CN109667541B - Dynamic balance self-propelled water jet drilling testing device and method under confining pressure state - Google Patents
Dynamic balance self-propelled water jet drilling testing device and method under confining pressure state Download PDFInfo
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- CN109667541B CN109667541B CN201811485186.9A CN201811485186A CN109667541B CN 109667541 B CN109667541 B CN 109667541B CN 201811485186 A CN201811485186 A CN 201811485186A CN 109667541 B CN109667541 B CN 109667541B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention discloses a dynamic balance self-propelled water jet drilling test device and a method under confining pressure state, wherein the test device comprises a confining pressure cabin, the confining pressure cabin comprises a cylindrical shell, a front end cover and a rear end cover, and the front end cover and the rear end cover are hermetically covered at two ends of the shell; an inner cylinder which is in sealing communication with the front end cover and can move axially is vertically arranged on the front end cover, a high-pressure water jet nozzle is arranged at the end part of the inner cylinder, and the other end of the inner cylinder is used as a connecting end and is in sealing communication with a high-pressure rubber pipe; an outer cylinder is sleeved outside the inner cylinder, one end of the outer cylinder is fixed on the front end cover in a sealing mode, and the other end of the outer cylinder is movably sealed with the outer wall of the inner cylinder; the testing device also comprises a dynamic balance weight mechanism for measuring the weights required by different confining pressures and a dynamic balance force measuring mechanism for measuring the propelling force of the water jet drilling. The invention can simulate the dynamic balance state of high-pressure water jet drilling and jet self-advancing, and can measure the propelling force of jet in real time.
Description
Technical Field
The invention belongs to the field of self-propelled high-pressure water jet, and particularly relates to a dynamic balance self-propelled water jet drilling testing device and method under a confining pressure state.
Background
The TRD (light Radius Drilling Technology) Technology is that at a certain depth of the bottom of a coal bed gas well, a diverter and a hydraulic cutting Technology are utilized to drill one or more horizontal holes which are nearly 90 degrees from a vertical well to form a reservoir transformation influence range which is radially distributed by taking a well hole as a center, more micro-cracks and crack systems in a near well zone and a far well can be communicated, stress concentration near the well hole is relieved, original cracks of the coal bed and guide fracturing and the like are communicated, and the aim of increasing the yield of the single well of the coal bed gas well is fulfilled. In order to further develop research on high-pressure water jet injection drilling, a testing device and a method for simulating self-advancing high-pressure water jet drilling under the surrounding pressure of a well bottom need to be developed, the self-advancing force during high-pressure water jet drilling under the conditions of different surrounding pressures, different hardness coal samples and different nozzle structures submerged states is tested under a dynamic balance state, the drilling speed of the coal samples with different hardness and the drilling effects of different nozzles are simulated, and a research basis is provided for field tests. The current testing device can not simulate the dynamic balance state when the jet self-advances and can not test the propelling force of the jet in real time when drilling by high-pressure water jet, and the defects are not beneficial to developing the high-pressure water jet yield-increasing research.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a dynamic balance self-propelled water jet drilling testing device and method under a confining pressure state, and overcomes the defects that the dynamic balance state during jet self-propulsion cannot be simulated and the propelling force of jet cannot be tested in real time when the conventional testing device drills a hole by high-pressure water jet.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dynamic balance self-propelled water jet drilling testing device under confining pressure comprises a confining pressure cabin, wherein the confining pressure cabin comprises a cylindrical shell, a front end cover and a rear end cover, and the front end cover and the rear end cover are hermetically covered at two ends of the shell; an inner cylinder which is hermetically communicated with the front end cover and can move axially is vertically arranged on the front end cover, a high-pressure water jet nozzle is arranged at the end part of the inner cylinder positioned in the confining pressure cabin, and a high-pressure rubber pipe is hermetically communicated with the end part of the inner cylinder outside the confining pressure cabin as a connecting end; an outer cylinder is sleeved outside the inner cylinder outside the confining pressure cabin, one end of the outer cylinder is fixed on the front end cover in a sealing mode, and the other end of the outer cylinder and the outer wall of the inner cylinder are movably sealed;
the testing device also comprises a dynamic balance weight mechanism and a dynamic balance force measuring mechanism; the dynamic balance weight mechanism comprises a pipeline clamp fixed on the connecting end, a cord is connected to the pipeline clamp, and a balance weight is hung and connected on the cord after the cord bypasses a fixed pulley fixed on the front end cover; the dynamic balance force measuring mechanism comprises a spring sleeved on the high-pressure rubber pipe, one end, close to the inner cylinder, of the spring is fixed on the high-pressure rubber pipe, one end, far away from the inner cylinder, of the spring is vertically connected with a sliding plate, the sliding plate can be slidably mounted on a sliding rail parallel to the high-pressure rubber pipe, the end part of the sliding rail is fixed on a first fixing plate close to the middle part of the spring, and the first fixing plate is parallel to the sliding plate and mounted on a channel steel which is positioned below the spring and fixed on; a force sensor is arranged between the first fixing plate and the sliding plate.
The invention also comprises the following technical characteristics:
optionally, two ends of the force sensor are provided with press blocks which are tightly attached to the first fixing plate and the sliding plate;
a connecting block tightly attached to the lower wall of the outer barrel is welded at one end of the channel steel, a fastening block sleeved on the upper wall of the outer barrel is connected to the upper end of the connecting block, and the fastening block and the connecting block are tightly and fixedly sleeved on the outer barrel;
two parallel side fixing plates which are positioned at two sides of the spring are connected to two side walls of the other end of the channel steel through bolts, the first fixing plate is vertically welded between the two side fixing plates, and a pressing block supporting plate fixed on the first fixing plate is arranged below a pressing block tightly attached to the first fixing plate; a second fixing plate vertically connected between the two side fixing plates is arranged below the pressing block tightly attached to the sliding plate;
the slide rail has two, and two slide rails parallel run through first fixed plate, second fixed plate and slide, and the tip of slide rail is fixed on first fixed plate.
Optionally, the side fixing plate is of a rectangular structure;
the first fixing plate is of a convex structure with an opening at the lower end, the upper part of the first fixing plate is used for being tightly attached to the pressing block, the two ends of the lower part of the first fixing plate are used for fixing the sliding rail, and the opening at the lower end of the first fixing plate is used for allowing the spring and the high-pressure rubber pipe to pass through;
the vertical section of the pressing block supporting plate is of an L-shaped structure, the end part of a transverse plate of the pressing block supporting plate is welded on the first fixing plate, and the upper end of a vertical plate of the pressing block supporting plate is provided with an arc-shaped groove which is in fit and close contact with the lower wall of the pressing block;
the second fixing plate is of an inverted U-shaped structure, and an opening at the lower end of the second fixing plate is used for a spring and a high-pressure rubber pipe to penetrate through; the upper end of the second fixing plate is provided with an arc-shaped groove which is closely matched with the lower wall of the pressing block;
the slide is the cruciform structure, and the upper portion of slide is used for hugging closely the briquetting, both ends are used for running through the slide rail about the slide, and the arc recess is seted up to the lower part of slide and is used for making things convenient for the high-pressure rubber pipe to pass.
Optionally, an anti-seismic pressure gauge, a safety overflow valve, a water injection and gas release port and two lifting rings for moving the surrounding cabin are arranged at the top of the shell; a fixed support frame used for fixing and supporting the coal sample is arranged in the confining pressure cabin, the fixed support frame is arranged close to the rear end cover, and a filter screen is further arranged in the confining pressure cabin above the fixed support frame and used for preventing drilling slag from being sprayed to block the safety overflow valve when high-pressure water jet is used for drilling; a water discharge stop valve is arranged on the front end cover; two confining pressure cabin brackets are arranged at the bottom of the shell. The anti-seismic pressure gauge is used for observing the pressure change condition in the confining pressure cabin, the pressure range is 0-16MPa, and the anti-seismic pressure gauge and the inlet of the safety overflow valve are also provided with a fine filter for filtering drill cuttings for the second time so as to ensure the normal use of the anti-seismic pressure gauge and the safety overflow valve. The safety overflow valve is used for keeping the required pressure in the confining pressure cabin during injection drilling, the pressure of the safety overflow valve is adjustable from 0-10MPa, and the water injection and air release port is used for injecting water and removing redundant air in the confining pressure cabin at the beginning. The stop valve that drains can prevent on the one hand that the safety overflow valve from blockking up and carry out the safety protection pressure release, and on the other hand can empty the residual water in the confined pressure cabin fast.
Optionally, a closed cavity is formed between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and a communicating rubber tube is hermetically communicated between the closed cavity and the confining pressure chamber to keep the water pressure in the confining pressure chamber balanced with the pressure in the closed cavity, so that the thrust of the water pressure in the confining pressure chamber to the inner cylinder is offset.
Optionally, the fixed pulley is mounted on the front end cover through a pulley frame; the cord between the fixed pulley and the pipeline clamp is parallel to the central axis of the inner cylinder.
Optionally, the rear end cover is detachably and hermetically covered at the end part of the shell, two first plug pin plates are arranged on the side wall of the rear end cover, two second plug pin plates which are respectively attached to the two first plug pin plates in parallel are arranged on the side wall of the end part of the shell attached to the rear end cover, and the first plug pin plates and the second plug pin plates are hinged through plugs and used for opening the rear end cover along the rotation of the plugs;
the rear end cover is provided with a handle for pulling the rear end cover;
and a bolt used for sealing and tightly attaching the rear end cover to the end part of the shell is arranged on the periphery of the edge of the rear end cover.
Optionally, a displacement scale for measuring the elongation of the spring is arranged on the outer side wall of the channel steel.
Optionally, the inner cylinder, the outer cylinder and the shell are coaxially arranged, a sealing element is arranged between the inner cylinder and the outer cylinder, and the sealing element is a sealing element with small resistance and reliable sealing;
the stroke of the inner cylinder moving along the outer cylinder is 500 mm;
the outer cylinder is fixed on the front end cover through a flange and sealed at the end face.
The invention also provides a dynamic balance self-propelled water jet drilling test method in a confining pressure state, which adopts the dynamic balance self-propelled water jet drilling test device in the confining pressure state to test and specifically comprises the following steps:
(A) the weight test comprises the following steps:
a1: after filling the water in the tank from the water injection and gas release port on the confining pressure tank, plugging the water injection and gas release port;
a2: a water pump is communicated with the high-pressure rubber pipe, a high-pressure water jet nozzle starts to spray water to the confining pressure cabin to reach the required confining pressure, and the reading of the high-pressure water jet nozzle is carried out through an anti-seismic pressure gauge;
a3: under the confining pressure, a counterweight required by the confining pressure is obtained by adjusting a counterweight to record the counterweight of the inner cylinder after uniform motion;
a4: adjusting a safety overflow valve, and recording the balance weights of the balance weights required by different confining pressures;
(B) the testing steps are as follows:
b1: opening a water discharge stop valve, quickly emptying residual water in the confining pressure cabin, and pulling the inner cylinder to be close to the front end cover;
b2: opening the rear end cover, putting the coal sample into the confining pressure cabin, fixing the coal sample, and screwing the rear end cover;
b3: setting the pressure of a safety overflow valve, and configuring corresponding counterweight weights under the confining pressure of the test group;
b4: starting a water pump to start high-pressure jet drilling, recording the numerical value of a force sensor, and reading the displacement of a spring from a displacement scale to obtain a stress value and a drilling speed; wherein, the self-propelled jet drilling propulsion is equal to the reading of the force sensor plus the elastic force of the spring; recording the pressure and flow in the water pump testing process;
b5: and when the inner cylinder completes one stroke, the self-propelled drilling is completed, the rear end cover is opened, the sample is taken out, and the drilling data is observed, measured and recorded.
B6: and repeating the steps, and measuring to obtain test data under different confining pressure submerged states, different hardness system coal beds and different nozzle structures.
Compared with the prior art, the invention has the beneficial technical effects that:
the dynamic balance self-propelled water jet drilling testing device under confining pressure state can simulate the tests of self-propelled high-pressure water jet drilling effect (drilling hole wall state, drilling hole diameter and drilling speed), mud pump working parameters, self-propelled force and the like under submerging states with different confining pressure, coal beds with different hardness systems and different nozzle structures. The invention solves the problems that the existing testing device can not simulate the dynamic balance state of the self-propelled jet drilling under the confining pressure submerging state and can not test the propelling force of the self-propelled jet drilling in real time.
And (II) the dynamic balance weight mechanism converts the transverse force overcoming the sealing resistance into the gravity of the balance weight, and the balance weight is accurately balanced by replacing different balance weights in the test process, wherein the uniform motion of the inner barrel is taken as the standard during the balance weight.
In the dynamic balance force measuring mechanism, when the self-propelled jet drilling is carried out, the spring drives the sliding plate to move, the sliding plate applies pressure to the force sensor between the sliding plate and the first fixing plate, and the spring extends to obtain that the sum of the elastic force of the spring and the data of the force sensor is the propelling force of the self-propelled jet drilling of the spray head.
(IV) the anti-seismic pressure gauge is used for observing the pressure change condition in the confining pressure cabin, the pressure range is 0-16MPa, and the anti-seismic pressure gauge and the inlet of the safety overflow valve are also provided with fine filters for filtering drill cuttings for the second time so as to ensure the normal use of the anti-seismic pressure gauge and the safety overflow valve. The safety overflow valve is used for keeping the required pressure in the confining pressure cabin during injection drilling, the pressure of the safety overflow valve is adjustable from 0-10MPa, and the water injection and air release port is used for injecting water and removing redundant air in the confining pressure cabin at the beginning. The stop valve that drains can prevent on the one hand that the safety overflow valve from blockking up and carry out the safety protection pressure release, and on the other hand can empty the residual water in the confined pressure cabin fast.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic view of the overall structure of the inner barrel of the present invention in an initial state.
FIG. 3 is a schematic view of the overall structure of the inner barrel of the present invention in the final state.
Fig. 4 is a schematic view of the internal structure of the confining pressure cabin of the invention.
Fig. 5 is a schematic structural diagram of a dynamic balance force measuring mechanism of the present invention.
The reference numerals in the figures denote: 1-surrounding cabin, 2-dynamic balance weight mechanism, 3-dynamic balance force measuring mechanism, 4-inner cylinder, 5-high pressure water jet nozzle, 6-high pressure rubber tube, 7-outer cylinder, 8-communicating rubber tube, 9-coal sample;
11-shell, 12-front end cover, 13-back end cover, 14-fixed supporting frame, 15-filtering net,
111-an anti-seismic pressure gauge, 112-a safety overflow valve, 113-a water injection and gas release port, 114-a hanging ring, 115-a confining pressure cabin bracket and 116-a second bolt plate; 121-water discharge stop valve; 131-a first latch plate, 132-a handle;
21-pipeline clamp, 22-string, 23-fixed pulley and 24-counterweight;
31-spring, 32-sliding plate, 33-sliding rail, 34-first fixing plate, 341-pressing block supporting plate, 35-channel steel, 351-connecting block, 352-fastening block, 353-displacement scale, 36-force sensor, 361-pressing block, 37-side fixing plate and 38-second fixing plate.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
as shown in fig. 1 to 5, the present embodiment provides a dynamic balance self-propelled water jet drilling test device under confining pressure, which includes a confining pressure chamber 1, where the confining pressure chamber 1 includes a cylindrical housing 11, and a front end cap 12 and a rear end cap 13 hermetically covering both ends of the housing; an inner cylinder 4 which is hermetically communicated with the front end cover 12 and can move axially is vertically arranged on the front end cover 12, a high-pressure water jet nozzle 5 is arranged at the end part of the inner cylinder 4 positioned in the confining pressure cabin 1, and a high-pressure rubber pipe 6 is hermetically communicated with the end part of the inner cylinder 4 outside the confining pressure cabin 1 as a connecting end; an outer cylinder 7 is sleeved outside the inner cylinder 4 outside the confining pressure cabin 1, one end of the outer cylinder 7 is fixed on a front end cover 12 in a sealing mode, and the other end of the outer cylinder 7 is movably sealed with the outer wall of the inner cylinder 4;
the testing device also comprises a dynamic balance weight mechanism 2 and a dynamic balance force measuring mechanism 3; the dynamic balance weight mechanism 2 comprises a pipeline clamp 21 fixed on the connecting end, a cord 22 is connected on the pipeline clamp 21, and a balance weight 24 is hung and connected on the cord 22 after the cord 22 bypasses a fixed pulley 23 fixed on the front end cover 12; the dynamic balance force measuring mechanism 3 comprises a spring 31 sleeved on the high-pressure rubber pipe 6, one end, close to the inner cylinder 4, of the spring 31 is fixed on the high-pressure rubber pipe 6, the other end of the spring 31 is vertically connected with a sliding plate 32, the sliding plate 32 can be slidably mounted on a sliding rail 33 parallel to the high-pressure rubber pipe 6, the sliding rail 33 is vertically fixed on a first fixing plate 34 close to the middle part of the spring 31, and the first fixing plate 34 is mounted on a channel steel 35 which is positioned below the spring 31 and fixed on the outer cylinder 7; a force sensor 36 is provided between the first fixing plate 34 and the slide plate 32.
In this embodiment, two ends of the force sensor 36 are provided with pressing blocks 361 tightly attached to the first fixing plate 34 and the sliding plate 32; a connecting block 351 tightly attached to the lower wall of the outer cylinder 7 is welded at one end of the channel steel 35, a fastening block 352 sleeved on the upper wall of the outer cylinder 7 is connected to the upper end of the connecting block 351, and the fastening block 352 and the connecting block 351 are tightly and fixedly sleeved on the outer cylinder 7; two parallel opposite side fixing plates 37 which are positioned at two sides of the spring 31 are connected to two side walls at the other end of the channel steel 35 through bolts, the first fixing plate 34 is vertically welded between the two side fixing plates 37, and a pressing block supporting plate 341 fixed on the first fixing plate 34 is arranged below a pressing block 361 tightly attached to the first fixing plate 34; a second fixing plate 38 vertically connected between the two side fixing plates 37 is arranged below the pressing block 361 tightly attached to the sliding plate 32; the number of the slide rails 33 is two, two slide rails 33 parallelly penetrate the first fixing plate 34, the second fixing plate 38 and the slide plate 32, and the end portions of the slide rails 33 are fixed on the first fixing plate 34.
Specifically, the side fixing plate 37 has a rectangular structure; the first fixing plate 34 is a convex structure with an opening at the lower end, the upper part of the first fixing plate 34 is used for clinging to the pressing block 361, the two ends of the lower part of the first fixing plate 34 are used for fixing the sliding rail 33, and the opening at the lower end of the first fixing plate 34 is used for the spring 31 and the high-pressure rubber pipe 6 to pass through; the vertical section of the pressing block supporting plate 341 is of an L-shaped structure, the end part of the transverse plate of the pressing block supporting plate 341 is welded on the first fixing plate 34, and the upper end of the vertical plate of the pressing block supporting plate 341 is provided with an arc-shaped groove which is matched and attached to the lower wall of the pressing block 361; the second fixing plate 38 is of an inverted U-shaped structure, and an opening at the lower end of the second fixing plate 38 is used for the spring 31 and the high-pressure rubber pipe 6 to penetrate through; the upper end of the second fixing plate 38 is provided with an arc-shaped groove which is closely matched with the lower wall of the pressing block 361; the sliding plate 32 is of a cross structure, the upper part of the sliding plate 32 is used for being tightly attached to the pressing block 361, the left end and the right end of the sliding plate 32 are used for penetrating through the sliding rail 33, and the lower part of the sliding plate 32 is provided with an arc-shaped groove for facilitating the high-pressure rubber pipe 6 to penetrate through.
The top of the shell 11 is provided with an anti-seismic pressure gauge 111, a safety overflow valve 112, a water injection and gas release port 113 and two lifting rings 114 for moving the surrounding pressure cabin; a fixed support frame 14 used for fixing and supporting the coal sample is arranged in the confining pressure cabin 1, the fixed support frame 14 is arranged close to the rear end cover 13, and a filter screen 15 is further arranged in the confining pressure cabin 1 above the fixed support frame 14 and used for preventing the safety overflow valve 112 from being blocked due to the injection of drilling slag during high-pressure water jet drilling; a water discharge stop valve 121 is arranged on the front end cover 12; the bottom of the shell 11 is provided with two confining pressure chamber brackets 115 for supporting the confining pressure chamber 1 and fixing with the ground. The anti-seismic pressure gauge 111 is used for observing the pressure change condition of 1 in the confining pressure cabin, the pressure range is 0-16MPa, and fine filters are further arranged at inlets of the anti-seismic pressure gauge 111 and the safety overflow valve 112 and used for filtering drill cuttings for the second time, so that the normal use of the anti-seismic pressure gauge 111 and the safety overflow valve 112 is guaranteed. The safety overflow valve 112 is used for keeping the required pressure in the confining pressure cabin 1 during injection drilling, the pressure of the safety overflow valve 112 is adjustable from 0 to 10MPa, and the water injection and air release port 113 is used for initially injecting water and removing redundant air in the confining pressure cabin 1. The water discharge stop valve 121 can prevent the safety overflow valve 112 from being blocked for safety protection and pressure relief, and can quickly discharge the residual water in the surrounding ballast 1.
A closed cavity is formed between the inner wall of the outer barrel 7 and the outer wall of the inner barrel 4, and a communicating rubber tube 8 is hermetically communicated between the closed cavity and the confining pressure cabin 1 and used for keeping the water pressure in the confining pressure cabin 1 and the pressure in the closed cavity balanced, so that the thrust of the water pressure in the confining pressure cabin 1 to the inner barrel 4 is offset.
The fixed pulley 23 is installed on the front end cover 12 through a pulley yoke, a dynamic balance weight mechanism converts the transverse force overcoming the sealing resistance into the gravity of a balance weight, accurate balance weight is carried out by replacing different balance weights in the test process, and the uniform motion of the inner barrel is taken as the standard during the balance weight.
In this embodiment, the rear end cover 13 is detachably and hermetically covered at the end of the housing 11, two first latch plates 131 are arranged on the side wall of the rear end cover 13, two second latch plates 116 which are respectively attached to the two first latch plates 131 in parallel are arranged on the side wall of the end of the housing 11 which is attached to the rear end cover 13, and the first latch plates 131 and the second latch plates 116 are hinged through latches and are used for opening the rear end cover 13 by rotating along the latches; the rear end cover 13 is provided with a handle 132 for pulling the rear end cover 13; bolts for tightly sealing and fixing the rear end cover 13 to the end of the housing 11 are mounted around the edge of the rear end cover 13. Through the above arrangement, the rear end cover 13 can be opened in a rotating manner, so that the simulated coal sample can be replaced.
And a displacement scale 353 for measuring the elongation of the spring 31 is arranged on the outer side wall of the channel steel 35.
The inner cylinder 4, the outer cylinder 7 and the shell 11 are coaxially arranged, a sealing element is arranged between the inner cylinder 4 and the outer cylinder 7, and the sealing element is a sealing element with small resistance and reliable sealing; the travel of the inner cylinder 4 moving along the outer cylinder 7 is 500 mm; the outer cylinder 7 is fixed to the front end cover 12 by a flange and is sealed at the end face.
Example 2:
the embodiment also provides a dynamic balance self-propelled water jet drilling test method in a confining pressure state, the test method adopts the dynamic balance self-propelled water jet drilling test device in the confining pressure state in the embodiment 1 to perform testing, and the method specifically comprises the following steps:
(A) the weight test comprises the following steps:
a1: after filling the water in the tank from the water injection and gas release port on the confining pressure tank, plugging the water injection and gas release port;
a2: a water pump is communicated with the high-pressure rubber pipe, a high-pressure water jet nozzle starts to spray water to the confining pressure cabin to reach the required confining pressure, and the reading of the high-pressure water jet nozzle is carried out through an anti-seismic pressure gauge;
a3: under the confining pressure, a counterweight required by the confining pressure is obtained by adjusting a counterweight to record the counterweight of the inner cylinder after uniform motion;
a4: adjusting a safety overflow valve, and recording the balance weights of the balance weights required by different confining pressures;
(B) the testing steps are as follows:
b1: opening a water discharge stop valve, quickly emptying residual water in the confining pressure cabin, and pulling the inner cylinder to be close to the front end cover;
b2: opening the rear end cover, putting the coal sample into the confining pressure cabin, fixing the coal sample, and screwing the rear end cover;
b3: setting the pressure of a safety overflow valve, and configuring corresponding counterweight weights under the confining pressure of the test group;
b4: starting a water pump to start high-pressure jet drilling, recording the numerical value of a force sensor, and reading the displacement of a spring from a displacement scale to obtain a stress value and a drilling speed; wherein, the self-propelled jet drilling propulsion is equal to the reading of the force sensor plus the elastic force of the spring; recording the pressure and flow in the water pump testing process;
b5: and when the inner barrel finishes one stroke, self-propelled drilling is finished, the rear end cover is opened, the sample is taken out, and drilling data including the state of the wall of the drilled hole, the diameter of the drilled hole and the drilling speed are observed, measured and recorded.
B6: and repeating the steps, and measuring to obtain test data under different confining pressure submerged states, different hardness system coal beds and different nozzle structures, wherein the test data comprises the propelling force.
Claims (10)
1. A dynamic balance self-propelled water jet drilling testing device under confining pressure comprises a confining pressure chamber (1), wherein the confining pressure chamber (1) comprises a cylindrical shell (11), a front end cover (12) and a rear end cover (13), wherein the front end cover and the rear end cover are hermetically covered at two ends of the shell; the device is characterized in that an inner cylinder (4) which penetrates through the front end cover (12) in a sealing manner and can move axially is vertically arranged on the front end cover (12), a high-pressure water jet nozzle (5) is arranged at the end part of the inner cylinder (4) positioned in the ballast surrounding chamber (1), and a high-pressure rubber pipe (6) is communicated with the end part of the inner cylinder (4) outside the ballast surrounding chamber (1) in a sealing manner as a connecting end; an outer cylinder (7) is sleeved outside the inner cylinder (4) outside the surrounding cabin (1), one end of the outer cylinder (7) is fixed on the front end cover (12) in a sealing mode, and the other end of the outer cylinder (7) is movably sealed with the outer wall of the inner cylinder (4);
the testing device also comprises a dynamic balance weight mechanism (2) and a dynamic balance force measuring mechanism (3); the dynamic balance weight mechanism (2) comprises a pipeline clamp (21) fixed on the connecting end, a wire rope (22) is connected to the pipeline clamp (21), and a balance weight (24) is hung and connected to the wire rope (22) after the wire rope (22) bypasses a fixed pulley (23) fixed on the front end cover (12); the dynamic balance force measuring mechanism (3) comprises a spring (31) sleeved on the high-pressure rubber pipe (6), one end, close to the inner cylinder (4), of the spring (31) is fixed on the high-pressure rubber pipe (6), the other end of the spring is vertically connected with a sliding plate (32), the sliding plate (32) is slidably mounted on a sliding rail (33) parallel to the high-pressure rubber pipe (6), the sliding rail (33) is vertically fixed on a first fixing plate (34) close to the middle part of the spring (31), and the first fixing plate (34) is mounted on a channel steel (35) which is positioned below the spring (31) and fixed on the outer cylinder (7); a force sensor (36) is arranged between the first fixing plate (34) and the slide plate (32).
2. The dynamic balance self-propelled water jet drilling testing device under confining pressure state as claimed in claim 1, wherein both ends of the force sensor (36) are provided with pressing blocks (361) tightly attached to the first fixing plate (34) and the sliding plate (32);
a connecting block (351) tightly attached to the lower wall of the outer barrel (7) is welded at one end of the channel steel (35), a fastening block (352) sleeved on the upper wall of the outer barrel (7) is connected to the upper end of the connecting block (351), and the fastening block (352) and the connecting block (351) are tightly fixed and sleeved on the outer barrel (7);
two parallel opposite side fixing plates (37) which are positioned at two sides of the spring (31) are connected to two side walls at the other end of the channel steel (35) through bolts, the first fixing plate (34) is vertically welded between the two side fixing plates (37), and a pressing block supporting plate (341) fixed on the first fixing plate (34) is arranged below a pressing block (361) tightly attached to the first fixing plate (34); a second fixing plate (38) vertically connected between the two side fixing plates (37) is arranged below the pressing block (361) tightly attached to the sliding plate (32);
the number of the slide rails (33) is two, the two slide rails (33) penetrate through the first fixing plate (34), the second fixing plate (38) and the slide plate (32) in parallel, and the end parts of the slide rails (33) are fixed on the first fixing plate (34).
3. The dynamic balance self-propelled water jet drilling test device under confining pressure condition as recited in claim 2, wherein the side fixing plate (37) is a rectangular structure;
the first fixing plate (34) is of a convex structure with an opening at the lower end, the upper part of the first fixing plate (34) is used for being tightly attached to the pressing block (361), the two ends of the lower part of the first fixing plate (34) are used for fixing the sliding rail (33), and the opening at the lower end of the first fixing plate (34) is used for allowing the spring (31) and the high-pressure rubber pipe (6) to penetrate through;
the vertical section of the pressing block supporting plate (341) is of an L-shaped structure, the end part of a transverse plate of the pressing block supporting plate (341) is welded on the first fixing plate (34), and an arc-shaped groove which is tightly attached to the lower wall of the pressing block (361) in a matched manner is formed in the upper end of the vertical plate of the pressing block supporting plate (341);
the second fixing plate (38) is of an inverted U-shaped structure, and an opening at the lower end of the second fixing plate (38) is used for the spring (31) and the high-pressure rubber pipe (6) to penetrate through; the upper end of the second fixing plate (38) is provided with an arc-shaped groove which is tightly attached to the lower wall of the pressing block (361) in a matching manner;
the sliding plate (32) is of a cross structure, the upper portion of the sliding plate (32) is used for being tightly attached to the pressing block (361), the left end and the right end of the sliding plate (32) are used for penetrating through the sliding rail (33), and the lower portion of the sliding plate (32) is provided with an arc-shaped groove for enabling a high-pressure rubber pipe (6) to penetrate through conveniently.
4. The dynamic balance self-propelled water jet drilling testing device under the confining pressure state as recited in claim 3, characterized in that a shock-proof pressure gauge (111), a safety overflow valve (112), a water injection and air release port (113) and two lifting rings (114) for moving the confining pressure chamber are arranged at the top of the shell (11); a fixed support frame (14) used for fixing and supporting the coal sample is arranged in the surrounding cabin (1), the fixed support frame (14) is arranged close to the rear end cover (13), and a filter screen (15) is further arranged in the surrounding cabin (1) above the fixed support frame (14) and used for preventing the drilling slag from being sprayed to block the safety overflow valve (112) during high-pressure water jet drilling; a water discharge stop valve (121) is arranged on the front end cover (12); two confining pressure cabin brackets (115) are arranged at the bottom of the shell (11).
5. The self-propelled water jet drilling test device with dynamic balance under confining pressure as claimed in claim 4 is characterized in that a sealed cavity is formed between the inner wall of the outer cylinder (7) and the outer wall of the inner cylinder (4), and a communication rubber tube (8) is hermetically communicated between the sealed cavity and the confining pressure chamber (1) for keeping the water pressure in the confining pressure chamber (1) balanced with the pressure in the sealed cavity so as to counteract the thrust of the water pressure in the confining pressure chamber (1) on the inner cylinder (4).
6. The dynamic balance self-propelled water jet drilling test device under confining pressure condition as recited in claim 1, characterized in that the fixed pulley (23) is mounted on the front end cover (12) through a pulley yoke; the wire rope (22) positioned between the fixed pulley (23) and the pipeline clamp (21) is parallel to the central axis of the inner cylinder (4).
7. The dynamic balance self-propelled water jet drilling testing device under confining pressure state as claimed in claim 1, wherein the rear end cover (13) is detachably sealed and covered on the end portion of the housing (11), two first latch plates (131) are arranged on the side wall of the rear end cover (13), two second latch plates (116) respectively attached to the two first latch plates (131) in parallel are arranged on the side wall of the end portion of the housing (11) attached to the rear end cover (13), and the first latch plates (131) and the second latch plates (116) are hinged through latches and used for opening the rear end cover (13) along the rotation of the latches;
the rear end cover (13) is provided with a handle (132) used for pulling the rear end cover (13);
and bolts used for sealing and tightly fixing the rear end cover (13) at the end part of the shell (11) are arranged on the periphery of the edge of the rear end cover (13).
8. The self-propelled water jet drilling test device with dynamic balance in confining pressure state as claimed in claim 5 is characterized in that a displacement scale (353) for measuring the elongation of the spring (31) is arranged on the outer side wall of the channel steel (35).
9. The confining pressure state dynamic balance self-propelled water jet drilling test device as recited in claim 1, characterized in that the inner cylinder (4), the outer cylinder (7) and the housing (11) are coaxially arranged, a sealing element is arranged between the inner cylinder (4) and the outer cylinder (7), and the sealing element is a sealing element with small resistance and reliable sealing;
the stroke of the inner cylinder (4) moving along the outer cylinder (7) is 500 mm;
the outer cylinder (7) is fixed on the front end cover (12) through a flange and sealed at the end face.
10. A dynamic balance self-propelled water jet drilling test method under confining pressure is characterized in that the dynamic balance self-propelled water jet drilling test device under confining pressure of claim 8 is used for testing, and the method specifically comprises the following steps:
(A) the weight test comprises the following steps:
a1: after filling the water in the tank from the water injection and gas release port on the confining pressure tank, plugging the water injection and gas release port;
a2: a water pump is communicated with the high-pressure rubber pipe, a high-pressure water jet nozzle starts to spray water to the confining pressure cabin to reach the required confining pressure, and the reading of the high-pressure water jet nozzle is carried out through an anti-seismic pressure gauge;
a3: under the confining pressure, a counterweight required by the confining pressure is obtained by adjusting a counterweight to record the counterweight of the inner cylinder after uniform motion;
a4: adjusting a safety overflow valve, and recording the balance weights of the balance weights required by different confining pressures;
(B) the testing steps are as follows:
b1: opening a water discharge stop valve, quickly emptying residual water in the confining pressure cabin, and pulling the inner cylinder to be close to the front end cover;
b2: opening the rear end cover, putting the coal sample into the confining pressure cabin, fixing the coal sample, and screwing the rear end cover;
b3: setting the pressure of a safety overflow valve, and configuring corresponding counterweight weights under confining pressure;
b4: starting a water pump to start high-pressure jet drilling, recording the numerical value of a force sensor, and reading the displacement of a spring from a displacement scale to obtain a stress value and a drilling speed; wherein, the self-propelled jet drilling propulsion is equal to the reading of the force sensor plus the elastic force of the spring; recording the pressure and flow in the water pump testing process;
b5: when the inner cylinder completes one stroke, self-propelled drilling is completed, the rear end cover is opened, the sample is taken out, and drilling data are observed, measured and recorded;
b6: and repeating the steps, and measuring to obtain test data under different confining pressure submerged states, different hardness system coal beds and different nozzle structures.
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| CN201811485186.9A CN109667541B (en) | 2018-12-06 | 2018-12-06 | Dynamic balance self-propelled water jet drilling testing device and method under confining pressure state |
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| CN105234826A (en) * | 2015-09-28 | 2016-01-13 | 重庆大学 | Downhole confining pressure abrasive material jet flow simulation experimental device and method |
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