Performance test of the hottest xc82 hydraulic rot

Performance test of XC-82 hydraulic rotary percussion drill and supporting bit

in order to meet the needs of deep well drilling in hard formation in Daqing Oilfield, the drilling Research Institute of Daqing Petroleum Administration has carried out the development of hydraulic rotary percussion drill and supporting bit. In September, 1998, the main technical performance of the XC-82 hydraulic rotary percussion drill and its supporting bit simulation prototype was tested, and satisfactory results were achieved. Structure and working principle XC-82 hydraulic rotary percussion drill and supporting bit (Figure 1) are mainly composed of water hammer valve, support seat, percussion hammer, throttle valve, anvil shaft, barrel and bit. This drilling tool can convert the drilling fluid energy into the high-frequency mechanical impact energy of the bit, and skillfully solve the contradiction between several factors affecting the drilling speed (specific load, loading speed, action time) and the existing drilling conditions (there is almost no distinction between domestic and imported drilling equipment, drilling tools, and drilling Technology), so as to achieve high-efficiency volume rock breaking. When the drilling fluid flows through the hydraulic rotary percussion drill and the throttle valve of the supporting bit, the working pressure difference is established at the upper and lower ends of the water hammer valve and the percussion hammer. The water hammer valve and the hammer rise successively under the action of the working differential pressure. When the hammer goes up to contact the water hammer valve core at the top dead center, the lifting force of the hammer is cut off. At the same time, the drilling fluid channel is suddenly closed, and the drilling fluid speed suddenly drops to zero, which then causes the action of inertia head and suddenly increases the pressure, that is, water hammer pressure. Under the action of water hammer pressure, the water hammer valve core and the hammer quickly descend together. When the water hammer valve core descends a certain stroke, it is limited by the support and separated from the hammer. The hammer continues to move downward due to inertia until it impacts the anvil shaft to realize the impact on the rock. At the same time, the circulation of drilling fluid has resumed, and the water hammer valve core and hammer rise successively under the action of working pressure difference. Fig. 1 structural diagram of XC-82 hydraulic rotary percussion drill and supporting bit

1 - water hammer valve seat; 2 - cylinder; 3 - water hammer valve core; 4 - support seat

5 - impact hammer; 6 - anvil shaft; 7 - drill bit; 8 - throttle nozzle; 9 - main technical parameters and technical features of dynamic seals 1 Main technical parameters nominal size: φ 82mm;

total length: 1670mm

maximum outer diameter: 108mm

minimum inner diameter: 25mm

effective length: 1620mm

maximum working torque: 7.75kn m。 2. Technical characteristics at present, due to the characteristics of overcoming hard formations, rotary percussive drilling tools and processes have been extended from the Department of Geology and mineral resources to the Department of petroleum. With the gradual increase of oil field exploration and development, the gradual improvement of people's understanding level, and the rapid development of material science, they will be widely used in oil fields. Due to the differences between oil drilling and drilling in geological and mineral departments, rotary impact drilling tools and processes that meet the quality needs of customers in time also have the following problems: ① high temperature in deep wells of oil wells, strict requirements for sealing materials, slightly better static sealing, and short service life of high-frequency and high-speed dynamic sealing are common problems; ② There are many parts in the tool, which not only affects the accuracy, but also reduces the reliability; ③ Rotary percussion drilling tools are usually equipped with cone bits. It is common for cone bits to fall off during conventional drilling, and rotary percussion drilling will increase the occurrence of these accidents; ④ The circulating medium used in oil drilling is liquid rather than gas, resulting in low rock breaking energy of rotary percussion drilling tools used in oil drilling [1 ~ 3]. The design of XC-82 hydraulic rotary percussion drill and its supporting bit strives to solve or alleviate the above problems. It has the following characteristics:

(1) the dynamic seal design meets the requirements of high temperature resistance, high speed resistance, high frequency resistance and low friction resistance, which can improve the service life

(2) the whole set of tools (including drill bit) is only composed of eight parts, which improves the accuracy and reliability

(3) the bit equipped with rotary percussion drill is a new type of rotary percussion bit, which is different from cone bit and PDC bit. It has high impact resistance and wear resistance, and can greatly reduce the occurrence of fish falling accidents

(4) due to the good heat treatment of all mating surfaces in the tool, it can ensure high-precision matching, greatly reduce the friction loss of liquid phase and solid phase, and thus improve the impact energy of rock breaking by the hammer. For example, under the condition of 100 ~ 350l/min flow of the main pump, the impact energy is 11.5 ~ 132j. Compared with the same type of rotary percussion drill at home and abroad, its impact energy is larger and its performance is excellent, which is close to the working parameters of ordinary pneumatic DTH hammer of the same specification at home and abroad. Impact force test 1 Test system and principle hydraulic rotary percussion drilling tool test system is shown in Figure 2. The impact force and impact frequency of drilling tools were introduced to wangshiwei's team, which were mainly measured by blr-1/10t tension pressure sensor and GF-1 amplifier. The blr-1/10t tension pressure sensor is connected between the hydraulic rotary percussion drill to be tested and the rotary percussion bit through the conversion joint. The fixation, power source and circulating medium of the hydraulic rotary percussion drill are provided by the wt-50 geophysical exploration vehicle mounted drill. During the test, the pump pressure data is provided by the pressure gauge on the drilling pump of the on-board drilling rig; The displacement data is provided by the on-board flowmeter; The time data is provided by the stopwatch. Place (or drill) a 1m piece under the impact drill bit × 1m × 0.5m granite. The test principle is: when the hammer reciprocates, its impact force acts on the blr-1/10t tension pressure sensor and is transmitted to the GF-1 amplifier. The impact force and frequency are measured by the impact signal monitoring system, which mainly includes high-speed data acquisition card, microcomputer, processing software system and printer. Figure 2 Schematic diagram of performance test system

1 - pump; 2 - circulating joint 2; 3 - flowmeter (vehicle); 4 - circulating joint 1; 5 - water hose; 6 - the international organization for Standardization (ISO) of power head constantly formulates and publishes international standards for biomedical materials and products; 7 - short drill pipe; 8 - rotary punching drilling tool body; 9 - rotary punching drill spindle; 10 - drill string adapter 1; 11 - tester; 12 - drill string adapter 2; 13 - rotary punching bit 2 Test plan and procedure