CN-121993037-A - Drilling pressure regulation directional drilling system and method suitable for increasing yield or burying carbon dioxide

CN121993037ACN 121993037 ACN121993037 ACN 121993037ACN-121993037-A

Abstract

The invention relates to the technical field of drilling tools, in particular to a drilling pressure regulation directional drilling system and a drilling pressure regulation directional drilling method suitable for increasing yield or burying carbon dioxide, wherein the system comprises an upper drill string, an azimuth control assembly and a single-bending screw drilling tool which are sequentially connected from top to bottom; the azimuth control assembly comprises a barrel, wherein the upper end of the barrel is connected with the upper drill string, the lower end of the barrel is connected with the single-bending screw drilling tool, at least one contact block is connected to the inner wall of the barrel, the contact block is contacted with the outer peripheral surface of the upper drill string to form at least one group of friction pairs, and the friction pairs generate radial pressing force under the action of the weight of the drill applied to the upper drill string, so that an adjustable circumferential friction moment is provided for controlling the azimuth of the tool face of the single-bending screw drilling tool. The stable switching of the tool face angle can be realized only by adjusting the drilling pressure in a grading way without electronic or hydraulic control.

Inventors

GUO XING
LUO PAN
LIU WENCHUAN
ZHANG JUAN
TANG JIREN
SUN XIAO
GE ZHAOLONG
SHEN FENG
GUO SHUAI
XIAO CAIYUN
MU JINGFU
JIA YUNZHONG

Assignees

重庆大学
陕西延长石油（集团）有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260311

Claims (8)

1. The drilling pressure regulation and control directional drilling system suitable for increasing yield or burying carbon dioxide is characterized by comprising an upper drill column (1), an azimuth control assembly (2) and a single-bending screw drilling tool (3) which are sequentially connected from top to bottom; The azimuth control assembly (2) comprises a barrel (21), wherein the upper end of the barrel (21) is connected with the upper drill string (1), the lower end of the barrel (21) is connected with the single-bending screw drilling tool (3), the inner cavity of the barrel (21) is communicated with the upper drill string (1) and the inner flow path of the single-bending screw drilling tool (3) to form a channel (5) so as to ensure that drilling fluid or carbon dioxide flows from the ground to a bottom hole drill bit (6) through the upper drill string (1), the azimuth control assembly (2) and the single-bending screw drilling tool (3); the inner wall of the cylinder body (21) is connected with at least one contact block (22), and the contact block (22) is contacted with the outer peripheral surface of the upper drill string (1) to form at least one group of friction pairs; The friction pair generates radial pressing force under the action of bit pressure applied to the upper drill string (1), thereby providing adjustable circumferential friction moment for controlling the tool face azimuth of the single-bending screw drilling tool (3).
2. The drilling pressure regulating directional drilling system suitable for carbon dioxide production or sequestration according to claim 1, characterized in that the single-bend screw drilling tool (3) is provided with a preset bend angle, and in the state of applying the preset drilling pressure, the preset bend angle keeps pointing to the high side position of the well.
3. The controlled weight on bit directional drilling system for carbon dioxide stimulation or sequestration of water as claimed in claim 2, wherein the predetermined bend angle is 1.5 ° to 2 °.
4. The directional drilling system for increasing carbon dioxide production or burying drilling pressure according to claim 1, wherein at least one sealing ring (4) is arranged at the joint of the lower end of the azimuth control assembly (2) and the upper end of the single-bending screw drilling tool (3) and is used for sealing drilling fluid and preventing carbon dioxide gas from penetrating or leaking along a connecting gap.
5. The drilling pressure regulating directional drilling system suitable for increasing yield or burying of carbon dioxide as set forth in claim 1, wherein said friction pair is a plurality of groups of contact blocks (22) uniformly distributed along the circumferential direction of the inner wall of said barrel (21) to maintain symmetry and stability of radial stress during downhole loading.
6. The pressure-on-bit regulated directional drilling system for carbon dioxide stimulation or sequestration of water according to claim 1, wherein the geometry of the contact surfaces of each set of friction pairs cooperating with each other is selected from planar, cambered or wedge-shaped structures.
7. A drilling pressure regulation directional drilling method suitable for increasing yield or burying carbon dioxide is characterized by adopting the drilling pressure regulation directional drilling system suitable for increasing yield or burying carbon dioxide according to any one of claims 1-6 to drill, and comprises the steps of applying a first preset drilling pressure to an upper drill column (1), enabling circumferential friction torque generated by a friction pair to lock a tool face azimuth of a single-bending screw drilling tool (3) to enable the preset bent angle to point to a high-side position of a well hole, performing inclination increasing drilling, adjusting the drilling pressure to a second preset drilling pressure when the drilling azimuth is required to be changed, enabling the friction state of the friction pair to change, enabling the single-bending screw drilling tool (3) to rotate to a new tool face azimuth relative to a cylinder (21), maintaining the second preset drilling pressure, and locking the tool face azimuth again, and performing directional drilling in a new direction.
8. The method of directional drilling with weight on bit control for carbon dioxide stimulation or sequestration of a wellbore according to claim 7, wherein the step of adjusting the weight on bit comprises the steps of: -the azimuth control assembly (2) stabilizes the toolface angle of the single-bend screw drilling tool (3) in a first lateral orientation for drilling of a first branch wellbore (8) when the weight-on-bit applied to the upper drill string (1) is a first threshold; -when the weight-on-bit applied to the upper drill string (1) is a second threshold value, the second threshold value being greater than the first threshold value, the azimuth control assembly (2) stabilizing the toolface angle of the single-turn screw drilling tool (3) in the main wellbore direction for drilling of a main wellbore (7); -when the weight-on-bit applied to the upper drill string (1) is a third threshold value, the third threshold value being greater than the second threshold value, the azimuth control assembly (2) stabilizing the toolface angle of the single-curved screw drilling tool (3) in a second lateral orientation for drilling of a second borehole (9); The first lateral azimuth and the second lateral azimuth are respectively positioned at two sides of the main well bore (7), and the main well bore (7), the first branch well bore (8) and the second branch well bore (9) jointly form a fishbone-shaped well bore track so as to increase the contact area between the well bore and the reservoir and improve the injection efficiency and the sweep range of carbon dioxide.

Description

Drilling pressure regulation directional drilling system and method suitable for increasing yield or burying carbon dioxide Technical Field The invention relates to the technical field of drilling tools, in particular to a drilling pressure regulation directional drilling system and method suitable for increasing yield or burying carbon dioxide. Background Under the dual drive of continuous increase of global energy demand and increasing of carbon emission reduction pressure, carbon dioxide yield increase or sequestration and sequestration technology has become a key path for improving oil and gas recovery efficiency and achieving greenhouse gas emission reduction targets. Injected during carbon dioxide floodingCan effectively reduce the viscosity of crude oil, expand the volume of crude oil and improve the fluidity of crude oil, thereby obviously improving the recovery ratio of an oil field, and in the carbon dioxide geological storage scene, the oil field is required to be recoveredThe carbon sealing device is safely sealed in a deep salty water layer or a depleted oil and gas reservoir for a long time so as to ensure the reliability and environmental safety of carbon sealing. In addition, supercriticalBecause of its excellent thermophysical properties, it has also been widely used in recent years in enhanced geothermal systems, exhibiting higher heat extraction efficiency and lower risk of reservoir damage than conventional water-based working fluids. However, the above-mentioned relates toIn the drilling operation of (2), the existing mainstream rotary steering system (Rotary Steerable System, RSS) generally relies on an electronic control unit or a hydraulic actuator to realize the well track regulation. At high pressure and high Wen Naizhi supercriticalIn the environment, the system faces serious challenges that on one hand, electronic components are easy to corrode and fail, and on the other hand, the hydraulic sealing element has leakage risk in long-term service, so that not only is the guiding precision influenced, but also the downhole tool clamping stagnation or functional failure can be caused, and the stability and safety of drilling operation are seriously restricted. In addition, conventional RSS has limited ability to fine control borehole trajectory in complex heterogeneous formations, which is difficult to meetThe requirement of injection wells, production wells and geothermal wells on high-precision spatial well arrangement further influences oil displacement sweep efficiency, sealing integrity and geothermal energy extraction effect. Disclosure of Invention The invention aims to provide a drilling pressure regulation directional drilling system and a drilling pressure regulation directional drilling method suitable for increasing yield or burying carbon dioxide, which can realize stable switching of a tool face angle only by regulating drilling pressure in a grading way without electronic or hydraulic control. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The application provides a drilling pressure regulation and control directional drilling system suitable for increasing yield or burying carbon dioxide, which comprises an upper drill string, an azimuth control assembly and a single-bending screw drilling tool, wherein the upper drill string, the azimuth control assembly and the single-bending screw drilling tool are sequentially connected from top to bottom, the azimuth control assembly comprises a cylinder, the upper end of the cylinder is connected with the upper drill string, the lower end of the cylinder is connected with the single-bending screw drilling tool, an inner cavity of the cylinder is communicated with the upper drill string and an inner flow passage of the single-bending screw drilling tool so as to ensure that drilling fluid or carbon dioxide flows from the ground to a drill bottom through the upper drill string, the azimuth control assembly and the single-bending screw drilling tool, at least one contact block is connected to the inner wall of the cylinder, the contact block is in contact with the outer peripheral surface of the upper drill string to form at least one group of friction pairs, and the friction pairs generate radial pressing force under the action of the drilling pressure applied to the upper drill string so as to provide adjustable circumferential friction moment for controlling the azimuth of a tool face of the single-bending screw drilling tool. Further, the single-bending screw drilling tool is provided with a preset bent angle, and the preset bent angle keeps pointing to the high-side position of the well hole in the state of applying the bit pressure. Further, the preset bent angle is 1.5 ° to 2 °. Further, the joint of the lower end of the azimuth control assembly and the upper end of the single-bending screw drilling tool is provided with at least one sealing ring for sealing drilling fluid