CN-121976748-A - Construction process for directional drilling crossing of inclined shaft

Abstract

The invention relates to a construction process for directional drilling and traversing of an inclined shaft, and belongs to the technical field of horizontal directional drilling construction. The method comprises the steps of preparing construction before drilling, drilling a guide hole by a directional drilling machine along a designed drilling track crossing curve, pumping drilling fluid mixed by water and sodium dodecyl benzene sulfonate in the drilling process, alternately constructing reaming and hole cleaning processes after the guide hole drilling process is finished, pumping the drilling fluid mixed by water and sodium dodecyl benzene sulfonate in the reaming and hole cleaning processes, and performing pipeline sectional installation connection pipes according to a hole track formed by the designed drilling track crossing curve. The method aims to solve two construction problems of the directional drilling crossing construction precision of the inclined shaft and the bentonite slurry treatment, realize the aims of accurately controlling the deviation of a soil outlet point and treating the slurry without carrying out the process, greatly improve the construction efficiency and reduce the construction cost.

Inventors

• YIN HANG
• HU FANGLIANG
• ZHANG LIANG
• WANG HAITAO
• YIN JIANFENG
• HAN FENG
• HUO YAN
• HUO GANG
• CHAI YI
• MA CHUANDONG
• CUI YAN
• YIN SHASHA
• XU BIN
• GUO CHONG
• LIU FANJING

Assignees

• 辽河石油勘探局有限公司
• 中国石油天然气集团有限公司

Dates

Publication Date

20260505

Application Date

20241031

Claims (10)

1. 1. A directional drilling and crossing construction process for inclined wells is characterized in that, S1, preparing construction before drilling; s2, drilling a guide hole by the directional drilling machine along a designed drilling track crossing curve, and pumping drilling fluid mixed by water and sodium dodecyl benzene sulfonate in the drilling process; S3, performing alternate construction of reaming and hole cleaning procedures after the pilot hole drilling procedure is completed, and pumping drilling fluid mixed by water and sodium dodecyl benzene sulfonate in the reaming and hole cleaning procedures; s4, pipeline sectional installation connection pipes are carried out according to hole tracks formed by designing through the drilling track curves.
2. 2. A deviated well directional drilling traversing construction process as claimed in claim 1, wherein pre-drilling construction preparation comprises survey setting-out, site placement, rig floor fabrication, and rig installation commissioning.
3. 3. The construction process for directional drilling and traversing of inclined shafts according to claim 2, wherein the measuring paying-off is implemented by firstly establishing a plane control network and an elevation control network, and then measuring paying-off by using measuring instruments according to a line plan view, a section view, a control pile, a traversing pile and a leveling pile.
4. 4. The construction process for directional drilling and traversing of the inclined shaft according to claim 3, wherein the measurement of the paying-off content comprises retesting the traversing length according to traversing piles, control piles and leveling piles, paying out a drilling machine axis according to the control piles and the traversing piles, setting a compacting pile on the traversing axis, paying out boundary lines of a pipeline construction operation belt and a drilling machine construction operation belt according to a site floor plan, and measuring and determining positions of traversing soil points and soil entering points after a construction site is leveled, wherein the allowable deviation of elevation of the soil exiting points and the soil entering points is within +/-50 mm, and the allowable deviation of the plane positions of the soil exiting points and the soil entering points is within +/-50 mm.
5. 5. The construction process for directional drilling and traversing of the inclined shaft according to claim 2, wherein the site arrangement is characterized in that a surface soil stacking area, an original soil stacking area, a drainage canal, a control room, a power supply area, a drill rod placing area, a drilling machine placing area, accessories and a drill bit placing area are arranged in the site area, a rectangular working pit with the same traversing design angle is required to be excavated at the site slope top, the directional drilling machine and the central line of the working pit are on the same straight line, then installation and debugging of the drilling machine are carried out according to the topography and the designed drilling angle, the central line of the drill rod and the traversing axis of the inclined shaft are ensured to be concentric, the entering angle is ensured, an operating pit is required to be excavated at the earth outlet point, and the directional drilling and traversing earth outlet end is positioned in the operating pit.
6. 6. The construction process for directional drilling and traversing of inclined shafts according to claim 2, wherein the drilling platform is specifically manufactured by adopting a filling and tamping mode to manufacture a drilling machine positioning platform conforming to a drilling angle, the whole drilling positioning platform is trapezoid, the top of the drilling machine positioning platform adopts a slope design, and the slope angle is not higher than 5 °.
7. 7. The construction process for directional drilling and traversing of an inclined shaft according to claim 1, wherein the directional drilling machine carries out guiding hole drilling along a designed traversing drilling track curve, specifically, geological data is carefully analyzed before drilling is carried out, a steering scheme is determined, a gyroscope guiding system is adopted for steering equipment, the directional drilling line is curved according to the entering angle of a traversing section of the directional drilling machine, steering data are collected at least once from a soil entering point along the curve to a soil discharging point during drilling, deviation between an actual curve of a guiding hole and the designed traversing curve is not more than 1% in time according to the collected steering data, lateral deviation of the soil discharging point of the guiding hole is within +/-3 m, allowable deviation of elevation is within-2 m to +1m, and longitudinal deviation is within-3 m to +9m.
8. 8. The directional drilling and traversing construction process for inclined shafts according to claim 1, wherein the reaming and hole cleaning procedure is performed in a hierarchical manner and a plurality of reaming steps are adopted, and hole cleaning operation is performed after each level of reaming.
9. 9. The directional drilling and traversing construction process for inclined shafts according to claim 1, wherein the weight ratio of water in the drilling fluid to sodium dodecyl benzene sulfonate is 3000:1.
10. 10. The directional drilling and traversing construction process for inclined shafts according to claim 1, wherein pipeline sectional installation connection pipes, particularly adjacent steel pipes, are welded end to end according to a hole track formed by designing a traversing drilling track curve, and are placed along a guide Kong Diao by means of a hoisting device sectional chute.

Description

Construction process for directional drilling crossing of inclined shaft Technical Field The invention relates to a construction process for directional drilling and traversing of an inclined shaft, and belongs to the technical field of horizontal directional drilling construction. Background The common methods in the drilling industry include reverse drilling, which is a drilling method that drills a drill bit back from a wellhead, and directional drilling, which is a method that firstly drills a small-diameter borehole in the wellhead, then drills a target horizon from the borehole back by means of a drilling machine, a drill bit, and the like, and then performs logging, drilling wall, and the like. The directional drilling is a drilling mode for directionally drilling a drill bit into a specific underground position, and the directional drilling adopts an exploration technology and a drilling tool to control the drill bit to be in a certain direction and angle so as to accurately drill into a target horizon. Directional drilling and reaming is a technique for performing trenchless subterranean projects by rotating and propelling a drill bit. The directional drilling and reaming device is mainly applied to the fields of constructional engineering, bridge tunnels, underground pipelines, geological exploration and the like. In the prior art, china patent application number 202311308168.4 discloses a secondary well formation construction method based on a well reversing drilling process, wherein a directional drilling machine is adopted to drill a directional drilling bit, after the directional drilling construction is completed, the directional drilling rod and the directional drilling machine are withdrawn, deviation of the directional drilling bit is measured, a reverse well drilling machine is installed, a small reverse well drilling rod and a reaming bit are connected, secondary hole brushing is carried out on the reaming bit along the directional drilling to form a pilot hole, then the reaming bit is replaced by the small reverse well drilling bit, the small reverse well drilling rod is withdrawn to drive the small reverse well drilling bit to excavate along the pilot hole direction to form a pilot well, the small reverse well drilling rod and the small reverse well drilling bit are withdrawn, the large reverse well drilling bit is horizontally connected in a top-down mode in the pilot well in the vertical/inclined well design direction, and then the reverse well drilling machine is driven to lift the drilling bit to excavate along the pilot well direction. And the second expansion digging technology is carried out on the basis of digging out the guide well by the first time of the well reversing drilling machine, so that the influence of directional drilling deflection on well formation is effectively eliminated. Because the inclined shaft passes through the deflecting section only, the deviation of the soil outlet point of the once directional passing through guide hole drilling process is large, the subsequent hole repairing difficulty is large, the unadjustable deflection of the whole pipeline is caused, the construction difficulty with the connecting head of the main pipeline is increased, the construction time is increased, and the construction cost is increased. For the horizontal directional drilling crossing construction of the large-angle inclined shaft, the bentonite configuration slurry is adopted as the whole process of drilling fluid penetration guiding, reaming and hole cleaning. During construction of the bentonite slurry, each single inclined shaft directional drilling crossing project at least needs to excavate one slurry storage pit and one slurry diversion pit, so that the area of a working field is increased. The slurry prepared by the bentonite needed by directional drilling of the inclined shaft contains chemical agents such as caustic soda, polyaluminium chloride, polyacrylamide and the like, and is easily subjected to the influence of scouring force and gravity, so that the phenomena of running and overflowing and penetrating into surrounding soil layers are extremely easy to occur, and the ecological environment is influenced to a certain extent. In the construction process, the slurry transport link and the waste slurry treatment after the construction are finished, and longer time and larger cost are also required. Disclosure of Invention The invention provides a high-precision bentonite-free slurry directional drilling construction process suitable for large-angle inclined shaft crossing, which aims to solve two construction problems of inclined shaft directional drilling crossing construction precision and bentonite slurry treatment, realize the aims of accurately controlling the deviation of a soil outlet point, avoiding the need of transporting and treating slurry, greatly improve the construction efficiency and reduce the construction cost. In order to achieve the above