A drilling-while-drilling electrical imaging matrix assembly

Abstract

The utility model discloses a drilling-while-electrical imaging substrate assembly, comprising a drilling-while-electrical imaging main substrate, a sensor hatch is provided in the middle of the drilling-while-electrical imaging main substrate, an electric imaging assembly is provided in the sensor hatch, REIT flow channel converters are inserted at both the front and rear ends of the drilling-while-electrical imaging main substrate, a substrate front section is installed at the front end of the drilling-while-electrical imaging main substrate, and a substrate rear section is installed at the rear end of the drilling-while-electrical imaging main substrate. The utility model relates to the technical field of downhole surveying. The drilling-while-electrical imaging substrate assembly has a simple structure, is easy to manufacture, disassemble and maintain, can be used to conduct surveying work in-depth, judge the straightness of the well path, analyze the situation in the well through relevant sensors in the electric imaging assembly, and form a visual survey result, which is mainly used for detecting distance.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole surveying, in particular to a drilling-while-drilling electrical imaging matrix assembly. Background Art

[0002] As the exploration of oil and gas resources in the world increases, newly discovered oil and gas reservoirs tend to be smaller in scale and more complex in reservoir properties and structural morphology. The application of traditional conventional exploration technology and equipment to discover and evaluate such oil and gas reservoirs increases exploration costs and reduces benefits. Geologists and logging analysts have long dreamed of taking a camera to roam in the wellbore and carefully examine the underground stratum structure and fluid distribution. To this end, logging personnel have struggled for 70 years, and logging technology has also gone through four stages: analog logging, digital logging, CNC logging, and now push-pull assembly electrical imaging logging.

[0003] In order to better carry out downhole exploration work, the drilling electrical imaging assembly is a necessary equipment for deep well work. The current logging instrument drilling electrical imaging assembly has a complex structure, which not only increases the cost of use, but also is not conducive to production and maintenance. Therefore, a simple structure push-to-pull device is needed to better help people carry out exploration work. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a drilling-while-electrical imaging substrate assembly, which solves the problem that the prior substrate assembly structure is relatively complex.

[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a drilling-while-electrical imaging substrate assembly, including a drilling-while-electrical imaging main substrate, a sensor hatch is opened in the middle of the drilling-while-electrical imaging main substrate, an electrical imaging assembly is arranged in the sensor hatch, REIT flow channel converters are inserted at both the front and rear ends of the drilling-while-electrical imaging main substrate, a substrate front section is installed at the front end of the drilling-while-electrical imaging main substrate, and a substrate rear section is installed at the rear end of the drilling-while-electrical imaging main substrate.

[0006] Preferably, the front section of the base body includes an upper transfer drill collar, which is arranged on the front side of the main base body of the electrical imaging while drilling, and the REIT flow channel converter close to the front side is inserted into the upper transfer drill collar. An upper small copper ring is arranged between the upper transfer drill collar and the outer wall of the main base body of the electrical imaging while drilling, and a first wear-resistant sleeve base is installed at the tail end of the upper small copper ring. The first wear-resistant sleeve base is arranged on the outer ring surface of the main base body of the electrical imaging while drilling, and a plurality of upper guard rings are arranged between the main base body of the electrical imaging while drilling and the inner wall of the upper transfer drill collar and close to the front side.

[0007] Preferably, a winding bracket is provided on the outer annular surface of the main substrate of the while drilling electrical imaging and between the sensor hatch and the front section of the substrate, and a coil protection cover is provided on the outer side of the winding bracket, and the coil protection cover is connected to the outer wall of the main substrate of the while drilling electrical imaging.

[0008] Preferably, the rear section of the base body includes a lower transfer drill collar, which is arranged at the tail end of the main base body of the electrical imaging while drilling, and the REIT flow channel converter close to the rear side is inserted in the lower transfer drill collar. A plurality of lower protective rings are provided between the main base body of the electrical imaging while drilling and the inner wall of the lower transfer drill collar. A lower copper ring is arranged between the front end of the lower transfer drill collar and the outer wall of the main base body of the electrical imaging while drilling, and a circuit housing and a second wear-resistant sleeve base are successively installed on the front side of the lower copper ring, and the circuit housing and the second wear-resistant sleeve base are both mounted on the outer ring surface of the main base body of the electrical imaging while drilling.

[0009] Preferably, a front cover plate is inserted on the outer annular surface of the main body of the drilling electrical imaging system and is located between the sensor hatch and the rear section of the body. Beneficial Effects

[0010] The utility model provides a drilling-while-electrical imaging matrix assembly, which has the following beneficial effects: the drilling-while-electrical imaging matrix assembly has a simple structure, is easy to manufacture, disassemble and repair, can be used to conduct in-depth survey work, determine the straightness of the well path, analyze the situation in the well through the relevant sensors in the electrical imaging assembly, and form a visual survey result. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 It is a cross-sectional structural schematic diagram of the utility model.

[0013] Figure 3 It is a schematic diagram of the front partial structure of the utility model.

[0014] Figure 4 It is a schematic diagram of the rear partial structure of the utility model.

[0015] Figure 5 It is a partial structural schematic diagram of the utility model.

[0016] Figure 6 It is a schematic diagram of the cut surface of the utility model.

[0017] Figure 7 It is a schematic diagram of the hole depth of the utility model.

[0018] Figure 8 It is a cross-sectional schematic diagram of the drilling tooling of the utility model.

[0019] Fig. 9 It is a schematic cross-sectional view of the drilling tooling of the present utility model.

[0020] Fig.10 It is a schematic diagram of the righting sleeve of the utility model.

[0021] In the figure: 1. main body of the LWD electrical imaging system; 2. sensor hatch; 3. REIT flow channel converter; 4. upper transfer drill collar; 5. small copper ring; 6. first wear-resistant sleeve base; 7. upper protective ring; 8. winding bracket; 9. coil protection cover; 10. lower transfer drill collar; 11. lower protective ring; 12. lower copper ring; 13. second wear-resistant sleeve base; 14. circuit housing; 15. front cover plate. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in 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 in 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.

[0023] Through the personnel in this field, all the electrical components in this case are connected to their corresponding power supplies through wires, and a suitable controller should be selected according to the actual situation to meet the control requirements. The specific connection and control sequence should refer to the following working principle, and the electrical connection between the electrical components is completed in the order of working in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and does not explain the electrical control.

[0024] See also Figure 1-4 The utility model provides a technical solution: a drilling-while-electrical imaging substrate assembly, comprising a drilling-while-electrical imaging main substrate 1, a sensor hatch 2 is opened in the middle of the drilling-while-electrical imaging main substrate 1, an electric imaging assembly is arranged in the sensor hatch 2, a REIT flow channel converter 3 is inserted at both the front and rear ends of the drilling-while-electrical imaging main substrate 1, a substrate front section is installed at the front end of the drilling-while-electrical imaging main substrate 1, and a substrate rear section is installed at the rear end of the drilling-while-electrical imaging main substrate 1;

[0025] Specifically, the device has a simple structure and is easy to manufacture, disassemble and repair. It can conduct in-depth surveys to determine the straightness of the well path, analyze the situation in the well through relevant sensors in the electrical imaging assembly, and form visual survey results.

[0026] Embodiment 1: The front section of the base body includes an upper transfer drill collar 4, which is arranged on the front side of the main base body 1 of the while drilling electrical imaging, and the REIT flow channel converter 3 near the front side is inserted into the upper transfer drill collar 4. An upper small copper ring 5 is arranged between the upper transfer drill collar 4 and the outer wall of the main base body 1 of the while drilling electrical imaging, and a first wear-resistant sleeve base 6 is installed at the tail end of the upper small copper ring 5. The first wear-resistant sleeve base 6 is arranged on the outer ring surface of the main base body 1 of the while drilling electrical imaging, and a plurality of upper guard rings 7 are provided between the main base body 1 of the while drilling electrical imaging and the inner wall of the upper transfer drill collar 4 and near the front side.

[0027] A winding bracket 8 is provided on the outer annular surface of the main body 1 of the electrical imaging while drilling and between the sensor hatch 2 and the front section of the body. A coil protection cover 9 is provided on the outer side of the winding bracket 8. The coil protection cover 9 is connected to the outer wall of the main body 1 of the electrical imaging while drilling.

[0028] Embodiment 2: The rear section of the base body includes a lower transfer drill collar 10, which is arranged at the tail end of the main base body 1 of the while drilling electrical imaging, and the REIT flow channel converter 3 near the rear side is inserted in the lower transfer drill collar 10. A plurality of lower guard rings 11 are arranged between the main base body 1 of the while drilling electrical imaging and the inner wall of the lower transfer drill collar 10. A lower copper ring 12 is arranged between the front end of the lower transfer drill collar 10 and the outer wall of the main base body 1 of the while drilling electrical imaging, and a circuit housing 14 and a second wear-resistant sleeve base 13 are installed on the front side of the lower copper ring 12 in sequence, and the circuit housing 14 and the second wear-resistant sleeve base 13 are both mounted on the outer ring surface of the main base body 1 of the while drilling electrical imaging.

[0029] A front cover plate 15 is inserted on the outer annular surface of the main body 1 of the drilling electrical imaging system and is located between the sensor hatch 2 and the rear section of the body;

[0030] Specifically, electrical imaging logging generally consists of the following instruments: downhole integrated resistivity measuring instrument, data acquisition device, wellhead data processing and control instrument, data storage and imaging software.

[0031] The principle of electrical imaging logging is mainly based on the principle of resistivity measurement. By arranging electrodes in the wellbore, the conductivity is quantified through the resistivity sensor, and an imaging model is established based on this, and the conductivity of the inner wall of the wellbore is imaged through software.

[0032] Electrical imaging logging technology mainly includes two links: data acquisition and data processing. Data acquisition mainly collects the resistivity structure information of the inner wall of the wellbore, and data processing mainly processes the collected resistivity information of the inner wall of the wellbore into imaging data to provide information such as the horizontal position and resistivity distribution of various resistivity compounds.

[0033] Specific:

[0034] 1. When assembling the high-pressure needle sealing plug, pay attention to the protection of the sealing ring. After inserting it into the sealing hole, pull it out and check whether the sealing ring is damaged; so as not to affect the seal and damage the instrument.

[0035] 2. The resistivity sensor needs special protection. The sensor is an integrated component. If it is damaged, it must be replaced as a whole, which is expensive.

[0036] 3. When assembling or disassembling the instrument, the instrument must be fixed before operation to prevent it from falling and injuring the operator or damaging the instrument.

[0037] Example 3: The following are some processing details of the device:

[0038] 1. First, the diameter of the drill collar is relatively small, and the circumference of the gun drill is densely distributed, so the measurements interfere with each other, which affects the measurement of the hole position. On the other hand, the workpiece is long, and the gun drill hole requires a middle docking, and the position accuracy is strictly required, which increases the difficulty of hole correction.

[0039] 2. In the structure at a certain cross-section, the distance between the M4 threaded hole and the longitudinal gun drill hole is very close, about 2.8mm. The two holes are arranged on both sides of the longitudinal hole, which is 1207.5mm away from the inlet end of the gun drill hole. The straightness requirement of the gun drill hole is very high. The hole position needs to be accurately measured and corrected during processing. If the error is slightly larger, it will be tangent to the M4 hole. The processing here is very difficult.

[0040] 3. In the partial view Figure 7 In the figure, the distance between the 2-M4 threaded hole and the gun drill hole is about 2mm, and the wall thickness is about 2mm. The two holes are arranged on both sides of the gun drill hole with a distance of 55mm. This place is about 1200mm away from the entrance of the gun drill hole. The straightness requirement of the gun drill hole is very high. The hole position needs to be accurately measured and corrected during processing. If the error is slightly larger, it will intersect with the M4 hole, resulting in scrapping of the workpiece.

[0041] 4. In the circuit slot, partial view Figure 5 In the figure, the distance between the 2-M3 threaded hole and the gun drill hole is about 3mm, and the wall thickness is about 3mm. The two groups of holes are arranged on both sides of the gun drill hole, which is nearly 350mm away from the entrance of the gun drill hole. The straightness of the gun drill hole is required to be high. The hole position needs to be accurately measured and corrected during processing. If the error is slightly larger, it will intersect with the M3 hole.

[0042] 5. Figure 6 As shown, the sealing surface of the single-core seal and the wall thickness of the gun-drilled hole are 3.6mm. This place is more than 2 meters away from the inlet end of the gun-drilled hole. The requirements for the up and down offset of the gun-drilled hole are very strict. If the offset is too large, the wall thickness of the gun-drilled hole and the sealing hole will become thinner or connected, and the pressure resistance strength will not be achieved, which will cause great damage to the instrument. The straightness of the gun-drilled hole is very high.

[0043] 6. In the radially distributed cover plate groove, there are very high requirements for the position of the gun drilled holes, allowing ±1.5mm. When processing here, it is necessary to offset the direction of the gun drilled holes to ensure that the pressure-bearing thickness of the cover plate groove is greater than the theoretical required thickness, enhance the compressive strength, and ensure safe use. Embodiment 4:

[0044] Since there are ultra-deep stepped sealing holes with small angles in the substrate of the EMD, the traditional milling machine has insufficient processing stroke and needs to use an extended tool. However, the tool will vibrate during processing due to insufficient rigidity, and the accuracy cannot be guaranteed, making the processing difficult. We then used gun drilling to process its structure to solve the problem of small-angle inclined holes. Gun drilling requires auxiliary tooling to facilitate the guidance of the gun drill bit and determine the processing benchmark. It has a simple structure and is easy to use.

[0045] like Figure 8-10 As shown, Figure 8 This is the overall assembly drawing of the auxiliary tooling. Fig. 9 The upper and lower dies are separated and installed at the positions of the drill collar where the inclined holes need to be processed. The position of the dies is fixed by the limit pins on the drill collar. The upper and lower dies are connected together with cylindrical head hexagon socket screws. Finally, the gun drill straightening sleeve ( Fig.10 ) is installed into the hole of the upper die, and then the inclined hole can be processed.

[0046] Specific processing steps:

[0047] 1. Tire positioning benchmark

[0048] 2. Process the φ11 hole and leave a margin for reaming

[0049] 3. Use the φ11 rough processing hole for positioning and process the φ3.97 hole

[0050] 4. Use φ11 rough processing hole to locate and process the thread bottom hole

[0051] 5. Use φ11 rough-machined hole for positioning and rough-machined φ5.88 hole

[0052] 6. Remove the mold and finely ream φ11

[0053] 7. Use precision-reaming of the φ11 hole positioning sleeve and precision-reaming of the φ5.88 hole.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drilling electrical imaging substrate assembly, characterized in that: The invention comprises a main body (1) of electric imaging while drilling, a sensor hatch (2) is provided in the middle of the main body (1), and relevant sensors in the electric imaging assembly are arranged in the sensor hatch (2), a REIT flow channel converter (3) is inserted at both the front and rear ends of the main body (1), a front body section is installed at the front end of the main body (1), and a rear body section is installed at the rear end of the main body (1).

2. The electro-drilling imaging matrix assembly according to claim 1, characterized in that The front section of the base body comprises an upper transfer drill collar (4), the upper transfer drill collar (4) is arranged on the front side of the main base body (1) of the drilling electrical imaging, the REIT flow channel converter (3) close to the front side is inserted into the upper transfer drill collar (4), an upper small copper ring (5) is arranged between the upper transfer drill collar (4) and the outer wall of the main base body (1) of the drilling electrical imaging, a first wear-resistant sleeve base (6) is installed at the tail end of the upper small copper ring (5), the first wear-resistant sleeve base (6) is arranged on the outer ring surface of the main base body (1) of the drilling electrical imaging, and a plurality of upper guard rings (7) are arranged between the main base body (1) of the drilling electrical imaging and the inner wall of the upper transfer drill collar (4) and close to the front side.

3. The electro-drilling imaging matrix assembly according to claim 1, characterized in that A winding bracket (8) is provided on the outer annular surface of the main substrate (1) of the drilling electrical imaging system and between the sensor hatch (2) and the front section of the substrate. A coil protection cover (9) is provided on the outer side of the winding bracket (8). The coil protection cover (9) is connected to the outer wall of the main substrate (1) of the drilling electrical imaging system.

4. The electro-drilling imaging matrix assembly according to claim 1, characterized in that The rear section of the base body comprises a lower transfer drill collar (10), the lower transfer drill collar (10) is arranged at the rear end of the main base body (1) of the drilling electrical imaging, the REIT flow channel converter (3) close to the rear side is inserted in the lower transfer drill collar (10), a plurality of lower guard rings (11) are arranged between the main base body (1) of the drilling electrical imaging and the inner wall of the lower transfer drill collar (10), a lower copper ring (12) is arranged between the front end of the lower transfer drill collar (10) and the outer wall of the main base body (1) of the drilling electrical imaging, a circuit housing (14) and a second wear-resistant sleeve base (13) are installed in sequence on the front side of the lower copper ring (12), and the circuit housing (14) and the second wear-resistant sleeve base (13) are both sleeved on the outer ring surface of the main base body (1) of the drilling electrical imaging.

5. The electro-drilling imaging matrix assembly according to claim 1, characterized in that A front cover plate (15) is inserted on the outer annular surface of the main drilling electrical imaging substrate (1) and is located between the sensor hatch (2) and the rear section of the substrate.

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