阅读说明：本技术 一种用于环空电缆测井井口的刮油装置 (Oil scraping device for annular cable logging wellhead ) 是由 魏磊 唐林 赵杰 张宁 冯晓楠 郭常伟 李云 刘建魁 吕赴 凌强 陈少锋 李捷 于 2019-11-15 设计创作，主要内容包括：本发明提供了一种用于环空电缆测井井口的刮油装置,包括：用于连接井口的井口短节,在所述井口短接的内壁面上设有台肩；安装在所述井口短节的内部且端部抵靠在所述台肩上的刮油模块；用于调节所述刮油模块的控制模块；以及用于对电缆进行扶正的扶正模块,所述扶正模块安装在所述刮油模块和所述控制模块之间；其中,所述刮油模块与所述扶正模块之间采用锥面配合,所述控制模块能够轴向调节以使所述扶正模块在锥面配合的作用下压紧或放松所述刮油模块,来调节所述刮油模块对所述电缆的抱紧程度,从而使刮油模块能够在撤出所述电缆时刮去沾附在所述电缆上的原油。(The invention provides an oil scraping device for an annular cable logging wellhead, which comprises: the wellhead pup joint is used for connecting a wellhead, and a shoulder is arranged on the inner wall surface of the wellhead pup joint; the oil scraping module is installed inside the wellhead short section, and the end part of the oil scraping module abuts against the shoulder; a control module for adjusting the oil scraping module; the righting module is used for righting the cable and is installed between the oil scraping module and the control module; the oil scraping module and the centralizing module are in conical surface fit, the control module can be axially adjusted to enable the centralizing module to tightly press or loosen the oil scraping module under the action of conical surface fit to adjust the holding degree of the oil scraping module on the cable, and therefore the oil scraping module can scrape crude oil attached to the cable when the cable is withdrawn.)

1. A wiper apparatus for an annulus wireline logging wellhead comprising:

the wellhead short joint is used for connecting a wellhead short joint (110), and a shoulder (111) is arranged on the inner wall surface of the wellhead short joint;

a wiper module (120) mounted inside the wellhead sub with an end abutting against the shoulder;

a control module (140) for adjusting the oil scraping module; and

a righting module (130) for righting the cable, the righting module being mounted between the oil scraping module and the control module;

the oil scraping module and the centralizing module are in conical surface fit, the control module can be axially adjusted to enable the centralizing module to tightly press or loosen the oil scraping module under the action of conical surface fit so as to adjust the holding degree of the oil scraping module on the cable, and therefore the oil scraping module can scrape crude oil attached to the cable when the cable is withdrawn.

2. The oil scraping device of claim 1, wherein the outer wall surface of the lower end of the oil scraping module is configured as a first conical surface (122), the inner wall surface of the upper end of the centering module is configured as a second conical surface (135),

the control module axially compresses the centering module to enable the second conical surface to form axial and radial compression on the first conical surface, so that the oil scraping module holds the cable tightly.

3. The oil scraping apparatus as claimed in claim 2, wherein the taper angles of the first taper surface and the second taper surface are each set to be in the range of 20-30 °.

4. The oil scraping device according to claim 1 or 2, characterized in that the side walls of the oil scraping module are provided with axially extending cutting seams (121) along which the oil scraping module can be broken off to fit the oil scraping module over the cable.

5. A scraping apparatus according to any of claims 1-4, characterized in that the scraping module is made of nitrile rubber material.

6. The oil scraping device according to claim 1, wherein the centralizing module comprises a first centralizing body (131) and a second centralizing body (132) in semi-circular ring shape, a first blind hole (133) and a first cylindrical protrusion (134) are respectively provided on the circumferential butt end surfaces of the first centralizing body and the second centralizing body,

the first cylindrical protrusion can be fittingly installed in the first blind hole, so that the first centralizing body and the second centralizing body are buckled into a whole.

7. The oil scraping device of claim 1, wherein the control module comprises a first control body (141) and a second control body (142) of semi-circular ring shape, a second blind hole (143) and a second cylindrical protrusion (144) being respectively provided on the circumferential butt end faces of the first control body and the second control body,

the second cylindrical protrusion can be fittingly installed in the second blind hole, so that the first control body and the second control body are buckled into a whole.

8. An oil scraping device according to claim 1 or 7, characterized in that an external thread (145) is provided on the outer surface of the control module, and an internal thread (112) is provided at the end of the wellhead sub connected to the control module,

the control module and the wellhead short section are in matched connection through the external thread and the internal thread, the control module is screwed to axially adjust the compression degree of the righting module on the oil scraping module, and therefore the holding degree of the oil scraping module on the cable is adjusted.

9. The oil scraping apparatus of claim 8, wherein an adjustment portion is provided at an end of the control module opposite to the centering module, an outer wall surface of the adjustment portion is configured into a regular hexahedron shape, and the control module is axially adjustable by screwing the adjustment portion with a tightening tool.

10. The oil scraping device of claim 1 or 7, wherein a hydraulic cylinder is arranged at an axially outer end of the control module, and the hydraulic cylinder is controlled by a hand pump to axially adjust the centering module, so as to adjust the degree of the cable clasped by the oil scraping module.

Technical Field

The invention relates to the technical field of logging engineering of an annular well, in particular to an oil scraping device for an annular cable logging wellhead.

Background

In the cable logging construction process of the annular well, a cable and a logging instrument enter an annular space of an oil pipe and a sleeve through an eccentric wellhead of an oil pumping unit so as to be lowered into a shaft to measure and obtain corresponding stratum parameters. These annular wells are production wells, therefore, in the well logging process, crude oil can be stained with and attached to the cable to be taken out of the ground along with the cable and the instrument, and then drip to well head and ground, thereby cause the polluted environment. From this, need clear up the well head, this needs very big manpower and materials just can the clean up, has improved the construction cost of cable logging greatly.

Furthermore, in many areas of the field, there is no pressure in the annulus of the well. In most oil wells, gas production is accompanied. Therefore, the oil and gas in the well can reach pressure equilibrium in the relative standing process for a long time. Part of the oil-water interface of the well is close to the well mouth, so that in the well logging process, when a well logging instrument directly goes into the shaft from the eccentric well mouth and the well logging instrument and a cable pass through the oil-gas intervals, the relative oil-gas balance can be broken, so that the oil-gas gushing can be caused, and the well blowout can be caused. Although the blowout time is not long and the energy is not large, the wellhead is also polluted greatly, and the construction cost of the cable logging is increased. In the prior art, a blowout prevention pipe with a certain length is generally installed at a wellhead for blowout prevention, although the blowout prevention function can be realized, the blowout prevention effect is poor, and when the blowout prevention pipe is stuck in a well, the difficulty of blockage removal of the blowout prevention pipe at the wellhead is very high.

Disclosure of Invention

Aiming at part or all of the technical problems in the prior art, the invention aims to provide an oil scraping device for an annular cable logging wellhead, which can effectively scrape crude oil attached to a cable when the cable is withdrawn, and avoid environment pollution caused by taking the crude oil out of the well. In addition, the oil scraping device has a blowout prevention function, and can achieve a good blowout prevention effect.

To this end, according to the invention, it is proposed an oil wiper device for an annulus wireline logging wellhead, comprising: the wellhead pup joint is used for connecting a wellhead, and a shoulder is arranged on the inner wall surface of the wellhead pup joint; the oil scraping module is installed inside the wellhead short section, and the end part of the oil scraping module abuts against the shoulder; a control module for adjusting the oil scraping module; the righting module is used for righting the cable and is installed between the oil scraping module and the control module; the oil scraping module and the centralizing module are in conical surface fit, the control module can be axially adjusted to enable the centralizing module to tightly press or loosen the oil scraping module under the action of conical surface fit to adjust the holding degree of the oil scraping module on the cable, and therefore the oil scraping module can scrape crude oil attached to the cable when the cable is withdrawn.

In one embodiment, the outer wall surface of the lower end of the oil scraping module is configured as a first conical surface, the inner wall surface of the upper end of the centering module is configured as a second conical surface, and the control module compresses the centering module axially so that the second conical surface forms an axial and radial compression on the first conical surface, thereby enabling the oil scraping module to hold the cable tightly.

In one embodiment, the taper angles of the first taper surface and the second taper surface are each set in the range of 20 to 30 °.

In one embodiment, the side wall of the oil scraping module is provided with a cutting seam extending along the axial direction, and the oil scraping module can be broken along the cutting seam to sleeve the oil scraping module on the cable.

In one embodiment, the oil scraping module is made of a nitrile rubber material.

In one embodiment, the centering module comprises a first centering body and a second centering body which are semi-circular, wherein a first blind hole and a first cylindrical protrusion are respectively and correspondingly arranged on the circumferential butt end surfaces of the first centering body and the second centering body,

the first cylindrical protrusion can be fittingly installed in the first blind hole, so that the first centralizing body and the second centralizing body are buckled into a whole.

In one embodiment, the control module comprises a first control body and a second control body which are semi-annular, a second blind hole and a second cylindrical bulge are respectively and correspondingly arranged on the circumferential butt joint end surfaces of the first control body and the second control body,

the second cylindrical protrusion can be fittingly installed in the second blind hole, so that the first control body and the second control body are buckled into a whole.

In one embodiment, the outer surface of the control module is provided with external threads, and one end of the wellhead short section connected with the control module is provided with internal threads,

the control module and the wellhead short section are in matched connection through the external thread and the internal thread, the control module is screwed to axially adjust the compression degree of the righting module on the oil scraping module, and therefore the holding degree of the oil scraping module on the cable is adjusted.

In one embodiment, an adjusting portion is provided at an end of the control module opposite to the centering module, an outer wall surface of the adjusting portion is configured into a regular hexahedron shape, and the control module can be axially adjusted by screwing the adjusting portion with a screwing tool.

In one embodiment, a hydraulic cylinder is arranged at the axial outer end of the control module, and the hydraulic cylinder is controlled by a hand pump to axially adjust the centering module, so that the holding degree of the oil scraping module on the cable is adjusted.

Drawings

The invention will now be described with reference to the accompanying drawings.

Fig. 1 shows the structure of a wiper device for an annulus wireline logging wellhead according to the invention.

Fig. 2 shows the structure of the oil scraping module in the oil scraping device shown in fig. 1.

Fig. 3 shows the structure of the cutting line of the oil scraping module shown in fig. 2.

Fig. 4 shows the arrangement of the righting module in the scraper arrangement of fig. 1 in a disassembled state.

Figure 5 shows the structure of the first righting body in the righting module shown in figure 4.

Fig. 6 shows a configuration in which a control module in the oil scraping apparatus of fig. 1 is disassembled.

Fig. 7 shows the structure of the first control body in the control module shown in fig. 6.

In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.

Detailed Description

The invention is described below with reference to the accompanying drawings.

It should be noted that directional terms or qualifiers "up", "down", etc. used in the present application are all with reference to fig. 1. They are not intended to limit the absolute positions of the parts involved, but may vary from case to case.

Fig. 1 shows the structure of a wiper 100 for an annulus wireline wellhead according to the present invention. Such as

As shown in fig. 1, the oil scraping device 100 includes a wellhead sub 110 for connecting to a wellhead, an oil scraping module 120 for scraping oil, a centralizing module 130 for centralizing a logging cable, and a control module 140 for regulating and controlling the oil scraping module 120, which are sequentially installed in the wellhead sub 110. In operation, the wiper 100 is installed in a well head and a logging cable is run through the center of the wiper 100 to wipe off any oil that may be attached to the cable as the cable is withdrawn.

As shown in fig. 1, wellhead sub 110 is configured in the shape of a hollow cylinder. The lower end of the wellhead sub 110 is provided with a positive taper connecting buckle, and the wellhead sub 110 is fixedly connected to the wellhead (eccentric wellhead) of the annular hollow well through the positive taper connecting buckle. A shoulder 111 is arranged on the inner wall of the wellhead sub 110, and the shoulder 111 is arranged at one end close to the right conical connecting buckle. One end of the oil scraping module 120 is mounted in abutment on the shoulder 111, thereby forming an axial stop.

Fig. 2 shows the structure of the oil scraping module 120. As shown in fig. 2, the oil scraping module 120 is configured in a cylindrical shape. The oil scraping module 120 is made of rubber material which is wear-resistant and has moderate hardness. In one embodiment, the oil scraping module 120 is made of nitrile rubber prepared by emulsion polymerization of butadiene and acrylonitrile, so that the oil scraping module 120 has good oil resistance, wear resistance and heat resistance. The oil scraping module 120 is used for being sleeved on a cable to scrape off crude oil attached to the surface of the cable, the crude oil on the surface of the cable can be effectively scraped into a well, the crude oil is effectively prevented from being taken out of a well head by the cable, and therefore the pollution of the well head is avoided.

In the present embodiment, the side wall of the oil scraping module 120 is provided with a cutting slit 121 extending in the axial direction. In use, the oil scraping module 120 can be spread along the cutting seam 121 to put the cable into the oil scraping module 120 through the cutting seam 121, so that the oil scraping module 120 is sleeved on the cable. The outer diameter of the oil scraping module 120 is equal to the inner diameter of the wellhead sub 110, or the oil scraping module 120 and the inlet sub 110 are in interference fit. The outer wall surface of the end of the oil scraping module 120 fitted with the centering module 130 is provided with a first tapered surface 122 so that the outer diameter of the oil scraping module 120 is reduced axially inward from the axial end surface of the lower end. The function of the first tapered surface 122 will be described later.

To facilitate mounting of the wiper module 120 to the wellhead sub 110, one end of the wiper module 120 for abutting mounting to the shoulder 111 is chamfered. The chamfer can play a certain guiding role during installation, and is favorable for being smoothly installed in the wellhead short section 110 together with the oil scraping module 120.

Figure 4 shows the structure of the centralizer module 130 in a disassembled state. As shown in fig. 4, the centering module 130 is configured to include a first centering body 131 and a second centering body 132 which are semi-circular, and the first centering body 131 and the second centering body 132 are integrally connected in a butt joint manner. Two first blind holes 133 (see fig. 5) symmetrical with respect to the central axis of the centering module 130 are provided on the end surface of the first centering body 131 abutting against the second centering body 132. Meanwhile, two first cylindrical protrusions 134 are correspondingly disposed on the end surface of the second centering body 132 abutting against the first centering body 131. The first cylindrical protrusion 134 can correspond to and fit into the first blind hole 133 to integrally connect the first righting body 131 with the second righting body 132 to form the cylindrical righting module 130. The outside diameter of the centralizing module 130 is set to be equal to the inside diameter of the wellhead sub 110, or the centralizing module 130 is in clearance fit with the wellhead sub 110.

In operation, the first centering body 131 and the second centering body 132 of the centering module 130 are installed in a manner such that the cable is inserted between them for butt-joint installation, so that the cable passes through the centering module 130, and the centering module 130 is installed in the wellhead sub 110 and is cooperatively installed at the upper end of the wiper module 120. The righting module 130 can effectively guide and right the cable in the working process, can effectively avoid the eccentric abrasion of rubber, and further plays an effective protection role for the oil scraping module 120. Therefore, the righting module 130 can not only ensure the oil scraping effect of the oil scraping device 100, but also effectively avoid the abrasion of the oil scraping module 120, and significantly prolong the service life of the oil scraping module 120.

According to the present invention, the inner wall surface of the end (lower end in fig. 5) of the centering block 130 fitted with the wiper block 120 is provided with a second tapered surface 135, so that the inner diameter of the centering block 130 is reduced axially inward from the axial end surface of the lower end. The second tapered surface 135 and the first tapered surface 122 of the oil scraping module 120 can be fittingly installed to form a matching. In the working process, the centering module 130 is compressed in the axial direction downwards to enable the second conical surface 135 to extrude the first conical surface 122, the upper end portion of the oil scraping module 120 can generate a radially inward compression force, and therefore the oil scraping module 120 can hold the cable tightly, and the scraping effect of the oil scraping module 120 on crude oil on the surface of the cable is guaranteed.

In this embodiment, the axial compression of the oil scraping module 120 by the axial adjustment centralizing module 130 can tightly hold the cable, and the degree of tightness between the oil scraping module 120 and the cable can be effectively ensured by adjusting the degree of tightness. Meanwhile, the axial compression oil scraping module 120 can ensure the sealing performance between the axial end face of the oil scraping module 120 and the shoulder 111 in the wellhead sub 110, and the sealing performance between the outer wall face of the oil scraping module 120 and the inner wall face of the wellhead sub 110. Therefore, the sealing performance of the wellhead can be effectively ensured through the cooperation between the centralizing module 130 and the oil scraping module 120, and importantly, the oil scraping device 100 can also realize the blowout prevention function and effectively ensure the blowout prevention effect.

According to the invention, the first tapered surface 122 of the scraper module 120 and the second tapered surface 135 of the centering module 130 can be fitted, and the angles of inclination of the tapered surfaces of the first tapered surface 122 and the centering module 130 are set to be in the range of 20-30 °. This configuration of the first tapered surface 122 and the centering block 130 can significantly enhance the adjustment performance of the oil scraping device 100 for the cable holding degree, and significantly enhance the oil scraping effect and the blowout prevention performance of the oil scraping device 100.

Fig. 6 shows the structure of the control module 140 in a disassembled state. As shown in fig. 6, the control module 140 is configured to include a first control body 141 and a second control body 142 having a semicircular ring shape, and the first control body 141 and the second control body 142 are integrally connected in a butt joint manner. Two second blind holes 143 (see fig. 7) symmetrical with respect to the central axis of the control module 140 are provided on the end surface where the first control body 141 and the second control body 142 are butted. Meanwhile, two second cylindrical protrusions 144 are correspondingly provided on the end surface of the second control body 142 that is butted against the first control body 141. The second cylindrical protrusion 144 can correspond to the second blind hole 143 and be fittingly installed to connect the first and second control bodies 141 and 142 as a single body, thereby forming the cylindrical control module 140.

In operation, the first and second control bodies 141 and 142 of the control module 140 are mounted in a docking manner with the cable interposed therebetween, so that the cable passes through the control module 140. The control module 140 is connected to the upper end of the wellhead sub 110, and the lower end surface contacts the upper end surface of the centralizing module 130 for compressing the centralizing module 130. The axial adjustment control module 140 can axially compress or relax the centering module 130, and then compress or relax the oil scraping module, so as to adjust the degree of the oil scraping module 120 holding the cable tightly, thereby ensuring the oil scraping effect. The inner wall of the upper end of the control module 140 is formed in a bell mouth shape, and this structure of the upper port of the control module 140 facilitates the lowering or withdrawal of the cable. In addition, under the righting effect of the righting module 130, the centering of the cable is effectively ensured. Moreover, when the control module 140 is pressed tightly, the oil scraping module 120 can be squeezed tightly, so that the cable is held tightly, and an effective oil scraping effect is achieved.

In one embodiment, the control module is provided with external threads 145 on its outer peripheral surface. Meanwhile, an inner thread 112 is arranged on the inner wall of the upper end of the wellhead sub 110. The control module 140 is connected with the wellhead sub 110 in a matching mode through the external thread 145 and the internal thread 112, so that the control module 140 is fixedly installed at the upper end of the wellhead sub 110, and the oil scraping module 120 and the centralizing module 130 are axially limited. An axially outwardly extending adjustment portion 146 is provided at an upper end portion of the control module 140, and an outer surface of the adjustment portion 146 is configured in a regular hexahedral shape. In the working process, the worker screws the adjusting part 146 through the screwing tool to axially adjust the control module 140, so that the oil scraping module 120 is adjusted, and the oil scraping device 100 is ensured to be capable of sufficiently scraping oil.

In an embodiment, which is not shown, the control device 140 can also effect the adjustment of the scraper module by means of hydraulic control. For example, a hydraulic cylinder may be installed at the upper end of the control device 140, the hydraulic cylinder is communicated with a hand pump, and the hand pump is controlled to pressurize or release the hydraulic cylinder, so as to axially adjust the control module 140, thereby achieving the purpose of adjusting the degree of cohesion of the oil scraping module 120 to the cable, and achieving the oil scraping effect and the blowout prevention effect.

It should be further noted that the oil scraping device 100 for the annulus wireline logging wellhead according to the present invention can set the corresponding dimension parameters of each component according to the actual working conditions. For example, wellhead sub 110 may be provided with different sizes depending on the different oil field pumping units eccentric wellheads. The wiper module 120, the centralizer module 130, and the control module 140 may be provided with different sized inner diameters depending on the outer diameter of the different wireline. Therefore, the oil scraping device 100 can adapt to different well heads, and the application range of the oil scraping device 100 is expanded.

The operation of the wiper 100 for an annulus wireline wellhead according to the present invention is briefly described as follows. Firstly, the wellhead sub 110 is fixedly installed on the eccentric wellhead of the oil pumping unit in the oil field through a positive taper connecting buckle. The wireline, with logging instruments attached, is then run through the center of wellhead sub 110 and lowered into the wellbore. After the cable is lowered into the wellbore, the oil scraping module 120 is broken along the cutting seam 121, and the cable is placed into the oil scraping module 120 through the cutting seam 121, so that the oil scraping module 120 is sleeved on the cable, and then the oil scraping module 120 is installed into the wellhead sub 110 until the lower end face of the oil scraping module 120 abuts against the shoulder 111 in the wellhead sub 110. And then, the first centering body 131 and the second centering body 132 of the centering module 130 are connected in a buckling manner to be sleeved on the cable, and are installed in the wellhead sub 110 and at the upper end of the oil scraping module 120, and meanwhile, the matching connection between the first conical surface 122 and the second conical surface 135 is ensured. And then, the first control body 141 and the second control body 142 of the control module 140 are connected in a buckling mode to be sleeved on the cable and are installed at the upper end of the wellhead sub 110. Thereby, the entire oil scraping device 100 is mounted.

In the working process, the axial position of the control module 140 can be adjusted to compress or relax the centering module 130, so that the centering module 130 adjusts the degree of compression between the second tapered surface 135 and the first tapered surface 122 of the oil scraping module 120, thereby adjusting the degree of cable clasping by the oil scraping module 120. Therefore, the oil scraping module 120 is tightly attached to the outer surface of the cable, and crude oil adhered to the surface of the cable can be effectively filtered in the process of lifting the cable, so that the oil scraping effect of the oil scraping device 100 is remarkably improved.

The oil scraping device 100 for the annular cable well logging wellhead has good oil scraping and blowout preventing functions. This frizing device 100 can effectively strain the cable surface through frizing module 120 and be stained with the crude oil that attaches to can adjust the degree of hugging closely to the cable, thereby showing and improving the frizing effect, effectively avoided crude oil to be taken out the well head along with the cable and cause the pollution to the well head. The righting module 130 installed in the wellhead sub 110 can effectively guide and right the cable, so that the eccentric abrasion of the cable to the oil scraping module 120 can be effectively avoided, the oil scraping module 120 is well protected, and the service life of the oil scraping module 120 is prolonged. Meanwhile, under the compression action of the control module 140, the oil scraping module 120 forms effective seal with the cable and the wellhead pup joint 110, so that the oil scraping device 100 has a good blowout prevention function on a wellhead, and the wellhead is effectively prevented from being polluted by the sprayed crude oil. In addition, the oil scraping device 100 is simple in structure, convenient to operate and high in oil scraping efficiency, and can effectively reduce production cost.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.