CN112035975A - Oil and gas pipeline directional drilling back-dragging design method - Google Patents

Oil and gas pipeline directional drilling back-dragging design method Download PDF

Info

Publication number
CN112035975A
CN112035975A CN202010889399.9A CN202010889399A CN112035975A CN 112035975 A CN112035975 A CN 112035975A CN 202010889399 A CN202010889399 A CN 202010889399A CN 112035975 A CN112035975 A CN 112035975A
Authority
CN
China
Prior art keywords
back curve
cat
dragging
curve
cat back
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010889399.9A
Other languages
Chinese (zh)
Inventor
左雷彬
杨威
杨春玲
詹胜文
李国辉
马晓成
王丽
苏卫锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Petroleum Corp
China Petroleum Pipeline Engineering Corp
Original Assignee
China National Petroleum Corp
China Petroleum Pipeline Engineering Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China National Petroleum Corp, China Petroleum Pipeline Engineering Corp filed Critical China National Petroleum Corp
Priority to CN202010889399.9A priority Critical patent/CN112035975A/en
Publication of CN112035975A publication Critical patent/CN112035975A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/06—Accessories therefor, e.g. anchors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/14—Pipes

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Pure & Applied Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computational Mathematics (AREA)
  • Earth Drilling (AREA)

Abstract

The invention discloses a directional drilling back-dragging design method for an oil and gas pipeline, which comprises the following steps: determining the curvature radius of a cat back curve according to the directional drilling axis and the pipe of the back dragging pipeline; determining a sending form of the pipeline back dragging according to the topographic conditions of the pipeline back dragging construction site, and calculating the excavation depth of an excavation area and the length of the excavation area; determining a starting point of a cat back curve and calculating corresponding coordinates of a plurality of characteristic points on the cat back curve; drawing a cat back curve through drawing software according to the corresponding coordinates of the starting point and the plurality of characteristic points; determining the unearthed angle of the back-dragging pipeline and the span between adjacent hoisting points of the cat back curve according to the pipe diameter of the back-dragging pipeline through the oil and gas pipeline engineering horizontal directional drilling crossing design specification, and calculating the number of the hoisting points of the cat back curve; and obtaining an arrangement scheme of the cat back curve support according to the drawn cat back curve, the span between the adjacent hoisting points, the number of the hoisting points and the arrangement mode of the hoisting points to finish the directional drilling back-dragging design of the oil and gas pipeline.

Description

Oil and gas pipeline directional drilling back-dragging design method
Technical Field
The invention relates to the technical field of oil and gas pipeline directional drilling crossing engineering design, in particular to a directional drilling back-dragging design method for an oil and gas pipeline.
Background
In recent years, directional drilling and crossing are more and more widely applied to the field of oil and gas pipelines due to the advantages of environmental protection, safety, short construction period, low cost and the like. The directional drilling and crossing of the oil and gas pipeline is generally divided into 3 stages according to the construction process: pilot hole, reaming and back dragging. The back dragging is the last stage of the directional drilling construction and is the most critical step in the directional drilling construction.
Along with the increasing of the pipe diameter of the oil and gas pipeline, the cat back curve arrangement when the back dragging pipeline enters the drill hole is lengthened, and the number of hoisting points is increased. In the conventional method, two cranes are usually hired at the site and lifted by a trencher or a pipelayer, so that the cat back curve of the back towing pipeline is arranged. But for the pipeline with the pipe diameter larger than 1219mm, the ditcher cannot meet the requirement, and the number of hoisting points arranged on the cat back is increased along with the lengthening of the cat back curve. Leasing ten or more cranes at a time is difficult and expensive. At present, the cat back curve arrangement construction mainly adopts two kinds of modes to realize when the pipeline is dragged back: firstly, hoisting a steel pipe through a pipe crane (crane), and forming a cat back curve by controlling the elevation of a hoisting point; and secondly, excavating the unearthed end, and excavating a sending ditch by putting a slope according to the trend of the cat back curve to form the cat back curve before the steel pipe enters the tunnel. However, both of the above two methods have disadvantages: the problem of constructing the cat back curve of the pipe crane (crane) is that when the pipe diameter is larger or the soil emergence angle is larger, the cat back curve is longer, the number of hoisting points is increased, so that a plurality of pipe cranes (cranes) need to be rented at the same time, the rented resources are limited, the rented cost is high, and certain requirements are also met for roads entering a construction site; the problem of the cat back curve of the excavation structure of the unearthed end is that the environment is greatly influenced by excavation, excavation measures such as dewatering and slope releasing are also considered when the excavation depth is large, and in addition, as the ditch bottom is a slope, a sending ditch is difficult to construct, and the cost is high due to the long construction period of excavation and recovery.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a directional drilling back-dragging design method for an oil and gas pipeline.
The invention provides a directional drilling back-dragging design method for an oil and gas pipeline, which comprises the following steps:
step 1, determining the curvature radius of a cat back curve according to the directional drilling axis and a pipe of a back dragging pipeline;
step 2, determining a sending form of the pipeline back dragging according to the topographic conditions of the pipeline back dragging construction site, and calculating the excavation depth of the excavation area and the length of the excavation area according to the sending form;
step 3, determining a starting point of the cat back curve and calculating corresponding coordinates of a plurality of characteristic points on the cat back curve;
step 4, drawing a cat back curve through drawing software according to the corresponding coordinates of the starting point and the plurality of characteristic points in the step 3;
step 5, determining the unearthed angle of the towing pipeline and the span between adjacent hoisting points of the cat back curve according to the pipe diameter of the towing pipeline, and calculating the number of the hoisting points of the cat back curve;
and 6, obtaining an arrangement scheme of the cat back curve support according to the drawn cat back curve, the span between the adjacent hoisting points in the step 5, the number of the hoisting points and the arrangement mode of the hoisting points, and finishing the directional drilling back dragging design of the oil and gas pipeline.
As a further improvement of the invention, the specific calculation formula of the curvature radius of the cat back curve in the step 1 is as follows:
Rc≥Rmin
Rmin＝ED/(2Fb)
wherein R iscRadius of curvature of cat back curve, RminIs the minimum radius of curvature of the cat back curve, E is the modulus of elasticity of the dragline pipe, D is the outside diameter of the dragline pipe, FbTo pull back the bending stress of the pipe.
As a further improvement of the invention, the sending mode of the pipeline back dragging in the step 2 comprises sending ditch and roller carrier, and when the terrain of the unearthed end is flat and no sundries are on the ground or underground, the sending mode of the channel is selected; when the terrain of the unearthed end is complex or the soil quality is poor, a roller frame sending mode is selected.
As a further improvement of the invention, the calculation formula of the excavation depth of the excavation area is as follows:
Ht≤Ht max
Ht max＝min{Ht max1,Ht max2}
Ht max1＝Ldsinα
Ht max2＝Rc-Hr-Hb
Hr＝Rccosα
when transmitting for the transmit channel:
Figure BDA0002656471970000021
when sending for the roller frame:
Figure BDA0002656471970000022
wherein HtFor the excavation depth of the excavation zone, Ht max1Maximum excavation depth, H, for length control of the straight pipe segments at the unearthed endt max2Maximum excavation depth for single-arc curve control of unearthed end, Ht maxTo a maximum excavation depth, LdIs the length of the soil end straight pipe section, alpha is the soil emergence angle, RcRadius of curvature of the cat back curve, HrIs the product of the curvature radius of the cat back curve and the cosine value of the unearthed angle, HbThe distance from the center of the back dragging pipeline to the ground, D is the outer diameter of the back dragging pipeline, Hd1For the distance from the top of the pipe to the ground, Hd2The distance from the bottom of the tube to the ground is sent to the roller frame.
As a further improvement of the invention, the calculation formula of the excavation length of the excavation area is as follows:
when R isc＞Hr+HtWhen the temperature of the water is higher than the set temperature,
Figure BDA0002656471970000031
when R isc＜Hr+HtI.e. when the cat back curve is all below the ground, Lt＝L1；
When R isc＝Hr+HtI.e. when the arch of the cat back curve is level on the ground, Lt＝L1；
L1＝Rcsinα；
Wherein HtTo an excavation depth, LtFor excavation length, L1The horizontal length from the beginning of the cat back curve to the segment of the dome.
As a further improvement of the invention, the starting point of the cat back curve determined in step 4 is A (X)A,YA) The other points are B (X)B,YB)、C(XC,YC)、M(XM,YM)、N(XN,YN)、E(XE,YE)、F(XF,YF) And the calculation formula of the coordinates of other points is as follows:
XB＝(L1+L2-L2/2)/Nx*1000+XA
Figure BDA0002656471970000032
XC＝(L1+L2)/Nx*1000+XA
YC＝(Hb+Ht)/Ny*1000+YA；
XM＝L1/Nx*1000+XA
YM＝(Hc+Ht)/Ny*1000+YA；
Figure BDA0002656471970000033
Figure BDA0002656471970000034
XE＝-10
YE＝Ht/Ny*1000；
XF＝(L1+L2)/Ny*1000+10
YF＝Ht/Ny*1000。
wherein L is1The horizontal length from the beginning of the cat back curve to the arch top section, L2The horizontal length from the vault of the cat back curve to the terminal section, NxFor transverse scaling, NyTo scale longitudinally, HcThe arch height of the overground part of the cat back curve is shown, and beta is the circle center corner corresponding to the section from the arch top of the cat back curve to the back curve point.
As a further improvement of the invention, the arrangement mode of the suspension points in the step 5 comprises a central arrangement and a sequential arrangement, wherein the central arrangement is that the suspension points are arranged in an equal span from the highest point of the arch of the cat back curve to two sides until the span is not satisfied; the lifting points are sequentially arranged at equal intervals from the initial point of the cat back curve according to the span until the span is not satisfied.
As a further improvement of the invention, the calculation formula of the number of the suspension points of the cat back curve is as follows:
when the suspension points are arranged in sequence:
Figure BDA0002656471970000041
when the suspension point arrangement mode is the central arrangement: n is n1+n2
Figure BDA0002656471970000042
Figure BDA0002656471970000043
Wherein n is the number of suspension points, n1Number of hanging points of front section of arch of cat back curve, n2The number of suspension points at the rear section of the arch of the cat back curve, the length of the cat back curve, LsDistance L from the first hanging point on the cat back curve to the starting point of the cat back curve0Span of adjacent suspension points on the cat back curve, L1The horizontal length from the beginning of the cat back curve to the arch top section, the length of the excavated area, L2The horizontal length from the vault to the terminal section of the cat back curve, LbThe horizontal length of the cat back curve into the sending trough section.
As a further improvement of the present invention, in step 6, the cat back curve support comprises:
the rolling support is connected with the top of the upright post steel pipe through channel steel;
the top flange is arranged between the channel steel and the upright post steel pipe and is connected with the anchor boxes through steel wire ropes, the anchor boxes are buried underground, and the steel wire ropes and the anchor boxes are matched and are provided with a plurality of steel wire ropes;
and the shear key is arranged at the bottom end of the upright post steel pipe and is embedded underground.
As a further improvement of the invention, the rolling support is connected with the channel steel through bolts, and the channel steel is welded and connected with the top of the upright post steel pipe; and a bottom flange is arranged between the bottom end of the upright post steel pipe and the shear key.
The invention has the beneficial effects that: the cat back curve support is arranged by drawing the cat back curve, the traditional method that a crane is used for lifting the back dragging pipeline is replaced, and the calculation of the curvature radius of the cat back curve and the drawing of the cat back curve are rapid and convenient; the cat back support has the advantages of simple and convenient construction, installation and disassembly, no influence on the environment, reusability, wind resistance, horizontal force bearing, adjustable height, adaptability to different pipe diameters and the like; the design of the cat back of the large-diameter directional drill back-dragging pipeline fills the blank, the technical guarantee is provided for the smooth implementation of the large-diameter directional drill back-dragging pipeline, and the technical basis is provided for the refinement and standardization of the back-dragging pipeline design.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a flow chart of a design method for directional drilling back-dragging of an oil and gas pipeline according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a cat back curve support in the design method for directional drilling and back-dragging of an oil and gas pipeline according to the embodiment of the invention;
fig. 3 is a cat back curve drawn when the sending form is roller frame sending in the oil and gas pipeline directional drilling back-dragging design method according to the embodiment of the invention;
fig. 4 is a cat back curve drawn when the sending form is sending in a sending ditch in the oil and gas pipeline directional drilling back-dragging design method according to the embodiment of the invention.
In the figure, the position of the upper end of the main shaft,
1. rolling the support; 2. channel steel; 3. a top flange; 4. a column steel pipe; 5. a bottom flange; 6. a shear key; 7. a wire rope; 8. an anchor box.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, in the description of the present invention, the terms used are for illustrative purposes only and are not intended to limit the scope of the present invention. The terms "comprises" and/or "comprising" are used to specify the presence of stated elements, steps, operations, and/or components, but do not preclude the presence or addition of one or more other elements, steps, operations, and/or components. The terms "first," "second," and the like may be used to describe various elements, not necessarily order, and not necessarily limit the elements. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. These terms are only used to distinguish one element from another. These and/or other aspects will become apparent to those of ordinary skill in the art in view of the following drawings, and the description of the embodiments of the present invention will be more readily understood by those of ordinary skill in the art. The drawings are only for purposes of illustrating the described embodiments of the invention. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated in the present application may be employed without departing from the principles described in the present application.
As shown in fig. 1, a design method for directional drilling and back-dragging of an oil and gas pipeline according to an embodiment of the present invention includes:
step 1, determining the curvature radius of a cat back curve according to the directional drilling axis and a pipe of a back dragging pipeline;
step 2, determining a sending form of the pipeline back dragging according to the topographic conditions of the pipeline back dragging construction site, and calculating the excavation depth of the excavation area and the length of the excavation area according to the sending form;
step 3, determining a starting point of the cat back curve and calculating corresponding coordinates of a plurality of characteristic points on the cat back curve;
step 4, drawing a cat back curve through drawing software according to the corresponding coordinates of the starting point and the plurality of characteristic points in the step 3;
step 5, determining the unearthed angle of the back-dragging pipeline and the span between adjacent hoisting points of the cat back curve according to the pipe diameter of the back-dragging pipeline through the design specification of horizontal directional drilling and crossing of oil and gas pipeline engineering, and calculating the number of the hoisting points of the cat back curve;
and 6, obtaining an arrangement scheme of the cat back curve support according to the drawn cat back curve, the span between the adjacent hoisting points in the step 5, the number of the hoisting points and the arrangement mode of the hoisting points, and finishing the directional drilling back dragging design of the oil and gas pipeline.
The main factor influencing the span is the pipe diameter, and the span corresponding to the pipe diameter can be found out in the design specification after the pipe diameter is determined. In the embodiment, drawing software develops a drawing program based on AutoCAD, and the drawing proportion is that the transverse proportion is 1: n is a radical ofxThe longitudinal proportion is 1: n is a radical ofyDrawing a hoisting curve (three-point arc) and a ground line by using a PLINE command in CAD, inserting hoisting point symbols into corresponding positions of the curve by using the hoisting point arrangement data calculated by installing the hoisting curve, marking relevant sizes, and drawing a hoisting seat curve as shown in figures 3-4.
Further, the specific calculation formula of the curvature radius of the cat back curve in the step 1 is as follows:
Rc≥Rmin
Rmin＝ED/(2Fb)
wherein R iscRadius of curvature of cat back curve, RminIs the minimum radius of curvature of the cat back curve, E is the modulus of elasticity of the dragline pipe, D is the outside diameter of the dragline pipe, FbTo pull back the bending stress of the pipe.
There is no clear calculation method for the minimum curvature radius of the cat back curve in China, but a calculation formula of the minimum curvature radius can be deduced according to a calculation formula of the maximum allowable bending stress. The maximum allowable bending stress calculation formula of the directional drilling back-dragging pipeline considers the influences of the radius-thickness ratio and the yield strength of the back-dragging pipeline, and the maximum allowable bending stress calculation formula is as follows:
Fb＝0.75Fy,D/t≤500000/Fy
Fb＝(0.84-(1.74FyD)/(Et))Fy,1500000/Fy＜D/t≤3000000/Fy
Fb＝(0.72-(0.58FyD)/(Et))Fy,3000000＜D/t≤300000
wherein, FbMaximum allowable bending stress for the back-haul pipe, FyThe minimum yield strength is specified for the back dragging pipeline, D is the outer diameter of the back dragging pipeline, and t is the wall thickness of the back dragging pipeline.
According to the regulation in the oil and gas transmission pipeline engineering horizontal directional drilling crossing design specification sy/t6968 of the directional drilling industry standard, the diameter-thickness ratio of the directional drilling pipeline should not exceed 80. According to the maximum allowable bending stress calculation formula of the back dragging pipeline, the maximum allowable bending stress coefficients of 0.75, 0.66 or 0.58 corresponding to the maximum allowable bending stress under three conditions are substituted into the respective maximum allowable bending stress calculation formulas, and then the minimum curvature radius calculation formula of the cat back curve can be deduced. Selecting a calculation formula of the maximum allowable bending stress according to the pipe diameter, the wall thickness and the material of the back dragging pipeline, calculating the maximum allowable bending stress, determining the elastic modulus of the back dragging pipeline according to the material of the back dragging pipeline, and calculating the minimum curvature radius according to the calculation formula of the minimum curvature radius. The curvature radius of the cat back curve is designed to be larger than the minimum curvature radius of the cat back curve, the curvature radius is determined according to the pipe diameter of the selected back dragging pipeline, and the curvature radius of the cat back curve is properly reduced when the pipe diameter is larger.
Further, the sending mode of the pipeline back dragging in the step 2 comprises sending by a sending ditch and sending by a roller frame, and when the terrain of the unearthed end is flat and no sundries exist on the ground or underground, the sending mode by the sending ditch is selected; when the terrain of the unearthed end is complex or the soil quality is poor, a roller frame sending mode is selected.
When the unearthed point and the curvature radius are large, the height of the lifting point is very high, a certain depth of excavation on one side of the unearthed end can be considered, the height of the ditch bottom meets the requirement of curve arrangement, and the number of the lifting points is reduced at the same time by the lower highest point lifting height. Two common delivery methods are currently used, namely delivery trench delivery and roller carriage delivery.
When the soil outlet end of the back-dragging pipeline is in a relatively flat terrain and the soil is silt, silty clay, sandy silt and other geological conditions, a delivery mode of excavating delivery ditches is generally adopted under the conditions that no obstacles exist on the ground and underground and water taking is convenient. The specific construction method comprises the following steps: and prefabricating a through support pipeline at a preset position of the through unearthing end, and determining the depth and the width of the excavated pipe trench according to the terrain, the unearthing angle and the like. In general, the width of the lower bottom of the sending ditch is 500mm larger than the pipe diameter of the back dragging pipe; then a certain amount of water is injected into the sending ditch, and the minimum water injection depth in the pipe ditch is preferably more than 1/3 of the pipe diameter; the horizontal and longitudinal curvature radius of the sending channel should meet the requirement of passing through the elastic laying of the pipeline, and the curvature radius should be more than or equal to 1500D under the normal condition, wherein D is the outer diameter of the back dragging pipeline.
When the soil outlet end of the back dragging pipeline is complex in terrain (hills and finished product fields) or poor in soil quality (more broken bricks and broken stones), the roller frame type large Song can be adopted under the condition that ditch sending is not suitable. The specific construction method comprises the following steps: a steel frame double-rubber roller sending frame is used as a sending channel, a roller frame body is made of channel steel according to the diameter of the sending channel, a roller support is made of round steel with a proper diameter, and a special hollow rubber ring is sleeved on the round steel. The arrangement of the sending frame during back dragging is required to be arranged according to the factors such as the outer diameter of the pipeline, the unit weight of the pipeline, the height of the pipe position and the like. The sending form is suitable for more complicated terrain conditions, can better meet the longitudinal curvature of the pipeline and prevent the pipeline anticorrosive coating from being damaged when the pipeline is dragged back, simultaneously reduces the friction of the pipeline, and reduces the drag back resistance to be beneficial to the drag back of the pipeline. The roller frame has large one-time investment cost, but can be repeatedly used for many times.
Further, the calculation formula of the excavation depth of the excavation area is as follows:
Ht≤Ht max
Ht max＝min{Ht max1,Ht max2}
Ht max1＝Ld sinα
Ht max2＝Rc-Hr-Hb
Hr＝Rc cosα
when transmitting for the transmit channel:
Figure BDA0002656471970000091
when sending for the roller frame:
Figure BDA0002656471970000092
wherein HtFor the excavation depth of the excavation zone, Ht max1Maximum excavation depth, H, for length control of the straight pipe segments at the unearthed endt max2Maximum excavation depth for single-arc curve control of unearthed end, Ht maxTo a maximum excavation depth, LdIs the length of the soil end straight pipe section, alpha is the soil emergence angle, RcRadius of curvature of the cat back curve, HrIs the product of the curvature radius of the cat back curve and the cosine value of the unearthed angle, HbThe distance from the center of the back dragging pipeline to the ground, D is the outer diameter of the back dragging pipeline, Hd1For the distance from the top of the pipe to the ground, Hd2The distance from the bottom of the tube to the ground is sent to the roller frame.
Further, a concrete calculation formula of the excavation length of the excavation area is as follows:
when R isc＞Hr+HtWhen the temperature of the water is higher than the set temperature,
Figure BDA0002656471970000093
when R isc＜Hr+HtI.e. when the cat back curve is all below the ground, Lt＝L1；
When R isc＝Hr+HtI.e. when the arch of the cat back curve is level on the ground, Lt＝L1；
L1＝Rcsinα。
Wherein HtTo the depth of the excavated area, LtFor the length of the excavated area, L1The horizontal length from the beginning of the cat back curve to the vault section, i.e., the horizontal length of the AM section in fig. 3 or fig. 4.
The length L of the hoisting curve can be calculated according to the length of the excavated areacThe specific calculation formula is as follows:
when R isc≠Hr+Ht+HbWhen L isc＝L1+L2-Lt-Lb；
When R isc＝Hr+Ht+HbWhen L isc＝0；
Figure BDA0002656471970000094
Further, in step 4, the starting point of the cat back curve is determined to be A (X)A,YA) The other characteristic points are B (X)B,YB)、C(XC,YC)、M(XM,YM)、N(XN,YN)、E(XE,YE)、F(XF,YF) And the calculation formula of the coordinates of other points is as follows:
XB＝(L1+L2-L2/2)/Nx*1000+XA
Figure BDA0002656471970000095
XC＝(L1+L2)/Nx*1000+XA
YC＝(Hb+Ht)/Ny*1000+YA；
XM＝L1/Nx*1000+XA
YM＝(Hc+Ht)/Ny*1000+YA；
Figure BDA0002656471970000101
Figure BDA0002656471970000102
XE＝-10
YE＝Ht/Ny*1000；
XF＝(L1+L2)/Ny*1000+10
YF＝Ht/Ny*1000。
wherein L is1The horizontal length from the beginning of the cat back curve to the vault section, i.e., the horizontal length of the AM section in fig. 3 or fig. 4. L is2The horizontal length from the arch of the cat back curve to the terminal section, namely the horizontal length of the MC section in figure 3 or figure 4. N is a radical ofxFor transverse scaling, NyTo scale longitudinally, HcIs the arch height of the overground part of the cat back curve, and beta is the circle center corner corresponding to the section from the arch top of the cat back curve to the inflection point (i.e. MB section in 3 or 4).
The point A is the starting point of the cat lifting back curve, the point B is the end point of the cat lifting back curve and is also the starting point of the downward bending curve, the point C is the end point of the downward bending curve, the point M is the vault of the cat lifting back curve, the point N is the middle point of the downward bending curve, the point E is the starting point of the ground line, and the point F is the end point of the ground line. The points are the characteristic points of the curve in the process of drawing the cat back curve, and the cat back curve can be easily drawn through the coordinates of the points.
Further, the arrangement mode of the hoisting points in the step 5 comprises a centering arrangement and a sequential arrangement, wherein the centering arrangement is that the hoisting points are arranged from the highest point of the arch of the cat back curve to two sides in an equal span manner until the span is not satisfied; the lifting points are sequentially arranged at equal intervals from the initial point of the cat back curve according to the span until the span is not satisfied.
Further, the calculation formula of the number of the suspension points of the cat back curve is as follows:
when the suspension points are arranged in sequence:
Figure BDA0002656471970000103
when the suspension point arrangement mode is the central arrangement: n is n1+n2
Figure BDA0002656471970000104
Figure BDA0002656471970000105
Ls＝L1-Lt-L0(n1-1)-L0/2
Wherein n is the number of suspension points, n1Number of hanging points of front section of arch of cat back curve, n2The number of suspension points at the rear section of the arch of the cat back curve, the length of the cat back curve, LsDistance L from the first hanging point on the cat back curve to the starting point of the cat back curve0Span of adjacent suspension points on the cat back curve, L1The horizontal length from the beginning of the cat back curve to the vault section, i.e. the horizontal length of the AM section in FIG. 3 or FIG. 4, LtTo the length of the excavated area, L2The horizontal length from the arch of the cat back curve to the terminal section, i.e. the horizontal length of the MC section in fig. 3 or 4, LbThe horizontal length of the cat back curve into the sending trough section.
Number of hanging pointsThe amount is the number of the cat back curve supports. After the cat back curve is drawn, the arrangement scheme of the cat back curve support can be obtained according to the number of the hoisting points, the span between the adjacent hoisting points and the arch height of the hoisting curve. Cat back curve overground part arch height HcThe specific calculation formula of (A) is as follows:
Hc＝Rc-Hr-Ht。
furthermore, the value range of the soil-out angle is 4-12 degrees. The size of the unearthing angle needs to be determined according to the terrain and the pipe diameter of the back-dragging pipeline, and the larger the pipe diameter is, the smaller the unearthing angle needs to be selected.
Further, as shown in fig. 2, in step 6, the cat back curve support includes:
the rolling support 1 is connected with the top of the upright steel pipe 4 through a channel steel 2;
the top flange 3 is arranged between the channel steel 2 and the upright steel pipe 4, the top flange 3 is connected with the anchor box 8 through a steel wire rope 7, the anchor box 8 is buried underground, and the steel wire rope 7 and the anchor box 8 are matched and are provided with a plurality of steel wire ropes;
and the shear key 6 is arranged at the bottom end of the upright steel pipe 4 and is buried underground.
Further, the rolling support 1 is connected with a channel steel 2 through a bolt, and the channel steel 2 is connected with the top of the upright steel pipe 4 in a welding mode; a bottom flange 5 is arranged between the bottom end of the upright steel pipe 4 and the shear key 6.
The back tow pipe is used for constructing a cat back curve by towing the arranged cat back curve supports one by one. The back dragging pipeline acts on the rolling support 1, the rolling support 1 is connected with a D800 steel pipe upright post 4 through a bolt, and two ends of the steel pipe upright post 4 are sealed by flanges. The lower part of steel pipe stand 4 directly is used in subaerial, and upper portion is detachable rolling support 1, in order to increase the stability of steel pipe stand 4, has set up 6 guys at the top of steel pipe stand 4 and has divided the equidirectional anchor to bury underground on watering anchor case 8. The steel tube upright post 4 can realize the random change of the height of the cat back curve support through welding and cutting. In the embodiment, the structure of the cat back curve support is calculated by general structure finite analysis software SAP2000, and a single support can meet the vertical force of 50 tons.
In this embodiment, the structure of the cat back curve support is illustrated by taking a certain directional crossing as an example: the crossing length is 2000m, and the specification of the back dragging pipeline is D610 multiplied by 15.9mm L450M longitudinal submerged arc welded steel pipe. The directional drilling penetration angles are all 14 degrees. The rolling support 1 adopts a D600 pipeline rolling support, the lower part of the rolling support 1 is connected with two channel steel 2 through bolts, the model of the channel steel 2 is [20b ], and the channel steel 2 is connected with a top flange 3 of a steel pipe upright post 4 in a welding mode. The edge of the flange plate at the top of the steel tube upright post 4 is provided with a hole with the aperture of 30 mm. The size of the anchor box 8 is a cube with the side length of 1m, the side length of the bottom plate is 2m, three rib plates are arranged between the bottom plate and each side wall, and the dimension of each rib plate is 250mm multiplied by 500mm multiplied by 10 mm. The top of the anchor box 8 is provided with an ear plate, and the opening of the ear plate is 30 mm. The top flange 3 and the ear plate of the anchor box 8 are connected by a steel wire rope 7, the included angle between the steel wire rope 7 and the bottom surface is 60 degrees, and the model of the steel wire rope 7 is phi 20-6 multiplied by 7 FC 1670. The specification of the upright steel tube 4 is D800 multiplied by 20mm Q345, and the upright steel tube 4 is welded or cut according to the arrangement height of the cat back curve. The shear key 6 is arranged below the bottom plate of the upright post steel pipe 4, and the height of the shear key 6 is 200 mm. A cat back curve support is selected to construct a cat back curve, so that back dragging construction can be carried out for no more than three days; the installation and construction are simple and convenient, and the disassembly is flexible; no influence on the environment is caused; the adaptability is strong, and the device is suitable for steel pipes with all pipe diameters; and can be repeatedly used.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those of ordinary skill in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It will be understood by those skilled in the art that while the present invention has been described with reference to exemplary embodiments, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. A design method for directional drilling and back-dragging of an oil and gas pipeline is characterized by comprising the following steps:
step 1, determining the curvature radius of a cat back curve according to the directional drilling axis and a pipe of a back dragging pipeline;
step 2, determining a sending form of the pipeline back dragging according to the topographic conditions of the pipeline back dragging construction site, and calculating the excavation depth of the excavation area and the length of the excavation area according to the sending form;
step 3, determining a starting point of the cat back curve and calculating corresponding coordinates of a plurality of characteristic points on the cat back curve;
step 4, drawing a cat back curve through drawing software according to the corresponding coordinates of the starting point and the plurality of characteristic points in the step 3;
step 5, determining the unearthed angle of the towing pipeline and the span between adjacent hoisting points of the cat back curve according to the pipe diameter of the towing pipeline, and calculating the number of the hoisting points of the cat back curve;
and 6, obtaining an arrangement scheme of the cat back curve support according to the drawn cat back curve, the span between the adjacent hoisting points in the step 5, the number of the hoisting points and the arrangement mode of the hoisting points, and finishing the directional drilling back dragging design of the oil and gas pipeline.
2. The design method for directional drilling and back dragging of the oil and gas pipeline according to claim 1, wherein a specific calculation formula of the curvature radius of the cat back curve in the step 1 is as follows:
Rc≥Rmin
Rmin＝ED/(2Fb)
wherein R iscRadius of curvature of cat back curve, RminIs the minimum of the back curve of catRadius of curvature, E is the modulus of elasticity of the back haul pipe, D is the outside diameter of the back haul pipe, FbTo pull back the bending stress of the pipe.
3. The design method for directional drilling and back-dragging of the oil and gas pipeline according to claim 1, wherein the sending mode of the pipeline back-dragging in the step 2 comprises sending of a sending ditch and sending of a roller frame, and when the terrain of the unearthed end is flat and no sundries exist on the ground or underground, the sending mode of the sending ditch is selected; when the terrain of the unearthed end is complex or the soil quality is poor, a roller frame sending mode is selected.
4. The design method for directional drilling and back-dragging of the oil and gas pipeline according to claim 3, wherein the calculation formula of the excavation depth of the excavation area in the step 2 is as follows:
Ht≤Htmax
Htmax＝min{Htmax1,Htmax2}
Htmax1＝Ld sinα
Htmax2＝Rc-Hr-Hb
Hr＝Rc cosα
when transmitting for the transmit channel:
Figure FDA0002656471960000021
when sending for the roller frame:
Figure FDA0002656471960000022
wherein HtFor the excavation depth of the excavation zone, Htmax1Maximum excavation depth, H, for length control of the straight pipe segments at the unearthed endtmax2Maximum excavation depth for single-arc curve control of unearthed end, HtmaxTo a maximum excavation depth, LdIs the length of the soil end straight pipe section, alpha is the soil emergence angle, RcRadius of curvature of the cat back curve, HrIs the product of the curvature radius of the cat back curve and the cosine value of the unearthed angle, HbIn order to back-drag the pipelineThe distance from the heart to the ground, D is the outer diameter of the back-dragging pipeline, Hd1For the distance from the top of the pipe to the ground, Hd2The distance from the bottom of the tube to the ground is sent to the roller frame.
5. The design method for directional drilling and back-dragging of the oil and gas pipeline according to claim 4, wherein the calculation formula of the excavation length of the excavation area in the step 2 is as follows:
when R isc＞Hr+HtWhen the temperature of the water is higher than the set temperature,
Figure FDA0002656471960000023
when R isc＜Hr+HtI.e. when the cat back curve is all below the ground, Lt＝L1；
When R isc＝Hr+HtI.e. when the arch of the cat back curve is level on the ground, Lt＝L1；
L1＝Rc sinα；
Wherein HtTo an excavation depth, LtFor excavation length, L1The horizontal length from the beginning of the cat back curve to the segment of the dome.
6. The design method for directional drilling back of oil and gas pipeline according to claim 4, wherein the starting point of the cat back curve determined in step 3 is A (X)A,YA) The other characteristic points are B (X)B,YB)、C(XC,YC)、M(XM,YM)、N(XN,YN)、E(XE,YE)、F(XF,YF) And the calculation formula of the coordinates of other points is as follows:
XB＝(L1+L2-L2/2)/Nx*1000+XA
Figure FDA0002656471960000024
XC＝(L1+L2)/Nx*1000+XA
YC＝(Hb+Ht)/Ny*1000+YA；
XM＝L1/Nx*1000+XA
YM＝(Hc+Ht)/Ny*1000+YA；
Figure FDA0002656471960000031
Figure FDA0002656471960000032
XE＝-10
YE＝Ht/Ny*1000；
XF＝(L1+L2)/Ny*1000+10
YF＝Ht/Ny*1000
wherein L is1The horizontal length from the beginning of the cat back curve to the arch top section, L2The horizontal length from the vault of the cat back curve to the terminal section, NxFor transverse scaling, NyTo scale longitudinally, HcThe arch height of the overground part of the cat back curve is shown, and beta is the circle center corner corresponding to the section from the arch top of the cat back curve to the back curve point.
7. The design method for directional drilling and back dragging of the oil and gas pipeline according to claim 1, wherein the arrangement mode of the hoisting points in the step 6 comprises centering arrangement and sequential arrangement, wherein the centering arrangement is that the hoisting points are arranged in equal span from the highest point of the arch of the cat back curve to two sides until the span is not met; the lifting points are sequentially arranged at equal intervals from the initial point of the cat back curve according to the span until the span is not satisfied.
8. The design method for directional drilling back of oil and gas pipelines according to claim 7, wherein the calculation formula of the number of hoisting points of the cat back curve is as follows:
when the suspension points are arranged in sequence:
Figure FDA0002656471960000033
(integer) +1
When the suspension point arrangement mode is the central arrangement: n is n1+n2
Figure FDA0002656471960000034
(integer) +1
Figure FDA0002656471960000035
(integer) +1
Wherein n is the number of suspension points, n1Number of hanging points of front section of arch of cat back curve, n2The number of suspension points L of the rear section of the arch of the cat back curvecIs the length of the cat back curve, LsDistance L from the first hanging point on the cat back curve to the starting point of the cat back curve0Span of adjacent suspension points on the cat back curve, L1The horizontal length from the beginning of the cat back curve to the arch top section, LtTo the length of the excavated area, L2The horizontal length from the vault to the terminal section of the cat back curve, LbThe horizontal length of the cat back curve into the sending trough section.
9. The design method for directional drilling back of oil and gas pipelines according to claim 1, wherein the cat back curve support in the step 6 comprises the following steps:
the rolling support (1) is connected with the top of the upright steel pipe (4) through a channel steel (2);
the top flange (3) is arranged between the channel steel (2) and the upright steel pipe (4), the top flange (3) is connected with an anchor box (8) through a steel wire rope (7), the anchor box (8) is buried underground, and the steel wire rope (7) and the anchor box (8) are matched and are provided in plurality;
and the shear key (6) is arranged at the bottom end of the upright post steel pipe (4) and is embedded underground.
10. The design method for the directional drilling and pulling back of the oil and gas pipeline according to claim 8 is characterized in that the rolling support (1) is connected with the channel steel (2) through bolts, and the channel steel (2) is connected with the top of the upright steel pipe (4) in a welding mode; and a bottom flange (5) is arranged between the bottom end of the upright post steel pipe (4) and the shear key (6).
CN202010889399.9A 2020-08-28 2020-08-28 Oil and gas pipeline directional drilling back-dragging design method Pending CN112035975A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010889399.9A CN112035975A (en) 2020-08-28 2020-08-28 Oil and gas pipeline directional drilling back-dragging design method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010889399.9A CN112035975A (en) 2020-08-28 2020-08-28 Oil and gas pipeline directional drilling back-dragging design method

Publications (1)

Publication Number Publication Date
CN112035975A true CN112035975A (en) 2020-12-04

Family

ID=73587143

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010889399.9A Pending CN112035975A (en) 2020-08-28 2020-08-28 Oil and gas pipeline directional drilling back-dragging design method

Country Status (1)

Country Link
CN (1) CN112035975A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113482530A (en) * 2021-08-20 2021-10-08 北京城建亚泰建设集团有限公司 Site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process
CN114110256A (en) * 2021-11-25 2022-03-01 四川石油天然气建设工程有限责任公司 Construction method of horizontal directional drill and pipeline back-dragging process

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4821815A (en) * 1986-05-22 1989-04-18 Flowmole Corporation Technique for providing an underground tunnel utilizing a powered boring device
CN1329222A (en) * 2001-08-10 2002-01-02 冯树刚 Device for drilling and crossing river by directly tracking designed curve through pipeline
CN102734556A (en) * 2012-06-15 2012-10-17 上海市电力公司 Trenchless construction method for power pipes
CN107203316A (en) * 2017-06-22 2017-09-26 贵州财经大学 Horizontal directional drilling pipeline returns and drags computational methods and device
CN110778272A (en) * 2019-10-28 2020-02-11 中国电建集团河南工程有限公司 Non-excavation laying construction method for large-diameter heat supply network pipeline
CN110805428A (en) * 2019-10-29 2020-02-18 北京市燃气集团有限责任公司 Directional drilling track fitting method and device based on pipeline length

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4821815A (en) * 1986-05-22 1989-04-18 Flowmole Corporation Technique for providing an underground tunnel utilizing a powered boring device
CN1329222A (en) * 2001-08-10 2002-01-02 冯树刚 Device for drilling and crossing river by directly tracking designed curve through pipeline
CN102734556A (en) * 2012-06-15 2012-10-17 上海市电力公司 Trenchless construction method for power pipes
CN107203316A (en) * 2017-06-22 2017-09-26 贵州财经大学 Horizontal directional drilling pipeline returns and drags computational methods and device
CN110778272A (en) * 2019-10-28 2020-02-11 中国电建集团河南工程有限公司 Non-excavation laying construction method for large-diameter heat supply network pipeline
CN110805428A (en) * 2019-10-29 2020-02-18 北京市燃气集团有限责任公司 Directional drilling track fitting method and device based on pipeline length

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
汪爽: "水平定向钻穿越管道回拖作业过程的力学分析及软件实现", 中国优秀硕士学位论文全文数据库工程科技I辑, 15 April 2016 (2016-04-15), pages 019 - 598 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113482530A (en) * 2021-08-20 2021-10-08 北京城建亚泰建设集团有限公司 Site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process
CN113482530B (en) * 2021-08-20 2022-10-14 北京城建亚泰建设集团有限公司 Site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process
CN114110256A (en) * 2021-11-25 2022-03-01 四川石油天然气建设工程有限责任公司 Construction method of horizontal directional drill and pipeline back-dragging process

Similar Documents

Publication Publication Date Title
CN106320346B (en) Campshed adds anchor cable grouting behind shaft or drift lining deep foundation pit supporting construction method
CN104612162B (en) A kind of Deep Foundation Pit of Metro Stations excavation construction method
CN104533446B (en) Construction method and its structure that a kind of big cross section Support System in Soft Rock Tunnels bilayer pre- Geological disaster prevention of preliminary bracing occurs
CN108442382B (en) In-situ protection and enclosure soil-retaining structure for pressure pipeline crossing deep foundation pit and construction method
CN105887813A (en) Large-diameter super-long pile construction method in karst area through full-casing pipe full rotating and rotary drilling
CN109024651B (en) Steel pipe concrete mixed pile foundation and construction method
CN109944593B (en) Reinforcing method for shield tunnel to penetrate existing building
CN112035975A (en) Oil and gas pipeline directional drilling back-dragging design method
CN108487256B (en) Reinforced structure and method for deepening and super-digging foundation pit
CN104631438B (en) Long auger guncreting uplift pile construction method
CN111379573B (en) Connecting system for connecting shield tunnel in middle of oil and gas pipeline
CN107663865A (en) A kind of cable-stayed type immersed tube tunnel structure and method
CN105908625A (en) Construction method for adding frame bridge under existing railway line based on dragging method
CN107700479A (en) A kind of construction method of large diameter drill hole pile
CN110206071B (en) Method and device for reinforcing joints of underground continuous wall
CN107653878A (en) Cast-in-situ bored pile is reusable to be longitudinally separated formula steel pile casting construction
CN110777775A (en) Foundation pit structure and construction method thereof
CN110093927A (en) A method of the deformation of control foundation pit outer tunnel
CN110924401A (en) Construction foundation pit supporting mode for combined arching and bearing of mixing piles and cast-in-place piles
CN111379574B (en) Method for connecting oil-gas pipeline into shield tunnel from middle
CN114960715A (en) Underground engineering surge treatment device and control method
CN107476293A (en) A kind of quick spreading structure of soft soil foundation bored concrete pile configures and its spreading method
CN210033432U (en) Reinforcing structure for shield tunnel to penetrate existing building
CN210266160U (en) Construction device for shield to pass through underground pipeline
CN209816867U (en) A supporting construction for peripheral foundation ditch of existing building

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination