阅读说明：本技术 堵漏控制阀及控制方法 (Leakage stoppage control valve and control method ) 是由 王传德 宫晋武 宫晋刚 张永红 于 2019-10-21 设计创作，主要内容包括：本发明属于石油天然气钻井作业中随钻堵漏设备技术领域,具体是一种堵漏控制阀及控制方法。包括上接头、中筒和下接头,中筒上下两端分别连接上接头和下接头,中筒内部设置有芯轴,芯轴上端通过活塞总成与中筒内壁固定,芯轴下端通过平衡活塞总成与中筒内壁固定,中筒内侧还固定有限位套,芯轴从限位套穿过,芯轴与限位套之间安装复位弹簧,复位弹簧下端与限位套固定,复位弹簧上端与安装在芯轴外侧的活塞头组件固定,上接头、下接头以及芯轴内部中空且互相连通成内部孔,活塞总成顶部设置有用于放置击发球的阀座,所述的中筒上设置有侧孔,侧孔的位置设置在当复位弹簧处于压缩状态时芯轴中间的孔可以与其连通。(The invention belongs to the technical field of leakage stoppage equipment while drilling in petroleum and natural gas drilling operation, and particularly relates to a leakage stoppage control valve and a control method. Including top connection, well section of thick bamboo and lower clutch, connect top connection and lower clutch respectively at both ends about the well section of thick bamboo, the inside dabber that is provided with of well section of thick bamboo, it is fixed with well section of thick bamboo inner wall that the dabber upper end passes through piston assembly, the dabber lower extreme is fixed with well section of thick bamboo inner wall through balanced piston assembly, well section of thick bamboo inboard still is fixed with the stop collar, the dabber passes from the stop collar, installation reset spring between dabber and the stop collar, reset spring lower extreme is fixed with the stop collar, the reset spring upper end is fixed with the piston head subassembly of installing in the dabber outside, top connection, lower clutch and the inside cavity of dabber and communicate into the inside hole mutually, the piston assembly top is provided with the disk seat that is used for placing the batting, well section of thick bamboo on be provided with the side opening.)

1. A leaking stoppage control valve is characterized in that: the device comprises an upper joint (1), a middle cylinder (5) and a lower joint (6), wherein the upper end and the lower end of the middle cylinder (5) are respectively connected with the upper joint (1) and the lower joint (6), a mandrel (7) is arranged in the middle cylinder (5), the upper end of the mandrel (7) is fixed with the inner wall of the middle cylinder (5) through a piston assembly (3), the lower end of the mandrel (7) is fixed with the inner wall of the middle cylinder (5) through a balance piston assembly (8), a limiting sleeve (4) is further fixed on the inner side of the middle cylinder (5), the mandrel (7) penetrates through the limiting sleeve (4), a reset spring (9) is arranged between the mandrel (7) and the limiting sleeve (4), the lower end of the reset spring (9) is fixed with the limiting sleeve (4), the upper end of the reset spring (9) is fixed with a piston head assembly (10) arranged on the outer side of the mandrel (7), the upper joint (1), the lower joint (6), the top of the piston assembly (3) is provided with a valve seat for placing the firing ball (2), the middle cylinder (5) is provided with a side hole (11), and the position of the side hole (11) is arranged in a hole in the middle of the mandrel (7) when the return spring (9) is in a compression state and can be communicated with the side hole.

2. A control method of a lost circulation control valve according to claim 1, characterized in that: comprises the following steps of (a) carrying out,

s1, arranging the leakage stoppage control valve in a drill hole, wherein under the normal working condition, the inner hole of the leakage stoppage control valve is in a normally open state, and drilling fluid can freely pass through the leakage stoppage control valve and act on a lower drilling tool to carry out normal drilling operation;

s2, when a lost circulation stratum is met or a lost circulation phenomenon occurs, the percussion ball (2) is thrown into an inner hole of the drilling tool on the ground, and when the percussion ball runs to the piston assembly (3), the percussion ball is pressed against a valve seat of the piston assembly to be seated;

s3, when the pump pressure rises at the moment, the setting of the shot ball (2) is successful, the piston assembly (3) descends when the pump pressure is continuously increased to a set value, the side hole in the middle cylinder (5) is opened at the moment, a circulating channel is established between the surface and the annulus, and the injection work of the plugging agent can be carried out;

s4, when the plugging operation is completed and the side hole of the middle cylinder (5) needs to be closed, the pump pressure is adjusted to increase and then decrease the piston, namely, the piston ascends, so that the side hole is closed, and the channel between the inner hole of the pipe string and the annulus is cut off.

3. At the moment, drilling fluid at the upper part of the tool can smoothly enter an inner hole of the lower pipe string through a side hole on the piston assembly (3), so that normal drilling operation can be carried out;

s5-when the side hole on the middle barrel (5) needs to be opened for the second time, the steps S1-S4 are repeated.

Technical Field

The invention belongs to the technical field of leakage stoppage equipment while drilling in petroleum and natural gas drilling operation, and particularly relates to a leakage stoppage control valve and a control method.

Background

At present, in the petroleum and natural gas drilling operation, the easily-leaked stratum is often encountered, so the requirement on leakage stoppage while drilling is increasingly urgent. The tool with the related functions is required to be convenient to use, safe and reliable.

At present, the research on the tools in China is just started, and the developed products have the defects, for example, most manufacturers activate the leakage stopping valve in a mode that 2 ~ 4 balls are put in to complete one-time opening and closing function, and if the opening and closing actions are required to be completed for multiple times, multiple shots are needed to complete the opening and closing actions, so the risk is brought:

1) unexpected risks (such as jamming or incapability of sending the ball to a target position) are easy to occur when the ball runs in the drilling pipe string, and operation difficulty is caused from the surface;

2) after each pitching, the ground is not easy to judge whether the ball is in place;

3) the number of times of the on-off circulation of the tool is limited, and the tool is not ideal generally about 6 cycles;

4) the ball thrown into the well needs to be specially collected and is not allowed to continuously descend, so that the cost of the tool is increased due to the special design of the ball receiver;

5) due to the adoption of the ball receiver, a connecting port is added to the pipe string, so that one more risk is brought to the surface;

6) the adoption of the ball receiver leads the length of the leak-stopping valve to be longer, which increases the difficulty for transportation and connection. The opening of the leakage stoppage valve is completed by adopting a ball throwing activation mode, but the defect is that the ball throwing times are required and limited.

Disclosure of Invention

The invention provides a leakage stoppage control valve and a control method in order to realize one-time ball throwing and unlimited switching operation, really realize leakage stoppage operation while drilling, and solve the problems that a plurality of balls are not required to be thrown in and a downhole ball receiving bin is not required to be specially designed.

The invention adopts the following technical scheme: the utility model provides a leaking stoppage control valve, including the top connection, well section of thick bamboo and lower clutch, upper and lower both ends are connected respectively and are connected top connection and lower clutch about the well section of thick bamboo, the inside dabber that is provided with of well section of thick bamboo, the dabber upper end is fixed with well section of thick bamboo inner wall through piston assembly, the dabber lower extreme is fixed with well section of thick bamboo inner wall through balanced piston assembly, well section of thick bamboo inboard still is fixed with the stop collar, the dabber passes from the stop collar, installation reset spring between dabber and the stop collar, the reset spring lower extreme is fixed with the stop collar, reset spring upper end is fixed with the piston head subassembly of installing in the dabber outside, the top connection, the inside cavity of lower clutch and dabber and communicate into the inside hole mutually, piston assembly top is provided with the disk seat that is used for placing the batting ball, well section of thick. The mandrel can move as a piston in the middle cylinder, and the mandrel and the middle cylinder are sealed by a traditional sealing structure.

A control method of a leakage stoppage control valve comprises the following steps,

s1, the leakage stoppage control valve is arranged in a drill hole, under the normal working condition, the inner hole of the leakage stoppage control valve is in a normally open state, and drilling fluid can freely pass through the leakage stoppage control valve and act on a lower drilling tool to carry out normal drilling operation.

S2, when a lost circulation stratum is met or a lost circulation phenomenon occurs, the percussion ball is thrown into an inner hole of the drilling tool on the ground, and when the percussion ball runs to the piston assembly, the percussion ball is pressed against a valve seat of the piston assembly to be seated.

S3, when the pump pressure rises at the moment, the setting of the exciting ball is successful, the piston assembly descends when the pump pressure is continuously increased to a set value, the side hole in the middle cylinder is opened at the moment, a circulation channel is established between the surface and the annulus, and the injection of the plugging agent can be carried out.

S4, when the plugging operation is completed and the side hole of the middle cylinder needs to be closed, the pump pressure is adjusted to increase and then decrease the piston to move upwards, so that the side hole is closed, and the channel between the inner hole of the pipe string and the annulus is cut off. At the moment, the drilling fluid at the upper part of the tool can smoothly enter the inner hole of the lower pipe string through the side hole on the piston assembly, so that normal drilling operation can be carried out.

S5, when the side hole on the middle cylinder needs to be opened for the second time, the steps S1-S4 are repeated.

Compared with the prior art, the invention can be switched on and off for unlimited times after one-time ball throwing, and the ball throwing is not needed in the subsequent operation; the unlimited times of switching functions of the tool can be realized only by one ball, and the operation is simple and practical; the ball runs safely and reliably, and runs in the pipe string with zero risk before being in place. The ball is not separated after being positioned on the valve seat and is always kept in the inner cavity of the tool, so that descending risk is avoided, a ball receiver does not need to be specially designed, and the cost is saved; the risk of one more interface of pipe cluster is reduced. The invention has the characteristic of multifunction, and is suitable for severe cold areas, high-temperature and high-pressure working conditions, well conditions containing hydrogen sulfide and the like. The invention has low cost and high cost performance. The installation is simple and convenient, the structure is well designed, and the safety and the reliability are rare tools for users of the current drilling operation. The invention is green and environment-friendly (because only one ball is adopted for excitation operation, the pollution phenomenon of multi-ball recycling waste treatment is avoided).

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure, 1-an upper joint, 2-a striking ball, 3-a piston assembly, 4-a limiting sleeve, 5-a middle cylinder, 6-a lower joint, 7-a mandrel, 8-a balance piston assembly, 9-a return spring, 10-a piston head assembly and 11-a side hole.

Detailed Description

As shown in figure 1, an HJ-0901 type leak-stopping control valve comprises an upper joint 1, a middle cylinder 5 and a lower joint 6, wherein the upper end and the lower end of the middle cylinder 5 are respectively connected with the upper joint 1 and the lower joint 6, a mandrel 7 is arranged in the middle cylinder 5, the upper end of the mandrel 7 is fixed with the inner wall of the middle cylinder 5 through a piston assembly 3, the lower end of the mandrel 7 is fixed with the inner wall of the middle cylinder 5 through a balance piston assembly 8, a stop collar 4 is further fixed on the inner side of the middle cylinder 5, the mandrel 7 penetrates through the stop collar 4, a return spring 9 is arranged between the mandrel 7 and the stop collar 4, the lower end of the return spring 9 is fixed with the stop collar 4, the upper end of the return spring 9 is fixed with a piston head assembly 10 arranged on the outer side of the mandrel 7, the upper joint 1, the lower joint 6 and the mandrel 7 are hollow and are mutually communicated into an inner hole, a valve seat for placing, the position of the side hole 11 is such that the hole in the middle of the spindle 7 can communicate with it when the return spring 9 is in the compressed state. The mandrel 7 and the middle cylinder 5 are sealed by adopting a traditional sealing method.

A control method of a leakage stoppage control valve comprises the following steps,

s1, the leakage stoppage control valve is arranged in a drill hole, under the normal working condition, the inner hole of the leakage stoppage control valve is in a normally open state, and drilling fluid can freely pass through the leakage stoppage control valve and act on a lower drilling tool to carry out normal drilling operation.

S2, when a lost circulation stratum is met or a lost circulation phenomenon occurs, the percussion ball 2 is thrown into an inner hole of the drilling tool on the ground, and when the percussion ball runs to the piston assembly 3, the percussion ball is in collision pressure setting with a valve seat of the percussion ball.

S3, when the pump pressure rises at the moment, the setting of the shot ball 2 is successful, the piston assembly 3 descends when the pump pressure is continuously increased to a set value, the side hole on the middle cylinder 5 is opened at the moment, a circulating channel is established between the surface and the annulus, and the injection of the plugging agent can be carried out.

S4, when the plugging operation is completed and the side hole of the middle cylinder 5 needs to be closed, the pump pressure is adjusted to increase and then decrease the piston to move upwards, so that the side hole is closed, and the channel between the inner hole of the pipe string and the annulus is cut off. At this time, the drilling fluid on the upper part of the tool can smoothly enter the inner hole of the lower pipe string through the side hole on the piston assembly 3, so that normal drilling operation can be carried out.

S5, when the side hole on the middle barrel 5 needs to be opened for the second time, the steps S1-S4 are repeated.