Length adjusting device and adjusting method suitable for various measurement-while-drilling instruments

Abstract

The invention relates to the field of petroleum drilling underground testing instruments, in particular to a length adjusting device and method suitable for various measurement-while-drilling instruments. The problems that existing while-drilling instrument connecting structures are not universal, length adjusting methods are different, and maintenance is facilitated are mainly solved. Comprising a conversion connector (1) and a measurement-while-drilling drill collar (4), the conversion connector (1) is located in the measurement-while-drilling drill collar (4), the right end of the conversion connector (1) is connected with a length adjusting assembly (3), the conversion connector (1) is connected with the length adjusting assembly (3) through a single-core contact pin (2), and the right end of the measurement-while-drilling drill collar (4) is connected with a lower connecting assembly (5). And the lower connecting assembly (5) is connected with a female contact pin (314) in the length adjusting assembly (3) through an adapter (502). According to the length adjusting device, unification of a length adjusting system of the instrument while drilling is achieved, the maintenance cost is greatly reduced, and the maintenance period is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil drilling downhole testing instruments, in particular to a length adjusting device and adjusting method suitable for various measurement-while-drilling instruments. BACKGROUND

[0002] In the development of oil and gas fields, the application of measurement-while-drilling instruments is an important means to improve the sandstone drilling rate and find sweet spots in drilling operations, greatly improving the production of oil and gas wells, and is widely used in drilling operations. There are various types and specifications of measurement-while-drilling instruments, such as resistivity, azimuth gamma, MWD and rotary steering system, etc. These measurement-while-drilling instruments need to connect and pass through the drill collar inside each module, which requires connection between two short circuits, and in order to ensure that the external drill collar can realize multiple buckling and internal bus connection, a length adjusting system is needed to realize the connection of the bus and the change of the internal length. At present, each type of measurement-while-drilling instrument has a connection structure, and these connection structures are not mutually compatible, and the length adjustment method is different, which puts forward higher requirements for maintenance, and is not conducive to cost reduction. SUMMARY

[0003] In order to overcome the deficiencies of the existing measurement-while-drilling instrument connection structure that is not mutually compatible and the length adjustment method that is different, the present application provides a length adjusting device and adjusting method suitable for various measurement-while-drilling instruments, which realizes the unification of the length adjusting system of the measurement-while-drilling instrument, greatly reduces the maintenance cost, and shortens the maintenance period.

[0004] The technical scheme of the present application is: a length adjusting device suitable for various measurement-while-drilling instruments, comprising a conversion joint, a measurement-while-drilling drill collar, the conversion joint being located inside the measurement-while-drilling drill collar, the right end of the conversion joint being connected with a length adjusting assembly, and the conversion joint and the length adjusting assembly being connected through a single core pin, the right end of the measurement-while-drilling drill collar being connected with a lower connection assembly.

[0005] The length adjusting assembly comprises an anti-wear protection probe pipe, the inside of the anti-wear protection probe pipe is provided with a female pin support connected with the single core pin, the right end of the anti-wear protection probe pipe is connected with an extension probe pipe, the inside of the extension probe pipe is provided with a female pin support connected with the lower connection assembly.

[0006] The lower connection assembly comprises a lower connection drill collar, the lower connection drill collar is threadedly connected with the measurement-while-drilling drill collar at the left end; the inside of the lower connection drill collar is provided with an adapter connected with the female pin; and a conductive ring is fixed on the right end face of the lower connection drill collar.

[0007] The length of the isolation sleeve and the adapter is selected according to different working conditions.

[0008] Further, the anti-abrasion protection probe wall is provided with a step, the female pin support outer surface is provided with a boss, the female pin support boss is located on the left side of the anti-abrasion protection probe step, and a compression spring is arranged between the two.

[0009] Further, the anti-abrasion protection probe is internally provided with a guide tube, and the right end of the female pin support is located inside the guide tube.

[0010] Further, the left end of the telescopic rod is located inside the extension probe, and the left end of the telescopic rod is externally provided with two opposite planar grooves, and a fixing hole is formed in the middle part of the telescopic rod side wall; the extension probe side wall is provided with two opposite anti-rotation holes, an anti-rotation pin is connected in the anti-rotation hole, and the end of the anti-rotation pin is located in the planar groove.

[0011] Further, the female pin is located inside the female pin base, the female pin base is connected inside the telescopic rod through the compression ring; the left end of the female pin base is connected with the socket rod, and the compression spring is arranged between the left end of the female pin base and the step surface of the telescopic rod.

[0012] Further, the right end of the socket rod is externally provided with two opposite anti-rotation grooves, the anti-rotation grooves correspond to the fixing holes on the telescopic rod, a fixing pin is connected in the fixing hole, and the end of the fixing pin is located in the anti-rotation groove.

[0013] Further, the adapter is connected to the adapter base, the adapter base is connected with the flow guide base, the flow guide base is located inside the lower part of the connection drill collar, and the flow guide base left side is fixed through the flow guide base compression ring.

[0014] Further, the flow guide base and the lower part of the connection drill collar side wall are fixed through the anti-rotation ring to prevent the flow guide base from rotating.

[0015] Further, the lower part of the connection drill collar side wall is provided with a drill collar vertical hole, and the anti-rotation ring is located in the drill collar vertical hole; an axial horizontal hole is formed in the right end of the lower part of the connection drill collar side wall, one end of the horizontal hole is communicated with the drill collar vertical hole through an inclined hole, and the other end is communicated with the recess on the right end surface of the lower part of the connection drill collar; the conductive ring is located in the recess on the right end surface of the lower part of the connection drill collar.

[0016] Further, the flow guide base is internally provided with a central inner hole and a flow guide base vertical hole which are communicated, and the flow guide base vertical hole corresponds to the drill collar vertical hole, and the end of the anti-rotation ring is located in the flow guide base vertical hole.

[0017] Further, the flow guide base is provided with an axial flow guide channel.

[0018] Further, the flow guide base compression ring is selected with different lengths according to different working conditions.

[0019] Further, the single-core pin right end is connected with the first section of the conductor wire, and the first section of the conductor wire right end is sequentially connected with the extension probe, the telescopic rod, the socket rod, and the female pin socket, and then connected with the female pin;

[0020] The adapter right end is connected with the second section of the conductor wire, and the second section of the conductor wire right end is sequentially connected with the adapter base, the center inner hole of the flow guide base, and the vertical hole of the flow guide base, and then the end part is located outside the vertical hole of the flow guide base;

[0021] The conductive ring left end is connected with the third section of the conductor wire, and the third section of the conductor wire left end is sequentially connected with the horizontal hole, the inclined hole, and the vertical hole of the drill collar, and then the end part is welded with the second section of the conductor wire.

[0022] A length adjustment method of the length adjustment device suitable for various MWD instruments, comprising:

[0023] a. Determine the length of the isolation sleeve: the length of the isolation sleeve is determined according to the length between the right end face of the conversion joint and the right end face of the MWD drill collar 4;

[0024] b. Determine the length of the adapter: the length of the adapter is determined according to the distance between the right end step face of the MWD drill collar and the right end face of the female pin;

[0025] c. Determine the length of the flow guide base compression ring: the length of the flow guide base compression ring is determined according to the length of the MWD drill collar extending into the lower connection drill collar when the MWD drill collar is connected with the lower connection drill collar.

[0026] Further, in the step a, first measure the length L1 between the right end face of the conversion joint and the right end face of the MWD drill collar 4;

[0027] The length L10 of the isolation sleeve is:

[0028] L10 = L1-L2-L9-L11-L12

[0029] In the formula, L2 is the length between the right end face of the protection cap and the right end face of the MWD drill collar; L9 is the length between the left step end face and the right end face of the wear-resistant protection pipe; L11 is the length of the protection cap; and L12 is the length between the left step face and the right end face of the extension probe.

[0030] Further, in the step b, measure the length L15 between the right end step face of the MWD drill collar and the right end face of the female pin;

[0031] Suppose the distance between the pin end face of the adapter and the left end face of the lower connection drill collar is L16, then 0.5in < L15-L16 < 1.5in;

[0032] The length L13 of the adapter is:

[0033] L13 = L14-L16+L5

[0034] L14 is the length of the lower connection between the left end face of the drill collar and the left end face of the adapter base; L5 is the length of the adapter pin end face to the pin bottom.

[0035] Further, the maximum length of the adapter is:

[0036] L13max = L14 - (L15 - 0.5) + L5

[0037] The minimum length of the adapter is:

[0038] L13min = L14 - (L15 - 1.5) + L5

[0039] Further, in step c, first measure the length L4 from the right step end face of the MWD drill collar to the right end face of the MWD drill collar, and the length L7 of the flow seat compression ring is:

[0040] L7 = L17 - L4 + YK1

[0041] L17 is the length of the lower connection between the left end face of the drill collar and the left end face of the flow seat; YK1 is the compression length of the flow seat compression ring.

[0042] The present application has the following beneficial effects: due to the above-mentioned scheme, the present application realizes length adjustment of various MWD instruments through a set of devices, reduces maintenance cost, and shortens the maintenance period. When maintaining each time, only the appropriate connecting head is matched with the joint of a certain MWD instrument, and the connection of various MWD instruments can be realized, which effectively reduces the accessory cost. For maintenance personnel, once trained, the maintenance work of various MWD instruments can be realized, which reduces the personnel training cost. As for the system itself, by selecting isolation sleeves and adapters of different lengths, length adjustment of 25-30 cm can be realized, which can ensure the need of 4-5 times of drill collar pick-off, and effectively improves the service life of the external drill collar. The present application is suitable for all single-bus MWD instruments, and has broad application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a structural schematic diagram of the present application;

[0044] Figure 2 is a sectional view of the length adjustment assembly;

[0045] Figure 3 is a schematic diagram of the extension probe in the length adjustment assembly;

[0046] Figure 4 is a schematic diagram of the telescopic rod in the length adjustment assembly;

[0047] Figure 5is a schematic view of the socket rod in the length adjustment assembly;

[0048] Figure 6 is a sectional view of the lower connection assembly;

[0049] Figure 7 is an outline view of the lower connection assembly;

[0050] Figure 8 is a sectional view along Figure 7 A-A in the length adjustment assembly;

[0051] Figure 9 is a sectional view along Figure 8 B-B in the length adjustment assembly;

[0052] Figure 10 is an outline view of the flow guide seat in the lower connection assembly;

[0053] Figure 11 is a sectional view of the flow guide seat in the lower connection assembly;

[0054] Figure 12 is an outline view of the adapter in the lower connection assembly;

[0055] Figure 13 is a schematic view of the female pin holder when retracted;

[0056] Figure 14 is a schematic view of the installation dimensions of the length adjustment assembly;

[0057] Figure 15 is a schematic view of the installation dimensions of the lower connection assembly;

[0058] Figure 16 is a schematic view of the dimensions of the length adjustment assembly.

[0059] In the diagram: 1-Adapter connector, 2-Single-core pin, 3-Length adjustment assembly, 4-Measurement while Drilling collar, 5-Lower connection assembly, 301-Female pin holder, 302-Compression spring, 303-Guide tube, 304-Anti-wear protection probe, 305-Extension probe, 3051-Anti-rotation hole, 306-Shock damping ring, 307-Telescopic rod, 3071-Flat groove, 3072-Shock damping groove, 3073-Fixing hole, 308-Isolation sleeve, 309-Socket rod, 3091-Anti-rotation groove, 310-Compression spring, 311-Protective cap, 312-Female pin base 313-Clamping ring, 314-Female pin, 315-Sealing ring A, 501-Lower connecting drill collar, 5011-Drill collar vertical hole, 5012-Angled hole, 5013-Horizontal hole, 502-Adapter, 503-Adapter base, 504-Flow guide seat clamping ring, 505-Sealing ring B, 506-Flow guide seat, 5061-Central inner hole, 5062-Flow guide seat vertical hole, 5063-Flow guide channel, 507-Sealing ring C, 508-Cover plate, 509-Anti-rotation ring, 510-Conductive ring, 511-Fixing bolt, 512-Sealing ring D. Detailed Implementation

[0060] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] In the description of this invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "top," and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings. They are intended only to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the components referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] Depend on Figure 1 As shown, a length adjustment device suitable for various measurement-while-drilling (MWD) instruments includes a conversion connector 1 and a MWD drill collar 4. The conversion connector 1 is located inside the MWD drill collar 4. The left end of the conversion connector 1 is connected to an upper probe. The thread on the left end of the conversion connector 1 can be machined into various specifications as needed for connection with different upper probes. The right end of the conversion connector 1 is connected to a length adjustment assembly 3 via a thread, and the conversion connector 1 and the length adjustment assembly 3 are connected by a single-core pin 2. The right end of the MWD drill collar 4 is threaded to a lower connection assembly 5. The adapter 502 on the left end of the lower connection assembly 5 is connected to the female pin 314 on the right end of the length adjustment assembly 3.

[0063] As shown in Figures 2 to 5 The length adjusting assembly 3 includes a wear-resistant protective probe tube 304, which is internally provided with a female pin holder 301 connected with the single-core pin 2 to realize circuit transmission. As preferred, the inner wall of the wear-resistant protective probe tube 304 is provided with a step, and the wear-resistant protective probe tube 304 is internally provided with a guide tube 303, the outer boss of which is matched with the step of the inner wall of the wear-resistant protective probe tube 304. The lower end of the female pin holder 301 is located inside the guide tube 303, the outer surface of the female pin holder 301 is provided with a boss, the boss of the female pin holder 301 is located at the left side of the guide tube 303, and a compression spring 302 is arranged between the boss of the female pin holder 301 and the left end surface of the guide tube 303.

[0064] When the upper probe tube is connected to the conversion joint 1, a bus is led out through the pin in the upper probe tube short circuit, the bus passes through the inner hole of the conversion joint 1, and is connected with the single-core pin 2 together. After the right end thread of the conversion joint 1 is connected with the left end thread of the wear-resistant protective probe tube 304, under the action of the compression spring 302, the single-core pin 2 and the female pin in the female pin holder 301 are in a compressed state, which can ensure the stability of electrical connection under strong vibration in the well, as shown in Figure 13 That is, the state when the female pin holder is retracted.

[0065] The right end of the wear-resistant protective probe tube 304 is connected with an extended probe tube 305, the right end of the extended probe tube 305 is connected with an isolation sleeve 308, the right end of the isolation sleeve 308 is connected with a protective cap 311, and the length of the isolation sleeve 308 can be provided in multiple specifications for selection according to different working conditions. The inside of the isolation sleeve 308 is provided with a telescopic rod 307, the outer surface of the left end of the telescopic rod 307 is provided with a shock-absorbing ring 306, the left end of the telescopic rod 307 extends into the inside of the extended probe tube 305, the extended probe tube 305 has a relatively long internal space, and when the selected specification of the isolation sleeve 308 is the shortest specification, the telescopic rod 307 has enough space to extend deeply into the extended probe tube 305. The right end of the telescopic rod 307 is internally provided with a female pin 314 connected with the lower connection assembly 5. The outer surface of the left end of the telescopic rod 307 is provided with two opposite flat grooves 3071, a plurality of shock-absorbing grooves 3072 are opened on the side wall of the middle part of the telescopic rod 307, and a fixing hole 3073 is opened on the side wall of the right part of the telescopic rod 307. The flat grooves 3071 are used to avoid damage to the wire caused by relative rotation between the telescopic rod 307 and the extended probe tube 305, two opposite anti-rotation holes 3051 are opened on the side wall of the extended probe tube 305, an anti-rotation pin is connected in the anti-rotation holes 3051, and the end of the anti-rotation pin is located in the flat grooves 3071, so as to prevent the relative rotation between the telescopic rod 307 and the extended probe tube 305. After an O-ring is arranged in the shock-absorbing grooves 3072, the shock-absorbing grooves 3072 are used for shock absorption between the telescopic rod 307 and the isolation sleeve 308.

[0066] The right end of the telescopic rod 307 is internally provided with a female pin base 312, the female pin base 312 is fixed through a compression ring 313 at the right side, and the female pin 314 is located inside the female pin base 312. The left end of the female pin base 312 is connected with the socket rod 309, the socket rod 309 is externally provided with a compression spring 310, and the compression spring 310 is located between the left end of the female pin base 312 and the stepped surface of the telescopic rod 307. The right end of the socket rod 309 is externally provided with two opposite anti-rotation grooves 3091, the anti-rotation grooves 3091 correspond to the fixing holes 3073 on the telescopic rod 307, a fixing pin is connected and fixed in the fixing holes 3073, and the end of the fixing pin is located in the anti-rotation grooves 3091, so as to prevent the socket rod 309 and the telescopic rod 307 from rotating relative to each other. The right end of the female pin base 312 is externally provided with a sealing ring A 315, which is used to ensure the sealing when the female pin base 312 is connected with the lower connecting assembly 5.

[0067] The material of the wear-resistant protection probe 304 is selected as wear-resistant material, which mainly plays a role in protecting the rear-end extension probe 305, the isolation sleeve 308 and the protection cap 311, and when wear occurs, the wear-resistant protection probe 304 is worn first, thereby improving the service life of other parts.

[0068] The right end of the single-core pin 2 is connected with the first section of wire, the right end of the first section of wire is sequentially connected with the female pin 314 after passing through the extension probe 305, the telescopic rod 307, the socket rod 309 and the female pin socket 311, and the length of the first section of wire needs to be ensured to be connected with the isolation sleeve 308 under the longest length. The length of the isolation sleeve 308 is selected according to the following method: in order to ensure the longer service life of the measurement-while-drilling drill collar 4, the isolation sleeve 308 needs to be replaced many times during use, so the length of the isolation sleeve 308 is provided with multiple specifications of 1.2in, 2.2in, 3.2in, 4.2in, 5.2in, 6.2in, 7.2in and 8.2in according to needs, and each time the isolation sleeve 308 is replaced with a size, the shock-absorbing ring 306, the telescopic rod 307, the socket rod 309, the compression spring 310, the protection cap 311, the female pin base 312, the compression ring 313, the female pin 314 and the sealing ring A 315 as a whole move rightward or leftward by a corresponding size, so as to ensure that the distance between the right end surface of the protection cap 311 and the end surface of the right-end male thread of the measurement-while-drilling drill collar 4 is between 1±0.4in, thereby ensuring the best matching size and enabling the measurement-while-drilling drill collar 4 to continue to be used after being replaced.

[0069] As Figures 6 to 12As shown, the lower connection assembly 5 includes a lower connection drill collar 501 connected with the left end of the MWD drill collar 4 through internal threads. The lower connection drill collar 501 is internally provided with an adapter 502, and a conductive ring 510 is fixed on the right end face of the lower connection drill collar 501, and the adapter 502 is connected with the conductive ring 510 through a wire. The left end of the adapter 502 is located inside the female pin base 312, and the adapter 502 is connected with the female pin base 312 through a female pin 314. A sealing ring B 512 is arranged between the adapter 502 and the female pin base 312, and the right end of the adapter 502 is connected with an adapter base 503.

[0070] The right end of the adapter base 503 is connected with a flow guide base 506, and a sealing ring B 506 is arranged at the connection position. The flow guide base 506 is located inside the lower connection drill collar 501, and the flow guide base 506 is a stepped cylinder in the axial direction, and the diameter of the left segment is smaller than that of the right segment. The outer surface of the right segment is in contact with the inner wall of the lower connection drill collar 501, and a sealing ring C 507 is arranged on the contact surface. A flow guide base compression ring 504 is arranged on the left side of the right segment, which can compress the flow guide base 506 on the stepped inner wall of the lower connection drill collar 501 to prevent movement. The flow guide base compression ring 504 can be selected in different lengths according to different working conditions. The length size reserves 2in, 1in, 0.5in, 0.25in and 0.125in multiple specifications, which can be combined according to needs, and then installed in the inner hole of the lower connection drill collar 501.

[0071] A drill collar vertical hole 5011 is arranged on the side wall of the lower connection drill collar 501, and the drill collar vertical hole 5011 is located at the right segment of the flow guide base 506, and an anti-rotation ring 509 is arranged in the drill collar vertical hole 5011. An axial horizontal hole 5013 is arranged on the right end side wall of the lower connection drill collar 501, which is parallel to the axis of the lower connection drill collar 501 and eccentric relative to the axis. One end of the horizontal hole 5013 is communicated with the drill collar vertical hole 5011 through an inclined hole 5012, and the other end is communicated with a groove on the right end face of the lower connection drill collar 501. The conductive ring 510 is located in the groove on the right end face of the lower connection drill collar 501.

[0072] The inner center hole 5061 of the flow guide seat 506 is axial and is opened at the center of the flow guide seat 506, and the vertical hole 5062 of the flow guide seat is perpendicular to the center hole 5061, the end of the vertical hole 5062 of the flow guide seat is located on the outer surface of the flow guide seat 506 and communicates with the vertical hole 5011 of the drill collar, the anti-rotation ring 509 is connected behind the vertical hole 5011 of the drill collar, and the end thereof is located in the vertical hole 5062 of the flow guide seat 506, so that the rotation of the flow guide seat 506 relative to the lower connecting drill collar 501 is prevented. In order to ensure that the anti-rotation ring 509 is not deformed, an anti-rotation ring is also arranged on the side wall of the lower connecting drill collar 501, and the anti-rotation ring 509 passes through the through hole in the side wall of the lower connecting drill collar 501 and is connected to the outer wall of the flow guide seat 506. An axial flow guide channel 5063 is arranged on the right cylindrical surface of the flow guide seat 506, so that the internal channel of the tool is unobstructed.

[0073] The left end of the adapter 502 is connected with the female pin 314, and the right end of the adapter 502 is connected with the second section of the wire, which has a length of 35-40 cm and passes through the inner hole of the left end of the adapter base 503, and then the adapter 502, the adapter base 503 and the flow guide seat 506 are sequentially connected together and are tightened to the specified torque by using a wrench. The right end of the second section of the wire sequentially passes through the center hole 5061 of the flow guide seat 506 and the vertical hole 5062 of the flow guide seat, and the end thereof is located outside the vertical hole 5062 of the flow guide seat, and the distance between the top end of the wire and the top end of the vertical hole 5062 is 8-12 cm, and then the wire is bent so as not to be higher than the top end of the vertical hole 5062, so as to prevent the wire from being damaged when the flow guide seat 506 is sent into the lower connecting drill collar 501.

[0074] The left end of the conductive ring 510 is connected with the third section of the wire, the left end of the third section of the wire sequentially passes through the horizontal hole 5013, the inclined hole 5012 and the vertical hole 5011 of the lower connecting drill collar 501, and the end of the third section of the wire is welded with the second section of the wire, and after the two sections of the wire are connected, the cover plate 508 is tightened on the lower connecting drill collar 501 by the fixing bolt 511, so that the circuit transmission of the tool is realized.

[0075] The adapter 502 is selected according to different working conditions, and the appropriate adapter 502 is selected according to the following method: in order to ensure that the length adjusting assembly 3 and the lower connection assembly 5 are connected, the adapter 502 and the female pin 314 are in compression fit, and the compression amount is 0.5-1.5in, which requires matching different specifications of the adapter 502, and the length size of the adapter 502 reserves 0.3in, 0.6in, 1in, 1.5in, 2in, 2.5in and 3in multiple specifications, so that the stability of the electrical connection can be ensured under strong vibration in the well. The length size of the adapter 502 can be adjusted to ensure that the lower connection drill collar 501 can still be used after the female buckle at the left end is repaired, so that the service life of the lower connection drill collar 501 is increased by 3-5 times.

[0076] A length adjusting device for a variety of MWD tools, the adjusting method first determines the buckle type of the upper connection probe pipe to select a matching adapter 1, and then connects the adapter 1 with the upper connection probe pipe. The adjusting device adjusts the method according to different tools, and the adjusting method further includes the following steps, as shown in the figure. It should be noted that in the following description, each length is calculated with the same unit unless otherwise specified: Figures 14 to 16

[0077] a, determine the length of the isolation sleeve 308: the length of the isolation sleeve 308 is determined according to the length between the right end face of the adapter 1 and the right end face of the MWD drill collar 4.

[0078] First, measure the length L1 between the right end face of the adapter 1 and the right end face of the MWD drill collar 4;

[0079] The length L10 of the isolation sleeve 308 is:

[0080] L10 = LI - L2 - L9 - L11 - L12

[0081] Wherein: L2 is the length from the right end face of the protection cap 311 to the right end face of the MWD drill collar 4; L9 is the length between the left step end face and the right end face of the wear-resistant protection pipe 304; L11 is the length of the protection cap 311; L12 is the length from the left step face to the right end face of the extension probe pipe 305.

[0082] The above L9, L11 and L12 can be determined from the drawing, wherein L2 = L1 - L8, and L8 is the length measured from the right end face of the adapter 1 to the right end face of the protection cap 311. L8 can also be determined from the drawing.

[0083] According to the calculated length L10 of the isolation sleeve 308, select the appropriate isolation sleeve.

[0084] ​b. Determine the length of the adapter 502: The length of the adapter 502 is determined according to the distance L15 between the step surface at the right end of the measurement-while-drilling drill collar 4 and the right end surface of the female pin 314.

[0085] First, measure the length L15 from the step surface at the right end of the measurement-while-drilling drill collar 4 to the right end surface of the female pin 314;

[0086] Let the distance from the pin end surface of the adapter 502 to the left end surface of the lower connecting drill collar 501 be L16. Since the adapter 502 and the female pin 314 are in a tight compression fit with a compression amount of 0.5 - 1.5 in, therefore, it should be ensured that 0.5 in < L15 - L16 < 1.5 in.

[0087] The length L13 of the adapter 502 is:

[0088] L13 = L14 - L16 + L5

[0089] In the formula: L14 is the length between the left end surface of the lower connecting drill collar 501 and the left end surface of the adapter base 503, which can be determined through the drawing; L5 is the length from the pin end surface of the adapter to the bottom of the pin, which can be determined through the drawing.

[0090] To ensure 0.5 in < L15 - L16 < 1.5 in, therefore,

[0091] L13max = L14 - (L15 - 0.5) + L5

[0092] L13min = L14 - (L15 - 1.5) + L5

[0093] In the formula: L13max is the maximum length of the adapter, and L13min is the minimum length of the adapter.

[0094] c. Determine the length of the flow guide seat compression ring 504: The length of the flow guide seat compression ring 504 is determined according to the length that it extends into the lower connecting drill collar 501 when the measurement-while-drilling drill collar 4 is connected to the lower connecting drill collar 501.

[0095] First, measure the length L4 from the right side step end surface of the measurement-while-drilling drill collar 4 to the right end surface of the measurement-while-drilling drill collar 4. Then the length L7 of the flow guide seat compression ring 504 is:

[0096] L7 = L17 - L4 + YK1

[0097] In the formula: L17 is the length between the left end surface of the lower connecting drill collar 501 and the left end surface of the flow guide seat 506, which is determined through the drawing; YK1 is the compression length of the flow guide seat compression ring 504, usually 1 ± 0.2 in.

[0098] According to the calculated range of the length L7 of the guide base compression ring 504, one or more guide base compression rings 504 of different sizes are selected, and the overall length of the guide base compression ring 504 meets the calculated length L7.

[0099] When the device is adjusted, the final length of the length adjustment system required is obtained by measurement and calculation, and the appropriate length is matched by selecting the size of the adjustment ring in the length adjustment system, so that the compression amount of the length adjustment system is within 0.5-1.5in, and the internal male and female pins are always in a compressed state. After the length of each adjustment part is adjusted, the left end of the device is connected to the right end of the inner probe of the drilling instrument, and is tightened by a friction wrench. Then, the drill collar of the drilling measurement instrument and the connected drill collar are connected on the disassembly rack, and the threads are smeared with thread oil, and are tightened by the disassembly rack to the specified torque.

[0100] The above has described various embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical applications, or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A length adjustment device suitable for use with a variety of measurement-while-drilling instruments, comprising a swivel sub (1), a measurement-while-drilling collar (4), the swivel sub (1) being located inside the measurement-while-drilling collar (4), characterized in that: The right end of the adapter (1) is connected to the length adjustment assembly (3), and the adapter (1) and the length adjustment assembly (3) are connected by a single core pin (2). The right end of the measurement-while-drilling drill collar (4) is connected to the lower connection assembly (5). The length adjustment assembly (3) includes an anti-wear protection probe (304), inside which is provided a female pin bracket (301) connected to the single-core pin (2), and the right end of the anti-wear protection probe (304) is connected to an isolation sleeve (308) through an extension probe (305). Inside the isolation sleeve (308) is provided a telescopic rod (307), and inside the right end of the telescopic rod (307) is provided a female pin (314) connected to the lower connection assembly (5). The lower connection assembly (5) includes a lower connection drill collar (501), which is threadedly connected to the measurement-while-drilling drill collar (4) at the left end; an adapter (502) is provided inside the lower connection drill collar (501), which is connected to the female pin (314); a conductive ring (510) is fixed on the right end face of the lower connection drill collar (501); The isolation sleeve (308) and adapter (502) are selected with different lengths depending on the working conditions.

2. The length adjustment device suitable for use with a variety of MWD instruments of claim 1, wherein: The inner wall of the anti-wear protection probe (304) is provided with a step, and the outer surface of the female pin bracket (301) is provided with a boss. The boss of the female pin bracket (301) is located on the left side of the step of the anti-wear protection probe (304), and a compression spring (302) is provided between the two.

3. The length adjustment device suitable for use with a variety of MWD instruments of claim 2, wherein: The wear-resistant protective probe (304) has a guide tube (303) inside, and the right end of the female pin bracket (301) is located inside the guide tube (303).

4. The length adjustment device suitable for use with multiple MWD instruments of claim 1, wherein: The left end of the telescopic rod (307) is located inside the extension probe (305), and the outer surface of the left end of the telescopic rod (307) is provided with two opposing planar grooves (3071). A fixing hole (3073) is opened on the middle side wall of the telescopic rod (307); two opposing anti-rotation holes (3051) are opened on the side wall of the extension probe (305), and an anti-rotation pin is connected in the anti-rotation hole (3051), and the end of the anti-rotation pin is located in the planar groove (3071).

5. The length adjustment device suitable for use with a variety of MWD instruments of claim 4, wherein: The female pin (314) is located inside the female pin base (312), and the female pin base (312) is connected to the telescopic rod (307) through a clamping ring (313); the left end of the female pin base (312) is connected to the socket rod (309), and a clamping spring (310) is provided between the left end of the female pin base (312) and the stepped surface of the telescopic rod (307).

6. The length adjustment device suitable for use with a variety of MWD instruments of claim 5, wherein: The outer surface of the right end of the socket rod (309) is provided with two opposing anti-rotation grooves (3091). The anti-rotation grooves (3091) correspond to the fixing holes (3073) on the telescopic rod (307). The fixing holes (3073) are connected to fixing pins, and the ends of the fixing pins are located in the anti-rotation grooves (3091).

7. The length adjustment device suitable for use with a variety of MWD instruments of claim 1, wherein: The adapter (502) is connected to the adapter base (503), the adapter base (503) is connected to the flow guide (506), the flow guide (506) is located inside the lower connected drill collar (501), and the left side of the flow guide (506) is fixed by the flow guide clamping ring (504).

8. The length adjustment device applicable to various drilling measurement instruments according to claim 7, characterized in that: The flow guide seat (506) is fixed to the side wall of the lower connecting drill collar (501) by an anti-rotation ring (509) to prevent the flow guide seat (506) from rotating.

9. The length adjustment device applicable to various drilling measurement instruments according to claim 8, characterized in that: The lower connecting drill collar (501) has a vertical drill collar hole (5011) on its side wall, and the anti-rotation ring (509) is located inside the vertical drill collar hole (5011). The lower connecting drill collar (501) has an axial horizontal hole (5013) on its right side wall. One end of the horizontal hole (5013) is connected to the vertical drill collar hole (5011) through an inclined hole (5012), and the other end is connected to the groove on the right end face of the lower connecting drill collar (501). The conductive ring (510) is located inside the groove on the right end face of the lower connecting drill collar (501).

10. The length adjustment device applicable to various drilling measurement instruments according to claim 9, characterized in that: The guide seat (506) has a central inner hole (5061) and a guide seat vertical hole (5062) that are connected. The guide seat vertical hole (5062) corresponds to the drill collar vertical hole (5011). The end of the anti-rotation ring (509) is located inside the guide seat vertical hole (5062).

11. The length adjustment device applicable to various drilling measurement instruments according to claim 10, characterized in that: The flow guide seat (506) has an axial flow guide channel (5063).

12. The length adjustment device applicable to various drilling measurement instruments according to claim 7, characterized in that: The length of the flow guide seat clamping ring (504) is selected according to different working conditions.

13. The length adjustment device applicable to various drilling measurement instruments according to any one of claims 1-12, characterized in that: The right end of the single-core pin (2) is connected to the first section of wire. The right end of the first section of wire passes through the extension probe (305), the telescopic rod (307), the socket rod (309), and the female pin socket (311) in sequence and is then connected to the female pin (314). The right end of the adapter (502) is connected to the second wire. The right end of the second wire passes through the adapter base (503), the central inner hole (5061) of the guide seat (506), and the vertical hole (5062) of the guide seat in sequence, and its end is located outside the vertical hole (5062) of the guide seat. The left end of the conductive ring (510) is connected to the third section of wire. The left end of the third section of wire passes through the horizontal hole (5013), the inclined hole (5012), and the vertical hole (5011) of the lower drill collar (501) in sequence, and then its end is welded to the second section of wire.

14. The adjustment method of the length adjustment device applicable to various drilling measurement instruments according to any one of claims 1-12, characterized in that... include: a. Determine the length of the isolation sleeve (308): The length of the isolation sleeve (308) is determined based on the length between the right end face of the adapter (1) and the right end face of the measuring drill collar 4. b. Determine the length of the adapter (502): The length of the adapter (502) is determined based on the distance (L15) between the right end step surface of the drill collar (4) and the right end surface of the female insert (314) during drilling. c. Determine the length of the guide seat clamping ring (504): The length of the guide seat clamping ring (504) is determined based on the length of the drill collar (4) that extends into the lower connecting drill collar (501) when it is connected to the measuring drill collar (4) during drilling.

15. The adjustment method of the length adjustment device applicable to various drilling measurement instruments according to claim 14, characterized in that: In step a, the length L1 between the right end face of the adapter (1) and the right end face of the measuring drill collar 4 is first measured. The length L10 of the isolation sleeve (308) is: L10 = L1 - L2 - L9 - L11 - L12 In the formula: L2 is the length from the right end face of the protective cap (311) to the right end face of the measuring drill collar (4) during drilling; L9 is the length between the left step end face and the right end face of the anti-wear protective tube (304); L11 is the length of the protective cap (311); L12 is the length from the left step face to the right end face of the extension probe (305).

16. The adjustment method of the length adjustment device applicable to various drilling measurement instruments according to claim 14, characterized in that: In step b, the length L15 from the right end step surface of the measuring drill collar (4) to the right end surface of the female insert (314) is measured. Let L16 be the distance from the pin end face of the adapter (502) to the left end face of the lower connecting drill collar (501), then 0.5in <L15-L16<1.5in; The length L13 of the adapter (502) is: L13 = L14 - L16 + L5 In the formula: L14 is the length between the left end face of the lower connecting drill collar (501) and the left end face of the adapter base (503); L5 is the length from the end face of the adapter pin to the bottom of the pin.

17. The adjustment method for the length adjustment device applicable to various drilling measurement instruments according to claim 16, characterized in that: Maximum length of adapter (502): L13max = L14 - (L15 - 0.5) + L5 Minimum length of adapter (502): L13min=L14-(L15-1.5)+L5.

18. The adjustment method for the length adjustment device applicable to various drilling measurement instruments according to claim 14, characterized in that: In step c, the length L4 from the right step end face of the measurement-while-drilling (MWD) drill collar (4) to the right end face of the MWD drill collar (4) is first measured, and the length L7 of the guide seat clamping ring (504) is: L7 = L17 - L4 + YK1 In the formula: L17 is the length of the left end face of the guide seat (506) on the left end face of the lower connecting drill collar (501); YK1 is the compression length of the guide seat clamping ring (504).

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