Flexible instrument for track-controllable ultra-short radius drilling track measurement

Abstract

The utility model relates to the technical field of petroleum supporting facilities, and provides a flexible instrument for track-controllable ultra-short radius drilling track measurement, which comprises a pulse assembly, a battery assembly and an exploring tube (mainly the pulse assembly, the battery assembly and the exploring tube) assembly, and the exploring tube assembly integrates a digital orientation module, an output power supply module and a main processor unit. The gamma probe tube is connected to one end of the probe tube assembly, the pulser is connected to one end of the gamma probe tube, the connecting assembly is connected to the tail end of the pulser, and the connecting assembly comprises a mushroom head, a lifting rod, a guide shoe, a supporting sleeve, a wear-resistant sleeve, a main spring, a spring outer sleeve, a piston cap and the like. By means of the technical scheme, the problem that in the prior art, a conventional MWD can pass through a dog leg at the maximum of about 48 degrees, and the short-radius / ultra-short-radius inclinometry requirement cannot be met is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum supporting facilities, and in particular to a flexible instrument for measuring a trajectory of a controllable ultra-short radius drilling well. Background Art

[0002] Flexible MWD (MWD means "Measure While Drilling", which originally means measuring wellbore trajectory parameters while drilling, including: well inclination, azimuth, tool face angle and auxiliary parameters such as temperature, etc.) consists of two parts: ground equipment and downhole measuring instruments. Ground equipment includes: pressure sensor, special data processor, remote data processor, computer and related connecting cables, etc. Downhole measuring instruments mainly consist of directional probe (directional parameter measurement short section), gamma probe, mud pulse generator, battery, centralizer, fishing head, etc.

[0003] The data measured by the instrument in the well are encoded in a certain way by the directional probe to generate a pulse signal. The pulse signal drives the servo valve head to move precisely through the drive circuit inside the pulser, and uses the circulating mud to make the signal valve head of the guide assembly move synchronously, thereby causing the circulating mud in the drill pipe to produce pressure changes. The ground decoding equipment restores the pulse signal in the well through the change of mud pressure in the riser detected by the pressure sensor, and then obtains various data in the well.

[0004] The maximum dogleg angle of conventional MWD is about 48 degrees, which cannot meet the needs of short radius / ultra-short radius inclination measurement. In view of this, a flexible instrument for trajectory controllable ultra-short radius drilling trajectory measurement is developed. Utility Model Content

[0005] The utility model provides a flexible instrument for trajectory controllable ultra-short radius drilling trajectory measurement, which solves the problem that the conventional MWD in the related art has a maximum passing dogleg of about 48 degrees and cannot meet the short radius / ultra-short radius inclination measurement requirements.

[0006] The technical solution of the utility model is as follows:

[0007] Probe assembly, which integrates a digital directional module, an output power module and a main processor unit;

[0008] A gamma probe tube connected to one end of the probe tube assembly;

[0009] A pulser connected to one end of the gamma probe;

[0010] A connecting component connected to a terminal end of the pulser;

[0011] The connecting assembly includes: a mushroom head, a lifting rod, a guide shoe, a support sleeve, a wear-resistant sleeve, a main spring, a spring jacket and a piston cap;

[0012] The mushroom head is the end of the connecting assembly, the lifting rod is arranged at one end of the mushroom head, the guide shoe is sleeved on the lifting rod, a gap is left between the guide shoe and the lifting rod, the support sleeve is arranged on one side of the guide shoe, the wear-resistant sleeve is arranged at the end of the lifting rod, the spring sleeve is connected to one end of the support sleeve, the main spring is connected to the wear-resistant sleeve, the main spring is arranged inside the spring sleeve, and the piston cap is arranged between the main spring and the lifting rod.

[0013] As a further technical solution, the assembly sequence is: lower component → pulser → Coupling → gamma probe → Coupling → probe assembly → Coupling → battery → salvage head.

[0014] As a further technical solution, the gamma probe tube is provided with an inclined groove, the inclined groove is provided with a guide groove, and the end of the gamma probe tube is provided with a plurality of through holes.

[0015] The working principle and beneficial effects of the utility model are:

[0016] The maximum dogleg of conventional MWD in the utility model is about 48 degrees, which cannot meet the needs of short radius / ultra-short radius inclinometric measurement. The ultra-short flexible MWD design concept adds a flexible short section and flexibly designs and processes conventional components, thereby increasing the maximum dogleg of the instrument from 45 degrees / 30 meters to 108 degrees / 30 meters, thereby increasing flexibility and bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 This is an isometric view of the probe tube assembly of the utility model;

[0019] Figure 2 This is an explosion diagram of the gamma probe tube of the utility model;

[0020] Figure 3 This is the isometric view of the pulser of the utility model;

[0021] Figure 4 It is a cross-sectional view of the connection assembly of the utility model;

[0022] Figure 5 This is a partial enlarged view of the connection component of the utility model;

[0023] In the figure: 1. Probe assembly; 2. Gamma probe; 3. Pulser; 4. Connecting assembly; 4-1. Mushroom head; 4-2. Lifting rod; 4-3. Guide shoe; 4-4. Support sleeve; 4-5. Wear-resistant sleeve; 4-6 Main spring; 4-7. Spring outer sleeve; 4-8. Piston cap; 5. Bevel groove; 6. Guide groove; 7. Through hole. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figure 1 to Figure 5 As shown, this embodiment proposes a flexible instrument for trajectory controllable ultra-short radius drilling trajectory measurement, including

[0026] Probe assembly, which integrates a digital directional module, an output power module and a main processor unit;

[0027] A gamma probe tube connected to one end of the probe tube assembly;

[0028] A pulser connected to one end of the gamma probe;

[0029] A connecting component connected to a terminal end of the pulser;

[0030] The connecting assembly includes: a mushroom head, a lifting rod, a guide shoe, a support sleeve, a wear-resistant sleeve, a main spring, a spring jacket and a piston cap;

[0031] The mushroom head is the end of the connecting assembly, the lifting rod is arranged at one end of the mushroom head, the guide shoe is sleeved on the lifting rod, a gap is left between the guide shoe and the lifting rod, the support sleeve is arranged on one side of the guide shoe, the wear-resistant sleeve is arranged at the end of the lifting rod, the spring sleeve is connected to one end of the support sleeve, the main spring is connected to the wear-resistant sleeve, the main spring is arranged inside the spring sleeve, and the piston cap is arranged between the main spring and the lifting rod.

[0032] Specifically, the assembly sequence is: lower component → pulser → coupling → gamma probe → coupling → probe assembly → coupling → battery → salvage head, the gamma probe is provided with an inclined groove, the inclined groove is provided with a guide groove, and the end of the gamma probe is provided with a plurality of through holes.

[0033] In this embodiment, the probe tube assembly, the directional probe tube short section integrates a digital directional module, an output power module and a main processor unit (MPU), which can provide accurate and continuous measurement data with very little power consumption, and the serial port sensor can be directly connected to the microprocessor.

[0034] The real-time rotation detection function of the MPU will detect the rotation status in real time and automatically, and control the transmission data to seamlessly switch between the directional sequence and the rotation sequence in real time without the help of the rotation flag. It can transmit the data required by the driller faster and more timely, and improve the drilling rate.

[0035] MPU's dynamic well deviation gives the well deviation data of the MWD tool during sliding drilling. Although strong earthquakes and shocks can seriously affect the accuracy of dynamic well deviation, KeyDrill's new technology can greatly improve the reliability and accuracy of dynamic well deviation. Dynamic well deviation data allows us to detect the drilling trajectory more accurately and timely to meet the design requirements.

[0036] Gamma probe, rotation / azimuth imaging gamma sub (KRG) can detect and transmit four quadrants of open hole gamma ray spectrum images (high side gamma, low side gamma, left quadrant gamma, right quadrant gamma) in real time. It also provides accurate total gamma and near-bit well deviation. Gamma spectrum can provide geological guidance and formation structure information, which has special application value for shale oil and coalbed methane development.

[0037] The azimuth gamma window can be set arbitrarily between 30° and 120°. The smaller the window, the higher the azimuth gamma resolution and the more accurate the judgment. The window we are using is currently set to 90° (45° left and right of the vertical axis). The KeyDrill gamma probe has its own opening and does not need to calibrate the high side (unlike the directional probe, which needs to calibrate the high side). The center of its window is its high side (gravity is used to determine the azimuth gamma). When it is not rotating, except for the direction in which the window faces, all other directions are 1 (KeyDrill azimuth gamma, which defaults to 1 when no value is measured). If the window is facing upward, the upper gamma value is non-1 (the measured true value will be displayed), and the lower gamma and left and right gamma are all 1.

[0038] KeyDrill gamma detection distance range is 12-18 inches (30-45cm), and the detection distance of the 306° rotational dynamic gamma measurement of total gamma is consistent with the azimuth gamma.

[0039] Pulser, KeyDrill positive pulse generator (PSP) converts MWD recorded information into pressure signal, which is transmitted by the pressure difference formed in the drill pipe by the mushroom head moving back and forth at the restrictor ring position. The surface sensor sends the detected pressure signal to the receiving device for decoding.

[0040] KeyDrill piston compensated stepper motor pulser is driven by a stepper motor. It restricts or opens the flow of mud in the casing through the reciprocating motion of the mushroom head, and converts the downhole data into a series of pressure pulses to transmit to the ground receiver. This pulser can be salvaged and is fully compatible with the QDT-Tensor series MWD instruments, and can replace all QDT-Tensor series pulsers. The piston compensated stepper motor pulser has excellent corrosion resistance to oil, lubricant, acidic oil and gas, and various corrosive muds.

[0041] In the connection component:

[0042] Mushroom head: Located in a position where the mud flow area is contracted, it is very easy to be eroded. Check the outer diameter of the mushroom head. If the outer diameter decreases by more than 1mm, it should be replaced; check the bottom of the mushroom head. If the bottom is severely eroded, it needs to be replaced. At the same time, pay attention to check whether there are cracks on its appearance. If there are, it needs to be replaced. When tightening the mushroom head, first apply thread glue, and tighten it with a torque wrench according to the standard torque. Do not use too much force, which may cause cracks in the mushroom head and make it unusable;

[0043] Guide shoe: When inspecting on the ground, first check the wear and erosion of the guide sleeve and wear ring. If the erosion exceeds 3-5mm, it must be replaced. At the same time, check whether the sealing O-ring under the wear sleeve is intact. If the connection between the guide groove and the guide key is eroded and deformed, the guide must be replaced;

[0044] Y-shaped sealing ring: When rubbing against the wear-resistant sleeve during operation, the Y-shaped ring should be free of deformation, intact in appearance, and elastic. When the Y-shaped ring has or is suspected of having flanges, burrs, aging, inelasticity, or softening, the Y-shaped ring should be replaced. The Y-shaped rings should be installed back to back with the openings facing outwards (the upper one facing up, the lower one facing down);

[0045] Lifting rod: Check whether there is erosion at the lower end of the lifting rod. It cannot be eroded into a mushroom shape, and there must be no erosion marks. The end face must be smooth, and the end face cannot be eroded by 1mm. If the hollow lifting rod is eroded, it must be scrapped.

[0046] Main spring, main spring outer tube: Check the main spring and observe carefully whether it is eroded, corroded or worn. If there is erosion, corrosion or wear, it should be replaced in time. Check the wear-resistant sleeve and observe carefully whether there is any trace of erosion or crack. If there is any trace of erosion or crack, the wear-resistant sleeve must be replaced. Observe the main spring outer tube. If the mud hole is eroded, the main spring outer tube must be replaced. If the mud hole is eroded, the probability of erosion of the internal piston cap is very high, so please pay attention. After assembling the spring, piston and wear-resistant sleeve, push the large piston by hand. It should not feel astringent (indicating that the force used for pushing in is roughly the same as that used for ejecting);

[0047] Main spring, main spring outer cylinder: Check the main spring and carefully observe whether it is eroded, corroded, or worn. If there is erosion, corrosion, or wear, it should be replaced in time. Check the wear sleeve and carefully observe whether there are erosion marks or cracks. If there are erosion marks or cracks, the wear sleeve must be replaced. Observe the main spring outer cylinder. If the mud hole is eroded, the main spring outer cylinder must be replaced. If the mud hole is eroded, the probability of the internal piston cap being eroded is very high, so pay attention. After assembling the spring, piston, and wear sleeve, push the large piston by hand, and it should not feel astringent (indicating that the force when pushing in is roughly the same as when ejecting).

[0048] The KeyDrill probe encodes the measured downhole parameters in a specific way to generate a control signal. The control signal controls the up and down movement of the pulser valve head, and then uses the energy of the mud flow to make the mushroom head produce corresponding up and down movement, thereby changing the local flow area between the mushroom head and the limiting ring. The control signal generated by the probe controls the time of the mushroom head being lifted or lowered, thereby controlling the width and interval of the pulse. The mud flow cross-sectional area between the mushroom head and the limiting ring determines the strength of the signal. We can control the signal strength by selecting the outer diameter of the mushroom head and the inner diameter of the limiting ring to make it suitable for working environments with different wellbores, different displacements, and different well depths. The whole process involves how to obtain data underground and how to transmit this data to the ground. These two functions are completed by the probe and the mud pulse generator respectively.

[0049] When disassembling or replacing an old battery, you must start disassembly from the top of the battery: remove the vent screw → loosen the sleeve on the top of the battery outer tube and the conversion connector with the vent (just loosen, do not completely remove) → remove the sleeve on the top of the battery outer tube → withdraw the six-pin four-hole conversion connector on the top of the battery, so that the wire ends on the top of the battery are in a free and active state → remove the conversion connector with the vent → remove the bottom of the battery outer tube → remove the battery-specific insulating tape → remove the battery fastening screws → take out the old battery. What needs to be noted during the entire disassembly process is that you must not start disassembly from the bottom of the battery outer tube, as this will inevitably damage the wire ends on the top of the battery.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible instrument for trajectory controllable ultra-short radius drilling trajectory measurement, characterized in that: include Probe assembly, which integrates a digital directional module, an output power module and a main processor unit; A gamma probe tube connected to one end of the probe tube assembly; A pulser connected to one end of the gamma probe; A connecting component connected to a terminal end of the pulser; The connecting assembly includes: a mushroom head, a lifting rod, a guide shoe, a support sleeve, a wear-resistant sleeve, a main spring, a spring jacket and a piston cap; The mushroom head is the end of the connecting assembly, the lifting rod is arranged at one end of the mushroom head, the guide shoe is sleeved on the lifting rod, a gap is left between the guide shoe and the lifting rod, the support sleeve is arranged on one side of the guide shoe, the wear-resistant sleeve is arranged at the end of the lifting rod, the spring sleeve is connected to one end of the support sleeve, the main spring is connected to the wear-resistant sleeve, the main spring is arranged inside the spring sleeve, and the piston cap is arranged between the main spring and the lifting rod.

2. A flexible instrument for trajectory controllable ultra-short radius drilling trajectory measurement according to claim 1, characterized in that: The assembly sequence is: lower component → pulser → coupling → gamma probe → coupling → probe assembly → coupling → battery → salvage head.

3. The flexible instrument for trajectory controllable ultra-short radius drilling trajectory measurement according to claim 1, characterized in that: The gamma probe tube is provided with an inclined groove, the inclined groove is provided with a guide groove, and the end of the gamma probe tube is provided with a plurality of through holes.

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