Combined type diverter of logging-while-drilling instrument

Abstract

The invention relates to the technical field of logging-while-drilling instruments, in particular to a combined type flow divider of a logging-while-drilling instrument, and aims to solve the problems that an existing flow divider is prone to fatigue damage and sealing failure during use. The invention provides a combined type flow divider of a logging-while-drilling instrument. The combined type flow divider comprises a flow divider upper connector, a flow divider body, a flow divider erosion-resistant sleeve and a pressing sleeve. The diverter upper joint is in threaded connection with the diverter main body, a first wire passing hole is formed in the diverter upper joint, a second wire passing hole is formed in the diverter main body, and a first sealing ring is arranged between the diverter upper joint and the diverter main body; a second sealing ring is arranged between the flow divider erosion-resistant sleeve and the flow divider main body; one end, far away from the diverter upper joint, of the diverter main body is connected with a first step surface of an external drill collar, and liquid flows in from the first fluid channel and flows out from the second fluid channel; the pressing sleeve is arranged on the flow divider upper connector in a sleeving mode, and the pressing sleeve close to the flow divider body is connected with the flow divider body.

Description

Technical Field

[0001] The invention relates to the technical field of logging while drilling instruments, and in particular to a combined flow divider for logging while drilling instruments. Background Art

[0002] At present, the workload of unconventional development such as Dagang shale oil, Jidong Oilfield, Tarim Oilfield continues to grow, and there is an urgent need for logging while drilling tools with formation evaluation systems; as exploration and development move towards deeper formations, Bohai Drilling Engineering Co., Ltd. has an increasing demand for small-size (4-3 / 4") logging while drilling tools.

[0003] At present, Bohai Drilling Engineering Co., Ltd. has a small number of 4-3 / 4" logging while drilling tools, and as a key component of the tool, the structure of the diverter has the hidden dangers of fatigue and sealing failure caused by alternating stress. The specific reasons are as follows: the existing diverter is installed inside the drill collar, and the fluid flows from the diverter inlet to the diverter outlet. Since the difference between the flow area of ​​the diverter inlet and the flow area of ​​the outlet is smaller than the cross-sectional area of ​​the upper rod of the diverter, the diverter tends to be stressed in the direction close to the diverter inlet, so that the end face of the diverter that should fit with the step surface of the drill collar cannot be fully fitted, causing the positioning pin to be stressed. After a long period of operation, shear deformation and fatigue damage are prone to occur. The existing 4-3 / 4" logging while drilling tools are imported. Due to the limitation of the overall size of the tool, it is not feasible to modify the structure of the current diverter. Therefore, it is very necessary to independently develop and design a combined diverter for use in 4-3 / 4" logging while drilling tools. Summary of the invention

[0004] The object of the present invention is to provide a combined flow divider for a logging while drilling instrument, so as to solve the problems of easy fatigue damage and sealing failure of the existing flow divider during use.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A combined flow divider for a logging while drilling tool, comprising: a flow divider upper joint, a flow divider body, a flow divider erosion-resistant sleeve and a plurality of compression sleeves;

[0007] The upper joint of the flow divider is threadedly connected to the main body of the flow divider, the upper joint of the flow divider is provided with a first wire hole, the main body of the flow divider is provided with a second wire hole, the first wire hole is communicated with the second wire hole, and a first sealing ring is provided between the upper joint of the flow divider and the main body of the flow divider;

[0008] The erosion-resistant sleeve of the diverter is inserted into the diverter body and is threadedly connected to the diverter body. A second sealing ring is provided between the erosion-resistant sleeve of the diverter and the diverter body.

[0009] One end of the diverter body away from the diverter upper joint is connected to the first step surface of the external drill collar, the diverter body is provided with a first fluid channel, the diverter erosion-resistant sleeve is provided with a second fluid channel, the first fluid channel is connected with the second fluid channel, and liquid flows in from the first fluid channel and flows out from the second fluid channel;

[0010] The compression sleeve is sleeved on the upper joint of the diverter and connected to the external drill collar, and the compression sleeve close to the diverter body is connected to the diverter body.

[0011] Furthermore, one end of the diverter erosion-resistant sleeve away from the diverter upper joint is connected to the second step surface of the external drill collar.

[0012] Furthermore, a third fluid channel is formed between the compression sleeve and the upper joint of the diverter, and the third fluid channel is communicated with the first fluid channel.

[0013] Furthermore, the diverter body is provided with a fixing pin hole for inserting a fixing pin, and the diverter body is connected to an external drill collar via the fixing pin.

[0014] Furthermore, the diverter body is provided with a connector mounting hole.

[0015] Furthermore, the diverter body is provided with a third wire passing hole, and the third wire passing hole is connected with the second wire passing hole.

[0016] Furthermore, the third wire passing hole is connected to the connector mounting hole.

[0017] Furthermore, a third sealing ring is sleeved on the outside of the upper joint of the diverter.

[0018] Furthermore, a fourth sealing ring is provided between the diverter body and the external drill collar.

[0019] Furthermore, a fifth sealing ring is provided between the diverter erosion-resistant sleeve and the external drill collar.

[0020] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0021] The main body of the flow divider is fitted with the first step surface of the external drill collar for limiting, and the compression sleeve is fitted with the main body of the flow divider for fixing, which improves the force environment of the flow divider when it is subjected to impact and vibration, improves the ability of the combined flow divider of the logging while drilling tool to resist impact and vibration when working underground, and improves the overall working life of the logging while drilling tool; Figure 1As shown, a replaceable diverter erosion-resistant sleeve is used at the flow channel change point, which reduces the fluid erosion caused by the change of the flow area of ​​the external drill collar flow channel. The upper joint of the diverter must be tightened by an upper torque during assembly, and the outer surface is prone to wear and damage. A combined structural design is adopted, which is convenient for replacement; the first sealing ring assembled between the upper joint of the diverter and the diverter body can prevent external fluid from entering the wire holes inside the upper joint of the diverter and the diverter body, and the second sealing ring assembled between the diverter body and the diverter erosion-resistant sleeve can prevent external fluid from entering the mating surface gap between the diverter body and the diverter erosion-resistant sleeve; the combined diverter of the logging while drilling instrument provided by the present invention solves the problems of easy fatigue damage and sealing failure of the existing diverter during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a combined flow diverter for a logging while drilling tool provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the assembly of the combined diverter and external drill collar of the logging while drilling tool.

[0025] Icon: 100-diverter upper connector; 110-first wire hole; 200-diverter body; 210-second wire hole; 220-first fluid channel; 230-fixing pin hole; 240-connector mounting hole; 250-third wire hole; 300-diverter erosion-resistant sleeve; 310-second fluid channel; 400-compression sleeve; 410-third fluid channel; 500-first sealing ring; 600-second sealing ring; 700-third sealing ring; 800-fourth sealing ring; 900-fifth sealing ring; 1000-external drill collar; 1010-first step surface; 1020-second step surface; 1100-fixing pin. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0029] The present invention provides a combined flow divider for a logging while drilling instrument, comprising: a flow divider upper joint 100, a flow divider body 200, a flow divider erosion-resistant sleeve 300 and a plurality of compression sleeves 400; the flow divider upper joint 100 is threadedly connected to the flow divider body 200, the flow divider upper joint 100 is provided with a first wire hole 110, the flow divider body 200 is provided with a second wire hole 210, the first wire hole 110 is communicated with the second wire hole 210, a first sealing ring 500 is arranged between the flow divider upper joint 100 and the flow divider body 200; the flow divider erosion-resistant sleeve 300 is inserted into the flow divider body 200 and is threadedly connected to the flow divider body 200, ... 00 and the diverter body 200 are provided with a second sealing ring 600; one end of the diverter body 200 away from the diverter upper joint 100 is connected to the first step surface 1010 of the external drill collar 1000, the diverter body 200 is provided with a first fluid channel 220, and the diverter erosion-resistant sleeve 300 is provided with a second fluid channel 310, the first fluid channel 220 is connected with the second fluid channel 310, the liquid flows in from the first fluid channel 220 and flows out from the second fluid channel 310; the compression sleeve 400 is sleeved on the diverter upper joint 100 and is connected to the external drill collar 1000, and the compression sleeve 400 close to the diverter body 200 is connected to the diverter body 200.

[0030] The diverter body 200 is fitted with the first step surface 1010 of the external drill collar 1000 for limiting, and the compression sleeve 400 is fitted with the diverter body 200 for fixing, which improves the force environment of the diverter when it is subjected to impact vibration, improves the ability of the combined diverter of the logging while drilling tool to resist impact vibration when working underground, and improves the overall working life of the logging while drilling tool; Figure 1As shown, a replaceable diverter erosion-resistant sleeve 300 is used at the flow channel change point, which reduces the fluid erosion caused by the change of the flow area of ​​the external drill collar 1000 flow channel. The diverter upper joint 100 must be tightened by an upper torque during assembly, and the outer surface is prone to wear and damage. A combined structural design is adopted, which is convenient for replacement; the first sealing ring 500 assembled between the diverter upper joint 100 and the diverter body 200 can prevent external fluid from entering the wire holes inside the diverter upper joint 100 and the diverter body 200, and the second sealing ring 600 assembled between the diverter body 200 and the diverter erosion-resistant sleeve 300 can prevent external fluid from entering the mating surface gap between the diverter body 200 and the diverter erosion-resistant sleeve 300; the combined diverter for the logging while drilling instrument provided by the present invention solves the problems of easy fatigue damage and sealing failure of the existing diverter during use.

[0031] The following combination Figure 1-Figure 2 The structure and shape of the combined flow diverter of the logging while drilling tool provided in this embodiment are described in detail.

[0032] Regarding the shapes and structures of the splitter upper joint 100, the splitter body 200 and the splitter erosion-resistant sleeve 300, in detail:

[0033] Reference Figure 2 The splitter upper joint 100, the splitter body 200 and the splitter erosion-resistant sleeve 300 are all located inside the outer drill collar 1000. Figure 1 The upper joint 100 of the diverter and the main body 200 of the diverter are assembled by threads, and two first sealing rings 500 realize the sealing between the upper joint 100 of the diverter and the main body 200 to prevent the first wire hole 110 and the second wire hole 210 from entering the external fluid.

[0034] An extension section extends from one end of the diverter body 200 close to the diverter upper joint 100 , and the extension section extends into the diverter upper joint 100 and is threadedly connected to the diverter upper joint 100 . The extension section and the diverter upper joint 100 are sealed by a first sealing ring 500 .

[0035] The diverter upper joint 100 is provided with a first wire hole 110, and the diverter body 200 is provided with a second wire hole 210, and the first wire hole 110 is connected with the second wire hole 210. The diverter body 200 is also provided with a connector mounting hole 240 and a third wire hole 250, and the third wire hole 250 is connected with the second wire hole 210, and the third wire hole 250 is connected with the connector mounting hole 240. Cables are placed in the first wire hole 110, the second wire hole 210 and the third wire hole 250. The connector mounting hole 240 is used to install a connector to realize the overall communication of the logging while drilling instrument.

[0036] The diverter body 200 is provided with a fixing pin hole 230 for inserting the fixing pin 1100, and the diverter body 200 is connected to the external drill collar 1000 through the fixing pin 1100. The fixing pin hole 230 is used to realize the positioning of the combined diverter of the logging while drilling tool and the external drill collar 1000 during the assembly process.

[0037] The outer part of the upper joint 100 of the flow splitter is sleeved with a third sealing ring 700 . One end of the upper joint 100 of the flow splitter away from the flow splitter body 200 is connected to the upper connecting piece. The upper joint 100 of the flow splitter and the upper connecting piece are sealed by the third sealing ring 700 .

[0038] The diverter body 200 and the diverter erosion-resistant sleeve 300 are assembled by threads, and two second sealing rings 600 realize the sealing between the diverter body 200 and the diverter erosion-resistant sleeve 300 to prevent external fluid from entering the mating surface gap between the diverter body 200 and the diverter erosion-resistant sleeve 300, causing disassembly difficulty.

[0039] The splitter body 200 is provided with a first fluid channel 220 , and the splitter erosion-resistant sleeve 300 is provided with a second fluid channel 310 . The first fluid channel 220 is connected with the second fluid channel 310 , and liquid flows in from the first fluid channel 220 and flows out from the second fluid channel 310 .

[0040] One end of the diverter body 200 away from the diverter upper joint 100 is connected to the first step surface 1010 of the external drill collar 1000 , and one end of the diverter erosion-resistant sleeve 300 away from the diverter upper joint 100 is connected to the second step surface 1020 of the external drill collar 1000 .

[0041] Regarding the shape and structure of the compression sleeve 400, in detail:

[0042] The compression sleeve 400 is sleeved on the upper joint 100 of the flow divider and connected to the external drill collar 1000. In this embodiment, a plurality of compression sleeves 400 connected in sequence are provided, and the compression sleeve 400 close to the flow divider body 200 is connected to the flow divider body 200. A third fluid channel 410 is formed between the compression sleeve 400 and the upper joint 100 of the flow divider, and the third fluid channel 410 is connected to the first fluid channel 220. The liquid flows into the third channel, passes through the second channel, and finally flows out of the third channel.

[0043] Regarding the assembly of the combined flow diverter of the logging while drilling tool provided in this embodiment and the external drill collar 1000:

[0044] The combined flow diverter of the logging while drilling instrument provided in this embodiment can be used horizontally or vertically, and the direction of use is not limited. In order to show the structure more clearly, the vertical use of the flow diverter is taken as an example below. In the following examples, the orientation when the embodiment is used vertically shall prevail. The lower end surface of the flow diverter body 200 is fitted with the first step surface 1010 of the external drill collar 1000 for limiting. In this embodiment, multiple compression sleeves 400 can be set. The lower end surface of the compression sleeve 400 close to the flow diverter body 200 is fitted with the upper end surface of the flow diverter body 200 to achieve the fixation of the combined flow diverter of the logging while drilling instrument in the external drill collar 1000, improve the force environment of the fixing pin 1100 when it is subjected to impact vibration during work, improve the ability of the combined flow diverter of the logging while drilling instrument to resist impact vibration when working underground, and improve the overall working life of the logging while drilling instrument.

[0045] A fourth sealing ring 800 is arranged between the diverter body 200 and the external drill collar 1000, and a fifth sealing ring 900 is arranged between the diverter erosion-resistant sleeve 300 and the external drill collar 1000. The four fourth sealing rings 800 and the two fifth sealing rings 900 realize the sealing between the combined diverter of the logging while drilling tool and the external drill collar 1000, preventing external fluid from entering the matching surface gap between the combined diverter of the logging while drilling tool and the external drill collar 1000.

[0046] In an optional embodiment, the first sealing ring is 29.74×3.53 (inner diameter×wire diameter, unit: mm), the second sealing ring is 56.74×3.53 (inner diameter×wire diameter, unit: mm), the third sealing ring is 32.92×3.53 (inner diameter×wire diameter, unit: mm), the fourth sealing ring is 72.62×3.53 (inner diameter×wire diameter, unit: mm) and the fifth sealing ring is 59.92×3.53 (inner diameter×wire diameter, unit: mm).

[0047] In the combined diverter of the logging while drilling instrument provided in this embodiment, the second fluid channel 310 of the diverter erosion-resistant sleeve 300 is the fluid outlet of the diverter. In this embodiment, the inner diameter of the diverter is reduced, so that the difference between the flow area at the inlet and the flow area at the outlet of the diverter is larger than the cross-sectional area of ​​the upper rod of the diverter, so that the diverter tends to be pressed toward the fluid outlet, and the end face of the diverter body 200 is tightly attached to the first step surface 1010, thereby improving the force on the fixing pin 1100 and making the fixing pin 1100 no longer subjected to shear force.

[0048] The combined flow divider of the logging while drilling instrument provided in this embodiment improves the ability of the key components of the logging while drilling instrument to resist fluid erosion when working underground. Through modeling calculation and analysis, the flow area of ​​the combined flow divider of the logging while drilling instrument is 1470mm 2, which is equivalent to a flow channel diameter of 43.26 mm. At a fluid displacement of 20 L / s, the local flow velocity is 13.6 m / s, with little erosion, which improves the overall working life of the logging while drilling tool.

[0049] The combined flow diverter of the logging while drilling instrument provided in this embodiment is a component of the logging while drilling instrument. The combined flow diverter of the logging while drilling instrument provided in this embodiment is a 4-3 / 4" combined flow diverter of the logging while drilling instrument, which is specially applied to the 4-3 / 4" logging while drilling tool (i.e., 4.75-inch logging while drilling tool), and is applicable to the specification of the drill collar of 6-inch 2 and 6-inch 6 wellbore (drill bit size) of 4-3 / 4". The combined flow diverter of the logging while drilling instrument provided in this embodiment adopts a detachable and combined structure, and the replacement of the components is convenient and simple.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combined flow divider for a logging while drilling tool, characterized in that: include: A splitter upper joint (100), a splitter body (200), a splitter erosion-resistant sleeve (300), and a plurality of compression sleeves (400); The upper joint (100) of the flow divider is threadedly connected to the main body (200) of the flow divider, the upper joint (100) of the flow divider is provided with a first wire hole (110), the main body (200) of the flow divider is provided with a second wire hole (210), the first wire hole (110) is communicated with the second wire hole (210), and a first sealing ring (500) is provided between the upper joint (100) of the flow divider and the main body (200); The diverter erosion-resistant sleeve (300) is inserted into the diverter body (200) and is threadedly connected to the diverter body (200); a second sealing ring (600) is provided between the diverter erosion-resistant sleeve (300) and the diverter body (200); One end of the flow divider body (200) away from the flow divider upper joint (100) is connected to a first step surface (1010) of an external drill collar (1000); the flow divider body (200) is provided with a first fluid channel (220); the flow divider erosion-resistant sleeve (300) is provided with a second fluid channel (310); the first fluid channel (220) is connected to the second fluid channel (310); liquid flows in from the first fluid channel (220) and flows out from the second fluid channel (310); The compression sleeve (400) is sleeved on the upper joint (100) of the flow divider and connected to the external drill collar (1000); the compression sleeve (400) close to the flow divider body (200) is connected to the flow divider body (200).

2. The combined flow divider of the logging while drilling tool according to claim 1, characterized in that: One end of the diverter erosion-resistant sleeve (300) away from the diverter upper joint (100) is connected to the second step surface (1020) of the external drill collar (1000).

3. The combined flow divider of the logging while drilling tool according to claim 1, characterized in that: A third fluid channel (410) is formed between the compression sleeve (400) and the upper joint (100) of the flow divider, and the third fluid channel (410) is in communication with the first fluid channel (220).

4. The combined flow divider of the logging while drilling tool according to claim 1, characterized in that: The diverter body (200) is provided with a fixing pin hole (230) for inserting a fixing pin (1100), and the diverter body (200) is connected to an external drill collar (1000) via the fixing pin (1100).

5. The combined flow divider of the logging while drilling tool according to claim 1, characterized in that: The diverter body (200) is provided with a connector mounting hole (240).

6. The combined flow divider of the logging while drilling tool according to claim 1, characterized in that: The diverter body (200) is provided with a third wire-passing hole (250), and the third wire-passing hole (250) is communicated with the second wire-passing hole (210).

7. The combined flow divider of the logging while drilling tool according to claim 6, characterized in that: The third wire passing hole (250) is in communication with the connector mounting hole (240).

8. The combined flow divider of the logging while drilling tool according to claim 1, characterized in that: The outer portion of the upper joint (100) of the flow divider is sleeved with a third sealing ring (700).

9. The combined flow divider of the logging while drilling tool according to claim 1, characterized in that: A fourth sealing ring (800) is provided between the diverter body (200) and the external drill collar (1000).

10. The combined flow divider of the logging while drilling tool according to claim 1, characterized in that: A fifth sealing ring (900) is provided between the diverter erosion-resistant sleeve (300) and the external drill collar (1000).

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