CN110485964B - Adjustable annular suction drainage assisting mechanism for sand drainage pipeline of drilling well - Google Patents
Adjustable annular suction drainage assisting mechanism for sand drainage pipeline of drilling well Download PDFInfo
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- CN110485964B CN110485964B CN201910809796.8A CN201910809796A CN110485964B CN 110485964 B CN110485964 B CN 110485964B CN 201910809796 A CN201910809796 A CN 201910809796A CN 110485964 B CN110485964 B CN 110485964B
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- 239000004576 sand Substances 0.000 title claims abstract description 53
- 230000007246 mechanism Effects 0.000 title claims abstract description 49
- 238000005553 drilling Methods 0.000 title claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 85
- 239000007924 injection Substances 0.000 claims abstract description 85
- 238000007789 sealing Methods 0.000 claims description 23
- 238000005086 pumping Methods 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 95
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 38
- 239000003345 natural gas Substances 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 6
- 230000002441 reversible effect Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/07—Arrangements for treating drilling fluids outside the borehole for treating dust-laden gaseous fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Jet Pumps And Other Pumps (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides an adjustable drilling sand discharge pipeline annular suction drainage assisting mechanism, which comprises: the device comprises a basic flange, a gas injection shell, a central core male pipe and an upper core pipe which are coaxial, wherein the left side of the basic flange and the right side of the upper core pipe are respectively connected with an upper hard pipeline and a lower hard pipeline; the inner circumference of the right side part of the gas injection shell is provided with a first thread; the core male pipe includes a left side portion provided with a second thread engaged with the first thread and an inner conical surface formed on an outer wall of the left side thereof, the inner conical surface being engageable with the outer conical surface to form an adjustable injection passage, so that the injection passage is closed or opened by the left-right movement of the core male pipe, respectively. The invention can solve the safety problem when the gas drilling is carried out under the condition that a small amount of natural gas is discharged from the stratum, obviously improves the safety of the gas drilling operation of the gas bearing stratum section, and can also be applied to the conventional positive circulation or reverse circulation gas drilling, thereby effectively reducing the local loss at the right angle turning position and ensuring that the surface sand discharge process is smoother.
Description
Technical Field
The invention relates to the technical field of oil and gas drilling engineering, in particular to sand discharging manifold equipment for drilling, which can be used for implementing nitrogen suction safety operation under the condition that a small amount of natural gas is discharged from a stratum, can also be used for reducing sand discharging resistance of a surface sand discharging manifold during forward circulation or reverse circulation drilling, and improves sand discharging effect.
Background
In general, the gas drilling technology has the advantages of accelerating, preventing leakage, protecting reservoirs and the like, and is widely applied to oil and gas blocks such as Chongqing, xinjiang, qinghai and the like in recent years, and the gas drilling technology is simultaneously accelerated by more than 3 times compared with the conventional drilling technology. Gas drilling is adopted to accelerate the gas-bearing stratum section with poor drilling difficulty more and more commonly; however, once the formation is drilled out a small amount of natural gas (.ltoreq.10000 m) 3 And/d), the circulating medium is converted into inert gas nitrogen to avoid underground explosion accidents, but often due to the lack of an annular blowout preventer, large size of drilling tools and incapability of passing through a rotary control head assembly and the like, when in open well operations such as tripping and rubber core replacement,natural gas can overflow the wellhead, and a great potential safety hazard is brought.
At present, effective measures for solving the problem that natural gas overflows a wellhead when the open well operation such as 'tripping and rubber core replacement' is carried out under the condition that a small amount of natural gas is discharged from a stratum are not solved, and the natural gas possibly overflowed is blown away by opening an explosion-proof exhaust fan on the upper side and the lower side of a drill floor so as to prevent the natural gas from gathering. The processing method has a plurality of defects:
(1) the natural gas can not be prevented from overflowing from the wellhead fundamentally by passive control measures, but can be blown off by an exhaust fan only;
(2) although the explosion-proof exhaust fan can blow off overflowed natural gas to avoid aggregation, drill floor and wellhead operators still need to directly face the overflowed natural gas, so that great potential safety hazards exist, and particularly knocking operation is performed;
(3) because the site operation safety cannot be ensured, when a small amount of natural gas is produced when the drill meets the stratum (less than or equal to 10000 m) 3 And/d), is often forced to terminate the gas drilling operation in advance, which is disadvantageous in terms of the acceleration advantage.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art.
For example, one of the objectives of the present invention is to address the safety issues of gas drilling open hole operations with small amounts of natural gas produced from the formation. The invention also aims to solve the problems that when the conventional positive circulation or reverse circulation gas drilling is performed (particularly the reverse circulation drilling is performed), local loss is large due to the fact that the surface sand discharge channel has a plurality of right-angle turning places, and the sand discharge effect is affected.
In order to achieve at least one of the above objects, the present invention provides an adjustable drilling sand discharge pipeline annular suction drainage assisting mechanism, comprising: the sand discharge device comprises a base flange, a gas injection shell, a central core male pipe and an upper core pipe, wherein the base flange is coaxially arranged, and is provided with a left side part which can be connected with an upstream hard pipeline of a sand discharge pipeline, a right side part with an outer conical surface and an outer protruding part protruding outwards in the radial direction; the gas injection shell comprises a left side part with a first inner diameter, a right side part with a second inner diameter and one or more gas injection joints, wherein the first inner diameter is larger than the second inner diameter, the left side part of the gas injection shell is fixedly connected with the outer protruding part of the foundation flange through an anti-rotation member, a first thread is arranged on the inner circumference of the right side part of the gas injection shell, and the gas injection joints can communicate a space corresponding to the first inner diameter with outside gas; the middle core male pipe comprises a right side part which is inserted into the left side of the upper core pipe and is tightly contacted with the inner circumferential wall of the upper core pipe through a first sealing piece, a left side part with a second thread, and an inner conical surface which is formed on the inner circumference of the left side part of the middle core male pipe, wherein the second thread is arranged on the outer wall of the middle core male pipe and can be matched with the first thread so as to realize left or right movement of the middle core male pipe relative to the gas injection shell corresponding to the rotation of the middle core male pipe around a shaft, and the inner conical surface can be matched with the outer conical surface of the right side part of the base flange so as to form an adjustable injection channel communicated with the gas injection joint, so that the closing or opening of the injection channel is correspondingly realized corresponding to the left or right movement of the middle core male pipe; the upper core tube has a right side portion connectable to a hard line downstream of the sand discharge line.
In one exemplary embodiment of the present invention, the suction assist mechanism may further include an upper core tube flange capable of connecting the right side portion of the upper core tube with a downstream hard line of the sand discharge line.
In an exemplary embodiment of the present invention, the pumping aid discharging mechanism may further include an upper core pipe clamping member capable of clamping a right side portion of the central core male pipe with the upper core pipe and restricting axial displacement between the upper core pipe and the central core male pipe.
In an exemplary embodiment of the present invention, the core male pipe may further include a convex circumferential portion provided on the left side portion of the core male pipe and protruding radially outward at the left side of the second thread to improve sealability of the first thread engaged with the second thread. In addition, the suction assist mechanism may further include a second seal disposed between the right side portion of the gas injection housing and the outer convex circumferential portion of the core male tube.
In one exemplary embodiment of the present invention, the first sealing member may include a sealing ring and a sealing groove that cooperate with each other, and the second sealing member may include a sealing ring and a sealing groove that cooperate with each other.
In one exemplary embodiment of the present invention, the left side portion of the gas injection case may be fastened to the outer protrusion portion of the base flange by a detachable anti-rotation member.
In an exemplary embodiment of the present invention, the core male pipe may further include a swivel fitting portion capable of enabling the core male pipe to rotate around the shaft under an external force. In addition, the swivel fitting portion may be provided on an outer wall of the central core male pipe between the left side of the upper core pipe and the right side portion of the gas injection housing.
Compared with the prior art, the invention has the beneficial effects that one or more of the following contents are included:
(1) The safety problem of the gas drilling open operation under the condition that a small amount of natural gas is discharged from the stratum can be solved, the safety of the gas drilling open operation of the gas bearing stratum section is obviously improved, the gas drilling footage is prolonged, the advantage of the gas drilling accelerating is brought into play, and the blank of the safety process measure of the gas drilling open operation when a small amount of natural gas is discharged from the stratum is filled;
(2) The method can be applied to conventional positive circulation or reverse circulation gas drilling (particularly reverse circulation drilling), so that the local loss at the right-angle turning position is effectively reduced, and the surface sand discharge process is smoother.
Drawings
FIG. 1a illustrates a schematic cross-sectional view of an exemplary embodiment of an adjustable well sand removal line annular pumping drainage assist mechanism of the present invention in an axial direction;
FIG. 1b shows an enlarged partial schematic view of I in FIG. 1;
FIG. 2 illustrates a schematic exterior view of an exemplary embodiment of an adjustable drilling sand removal line annular pumping aid mechanism of the present invention;
FIG. 3a illustrates a schematic cross-sectional view of an exemplary embodiment of an adjustable well sand removal line annular pumping drainage assist mechanism of the present invention in a closed state;
fig. 3b shows an enlarged partial schematic view of N in fig. 1;
fig. 4 illustrates an exterior appearance of an exemplary embodiment of the adjustable well sand removal line annular pumping aid mechanism of the present invention.
Reference numerals illustrate:
a ' 1-base flange, A ' 2-gas injection joint, A ' 3-upper core pipe, A ' 4-upper core pipe flange, A ' 5-upper core pipe snap ring, A ' 6-middle core pipe (male), A ' 7-gas injection shell, A ' 8-inner hexagon screw, and A ' 9-upper core pipe snap ring fastening bolt.
Detailed Description
Hereinafter, the adjustable well sand removal line annular pumping drainage aid mechanism of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
In one exemplary embodiment of the invention, an adjustable well sand removal line annular pumping drainage aid mechanism comprises: the device comprises a base flange, a gas injection shell, a central core male pipe and an upper core pipe which are coaxially arranged.
The left side of the base flange can be connected with an upstream hard line of the sand discharge line. The left side of the base flange may be flanged or clamped to the upstream hard line. The outer wall on the right side of the base flange is provided with an outer conical surface. For example, the outer wall of the right end portion of the pipe body of the foundation flange is formed as a truncated cone curved surface having a predetermined width in the axial direction. The base flange also has an outer projection projecting radially outwardly. For example, the outer projection of the base flange may be flange-like.
The gas injection housing may include a left side having a first inner diameter, a right side having a second inner diameter, and one or more gas injection connectors. Wherein the first inner diameter is greater than the second inner diameter, e.g., the first inner diameter may be about 1/4 to 1/5 greater than the second inner diameter. The left side of the gas injection shell is fixedly connected with the outer protruding part of the foundation flange through an anti-rotation component. The anti-rotation member is capable of limiting relative rotation between the gas injection housing and the base flange. For example, the anti-rotation member may be an inner polygonal screw, however, the present invention is not limited thereto. In addition, the anti-rotation member herein may also have a structure that facilitates manual disassembly, thereby facilitating disassembly operations when different gauges of spray flanges need to be replaced. The right inner circumferential wall of the gas injection casing is provided with a first thread. For example, the inner circumferential wall of the right-side end portion of the gas injection casing may be provided with a first screw having a predetermined width in the axial direction. The gas injection joint can communicate the space corresponding to the first inner diameter with outside gas. For example, the gas injection joint may communicate with the injection passage through the inner space of the gas injection housing, or may communicate directly with the injection passage so as to inject the external gas into the main body line through the injection passage. The gas injection joint can be arranged on the gas injection shell in a threaded connection mode, and connection can be achieved through continuous casting. The external air may be provided by a high pressure air pump or a booster fan. For example, the gas injection fitting may be disposed through the left side of the gas injection housing.
The right side of the middle core male pipe may be inserted into the left side of the upper core pipe and closely contacted with the inner circumferential wall of the upper core pipe through the first sealing member. The first seal may be formed of a seal ring and a seal groove that cooperate with each other, however, the present invention is not limited thereto, and other members capable of achieving an effective sealing function may be used. The outer circumferential wall of the left side of the core male tube may be provided with a second thread capable of being engaged with the first thread of the gas injection casing. The first thread and the second thread can be tightly matched, so that the core male pipe can move leftwards or rightwards relative to the gas injection shell, namely move leftwards and rightwards along the axial direction through the rotation of the core male pipe around the shaft under the action of external force. The core male pipe further has an inner conical surface formed on an inner circumferential wall on the left side thereof. For example, the inner wall of the left end portion of the tube body of the core male tube is formed into a truncated cone curved surface having a predetermined width in the axial direction. The inner conical surface of the core male tube can cooperate with the outer conical surface of the base flange to form an adjustable injection passage. The injection passage is in communication with the gas injection fitting. For example, the injection channel may be in the form of an annular band of adjustable size. For example, as the core male tube rotates clockwise or counterclockwise about the axis under the action of an external force, it will move to the left or right under the cooperation of the first thread and the second thread, thereby effecting a corresponding adjustment of the size of the injection passage, even when the inner conical surface of the core male tube fully contacts the outer conical surface of the base flange, effecting a closing of the injection passage.
The upper core tube has a right side portion connectable to a hard line downstream of the sand discharge line. For example, the right side of the upper core tube may be flanged or clamped to the downstream hard wire.
In another exemplary embodiment of the present invention, the suction drainage assisting mechanism may further include an upper core tube flange on the basis of the structure of the above exemplary embodiment. The upper core pipe flange is convenient for connecting the right side of the upper core pipe with a downstream hard pipeline of the sand discharge pipeline. In addition, the suction assist mechanism may also include a gas compression device. The gas outlet of the gas compression device can be connected with a gas injection joint of the gas injection shell.
In another exemplary embodiment of the present invention, the suction drainage assisting mechanism may further include an upper core tube clamping piece on the basis of the structure of the above exemplary embodiment. Go up core pipe joint spare can be with the right side and the last core pipe chucking of well core male pipe to restrict the axial displacement between well core pipe and the well core male pipe, thereby can ensure the sealed effect of going up core pipe and well core male pipe more effectively, avoid leading to the well core male pipe to be insecure with the sealing of going up the core pipe because of the well core male pipe about removing. However, the present invention is not limited thereto, and for example, the sealing effect between the upper core tube and the middle core tube may be ensured by reasonably setting the structure of the first sealing member or the overlapping manner and overlapping dimension between the right side of the middle core tube and the left side of the upper core tube, thereby avoiding the sealing weakness between the middle core tube and the upper core tube caused by the left-right movement of the middle core tube.
In the suction drainage assisting mechanism according to another exemplary embodiment of the present invention, the central male pipe may further include a convex circumferential portion provided on a left side portion of the central male pipe and located on a left side of the second thread of the central male pipe, so as to further improve sealability of the first thread of the gas injection housing engaged with the second thread of the central male pipe. Here, the outer convex circumferential portion of the core male pipe may be a circular ring band protruding outward in the radial direction of the core male pipe, for example, may be flange-like. In addition, a second sealing member may be further provided between the right side of the gas injection casing provided with the first screw thread and the outer flange of the core male pipe, thereby further ensuring the sealing effect. The second seal may be formed of a seal ring and a seal groove that cooperate with each other, however, the present invention is not limited thereto, and other members capable of achieving an effective sealing function may be used.
In the suction drainage assisting mechanism according to another exemplary embodiment of the present invention, the core male pipe may further include a swivel fitting portion capable of enabling the core male pipe to swivel around its center axis under an external force. Here, the swivel fitting portion may be provided on an outer wall of the central core male pipe between the left side of the upper core pipe and the right side of the gas injection housing. For example, the swivel fitting may be one or more swivel holes provided on the outer wall of the core male tube at a location between the upper core tube and the gas injection housing. The rotary matching part is arranged, so that the central core male pipe can be rotated more conveniently. However, the present invention is not limited thereto, and the core male pipe may be rotated by, for example, a jig or the like, or may be rotated by the upper core pipe with the upper core pipe fixedly fitted with the core male pipe.
The adjustable annular suction drainage assisting mechanism of the drilling sand drainage pipeline can be arranged at a wellhead, a position of the pipeline downstream of a right angle turn and the like, and the suction effect generated by the mechanism can suck wellhead fluid (such as combustible gas such as natural gas or multiphase fluid such as gas-solid mixed phase and gas-liquid-solid mixed phase) into a sand drainage manifold, and can also greatly reduce local loss of the fluid caused by the right angle turn.
FIG. 1a illustrates a schematic cross-sectional view of an exemplary embodiment of an adjustable well sand removal line annular pumping drainage assist mechanism of the present invention in an axial direction; fig. 1b shows a schematic enlarged partial view of I in fig. 1. FIG. 2 illustrates a schematic exterior view of an exemplary embodiment of an adjustable drill sand removal line annular pumping aid mechanism of the present invention.
As shown in fig. 1a, 1b and 2, in one exemplary embodiment of the invention, the adjustable drill sand removal line annular suction drainage aid a' may comprise the following components: a base flange a ' 1, a gas injection joint a ' 2, an upper core tube a ' 3, an upper core tube flange a ' 4, an upper core tube snap ring a ' 5, a middle core tube (male) a ' 6, a gas injection housing a ' 7, an inner hexagonal screw a ' 8, and an upper core tube snap ring set screw a ' 9 (shown in fig. 2).
The upper core pipe flange A '4 and the upper core pipe A' 3 are connected through screw threads, can be connected through welding, and can be used as an integral workpiece. The upper core pipe flange A' 4 is used for connecting with a downstream hard pipeline, and can be in flange connection or clamp connection. The left side of the base flange A' 1 is connected with an upstream hard pipeline, and can be connected with the flange or the clamp. The right side of the base flange a ' 1 is fastened to the gas injection housing a ' 7 by a set of socket head cap screws a ' 8. The gas injection housing A '7 is radially perforated by a set of holes (not limited in number) and is threadably connected to the gas injection fitting A' 2. The outer cylindrical surface (large diameter) of the central tube (male) A' 6 is provided with threads. The central tube (male) A '6 is connected with the gas injection shell A' 7 by screw threads. The central core pipe (male) A ' 6 is rotated, and a part of the left side of the central core pipe (male) A ' 6 moves left and right in the gas injection shell A ' 7 under the action of the thread constraint fit. The left side of the central tube (male) A '6 is hung into the gas injection shell A' 7. The upper core pipe clamping ring A '5 is provided with a group of (2) and is mutually tensioned by an upper core pipe clamping ring fastening bolt A' 9. The central core pipe (male) A ' 6 and the upper core pipe A ' 3 are limited in axial displacement relative to each other by an upper core pipe snap ring A ' 5. The annular gap between the inner conical surface on the left side of the central tube (male) A '6 and the outer conical surface on the right side of the base flange A' 1 is the injection channel of the mechanism.
When the left and right ends of the adjustable drilling sand discharge pipeline annular suction auxiliary discharge mechanism A '(namely, the left side of the base flange A' 1 is connected with an upstream hard pipeline, the upper core pipe flange A '4 is connected with a downstream hard pipeline), only the middle core pipe (male) A' 6 in all the components is a movable part. The central core pipe (male) A '6 is rotated, the central core pipe (male) A' 6 can move left and right under the action of the screw thread, and the moving distance can be designed according to the requirement. When the central pipe (male) A ' 6 moves leftwards to the end, the inner conical surface at the left side of the central pipe (male) A ' 6 contacts with the outer conical surface at the right side of the base flange A ' 1, so that the injection channel is closed; the injection passage may be gradually opened as the core tube (male) A' 6 moves rightward. Even in the working state, the injection channel can be adjusted at any time by rotating the central core pipe (male) A' 6, and other parts do not need to be disassembled and replaced, and shutdown waiting is not needed. Fig. 1a and 1b show the open state of the injection channels of the adjustable drilling sand discharge line annular suction assist mechanism. Fig. 3a and 3b show the closed state of the injection channels of the adjustable drilling sand discharge line annular suction assist mechanism.
The number of gas injection joints A '2 on the gas injection housing A' 7 can be selected according to the amount of gas required. When the gas quantity is large, the quantity of the gas injection joints A' 2 is properly increased; and when the gas quantity is small, the redundant gas injection joint A' 2 can be blocked. High-pressure gas is injected into the gas injection casing A '7 through the gas injection joint A' 2, and is injected into the main passage at a high speed through an annular gap (injection passage) between an inner conical surface on the left side of the center pipe (male) A '6 and an outer conical surface on the right side of the base flange A' 1. The ejection and entrainment of the high velocity air flow creates a negative pressure in the vicinity of the base flange A' 1, thereby drawing in the upstream fluid while reducing the flow resistance of the upstream fluid. When the annular suction drainage assisting mechanism A 'of the adjustable drilling sand drainage pipeline is arranged near a wellhead, the annular suction drainage assisting mechanism A' can be used for sucking fluid (combustible gas, drilling circulating fluid and the like) near the wellhead to avoid overflowing the wellhead; when the annular suction drainage assisting mechanism of the A' adjustable drilling sand discharge pipeline is arranged at the downstream of the elbow bend, the annular suction drainage assisting mechanism can be used for reducing the local loss when fluid flows through the elbow bend, so that the flow is smoother. Fig. 4 illustrates an exterior appearance of an exemplary embodiment of the adjustable well sand removal line annular pumping aid mechanism of the present invention.
In summary, the adjustable annular suction drainage assisting mechanism for the drilling sand drainage pipeline of the invention has the following characteristics:
(1) The device can be used singly or used together with one or more devices of a radial azimuth stepless angle adjusting mechanism (authorized bulletin number: CN 106437579B) for a gas drilling manifold, a universal adjusting nipple (authorized bulletin number: CN 206220883U) for a gas drilling pipeline and a steering mechanism (CN 207377518U) for a planetary gas drilling manifold to form a manifold system with more perfect functions;
(2) By comprehensively applying the annular suction and drainage assisting mechanism of the adjustable drilling sand drainage pipeline in different numbers and different positions, the effective suction of wellhead fluid (including multiphase fluid which is returned to the ground surface in the drilling process besides the combustible gas) can be realized, wellhead fluid (such as combustible gas: natural gas; such as multiphase fluid: gas-solid, gas-liquid-solid and the like) is sucked into the sand drainage manifold, and local loss is greatly reduced in the flowing and conveying process of the surface sand drainage manifold;
(3) The annular suction drainage assisting mechanism of the adjustable drilling sand drainage pipeline can be independently connected with the gas injection pipeline, so that the suction capacity of the mechanism can be adjusted by adjusting the gas quantity;
(4) The annular suction drainage assisting mechanism of the adjustable drilling sand drainage pipeline can improve the safety when the open wellhead operation such as 'tripping and rubber core replacement' is carried out under the condition that a small amount of natural gas is discharged from a stratum, eliminate the safety risk problem possibly caused after the combustible gas (such as natural gas) in a shaft overflows the wellhead, improve the safety of the gas drilling operation of a gas bearing stratum section, and be more beneficial to the development of the speed-up advantage of the gas drilling.
Although the present invention has been described above with reference to the exemplary embodiments and the accompanying drawings, it should be apparent to those of ordinary skill in the art that various modifications can be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (8)
1. An adjustable drilling sand discharge pipeline annular suction helps row mechanism, its characterized in that, suction helps row mechanism includes: the base flange, the gas injection shell, the central core male pipe and the upper core pipe are coaxially arranged, wherein,
the base flange is provided with a left side part which can be connected with an upstream hard pipeline of the sand discharge pipeline, a right side part with an outer conical surface and an outer protruding part protruding outwards along the radial direction;
the gas injection shell comprises a left side part with a first inner diameter, a right side part with a second inner diameter and one or more gas injection joints, wherein the first inner diameter is larger than the second inner diameter, the left side part of the gas injection shell is fixedly connected with the outer protruding part of the foundation flange through an anti-rotation member, a first thread is arranged on the inner circumference of the right side part of the gas injection shell, and the gas injection joints can communicate a space corresponding to the first inner diameter with outside gas;
the middle core male pipe comprises a right side part which is inserted into the left side of the upper core pipe and is tightly contacted with the inner circumferential wall of the upper core pipe through a first sealing piece, a left side part with a second thread, and an inner conical surface which is formed on the inner circumference of the left side part of the middle core male pipe, wherein the second thread is arranged on the outer wall of the middle core male pipe and can be matched with the first thread so as to realize left or right movement of the middle core male pipe relative to the gas injection shell corresponding to the rotation of the middle core male pipe around a shaft, and the inner conical surface can be matched with the outer conical surface of the right side part of the base flange so as to form an adjustable injection channel communicated with the gas injection joint, so that the closing or opening of the injection channel is correspondingly realized corresponding to the left or right movement of the middle core male pipe;
the upper core pipe is provided with a right side part which can be connected with a downstream hard pipeline of the sand discharge pipeline;
the suction drainage assisting mechanism can be arranged at a wellhead or a position downstream of a right angle turn of a pipeline;
the suction drainage assisting mechanism further comprises an upper core pipe clamping piece, wherein the upper core pipe clamping piece can clamp the right side part of the middle core male pipe with the upper core pipe and limit axial displacement between the upper core pipe and the middle core male pipe;
the core male pipe further comprises a convex circumference portion which is arranged on the left side portion of the core male pipe and is located on the left side of the second thread and protrudes outwards in the radial direction, so that the tightness of the matching of the first thread and the second thread is improved.
2. The adjustable well sand removal line annular pumping drainage aid mechanism of claim 1 further comprising an upper core tube flange capable of connecting the right side of an upper core tube with a hard line downstream of the sand removal line.
3. The adjustable well sand removal line annular pumping drainage aid mechanism of claim 1 further comprising a second seal disposed between the right side of the gas injection housing and the outer convex circumferential portion of the core male tube.
4. The adjustable drilling sand removal pipeline annular suction drainage assisting mechanism according to claim 3, wherein the first sealing piece comprises a sealing ring and a sealing groove which are matched with each other, and the second sealing piece comprises a sealing ring and a sealing groove which are matched with each other.
5. The adjustable drilling sand removal line annular suction assist mechanism of claim 1 wherein the first seal comprises a seal ring and a seal groove that cooperate with each other.
6. The adjustable well sand removal line annular suction assist mechanism of claim 1 wherein the left side of the gas injection housing is securely connected to the outer projection of the base flange by a removable anti-rotation member.
7. The adjustable well sand removal pipeline annular suction drainage assisting mechanism according to claim 1, wherein the central core male pipe further comprises a rotary matching part capable of enabling the central core male pipe to rotate around the shaft under the action of external force.
8. The adjustable well sand removal line annular suction assist mechanism of claim 7 wherein the swivel fitting is disposed on an outer wall of the core male tube between the left side of the upper core tube and the right side of the gas injection housing.
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