CN111852366A - Accurate flow distribution method for rotary steering system downloading device - Google Patents
Accurate flow distribution method for rotary steering system downloading device Download PDFInfo
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- CN111852366A CN111852366A CN202010471801.1A CN202010471801A CN111852366A CN 111852366 A CN111852366 A CN 111852366A CN 202010471801 A CN202010471801 A CN 202010471801A CN 111852366 A CN111852366 A CN 111852366A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 239000002002 slurry Substances 0.000 claims description 22
- 238000000926 separation method Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 6
- 239000003208 petroleum Substances 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
-
- 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
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- 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)
- Earth Drilling (AREA)
Abstract
The invention discloses an accurate flow dividing method for a rotary steering system downloading device, which belongs to the technical field of petroleum drilling and is characterized by comprising the following steps of: a. calculating the pressure difference P before and after the drill hole by the formula 11(ii) a b. Calculating the extension loss delta P by the formula 2; c. calculating pressure P at rear riser of starting downloading device by formula 32(ii) a d. According to the pressure balance relation, the pressure drop of the throttle valve of the downloading device is also P2Calculating the throttle opening area S of the downloading device by equation 41(ii) a e. According to the opening degree and the opening area S of the throttle valve1And (3) adjusting the throttle valve to the calculated opening degree, so that the flow split automatically reaches the set flow split ratio, and the flow split is completed. The downloading device adopts an electric control design, and can realize remote control of the state of the valve by depending on an electric signalThe system is matched with an algorithm, so that the accurate flow dividing control of the throttle valve of the downloading device can be realized quickly, the adjusting precision is high, repeated adjustment is not needed, and the instruction downloading timeliness is improved.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to an accurate flow dividing method for a rotary steering system downloading device.
Background
The down-transmission device in the rotary steering system is a key component for realizing the underground control on the ground, and the realization principle is that the discharge capacity of mud entering a well is changed by shunting the drilling fluid in a vertical pipe with a certain proportion, and then a ground instruction is issued to a rotary steering tool at the bottom of the well. Since the tool is powered by a turbine generator, the mud displacement into the bottom of the well cannot be too small, which would affect the downhole power supply. Therefore, the shunt capacity of the downloading device needs to be accurately controlled, the current stage is mainly adjusted by experience, and the problems of long adjusting time and low precision exist, so that the instruction issuing timeliness is influenced.
Chinese patent publication No. CN 203603892U, publication No. 2014, 05 and 21 discloses a semi-automatic ground control device and a signal analysis system for a rotary steering system, which includes a ground control device and a signal analysis system, and is characterized in that: ground controlling means includes the riser, has drawn forth the reposition of redundant personnel pipeline on the riser, installs stop valve, ooff valve, flow control valve and flowmeter in order on the reposition of redundant personnel pipeline, and the stop valve is used for opening and close of reposition of redundant personnel pipeline, and the ooff valve is connected with pneumatic control mechanism, the last PLC controller that is connected with of pneumatic control mechanism is connected with the computer on the PLC controller, and the PLC controller is used for controlling pneumatic control mechanism's action, flow control valve is used for adjusting the flow size that passes through, signal analytic system is used for receiving and analyzing the negative pulse signal that the switching of ooff valve formed.
The semi-automatic ground control device and the signal analysis system of the rotary guide system disclosed in the patent document can continuously control the flow rate, and are suitable for fire-proof and explosion-proof severe environments without causing a blocking phenomenon. However, the problems of long adjusting time and low flow adjusting precision still exist, and the instruction issuing timeliness is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an accurate shunting method for a rotary guide system downloading device.
The invention is realized by the following technical scheme:
a method for accurate flow diversion of a rotary steerable system downloader, comprising the steps of:
a. setting the separation proportion of a downloading device as k, the equivalent area of a drill bit water hole as s, the total discharge capacity of a slurry pump as Q, the pressure of a vertical pipe before the downloading device is started as P, and calculating the pressure difference P between the front part and the rear part of the drill bit water hole by the formula 1 1；
p1＝Q2ρ/2μ2s2Formula 1
Wherein Q is the total discharge capacity of the slurry pump, m2S; mu is a flow coefficient, 0.63; s is the equivalent area of the drill hole, m2；P1The pressure difference before and after the drill water hole is expressed in unit Pa; rho is the density of the fluid, Kg/m3；
b. Calculating the extension loss delta P by the formula 2;
△P＝P-P1formula 2
c. Calculating pressure P at rear riser of starting downloading device by formula 32；
ρ2＝ΔP+ρ(1-k)2Q2/2μ2s2Formula 3
d. According to the pressure balance relation, the pressure drop of the throttle valve of the downloading device is also P2Calculating the throttle opening area S of the downloading device by equation 41；
e. According to the opening degree and the opening area S of the throttle valve1And (3) adjusting the throttle valve to the calculated opening degree, so that the flow split automatically reaches the set flow split ratio, and the flow split is completed.
In the step d, the pressure balance relation specifically means that a controllable throttle valve is opened at the position of the vertical pipe to divide the flow of the slurry, the front end of the throttle valve and the vertical pipe are in the same pressure system, the pressures at the two positions are the same and are the pressures of the vertical pipe, and the pressure of the vertical pipe is the sum of the pressure drop of a drill bit water eye and the circulating pressure loss.
In the step e, the throttle valve is adjusted to the calculated opening degree, specifically, the throttle valve is calibrated indoors to form a relation curve of the opening degree and the valve area, and the required opening degree of the valve is correspondingly obtained by combining the preset throttle valve area needing to be opened for the divided flow calculated in the preamble based on the relation curve of the valve opening degree and the valve area.
In the step e, the flow rate automatically reaches the set flow distribution ratio, specifically, the area of the throttle valve of the downloading device required to be opened is calculated according to a calculation formula after the downloading device receives the set flow distribution ratio, and then the area is usedThrottle opening and throttle opening area S1According to the relation, the required opening degree of the throttle valve is obtained, then the current signal is output according to the corresponding relation between the required opening degree of the throttle valve and the analog quantity electric signal, and the set shunting proportion is achieved through automatic adjustment of the throttle valve of the downloading device.
The basic principle of the invention is as follows:
a down-transmission device in the rotary steering system is a component for realizing ground control of the underground rotary steering tool, changes the discharge capacity of mud entering a well by shunting drilling fluid in a vertical pipe in a certain proportion, and further issues a ground instruction to the underground rotary steering tool. The front end of the throttle valve and the vertical pipe are the same pressure system, the pressures of the throttle valve and the vertical pipe are the same, based on the pressure balance, the flow and pressure relation, the separation proportion of the downloading device can be assumed to be k, the equivalent area of the drill bit water hole is s, the total discharge capacity of the mud pump is Q, the pressure of the vertical pipe before the downloading device is started is P, and the pressure difference P between the front part and the rear part of the drill bit water hole can be calculated 1Delta P, pressure P at the rear riser of the start-up downloader2And the opening area S of the throttle valve of the down-transfer device1Obtaining an accurate shunting algorithm of the downloading device; repeated adjustment is not needed, and the instruction downloading timeliness is improved.
The beneficial effects of the invention are mainly shown in the following aspects:
1. according to the invention, a, the separation proportion of a downloading device is set as k, the equivalent area of a drill water hole is set as s, the total discharge capacity of a slurry pump is set as Q, the pressure of a vertical pipe before the downloading device is started is set as P, and the pressure difference P between the front part and the rear part of the drill water hole is calculated by the formula 11(ii) a b. Calculating the extension loss delta P by the formula 2; c. calculating pressure P at rear riser of starting downloading device by formula 32(ii) a d. According to the pressure balance relation, the pressure drop of the throttle valve of the downloading device is also P2Calculating the throttle opening area S of the downloading device by equation 41(ii) a e. According to the opening degree and the opening area S of the throttle valve1The throttle valve is adjusted to the calculated opening degree, so that the flow split automatically reaches the set flow split proportion to complete flow splitThe proportion is k, the equivalent area of the drill hole is s, the total discharge capacity of the mud pump is Q, the pressure of the vertical pipe before the start of the down-transmission device is P, and the pressure difference P between the front part and the back part of the drill hole can be calculated 1Delta P, pressure P at the rear riser of the start-up downloader2And the opening area S of the throttle valve of the down-transfer device1Obtaining an accurate shunting algorithm of the downloading device; compared with the prior art, the downloading device adopts an electric control design, can rely on an electric signal to realize remote control of the valve state, is matched with an algorithm, can quickly realize accurate shunt control of the throttling valve of the downloading device, has high regulation precision, does not need to be repeatedly regulated, and improves the instruction downloading timeliness.
2. The pressure balance relation is that the flow of mud is divided by opening a controllable throttle valve at the vertical pipe, the front end of the throttle valve and the vertical pipe are in the same pressure system, the pressure at the two positions is the same and is the pressure of the vertical pipe, the pressure of the vertical pipe is the sum of the pressure drop of the water eye of the drill bit and the circulating pressure consumption, and the relation between the flow dividing quantity and the opening area of the throttle valve can be accurately obtained because the pressure drop of the water eye of the drill bit and the mud flow are in a corresponding relation.
3. Compared with the existing downloading device, the invention has the advantages that the operator needs to adjust according to the preset relationship between the flow distribution and the opening degree of the throttle valve, and the relationship between the flow distribution and the opening degree of the throttle valve is influenced by the characteristics of slurry media and various conditions of a drilling tool assembly, so that the set flow distribution ratio can be achieved by manual repeated adjustment.
Detailed Description
Example 1
A method for accurate flow diversion of a rotary steerable system downloader, comprising the steps of:
a. setting the separation proportion of a downloading device as k, the equivalent area of a drill bit water hole as s, the total discharge capacity of a slurry pump as Q, the pressure of a vertical pipe before the downloading device is started as P, and calculating the pressure difference P between the front part and the rear part of the drill bit water hole by the formula 11；
p1＝Q2ρ/2μ2s2Formula 1
Wherein Q is the total discharge capacity of the slurry pump, m2S; mu is a flow coefficient, 0.63; s is the equivalent area of the drill hole, m2；P1The pressure difference before and after the drill water hole is expressed in unit Pa; rho is the density of the fluid, Kg/m3；
b. Calculating the extension loss delta P by the formula 2;
△P＝P-P1formula 2
c. Calculating pressure P at rear riser of starting downloading device by formula 32；
p2＝ΔP+ρ(1-k)2Q2/2μ2s2Formula 3
d. According to the pressure balance relation, the pressure drop of the throttle valve of the downloading device is also P2Calculating the throttle opening area S of the downloading device by equation 41；
e. According to the opening degree and the opening area S of the throttle valve1And (3) adjusting the throttle valve to the calculated opening degree, so that the flow split automatically reaches the set flow split ratio, and the flow split is completed.
A, setting the separation proportion of a downloading device as k, the equivalent area of a drill bit water hole as s, the total discharge capacity of a slurry pump as Q, the pressure of a vertical pipe before the downloading device is started as P, and calculating the pressure difference P between the front part and the rear part of the drill bit water hole by the formula 1 1(ii) a b. Calculating the extension loss delta P by the formula 2; c. calculating pressure P at rear riser of starting downloading device by formula 32(ii) a d. According to the pressure balance relation, the pressure drop of the throttle valve of the downloading device is also P2Calculating the throttle opening area S of the downloading device by equation 41(ii) a e. According to the opening degree and the opening area S of the throttle valve1The throttle valve is adjusted to the calculated opening degree, so that the flow split automatically reaches the set flow split ratio to complete flow splitFor example, k, the equivalent area of the drill hole is s, the total discharge capacity of the slurry pump is Q, the pressure of the vertical pipe before the start of the down-transfer device is P, and the pressure difference P between the front and the back of the drill hole can be calculated1Delta P, pressure P at the rear riser of the start-up downloader2And the opening area S of the throttle valve of the down-transfer device1Obtaining an accurate shunting algorithm of the downloading device; compared with the prior art, the downloading device adopts an electric control design, can rely on an electric signal to realize remote control of the valve state, is matched with an algorithm, can quickly realize accurate shunt control of the throttling valve of the downloading device, has high regulation precision, does not need to be repeatedly regulated, and improves the instruction downloading timeliness.
Example 2
A method for accurate flow diversion of a rotary steerable system downloader, comprising the steps of:
a. setting the separation proportion of a downloading device as k, the equivalent area of a drill bit water hole as s, the total discharge capacity of a slurry pump as Q, the pressure of a vertical pipe before the downloading device is started as P, and calculating the pressure difference P between the front part and the rear part of the drill bit water hole by the formula 11；
p1＝Q2ρ/2μ2s2Formula 1
Wherein Q is the total discharge capacity of the slurry pump, m2S; mu is a flow coefficient, 0.63; s is the equivalent area of the drill hole, m2；P1The pressure difference before and after the drill water hole is expressed in unit Pa; rho is the density of the fluid, Kg/m3；
b. Calculating the extension loss delta P by the formula 2;
△P＝P-P1formula 2
c. Calculating pressure P at rear riser of starting downloading device by formula 32；
p2＝ΔP+ρ(1-k)2Q2/2μ2s2Formula 3
d. According to the pressure balance relation, the pressure drop of the throttle valve of the downloading device is also P2Calculating the throttle opening area S of the downloading device by equation 41；
e. According to the opening degree and the opening area S of the throttle valve1And (3) adjusting the throttle valve to the calculated opening degree, so that the flow split automatically reaches the set flow split ratio, and the flow split is completed.
In the step d, the pressure balance relation specifically means that a controllable throttle valve is opened at the position of the vertical pipe to divide the flow of the slurry, the front end of the throttle valve and the vertical pipe are in the same pressure system, the pressures at the two positions are the same and are the pressures of the vertical pipe, and the pressure of the vertical pipe is the sum of the pressure drop of a drill bit water eye and the circulating pressure loss.
The pressure balance relation is that a controllable throttle valve is opened at a vertical pipe to shunt the mud flow, the front end of the throttle valve and the vertical pipe are in the same pressure system, the pressures at the two positions are the same and are the vertical pipe pressure, the vertical pipe pressure is the sum of the drill bit water eye pressure drop and the circulating pressure loss, and the drill bit water eye pressure drop and the mud flow form a corresponding relation, so that the relation between the shunt flow and the throttle valve opening area can be accurately obtained.
Example 3
A method for accurate flow diversion of a rotary steerable system downloader, comprising the steps of:
a. setting the separation proportion of a downloading device as k, the equivalent area of a drill bit water hole as s, the total discharge capacity of a slurry pump as Q, the pressure of a vertical pipe before the downloading device is started as P, and calculating the pressure difference P between the front part and the rear part of the drill bit water hole by the formula 11；
p1＝Q2ρ/2μ2s2Formula 1
Wherein Q is the total discharge capacity of the slurry pump, m2S; mu is a flow coefficient, 0.63; s is the equivalent area of the drill hole, m2；P1The pressure difference before and after the drill water hole is expressed in unit Pa; rho is the density of the fluid, Kg/m3；
b. Calculating the extension loss delta P by the formula 2;
△P＝P-P1formula 2
c. Calculating pressure P at rear riser of starting downloading device by formula 32；
p2＝ΔP+ρ(1-k)2Q2/2μ2s2Formula 3
d. According to the pressure balance relation, the pressure drop of the throttle valve of the downloading device is also P2Calculating the throttle opening area S of the downloading device by equation 4 1；
e. According to the opening degree and the opening area S of the throttle valve1And (3) adjusting the throttle valve to the calculated opening degree, so that the flow split automatically reaches the set flow split ratio, and the flow split is completed.
In the step d, the pressure balance relation specifically means that a controllable throttle valve is opened at the position of the vertical pipe to divide the flow of the slurry, the front end of the throttle valve and the vertical pipe are in the same pressure system, the pressures at the two positions are the same and are the pressures of the vertical pipe, and the pressure of the vertical pipe is the sum of the pressure drop of a drill bit water eye and the circulating pressure loss.
In the step e, the throttle valve is adjusted to the calculated opening degree, specifically, the throttle valve is calibrated indoors to form a relation curve of the opening degree and the valve area, and the required opening degree of the valve is correspondingly obtained by combining the preset throttle valve area needing to be opened for the divided flow calculated in the preamble based on the relation curve of the valve opening degree and the valve area.
Example 4
A method for accurate flow diversion of a rotary steerable system downloader, comprising the steps of:
a. setting the separation proportion of a downloading device as k, the equivalent area of a drill bit water hole as s, the total discharge capacity of a slurry pump as Q, the pressure of a vertical pipe before the downloading device is started as P, and calculating the pressure difference P between the front part and the rear part of the drill bit water hole by the formula 11；
p1＝Q2ρ/2μ2s2Formula 1
Wherein Q is the total discharge capacity of the slurry pump, m 2S; mu is a flow coefficient, 0.63; s is the equivalent area of the drill hole, m2；P1The pressure difference before and after the drill water hole is expressed in unit Pa; rho is the density of the fluid, Kg/m3；
b. Calculating the extension loss delta P by the formula 2;
△P＝P-P1formula 2
c. Calculating pressure P at rear riser of starting downloading device by formula 32；
p2＝ΔP+ρ(1-k)2Q2/2μ2s2Formula 3
d. According to the pressure balance relation, the pressure drop of the throttle valve of the downloading device is also P2Calculating the throttle opening area S of the downloading device by equation 41；
e. According to the opening degree and the opening area S of the throttle valve1And (3) adjusting the throttle valve to the calculated opening degree, so that the flow split automatically reaches the set flow split ratio, and the flow split is completed.
In the step d, the pressure balance relation specifically means that a controllable throttle valve is opened at the position of the vertical pipe to divide the flow of the slurry, the front end of the throttle valve and the vertical pipe are in the same pressure system, the pressures at the two positions are the same and are the pressures of the vertical pipe, and the pressure of the vertical pipe is the sum of the pressure drop of a drill bit water eye and the circulating pressure loss.
In the step e, the throttle valve is adjusted to the calculated opening degree, specifically, the throttle valve is calibrated indoors to form a relation curve of the opening degree and the valve area, and the required opening degree of the valve is correspondingly obtained by combining the preset throttle valve area needing to be opened for the divided flow calculated in the preamble based on the relation curve of the valve opening degree and the valve area.
In the step e, the flow rate automatically reaches the set flow rate, specifically, after the downloading device receives the set flow rate, the area of the downloading device throttle valve to be opened is calculated according to the calculation formula, and then the area S of the downloading device throttle valve to be opened is calculated according to the opening degree of the throttle valve and the opening area S of the throttle valve1According to the relation, the required opening degree of the throttle valve is obtained, then the current signal is output according to the corresponding relation between the required opening degree of the throttle valve and the analog quantity electric signal, and the set shunting proportion is achieved through automatic adjustment of the throttle valve of the downloading device.
Compared with the existing downloading device, an operator needs to adjust according to the preset relation between the flow split and the opening degree of the throttle valve, and the relation between the flow split and the opening degree of the throttle valve is influenced by the characteristics of slurry media and various conditions of a drilling tool assembly, so that the set flow split ratio can be achieved by manual repeated adjustment.
Claims (4)
1. A method for accurate flow diversion of a rotary steerable system downloader, comprising the steps of:
a. setting the separation proportion of a downloading device as k, the equivalent area of a drill bit water hole as s, the total discharge capacity of a slurry pump as Q, the pressure of a vertical pipe before the downloading device is started as P, and calculating the pressure difference P between the front part and the rear part of the drill bit water hole by the formula 1 1；
p1＝Q2ρ/2μ2s2Formula 1
Wherein Q is the total discharge capacity of the slurry pump, m2S; mu is a flow coefficient, 0.63; s is the equivalent area of the drill hole, m2；P1The pressure difference before and after the drill water hole is expressed in unit Pa; rho is the density of the fluid, Kg/m3；
b. Calculating the extension loss delta P by the formula 2;
△P＝P-P1formula 2
c. Calculating pressure P at rear riser of starting downloading device by formula 32；
p2＝ΔP+ρ(1-k)2Q2/2μ2s2Formula 3
d. According to the pressure balance relation, the pressure drop of the throttle valve of the downloading device is also P2Calculating the throttle opening area S of the downloading device by equation 41；
e. According to the opening degree and the throttling of the throttling valveValve opening area S1And (3) adjusting the throttle valve to the calculated opening degree, so that the flow split automatically reaches the set flow split ratio, and the flow split is completed.
2. A method of accurately diverting flow for a rotary steerable system downloader according to claim 1, wherein: in the step d, the pressure balance relation specifically means that a controllable throttle valve is opened at the position of the vertical pipe to divide the flow of the slurry, the front end of the throttle valve and the vertical pipe are in the same pressure system, the pressures at the two positions are the same and are the pressures of the vertical pipe, and the pressure of the vertical pipe is the sum of the pressure drop of a drill bit water eye and the circulating pressure loss.
3. A method of accurately diverting flow for a rotary steerable system downloader according to claim 1, wherein: in the step e, the throttle valve is adjusted to the calculated opening degree, specifically, the throttle valve is calibrated indoors to form a relation curve of the opening degree and the valve area, and the required opening degree of the valve is correspondingly obtained by combining the preset throttle valve area needing to be opened for the divided flow calculated in the preamble based on the relation curve of the valve opening degree and the valve area.
4. A method of accurately diverting flow for a rotary steerable system downloader according to claim 1, wherein: in the step e, the flow rate automatically reaches the set flow rate, specifically, after the downloading device receives the set flow rate, the area of the downloading device throttle valve to be opened is calculated according to the calculation formula, and then the area S of the downloading device throttle valve to be opened is calculated according to the opening degree of the throttle valve and the opening area S of the throttle valve1According to the relation, the required opening degree of the throttle valve is obtained, then the current signal is output according to the corresponding relation between the required opening degree of the throttle valve and the analog quantity electric signal, and the set shunting proportion is achieved through automatic adjustment of the throttle valve of the downloading device.
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