates the cable 2 from the well wall of the well 8 by arranging the cable straightener 1 on the cable 2, thereby eliminating the adsorption force of the well wall on the cable 2 in the well, and preventing the cable 2 from being stuck or fixed in the well due to the adsorption effect of the well wall, so as to solve the problem of cable adsorption and jamming in logging operations, ensure the smoothness of the cable being lowered into the well, and enable the logging instrument 9 to smoothly reach the well depth position required for survey.
[0021] In order to improve the passability of the cable centralizer 1, the present invention adopts the following two measures:
[0022] The first measure is that the structure part of the cable centralizer 1 that impacts the downhole mud is spindle-shaped, and in the axial upward direction of the cable centralizer 1, the outer circumferential contour of the spindle-shaped structure part is the outer boundary of the cable centralizer 1.
[0023] The second measure: mud guide grooves 10 are distributed in an array on the outer circumferential surface of the cable centralizer 1 , and the cable centralizer 1 improves mud passability through the mud guide grooves 10 .
[0024] In the above measures, the spindle-shaped structure design of the cable centralizer 1 and the opening of the mud guide groove 10 on the outer surface can improve the passability and reduce the risk of the cable centralizer 1 itself getting stuck.
[0025] like Figure 1As shown, the cable straightener 1 includes a body 3, a cone block 4 and an upper joint 5; the body 3 has an inner cavity 30 adapted to the cone block 4; the upper joint 5 extends into the inner cavity 30 to press the cone block 4, so that the cone block 4 generates a clamping force on the cable 2; the cone block 4 converts the axial pressure applied by the upper joint 5 into a radial clamping force to hold the cable 2; the body 3, the cone block 4 and the upper joint 5 are relatively fixed to form the cable straightener 1 fixed on the cable 1, and the cable straightener 1 keeps the cable 1 away from the well wall through the radial isolation of the body 3. In the cable straightener 1, the upper joint 5 is used to press the cone block 4, thereby generating a clamping force on the cable 2; the body 3 can withstand a large radial force and provide an installation space for the cone block 4, and the body 3 keeps the cable 2 away from the well wall through a large outer diameter; the cone block 4 holds the cable 2 to prevent the cable straightener 1 from sliding on the cable 2.
[0026] The cable straightener 1 of the present invention is suitable for cables with a specification of 5.6-13.2 mm. The material of the body 3 is 17-4PH, the material of the cone block 4 is 42CrMo, the clamping force of the cone block 4 is 1500 lbs, and the material of the upper joint 5 is 17-4PH.
[0027] In the present invention, in order to improve the online installation capability of the cable centralizer 1, that is, the cable centralizer 1 is generally installed for certain well sections, so the tool is required to have the ability of online installation, and the parts constituting the cable centralizer 1 should be arranged in a two-half structure and be able to bear force. Based on the above reasons, the structure of the cable centralizer 1 is as follows: the body 3 is composed of two symmetrical body halves 3.1 spliced together, and a slide groove embedding structure 3.2 and a positioning bead 3.3 are arranged at the splicing of the two body halves 3.1; the two body halves 3.1 slide in the axial direction through the slide groove embedding structure 3.2 splicing, slide until the positioning bead 3.3 pops up to locate and eliminate the gap between the two body halves 3.1, forming the body 3 with an inner cavity 30 and a spindle-shaped appearance, and the mud guide grooves 10 are distributed in a circular array on the outer circumference of the body 3.
[0028] More specifically, Figure 1 and Figure 3 As shown, the tail of the upper connector 5 has a slot 50; the cone block 4 is composed of two symmetrical cone halves 4.1 spliced together, and the two cone halves 4.1 are spliced together to form a clamping ring 40 that matches the slot 50 at the top, and the cone block 4 is connected to the tail of the upper connector 5 through the clamping fit between the clamping ring 40 and the slot 50; when the upper connector 5 is axially screwed into the body 3, the cone block 4 is axially pressed downward to be embedded in the inner cavity 30 of the body 3, so as to form a radial clamping force on the cone block 4 through the axial compression of the upper connector 5 and the radial constraint of the inner cavity 30, and the cone block 4 clamps the cable 2 through the radial clamping force.
[0029] More specifically, Figure 2 and Figure 3 As shown, the upper connector 5 is composed of two symmetrical upper connector halves 5.1, and a positioning pin 5.2 is provided at the joint of the two upper connector halves 5.1. The two upper connector halves 5.1 are positioned and spliced by pins and holes to form the upper connector 5 movable on the cable 2. The tail of the upper connector 5 is screwed to the head of the body 3, and the torque needs to reach 50N.m.
[0030] In order to improve the range of cable 2 anti-adsorption card, such as Figure 1 As shown, the cable centralizer 1 is installed on the cable 2 located underground, and a plurality of the cable centralizers 1 are arranged at intervals on the cable 2 .
[0031] like Figure 4 As shown, a system for preventing cable adsorption and jamming in well logging operations includes the cable centralizer 1; the system also includes a cable winch 6 located at the wellhead side and a cable vibrating device 7 located above the wellhead; when the cable winch 6 releases the cable 2, the cable vibrating device 7 drives the cable 2 and the cable centralizer 1 thereon to vibrate. The cable 2 and the cable centralizer 1 vibrate, and maintaining vibration can improve the ability of the cable 2 and the cable centralizer 1 to pass through mud, and while preventing the cable from adsorbing and jamming, it can prevent the mud in the well from adhering to the cable 2 and the cable centralizer 1, and further improve the passability.
[0032] More specifically, the cable vibration device 7 includes an elastic support 71, a cable guide 72 and a vibrator 73; the cable guide 72 is arranged at the wellhead through the elastic support 71, the cable 2 passes through the cable guide 72 and extends into the well, and the vibrator 73 is installed on the elastic support 71.
[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A cable centralizer for preventing cable adsorption and jamming in well logging operations, characterized in that: The invention comprises a cable centralizer (1), wherein the cable centralizer (1) is fixed on the cable (2) in a surrounding and hugging manner, and the cable (2) located underground is isolated from the well wall by the cable centralizer (1), so as to eliminate the adsorption force on the cable (2) underground caused by the drilling fluid leaking into the well wall.
2. A cable centralizer for preventing cable adsorption and jamming in well logging operations according to claim 1, characterized in that: The structural part of the cable centralizer (1) that impacts the downhole mud is spindle-shaped, and in the axial upward direction of the cable centralizer (1), the outer circumferential contour of the spindle-shaped structural part is the outer boundary of the cable centralizer (1).
3. A cable centralizer for preventing cable adsorption and jamming in well logging operations according to claim 2, characterized in that: The outer circumferential surface of the cable centralizer (1) is provided with mud guide grooves (10) in an array, and the cable centralizer (1) improves mud passability through the mud guide grooves (10).
4. A cable centralizer for preventing cable adsorption and jamming in well logging operations according to claim 3, characterized in that: The cable straightener (1) comprises a body (3), a cone block (4) and an upper joint (5); the body (3) has an inner cavity (30) adapted to the cone block (4); the upper joint (5) extends into the inner cavity (30) to press the cone block (4) so that the cone block (4) generates a clamping force on the cable (2); the cone block (4) converts the axial pressure applied by the upper joint (5) into a radial clamping force to hold the cable (2); the body (3), the cone block (4) and the upper joint (5) are relatively fixed to form the cable straightener (1) fixed on the cable (1), and the cable straightener (1) keeps the cable (1) away from the well wall through the radial isolation of the body (3).
5. A cable centralizer for preventing cable adsorption and jamming in well logging operations according to claim 4, characterized in that: The body (3) is composed of two symmetrical body halves (3.1) spliced together, and a slide groove embedding structure (3.2) and a positioning bead (3.3) are arranged at the splicing position of the two body halves (3.1); the two body halves (3.1) slide in the axial direction through the slide groove embedding structure (3.2) and are spliced together, and slide until the positioning bead (3.3) pops up to locate and eliminate the gap between the two body halves (3.1), forming the body (3) with an inner cavity (30) inside and a spindle-shaped outer shape, and the mud guide grooves (10) are distributed in a circular array on the outer circumferential surface of the body (3).
6. A cable centralizer for preventing cable adsorption and jamming in well logging operations according to claim 5, characterized in that: The tail of the upper connector (5) is provided with a slot (50); the cone block (4) is composed of two symmetrical cone halves (4.1) spliced together, and the two cone halves (4.1) are spliced together to form a clamping ring (40) that matches the slot (50) at the top, and the cone block (4) is connected to the tail of the upper connector (5) through the clamping fit between the clamping ring (40) and the slot (50); when the upper connector (5) is axially screwed into the body (3), the cone block (4) is axially pressed downward to be embedded in the inner cavity (30) of the body (3), so that a radial clamping force is formed on the cone block (4) through the axial compression of the upper connector (5) and the radial restraint of the inner cavity (30), and the cone block (4) holds the cable (2) tightly through the radial clamping force.
7. A cable centralizer for preventing cable adsorption and jamming in well logging operations according to claim 6, characterized in that: The upper joint (5) is composed of two symmetrical upper joint halves (5.1) spliced together, and a positioning pin (5.2) is provided at the splicing position of the two upper joint halves (5.1). The two upper joint halves (5.1) are positioned and spliced by pins and holes to form the upper joint (5) that can move on the cable (2), and the tail of the upper joint (5) is screwed to the head of the body (3) by thread.
8. A cable centralizer for preventing cable adsorption and jamming in well logging operations according to claim 7, characterized in that: The cable centralizer (1) is installed on the cable (2) located underground, and a plurality of the cable centralizers (1) are arranged at intervals on the cable (2).
9. A system for preventing cable adsorption in well logging operations according to claim 8, characterized in that: The system comprises the cable centralizer (1); the system also comprises a cable winch (6) located at the wellhead side and a cable vibrating device (7) located above the wellhead; when the cable winch (6) releases the cable (2), the cable vibrating device (7) drives the cable (2) and the cable centralizer (1) thereon to vibrate.
10. A system for preventing cable adsorption in well logging operations according to claim 9, characterized in that: The cable vibration device (7) comprises an elastic support (71), a cable guide (72) and a vibrator (73); the cable guide (72) is arranged at the wellhead through the elastic support (71), the cable (2) passes through the cable guide (72) and extends into the well, and the vibrator (73) is installed on the elastic support (71).