Velocity string well completion device

Abstract

The utility model relates to the field of gas well construction, and discloses a speed tubular column well completion device which comprises a wellhead blowout preventer, a coiled tubing injection head, a throwing and fishing tool string, a coiled tubing, a coiled tubing operation machine, a tubing hanger, a speed tubular column body, an outer slip connector, a blanking plug and a connecting tool string. The wellhead blowout preventer is mounted at the wellhead and is matched with a coiled tubing operation machine, the speed string body is tripped into a well to serve as a production string for well completion production, and compared with a conventional method that an under-pressure operation machine is tripped into oil tubes one by one for well completion, the wellhead blowout preventer has the advantage that operation efficiency can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas well construction, especially to a velocity string completion device. BACKGROUND

[0002] After drilling, cementing, perforating, fracturing and gas testing, the oil pipe needs to be lowered into the gas well for completion.

[0003] In the case of installing a large-diameter valve at the wellhead, the conventional method is to use a pressure operation machine to lower the oil pipe one by one for completion, which has the problem of low operation efficiency in the operation process.

[0004] Therefore, it is necessary to design a velocity string completion device to solve the above problems in the prior art. UTILITY MODEL CONTENTS

[0005] Based on the above problems, the utility model aims to provide a velocity string completion device to solve the above problems in the prior art.

[0006] The utility model adopts the following technical scheme:

[0007] The utility model provides a velocity string completion device, which comprises:

[0008] A wellhead blowout preventer is connected to the large-diameter valve at the bottom and to the coiled tubing injector head at the top;

[0009] A fishing tool string is arranged in the wellhead blowout preventer, the top of the fishing tool string is connected to the coiled tubing, the top of the coiled tubing penetrates the coiled tubing injector head and is connected to the coiled tubing operation machine, and the bottom of the fishing tool string is connected to the tubing hanger;

[0010] A velocity string body is formed by cutting the coiled tubing, the bottom of the velocity string body is connected to a plug through an external slip connector, and the top is connected to the tubing hanger through a connection tool string.

[0011] Further, the wellhead blowout preventer comprises, from bottom to top, a drainage tee, a coiled tubing four-gate blowout preventer, a large-diameter suspension device, a pressure relief tee, a blowout preventer pipe and a blowout preventer box, the drainage tee is connected to the large-diameter valve, and the blowout preventer box is connected to the coiled tubing injector head.

[0012] Still further, an operation platform is connected to the top of the pressure relief tee.

[0013] Still further, a needle valve is installed on the side outlet of the drainage tee.

[0014] Further, the housing side of the coiled tubing four-gate blowout preventer is provided with a balance valve.

[0015] Further, the side outlet of the pressure relief tee joint is provided with a plug valve.

[0016] Further, the fishing tool string comprises a rivet connector, a double-valve-petal one-way valve, a centralizer, a fishing spear, a fishing short joint and a fishing head connected in sequence, the rivet connector is connected with the coiled tubing, and the fishing head is connected with the tubing hanger.

[0017] Further, the connecting tool string comprises a load connector connected with the velocity string body, and the load connector is connected with the tubing hanger through a variable-stub short joint.

[0018] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0019] By installing the wellhead blowout preventer at the wellhead and cooperating with the coiled tubing operating machine, the velocity string body is lowered into the well as a production string for well completion production, compared with the conventional method of using the pressurized operating machine to lower the oil pipes one by one for well completion, the utility model can effectively improve the operation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be further described in combination with the accompanying drawings.

[0021] Figure 1 It is a structure schematic view of the wellhead blowout preventer of the utility model embodiment one;

[0022] Figure 2 It is a structure schematic view of the fishing tool string and the connecting tool string of the utility model embodiment one;

[0023] Figure 3 It is a side view of the transport crowbar of the utility model embodiment two;

[0024] Figure 4 It is a top view of the transport crowbar of the utility model embodiment two.

[0025] Explanation of the accompanying symbols: 1. Wellhead blowout preventer; 101. Drain tee; 102. Coiled tubing four-gate blowout preventer; 103. Large-diameter suspension device; 104. Pressure relief tee; 105. Blowout preventer; 106. Blowout preventer box; 107. Operating platform; 2. Large-diameter valve; 3. Coiled tubing injection head; 4. Fishing tool string; 41. Rivet connector; 42. Double-valve check valve; 43. Stabilizer; 44. Fishing spear; 45. Fishing short circuit; 46. Fishing head; 5. Coiled tubing; 6. Tubing hanger; 7. External slip connector; 8. Plug; 9. Connecting tool string; 91. Load connector; 92. Variable buckle short circuit; 10. Velocity string body; 11. Transport skid; 12. Bracket one; 13. Rotating flange; 14. Pipe rack; 15. Bracket two DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1

[0028] like Figures 1-2 As shown, this embodiment 1 discloses a velocity string completion device, including a wellhead blowout preventer 1, the bottom of the wellhead blowout preventer 1 is connected to the large-diameter valve 2 at the wellhead, and the top is connected to the coiled tubing injection head 3; a fishing tool string 4 is arranged in the wellhead blowout preventer 1, the top of the fishing tool string 4 is connected to the coiled tubing 5, the top of the coiled tubing 5 passes through the coiled tubing injection head 3 and is connected to the coiled tubing operation machine, and the bottom of the fishing tool string 4 is connected to the tubing hanger 6; the velocity string body 10 is formed by cutting the coiled tubing 5, the bottom of the velocity string body 10 is connected to the plug 8 via an external slip connector 7, and the top is connected to the tubing hanger 6 via a connecting tool string 9.

[0029] By adopting this solution, by installing a wellhead blowout preventer 1 at the wellhead and cooperating with a continuous tubing operation machine, the velocity string body 10 is lowered into the well as a production string for completion production. Compared with the conventional method of using a pressure operation machine to lower the oil pipes one by one for completion, this method can effectively improve the efficiency of the operation.

[0030] To further optimize the solution, the wellhead blowout preventer 1 includes a drainage tee 101, a coiled tubing four-gate blowout preventer 102, a large-diameter suspension device 103, a pressure relief tee 104, a blowout preventer 105, and a blowout preventer box 106, which are connected in sequence from bottom to top. The drainage tee 101 is connected to the large-diameter valve 2, and the blowout preventer box 106 is connected to the coiled tubing injection head 3.

[0031] Specifically, a needle valve is installed at the side outlet of the discharge tee 101; the coiled tubing four-disc blowout preventer 102 is equipped with a semi-sealed ram, a slip ram, a shear ram, and a fully sealed ram from bottom to top; a balancing valve is provided on the side of the shell of the coiled tubing four-disc blowout preventer 102; a plug valve is installed at the side outlet of the pressure relief tee 104; the large-diameter suspension device 103 can be set as a manual large-diameter suspension device, which can only suspend but not seal, and can meet the operating requirements of the velocity string body 10; the large-diameter suspension device 103 can also be set as a large-diameter suspension device with a built-in sealing ram assembly, which can realize the sealing function, and the shell is equipped with a balancing valve; in this embodiment, the large-diameter suspension device 103 is preferably a large-diameter suspension device that can realize the sealing function, and the shell is equipped with a balancing valve.

[0032] A further optimized solution further includes an operating platform 107, which is fixedly connected to the top of the pressure relief tee 104. The operating platform 107 serves as a place for disassembling the union at the lower end of the lubricator 105.

[0033] To further optimize the solution, the salvage tool string 4 includes a rivet connector 41, a double-valve check valve 42, a centralizer 43, a salvage spear 44, a salvage short circuit 45 and a salvage head 46 connected in sequence. The rivet connector 41 is connected to the coiled tubing 5, and the salvage head 46 is connected to the tubing hanger 6.

[0034] According to a further optimized solution, the connection tool string 9 includes a load connector 91 connected to the velocity string body 10 , and the load connector 91 is connected to the tubing hanger 6 via a variable buckle short circuit 92 .

[0035] Example 2

[0036] like Figures 3-4 As shown, based on the above-mentioned embodiment 1, the difference between this embodiment 2 and the above-mentioned embodiment 1 is that: this embodiment 2 is equipped with a transport skid 11, a rotating flange 13 is installed on one side of the transport skid 11 through a bracket 12, a pipe rack 14 is fixed on the other side of the transport skid 11, and a bracket 2 15 is fixed in the middle of the transport skid 11.

[0037] In the second embodiment, the rotating flange 13 and the second bracket 15 are used to connect and support the entire structure formed by the liquid discharge tee 101, the coiled tubing four-ram blowout preventer 102, the large-diameter suspension device 103, the pressure relief tee 104, and the operating platform 107; the pipe rack 14 is used to limit the lubricant preventer 105.

[0038] The technical scheme has the following beneficial effects.

[0039] By arranging the drain three-way joint 101, the coiled tubing four-gate blowout preventer 102, the large-diameter suspension device 103, the pressure relief three-way joint 104, the operation platform 107 and the blowout preventer pipe 105 on the transport prop 11, the components can be conveniently carried and installed, thereby improving the installation efficiency of the wellhead blowout preventer 1.

[0040] The working process of the utility model is as follows:

[0041] Step one, install the wellhead blowout preventer 1.

[0042] 1, close the large-diameter valve 2, rotate the drain three-way joint 101, the coiled tubing four-gate blowout preventer 102, the large-diameter suspension device 103, the pressure relief three-way joint 104 and the operation platform 107 into an upright state as a whole from the transport prop 11, and install them on the large-diameter valve 2 by a crane; connect the blowout preventer pipe 105, the blowout preventer box 106 and the coiled tubing injection head 3 together, hoist them by the crane, make the coiled tubing 5 pass through the coiled tubing injection head 3, the blowout preventer box 106 and the blowout preventer pipe 105 in turn, and expose a certain length at the lower end of the blowout preventer pipe 105.

[0043] 2, install the outer slip connector 7 at the lower end of the coiled tubing 5 and perform a tension test.

[0044] 1) Perform 45° chamfering treatment on the lower end of the coiled tubing 5, try to ensure that the coiled tubing 5 is vertical, and avoid damaging the sealing ring;

[0045] 2) Install the outer slip connector 7 at the lower end of the coiled tubing 5, and use a mandrel to limit the inner diameter to ensure that the plunger can pass through later;

[0046] 3) Perform a tension test of 15T, and the displacement is less than 3-5mm.

[0047] 3. The lower end of the outer slip connector 7 is installed with the plug 8 to seal the pressure in the oil pipe and ensure the pressure test is qualified.

[0048] 4. The blowout pipe 105, the blowout box 106 and the coiled tubing injection head 3 are hoisted by the crane to the top of the wellhead, the lower end of the blowout pipe 105 is connected with the pressure relief tee 104, and then the installation of the wellhead blowout preventer 1 is completed.

[0049] Step two, the coiled tubing 5 is lowered into the well

[0050] 1. The large-diameter valve 2 is fully opened;

[0051] 2. The coiled tubing 5 is slowly lowered into the well along with the outer slip connector 7 and the plug 8, and after being lowered into the well, the half-sealing gate assembly in the coiled tubing four-gate blowout preventer 102 and the sealing gate assembly in the large-diameter suspension device 103 are closed respectively, and the functionality and sealing are verified, and after the verification is qualified, they are opened;

[0052] 3. The coiled tubing 5 is continuously lowered to the designed depth;

[0053] 4. The slip gate assembly and the half-sealing gate assembly in the coiled tubing four-gate blowout preventer 102 are closed and manually locked, the load of the coiled tubing injection head 3 is slowly released to zero, and the pressure is increased by 1-2T to observe the change of the coiled tubing injection head 3, and if there is no abnormality, the clamping force of the clamping block of the coiled tubing injection head 3 can be released;

[0054] 5. The stopcock valve of the pressure relief tee 104 is used for pressure relief, the sealing is verified to be normal, and the large-diameter suspension device 103 is closed;

[0055] 6. The lower end of the blowout pipe 105 is removed, the coiled tubing injection head 3 is lifted and removed, the coiled tubing 5 is cut by the cutter, and the length of the pipe end is reserved to be more than 0.4 meters;

[0056] 7. The upper end of the coiled tubing 5 is chamfered at 45°, and the load connector 91 is installed.

[0057] 8. The load connector 91 is connected with the tubing hanger 6 through the variable-diameter short connection 92, and the fishing head 46 and the fishing short connection 45 are connected on the tubing hanger 6.

[0058] Step three, the coiled tubing 5 is sent into the tubing hanger 6 and is seated and sealed

[0059] 1. The rivet connector 41, the double-valve-petal check valve 42, the centralizer 43 and the fishing spear 44 are installed in the coiled tubing 5 at the lower end of the coiled tubing injection head 3, and the load of the rivet connector 41 is tested to ensure that the load of the rivet connector 41 is qualified;

[0060] 2, The rivet connector 41, double-valve single-flow valve 42, centralizer 43 and fishing spear 44 are put into the blowout preventer 105 more than 1.2m;

[0061] 3, The blowout preventer 105 is installed on the pressure relief tee 104;

[0062] 4, The coiled tubing 5 is connected to the fishing short 45, and the coiled tubing injector 3 is lifted to the hanging load before the pipe cutting, and the coiled tubing injector 3 is returned to zero after the fishing success is verified;

[0063] Step four, balance the pressure

[0064] 1, Slowly open the balance valve of the coiled tubing four-gate blowout preventer 102 to balance the pressure of the half-sealing gate assembly;

[0065] 2, Slowly open the balance valve of the large-diameter suspension device 103 to balance the pressure of the sealing and clamping gate assembly;

[0066] 3, The coiled tubing injector 3 is lifted to the hanging load before the pipe cutting;

[0067] 4, The half-sealing gate assembly and the slip gate assembly of the coiled tubing four-gate blowout preventer 102 are opened in turn;

[0068] 5, The sealing and clamping gate assembly of the large-diameter suspension device 103 is opened;

[0069] Step five, lower the coiled tubing 5, and seat the tubing hanger 6 to the wellhead large-diameter valve 2, release the lifting load of the coiled tubing injector 3 to zero, and then apply a downward pressure of 1-2T to the coiled tubing 5 to ensure better adhesion of the tubing hanger 6;

[0070] Step six, diagonally lock the tubing hanger 6, verify that the jack is in place, and lock the pressure cap;

[0071] Step seven, the coiled tubing injector 3 applies a lifting load of 15T to the coiled tubing 5, and after observing no abnormalities, the coiled tubing injector 3 load is returned to zero, and the needle valve of the drain tee 101 side outlet is slowly depressurized until the pressure is zero;

[0072] Step eight, press the fishing spear 44, and try to lift the coiled tubing 5 to verify whether the release is successful;

[0073] Step nine, remove all devices above the gas wellhead, and remove the fishing head 46 on the tubing hanger 6 and the fishing short 45;

[0074] Step ten, install the gas production tree, wellhead tubing pressure, and remove the plug 8 at the end of the velocity string body 10.

[0075] The above-described embodiments are merely preferred modes of the present application, and are not intended to limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application as defined by the claims.

Claims

1. A velocity string completion device, characterized by: The application relates to a wellhead blowout preventer (1) connected with a large-diameter valve (2) at the bottom and connected with a coiled tubing injection head (3) at the top. A fishing tool string (4) is arranged in the wellhead blowout preventer (1), the top of the fishing tool string (4) is connected with a coiled tubing (5), the top of the coiled tubing (5) penetrates through the coiled tubing injection head (3) and is connected with a coiled tubing operating machine, and the bottom of the fishing tool string (4) is connected with a tubing hanger (6). A velocity string body (10) is cut off from the coiled tubing (5), the bottom of the velocity string body (10) is connected with a plug (8) through an external slip connector (7), and the top of the velocity string body (10) is connected with the tubing hanger (6) through a connecting tool string (9). The wellhead blowout preventer (1) comprises, from bottom to top, a drainage tee (101), a coiled tubing four-gate blowout preventer (102), a large-diameter hanger device (103), a pressure relief tee (104), a blowout preventer pipe (105) and a blowout preventer box (106), the drainage tee (101) is connected with the large-diameter valve (2), and the blowout preventer box (106) is connected with the coiled tubing injection head (3).

2. The velocity string completion apparatus of claim 1, wherein: An operation platform (107) is further arranged at the top of the pressure relief tee (104).

3. The velocity string completion apparatus of claim 2, wherein: A needle valve is arranged at the side outlet of the drainage tee (101).

4. The velocity string completion apparatus of claim 2, wherein: A balance valve is arranged at the side of the shell of the coiled tubing four-gate blowout preventer (102).

5. The velocity string completion apparatus of claim 2, wherein: A plug valve is arranged at the side outlet of the pressure relief tee (104).

6. The velocity string completion apparatus of claim 2, wherein: The fishing tool string (4) comprises, in sequence, a rivet connector (41), a double-valve-petal check valve (42), a centralizer (43), a fishing spear (44), a fishing short (45) and a fishing head (46), the rivet connector (41) is connected with the coiled tubing (5), and the fishing head (46) is connected with the tubing hanger (6).

7. The velocity string completion apparatus of claim 1, wherein: The connecting tool string (9) comprises a load connector (91) connected with the velocity string body (10), and the load connector (91) is connected with the tubing hanger (6) through a variable-dog short (92).

8. The velocity string completion apparatus of claim 1, wherein: ​

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