Filterable drill rod for well drilling construction

Abstract

The utility model relates to the technical field of oil exploration, in particular to a filterable drill rod for well drilling construction. Comprising a drill rod body and a filtering assembly, the filtering assembly is arranged in the drill rod body, and an annular cavity is formed between the filtering assembly and the drill rod body; the filtering assembly comprises a first filtering pipe and a second filtering pipe, the first filtering pipe is arranged above the second filtering pipe, and the first filtering pipe is detachably connected with the second filtering pipe; a plurality of first filter hole groups are formed in the side wall of the first filter pipe, a plurality of second filter hole groups are formed in the side wall of the second filter pipe, and filter flow holes are formed in the upper end of the second filter pipe in a penetrating manner; the interior of the first filter pipe is communicated with the annular cavity through the first filter hole group, the interior of the second filter pipe is communicated with the annular cavity through the second filter hole group, and the interior of the first filter pipe is communicated with the interior of the second filter pipe through the filter flow holes; normal work of the MWD instrument is guaranteed, and drilling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum exploration, in particular to a filterable drill rod for drilling construction. Background Art

[0002] During the oil and gas well drilling and development process, vertical, directional, or horizontal well drilling operations are required in the oil and gas development layer. During the drilling process, an MWD instrument must be installed in the drill string. The MWD instrument is mainly used for measurement while drilling, that is, measuring certain information near the drill bit without interrupting normal drilling operations, and transmitting this information to the surface in real time. Therefore, the stability of the MWD instrument signal is an important factor in ensuring the wellbore quality and drilling efficiency.

[0003] Currently, the main reasons for instrument failure are the shedding of the protective coating on the inner wall of the drill pipe and the presence of foreign matter in the drilling fluid, which flows to the MWD instrument with the circulation of the drilling fluid. Since the pulse flow channel of the MWD instrument is too small, the protective coating and foreign matter cannot pass through, and will accumulate and clog the pulse flow channel of the MWD instrument, causing the MWD instrument to malfunction. Severe blockage will prevent the drilling fluid from circulating, causing drilling construction to stop, and thus affecting drilling efficiency.

[0004] Therefore, there is an urgent need to provide a filterable drill pipe for drilling construction, which can ensure the normal operation of the MWD instrument and improve the drilling efficiency compared with the existing technology. Utility Model Content

[0005] The utility model solves the technical problems existing in the prior art and provides a filterable drill rod for well drilling construction.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] A filterable drill pipe for drilling construction, comprising a drill pipe body and a filter assembly, wherein the filter assembly is arranged inside the drill pipe body, and an annulus cavity is provided between the filter assembly and the drill pipe body; the filter assembly comprises a first filter tube and a second filter tube, the first filter tube is arranged above the second filter tube, and the first filter tube and the second filter tube are detachably connected; a plurality of first filter hole groups are provided on the side wall of the first filter tube, a plurality of second filter hole groups are provided on the side wall of the second filter tube, and a filter hole is penetrated by the upper end of the second filter tube; the interior of the first filter tube is communicated with the annulus cavity through the first filter hole group, the interior of the second filter tube is communicated with the annulus cavity through the second filter hole group, and the interior of the first filter tube is communicated with the interior of the second filter tube through the filter hole.

[0008] Furthermore, the first filter tube and the second filter tube are threadedly connected.

[0009] Furthermore, each of the first filter hole groups includes a plurality of first filter holes.

[0010] Furthermore, each of the first filter holes is arranged obliquely downward from the inside of the first filter tube to the outside of the first filter tube.

[0011] Furthermore, each of the second filter hole groups includes a plurality of second filter holes.

[0012] Furthermore, each of the second filter holes is arranged obliquely upward from the inside of the second filter tube to the outside of the second filter tube.

[0013] Furthermore, the pore size of the first filter pore is larger than the pore size of the second filter pore.

[0014] Furthermore, the pore size of the second filter pore is greater than or equal to the pore size of the flow filter pore.

[0015] Furthermore, the length of the first filter tube along the axial direction is greater than the length of the second filter tube along the axial direction.

[0016] Furthermore, a plurality of straightening blocks are provided on the outer wall of the first filter tube.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] During filtration, the utility model filters the drilling fluid firstly into the first filter tube, a portion of the drilling fluid enters the annulus cavity after being filtered through the first filter hole, and then enters the second filter tube after being filtered through the second filter hole, and the other portion of the drilling fluid directly enters the second filter tube after being filtered through the filter flow hole. The drilling fluid in the second filter tube passes through the MWD instrument and finally enters the drilling tool connected thereto, which can realize multi-stage filtration, and prevent the protective coating fallen off the inner wall of the drill pipe and foreign matter in the drilling fluid from accumulating and clogging at the pulse flow channel of the MWD instrument, causing the MWD instrument to malfunction, and preventing the drilling fluid from being unable to circulate when the blockage is serious, thereby affecting the drilling construction progress. At the same time, the utility model has a simple structure and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the overall structure of the utility model.

[0020] Figure 2 It is a cross-sectional view of the utility model showing the connection relationship between the first filter tube and the second filter tube.

[0021] Figure 3 It is a cross-sectional view showing the structure of the first filter tube of the present invention.

[0022] Figure 4 It is a cross-sectional view showing the structure of the second filter tube of the present invention.

[0023] Description of reference numerals:

[0024] 1. Drill pipe body; 2. Annulus cavity; 3. First filter tube; 4. Second filter tube; 5. First filter hole; 6. Second filter hole; 7. Filter hole; 8. Straightening block. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the embodiments described are not all embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0026] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the utility model provides a filterable drill pipe for drilling construction, including a drill pipe body 1 and a filter assembly. The filter assembly is arranged inside the drill pipe body 1, and the filter assembly and the drill pipe body 1 are spaced apart. The space between the filter assembly and the drill pipe body 1 is set as an annulus cavity 2.

[0027] The filter assembly includes a first filter tube 3 and a second filter tube 4. The first filter tube 3 is arranged above the second filter tube 4. The first filter tube 3 is configured as a hollow structure with openings at both the upper and lower ends, and the second filter tube 4 is configured as a hollow structure with an opening at the lower end. The first filter tube 3 and the second filter tube 4 are detachably connected. The first filter tube 3 and the second filter tube 4 are preferably connected in a threaded manner. The lower end of the inner wall of the first filter tube 3 is provided with an internal thread, and the upper end of the outer wall of the second filter tube 4 is provided with an external thread. The upper end portion of the second filter tube 4 extends into the interior of the first filter tube 3 and is threadedly fixed. The first filter tube 3 and the second filter tube 4 are detachably connected, making it convenient to separate the first filter tube 3 and the second filter tube 4 for thorough cleaning. The axial length of the first filter tube 3 is greater than the axial length of the second filter tube 4. The outer diameter of the first filter tube 3 is the same as the outer diameter of the portion of the second filter tube 4 that does not extend into the first filter tube 3. The wall thickness of the first filter tube 3 and the second filter tube 4 are the same.

[0028] The outer wall of the first filter tube 3 is provided with a plurality of first filter hole groups, which are arranged at intervals along the circumference of the first filter tube 3. Each first filter hole group includes a plurality of first filter holes 5. The plurality of first filter holes 5 in each first filter hole group are arranged at intervals along the axial direction of the first filter tube 3. All the first filter holes 5 are arranged through the side wall of the first filter tube 3. All the first filter holes 5 are arranged obliquely downward from the inside of the first filter tube 3 to the outside of the first filter tube 3. The downward inclination of the first filter holes 5 can guide the flow direction of the liquid, increase the contact area between the liquid flow and the inner wall of the drill pipe body 1, reduce the impact force of the liquid flow on the inner wall of the drill pipe body 1, and extend the service life of the drill pipe.

[0029] The outer wall of the second filter tube 4 is provided with a plurality of second filter hole groups, which are arranged at intervals along the circumference of the second filter tube 4. Each second filter hole group includes a plurality of second filter holes 6. The plurality of second filter holes 6 in each second filter hole group are arranged at intervals along the axial direction of the second filter tube 4. All the second filter holes 6 are arranged through the side wall of the second filter tube 4. All the second filter holes 6 are arranged obliquely upward from the inside of the second filter tube 4 to the outside of the second filter tube 4. The second filter holes 6 are arranged obliquely upward to guide the flow direction of the liquid, thereby reducing the impact of the liquid flow on the tube wall of the second filter tube 4 and hydraulic cutting.

[0030] A plurality of filter holes 7 are provided along the circumference of the upper end of the second filter tube 4. Each filter hole 7 extends along the axial direction of the second filter tube 4. One end of the filter hole 7 is connected to the interior of the first filter tube 3, and the other end of the filter hole 7 is connected to the interior of the second filter tube 4. The filter holes 7 filter the liquid flow from the first filter tube 3 into the second filter tube 4, which helps to reduce the filtration pressure of the first filter hole 5 and the second filter hole 6.

[0031] The first filter hole 5, the second filter hole 6, and the filter hole 7 are all manufactured by laser plasma processing; the aperture of the first filter hole 5 is larger than the aperture of the second filter hole 6, and the aperture of the second filter hole 6 is larger than or equal to the aperture of the filter hole 7, which can play a role of step-by-step filtration, thereby improving the filtering effect.

[0032] A plurality of straightening blocks 8 are provided on the outer wall of the first filter tube 3 . Each straightening block 8 is bonded and fixed to the outer wall of the first filter tube 3 by a high-temperature vulcanization process. By providing the straightening blocks 8 , shaking of the filter assembly can be avoided.

[0033] The working principle of a filterable drill pipe for drilling construction provided by the utility model is as follows: the filterable drill pipe provided by the utility model is connected to the drilling pipe string, and the drilling fluid enters the filterable drill pipe provided by the utility model through the upper ordinary drill pipe, and the solid falling objects are intercepted in the first filter tube 3 by the first filter hole 5 and the filter hole 7. A part of the drilling fluid after filtering enters the annulus cavity 2, continues to flow downward in the annulus cavity 2, and enters the second filter tube 4 after being filtered again through the second filter hole 6. The other part of the drilling fluid directly enters the second filter tube 4 after being filtered through the filter hole 7. The drilling fluid in the second filter tube 4 passes through the MWD instrument and finally enters the drilling tool connected thereto, thereby realizing the normal circulation of the drilling fluid and successfully completing the drilling construction.

[0034] After the construction is completed, the filterable drill pipe provided by the utility model is removed and reverse flushing is performed to clean the protective coating and other foreign matter in the first filter tube 3 and the second filter tube 4. The filter assembly can also be taken out from the inside of the drill pipe body 1, and the first filter tube 3 and the second filter tube 4 are separated and cleaned separately, which has a more thorough cleaning effect.

[0035] During filtration, the present invention firstly enters the first filter tube 3, a portion of the drilling fluid enters the annulus cavity after being filtered through the first filter hole 5, and then enters the second filter tube 4 after being filtered through the second filter hole 6. Another portion of the drilling fluid enters the second filter tube 4 directly after being filtered through the filter flow hole 7. The drilling fluid in the second filter tube 4 passes through the MWD instrument and finally enters the drilling tool connected thereto, thereby realizing multi-stage filtration, preventing the protective coating fallen off the inner wall of the drill pipe and foreign matter in the drilling fluid from accumulating and clogging at the pulse flow channel of the MWD instrument, causing the MWD instrument to malfunction, and preventing the drilling fluid from being unable to circulate when the blockage is serious, thereby affecting the drilling construction progress. At the same time, the present invention has a simple structure and is easy to maintain.

[0036] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Simple modifications or equivalent replacements of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. A filterable drill pipe for drilling construction, characterized in that: The invention comprises a drill pipe body and a filter assembly, wherein the filter assembly is arranged inside the drill pipe body, and an annular cavity is provided between the filter assembly and the drill pipe body; the filter assembly comprises a first filter tube and a second filter tube, the first filter tube is arranged above the second filter tube, and the first filter tube and the second filter tube are detachably connected; a plurality of first filter hole groups are provided on the side wall of the first filter tube, a plurality of second filter hole groups are provided on the side wall of the second filter tube, and a filter hole is penetrated at the upper end of the second filter tube; the interior of the first filter tube is communicated with the annular cavity through the first filter hole group, the interior of the second filter tube is communicated with the annular cavity through the second filter hole group, and the interior of the first filter tube is communicated with the interior of the second filter tube through the filter hole.

2. A filterable drill pipe for drilling construction according to claim 1, characterized in that: The first filter tube and the second filter tube are threadedly connected.

3. A filterable drill pipe for drilling construction according to claim 1, characterized in that: Each of the first filter hole groups includes a plurality of first filter holes.

4. A filterable drill pipe for drilling construction according to claim 3, characterized in that: Each of the first filter holes is arranged obliquely downward from the inside of the first filter tube to the outside of the first filter tube.

5. The filterable drill pipe for drilling construction according to claim 3, characterized in that: Each of the second filter pore groups includes a plurality of second filter pores.

6. A filterable drill pipe for drilling construction according to claim 5, characterized in that: Each of the second filter holes is arranged obliquely upward from the inside of the second filter tube to the outside of the second filter tube.

7. The filterable drill pipe for drilling construction according to claim 5, characterized in that: The pore size of the first filter pore is larger than the pore size of the second filter pore.

8. The filterable drill pipe for drilling construction according to claim 7, characterized in that: The pore size of the second filter pore is greater than or equal to the pore size of the flow filter pore.

9. The filterable drill pipe for drilling construction according to claim 1, characterized in that: The length of the first filter tube along the axial direction is greater than the length of the second filter tube along the axial direction.

10. The filterable drill pipe for drilling construction according to claim 1, characterized in that: A plurality of straightening blocks are provided on the outer wall of the first filter tube.

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