CN114458155A - Wellhead fixed type radial drilling well completion method - Google Patents

Wellhead fixed type radial drilling well completion method Download PDF

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Publication number
CN114458155A
CN114458155A CN202011135082.2A CN202011135082A CN114458155A CN 114458155 A CN114458155 A CN 114458155A CN 202011135082 A CN202011135082 A CN 202011135082A CN 114458155 A CN114458155 A CN 114458155A
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CN
China
Prior art keywords
sealing
coiled tubing
joint
oil pipe
dynamic
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Pending
Application number
CN202011135082.2A
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Chinese (zh)
Inventor
王世洁
赵海洋
贾晓斌
张�杰
万小勇
杜春朝
吴春洪
李林涛
樊凌云
黄亮
谷海霞
黄传艳
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China Petroleum and Chemical Corp
Sinopec Northwest Oil Field Co
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China Petroleum and Chemical Corp
Sinopec Northwest Oil Field Co
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Application filed by China Petroleum and Chemical Corp, Sinopec Northwest Oil Field Co filed Critical China Petroleum and Chemical Corp
Priority to CN202011135082.2A priority Critical patent/CN114458155A/en
Publication of CN114458155A publication Critical patent/CN114458155A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/122—Multiple string packers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/046—Directional drilling horizontal 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 a wellhead fixed type radial drilling well completion method, which changes the original injection mode in a coiled tubing into the injection mode through an annulus between the tubing and the coiled tubing by using a dynamic sealing tool, and specifically comprises the following steps: s1, assembling the oil pipe column according to the sequence from bottom to top: oil pipe-dynamic sealing tool-oil pipe anchor-directional short joint-steering gear; s2 depth correction and positioning; s3, installing an inlet device; s4, conveying the pipe column to a preset position by a coiled tubing at the bottom of the well; s5 injecting liquid; liquid or drilling fluid is injected into an annular space between the oil pipe and the continuous oil pipe through a jet pump, and then high-pressure water jet is sprayed out from a drill bit spray head to cut rocks and break the rocks for drilling; s6 presents a coiled tubing transfer string. The invention solves the problem of large hydraulic loss of the continuous oil pipe, improves the water power of the spray head, greatly increases the rock breaking drilling capability, and provides a standard for standardizing construction standards and ensuring the safety of constructors.

Description

Wellhead fixed type radial drilling well completion method
Technical Field
The invention belongs to the technical field of oil and gas exploitation, and particularly relates to a wellhead fixed type radial drilling well completion method.
Background
A large number of seam holes are formed around the near wellbore of the tower and river carbonate rock reservoir, all-dimensional communication needs to be achieved through a radial hydraulic jet drilling well completion technology, and the reserve utilization degree is greatly improved.
The conventional coiled tubing conveying process is to inject high-speed fluid into the coiled tubing, and break rock after the high-speed fluid is sprayed out through a nozzle, so that rock breaking and drilling are realized. The Tahe Ordovician reservoir is buried deeply, the hydraulic on-way loss of the coiled tubing is large in the coiled tubing conveying process, and the hydraulic power on the spray head is insufficient under the condition of certain total hydraulic power, so that the rock breaking efficiency is influenced. How to reduce the friction resistance of the coiled tubing becomes a main problem facing the industry.
CN103924923A discloses a synchronous multi-branch radial horizontal well completion method and tool, the basic working principle of which is as follows: the well cementing is carried out by using a casing pipe with a reserved hole in the operating oil-gas well, the reserved hole is in a closed state by using an inner sliding sleeve, all the reserved holes are sequentially opened by using a hydraulic anchor which is put into a coiled tubing in a radial drilling process, and the casing windowing operation in all the traditional processes is completed; then, a plurality of strands of high-pressure hoses clamped by a high-pressure hose clamp are put in, and the steering and butt joint of the clamp are realized under the combined action of the clamp and the multi-track steering gear, so that the plurality of strands of high-pressure hoses can smoothly enter respective tracks, and the purpose of completing a plurality of radial holes by one-time drilling is realized. However, due to the deep burial depth of the taheaotao system reservoir, the hydraulic on-way loss of the coiled tubing is large in the coiled tubing conveying process, and the hydraulic power on the spray head is insufficient under the condition of certain total hydraulic power, so that the rock breaking efficiency is low.
CN110552617A discloses a radial drilling completion method and system for deep well, which comprises the following steps: the method comprises the following steps of (1) enabling a pipeline with a steering gear at the bottom to be lowered to a target interval of the deep well; determining the position of a storage body in the target layer section, and determining the target direction of the steering gear according to the position; fixing the pipeline; and (3) lowering the infusion pipeline to the target layer section from the interior of the pipeline, and pumping working fluid into the infusion pipeline to communicate with the reservoir body. The invention can break the rock of the deep well through the working solution and the infusion pipeline, optimize the pressure loss and the friction force of the system to achieve the goal of footage, and can also determine the orientation of the storage body in the target layer section through the positioning device. Due to the high downhole pressure of radial drilling operations, higher demands are made on the sealing capacity of the tool. However, the patent does not consider the sealing ability of the tool during the radial drilling process downhole, and certain problems may exist during the construction process.
Therefore, it is needed to provide a wellhead fixed type radial drilling well completion method with low hydraulic friction of a conveying pipe column, large nozzle hydraulic power and high rock breaking efficiency.
Disclosure of Invention
In order to solve the technical problems, the invention provides a wellhead fixed type radial drilling well completion method, which changes the original injection mode in a coiled tubing into the injection mode in an annulus between the tubing and the coiled tubing by using a dynamic sealing tool, reduces the hydraulic friction of a conveying pipe column, increases the hydrodynamic force of a nozzle and improves the rock breaking efficiency.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a wellhead fixed type radial drilling well completion method, which realizes the injection of high-pressure water jet from a coiled tubing and an annular space of the tubing through a dynamic sealing tool.
Preferably, the wellhead fixed type radial drilling completion method specifically comprises the following steps:
s1, assembling the oil pipe column; the oil pipe column is assembled according to the sequence from bottom to top: the method specifically comprises the following steps: oil pipe-dynamic seal-oil pipe anchor-directional short joint-steering gear;
s2, depth correction and positioning; the instrument used for depth correction is a GR + CCL logging instrument, and the instrument used for positioning is a gyroscope;
s3, installing an inlet device; the installation of the inlet device comprises a sitting oil pipe hanger, a Christmas tree and a continuous oil pipe;
s4, conveying the pipe column to a preset position by a coiled tubing at the bottom; the continuous oil pipe transmission device comprises a spray head, a semi-rigid pipe and a circulation device;
s5, injecting liquid; liquid or drilling fluid is injected into an annular space between the oil pipe and the continuous oil pipe through a jet pump, and then high-pressure water jet is sprayed out from a drill bit spray head to cut rocks and break the rocks for drilling;
s6, putting forward a coiled tubing transmission string;
and after the spray head drills into the reservoir body and is communicated with the reservoir body, the coiled tubing transmission pipe column is lifted out.
Preferably, the dynamic sealing tool is connected to the tubular column of the oil pipe in a threaded mode and enters the well along with the tubular column of the oil pipe, the dynamic sealing tool slides on the coiled tubing and has certain sealing capacity, high-pressure water jet is injected from the annular space between the coiled tubing and the oil pipe, the hydraulic loss of the coiled tubing is reduced, and the rock breaking efficiency of the spray head is improved.
Preferably, the dynamic sealing tool comprises an upper joint, a PEEK righting piece, a middle joint, a dynamic sealing joint, a lower joint, a sealing sleeve, a fan-shaped valve, a tooth-shaped ring, a middle ring, a dynamic sealing support ring and an O-shaped sealing ring;
the connection mode between every two adjacent joints is threaded connection;
the upper joint is connected with the middle joint in a lower mode, the upper end PEEK centering sheet is axially fastened, and the lower joint is connected with the middle joint in an upper mode, and the lower end PEEK centering sheet is axially fastened;
the upper end and the lower end of the dynamic seal joint are respectively connected with an intermediate joint, so that the dynamic seal combination is axially fastened;
a sealing sleeve is arranged between the dynamic sealing combination and the dynamic sealing joint; the tooth-shaped ring and the four fan-shaped petals are radially matched to form a unit sealing combination, and each unit sealing combination is axially matched through a middle ring or a dynamic sealing support ring;
four identical oil guide holes are uniformly distributed on the upper joint, the middle joint and the dynamic sealing joint in the circumferential direction;
four open grooves and four fan-shaped grooves are uniformly distributed on the dynamic sealing joint.
Preferably, the tooth-shaped ring is provided with two same tooth-shaped structures, the tooth-shaped structures are provided with a large sealing angle and a small sealing angle, the large sealing angle is 70 degrees, the small sealing angle is 20 degrees, and the two tooth-shaped structures are symmetrically arranged, so that reciprocating sealing is realized; the width of the non-installed state is slightly larger than the width of the sector petals.
Further preferably, the sector angle of the sector lobes is 88-89 degrees, so that certain gaps are formed among the sector lobes; the sharp corners of the narrow sides of the fan-shaped petals are chamfered with round corners, and the fan-shaped petals in the adjacent unit sealing combination are installed in a staggered way by 45 degrees.
Further preferably, the width of the opening groove on the inner ring of the dynamic sealing joint is consistent with the diameter of the oil guide hole, and the fan-shaped angles of the fan-shaped grooves are all 60 degrees.
Further preferably, the upper part and the lower part of the dynamic seal joint and the dynamic seal support ring are respectively provided with two side-by-side O-shaped seal rings.
Further preferably, the tooth-shaped ring and the sealing sleeve are made of high-temperature-resistant polytetrafluoroethylene with an extremely low friction coefficient, and the O-shaped sealing ring is made of fluororubber, hydrogenated nitrile rubber or polyurethane.
Preferably, the wellhead fixed radial drilling completion method further comprises the step of using the dynamic sealing tool with a coiled tubing and a flow device.
Further preferably, the method for using the dynamic sealing tool with the coiled tubing and the flow device in a matched mode comprises the following steps:
after the coiled tubing string is put into the well, the pump injects high-speed fluid, the high-speed fluid advances to the well bottom from the annular space of the tubing and the coiled tubing, and when the dynamic sealing tool is met, the fluid enters the coiled tubing from the outside of the coiled tubing through the circulating device. When fluid is injected at a high speed, the coiled tubing is lowered at a certain speed, the coiled tubing at the bottom penetrates through the dynamic seal in a sliding mode, and the dynamic seal still has certain sealing capacity at the moment, so that the fluid is enabled to completely enter a stratum through the flow passage.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through the use of the dynamic sealing tool, the original injection mode in the coiled tubing is changed into the injection mode through the annular space between the tubing and the coiled tubing, so that the problem of large hydraulic loss of the coiled tubing is solved, the nozzle hydrodynamic force is improved, the rock breaking drilling capability is greatly increased, and the dynamic sealing tool provides a standard for standardizing the construction standard and ensuring the safety of constructors.
Drawings
FIG. 1 is a schematic illustration of a wellhead fixed radial bore completion method of the present invention.
FIG. 2 is a schematic illustration of a wellhead-mounted radial borehole completion method according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of the dynamic sealing tool of the present invention.
Fig. 4 is a partially enlarged view of a in fig. 3.
Fig. 5 is a sectional view of section B-B of fig. 4.
Fig. 6 is a schematic structural view of the dynamic seal assembly.
Fig. 7 is a schematic structural view of the unit sealing assembly.
Fig. 8 is a top view of fig. 7.
In the figure, the position of the upper end of the main shaft,
l1, a coiled tubing spiral section, L2, a coiled tubing vertical pipe section, L3, a vertical well section annulus, L4, a semi-rigid pipe, L5, a steering gear, L6, a horizontal well section annulus;
s1, assembling an oil pipe column, S2, depth correction and orientation, S3, installing a wellhead device, S4, transferring the coiled tubing at the lower bottom to a preset position, S5, injecting liquid, S6, and lifting the coiled tubing transfer column;
1. the device comprises an upper joint, 2, a PEEK righting piece, 3, a middle joint, 4, a dynamic seal joint, 4-1, an oil guide hole, 4-2, an open slot, 4-3, a fan-shaped groove, 5, a lower joint, 6, a seal sleeve, 7, a fan-shaped valve, 8, a tooth-shaped ring, 9, a middle ring, 10, a dynamic seal support ring, 11 and an O-shaped seal ring.
Detailed Description
The following description of the embodiments of the present invention with reference to specific embodiments is provided to further illustrate the embodiments of the present invention, and it should be understood that the scope of the present invention is not limited to the specific embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, wherein the locating sub is a section of short tubing of a particular length that during logging will be displayed differently from the collar wavelength of conventional tubing, can be accurately identified, and facilitates location.
FIG. 1 is a schematic diagram of a wellhead-fixed radial borehole completion method, comprising sequentially connected coiled tubing spiral section L1, coiled tubing vertical section L2, vertical well section annulus L3, semi-rigid tube L5, diverter L5 and horizontal well section annulus L6; the wellhead fixed type radial drilling well completion method also relates to a dynamic sealing tool as shown in figures 3-8, the dynamic sealing tool can achieve certain sealing capacity when the coiled tubing slides through the dynamic sealing tool, high-pressure water jet can be injected from the annular space of the coiled tubing and the tubing, hydraulic loss of the coiled tubing is reduced, and the rock breaking efficiency of the spray head is improved.
The dynamic sealing tool comprises an upper joint 1, a PEEK righting piece 2, a middle joint 3, a dynamic sealing joint 4, a lower joint 5, a sealing sleeve 6, a sector valve 7, a tooth-shaped ring 8, a middle ring 9, a dynamic sealing support ring 10 and an O-shaped sealing ring 11.
The connection mode between every two adjacent joints is threaded connection; the upper joint 1 is connected with an oil pipe in an upper mode, the lower joint is connected with the middle joint 3 in a lower mode, and the PEEK centralizing piece 2 at the upper end is axially fastened; the lower joint 5 is connected with an oil pipe in a lower mode, the upper joint is connected with the middle joint 3, and the PEEK righting piece 2 at the lower end is axially fastened.
Four oil guide holes 4-1 are uniformly distributed on the upper joint 1, the middle joint 3 and the dynamic sealing joint 4 in the circumferential direction, four open slots 4-2 and four fan-shaped slots 4-3 are correspondingly arranged at the four oil guide holes 4-1 on the middle joint 4 respectively, wherein the opening width of the open slot 4-2 is consistent with that of the oil guide hole 4-1, and the fan-shaped angle of the fan-shaped slot 4-2 is 60 degrees. The oil guide hole 4-1, the open slot 4-2 and the fan-shaped slot 4-3 are used for transmitting the fluid pressure to the sealing sleeve 6. The sealing sleeve 6 is arranged between the middle joint 3 and the dynamic sealing combination and has the functions of isolating the dynamic sealing combination from fluid and transmitting the pressure of oil. The left side and the right side of the upper end and the lower end of the sealing ring are respectively provided with two parallel O-shaped sealing rings 11, so that the sealing performance is improved, and the sealing ring is made of fluororubber, hydrogenated nitrile rubber or polyurethane.
The dynamic seal combination consists of four unit seal combinations, three middle rings 9 and two dynamic seal support rings 10, and one unit seal combination consists of a tooth-shaped ring 8 and four fan-shaped petals 7.
The tooth-shaped ring 8 is made of high-temperature-resistant polytetrafluoroethylene with an extremely low friction coefficient, the inner ring of the tooth-shaped ring is of two same tooth-shaped structures, the tooth-shaped structures are provided with a large sealing angle and a small sealing angle, the large sealing angle is 70 degrees, the small sealing angle is 20 degrees, and the two tooth-shaped structures are symmetrically arranged. When the continuous oil pipe passes through, a dynamic pressure oil film can be formed at a large sealing angle, and sealing and lubricating functions are realized. Because a large amount of silt exists in the oil, the space formed by the two small sealed angles has the function of storing the oil and the silt. The reciprocating sealing of the coiled tubing is realized by the symmetrical arrangement of the tooth-shaped structures, and when part of unit sealing combinations fail, the other unit sealing combinations can realize the reciprocating sealing function, so that the service life of the dynamic seal is prolonged, and the sealing reliability is improved.
The sector angle of the sector petals 7 is 88-89 degrees, four sector petals 7 are uniformly distributed in the circumferential direction, a certain gap is formed between every two sector petals 7, and when the sector petals are subjected to pressure transmitted by the sealing sleeve 6, the sector petals 7 are radially closed, so that the tooth-shaped ring 8 is extruded, the contact pressure on the sealing surface is increased, and the sealing reliability is improved. In addition, when the bottom hole pressure changes, the contact pressure on the sealing surface is controlled by controlling the gaps between the fan-shaped petals 7, so that follow-up control is realized: when the sealed pressure is too small, the excessive abrasion caused by the large contact pressure of the sealing surface can be avoided; when the sealed pressure is too big, avoid sealed face contact pressure not enough and the phenomenon of revealing that produces. Four fan-shaped lamella 7 circumference equipartitions realize that the pressure that transmits to profile of tooth circle 8 is more even than single split ring, and two adjacent unit seal combinations stagger 45 and place, make sealed more reliable. The sharp corners of the narrow edges of the fan-shaped petals 7 are chamfered with fillets, so that the sharp corners of the adjacent fan-shaped petals 9 can be prevented from damaging the sealing sleeve 6 and the tooth-shaped ring 7 when the gaps between the adjacent fan-shaped petals change. The initial width of the tooth-shaped ring 8 is larger than that of the fan-shaped petals 7, so that the tooth-shaped ring 8 has a compression effect in the axial direction during installation, and end face leakage is reduced.
Two groups of dynamic seal combinations are symmetrically arranged on the dynamic seal joint 4, and the two groups of dynamic seal combinations are respectively communicated with the upper end and the lower end of a dynamic seal tool through an upper oil guide hole 4-1 and a lower oil guide hole 4-1. If the fluid pressure at the upper end of the dynamic sealing tool is high, the dynamic sealing combination at the upper end plays a main sealing role; if the fluid pressure at the lower end of the dynamic sealing tool is high, the lower dynamic sealing combination plays a main sealing role. And the bidirectional follow-up control of the contact pressure on the sealing surface is realized.
The dynamic sealing tool adopts the tooth-shaped rings which are symmetrically arranged in the double-tooth-shaped structure, when the coiled tubing is lifted and lowered, the dynamic sealing effect can be achieved in two directions, the dynamic sealing performance can be improved by the combination of a plurality of unit seals, and meanwhile, when part of the unit seals fail, other combinations can continue to work, so that the sealing is more reliable, and the replacement is convenient;
fluid passes through a flow passage formed by an oil guide hole, an open slot on the middle joint and a fan-shaped groove, fluid pressure directly acts on the sealing sleeve, and then is transmitted to the fan-shaped petals through the sealing sleeve, and the four fan-shaped petals can enable the pressure to act on the tooth-shaped ring more uniformly in the process of radially pressing the tooth-shaped ring, so that the circumferential contact pressure generated on the sealing surface is more uniform, and the local leakage condition is avoided; meanwhile, the sector flaps of two adjacent unit sealing combinations are arranged in a staggered mode by 45 degrees, so that the sealing is more reliable;
two groups of dynamic seal combinations are symmetrically arranged on a dynamic seal joint, the two groups of dynamic seal combinations are respectively communicated with the upper end and the lower end of a dynamic seal assembly through an upper oil guide hole and a lower oil guide hole, and if the fluid pressure at the upper end of the dynamic seal assembly is high, the upper end dynamic seal combination plays a main sealing role; if the pressure at the lower end of the dynamic seal assembly is high, the dynamic seal assembly at the lower end plays a main sealing role, so that the sealing reliability is improved;
when the bottom hole pressure changes, the contact pressure on the sealing surface is controlled by controlling the clearance between the fan-shaped lobes, so that the follow-up control is realized: when the sealed pressure is too small, the excessive abrasion caused by the large contact pressure of the sealing surface can be avoided; when the sealed pressure is overlarge, the leakage phenomenon caused by insufficient contact pressure of the sealing surface is avoided;
two parallel sealing rings are respectively arranged on the left side and the right side of the two ends of the sealing sleeve, so that leakage among the sealing sleeve, the dynamic sealing joint and the dynamic sealing support ring is prevented; the wider tooth-shaped ring is adopted, so that the pressure of the end face is increased when the tooth-shaped ring is installed, and the end face leakage is reduced.
The wellhead fixed type radial drilling well completion method further comprises the step that the dynamic sealing tool is matched with the continuous oil pipe and the circulation device for use.
Specifically, the method for matching the dynamic sealing tool with the coiled tubing and the flow device comprises the following steps:
after the coiled tubing string is put into the well, the pump injects high-speed fluid, the high-speed fluid advances to the well bottom from the annular space of the tubing and the coiled tubing, and when the dynamic sealing tool is met, the fluid enters the coiled tubing from the outside of the coiled tubing through the circulating device. When fluid is injected at a high speed, the coiled tubing is lowered at a certain speed, the coiled tubing at the bottom penetrates through the dynamic seal in a sliding mode, and the dynamic seal still has certain sealing capacity at the moment, so that the fluid is enabled to completely enter a stratum through the flow passage.
The wellhead fixed type radial drilling well completion method is suitable for a coiled tubing with the length of 150m to slowly penetrate through a dynamic seal and simultaneously has the sealing capacity of 20MPa, the dynamic seal is not damaged after construction, and concretely comprises the following steps:
s1, assembling the oil pipe column; the oil pipe column is assembled according to the sequence from bottom to top: the method specifically comprises the following steps: oil pipe-dynamic sealing tool-oil pipe anchor-directional short joint-steering gear;
s2, depth correction and positioning; the instrument used for depth correction is a GR + CCL logging instrument, and the instrument used for positioning is a gyroscope;
s3, installing an inlet device; the installation of the inlet device comprises a tubing hanger, a Christmas tree and a continuous oil pipe;
s4, conveying the pipe column to a preset position by a coiled tubing at the bottom; the continuous oil pipe transmission device comprises a spray head, a semi-rigid pipe and a circulation device;
s5, injecting liquid; liquid or drilling fluid is injected into an annular space between the oil pipe and the continuous oil pipe through a jet pump, and then high-pressure water jet is sprayed out from a drill bit spray head to cut rocks and break the rocks for drilling;
s6, putting forward a coiled tubing transmission string;
and after the spray head drills into the reservoir body and is communicated with the reservoir body, the coiled tubing transmission pipe column is lifted out.
According to the invention, through the use of the dynamic sealing tool, the original injection mode in the coiled tubing is changed into the injection mode through the annular space between the tubing and the coiled tubing, so that the problem of large hydraulic loss of the coiled tubing is solved, the nozzle hydrodynamic force is improved, the rock breaking drilling capability is greatly increased, and the dynamic sealing tool provides a standard for standardizing the construction standard and ensuring the safety of constructors.
The present invention has been further described with reference to specific embodiments, which are only exemplary and do not limit the scope of 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, and that such changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A wellhead fixed type radial drilling well completion method is characterized in that high-pressure water jet is injected from annular spaces of a coiled tubing and an oil pipe through a dynamic sealing tool.
2. A wellhead fixed radial bore completion method as claimed in claim 1 including the steps of:
s1 assembling oil pipe column
The oil pipe column is assembled according to the sequence from bottom to top:
the method specifically comprises the following steps: oil pipe-dynamic sealing tool-oil pipe anchor-directional short joint-steering gear;
s2, depth correction and positioning;
s3, installing an inlet device; the installation of the inlet device comprises a tubing hanger, a Christmas tree and a continuous oil pipe;
s4, conveying the pipe column to a preset position by a coiled tubing at the bottom; the continuous oil pipe transmission device comprises a spray head, a semi-rigid pipe and a circulation device;
s5, injecting liquid; liquid or drilling fluid is injected into an annular space between the oil pipe and the continuous oil pipe through a jet pump, and then high-pressure water jet is sprayed out from a drill bit spray head to cut rocks and break the rocks for drilling;
s6, putting forward a coiled tubing transmission string;
and after the spray head drills into the reservoir body and is communicated with the reservoir body, the coiled tubing transmission pipe column is lifted out.
3. A wellhead-type radial drilling completion method according to claim 2, characterized in that the dynamic sealing tool is screwed on the string of tubing and is run into the well along with the string of tubing, slides on the coiled tubing and has a certain sealing capacity, and high-pressure water jet injection from the annulus of the coiled tubing and the tubing is realized.
4. A wellhead-fixed radial drilling completion method as claimed in claim 3, wherein the dynamic sealing tool comprises an upper joint, a PEEK centralizing piece, an intermediate joint, a dynamic sealing joint, a lower joint, a sealing sleeve, a sector valve, a toothed ring, an intermediate ring, a dynamic sealing support ring, an O-ring;
the connection mode between every two adjacent joints is threaded connection;
the upper joint is connected with the middle joint in a lower mode, the upper end PEEK centering sheet is axially fastened, and the lower joint is connected with the middle joint in an upper mode, and the lower end PEEK centering sheet is axially fastened;
the upper end and the lower end of the dynamic seal joint are respectively connected with an intermediate joint, so that the dynamic seal combination is axially fastened;
a sealing sleeve is arranged between the dynamic sealing combination and the dynamic sealing joint;
the tooth-shaped ring and the four fan-shaped petals are radially matched to form a unit sealing combination, and each unit sealing combination is axially matched through a middle ring or a dynamic sealing support ring;
four identical oil guide holes are uniformly distributed on the upper joint, the middle joint and the dynamic sealing joint in the circumferential direction;
four open grooves and four fan-shaped grooves are uniformly distributed on the dynamic sealing joint.
5. A wellhead-fixed radial drilling completion method according to claim 4, characterized in that the toothed ring is provided with two identical toothed structures, the toothed structures are provided with a large sealing angle and a small sealing angle, the large sealing angle is 70 degrees, the small sealing angle is 20 degrees, and the two toothed structures are symmetrically arranged so as to realize reciprocating sealing.
6. A wellhead fixed radial drilling completion method according to claim 4, characterized in that the sector angle of said sector flaps is 88 ° -89 °; the sharp corners of the narrow sides of the fan-shaped petals are chamfered with round corners, and the fan-shaped petals in the adjacent unit sealing combination are installed in a staggered way by 45 degrees.
7. A wellhead fixed type radial drilling completion method according to claim 4, characterized in that the width of the opening groove on the inner ring of the dynamic sealing joint is consistent with the diameter of the oil guide hole.
8. A wellhead fixed type radial drilling completion method according to claim 4, characterized in that the dynamic seal joint and the dynamic seal support ring are respectively provided with two side-by-side O-shaped sealing rings at the upper part and the lower part.
9. A method of wellhead fixed radial bore completion according to any of claims 1-8 and also comprising the use of said dynamic seal tool in conjunction with coiled tubing and flow through equipment.
10. A wellhead fixed radial drilling completion method as claimed in claim 9, wherein said dynamic seal tool is used in combination with coiled tubing and flow-through equipment by: after the coiled tubing string is put into the well, the pump injects high-speed fluid, the high-speed fluid advances to the well bottom from the annular space of the tubing and the coiled tubing, and when the dynamic sealing tool is met, the fluid enters the coiled tubing from the outside of the coiled tubing through the circulating device.
CN202011135082.2A 2020-10-21 2020-10-21 Wellhead fixed type radial drilling well completion method Pending CN114458155A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117052333A (en) * 2023-08-01 2023-11-14 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） Radial horizontal well sealing device, drilling equipment and drilling method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117052333A (en) * 2023-08-01 2023-11-14 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） Radial horizontal well sealing device, drilling equipment and drilling method
CN117052333B (en) * 2023-08-01 2024-04-05 天津斯图智能钻探有限公司 Radial horizontal well sealing device, drilling equipment and drilling method

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