Auxiliary carrying tool for rock debris of horizontal wells
A technology for horizontal wells and cuttings, applied in the field of carrying tools, can solve the problems of cuttings accumulation, returning to the ground, hindering normal drilling, etc., achieving the effect of less wearing parts, simple mechanical structure, and helping rock carrying
Inactive Publication Date: 2015-09-23
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
However, since the borehole in the horizontal well section is almost horizontal, cuttings are deposited on the bottom side of the wellbore, and even a large flow rate of drilling fluid cannot effectively carry the cuttings back to the surface
In some horizontal wells with special wellbore structure design, the hole size in the front section of the horizontal well section is small and the hole size in the back section is large, which makes the cuttings in the back section of the wellbore easier to deposit on the bottom side of the wellbore, resulting in debris accumulation. interfere with normal drilling
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[0011] Such as figure 1 As shown, a horizontal well cuttings assisting tool of the present invention is composed of a housing 1, an upper thrust bearing 2, a rotating cylinder 3, a sliding sleeve 4, a lower thrust bearing 5 and a lower joint 6; its structural characteristics are: the housing The upper part of the body 1 is connected with the upper drill string with threads, and the lower part of the lower joint 6 is connected with the lower drill string with threads; The thrust bearing 5 is installed on the inner circular step at the lower part of the rotating cylinder 3; the rotating cylinder 3, the sliding sleeve 4, the upper thrust bearing 2, and the lower thrust bearing 5 are integrally installed on the casing 1; the lower joint 6 is connected with the casing 1 by screws; The inner circle of the upper end of the rotating cylinder 3 and the contact surface of the housing 1 are sealed with a sealing ring, the inner circle of the lower end of the rotating cylinder 3 and the c...
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Abstract
The invention relates to an auxiliary carrying tool for assisting in carrying rock debris in horizontal well sections in the petroleum and natural gas industry. By the aid of the auxiliary carrying tool, problems of deposition of rock debris in existing horizontal well sections and low rock carrying efficiency of well drilling liquid can be solved. The technical scheme includes that the upper portion of a shell is connected with upper drilling strings in a threaded manner, and the lower portion of a lower connector is connected with lower drilling strings in a threaded manner; a slide bushing is mounted in an inner cavity of a rotary barrel, an upper thrust bearing is mounted on a step of an inner circle of the upper portion of the rotary barrel, and a lower thrust bearing is mounted on a step of an inner circle of the lower portion of the rotary barrel; the rotary barrel, the slide bushing, the upper thrust bearing and the lower thrust bearing are integrally mounted on the shell; the lower connector is connected with the shell in a threaded manner. The auxiliary carrying tool has the advantages that the auxiliary carrying tool is simple in mechanical structure, has few vulnerable parts and can be driven by well drilling liquid in annular spaces, accordingly, extra power can be omitted, the rock carrying capacity of the well drilling liquid in the horizontal well sections can be effectively improved, and the well drilling efficiency can be improved.
Description
technical field [0001] The invention relates to a carrying tool used in the oil and gas industry to help drilling fluid carry cuttings in a horizontal well section. Background technique [0002] In the oil and gas industry, horizontal wells are widely used in reservoirs with thin and ultra-thin layers, low and ultra-low permeability, edge and bottom water, requiring optimized pressure control and improved sweep efficiency, and multiple groups of natural fractures. The main advantages of horizontal wells are that they can increase well productivity, reduce economic risks in heterogeneous formations, and reduce unit technology costs. However, since the wellbore in the horizontal well section is almost horizontal, cuttings are deposited on the bottom side of the wellbore, and even a large flow rate of drilling fluid cannot effectively carry the cuttings back to the surface. In some horizontal wells with special wellbore structure design, the hole size in the front section of t...
Claims
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Inventor 张梁梁政赵勇叶哲伟张澜梁平唐秋霞何虹钢
Owner SOUTHWEST PETROLEUM UNIV