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CN-122014198-A - Radial horizontal well yield and injection increasing system and method based on abrasive jet flow

CN122014198ACN 122014198 ACN122014198 ACN 122014198ACN-122014198-A

Abstract

The invention belongs to the field of oil and gas field development, and relates to a radial horizontal well yield and injection increasing system and method based on abrasive jet flow. The system comprises a forging milling reaming unit and a radial drilling unit, wherein the forging milling reaming unit comprises a rotary faucet and a forging milling reaming tool string, the radial drilling unit comprises a radial drilling tool string, the forging milling reaming tool string is used for carrying out hydraulic forging milling and reaming treatment on a casing section and a reservoir in a near-wellbore zone to form a reservoir cavity, and the radial drilling tool string is used for carrying out radial horizontal drilling in the reservoir. The method comprises the steps of carrying out erosion and crushing on a sleeve, a well cementation cement ring and a reservoir through abrasive jet flow, integrating sleeve forging and milling and reservoir reaming procedures into one-pass tubular column operation, then conveying the abrasive jet flow through a continuous oil pipe, and carrying out radial horizontal rock breaking and drilling on the reservoir to form multi-layer and multi-azimuth radial horizontal holes.

Inventors

  • LI LUOPENG
  • ZHOU WEIDONG

Assignees

  • 中国石油大学(华东)

Dates

Publication Date
20260512
Application Date
20260414

Claims (9)

  1. 1. The radial horizontal well yield and injection increasing system based on abrasive jet flow is characterized by comprising a forging milling reaming unit and a radial drilling unit; The forging milling reaming unit comprises a rotary faucet (7) and a forging milling reaming tool string (2) connected with the rotary faucet (7); The radial drilling unit comprises a coiling machine (18), and a coiled tubing (17) of the coiling machine (18) is communicated with a radial drilling tool string (19); The radial drilling tool string (19) comprises a radial drilling oil pipe (19-5), a reversible anchor (19-4) is sleeved outside the radial drilling oil pipe (19-5), a cavity is formed in the radial drilling oil pipe (19-5), a metal drilling pipe (19-3) is arranged in the cavity, the lower end of the metal drilling pipe (19-3) is connected with a drill bit (19-2), the upper end of the metal drilling pipe is connected with a coiled tubing (17), and the lower end of the radial drilling oil pipe (19-5) is connected with a downhole steering gear (19-1); The downhole steering device (19-1) comprises a shell (19-1-1) connected with a radial drilling oil pipe (19-5), an annulus is formed between the upper part of the shell (19-1-1) and a metal drill pipe (19-3), through holes (19-1-14) penetrating through two sides of the shell are formed in the middle part of the shell, a guide shoe (19-1-9) connected with the shell (19-1-1) is arranged at the lower part of the shell, a piston (19-1-2) connected with the shell (19-1) in a sealing mode is arranged in the annulus, a spring (19-1-3) is sleeved outside the piston (19-1-2), a cavity through which the metal drill pipe (19-3) and the drill bit (19-2) pass is formed in the piston (19-1-2), a steering short-period group is arranged in the through holes (19-1-14), and the bottom end of the piston (19-1-2) is connected with the steering short-period group.
  2. 2. The abrasive jet based radial horizontal well stimulation system of claim 1, wherein the forging milling reamer tool string (2) comprises a drill pipe (2-1) and a forging milling reamer (2-2) connected to a lower end thereof.
  3. 3. The abrasive jet-based radial horizontal well stimulation and injection enhancement system according to claim 2, wherein the forging and milling reamer (2-2) comprises a forging and milling reamer body (2-2-1), a cavity communicated with a drill rod (2-1) is arranged in the forging and milling reamer body (2-2-1), a hard alloy protective sleeve (2-2-2) is arranged on the outer circle and provided with a forging and milling reamer nozzle (2-2-3) communicated with the cavity, the forging and milling reamer nozzle (2-2-3) is connected with the forging and milling reamer body (2-2-1) through a nozzle sleeve (2-2-4), and the forging and milling reamer nozzle (2-2-3) comprises a nozzle inner runner (2-2-3-1) and an oblong nozzle outlet (2-2-3-2).
  4. 4. The abrasive jet-based radial horizontal well stimulation and injection enhancement system according to claim 1, wherein the steering sub-groups comprise five steering sub-groups, the bottom end of the piston (19-1-2) is rigidly connected with the upper end of a first steering sub-group (19-1-4) of the steering sub-groups, the middle adjacent steering sub-groups are hinged through a follow-up hinge (19-1-12), the fourth steering sub-group and the fifth steering sub-group are hinged through a fixed hinge (19-1-11), the fixed hinge (19-1-11) is hinged with the shell (19-1-1), an included angle is arranged between the adjacent steering sub-groups, the side edges of the steering sub-groups can be abutted and positioned when the steering sub-groups are in a limit bending state, and a plurality of guiding sub-groups (19-1-10) are arranged in all the steering sub-groups.
  5. 5. The abrasive jet-based radial horizontal well production and injection increasing system according to claim 4, wherein the guiding wheel set (19-1-10) comprises a wheel shaft (19-1-10-2), two ends of the guiding wheel set are installed in corresponding shaft holes of the steering pup joint, the wheel shaft (19-1-10-2) is sleeved with a roller (19-1-10-3), and a clamping spring (19-1-10-1) is assembled in a clamping groove at the end part of the wheel shaft (19-1-10-2).
  6. 6. The abrasive jet-based radial horizontal well production and injection increasing system according to claim 1 is characterized by further comprising a fluid circulation unit, wherein the fluid circulation unit comprises a water tank (3), a sand box (4), a sand mixing vehicle (5) and a fracturing vehicle (6), the water tank (3) and the sand box (4) are respectively communicated with the sand mixing vehicle (5) through an atmospheric pressure pipeline (A), the sand mixing vehicle (5) is communicated with the fracturing vehicle (6) through the atmospheric pressure pipeline (A), the water tank (3) is communicated with an annulus through a backflow pipeline (B), and the fracturing vehicle (6) is communicated with a rotary faucet (7) through a high-pressure abrasive slurry conveying pipe (C).
  7. 7. The abrasive jet-based radial horizontal well production and injection increasing system according to claim 6, wherein the water tank (3) is communicated with the radial drilling unit through a high-pressure clean water conveying pipe (D), and the high-pressure clean water pump (13) is arranged on the high-pressure clean water conveying pipe (D).
  8. 8. The method for increasing the production and injection of the radial horizontal well based on the abrasive jet is characterized by comprising the following steps of: The method comprises the steps that (S1) a fluid circulation unit conveys high-pressure abrasive slurry to a forging milling reaming tool string (2) through a rotary faucet (7) to form abrasive straight jet flow (S), abrasive jet flow hydraulic forging milling and reaming impact is carried out on a sleeve (10), a well cementation cement ring (11) and a reservoir (12), and in the process, the forging milling reaming tool string (2) rotates and slowly lifts up to gradually form a reservoir cavity (K) in the reservoir (12); (S2) lowering the radial drilling tool string (19) to the reservoir cavity (K) and anchoring the radial drilling tool string to the inner wall of the casing (10), wherein the drill bit (19-2) stays in the piston (19-1-2); (S3) injecting high-pressure clean water into an annulus between the coiled tubing (17) and the radial drilling oil pipe (19-5) and into the coiled tubing (17), so that a piston (19-1-2) in the downhole steering device (19-1) pushes the steering short section groups to form a steering track, and guiding the metal drilling pipe (19-3) to finish steering from the vertical direction to the horizontal direction; (S4) after the drill bit (19-2) completely penetrates out of the steering short-period group, conveying high-pressure abrasive slurry into the radial drilling tool string (19) to form rotary abrasive jet (M), and performing radial horizontal rock breaking drilling on the reservoir (12) to form at least one radial reservoir horizontal borehole (T).
  9. 9. The abrasive jet based radial horizontal well stimulation method of claim 8, further comprising the steps of: And (S5) after completing a radial reservoir horizontal well bore (T), adjusting the drilling horizon or drilling direction of the radial drilling tool string (19) by releasing the anchoring state of the reversible anchor (19-4), and repeating the steps (S1) - (S4) to form a plurality of radial reservoir horizontal well bores (T) in the same well bore.

Description

Radial horizontal well yield and injection increasing system and method based on abrasive jet flow Technical Field The invention belongs to the field of oil and gas field development, and relates to a radial horizontal well yield and injection increasing system and method based on abrasive jet flow. Background In the field of oil and gas field development, in the development process of low-hole low-permeability reservoirs, thin-layer oil and gas reservoirs, tight sandstones, coalbed methane and unconventional energy sources, the drainage area is difficult to effectively expand by a traditional vertical well and a conventional well completion mode, the proportion of flow resistance near a shaft to total pressure drop is high, and the improvement of oil and gas yield and injection capacity is restricted. Therefore, how to improve the seepage condition of near-wellbore zone and the communication capability between a wellbore and a reservoir stratum on the premise of not fracturing on a large scale becomes a technical problem to be solved in the field of oil and gas development. In order to solve the above problems, radial horizontal well technology is gradually applied, and a plurality of horizontal holes are drilled around a shaft radially by means of a downhole steering device and a hydraulic rock breaking drill bit, so as to penetrate a near-well pollution zone, reduce flow pressure drop and realize yield increase or injection increase. Compared with the conventional horizontal well, the conventional radial horizontal well technology has the advantages of short well construction period, relatively simple ground equipment and the like, however, the conventional radial horizontal well technology has various shortcomings, and is mainly characterized in the following aspects. (1) In the stage of casing forging and milling and reservoir reaming, the prior art mostly adopts a mechanical forging and milling mode, construction links are more, working procedures are dispersed, grading or multi-pass operation is usually needed to finish, the mechanical forging and milling has higher requirements on tool strength, underground stability and construction window, the risks of drill sticking, block falling and the like are easy to occur under deep wells or old wells, and simultaneously, the reaming capability is obviously limited by stratum properties, and the application range is narrower. (2) In the process of rock breaking and drilling of radial horizontal holes, the prior art mostly adopts clear water jet flow as rock breaking medium, the method can be applied to middle and low strength stratum, but in hard stratum or high strength stratum, the rock breaking capacity is insufficient, the drilling speed is low, the hole forming quality is unstable, the actual engineering requirement is difficult to meet, and the popularization and application of the radial horizontal well technology in complex reservoirs are limited. (3) In the existing radial horizontal well technology, a mode of welding a plurality of short pipes is often used as a drilling pipe for drilling, the length of the drilling pipe is limited by the height of a derrick and ground operation conditions, and the horizontal footage is difficult to further extend. Meanwhile, the multi-section welding structure has the problems of sealing reliability and fatigue life under high pressure conditions, and is unfavorable for long-distance drilling operation. In summary, the existing radial horizontal well and related jet drilling technology still have obvious defects in the aspects of construction integration degree, rock breaking capacity, applicable stratum range, drilling footage control, operation efficiency and the like, and engineering application requirements under the condition of complex reservoir and old well reconstruction cannot be fully met. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a radial horizontal well production and injection increasing system and method based on abrasive jet flow, which utilize the strong erosion damage effect of the abrasive jet flow to implement hydraulic forging milling and reaming treatment on a casing section and a near-wellbore zone reservoir, integrate two key working procedures of casing forging milling and reservoir reaming into one tubular column operation process to reduce the problems of complex working procedures, long working period, underground risk accumulation and the like caused by staged construction and multi-trip tubular column lifting, and simultaneously, adopt an abrasive jet flow and continuous oil pipe mode to perform rock breaking drilling on a target reservoir in a radial horizontal hole drilling construction stage, realize multi-layer and multi-azimuth drilling through a downhole tool string, and form a plurality of radial horizontal holes under the cooperation of ground liquid supply, sand adding and flowback flow, thereby improving the communicati