CN110984891A

CN110984891A - Horizontal well downhole throttling process pipe column and method

Info

Publication number: CN110984891A
Application number: CN201911229909.3A
Authority: CN
Inventors: 姜勇; 桂捷; 张宏福; 刘锐; 马得华; 张安康; 王嘉鑫; 赵晓伟; 仵海龙; 赵伟轩
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-04-10
Anticipated expiration: 2039-12-04
Also published as: CN110984891B

Abstract

The invention discloses a horizontal well downhole throttling process pipe column and a method, comprising a downhole throttling device setting process pipe column and a downhole throttling device drilling and grinding process pipe column; the setting process tubular column of the downhole choke comprises a first continuous oil pipe, one end, extending into a horizontal well, of the continuous oil pipe is connected with a first double-valve check valve through a first connector, the free end of the first double-valve check valve is connected with a first shearing releasing tool, the free end of the first shearing releasing tool is connected with a hydraulic throwing tool, and the free end of the hydraulic throwing tool is connected with the downhole choke; the drilling and grinding process pipe column of the underground throttler comprises a second double-flap check valve connected to the end part of a second continuous oil pipe through a second connector, the free end of the second double-flap check valve is connected with a second shearing release, the free end of the second shearing release is connected with a screw drilling tool through a circulating joint, and the free end of the screw drilling tool is connected with a drill bit. The horizontal well throttling device can be arranged at any position of a horizontal section as required, and the best effect of the horizontal well downhole throttling is ensured.

Description

Horizontal well downhole throttling process pipe column and method

Technical Field

The invention relates to a throttling and pressure reducing underground process pipe column in a natural gas production process, which is suitable for a gas well horizontal well with a self-flowing capacity.

Background

Horizontal wells have incomparable advantages in technical and economic benefits compared with conventional vertical wells, and have been widely used in the development of gas reservoirs with the development of drilling and oil (gas) production technologies. In the middle and later stages of gas well production, the accumulated liquid in a shaft is intensified, and drainage and gas production are effective methods for solving the accumulated liquid in the gas well. The underground throttling process technology is a process technology for enabling the throttling depressurization process of natural gas to occur in a shaft of a gas well through an underground throttle, is a water drainage and gas production technology with the advantages of being good in water drainage and gas production effect, simple to operate, low in cost and the like, and is widely applied to gas well production. Because of the limitation of the existing process conditions, the current gas well underground throttler is only installed in a shaft of a vertical well section, the spread range is limited, the water and gas drainage effect of the underground throttler exponentially decreases along with the lengthening of a horizontal section, and the underground throttler hardly has the effect particularly when the water yield is large in the middle and later development periods.

Disclosure of Invention

The invention aims to provide a horizontal well downhole throttling process pipe column and a method, which solve the defect that a conventional downhole throttling device can only be arranged at a straight well section.

In order to achieve the purpose, the invention adopts the following technical scheme:

a horizontal well downhole throttling process pipe column comprises a downhole throttling device setting process pipe column when setting a downhole throttling device and a downhole throttling device drilling and grinding process pipe column when pulling out the downhole throttling device;

the setting process tubular column of the underground throttler comprises a first continuous oil pipe arranged on a continuous oil pipe operating machine, one end, extending into a horizontal well, of the first continuous oil pipe is connected with a first double-flap check valve through a first connector, the free end of the first double-flap check valve is connected with a first shearing releasing hand, the free end of the first shearing releasing hand is connected with a hydraulic throwing tool, and the free end of the hydraulic throwing tool is connected with the underground throttler;

the drilling and grinding process pipe column of the underground throttler comprises a second continuous oil pipe arranged on a continuous oil pipe operating machine, the end part of the second continuous oil pipe is connected with a second double-flap check valve through a second connector, the free end of the second double-flap check valve is connected with a second shearing release, the free end of the second shearing release is connected with a screw drilling tool through a circulating joint, and the free end of the screw drilling tool is connected with a drill bit.

A downhole throttling method for a horizontal well comprises a setting process and a drilling and grinding process;

the setting process specifically comprises the following steps: firstly, carrying out well-flushing operation, connecting a first connector to the tail end of a first continuous oil pipe, sequentially connecting a first double-valve check valve, a first shearing releasing tool, a hydraulic releasing tool and an underground throttler on the first connector, taking the first connector, the first double-valve check valve, the first shearing releasing tool, the hydraulic releasing tool and the underground throttler as a well-descending tool string, releasing a ball corresponding to the hydraulic releasing tool after the well-descending tool string is put in place, and adding hydraulic pressure to 20MPa from the first continuous oil pipe when the ball falls onto the hydraulic releasing tool to realize releasing and setting of the underground throttler;

the drilling and grinding process specifically comprises the following steps: firstly, the well is flushed, then a drilling and grinding process pipe column of the underground choke is put into the well until the distance between the drilling and grinding process pipe column and the underground choke is 1m-2m, and the oil is injected into the well from a second continuous oil pipe by 0.2 m-0.3 m³The displacement of (a) is controlled,and driving the screw drilling tool to drive the drill bit to work, putting down the drilling and grinding process pipe column of the downhole choke and washing the surface of the downhole choke, and controlling the bit pressure to be 5kN-15kN until the downhole choke is free from constraint.

Compared with the prior art, the invention has the following beneficial technical effects:

the continuous oil pipe is adopted to drag the downhole choke to replace a conventional steel wire to drag the downhole choke, the downhole choke can be lowered to any position of a horizontal section, the optimal downhole choke effect is achieved, after the continuous oil pipe drags the downhole choke to a specified position, the downhole choke is set in a hydraulic mode, the tool string is simple in structure and reliable in setting, fishing is not needed when the downhole choke needs to be removed, drilling and grinding of the downhole choke are removed only through a drilling and grinding process pipe string, and the removing method is safe and reliable.

Drawings

FIG. 1 is a schematic diagram of a downhole throttling process pipe string of a horizontal well;

FIG. 2 is a schematic diagram of a downhole choke drilling and grinding process string.

In the figure, 1, a first continuous oil pipe, 2, a first connector, 3, a first double-flap check valve, 4, a first shear release, 5, a hydraulic throwing tool, 6, a downhole choke, 7, a second continuous oil pipe, 8, a second connector, 9, a second double-flap check valve, 10, a second shear release, 11, a circulation joint, 12, a screw drill and 13, a drill bit.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1 and 2, the horizontal well downhole throttling process tubular column adopted by the invention comprises a downhole throttling setting process tubular column when setting the downhole throttling device and a downhole throttling drilling and grinding process tubular column when tripping the downhole throttling device, wherein the downhole throttling setting process tubular column comprises a first continuous oil pipe 1, a first connector 2, a first double-disc check valve 3, a first shearing release 4, a hydraulic releasing tool 5 and a downhole throttling device 6, the first continuous oil pipe 1 is connected with the first double-disc check valve 3 through the first connector 2, the lower end of the first double-disc check valve 3 is connected with the first shearing release 4, the lower end of the first shearing release 4 is connected with the hydraulic releasing tool 5, and the lower end of the hydraulic releasing tool 5 is connected with the downhole 6; the drilling and grinding process pipe column of the downhole choke comprises a second double-flap check valve 9 connected to the end part of a second continuous oil pipe 7 through a second connector 8, the free end of the second double-flap check valve 9 is connected with a second shearing release 10, the free end of the second shearing release 10 is connected with a screw drilling tool 12 through a circulating joint 11, and the free end of the screw drilling tool 12 is connected with a drill bit 13.

The present invention is described in detail below with reference to examples:

referring to fig. 1 and 2, the downhole throttling process string of the horizontal well is used as follows:

1. setting seal

The well is flushed to ensure that the shaft is clean; connecting the well-assembled underground throttler 6 with a coiled tubing hydraulic delivery tool string, wherein the underground tool string is from top to bottom: the first connector 2+ the first double-valve check valve 3+ the first shearing releasing tool 4+ the hydraulic releasing tool 5+ the downhole choke 6, after the tool string is put in place, a ball corresponding to the hydraulic releasing tool is released, and when the ball falls onto the hydraulic releasing tool 5 and the hydraulic pressure is added to 20MPa from the continuous oil pipe, releasing and setting of the downhole choke 6 are achieved.

2. Drilling and grinding machine

When the underground throttler needs to be removed, the well is flushed; the drilling and grinding process pipe column of the downhole choke is put into the downhole choke to 1m-2m, and 0.2-0.3m is injected from the coiled tubing³The screw drilling tool is driven to drive the drill bit to work, the drilling and grinding process pipe column of the downhole choke is lowered, and after the surface of the downhole choke 6 is washed, the bit pressure is controlled to be 5kN-15kN until the downhole choke is free of constraint.

Claims

1. a horizontal well downhole choke process string, it is characterized in that, comprise the downhole choke setting process pipe string when setting the downhole choke and the downhole choke when pulling out the downhole choke Drilling and grinding process string;

The downhole choke setting process pipe string comprises a first coiled tubing (1) arranged on a coiled tubing machine, and one end of the first coiled tubing (1) extending into the horizontal well is connected with a first connector (2). A first double-lobed single-flow valve (3), the free end of the first double-lobed single-flow valve (3) is connected with a first shear drop hand (4), and the free end of the first shear drop hand (4) is connected with a a hydraulic release tool (5), the free end of the hydraulic release tool (5) is connected with a downhole choke (6);

The downhole choke drilling and grinding process pipe string comprises a second coiled tubing (7) arranged on a coiled tubing machine, and the end of the second coiled tubing (7) is connected with a second double-lobed via a second connector (8). The one-flow valve (9), the free end of the second double-lobed one-flow valve (9) is connected with a second shear drop (10), and the free end of the second shear drop (10) passes through a circulation joint (11) A screw drilling tool (12) is connected, and a drill bit (13) is connected to the free end of the screw drilling tool (12).

2. a horizontal well downhole throttling method, adopting a horizontal well downhole throttling process pipe string according to claim 1, it is characterized in that, comprises setting process and drilling and grinding process;

The setting process is specifically as follows: firstly, the well flushing operation is performed, then the first connector (2) is connected to the end of the first coiled tubing (1), and the first double valve is connected to the first connector (2) in sequence A check valve (3), a first shearing throw (4), a hydraulic throwing tool (5) and a downhole choke (6), the first connector (2), the first double flap check valve (3) ), the first shearing throw (4), the hydraulic throwing tool (5) and the downhole choke (6) as the downhole tool string. After the downhole tool string is in place, throw the ball corresponding to the hydraulic throwing tool. When falling onto the hydraulic release tool (5), add hydraulic pressure from the first coiled tubing (1) to 20MPa, so that the downhole choke (6) can be dropped and set;

The drilling and grinding process is specifically as follows: firstly carry out the well flushing operation, then run the downhole choke drilling and grinding process pipe string to a distance of 1m-2m from the downhole choke (6), and inject 0.2 m from the second coiled tubing (7). ^-0.3m3 displacement, drive the screw drilling tool (12) to drive the drill bit (13) to work, run down the downhole choke drilling and grinding process pipe string after flushing the surface of the downhole choke (6), control the WOB 5kN-15kN , until the downhole choke (6) is released.