While-drilling power reamer for petroleum and natural gas drilling
An oil and gas, power-while-drilling technology, applied in drilling equipment, drill bits, earth-moving drilling, etc., can solve the problems of easy loosening of the blade and irregular wall expansion of the wellbore, and achieve the effect of avoiding loosening and good wall expansion.
Active Publication Date: 2022-02-18
SINOPEC SOUTHWEST OIL & GAS
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Problems solved by technology
[0006] Aiming at the deficiencies existing in the prior art, the present invention proposes a power reamer while drilling for oil and gas drilling to solve the problem that the blade of the existing reamer is prone to loosening when the blade of the reamer expands the wall of the wellbore. The problem of irregular expansion of the wellbore wall
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Embodiment 3
[0047] On the basis of the above Embodiment 1 and Embodiment 2, in this embodiment, please refer to Figure 4 and Figure 5 , also includes an elongation assembly 7, and the elongation assembly 7 includes an auxiliary knife 71, a slide plate 72 and a pull cord 73. The wall expanding knife 31 is provided with a sliding cavity, the sliding cavity is provided with an axially connected mounting hole of the cutter head of the wall expanding knife 31, the sliding cavity is provided with a pressurized passage communicated with the step groove, and the auxiliary knife 71 is slidably inserted in the In the installation hole, the sliding plate 72 is sealed and slidably installed in the sliding chamber, the push plate and the auxiliary knife 71 are fixedly connected by welding, the push plate can push the auxiliary knife 71 to extend out of the installation hole, and one end of the stay rope 73 is connected to the support plate 4. At the bottom end, the other end of the stay rope 73 pas...
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The invention relates to the technical field of well drilling devices and particularly relates to a while-drilling power reamer for oil and gas well drilling. The reamer comprises an outer shell, a transmission shaft, a wall expanding assembly, a supporting plate and a reset assembly, wherein the transmission shaft is sleeved with the outer shell in a sliding mode; an annular groove is formed in an inner wall of the outer shell, a wall expanding hole communicated with the outside is formed in the groove bottom of the annular groove, and a step groove is formed in the wall expanding hole; the wall expanding assembly comprises a wall expanding cutter and a first spring, the wall expanding cutter is inserted into the wall expanding hole in a sliding mode, an end, facing the transmission shaft, of the wall expanding cutter is an inclined end, the first spring is installed in the step groove, a supporting plate is installed in the annular groove, and an installation end of the supporting plate is connected with the transmission shaft; the transmission shaft is sleeved with the reset assembly, and the reset assembly is located at a top end of the supporting plate. The invention aims to solve a problem that when a blade of an existing reamer is used for expanding the wall of a borehole, the blade is easy to loosen, so the expanded wall of the borehole is irregular.
Description
technical field [0001] The invention relates to the technical field of drilling devices, in particular to a drilling-while-drilling power reamer for oil and gas drilling. Background technique [0002] The eye reamer is also called the expander reaming drill bit. It is a tool used for reaming while drilling oil wells. When the lower bit drills, the upper reamer simultaneously reams and trims the borehole wall. [0003] In the process of oil and gas development and drilling, the depth of drilling is gradually deepened, and drilling is faced with more and more complex well structures and stratum structures, and the problems encountered are becoming more and more complicated. Due to the instability of the wellbore wall and the compression of the formation, the diameter of the wellbore is often reduced, which makes it difficult to continue the drilling process and the horizontal wellbore shrinks. [0004] At present, a downhole reamer while drilling disclosed in Chinese Public...
Claims
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IPC IPC(8): E21B7/28E21B10/32
CPCE21B7/28E21B10/322Y02P70/10
Inventor 王希勇欧彪吴建忠何龙曹波胡大梁
Owner SINOPEC SOUTHWEST OIL & GAS