3.375-inch rotary steering tool

Abstract

The utility model relates to a 3.375-inch rotary guide tool which is mainly composed of a measurement control circuit, an upper driving shaft, a gamma measurement unit, a hydraulic unit, a rotary seal, a guide body, a pushing unit, a bearing and a lower driving shaft, the measurement control circuit is installed in the center of a drill collar, the gamma measurement unit and the hydraulic unit are installed on the upper driving shaft, and the rotary seal is installed on the lower driving shaft. The hydraulic cylinder is connected with the pushing unit through a rotary seal and a hydraulic pipeline, the pushing unit is fixed through the guide body, and the pushing unit is pushed out through the first hydraulic cylinder and the second hydraulic cylinder. Under the control of the measurement control circuit, the hydraulic unit provides required pressure and sends the pressure to the pushing arms through the rotary seal, the three pushing arms of the double hydraulic cylinders form vector resultant force under different pressures, a drilling tool is pushed to drill in the set direction, guiding is achieved, then the drilling track is controlled, and the near-bit orientation gamma detection unit is placed on the small-size rotary guider. And accurate geosteering can be realized closer to a drill bit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of petroleum and exploration technology, in particular to a 3.375 inch rotary steerable downhole tool, which is applied to the field of slim hole lateral drilling and used for drilling with a workover rig or coiled tubing drilling. BACKGROUND

[0002] Currently, drilling requires multiple wells and cost reduction, and slim hole and lateral drilling of old wells with a workover rig, which has a short cycle, and there is no small size rotary steerable tool in China. The rotary steerable tool can drill further than the screw in coiled tubing drilling. In this background, the 3.375 inch rotary steerable tool is designed to fill the gap of this product and meet the demand for small hole lateral drilling with a workover rig or coiled tubing drilling. SUMMARY

[0003] The purpose of the present application is to provide a 3.375 inch rotary steerable tool, which can be connected to coiled tubing or small size drill pipe. The rotary steerable technology is used for small size drilling, which requires the rotary steerable tool to be small. The 3.375 inch rotary steerable tool adopts a segmented design combined with high strength materials, which can meet the strength requirements and reduce the cost of mechanical parts.

[0004] Specific technical solutions:

[0005] The 3.375 inch rotary steerable tool mainly comprises a measurement control circuit, an upper drive shaft, a gamma measurement unit, a hydraulic unit, a rotary seal, a guide body, a push unit, a bearing and a lower drive shaft, wherein the measurement control circuit is installed in the center of the drill collar, the gamma measurement unit and the hydraulic unit are installed on the upper drive shaft, and the push unit is connected by the rotary seal and the hydraulic pipeline, the push unit is fixed by the guide body, and the push unit is pushed out by the hydraulic cylinder one and the hydraulic cylinder two.

[0006] The measurement control circuit mainly comprises a system control part, an attitude measurement part and a hydraulic control part, and the measurement control circuit is arranged on the circuit skeleton of the drill collar, the system control part, the attitude measurement part and the hydraulic control part are fixed on the circuit skeleton by fixing screws, and the parts are connected by electronic connectors one, two, three and four.

[0007] The gamma measurement unit mainly comprises a signal processing circuit and a gamma detector, and the signal processing circuit and the gamma detector are arranged in the circuit cabin of the upper drive shaft, and are connected by wires and an electronic connector five.

[0008] The hydraulic unit is mainly composed of a motor, a micro pump, a safety valve, a throttle valve and an oil bag, the motor and the micro pump are fixed by mechanical screws, and the micro pump, the safety valve and the throttle valve are connected through hydraulic pipelines.

[0009] The pushing unit is mainly composed of pushing arms one, two and three, hydraulic cylinders one and two, the pushing arms one, two and three are installed on the guide body through screws, the hydraulic cylinders one and two are arranged below the pushing arms one, two and three and directly contact with the pushing arms, and the hydraulic cylinders one and two directly push out the pushing arms one, two and three to support the well wall.

[0010] The measurement control circuit collects the tool face angle of the pushing arm in the pushing arm unit under the control of a trigger signal, the tool face angle information is analyzed and controlled by the measurement control circuit, control instructions are sent to the hydraulic control part, the hydraulic control part drives the hydraulic unit, controls the rotating speed of the direct current motor, and then drives the micro pump to hit the hydraulic oil in the oil bag of the hydraulic unit to the pushing arm unit through the hydraulic pipeline and the rotary sealing part, the pushing arms one, two and three support the well arm under the oil pressure of the hydraulic cylinders one and two, the support forces of the pushing arms one, two and three to the well wall are different, a resultant force is formed, and the control instrument drills in the required direction.

[0011] The working principle of the hydraulic unit is as follows: the hydraulic oil is stored in the oil bag, the direct current motor rotates to drive the pump to rotate, the hydraulic oil is pumped into the pipeline, and the hydraulic cylinders one and two are pushed out through the rotary sealing, the pressure sensor measures the pressure in the hydraulic cylinders one and two and transmits the pressure to the measurement control circuit, when the pressure reaches the limit value, the safety valve is opened to release the pressure, so as to prevent the pressure from exceeding the limit and damaging the hydraulic unit, and the throttle valve is a normally open valve, the hydraulic oil returns to the oil bag through the throttle valve and the hydraulic pipeline.

[0012] The advantages of the present application are as follows:

[0013] 1. The design combining the segmented type and the high-strength material meets the requirements of the small-size rotary steering tool, the rotating shaft is short and has high strength;

[0014] 2. The small-size rotary steering tool body realizes hydraulic pushing while rotating at a high speed with the drill bit;

[0015] 3. The small-size double-hydraulic-cylinder hydraulic pushing unit with large pushing force is designed, the pushing force is large, and the build-up rate is high;

[0016] 4. The short shaft design is convenient for maintenance and replacement of worn parts, and reduces the cost;

[0017] 5. The small-size rotary steering tool is provided with a near-bit azimuth gamma detection unit, which is closer to the drill bit and can accurately guide the geology;

[0018] 6. The built-in circuit design enables small size tool, while the overall circuit works stably and reliably;

[0019] 7. The integrated rotary steering circuit software enables to be put into small size rotary steering tool. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The schematic diagram of the 3.375 inch rotary steering tool measurement control circuit of the present application;

[0021] Figure 2 The schematic diagram of the 3.375 inch rotary steering tool profile of the present application;

[0022] Figure 3 The schematic diagram of the 3.375 inch rotary steering tool appearance of the present application;

[0023] Figure 4 The schematic diagram of the 3.375 inch gamma measurement unit of the present application Figure 1 ;

[0024] Figure 5 The schematic diagram of the 3.375 inch gamma measurement unit of the present application Figure 2 ;

[0025] Figure 6 The schematic diagram of the 3.375 inch hydraulic unit of the present application;

[0026] Figure 7 The schematic diagram of the 3.375 inch push unit of the present application;

[0027] Figure 8 The schematic diagram of the 3.375 inch double hydraulic cylinder of the present application. DETAILED DESCRIPTION

[0028] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The 3.375 inch rotary steering tool is mainly composed of a measurement control circuit 1, an upper drive shaft 2, a gamma measurement unit 3, a hydraulic unit 4, a rotary seal 5, a guide body 6, a push unit 7, a bearing 8, and a lower drive shaft 9. The measurement control circuit 1 is installed at the center of the drill collar 10, the gamma measurement unit 3 and the hydraulic unit 4 are installed on the upper drive shaft 2, and are connected with the push unit 7 through the rotary seal 5 and the hydraulic pipeline. The push unit 7 is fixed by the guide body 6, and is pushed out by the double hydraulic cylinders of the hydraulic cylinder one 74 and the hydraulic cylinder two 75.

[0029] The measurement control circuit 1 mainly comprises a system control part 11, a posture measurement part 12 and a hydraulic control part 13, and is arranged on a circuit framework 14 of the drill collar 10. The system control part 11, the posture measurement part 12 and the hydraulic control part 13 are fixed on the circuit framework 14 by fixing screws 19, and are connected by electronic connectors 15, 16, 17 and 18.

[0030] The gamma measurement unit 3 mainly comprises a signal processing circuit 31 and a gamma detector 32, and is arranged in a circuit cabin 33 of the upper drive shaft 2. The signal processing circuit 31 and the gamma detector 32 are connected by a wire 34 and an electronic connector 35.

[0031] The hydraulic unit 4 mainly comprises a motor 41, a micro pump 42, a safety valve 43, a throttle valve 44 and an oil bag 45. The motor 41 and the micro pump 42 are fixed by a mechanical screw 46. The micro pump 42, the safety valve 43 and the throttle valve 44 are connected by a hydraulic pipeline 47.

[0032] The push unit 7 mainly comprises push arms 71, 72 and 73, hydraulic cylinders 74 and 75. The push unit 7 is installed on the guide body 6 by screws 76. The hydraulic cylinders 74 and 75 are arranged below the push arms 71, 72 and 73 to directly contact them. The hydraulic cylinders 74 and 75 directly push out the push arms 71, 72 and 73 to support the well wall.

[0033] The measurement control circuit 1 collects the tool face angle of the push arms in the push arm unit 7 under the control of a trigger signal. After analysis and control of the measurement control circuit 1, control instructions are sent to the hydraulic control part 13. The hydraulic control part 13 drives the hydraulic unit 4 to control the rotating speed of the motor 41, and then drives the micro pump 42 to hit the hydraulic oil in the oil bag 45 of the hydraulic unit 4 to the push arm unit 7 through the hydraulic pipeline 47 and the rotary seal 5. The push arms 71, 72 and 73 support the well arm under the oil pressure of the hydraulic cylinders 74 and 75. The support forces of the push arms 71, 72 and 73 on the well wall are different, forming a resultant force, so that the control instrument drills in the required direction.

[0034] The working principle of the hydraulic unit 4 is that hydraulic oil is stored in the oil bag 45, the direct current motor 41 rotates to drive the pump 42 to rotate, the hydraulic oil is pumped into the pipeline, passes through the rotary seal 5 to the push unit 7 to push the hydraulic cylinder one 74 and the hydraulic cylinder two 75, the pressure sensor measures the pressure in the hydraulic cylinder one 74 and the hydraulic cylinder two 75 and transmits to the measurement control circuit 1, when the pressure reaches the limit value, the safety valve 43 is opened to release pressure, preventing the pressure from exceeding the limit and damaging the hydraulic unit 4, the throttle valve 44 is a normally open valve, the hydraulic oil returns to the oil bag 45 through the throttle valve 44 and the hydraulic pipeline 47.

[0035] The above merely describes the preferred embodiment of the present application, and the protection scope of the present application is not limited thereto. Any equivalent transformation based on the technical scheme of the present application belongs to the protection scope of the present application.

Claims

1. A 3.375 inch rotary steerable tool characterized by: Mainly by measurement control circuit (1), the upper drive shaft (2), gamma measurement unit (3), hydraulic unit (4), rotary seal (5), guide body (6), push unit (7), bearing (8), lower drive shaft (9) is composed, wherein, measurement control circuit (1) is installed in the center of the drill collar (10), gamma measurement unit (3) and hydraulic unit (4) are installed on the upper drive shaft (2), connected with push unit (7) through rotary seal (5) and hydraulic pipeline, push unit (7) is fixed by guide body (6), push unit (7) is pushed out by hydraulic cylinder one (74) and hydraulic cylinder two (75) double hydraulic cylinder.

2. The 3.375 inch rotary steerable tool of claim 1, wherein, The measurement control circuit (1) mainly includes system control part (11), attitude measurement part (12), hydraulic control part (13), and the measurement control circuit is arranged on the circuit skeleton (14) located in the drill collar (10). The system control part (11), the attitude measurement part (12) and the hydraulic control part (13) are fixed on the circuit skeleton (14) by fixing screws (19), and are connected by electronic connectors (15), (16), (17) and (18).

3. The 3.375 inch rotary steerable tool of claim 1, wherein, The gamma measurement unit (3) mainly includes signal processing circuit (31) and gamma detector (32), and the signal processing circuit (31) and the gamma detector (32) are arranged in the circuit cabin (33) located in the upper drive shaft (2). The signal processing circuit (31) and the gamma detector (32) are connected by wires (34) and electronic connector five (35).

4. The 3.375 inch rotary steerable tool of claim 1, wherein, The hydraulic unit (4) is mainly composed of motor (41), micro pump (42), safety valve (43), throttle valve (44) and oil bag (45). The motor (41) and the micro pump (42) are fixed by mechanical screws (46), and the micro pump (42), the safety valve (43) and the throttle valve (44) are connected by hydraulic pipelines (47).

5. The 3.375 inch rotary steerable tool of claim 1, wherein, The push unit (7) is mainly composed of push arm one (71), push arm two (72), push arm three (73), hydraulic cylinder one (74) and hydraulic cylinder two (75). The push unit (7) is installed on the guide body (6) by screws (76), and the hydraulic cylinder one (74) and the hydraulic cylinder two (75) are arranged below the push arm one (71), the push arm two (72) and the push arm three (73) to directly contact. The hydraulic cylinder one (74) and the hydraulic cylinder two (75) are directly pushed out to support the well wall.

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