CN110374581B - Ultrahigh-temperature mechanical directional tool face measuring device and design method thereof - Google Patents
Ultrahigh-temperature mechanical directional tool face measuring device and design method thereof Download PDFInfo
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Abstract
The invention discloses a design method of an ultrahigh-temperature mechanical orientation tool face measuring device, which is used for measuring an underground orientation tool face angle in an ultrahigh-temperature environment, and comprises a shell, a valve body, a valve block and an upper joint, wherein the valve body and the valve block are arranged in the shell, and the design method comprises the following steps: a main orifice is arranged at the center of a bottom disc of the valve body; determining the number, size and hole distribution positions of the diversion holes arranged at the bottom disc edge of the valve body according to the directional precision requirement of the drilled stratum; the shape and size of the valve block are determined based on the shape of the bottom disc of the valve body and the number of the diversion holes, so that the valve block can completely shield the corresponding diversion holes when rotating in the shell under the action of gravity. The measuring device is a unique mechanical underground tool face pressure signal transmission device, and does not contain electronic components inside, so that the measuring device is not influenced by high temperature and can realize directional construction of the ultra-high temperature horizontal well.
Description
Technical Field
The invention relates to the field of ultrahigh-temperature directional drilling, in particular to a tool face measuring device in directional drilling in an ultrahigh-temperature rock mass and a design method thereof.
Background
As oil and gas resources in China gradually enter deep strata, in order to improve the yield of a single well and enlarge the contact area of an oil layer, a horizontal well type is generally adopted for ultra-deep well drilling. In addition, with the adjustment of energy structures in China, development of hot dry rock is listed in energy development plans in China, related research and customs work is gradually developed, and 2-3 hot dry rock power generation demonstration projects are built in the plans in China.
The problem of directional drilling of ultrahigh-temperature strata is faced in both oil and gas development and hot dry rock exploration, and the core problem of horizontal well orientation is accurate measurement of the face angle of a directional tool, so that research on the measurement of the face angle of the directional tool of the ultrahigh-temperature horizontal well is necessary, and technical support is provided for directional drilling of the ultrahigh-temperature horizontal well.
Disclosure of Invention
One of the technical problems to be solved by the present invention is to provide a design method for an ultra-high temperature mechanical orientation tool face measurement apparatus, the measurement apparatus is used for measuring a downhole orientation tool face angle in an ultra-high temperature environment, and comprises a housing, a valve body and a valve block mounted in the housing, and an upper joint for compressing the valve body and the valve block in the housing, the design method comprises: a main throttling hole is formed in the center of the bottom disc of the valve body; determining the number, size and hole distribution positions of the diversion holes arranged at the bottom disc edge of the valve body according to the directional precision requirement of the drilled stratum; the size of the valve block is determined based on the shape of the bottom disk of the valve body and the number of the branch flow holes so that the corresponding branch flow holes can be completely blocked when the valve block rotates in the housing due to the action of gravity.
Preferably, the number of the diverting holes of the valve body is determined by: calculating the division number of the bottom disc of the valve body according to the allowable error of the specific construction project; and determining the number of the shunting holes of the valve body based on the calculated division number.
Preferably, the number of the diversion holes is calculated according to the following expression:
wherein n represents the number of the shunting holes, m represents the division number of the bottom disk of the valve body,
wherein the content of the first and second substances,
and the size of the allowable error of the specific construction project is shown.
Preferably, the size of the diversion hole of the valve body is determined by the steps of: according to the maximum allowable riser pressure variation value DeltaPmaxTaking a set number of j pressure drop values delta Pi(ii) a According to each pressure drop value DeltaPiCalculating the equivalent sectional area A of the shunting hole corresponding to the pressure drop;
wherein the content of the first and second substances,
n represents the number of the shunting holes;
c is a flow coefficient, Q represents a flow rate, and ρ represents a fluid density.
Preferably, the distribution position of the diversion holes of the valve body is determined by the following steps: dividing a bottom disc of the valve body into m sectors, and selecting n subareas from the m sectors at intervals to respectively arrange each shunting hole; aiming at the arrangement of each shunting hole, the left end and the right end of each shunting hole are tangent to a fan-shaped boundary line obtained when the bottom disc of the valve body is divided into m parts, and the center position of each shunting hole is positioned on the fan-shaped middle line.
Preferably, the sector shape obtained when the bottom disk of the valve body is divided into m parts is determined as the size of the valve block.
According to another aspect of the embodiments of the present invention, there is also provided an ultrahigh-temperature mechanical orientation tool face measurement device obtained by the above design method, for measuring a downhole orientation tool face angle in an ultrahigh-temperature environment, the measurement device including: a housing; the valve body is arranged in the shell, a main throttling hole is formed in the center of a bottom disc of the valve body, and a plurality of shunting holes different in size are formed in the edge of the bottom disc; at least one valve block arranged in the shell and used for completely shielding the corresponding diversion hole of the valve body when rotating in the shell under the action of the gravity of the valve block during the directional operation; an upper fitting for compressing the valve body and valve block in the housing.
Preferably, when the valve body and the valve block are both multiple, the multiple valve bodies are cascaded and arranged in a cavity formed by the upper joint and the shell, the valve block is arranged in a cavity formed by the valve body and a cavity formed by the valve body and the upper joint, and the valve block can rotate circumferentially along the cavity where the valve block is located under the action of gravity.
Preferably, when the valve body and the valve block are both one, the primary orifice and all the splitter orifices are distributed in a bottom disc of the valve body.
According to another aspect of the embodiments of the present invention, there is also provided an ultrahigh-temperature mechanical orientation tool face angle measurement system, the system including: an orientation joint; the measuring device is arranged on the directional joint, and when the tool surface of the directional joint swings to different positions, the drilling fluid flowing through the measuring device is throttled to different degrees, so that different pressure drops are generated; the pressure monitoring device is arranged at the ground end and used for monitoring the pressure of the ground riser which changes along with the pressure drop change of the measuring device; and the directional tool face angle determining device is connected with the pressure monitoring device and determines the directional tool face angle of the drilling well according to the pressure of the ground riser based on the preset tool face angle-pressure relation.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the invention provides a mechanical underground tool surface measuring device based on ground monitoring underground pressure signal change and a design method thereof, aiming at the problem that a traditional Measurement While Drilling (MWD) system cannot adapt to ultrahigh-temperature stratum directional construction. Before the tool is put into the well bottom, a matched measuring device is installed, the initial tool face angle is checked and recorded, and when the tool face is placed in the directional construction, the change of the underground pressure signal is monitored in real time through a ground rotary drilling tool to measure the anti-torsion angle and the current tool face angle. The measuring device is a unique mechanical underground tool face pressure signal transmission device, and electronic components are not contained in the device, so that the measuring device is not influenced by high temperature, and directional construction of the ultra-high temperature horizontal well can be realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure and/or process particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technology or prior art of the present application and are incorporated in and constitute a part of this specification. The drawings expressing embodiments of the present application are used for explaining the technical solutions of the present application, and should not be construed as limiting the technical solutions of the present application.
FIG. 1 is a schematic cross-sectional view of an ultra-high temperature mechanical orientation tool face measurement apparatus according to an embodiment of the present invention;
FIGS. 2(A), (B) and (C) are schematic cross-sectional views at A-A, B-B and C-C, respectively, of the UHT mechanical orientation tool face measuring device of FIG. 1;
fig. 3(a), (B) and (C) are respectively schematic three-dimensional structures of respective valve bodies of the superhigh temperature mechanical orientation tool face measuring apparatus shown in fig. 1.
FIG. 4 is a schematic diagram of a virtual division of a bottom disk of a valve body of a measuring device into m parts, wherein a is an example of a central main orifice, b is a schematic diagram of a diversion orifice, and c is a schematic diagram of a bias weight (valve block);
fig. 5 is a schematic view of the distribution mode of the shunting holes on a single divided sector.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The embodiments and the features of the embodiments can be combined with each other without conflict, and the formed technical scheme is within the protection scope of the present invention.
For the horizontal well drilling tool face angle measurement technology, Measurement While Drilling (MWD) systems are mainly adopted at home and abroad to measure the horizontal well tool face angle. The directional construction of the ultra-high temperature horizontal well widely exists in oil and gas development and hot dry rock resource exploration in China, the traditional MWD system can measure main engineering parameters in the directional construction in real time, but the temperature resistance is poor, and the domestic and foreign mature MWD system can resist 175 ℃ and can not meet the requirement of the directional drilling construction of the ultra-high temperature horizontal well in China.
For example, the number of ultra-deep wells above 8000m in the Tarim basin in Xinjiang is continuously increased, the bottom temperature is over 200 ℃, and the temperature of the dry hot rock exploration well GR1 drilled in Qinghai is as high as 236 ℃ at the bottom 3705m of the dry hot rock exploration well. At present, the main MWD systems at home and abroad cannot meet the ultra-high temperature (when the bottom temperature reaches more than 200 ℃, the bottom temperature is regarded as the ultra-high temperature level) horizontal well directional drilling construction.
Because the application of electronic components is limited by temperature, the traditional MWD system cannot be used for tool face measurement in directional construction of ultra-high temperature horizontal wells. Therefore, in order to avoid the limitation of electronic components, the embodiment of the invention provides a directional tool surface measuring device based on the dynamic pressure change monitoring of a ground riser. The measuring device of the embodiment can accurately measure the directional tool face in the drilling process of the horizontal well without being influenced by an ultrahigh-temperature environment, and provides basic parameters and technical support for the directional construction of the horizontal well of an ultrahigh-temperature stratum through the measured tool face angle.
In one embodiment, the measurement device comprises: a housing; the valve body is arranged in the shell, a main throttling hole is formed in the center of a bottom disc of the valve body, and a plurality of shunting holes different in size are formed in the edge of the bottom disc; at least one valve block arranged in the shell and used for completely shielding the corresponding diversion hole of the valve body when rotating in the shell under the action of the gravity of the valve block during the directional operation; an upper connector for compressing the valve body and valve block in the housing. When valve body and valve piece are a plurality of, a plurality of valve body cascade are in the cavity that top connection and casing formed, the valve piece sets up in the cavity that cavity and valve body formed and the cavity that valve body and top connection formed, the valve piece can carry out circumferential direction along its cavity of locating under the effect of gravity.
The measuring device according to the invention is described below with reference to a specific embodiment in which the valve body and the valve block are each present in a plurality and in equal numbers.
A cross-sectional view of the measuring apparatus designed to set the tool face measurement accuracy to 60 ° is shown in fig. 1. The measuring device includes: an upper connector 501, a housing 502, a first valve body 503, a first valve block 504, a second valve body 505, a second valve block 506, a third valve body 507, and a third valve block 508. The main functions of these parts are described separately below.
Upper joint
The upper joint is one of the important components of the device, and the upper joint mainly plays a role in pressing the valve body and the valve block after the valve body and the valve block are installed into the shell.
② casing
The casing is the body of the device, installs valve body and valve block in the casing, plays the effect of protection valve body and valve block.
③ valve body
In this example, as shown in fig. 3(a), (B) and (C), projecting forceps are provided at the upper end of each valve body, and the valve bodies of the respective stages are connected by being gripped by the forceps. The lower end of each valve body is provided with a jaw clamp inlet corresponding to the valve body jaw for the next-stage valve body to be clamped in. A main orifice is arranged at the center of a disc at the bottom of the valve body and is a main channel for circulating drilling fluid; the edge of the bottom disk of the valve body is provided with a shunting hole, the size design and the hole distribution position of the shunting hole are designed according to the design method, and the shunting and throttling effects are mainly achieved.
In the measuring device shown in fig. 3, a primary orifice (e.g., a first primary orifice 503a distributed in the first valve body 503, a second primary orifice 505a distributed in the second valve body 505, and a third primary orifice 507a distributed in the third valve body 507 in fig. 1 or fig. 2) of the same size is formed at an intermediate position of each of the first valve body 503, the second valve body 505, and the third valve body 507. These primary orifi are capable of forming the primary channels for circulating drilling fluid.
In addition to the primary orifice, a secondary orifice (also called "splitter orifice") is disposed in each valve body, and the three splitter orifices are of different sizes, and are designed in detail according to the design method later. The auxiliary throttling hole can form an auxiliary channel for circulating drilling fluid, and the functions of shunting and throttling the drilling fluid are achieved. As shown in fig. 3, a flow dividing hole 503b distributed on the first valve body 503, a flow dividing hole 505b distributed on the second valve body 505, and a flow dividing hole 507b distributed on the third valve body 507.
Valve block
The shape and size of the valve block are 1/m: (
For engineering tolerances) the size of the bottom disk of the valve body, such as the fan shape of valve block c shown in fig. 4. When the valve block rotates to the lower side of the drilling tool under the action of gravity, the valve block can just block the shunt hole of the valve body, so that the effect of dynamically adjusting the bottom hole pressure drop is realized, and the dynamic state of the pressure of the ground vertical pipe is realizedAnd (4) changing.
In assembly, the third valve body 507 and the third valve block 508 are first placed in the housing 502, and then the second valve body 505 and the second valve block 506 are placed in the housing 502. When the second valve body 505 is attached, the center of the second auxiliary orifice 505b on the disk surface of the second valve body 505 is spaced 120 ° from the center of the third auxiliary orifice 507b of the third valve body 507 in the plan view. Subsequently, the first valve body 503 and the first valve block 504 are again installed, the first sub-orifice 503b of the first valve body 503 and the second sub-orifice 505b of the second valve body 505 are similarly spaced apart by 120 ° in a plan view, and finally the valve bodies are pressed by the upper joint 501.
After assembly, the first valve block 504 is movable within the cavity formed by the upper joint 501 and the first valve body 503, the second valve block 506 is movable within the cavity formed by the first valve body 503 and the second valve body 505, and the third valve block 508 is movable within the cavity formed by the second valve body 505 and the third valve body 507. The valve blocks can rotate to the lower side of the drilling tool under the action of gravity and just block the corresponding auxiliary throttling holes, so that the effect of dynamically adjusting the bottom hole pressure drop is realized, and the pressure of the surface riser is dynamically changed.
The following describes how the measurement device performs the measurement of the orientation tool face angle. When the tool face measurement is carried out, the measuring device is combined with other tools to form an ultrahigh temperature mechanical orientation tool face angle measuring system, and the system comprises: an orientation joint; the measuring device is arranged above the directional joint, and when the tool surface of the directional joint swings to different angles, the drilling fluid flowing through the measuring device is throttled to different degrees, so that different pressure drops are generated; the pressure monitoring device is arranged at the ground end and used for monitoring the pressure of the ground riser which changes along with the pressure drop change of the measuring device; and the directional tool face angle determining device is connected with the pressure monitoring device and determines the directional tool face angle of the drilling well according to the pressure of the ground riser based on the preset tool face angle-pressure relation. Wherein the preset toolface angle-pressure relationship may be obtained by: after the bottom hole assembly is installed at the wellhead, the drilling tool is rotated first, and wellhead pressure data conditions of the tool face at different angles are recorded (for example, the pressure of the measuring device is recorded in real time, and corresponding parameters such as pressure drop change and the like are calculated), so that a tool face angle-pressure relation is obtained. Therefore, in the construction process, the directional tool face angle determining device can distinguish the specific position of the underground tool face according to wellhead pressure data detected by the pressure monitoring device based on wellhead pressure conditions recorded on the ground, so that the real-time measurement of the tool face angle is realized.
During specific measurement, when the tool face of the directional joint swings to different angle positions, the pressure drop of the measuring device automatically changes along with the tool face, and accordingly the pressure of the ground vertical pipe changes along with the pressure. The pressure monitoring device arranged on the ground can determine the size of the underground tool face angle by monitoring the dynamic change of the pressure of the vertical pipe and transmitting the measured pressure of the vertical pipe on the ground to the directional tool face angle determining device. The core of the measurement is that the pressure drop dynamic change of the underground mechanical method adjusting device is triggered by the rotation of the drill column, so that the dynamic change of the wellhead pressure is driven, and the face angle of the underground directional tool is measured by dynamically monitoring the pressure change of the ground riser in real time.
The following describes in detail the implementation (principle) of the pressure drop variation of the measuring device.
The tool face angle of the measuring device ranges from 0 to 360 degrees, the measuring device is a disc when looking down, as shown in fig. 2 or fig. 4, at the moment, the disc when looking down can be divided into m parts, wherein m is 2n, then n parts are selected at intervals, the selected subareas are provided with shunting holes with different sizes, and each shunting hole corresponds to different pressure drops. When the tool face is placed in the directional drilling construction, the measuring device rotates along with the tool face, and at the moment, the measuring short section can be changed along with the change of the tool face angle by closing/opening different shunting holes. In particular, when well deviation exists in ultrahigh-temperature directional drilling construction, the diversion hole can be opened and closed by gravity in a mode of configuring a bias weight c (such as a disc valve).
In addition to the measuring device on which a plurality of valve bodies and valve blocks are arranged, a valve body and a valve block may also be arranged. In the measuring device having a plurality of valve bodies and valve blocks, a main orifice penetrates the center of each valve body, and one or more branch orifices may be provided in each valve body. When the valve body and the valve block are both one, the main throttling hole and all the branch flow holes are distributed in the bottom disc of the valve body.
How the measuring device is designed will be explained below.
A main orifice is first provided at the center of the bottom disk of the valve body.
Then, according to the precision requirement of the orientation of the drilled stratum, the number, the size and the hole distribution position of the shunt holes arranged at the bottom disc edge of the valve body are determined. This step is described in detail below.
(1) Method for designing number of shunting holes
And calculating the division number of the bottom disc of the valve body according to the specific construction precision requirement (the size of the engineering allowable error). Set up the engineering tolerance as
The number of parts that the disk needs to be divided can be calculated using the following equation:
in the formula: int denotes if
If not, rounding is performed.
Then, the number of the branch flow holes of the valve body is determined based on the calculated number of divided portions. If m is an odd number, m is equal to m +1, and if m is equal to 2n as described above, n is m/2, that is, the number of the diversion holes is n, which is shown in the following expression.
After the division number is determined, the measurement error of the device needs to be recalculated, and the following equation is specifically adopted for calculation:
(2) design of size and pressure drop of shunt hole
As mentioned above, the number of the diversion holes is n, and the allowed maximum riser pressure change value delta P is determined according to the ground construction equipment conditionmaxThen according to Δ PmaxAt 0. DELTA.PmaxTake j values of pressure drop Δ P therebetweeniThe j value is calculated using the following equation:
the simplest way to set the value of the pressure drop is to set the value of delta PmaxIs divided into j equal parts and then is divided into j equal parts,
subsequently to Δ PiThe size of the shunt hole under the pressure drop condition is designed, and the following equation is adopted to calculate the size of each pressure drop delta PiEquivalent cross-sectional area a of the shunt hole:
wherein c represents a flow coefficient, and the value of c is between 0.8 and 1; q represents a flow rate, m3S; ρ represents the fluid density, kg/m3。
(3) Implement method of tool surface measuring device
One of the key points of the tool face measuring device is the design of the tap hole, and the specific implementation method of the device is described above.
A. Method for arranging holes in sequence of shunting holes
As mentioned above, the disc is divided into m equal parts, n (m/2) parts are selected at intervals to arrange the shunting holes, the inner cylinder of the tool face testing device is viewed from top down (see through), the shunting holes are uniformly distributed on the whole disc, but the arrangement and control sequence is the premise that the tool face measuring device accurately measures the angles of the tool faces.
And (3) numbering the m equal parts divided by the disc respectively, wherein the numbers are 0, 1, 2, … and m-1, and holes are distributed at the positions with the numbers of 0, 2, … and m-2. The key point is the pressure drop setting of each hole, and the key point of the pressure drop setting is that the flow distribution hole at the ith position can be identified to be blocked in the tool face placing process in the ground monitoring process.
As described above, n number of the branch holes are arranged, if n is an even number, n/2 number of pressure drop values are set, that is, each pressure drop value corresponds to two holes, and if n is an odd number, the (n +1)/2 number of pressure drop values are arranged, that is, only one specific pressure drop value corresponds to one hole, and the rest corresponds to two holes. The simplest hole distribution mode is that from the position of number 0, the throttle area of the set shunt hole is gradually reduced, namely the throttle pressure drop is gradually increased and then gradually reduced after the throttle pressure drop is increased to the maximum value, so that the placing position of the tool face can be monitored when the tool face is placed and the drilling tool is rotated.
The hole placement sequence is not limited to the above method as long as it is possible to distinguish at the surface which orifice is plugged downhole. The specific hole distribution positions are shown in fig. 4.
B. Method for determining hole distribution position of flow distribution hole
The bottom disc of the valve body is divided into m sectors, and n subareas are selected from the m sectors at intervals to be respectively provided with the shunting holes. For each diversion hole, the shape of the diversion hole is not limited to a circle, a sector, an ellipse, a rectangular fillet (as shown in fig. 5) and the like, but it should be noted that the left and right ends of the diversion hole must be tangent to the boundary line of the sector obtained when the bottom disk of the valve body is divided into m blocks, and the center position of the hole is located on the middle line of the sector, as shown in fig. 5.
And finally, determining the shape and size of the valve block based on the shape of the bottom disc of the valve body and the number of the diversion holes, so that the valve block can completely shield the corresponding diversion holes when rotating in the shell due to the action of gravity. Specifically, when the number of the branch holes is determined, that is, the number of divisions of the bottom disk is also determined (m), the fan shape obtained when the bottom disk of the valve body is divided into m is determined as the size of the valve block. It is to be understood that the shape of the valve block described above is a preferred example, and not a limitation, as long as the valve block can completely cover each of the flow dividing holes provided in the valve body, and the area may be smaller than 1/m part of the disk area.
C. Specific implementation form of measuring device
After the bottom drilling tool assembly is installed at the wellhead, the drilling tool is rotated, and the pressure drop change conditions of the tool face at different angles are recorded (corresponding pressure drop changes are obtained in real time). The specific position of the underground tool face can be distinguished according to the change condition of the pressure drop recorded on the ground in the construction process, so that the real-time measurement of the tool face angle is realized.
The invention provides a device and a method for measuring a directional tool face of an ultra-high temperature horizontal well. When the device is installed during directional construction of the ultra-high temperature horizontal well, a related pressure drop change mode is recorded through ground test, and the specific numerical value of the underground tool face can be determined through the fluctuation change of the pressure of the ground vertical pipe in the underground tool face placing process, so that basic parameters can be provided for the directional construction of the ultra-high temperature horizontal well.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A design method of an ultrahigh-temperature mechanical orientation tool face measuring device, the measuring device is used for measuring a downhole orientation tool face angle in an ultrahigh-temperature environment and is provided with a shell, a valve body and a valve block which are installed in the shell, and an upper joint which compresses the valve body and the valve block in the shell, the design method comprises the following steps:
a main throttling hole is formed in the center of the bottom disc of the valve body;
determining the number, size and hole distribution positions of the diversion holes arranged at the bottom disc edge of the valve body according to the precision requirement of the orientation of the drilled stratum, wherein,
determining the number of the branch flow holes of the valve body through the following steps S1-S2:
s1, calculating the division number of the bottom disc of the valve body according to the allowable error of the specific construction engineering;
s2, determining the number of the diversion holes of the valve body based on the calculated divided parts;
determining the size of the diversion hole of the valve body through the following steps S3-S4:
s3, maximum allowable riser pressure variation value delta PmaxTaking a set number of j pressure drop values delta Pi；
S4, according to each pressure drop value delta PiCalculating an equivalent cross-sectional area a of the tap hole corresponding to the pressure drop, wherein,
determining the hole distribution position of the diversion hole of the valve body through the following steps S5-S6:
s5, dividing a bottom disc of the valve body into m sectors, and selecting n partitions from the m sectors at intervals to respectively arrange each shunt hole;
s6, aiming at the arrangement of each diversion hole, the left end and the right end of the diversion hole are tangent to a fan-shaped boundary line obtained when the bottom disc of the valve body is divided into m parts, and the center position of the diversion hole is positioned on the fan-shaped middle line;
the shape and size of the valve block are determined based on the shape of the bottom disk of the valve body and the number of the diversion holes, so that the corresponding diversion holes can be completely shielded when the valve block rotates in the housing due to the action of gravity.
2. The design method according to claim 1, wherein the number of the diversion holes is calculated according to the following expression:
wherein n represents the number of the shunting holes, m represents the division number of the bottom disk of the valve body,
wherein the content of the first and second substances,
and the size of the allowable error of the specific construction project is shown.
3. The design method according to claim 1,
the shape of the sector obtained when the bottom disk of the valve body is divided into m parts is determined as the size of the valve block.
4. An ultra-high temperature mechanical orientation tool face measurement device obtained by the design method according to any one of claims 1-3, which is used for measuring the downhole orientation tool face angle in an ultra-high temperature environment, and comprises:
a housing;
the valve body is arranged in the shell, a main throttling hole is formed in the center of a bottom disc of the valve body, and a plurality of shunting holes different in size are formed in the edge of the bottom disc;
at least one valve block arranged in the shell and used for completely shielding the corresponding diversion hole of the valve body when rotating in the shell under the action of the gravity of the valve block during the directional operation;
an upper fitting for compressing the valve body and valve block in the housing.
5. The ultra-high temperature mechanical orientation tool face measurement device of claim 4,
when the valve body and the valve block are multiple, the multiple valve bodies are connected in series and arranged in a cavity formed by the upper joint and the shell, the valve block is arranged in the cavity formed by the valve body and the cavity formed by the valve body and the upper joint, and the valve block can rotate circumferentially along the cavity where the valve block is located under the action of gravity.
6. The ultra-high temperature mechanical orientation tool face measurement device of claim 4,
when the valve body and the valve block are both one, the main throttling hole and all the branch flow holes are distributed in the bottom disc of the valve body.
7. An ultra-high temperature mechanical orientation tool face angle measurement system, the system comprising:
an orientation joint;
the ultra-high temperature mechanical directional tool face measuring device of any one of claims 4 to 6, which is mounted on the directional joint, and generates different pressure drops by throttling the drilling fluid flowing through the directional joint to different degrees when the tool face of the directional joint swings to different positions;
the pressure monitoring device is arranged at the ground end and used for monitoring the pressure of the ground riser, which changes along with the pressure drop change of the measuring device;
and the directional tool face angle determining device is connected with the pressure monitoring device and determines the directional tool face angle of the drilling well according to the pressure of the ground riser based on a preset tool face angle-pressure relation.
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| CN114427433B (en) * | 2020-09-15 | 2024-04-26 | 中国石油化工股份有限公司 | Underground tool face measuring tool based on mechanical pressure regulation |
| CN113756788B (en) * | 2021-10-18 | 2022-08-02 | 中国地质大学（北京） | Mechanical type is along with boring well deviation measuring apparatu |
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