CN204511374U - One can reverse circulating leak stopping bypass valve - Google Patents

Abstract

The utility model provides a plugging and bypass valve capable of reverse circulation, which includes a shell, a steel ball, a valve body, the center of the valve body is a valve body through hole; the center of the shell is a shell through hole, and the side wall of the shell is There is a bypass channel; the shell is connected with the lower connecting piece, the valve body is inserted into the upper section of the through hole of the shell, a spring is arranged between the lower end of the valve body and the lower connecting piece, the upper end of the through hole of the valve body acts on the steel ball, and the valve The diameter of the upper end of the body through hole is smaller than the diameter of the steel ball. When the difference between the pressure acting on the upper part of the steel ball is greater than the pressure acting on the lower part of the steel ball reaches a certain threshold, the steel ball moves downward to make the upper end of the through hole of the shell It communicates with the bypass channel on the shell. The bypass valve can be used many times without tripping in and out, and is widely used in drilling, completion, and workover. It has a simple structure, convenient use, low failure rate, and high cost performance, which can greatly reduce the risk and difficulty of accident handling. It saves the accident handling time and reduces the drilling cost.

Description

A plugging and bypass valve capable of reverse circulation

technical field

The utility model relates to a bypass valve, in particular to a plugging and bypass valve capable of reverse circulation for well drilling.

Background technique

Lost circulation is one of the common downhole complex situations in the drilling process. It consumes drilling time, loses mud, may cause a series of complicated situations such as pipe sticking, blowout, and well collapse, and even lead to the scrapping of the wellbore, resulting in major economic losses. Due to the harm caused by lost circulation, leak prevention and plugging technology has been developed rapidly. At present, bridging and plugging materials, chemical plugging agents, high water loss plugging agents, one-way pressure sealing agents and various plugging materials have been researched and developed. Many new plugging materials such as thick slurry leakage. In the process of dealing with lost circulation in drilling engineering, for fractured leakage with small permeability loss, the plugging agent and carrier fluid (with relatively low density) are usually mixed on the ground through mud pumps, and then injected downhole and squeezed into the formation, which can play a role in sealing. However, when encountering large and large-scale leakage, it is necessary to use larger-sized materials for plugging. At this time, it is difficult to mix the plugging material into the drilling fluid and send it to the lost formation through mud pumping. In addition, The expansibility and time requirements of expansive organic plugging materials are very strict, and the construction requirements are high, and the general bypass valve will have a drilling and drilling process after use, which wastes a lot of time and requires a special plugging valve. The leak bypass valve delivers the leak plugging material to the leak layer.

Contents of the invention

In order to provide a plugging material with a larger size, and considering the expansion requirements of the plugging material and the strict requirements of the plugging time, the utility model can be used for many times without the process of drilling and drilling. A new plugging and bypass valve capable of reverse circulation, including a shell, a steel ball, and a valve body, characterized in that the valve body is a hollow structure, and the center is a through hole of the valve body; the shell is a hollow structure , the center is the through hole of the shell, the two ends of the through hole of the shell are respectively connected with the upper and lower connecting holes, and the side wall of the shell is provided with a plurality of bypass passages that make the through hole of the shell communicate with the outside of the shell; The lower connecting hole of the housing is connected to the lower connecting piece, the valve body is inserted into the upper section of the through hole of the housing, and a spring is provided between the lower end of the valve body and the lower connecting piece, the The upper end of the through hole of the valve body acts on the steel ball. The diameter of the upper end of the through hole of the valve body is smaller than the diameter of the steel ball. When the pressure acting on the upper part of the steel ball is greater than the pressure acting on the lower part of the steel ball, the difference reaches a certain threshold. The steel ball moves downward so that the upper end of the shell through hole communicates with the bypass channel on the shell so that the plugging slurry can pass through normally.

Further, the upper end of the lower connecting piece in the through hole of the housing is provided with a sliding sleeve, the sliding sleeve passes through the spring, the lower end of the sliding sleeve acts on the lower connecting piece, and the sliding sleeve’s The upper end acts on the lower end of the through hole of the valve body.

Further, an elastic snap ring groove is provided at the upper end of the through hole of the housing, and an elastic snap ring is disposed therein to limit the upward movement of the valve body.

Further, sealing grooves are provided on both sides of the bypass channel on the through hole of the housing, and sealing elements are arranged in the sealing grooves.

Further, the upper and lower connecting holes of the housing are provided with TBG oil pipe threads or pipe threads.

The plugging and bypass valve of the utility model can be widely used in drilling, well completion and workover. It has simple structure, convenient use, low failure rate, high cost performance, can be used for many times, and does not need to be drilled and tripped after each use. , can greatly reduce the risk and difficulty of accident handling. The plugging bypass valve of the utility model can realize the fixed-point feeding and squeezing tasks of high-concentration large-particle materials and long-fiber plugging materials into the leakage layer, and can improve the pertinence of plugging. The use efficiency of plugging materials and the pertinence of plugging. If the lost zone is clear and the lost section is small, high-concentration slug plugging can be used as the first choice to deal with sudden large lost circulation, which has good promotion value.

Description of drawings

Fig. 1 is a structural schematic diagram of a plugging and bypass valve capable of reverse circulation in the present invention.

Reference signs:

1-spring, 2-valve body, 21-valve body through hole, 3-elastic snap ring, 4-steel ball, 5-shell, 51-bypass channel, 52-seal groove, 53-upper connection hole, 54- Lower connecting hole, 55-housing through hole, 6-sliding cylinder, 7-lower connecting piece.

Detailed ways

Fig. 1 is a structural schematic diagram of the plugging and bypass valve capable of reverse circulation of the present invention, and the plugging and bypass valve of the present invention capable of reverse circulation will be described in conjunction with Fig. 1 .

As shown in Figure 1, the plugging bypass valve that can reverse circulation, the bypass valve includes a housing 5, a steel ball 4, and a valve body 2, the valve body 2 is a hollow structure, and the center is a through hole of the valve body 21. The housing 5 is a hollow structure with a housing through hole 55 in the center. A bypass channel 51 that makes the housing through hole 55 communicate with the outside of the housing; the lower connecting hole 54 of the housing is connected with the lower connecting piece 7, and the valve body 2 is inserted into the upper section of the housing through hole 21 , a spring 1 is provided between the lower end of the valve body 2 and the lower connecting piece 7. In normal use, there is no steel ball 4 in the bypass valve, and the pressure difference between the upper and lower ends of the valve body 2 is not enough to drive the valve. Body 2 moves downward, and the bypass channel 51 is not connected with the through hole of the casing. When the downhole drill bit cannot realize normal circulation, it is easy to get stuck. At this time, the steel ball is lowered from the inlet. When the upper end of the through hole 21 of the valve body interacts, because the diameter of the upper end of the through hole 21 of the valve body is smaller than the diameter of the steel ball 4, the passage is blocked, and the pressure acting on the upper part of the steel ball 4 gradually increases. When the pressure difference at the lower part of the steel ball 4 reaches a certain threshold, the steel ball 4 moves downward, so that the upper end of the through hole of the housing 5 communicates with the bypass channel 51 on the housing.

In order to ensure that the bypass valve of the present utility model is in normal use, the contact between the mud in the flow channel and the spring 1 is reduced, thereby increasing the service life of the bypass valve. The upper end of the member 7 is provided with a sliding tube 6, the sliding tube 6 passes through the inside of the spring 1, the lower end of the sliding tube 6 acts on the lower connecting piece 7, and the upper end of the sliding tube 6 acts on the The lower end of the through hole 21 of the valve body.

In order to ensure that the valve body 2 is less affected by mud pressure changes when the bypass valve is in normal use, further, an elastic snap ring groove is provided at the upper end of the through hole 55 of the casing, and an elastic snap ring 3 is arranged therein. The upward movement of the valve body 2 is restricted.

In order to effectively seal the passage between the casing through hole 55 and the bypass passage 51 and increase the service life of the bypass valve, further, the casing through hole 55 is provided with sealing grooves 52 on both sides of the bypass passage 51, so that A sealing member is provided in the sealing groove 52 .

In order to improve the versatility of the utility model, further, the upper and lower connection holes 53, 54 of the housing 5 are provided with TBG oil pipe threads or pipe threads.

The reverse circulation process of the utility model is realized in this way. When the plugging construction operation is over, in order not to carry out drilling and drilling operations, reverse circulation can be established to discharge the steel balls. For example, a The auxiliary pipeline is connected to the vibrating screen, and the steel balls are directly discharged to the vibrating screen by turning on the mud circulation of the pump, and then normal drilling operations can be performed.

According to the leak plugging bypass valve of the present invention, it has the following advantages: simple structure, convenient use, low failure rate, high cost performance, can be used for many times, and does not need to be drilled and tripped after each use, saving the time of stopping the drill, Can greatly reduce the risk and difficulty of accident handling. The plugging and bypass valve capable of reverse circulation of the utility model can realize the task of normally feeding and squeezing high-concentration large-particle materials and long-fiber plugging materials into the leakage layer, and can improve the pertinence of plugging. The efficiency of plugging materials and the pertinence of plugging are improved. If the lost zone is clear and the lost section is small, high-concentration slug plugging can be the first choice for sudden large lost circulation, which has a good promotion value.

Claims (7)

1. can a reverse circulating leak stopping bypass valve, comprise housing, steel ball, valve body, it is characterized in that, described valve body is hollow structure, and center is valve hole; Described housing is hollow structure, and center is housing through-hole, and described housing through-hole two ends are connected with upper and lower connecting hole respectively, and the sidewall of described housing is provided with and multiplely makes housing through-hole and the by-pass be connected outside housing; The lower connecting hole of described housing is connected with lower connector, described valve body is inserted in the epimere of described housing through-hole, spring is provided with between the lower end of described valve body and described lower connector, described valve hole upper end and steel ball effect, the diameter of described valve hole upper end is less than the diameter of described steel ball, the difference being greater than the pressure being applied to steel ball bottom when the pressure being applied to steel ball top reaches certain threshold value, and steel ball moves downward, and the upper end of housing through-hole is connected with the by-pass on housing.

2. the one as shown in claim 1 can reverse circulating leak stopping bypass valve, it is characterized in that, in described housing through-hole, the upper end of lower connector is provided with slide cartridge, described slide cartridge is through described spring, the lower end of described slide cartridge is applied on described lower connector, and the upper end of described slide cartridge is applied to the lower end of described valve hole.

3. one as claimed in claim 1 or 2 can reverse circulating leak stopping bypass valve, and it is characterized in that, the upper end of described housing through-hole is also provided with elastic card annular groove, is wherein provided with snap ring, limits the motion upwards of described valve body.

4. one as claimed in claim 1 or 2 can reverse circulating leak stopping bypass valve, and it is characterized in that, the both sides described housing through-hole being positioned at described by-pass are provided with seal groove, are provided with seal in described seal groove.

5. one as claimed in claim 3 can reverse circulating leak stopping bypass valve, and it is characterized in that, the both sides described housing through-hole being positioned at described by-pass are provided with seal groove, are provided with seal in described seal groove.

6. one as claimed in claim 1 or 2 can reverse circulating leak stopping bypass valve, and it is characterized in that, the connecting hole up and down of described housing is provided with TBG tubing round thread or gas thread.

7. one as claimed in claim 3 can reverse circulating leak stopping bypass valve, and it is characterized in that, the connecting hole up and down of described housing is provided with TBG tubing round thread or gas thread.