Eccentric bushing for oil well testing and dumping type blowout preventer

Abstract

The utility model discloses an eccentric sleeve for oil well testing and a dumping type blowout preventer, and relates to a special wellhead device for oil field underground under-pressure testing. The sliding valve sleeve is inserted into the eccentric sleeve for oil well testing, and the outer wall of the sliding valve sleeve is attached to the inner walls of the eccentric sleeve for oil well testing and the wellhead connector. An adjusting opening penetrating through the eccentric sleeve for oil well testing is formed in the eccentric sleeve for oil well testing in the circumferential direction, and the moving rod is fixedly connected with the sliding valve sleeve. The eccentric shaft mechanism comprises a shaft rear sleeve obliquely and fixedly connected with the eccentric sleeve for oil well testing, the eccentric shaft is rotationally connected with the shaft rear sleeve through a bearing, and the other end of the eccentric shaft is connected with a positioning cap and a testing pipe; after the interior of the test tube is connected with the eccentric sleeve for oil well testing in a vertical line shape, the sliding valve sleeve is pushed to move upwards by pulling the moving rod, and the outer wall of the sliding valve sleeve is attached to the inner wall of the test tube; the relative position of the test tube is limited through the sliding valve sleeve, the position of the test tube is fixed and does not rotate any more, and the device has the advantages that the test tube topples over relative to the Christmas tree in two modes, and operation is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the special wellhead device of oil field downhole pressure test, especially relates to a eccentric sleeve for oil well test and dump type blowout preventer. BACKGROUND

[0002] The wellhead blowout preventer is the wellhead safety device that oil field has put into production oil well carries out downhole test or operation when must use.In carrying out oil well test operation, according to the connection order of the component in blowout preventer on the wellhead Christmas tree, the installation of each component is carried out from bottom to top, in turn is blowout preventer, downhole tool or instrument, blowout control head, sky pulley, wherein downhole tool or instrument must be connected with the cable or steel wire that passes through blowout control head in advance on the ground, after the installation of blowout preventer, cable or steel wire is dragged and is placed in blowout preventer, then the installation of blowout control head that cable or steel wire is dragged is carried out, finally the installation and relevant connection of sky pulley are carried out, the valve on Christmas tree is opened, and instrument can be lowered into the well from blowout preventer;Conversely, the instrument or downhole tool must be hoisted to blowout preventer first, the valve on Christmas tree is closed, the high-pressure well fluid or gas in blowout preventer is released, and then the dismounting operation contrary to the installation order is carried out.In the whole operation process, blowout preventer provides a special channel for downhole tool, and prevents the ejection of well fluid.

[0003] During the installation or dismounting of blowout preventer, due to the length, weight and structure of equipment and other factors, the field operation personnel

[0004] Must carry out multiple climbing operations to complete the corresponding operation, and these operations have considerable operation difficulty, great labor intensity, and certain safety risk.Under the limitation of field operation conditions or the requirement of too long construction operation tool, the use of crane has high operation cost, and some well construction operations are difficult to carry out, which brings considerable influence to oil field production.

[0005] The utility model discloses a practical new type patent with the application date of March 31, 1998, the patent number of 98208749.7 and the name of "multifunctional wellhead blowout preventer", discloses a dumpable blowout preventer, which realizes the arbitrary dumping operation of blowout preventer relative to Christmas tree within 90 degrees angle by adopting worm gear pair loose joint structure, and the operator can carry out relevant operation under the condition that the blowout preventer is dumped to be horizontal, and the operation and adjustment are very convenient.The subsequent applicant has applied for several patents on the basis of the above-mentioned two patent products, including the patent with the application date of May 25, 2010, the name of oil well test dump type blowout preventer and the application number of 201020213578.2, which is convenient, safe and reliable, and improves operation efficiency.The present application is improved on the basis of the above-mentioned two patent products, and provides an oil well test dump type blowout preventer, wherein the test pipe can be dumped relative to Christmas tree in two ways, and the sliding valve sleeve is arranged, so that the sealing performance is better. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide an eccentric sleeve and a tilting blowout preventer for oil well testing, in which the test tube can be tilted relative to the Christmas tree in two ways, facilitating subsequent maintenance or operation after tilting, and by setting a sliding valve sleeve, better sealing performance can be achieved.

[0007] The technical solution of the present utility model is as follows:

[0008] A tilting blowout preventer for oil well testing, comprising:

[0009] A wellhead connector, the interior of which is in an inverted "convex" shape with a thick upper part and a thin lower part. The lower end of the wellhead connector is fixedly connected to the oil well Christmas tree wellhead by threads and forms a threaded seal.

[0010] Further, a vent valve is provided on the circumferential surface of the wellhead connector, and the vent valve is located in the thick section and near the junction of the thick and thin parts.

[0011] Further, the vent valve consists of a vent valve core, a valve core baffle, and an O-ring. When the vent valve core discharges well fluid, the valve plays a role in introducing air and discharging all the well fluid.

[0012] An eccentric sleeve for oil well testing, the upper end of the wellhead connector is inserted into the eccentric sleeve for oil well testing and then fixed. The sliding valve sleeve is inserted into the eccentric sleeve for oil well testing and the wellhead connector. The outer wall of the sliding valve sleeve is closely fitted with the inner walls of the eccentric sleeve for oil well testing and the wellhead connector. The length of the sliding valve sleeve is equal to or shorter than the distance from the top surface of the eccentric sleeve for oil well testing to the bottom end of the middle thick section inside the wellhead connector. An adjustment port penetrating the eccentric sleeve for oil well testing is provided in the circumferential direction of the eccentric sleeve for oil well testing. A moving rod penetrates through the adjustment port and is fixedly connected to the sliding valve sleeve. The sliding valve sleeve can be pushed to move up, down, left, and right through the moving rod.

[0013] Further, the internal channel plane of the eccentric sleeve for oil well testing is in a "convex" shape, including a limiting section with a thin upper part in a cylindrical shape and an operating section with a thick lower part in a cylindrical shape. The upper end of the wellhead connector is inserted into the operating section and then fixed. There is a gap between the top surface of the wellhead connector and the bottom surface of the limiting section. The outer wall of the sliding valve sleeve is closely fitted with the inner walls of the limiting section and the wellhead connector. The gap between the outer wall of the sliding valve sleeve and the inner wall of the operating section is an adjustment space. The length of the sliding valve sleeve is equal to or shorter than the distance from the top surface of the eccentric sleeve for oil well testing to the bottom end of the middle thick section inside the wellhead connector. An adjustment port penetrating the operating section is provided in the circumferential direction of the operating section of the eccentric sleeve for oil well testing.

[0014] Further, the adjustment port is in a "work" shape.

[0015] Further, the pull handle and the plug seat are connected at an acute angle or a right angle or an obtuse angle, the intersection of the pull handle and the plug seat is rotationally fixed on the outer circumferential surface of the eccentric sleeve for oil well testing through a pin shaft, and the pull handle and the plug seat rotate around the pin shaft, the other end of the plug seat is provided with a notch, and the moving rod is arranged in the notch;

[0016] Further, the adjusting space is provided with a sealing ring, and the sealing ring is fixed between the operation section and the sliding valve sleeve;

[0017] Further, the righting stopper is fixedly connected with the outer wall of the sliding valve sleeve, and the righting stopper abuts against the bottom surface of the limiting section and the internal connection part of the wellhead joint to limit the up-down movement distance of the sliding valve sleeve;

[0018] The eccentric shaft mechanism comprises a shaft rear sleeve fixedly connected with the eccentric sleeve for oil well testing, one end of the eccentric shaft is rotationally connected with the shaft rear sleeve through a bearing, the other end of the eccentric shaft is fixedly connected with one end of a positioning cap, and the other end of the positioning cap is fixedly connected with a test pipe.

[0019] Further, the other end of the positioning cap and the edge of the test pipe are provided with a hand knob, the hollow part of the test pipe is communicated with the eccentric sleeve for oil well testing by rotating the hand knob, and the internal passage after communication is in the shape of “|”.

[0020] The circumferential surface of the positioning cap is provided with a large gear, the shaft rear sleeve is fixedly connected with a fixed plate, the top of the fixed plate is provided with a housing, the housing is provided with a transmission mechanism, the transmission shaft of the transmission mechanism extends out of the housing and is fixedly connected with a small gear, the small gear is engaged with the large gear, the transmission shaft, the small gear and the large gear are rotated by the transmission mechanism, the large gear is integrated with the positioning cap, so that the positioning cap is further rotated to drive the test pipe to rotate, the hollow part of the test pipe is communicated with the eccentric sleeve for oil well testing, and the internal passage after communication is in the shape of “|”.

[0021] Further, the test pipe is rotated by 116° when the large gear is rotated by 180°, at this time, the hollow part of the test pipe is communicated with the eccentric sleeve for oil well testing, and the internal passage after communication is in the shape of “|”.

[0022] Further, the angle of rotation of the test pipe can be limited by arranging a supporting stopper, and preferably, the test pipe is at 90° with the wellhead joint when falling;

[0023] Further, the transmission mechanism is a motor, the motor is arranged in the housing, and the motor is provided with a transmission shaft.

[0024] Further, the reducer is fixed in the housing, the reducer is connected with the motor through the shaft coupling, the output torque is increased and the inertia of the load is reduced by the reducer while reducing the rotating speed;

[0025] Further, when the test pipe is connected with the eccentric sleeve in the shape of "I", the outer wall of the sliding valve sleeve is attached to the inner wall of the test pipe by pushing the sliding valve sleeve upward through the moving rod, the relative position of the test pipe is limited by the sliding valve sleeve, the position of the test pipe is fixed and no longer rotates, and the sealing property between the eccentric sleeve and the test pipe is enhanced by the sliding valve sleeve;

[0026] Further, the sealing ring is arranged between the outer wall of the sliding valve sleeve and the inner wall of the test pipe, and a plurality of sealing rings are preferably arranged.

[0027] The positioning cap is fixed on the eccentric shaft through the positioning fixing screw. The friction resistance of the eccentric shaft is reduced through the bearing. The O-shaped sealing ring is arranged between the eccentric shaft and the shaft rear sleeve to prevent the high pressure in the blowout preventer from leaking.

[0028] The drop preventer housing is inserted into and fixedly connected to the test pipe, the top end of the drop preventer housing is provided with a blowout preventer, and the drop preventer housing is circumferentially provided with a ground pulley.

[0029] Further, the drop preventer housing is provided with a downhole instrument string, the downhole instrument string is limited on the upper part of the drop preventer and cannot fall into the test pipe on the lower part of the drop preventer.

[0030] Further, the drop preventer is fixedly connected to the flange of the outer gate of the drop preventer housing in the following way, the flange is fixed outside the drop preventer housing, the mandrel is inserted into the flange outside the drop preventer, and the fixing mode of the two sides of the mandrel is the same, specifically, the drop preventer comprises a mandrel, the outer circumferential surface of the mandrel is provided with a sealing plug, the sealing plug is arranged in a fixed block I, the flange is provided with a fixed block I, one end of the sealing plug is provided with a convex-shaped clamping block, the clamping block is clamped on the fixed block I, so the clamping block cannot move towards the center hole of the drop preventer housing, one end of the fixed block II is embedded with the clamping block, the other end of the fixed block II is in the shape of "T", the one end of the limiting block which is in the shape of "convex" and hollow is abutted against the fixed block II in the shape of "T", and the other end of the limiting block is abutted against the sealing plug, so the limiting block is limited between the fixed block II and the sealing plug, a spring is arranged between the limiting block and the fixed block II, the limiting block is connected with the fixed block II through a plurality of screws in the circumferential direction, the two ends of the mandrel are fixed in the limiting block through a gasket and a nut, and the two end faces of the mandrel are located in the fixed block II.

[0031] Preferably, a plurality of sealing rings are provided between the mandrel and the sealing plug.

[0032] Furthermore, the anti-falling device is purchased on the market. Specifically, in terms of the optional structure, in addition to the mandrel, it further includes a pull tab, a hollow cylindrical tube, a spring, and a pull tab handle. The pull tab is the main supporting part of the anti-falling device, including a platform and holes on the platform arranged inside the housing of the anti-falling device. The holes are for the lines in the downhole instrument string to pass through and be sealed, and it is "U"-shaped.

[0033] The pull tab is fixedly connected to the hollow cylindrical tube, and the hollow cylindrical tube is fixedly connected to the mandrel and can rotate within a certain angle range to block the downward movement of the downhole instrument string. The lower part of the hollow cylindrical tube is provided with a boss and a through hole, a groove is provided in the middle part, and a hole is provided at the upper end.

[0034] Mandrel: It passes through the hole in the hollow cylindrical tube, and the pull tab rotates along the mandrel within a certain angle range to further drive the rotation of the pull tab.

[0035] Spring: It is installed at the bottom of the pull tab and fastened by screws to provide a thrust to horizontally place the pull tab, thereby playing a blocking role.

[0036] Pull tab handle: It is fixedly connected to the limit block and is used to overcome the spring force to adjust the pull tab to a vertical state so that the downhole instrument string can be smoothly lowered into the well.

[0037] The advantages and positive effects of the present utility model are:

[0038] By using the eccentric sleeve for oil well testing with this structure, since a sliding valve sleeve is provided inside the eccentric sleeve for oil well testing, therefore, when in the traditional tilting blowout preventer and the tilting blowout preventer of the present application, after the test pipe is connected to the eccentric sleeve for oil well testing to form a "|" shape, by掰动所述移动杆推动滑动阀套向上移动,则滑动阀套外壁与测试管内壁贴合;通过滑动阀套不仅限制测试管的相对位置,使所述测试管的位置被固定不再旋转,且通过滑动阀套增强了油井测试用偏心套与测试管之间的密封性。

[0039] Since the adjustment port is "I"-shaped, it is convenient to be stuck above or below the adjustment port after adjustment, facilitating the fixation of the position of the sliding valve sleeve.

[0040] Since sealing rings are provided in the adjustment space, the sealing performance is improved. Since a扶正挡块 is provided in the adjustment space, the up and down movement distance of the sliding valve sleeve is restricted by the扶正挡块抵在限位段底面、井口接头内部粗细衔接处.

[0041] It should be noted that there seems to be some incorrect or unclear expressions in the original text, such as "掰动所述移动杆" which is not clearly defined before. This translation is based on the existing text as accurately as possible.The convenience of operation is improved by setting the pull handle, and the pull handle is connected with the plug seat at an acute angle or a right angle or an obtuse angle, the other end of the plug seat is provided with a notch, and the moving rod is arranged in the notch, so that the position of the sliding valve sleeve is fixed.

[0042] In the oil well testing pouring type blowout preventer, the vent valve is arranged on the wellhead joint, and when the well fluid is discharged, the valve plays the role of air inlet, and all the well fluid is discharged.

[0043] The test pipe and the eccentric sleeve for oil well testing are communicated in the "I" type mode in two modes, one is manual and the other is electric. The manual method is to directly move the handle, so that the large gear and the small gear are engaged, and the test pipe and the eccentric sleeve for oil well testing are communicated in the "I" type mode. The other is electric, the motor drives the transmission shaft to drive the small gear to rotate, the large gear and the positioning cap are integrated, so that the positioning cap rotates to further drive the test pipe to rotate, the hollow part in the test pipe is communicated with the eccentric sleeve for oil well testing, and the internal passage after communication is in the "I" type. Through the above two modes, the test pipe and the eccentric sleeve for oil well testing can be communicated or the test pipe can be lowered. When communication, well logging operation is carried out, and when the test pipe is lowered, the staff can stand on the ground to load or unload downhole instruments and related operations without climbing, and 1-2 people can complete the work, saving manpower and cost. Through the structure, the structure is more light and convenient to operate.

[0044] The angle between the test pipe and the eccentric sleeve for oil well testing can be adjusted at any angle manually or electrically, so that the blowout preventer in the whole blowout preventer can be tilted relative to the Christmas tree for any dumping operation. For example, when the large gear 14 rotates 180°, the test pipe is driven to rotate 116°. At this time, the hollow part in the test pipe is communicated with the eccentric sleeve for oil well testing, and the internal passage after communication is in the "I" type. During the installation process of the oil well wellhead blowout preventer system, the operator can dump the blowout preventer to the horizontal plane, and stand on the ground to load or unload downhole instruments and related operations without climbing or using a crane for auxiliary operation. The whole device is convenient, safe and reliable, improves the operation efficiency, reduces the construction requirements and labor intensity, is suitable for oil and water well production monitoring, fishing tool operation, has good economic performance and high application value.

[0045] The bearing reduces the friction resistance when the eccentric shaft rotates. The reducer reduces the rotating speed while increasing the output torque and reducing the inertia of the load. The sealing ring fixed to the inner wall of the test pipe is arranged between the outer wall of the sliding valve sleeve and the inner wall of the test pipe, so that the sealing property is enhanced to prevent high pressure leakage in the blowout preventer.

[0046] The downhole instrument string is limited on the upper part of the anti-drop device and cannot fall into the test pipe in the lower part of the anti-drop device, and the anti-drop effect is achieved.

[0047] Through the fixing mode of the anti-dropping device in the application, the sealing is better and more firm. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is the rear perspective view of the oil well testing dumping type blowout preventer of the utility model, wherein the testing pipe and the eccentric sleeve for oil well testing are not on a straight line.

[0049] Figure 2 is the front perspective view of the oil well testing dumping type blowout preventer of the utility model, wherein the testing pipe and the eccentric sleeve for oil well testing are not on a straight line.

[0050] Figure 3 is the plan view of the eccentric sleeve for oil well testing and the testing pipe not on a straight line in the oil well testing dumping type blowout preventer of the utility model.

[0051] Figure 4 is the plan view of the eccentric sleeve for oil well testing and the testing pipe on a straight line in the oil well testing dumping type blowout preventer of the utility model.

[0052] Figure 5 is the plan view of the eccentric sleeve for oil well testing and the testing pipe on a straight line, wherein in the circle A in the upper right corner, the corresponding is the internal structure diagram in the circle pointed by the other end of the arrow.

[0053] In the drawing:

[0054] 1, wellhead joint; 2, eccentric sleeve for oil well testing; 3, sliding valve sleeve;

[0055] 4, moving rod; 5, adjusting port; 6, pull plate handle;

[0056] 7, plug-in seat; 8, sealing ring; 9, centralizing stop block;

[0057] 10, shaft rear sleeve; 11, positioning cap; 12, testing pipe;

[0058] 13, hand lever handle; 14, large gear; 15, fixed plate;

[0059] 16, shell; 17, small gear; 18, speed reducer;

[0060] 19, anti-dropping device shell; 20, blowout pipe; 21, ground pulley;

[0061] 22, downhole instrument string; 23, mandrel; 24, sealing plug;

[0062] 25, fixed block I; 26, fixed block II; 27, limiting block;

[0063] 28. Spring; 29. Bleed-off valve; 30. Eccentric shaft;

[0064] 2-1. Limit section; 2-2. Operation section; 31. Anti-drop device. Specific embodiments

[0065] The following further describes the specific embodiments of the present utility model in conjunction with the accompanying drawings.

[0066] An oil well testing tipping blowout preventer device of the present utility model is an improvement based on the patents with application numbers 98208749.7 and 20213578.2 previously applied by the applicant. This application mainly changes the structure of the eccentric sleeve 2 for oil well testing. The following mainly introduces the points of this improvement in detail. For parts not mentioned during use, the components and structures in 98208749.7 and 20213578.2 are adopted. As shown in the present application Figures 1-4 As shown, this embodiment includes from bottom to top:

[0067] As Figure 3 , Figure 4 shown, a wellhead joint 1, the inside of the wellhead joint 1 is in an inverted "convex" shape with a thick upper part and a thin lower part, and the lower end of the wellhead joint 1 is fixedly connected to the production tree wellhead through threads and forms a thread seal;

[0068] Further, a bleed-off valve 29 is provided on the circumferential surface of the wellhead joint 1, and the bleed-off valve 29 is located in the thick section and near the connection between the thick and thin parts;

[0069] Further, the bleed-off valve 29 is composed of a bleed-off valve core, a valve core baffle, and an O-ring. When the bleed-off valve core discharges well fluid, the valve plays a role in introducing air and discharges all the well fluid.

[0070] As Figure 3 , Figure 4 shown, an eccentric sleeve 2 for oil well testing. The upper end of the wellhead joint 1 is inserted into the eccentric sleeve 2 for oil well testing and then fixed. The sliding valve sleeve 3 is inserted into the eccentric sleeve 2 for oil well testing and the wellhead joint 1. The outer wall of the sliding valve sleeve 3 is in close contact with the inner walls of the eccentric sleeve 2 for oil well testing and the wellhead joint 1. The length of the sliding valve sleeve 3 is equal to or shorter than the distance from the top surface of the eccentric sleeve 2 for oil well testing to the bottom end of the middle thick section inside the wellhead joint 1; An adjustment port 5 penetrating the eccentric sleeve 2 for oil well testing is provided in the circumferential direction of the eccentric sleeve 2 for oil well testing. A moving rod 4 penetrates through the adjustment port 5 and is fixedly connected to the sliding valve sleeve 3. The sliding valve sleeve 3 can be pushed to move up, down, left, and right through the moving rod 4;

[0071] Furthermore, the internal channel of the eccentric sleeve 2 for oil well testing is convex in shape, including a cylindrical limiting section 2-1 that is thinner at the top and a cylindrical operating section 2-2 that is thicker at the bottom. The upper end of the wellhead connector 1 is inserted into the operating section 2-2 and fixed. There is a gap between the top surface of the wellhead connector 1 and the bottom surface of the limiting section 2-1. The outer wall of the sliding valve sleeve 3 is tightly fitted with the inner wall of the limiting section 2-1 and the wellhead connector 1. The gap between the outer wall of the sliding valve sleeve 3 and the inner wall of the operating section 2-2 is an adjustment space. The length of the sliding valve sleeve 3 is equal to or shorter than the distance from the top surface of the eccentric sleeve 2 for oil well testing to the bottom end of the thicker section inside the wellhead connector 1. The operating section 2-2 in the eccentric sleeve 2 for oil well testing is provided with an adjustment port 5 that penetrates the operating section 2-2 around its circumference.

[0072] Furthermore, the adjustment port 5 is in the shape of an "I";

[0073] Furthermore, such as Figure 1 , Figure 2 The pull plate handle 6 and the insertion seat 7 are connected at an acute angle, a right angle or an obtuse angle. The intersection of the pull plate handle 6 and the insertion seat 7 is fixed to the outer circumferential surface of the oil well test eccentric sleeve 2 at the side of the adjustment port 5 by a pin. The pull plate handle 6 and the insertion seat 7 rotate around the pin. The other end of the insertion seat 7 is provided with a notch, and the moving rod 4 is set in the notch.

[0074] Furthermore, such as Figure 3 , Figure 4 The adjustment space shown is provided with a sealing ring 8, which is fixed between the operating section 2-2 and the sliding valve sleeve 3;

[0075] Furthermore, the straightening block 9 is fixedly connected to the outer wall of the sliding valve sleeve 3, and the straightening block 9 abuts against the bottom surface of the limiting section 2-1 and the thick and thin joint inside the wellhead connector 1 to limit the vertical movement distance of the sliding valve sleeve 3.

[0076] Eccentric shaft 30 mechanism, such as Figure 3 , Figure 4 As shown, it includes a rear shaft sleeve 10 that is obliquely and fixedly connected to the eccentric sleeve 2 for oil well testing. One end of the eccentric shaft 30 is rotatably connected to the rear shaft sleeve 10 via a bearing. Figure 1 , Figure 2 The other end of the eccentric shaft 30 is fixedly connected to one end of the positioning cap 11, and the other end of the positioning cap 11 is fixedly connected to the test tube 12. The test tube 12 is hollow inside and communicates with the eccentric sleeve 2 for oil well testing. The positioning cap 11 is fixed to the eccentric shaft 30 by positioning screws. The bearing reduces the frictional resistance when the eccentric shaft 30 rotates. An O-ring seal 8 is provided between the eccentric shaft 30 and the rear sleeve 10 to provide a seal and prevent high-pressure leakage from the blowout preventer 20.

[0077] Further, the transmission mechanism we use is the motor, the motor is provided in the shell 16, the motor is provided with a transmission shaft; we also set up the reducer 18 is fixed in the shell 16, the reducer 18 is connected with motor through the shaft coupling, through the reducer 18 in reducing the speed at the same time, increase the output torque, and reduce the load inertia;

[0078] Further, when the test pipe 12 inside and oil well testing eccentric sleeve 2 is connected with the "I" type, through the move lever 4 push the slide valve sleeve 3 to move up, the slide valve sleeve 3 outer wall and test pipe 12 inner wall fit; through the slide valve sleeve 3 not only limit the relative position of test pipe 12, make the test pipe 12 position is fixed no longer rotate, and through the slide valve sleeve 3 enhances the sealing between the oil well testing eccentric sleeve 2 and test pipe 12, the slide valve sleeve 3 outer wall and test pipe 12 inner wall between the sealing ring 8 fixed in the test pipe 12 inner wall, further improve the sealing;

[0079] By using the structure of the oil well testing eccentric sleeve 2, because the oil well testing eccentric sleeve 2 is provided with slide valve sleeve 3, when the traditional dump type blowout preventer and the dump type blowout preventer of the application, test pipe 12 and oil well testing eccentric sleeve 2 communication is "I" type, through the move lever 4 push the slide valve sleeve 3 to move up, the slide valve sleeve 3 outer wall and test pipe 12 inner wall fit; through the slide valve sleeve 3 not only limit the relative position of test pipe 12, make the test pipe 12 position is fixed no longer rotate, and through the slide valve sleeve 3 enhances the sealing between the oil well testing eccentric sleeve 2 and test pipe 12, the oil well testing eccentric sleeve 2 of the application can be used in the application, also can be used in the application number 98208749.7, 201020213578.2 and the dump type blowout preventer on the market.

[0080] As shown in Figure 4 Again up, the anti falling device shell 19 bottom is inserted into the test pipe 12 and fixedly connected, the top of the anti falling device shell 19 is provided with the blowout pipe 20, the anti falling device shell 19 is provided with the ground pulley 21;

[0081] Further, the anti falling device shell 19 is provided with the downhole instrument string 22, the downhole instrument string 22 is limited on the anti falling device 31 upper part and cannot fall into the test pipe 12 in the anti falling device 31 lower part through the anti falling device 31;

[0082] Preferably, as shown in Figure 5As shown, the anti-falling device 31 is fixedly connected to the flange of the outer gate of the anti-falling device housing 19 by the following manner: the core shaft 23 is inserted into the flange outside the anti-falling device 31, and the fixing manner of the core shaft 23 on both sides is the same. Specifically, the anti-falling device 31 comprises the core shaft 23, the outer circumferential surface of the core shaft 23 is provided with a sealing plug 24, the sealing plug 24 is arranged in a fixed block I 25, the flange is provided with the fixed block I 25, one end of the sealing plug 24 is provided with a card block in the shape of a convex character, the card block is clamped on the fixed block I 25, so that the card block cannot move towards the center hole of the anti-falling device housing 19, one end of the fixed block II 26 is embedded with the card block, the other end of the fixed block II 26 is in the shape of a "T" character, the limiting block 27 in the shape of a "convex" character and hollow inside abuts against the "T" shaped fixed block II 26 on one end, and abuts against the sealing plug 24 on the other end, so that the limiting block 27 is limited between the fixed block II 26 and the sealing plug 24, and a spring 28 is arranged between the limiting block 27 and the fixed block II 26, the limiting block 27 is connected with the fixed block II 26 through a plurality of screws in the circumferential direction, the core shaft 23 is fixed in the limiting block 27 through a gasket and a nut, and the two end surfaces of the core shaft 23 are located in the fixed block II 26; a plurality of sealing rings 8 are arranged between the core shaft 23 and the sealing plug 24; in addition to the above structure, the fixing manner of the anti-falling device 31 can also adopt the manner in the previous patent application of the applicant or the general manner on the market, which is not limited in detail this time.

[0083] Further, the anti-falling device 31 is purchased on the market, and therefore the application provides the drawings, and the specific structure can be selected, which is on the market and in addition to the core shaft 23, further comprises a pull piece, a hollow cylindrical pipe, a spring 28, and a pull piece handle. The pull piece is the main supporting part of the anti-falling device 31, which comprises a platform arranged inside the anti-falling device housing 19 and a hole on the platform, the hole is provided for the lines in the downhole instrument string 22 to pass through and is sealed, and is in the shape of a "U". The pull piece is fixedly connected with the hollow cylindrical pipe, the hollow cylindrical pipe is fixedly connected with the core shaft 23, and can rotate within a certain angle range, and is used to block the downhole instrument string 22 from descending. The lower part of the hollow cylindrical pipe is provided with a boss and a through hole, the middle part is provided with a groove, and the upper end is provided with a hole. The core shaft 23 passes through the hole of the hollow cylindrical pipe, the pull piece rotates within a certain angle range along the core shaft 23, and further drives the pull piece to rotate. The spring 28 is installed at the bottom of the pull piece and is fastened by a screw, provides a pushing force to make the pull piece horizontally placed, thereby playing a blocking role. The pull piece handle is fixedly connected with the limiting block 27, is used to overcome the elastic force of the spring 28, adjusts the pull piece to be in a vertical state, so that the downhole instrument string 22 can be smoothly lowered into the well;

[0084] In use, the application has two modes of communication between the test tube 12 and the eccentric sleeve 2 for oil well testing, which are "I" type or test tube 12 drooping mode, so as to realize the function requirements of the well downhole tool and blowout preventer disassembly operation on the test tube 12 on the flat ground, and the vertical operation of the well downhole tool and blowout preventer.

[0085] Specifically, one is manual and the other is electric, wherein, Figure 1 、 Figure 1 、 Figure 3 For the dumping mode, the test tube 12 and the eccentric sleeve 2 for oil well testing are not in a straight line, Figure 2 For the test tube 12 and the eccentric sleeve 2 for oil well testing, the communication is "I" type.

[0086] Specifically, the manual method is to directly move the hand lever handle 13, so that the large gear 14 and the small gear 17 are engaged, until the test tube 12 and the eccentric sleeve 2 for oil well testing are communicated as "I" type, and specifically, Figure 1 、 Figure 2 As shown in the drawings, the other end of the positioning cap 11 and the edge of the test tube 12 are provided with a hand lever handle 13, by rotating the hand lever handle 13, the hollow part inside the test tube 12 and the eccentric sleeve 2 for oil well testing are communicated, and the internal passage after communication is "I" type;

[0087] The other is electric, combined with Figures 1-4 As shown in the drawings, the positioning cap 11 is provided with a large gear 14, the shaft rear sleeve 10 is fixedly connected with a fixed plate 15, the top of the fixed plate 15 is provided with a housing 16, the housing 16 is provided with a transmission mechanism, the transmission shaft in the transmission mechanism extends out of the housing 16 and is fixed with a small gear 17, the small gear 17 is engaged with the large gear 14, the large gear 14 and the positioning cap 11 are integrated, so that the positioning cap 11 is further rotated to drive the test tube 12 to rotate, the hollow part inside the test tube 12 and the eccentric sleeve 2 for oil well testing are communicated, and the internal passage after communication is "I" type.

[0088] The application can communicate or test tube 12 drooping through the above two modes, communicate when carrying out logging operation, and personnel standing on the ground can carry out the operation of loading or taking out downhole instrument and related operation when drooping, without climbing, 1-2 people can complete the work, saving manpower and cost, and through the structure, the structure is more light, and more convenient to operate.

[0089] At present, the specification we use is:

[0090] Further, the angle of rotation of the test tube 12 can be limited by setting a supporting block, at present, the test tube 12 and the wellhead joint 1 are 90° when falling;

[0091] In addition, the included angle between the test pipe 12 and the eccentric sleeve 2 for oil well testing can be adjusted at will by manual or electric operation, so that the blowout prevention device in the whole blowout prevention pipe 20 can be tilted relative to the Christmas tree at will, for example, when the large gear 14 rotates 180°, the test pipe 12 is driven to rotate 116°, at this time, the hollow part inside the test pipe 12 is communicated with the eccentric sleeve 2 for oil well testing, and the internal passage after communication is in the shape of "I", in the process of installing the blowout prevention system at the wellhead, the operator can tilt the blowout prevention device below the horizontal plane, stand on the ground to load or unload the downhole instrument and related operation, without climbing operation or auxiliary operation by using the crane. The whole device is convenient, safe and reliable, improves the operation efficiency, reduces the construction requirements and labor intensity, is suitable for oil and water well production monitoring, fishing tool and other construction operations, has good economic performance, and has high application value.

[0092] The above describes one embodiment of the utility model in detail, but the content described is only the preferred embodiment of the utility model, and cannot be considered as limiting the implementation scope of the utility model. Any equivalent change and improvement within the scope of the utility model application should still belong to the patent coverage of the utility model.

Claims

1. An eccentric casing for use in testing an oil well, characterized by: The sliding valve sleeve is inserted into the eccentric sleeve for oil well testing and the wellhead joint, the outer wall of the sliding valve sleeve is tightly combined with the inner wall of the eccentric sleeve for oil well testing and the wellhead joint, the length of the sliding valve sleeve is equal to or shorter than the distance from the top surface of the eccentric sleeve for oil well testing to the bottom end of the middle thick section inside the wellhead joint; the eccentric sleeve for oil well testing is provided with an adjusting port penetrating the eccentric sleeve for oil well testing in the circumferential direction, and the moving rod is fixedly connected with the sliding valve sleeve through the adjusting port, and the sliding valve sleeve is pushed up, down, left and right by the moving rod.

2. An eccentric casing for use in testing an oil well as defined in claim 1, characterized in that: The internal passage of the eccentric sleeve for oil well testing is in the shape of "a convex" on the plane, including an upper thin limiting section in the shape of a cylinder and a lower thick operating section in the shape of a cylinder, the upper end of the wellhead joint is inserted into the operating section and is fixed, the top surface of the wellhead joint has a spacing from the bottom surface of the limiting section, the outer wall of the sliding valve sleeve is tightly combined with the inner wall of the limiting section and the wellhead joint, the spacing between the outer wall of the sliding valve sleeve and the inner wall of the operating section is an adjusting space, the length of the sliding valve sleeve is equal to or shorter than the distance from the top surface of the eccentric sleeve for oil well testing to the bottom end of the middle thick section inside the wellhead joint; the operating section of the eccentric sleeve for oil well testing is provided with an adjusting port penetrating the operating section in the circumferential direction.

3. An eccentric casing for use in testing an oil well as defined in claim 2, characterized in that: The adjusting port is in the shape of "a Chinese character Gong".

4. An eccentric casing for use in testing an oil well as defined in claim 3, characterized in that: The pull plate handle is connected with the plug-in seat at an acute angle or a right angle or an obtuse angle, the intersection of the pull plate handle and the plug-in seat is rotationally fixed on the outer circumferential surface of the eccentric sleeve for oil well testing at the edge of the adjusting port through a pin shaft, and the pull plate handle and the plug-in seat rotate around the pin shaft, the other end of the plug-in seat is provided with a notch, and the moving rod is arranged in the notch.

5. An oil well test flowline blowout preventer, comprising: It comprises: a wellhead joint and the eccentric sleeve for oil well testing as claimed in any one of claims 1-4, the upper end of the wellhead joint is inserted into the eccentric sleeve for oil well testing and is fixed; an eccentric shaft mechanism, comprising a shaft rear sleeve fixedly connected with the eccentric sleeve for oil well testing at an angle, one end of the eccentric shaft is rotationally connected with the shaft rear sleeve through a bearing, the other end of the eccentric shaft is fixedly connected with one end of a positioning cap, the other end of the positioning cap is fixedly connected with a test pipe, the test pipe is hollow inside and is in communication with the eccentric sleeve for oil well testing; the test pipe is hollow inside and is in communication with the eccentric sleeve for oil well testing, and the internal passage after the communication is in the shape of "a Chinese character Yi"; when the test pipe is connected with the eccentric sleeve for oil well testing in the shape of "a Chinese character Yi", the sliding valve sleeve is pushed up by moving the moving rod, and the outer wall of the sliding valve sleeve is combined with the inner wall of the test pipe; the sliding valve sleeve not only limits the relative position of the test pipe, but also fixes the position of the test pipe so that the test pipe no longer rotates.

6. An oil well testing flowline preventer according to claim 5, characterized in that: the other end of the positioning cap and the edge of the test pipe are provided with a hand knob, and the test pipe is hollow inside and is in communication with the eccentric sleeve for oil well testing by rotating the hand knob, and the internal passage after the communication is in the shape of "a Chinese character Yi".

7. An oil well testing flowline preventer according to claim 5 or 6, characterized in that: The positioning cap peripheral surface is provided with a large gear, the shaft rear sleeve is fixedly connected with a fixed plate, the top of the fixed plate is provided with a shell, a transmission mechanism is arranged in the shell, a transmission shaft in the transmission mechanism extends out of the shell and is fixedly connected with a small gear, the small gear is engaged with the large gear, the transmission mechanism drives the transmission shaft, the small gear and the large gear to rotate, the large gear is integrated with the positioning cap, so that the rotation of the positioning cap further drives the test tube to rotate, the hollow part in the test tube is communicated with the eccentric sleeve for oil well testing, and the internal passage after communication is in the shape of "I".

8. An oil well testing flowline preventer according to claim 7, characterized in that: Whenever the large gear rotates by 180°, the test tube is driven to rotate by 116°, at this time, the hollow part in the test tube is communicated with the eccentric sleeve for oil well testing, and the internal passage after communication is in the shape of "I".

9. An oil well testing flowline preventer according to claim 8, characterized in that: The anti-falling device shell is inserted into the test tube and fixedly connected, the top end of the anti-falling device shell is provided with an anti-spray pipe, and the anti-falling device shell is circumferentially provided with a ground pulley. A downhole instrument string is arranged in the anti-falling device shell, the downhole instrument string is limited on the upper part of the anti-falling device and cannot fall into the test tube on the lower part of the anti-falling device. The anti-falling device is fixedly connected to the flange of the outer gate of the anti-falling device shell by the following way, the flange is fixed on the anti-falling device shell, a mandrel is inserted into the flange outside the anti-falling device, and the fixing ways of the two sides of the mandrel are the same, specifically, the anti-falling device comprises a mandrel, the outer peripheral surface of the mandrel is provided with a sealing plug, the sealing plug is arranged in a fixed block I, the flange is provided with a fixed block I, one end of the sealing plug is provided with a convex-shaped clamping block, the clamping block is clamped on the fixed block I, so that the clamping block cannot move towards the center hole of the anti-falling device shell, one end of a fixed block II is embedded with the clamping block, the other end of the fixed block II is in the shape of "T", the one end of a hollow limiting block in the shape of "convex" is abutted against the fixed block II in the shape of "T", and the other end is abutted against the sealing plug, so that the limiting block is limited between the fixed block II and the sealing plug, a spring is arranged between the limiting block and the fixed block II, the limiting block is connected with the fixed block II through a plurality of screws in the circumferential direction, and the two ends of the mandrel are fixed in the limiting block through a gasket and a nut, and the two end faces of the mandrel are located in the fixed block II.

10. The oil well testing toppling type blowout preventer according to claim 9, wherein: The internal part of the wellhead joint is in the shape of "convex" with the top being thick and the bottom being thin and upside down, the lower end of the wellhead joint is fixedly connected with the wellhead of the Christmas tree through a thread and a thread seal is formed.

11. An oil well testing flowline preventer according to claim 9, characterized in that: The peripheral surface of the wellhead joint is provided with a vent valve, and the vent valve is located in the thick segment and close to the thick-thin joint.

12. An oil well testing flowline preventer according to claim 9, wherein: The vent valve is composed of a vent valve core, a valve core baffle and an O-ring, when the vent valve core is used to discharge well fluid, the valve plays a role of air inlet and discharges all the well fluid.

13. An oil well testing flowline preventer according to claim 9, wherein: A sealing ring is arranged in the adjusting space and fixed between the operating segment and the sliding valve sleeve.

14. An oil well testing flowline preventer according to claim 9, wherein: The righting stop block is fixedly connected with the outer wall of the sliding valve sleeve, and the distance of the sliding valve sleeve moving up and down is limited by abutting the righting stop block against the bottom surface of the limiting segment and the thick-thin joint of the internal part of the wellhead joint.

15. An oil well testing flowline preventer according to claim 9, wherein: The transmission mechanism is an electric motor, which is arranged in the shell, and a transmission shaft is arranged on the electric motor.

16. An oil well testing flowline preventer according to claim 9, wherein: The speed reducer is fixed in the shell, and the speed reducer is connected with the electric motor through a shaft coupling.

17. An oil well testing flowline preventer according to claim 9, wherein: A sealing ring is arranged between the outer wall of the sliding valve sleeve and the inner wall of the test tube.

18. An oil well testing flowline preventer according to claim 9, wherein: The positioning cap is fixed on the eccentric shaft through a positioning fixing screw.

19. An oil well testing flowline preventer according to claim 9, wherein: An O-shaped sealing ring is arranged between the eccentric shaft and the rear shaft sleeve.

20. An oil well testing flowline preventer according to claim 9, wherein: A plurality of sealing rings are arranged between the mandrel and the sealing plug.

21. An oil well testing flowline preventer according to claim 9, wherein: The anti-falling device comprises a pull piece, a hollow cylindrical tube, a spring and a pull piece handle.

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