While-drilling annulus pressure measuring instrument with anti-overflow function

Abstract

The utility model discloses a while-drilling annulus pressure measuring instrument with an anti-overflow function, which is characterized by comprising a drill collar body, a while-drilling pressure detection probe arranged in an inner cavity of the drill collar body through a pressure guide sleeve, an anti-overflow plug arranged on the drill collar body, and a pressure sensor arranged on the drill collar body, the inner side of the anti-overflow plug is connected with a flow guide hole in the pressure guide sleeve, and the outer side of the anti-overflow plug is connected with a drill collar outer annular hollow area. The anti-overflow plug comprises an anti-overflow plug body, and a communicating cavity is formed in the anti-overflow plug body. The conducting cavity comprises a wide cavity and a narrow cavity which are connected with each other; and a movable ball body is arranged in the wide cavity. The while-drilling annulus pressure measuring instrument with the anti-overflow function can achieve the purpose of preventing slurry in an inner hole of a drill column from leaking towards a specific direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to petroleum measurement and control tool field, concretely relates to a drilling annular pressure measuring instrument with anti overflow function. BACKGROUND

[0002] With the development of petroleum to the deep earth, the bottom condition of petroleum drilling is more and more complex, in order to be able to real-time monitoring bottom pressure, drilling pressure detection probe pipe application is more and more common. When detecting the external pressure of the bottom drill string system, the drilling pressure detection probe pipe needs to cooperate with the pressure guide sleeve and the drill collar body.

[0003] Figure 1 1A, 1B and 1C are three states of the drilling pressure detection probe pipe cooperating with the pressure guide sleeve. Among them, when the installation conforms to 1A, the instrument can work normally.

[0004] Through Figure 1 Combined with Figure 2 When 1A in the local enlarged view, the working principle of the drilling annular pressure measuring instrument is as follows: the high-pressure mud flows from the drill string inner hole to the pressure guide sleeve 13 in the arrow direction, the high-pressure mud flows to the bottom through the flow channel between the pressure guide sleeve 13 and the drill string inner hole, and then circulates upward to the drill collar outer annular space of the drill string. The high-pressure mud in the drill collar outer annular space of the drill string flows to the straight-through screw plug 10 through the pressure guide sleeve 13 inner guide hole in the arrow direction to the pressure detection area (i.e. the area between the sealing ring group I and the sealing ring group II) of the drilling pressure detection probe pipe. At this time, the pressure sensor 17 installed in the pressure detection area detects the pressure value of the mud to obtain pressure information.

[0005] If the drilling pressure detection probe pipe and the pressure guide sleeve are incorrectly matched to cause the installation state of 1B and 1C, or although the installation conforms to 1A, but the sealing ring group I or the sealing ring group II fails due to some reason, the high-pressure mud in the drill string will directly leak to the drilling tool annular space through the straight-through screw plug (see Figure 3 1B in the local enlarged view and Figure 4 1C in the local enlarged view of, the mud flow direction refers to the arrow direction). At this time, the drilling pressure detection probe pipe cannot work normally, and the high-pressure and high-speed mud directly sprayed to the well wall will have a significant impact on the safety of drilling. In addition, the length of the downhole drill string system is more than one kilometer, and the actual assembly error and the theoretical calculation error will affect the cooperation of the drilling pressure detection probe pipe and the pressure guide sleeve, so there is a risk of 1B or 1C state in actual use, which causes the high-pressure mud to directly leak through the straight-through screw plug. UTILITY MODEL CONTENTS

[0006] In order to overcome the above-mentioned defects of the prior art, the purpose of the utility model is to provide a drilling annular pressure measuring instrument with anti overflow function.

[0007] The utility model discloses a prevent overflow screw plug, and the feature is that high pressure slurry can only pass according to one-way shown in the figure. Figure 5 The prevent overflow screw plug is installed to the sidewall of the drill collar according to a specific direction, so that the purpose of preventing slurry in the bore of the drill string from leaking to a specific direction is achieved.

[0008] A drilling annular pressure measuring instrument with a prevent overflow function, comprising:

[0009] A drill collar body, a drilling pressure detection probe pipe is arranged in the inner cavity of the drill collar body through a pressure guide sleeve, a prevent overflow screw plug is arranged on the drill collar body, the inner side of the prevent overflow screw plug is connected with the flow guide hole on the pressure guide sleeve, and the outer side of the prevent overflow screw plug is connected with the drill collar outer annular space.

[0010] The prevent overflow screw plug comprises a prevent overflow screw plug body, and a through cavity is arranged in the prevent overflow screw plug body.

[0011] The through cavity is a wide cavity and a narrow cavity connected with each other.

[0012] An active ball is arranged in the wide cavity, when high pressure fluid is passed into the wide cavity through the prevent overflow screw plug when the inner side of the prevent overflow screw plug is connected with the flow guide hole on the pressure guide sleeve, the active ball is pushed to move towards the interface between the wide cavity and the narrow cavity, so that the high pressure fluid is blocked by the prevent overflow screw plug and cannot flow into the drill collar outer annular space.

[0013] When the high pressure fluid flows into the prevent overflow screw plug from the drill collar outer annular space, the active ball is pushed to move towards the direction of the prevent overflow screw plug, so that the interface between the wide cavity and the narrow cavity is unobstructed, the high pressure fluid flows to the sensor part of the drilling pressure detection probe pipe through the flow guide hole on the pressure guide sleeve, and the drilling pressure measurement function is realized.

[0014] In one preferred embodiment of the utility model, the wide cavity is a cylindrical cavity.

[0015] In one preferred embodiment of the utility model, the narrow cavity is a conical cavity, and the narrow end of the conical cavity is directed towards the direction of the drill collar outer annular space.

[0016] In one preferred embodiment of the utility model, the diameter of the prevent overflow screw plug body towards the entrance of the drill collar outer annular space is greater than the diameter of the wide cavity.

[0017] In one preferred embodiment of the utility model, the active ball is a steel ball, and the diameter of the steel ball is greater than the diameter of the narrow end of the conical cavity.

[0018] The utility model has the advantages of:

[0019] The drilling annular pressure measuring instrument with the anti-overflow function can prevent the mud in the inner hole of the drill string from leaking to a specific direction. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A three-state schematic diagram of the prior art.

[0021] Figure 2 A 1A state enlarged view of the prior art.

[0022] Figure 3 A 1B state enlarged view of the prior art.

[0023] Figure 4 A 1C state enlarged view of the prior art.

[0024] Figure 5 A schematic diagram of the anti-overflow screw plug of the utility model.

[0025] Figure 6 A schematic diagram of the plugging state of the utility model.

[0026] Figure 7 A schematic diagram of the on-state of the utility model. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clear and explicit, the utility model is further described in detail below through the drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the scope of the utility model. In addition, in the following structure, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0028] In the description of the utility model, it should be pointed out that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0029] In order to improve the risk of 1B or 1C state existing in actual use, resulting in the problem of high-pressure mud directly leaking through the straight-through screw plug, the utility model designs the anti-overflow screw plug 14 as shown in Figure 5

[0030] ​The utility model provides an anti -overflow function's while drilling annular pressure measuring instrument, including the collar body 11, is provided with the while drilling pressure detection probe tube 13 through the pressure guide bushing 12 in the inner chamber of the collar body 11.

[0031] The utility model discloses an anti -overflow function's while drilling annular pressure measuring instrument, Figure 5 And Figure 6 Anti -overflow screw plug 14 is arranged on the collar body 11, the inner side of anti -overflow screw plug 14 is connected with the flow guide hole 1311 on the pressure guide bushing 13, and the outer side of anti -overflow screw plug 14 is connected with the collar outer annular space 100.

[0032] Anti -overflow screw plug 14 includes anti -overflow screw plug body 141, and the anti -overflow screw plug body 141 is provided with the through cavity 142, and the through cavity 142 is connected with wide cavity 1421 and narrow cavity 1422.

[0033] Wide cavity 1421 is a cylindrical cavity, and narrow cavity 1422 is a tapered cavity, and the narrow end of the tapered cavity faces the direction of the collar outer annular space 100.

[0034] The diameter of the inlet of the anti -overflow screw plug body 14 in the collar outer annular space 100 is greater than the diameter of the wide cavity 1421, so that it is convenient to guide from outside to inside.

[0035] The movable ball 15 is arranged in the wide cavity 1421, when the high-pressure fluid in the connected place of the inner side of anti -overflow screw plug 14 and the flow guide hole 1311 on the pressure guide bushing 13 passes through the hole screw plug 16 and enters the wide cavity 1421, the high-pressure fluid pushes the movable ball 15 to move towards the interface of the wide cavity 1421 and the narrow cavity 1422, the movable ball 15 is a steel ball, and the diameter of the steel ball is greater than the diameter of the narrow end of the tapered cavity narrow cavity 1422, so that the high-pressure fluid is cut off by the anti -overflow screw plug 14 and cannot flow into the collar outer annular space 100.

[0036] The utility model discloses an anti -overflow function's while drilling annular pressure measuring instrument, Figure 7 When the high-pressure fluid flows into the anti -overflow screw plug 14 from the collar outer annular space 100 in the direction of the arrow, the high-pressure fluid pushes the movable ball 15 to move towards the hole screw plug 16, so that the interface of the wide cavity 1421 and the narrow cavity 1422 is smooth, the high-pressure fluid passes through the flow guide hole 1311 of the pressure guide bushing 13 to the while drilling pressure detection probe sensor 17 part through the anti -overflow screw plug 14, realizes the while drilling pressure measuring function.

[0037] The basic principle, main features and advantages of the utility model are shown and described above.

[0038] The person skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description are only for explaining the principle of the utility model, various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed, and the scope of protection of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A drilling while measuring instrument with anti-overflow function, characterized in that, The application relates to a drill collar body, a pressure detection probe pipe is arranged in the inner cavity of the drill collar body through a pressure guide sleeve, an anti-overflow screw plug is arranged on the drill collar body, the inner side of the anti-overflow screw plug is connected with a flow guide hole on the pressure guide sleeve, and the outer side of the anti-overflow screw plug is connected with a drill collar outer annular space. The anti-overflow screw plug comprises an anti-overflow screw plug body, and a guide cavity is arranged in the anti-overflow screw plug body. The guide cavity is connected with a wide cavity and a narrow cavity. An active ball is arranged in the wide cavity. The wide cavity is a cylindrical cavity.

2. The drill collar annular pressure measurement instrument with anti-overflow function according to claim 1, characterized in that, The narrow cavity is a tapered cavity, and the narrow end of the tapered cavity is directed to the direction of the drill collar outer annular space.

3. The drill collar annular pressure measurement instrument with anti-overflow function according to claim 1, characterized in that, The diameter of the anti-overflow screw plug body at the entrance of the drill collar outer annular space is greater than the diameter of the wide cavity.

4. The drill collar annular pressure measurement instrument with anti-overflow function according to claim 1, characterized in that, The active ball is a steel ball, and the diameter of the steel ball is greater than the diameter of the narrow end of the tapered cavity.

5. The anti-overflow drill collar pressure gauge of claim 3, wherein, ​

Images