CN104142258A - Core segmented sealing device and application method - Google Patents
Core segmented sealing device and application method Download PDFInfo
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- CN104142258A CN104142258A CN201310168182.9A CN201310168182A CN104142258A CN 104142258 A CN104142258 A CN 104142258A CN 201310168182 A CN201310168182 A CN 201310168182A CN 104142258 A CN104142258 A CN 104142258A
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Abstract
The invention provides a core segmented sealing device and its application method and belongs to the field of petroleum geology. The device comprises a core storage cylinder and inflation sealing rings. The core storage cylinder has a cylindrical structure, one end of which is a sealed end and the other end of which is an open end. The open end is provided with a top cover. At least two pilot holes are arranged on the wall of the core storage cylinder. Each pilot hole contains two through-holes which are apart from each other 180 degrees on a circle. Axes of all through-holes are vertical to the axis of the core storage cylinder 1. The inner wall of the core storage cylinder is provided with at least two annular seal grooves. Each annular seal groove is corresponding to a pilot hole. Each pilot hole enables its corresponding annular seal groove to be communicated with the outside world. One of the inflation sealing rings is installed in each annular seal groove. By the use of the device, rapid and segmented sealed storage of cores is realized, gas dissipation under the atmospheric condition is minimized, and a foundation is laid for the next steps of analytical tests and research work.
Description
Technical field
The invention belongs to oil-gas geology field, be specifically related to a kind of rock core sectional type packoff and using method thereof.
Background technology
Rock core is as a kind of formation sample of preciousness, even if risen to by shaft bottom in the process of well head, can there is diffuse fluid and the phenomenon such as overflow, but still can be by various technological means, obtain resident fluid, formation lithology, mineral composition, preserve the important informations such as permeance property and mutual relationship thereof, in oil gas evaluation working, there is irreplaceable effect.Current, in order to obtain resident fluid information from rock core, and alleviate rock core and rise to further scattering and disappearing of fluid after well head, adopted multiple technologies ways and means.
According to " conventional method of analysis of SY/T5336-1996 rock core " and " conventional method of analysis of SY/T5336-2006 rock core ", introduce, the sealing of rock core such as preserves and mainly takes seal of vessel method, freezing, seals with wax at the method, specific as follows:
(1) seal of vessel method: rock core can directly pack container into, also can be with being sealed in container after aluminium foil, tygon or other suitable plastics packages.The rock core packing in container has two kinds of modes to preserve, and the one, in container, do not pour any liquid into; The 2nd, liquid used while pouring quantitative mensuration rock sample in container into, the rock sample bubble being about to after weighing seals in measuring liquid.The method is applicable to preserve the rock sample of analysis profit saturation degree and the rock sample of specific (special) requirements.
(2) freezing: freezing with-25 ℃ of low temperature refrigerators.In the time of need to transporting, at rock core, cover dry ice around.Be applicable to preserve loose core.
(3) immersion liquid coating (method of sealing with wax): with a container by melted paraffin wax, temperature 70-90 ℃, core surface is processed clean, and indicate and push up the end degree of depth, with tinfoil, wrap, catch up with the air between paper and rock core, and pack tightly with the adhesive tape not absorbing water, finally at rock core section middle part, with iron wire, tie up, iron wire ending is tied to form ring-type.When wax reaches requirement, rock core is immersed in wax, wax is taken out after being stained with whole rock core very soon, repeats 3-4 time, and rock core is all sealed with wax, and wax layer thickness reaches 1-2mm.The method is applicable to preserve and cements, in order to analyze the rock core of profit saturation degree.
(4) plastic bag packaging method: polybag is only preserved for the rock core of short-term.Space between rock core and polybag should be a little bit smaller, if polybag is too large, can fold up use.On polybag, should clearly carry out label and carry out the fixing processing of suitable machinery.
(5) heat seal plastic film packaging method: have to be severally subject to thermosealed plastic sheeting can be used for sealing rock core.Aluminium foil or tygon can be used to increase thin film strength.Plastic sheeting can stop the gentle body of steam, opposing chemical reaction and fluid degradation.In this method, heat seal is crucial, and in order effectively to seal, it is consistent that heat seal mateiral temperature Yao Yu producer stipulates.On material, can select the film of tubulose, a sealing both ends.Two end spaceses of rock core parcel should be as far as possible little.
Above-mentioned existing method, as a part for standard, has been brought into play due effect in work in the past.
In addition, Wang Zhongxing (2010) etc. has proposed a kind of long-term preservation method for well core (patent applied for).Thereby mainly having solved the rock core that fracture is disintegrated from the taking-up of shaft bottom is difficult to be difficult to form the problem that an integral planar causes being difficult to preservation after cutting or cutting.It is characterized in that: first prepare mould material; Then the rock core that will preserve swings in the U-shaped bracket of tygon; Mould material is slowly poured in the U-shaped bracket of tygon that is contained with rock core; Gel sizing under room temperature, in thermostatic drying chamber, after solidifying and setting, cut rock core, then put into the U-shaped bracket of transparent organic glass, carry out second pouring, after cast to polyester resin surface in the U-shaped bracket of transparent organic glass polish, polishing, polishing, till reaching clear transparent.Application the method can be carried out the integral cutting of rock core, and cutting planes is smooth, and the original rock core of persistence is not broken, is convenient to comprehensive observation.
Shale gas, compact sandstone gas are current important Exploration Domain, in shale gas exploratory development process, mode is deposited in the tax of gas and content is one of research emphasis, particularly obtains the rock core information such as air content and change of component thereof vertically, significant for the evaluation study of shale gas.From this demand, existing method has deficiency and the limitation of the following aspects.The one, the Collection and analysis that is not easy to gas is tested; The 2nd, seal process is longer, easily causes gas loss.Three is, after one section of (certain length) rock core sealing is preserved, to be difficult under sealing state, obtain the information that this section of core axis changes to gassiness again.For this reason, a kind of new rock core sealing save set of research and design and method thereof are very important.
Summary of the invention
The object of the invention is to solve the difficult problem existing in above-mentioned prior art, a kind of rock core sectional type packoff and using method thereof are provided, for the research work such as shale gas evaluation provide new tool, new method, realizing sectional type, the fast sealing of well site monoblock rock core preserves, by gas analyzing apparatus, can carry out Determination of octafluoropropane content to rock core segmentation vertically, for axially (layer vertical) Changing Pattern, the research of gas occurrence status of rock core gassiness, and gas-bearing property and lithology, mineral composition, the association analysis research etc. of preserving permeance property create conditions.
The present invention is achieved by the following technical solutions:
A rock core sectional type packoff, comprises storage heart cylinder and gas-flow closure circle;
Described storage heart cylinder is tubular structure, and one end is sealed end, and the other end is openend; At described openend, be provided with top cover;
On the wall of described storage heart cylinder, have at least 2 group pilot holes, every group of pilot hole is included in two through holes of 180 ° of being separated by circumference, and the axis of all through holes is all vertical with the axis of storage heart cylinder 1;
At least 2 ring seal ring recess are installed on the inwall of described storage heart cylinder; The corresponding one group of pilot hole of each ring seal ring recess, every group of pilot hole is in communication with the outside its corresponding ring seal ring recess;
A described gas-flow closure circle is installed in ring seal ring recess described in each.
On the wall of the storage heart cylinder between every two adjacent groups pilot hole, be equipped with an air inlet/outlet, air inlet/outlet makes the inner chamber of storing heart cylinder be communicated with outside;
On the wall of the storage heart cylinder between first group of pilot hole and openend and between last group pilot hole and sealed end, also all have an air inlet/outlet; Described air inlet/outlet is for gas injection in storage heart cylinder or gather the gas in storage heart cylinder, also can be connected with other gas analysis arrangements etc.
The profile of described gas-flow closure circle is circular, and inside is hollow-core construction, in its outside, is provided with valve and fixed bar, and the two arranges with the position of 180 ° of being separated by;
Described valve is communicated with the inner space of gas-flow closure circle, for inflation;
Described fixed bar is fixing for gas-flow closure circle;
Described valve and fixed bar are respectively through two through holes corresponding to ring seal ring recess; Gas-flow closure circle is fixed in ring seal ring recess by fixed bar and valve, can change;
Inner side at described gas-flow closure circle is provided with Baltimore groove, is provided with the scalable part of depression, in this Baltimore groove under state of nature, the scalable part of described depression is contracted in Baltimore groove, when by valve when inflating in gas-flow closure circle, the scalable part that caves in is subject to compression swelling, stretches out Baltimore groove.
The outer rim of described ring seal ring recess is fixedly connected with the inwall of storage heart cylinder, and the internal diameter of annular seal groove is slightly larger than core diameter, to facilitate rock core to put into and take out.
At the outer wall of storing the openend of heart cylinder, be provided with step, the second support ring is housed on this step, outer wall at sealed end is provided with step, the first support ring is housed on this step, a side at the close top cover of described the second support ring is provided with groove, in this groove, be placed with O RunddichtringO, described top cover and storage heart cylinder seal by described O RunddichtringO.
Described top cover is fixed on openend by securing member; In the bottom of storing the external cylindrical surface of heart cylinder, be provided with base 15, to facilitate the fixing of storage heart cylinder and to place.
Described rock core sectional type packoff further comprises packed column, and described packed column is arranged between top cover and rock core;
Described packed column comprises two filling pieces that be arranged in parallel, and two filling pieces connect by spring;
Described filling piece is discoid, and its diameter equates with standard core diameter, when the length of rock core is less than the inner length of storage heart cylinder 1, puts it into storage heart cylinder after putting into rock core, for prevent rock core in storage heart cylinder vertically movable, break.
A using method for described rock core sectional type packoff, comprises the following steps:
(1) rock core is taken to ground and goes out after cylinder, remove the drilling fluid of core surface, be placed in storage heart cylinder, and screw top cover;
(2) connect source of the gas, by valve to injecting gas in gas-flow closure circle, the scalable demi-inflation be adjacent to the surface of rock core of making to cave in, rock core and the annular space store between heart cylinder are just split into the segment that N isolates mutually like this.
In described step (1), when the length of rock core is less than the inner length of storage heart cylinder, also packed column to be put into storage heart cylinder after putting into rock core, be located between rock core and top cover; The N of described step (2) is number+1 of gas-flow closure circle.
Described method further comprises:
Under the condition of normal temperature laboratory normal pressure, or under the indoor condition heating during storage heart cylinder is placed into water bath, the air inlet/outlet of storage heart cylinder is connected with gas analysis arrangement, for analyzing gas desorption amount and the component thereof of the rock core that is positioned at each segment.
Compared with prior art, the invention has the beneficial effects as follows:
(1) rock core goes out after cylinder, rock core fast, segmented seal preserves, and can reduce gas loss under atmospheric conditions, for lower step analytical test and research work lay the foundation;
(2) realization of sectional type fast sealing, lays a good foundation to air content variation and air content and lithology, mineral composition, the correlation analysis of preserving permeance property for deeply portraying core axis;
(3) realization of sectional type fast sealing, for the research of each section of rock core gas desorption rule is laid a good foundation.
Accompanying drawing explanation
Fig. 1 is the diagrammatic cross-section of rock core sectional type packoff of the present invention.
Fig. 2 is the structural representation of the gas-flow closure circle in rock core sectional type packoff of the present invention.
Fig. 3 is the structural representation of the packed column in rock core sectional type packoff of the present invention.
Wherein, 1 is storage heart cylinder, and 2 is ring seal ring recess, 3 is gas-flow closure circle, and 4 is valve, and 5 is air inlet/outlet, 6 is fixed bar, and 7 is O RunddichtringO, and 8 is top cover, 9 is securing member, and 10 is rock core, and 11 is packed column, 12 is the first support ring, and 13 is the second support ring, and 14 is the scalable part of depression, 15 is base, and 301 is filling piece, and 302 is spring.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
As shown in Figure 1, a kind of rock core sealing save set, at least comprises with lower member, storage heart cylinder 1, gas-flow closure circle 3, packed column 11 etc.
Storage heart cylinder 1 has penetrating tubular structure, and cylinder outer rim bottom is provided with base 15, to facilitate storage heart cylinder to fix, place; One end of cylinder is directly airtight (envelope), and the other end is provided with opening and top cover 8, and opening extends to outer rim, coordinates with top cover 8 and securing member 9, realizes the sealing of opening part; Storage heart cylinder 1 outer rim is separated by 180 ° and is provided with two holes, and one is passed through for O-ring seal 3 valves, and one is passed through for O-ring seal fixed bar 6.At the bottom of the top of storage heart cylinder 1, be respectively arranged with the first support ring 12 and the second support ring 13, play a supportive role.The first support ring 12 is arranged at one end of cylinder sealing, and the second support ring 13 is arranged at the openend of cylinder, and is provided with groove, and for placing O RunddichtringO 7, top cover 8 and cylindrical shell are by O RunddichtringO 7 gluing, sealings, so that putting into of rock core 10 taken out and sealing.
The inboard cylinder of storage heart cylinder 1 is provided with ring seal ring recess 2 with certain spacing (depending on the needs), be used for placing gas-flow closure circle 3, on each ring seal ring recess 2, correct position is provided with two apertures of 180 ° of being separated by, one for placing gas-flow closure circle valve 4, and another places gas-flow closure circle fixed bar 6.The outer rim of ring seal ring recess 2 is connected and fixed with the modes such as welding and storage heart cylinder inwall, and the internal diameter of annular seal groove 2 is slightly larger than core diameter, to facilitate rock core to put into and take out; Storage heart cylinder 1 is provided with air inlet/outlet 5, for the gas in gas injection or collection tube in cylinder, also can be connected with other gas analysis arrangements etc.
As shown in Figure 2, gas-flow closure circle comprises gas-flow closure circle 3, O-ring seal valve 4, O-ring seal fixed bar 6 and the scalable part 14 of depression.
The profile of gas-flow closure circle 3 is circular, and inside is hollow-core construction, is provided with valve 4 and fixed bar 6, and the two arranges to be separated by 180 ° in O-ring seal outer rim, and valve 4 is for inflation, and fixed bar 6 is fixing for O-ring seal.Gas-flow closure circle 3 is that silicon rubber makes, and smooth in appearance, has elasticity, nonpoisonous and tasteless, Applicable temperature scope (100 ℃-280 ℃).Under state of nature (under an atmospheric condition), the scalable part 14 of depression of gas-flow closure circle 3 is contracted in Baltimore groove, when by valve 4 when inflating in O-ring seal air bag, O-ring seal air bag is because being deformed by internal pressure effect, middle recess outwards bulges, stretch out the surperficial close contact of groove and rock core 10, form several (gas-flow closure circle number+1) the relatively independent annular spaces that can preserve rock core desorption gas, thereby realize segmented seal and the isolation of rock core; When needs depressurization, isolation, then discharge air by valve 4, O-ring seal dilation automatic retracted, to groove interior (state of nature), departs from core surface.
As shown in Figure 3, packed column 11 is comprised of two filling pieces 301 and spring 302, and filling piece 301 is discoid, and diameter is suitable with standard core diameter, by steel plate etc., has the material of some strength, atresia to make.When rock core 10 length are less than storage heart cylinder 1 inner length, put it into storage heart cylinder after putting into rock core 10, for prevent rock core in storage heart cylinder vertically movable, break.
The course of work that rock core of the present invention sealing is preserved is: rock core to ground goes out after cylinder, removes surperficial drilling fluid, is placed into rapidly in storage heart cylinder, when rock core length is less than storage heart cylinder inner length, packed column is put into storage heart cylinder after putting into rock core, and screws top cover; Connect source of the gas, to injecting gas in gas-flow closure circle, the gas with certain pressure makes the scalable demi-inflation of O-ring seal and is adjacent to core surface, now, the sealing function of O-ring seal is divided into rock core and the annular space between the storage heart cylinder segment of several relative isolation, after gas discharges and desorbs from rock core, concentrate on respectively in the annulus of several relative isolation, thereby the sectional type sealing that has realized rock core is preserved.
Application process after rock core sealing:
(1) rock core, after apparatus of the present invention sealing, can be transported to laboratory, carries out various analytical tests;
(2) under indoor, normal temperature and pressure, the air inlet/outlet 5 of storage heart cylinder 1 is connected with gas analysis arrangement, can analyze each section of rock core gas desorption amount and component thereof, for shale gas Content evaluation etc. provides basic data.
(3) indoor, storage heart cylinder 1 is placed in water bath and is heated, analyze each section of rock core under condition of different temperatures, gas desorption amount and component thereof, for shale gas Content evaluation etc. provides basic data.
(4) utilize each segmentation data and other lithology, the mineral composition such as gas flow, component, preserve the contrast association analysis of the data such as permeance property, for shale gas comprehensive evaluation provides basic data.
The present invention can be applied to oil-gas geology field.At situ of drilling well rock core, go out after cylinder, can apply the rock core packoff of the present invention's design the sealing of rock core sectional type is preserved.Owing to having realized sectional type sealing, thus can core axis be analyzed to air content, component and variation thereof by gas analysis arrangement, and can be with lithology, mineral composition, preserve permeance property etc. and contrast association analysis research.In addition, can also, by devices such as heating water baths, carry out the gas desorption rule research of rock core under uniform temperature condition etc.Therefore there is application value and good application prospect.
The present invention can be used for the fast sealing of well site rock core, and not only for oil-gas geology field provides a kind of new equipment, and sectional type is sealed into core axis and provides new approach and thinking to the variations such as gas content and association analysis thereof.
Technique scheme is one embodiment of the present invention, for those skilled in the art, the invention discloses on the basis of application process and principle, be easy to make various types of improvement or distortion, and be not limited only to the described method of the above-mentioned embodiment of the present invention, therefore previously described mode is just preferred, and does not have restrictive meaning.
Claims (10)
1. a rock core sectional type packoff, is characterized in that: described rock core sectional type packoff comprises storage heart cylinder and gas-flow closure circle;
Described storage heart cylinder is tubular structure, and one end is sealed end, and the other end is openend; At described openend, be provided with top cover;
On the wall of described storage heart cylinder, have at least 2 group pilot holes, every group of pilot hole is included in two through holes of 180 ° of being separated by circumference, and the axis of all through holes is all vertical with the axis of storage heart cylinder 1;
At least 2 ring seal ring recess are installed on the inwall of described storage heart cylinder; The corresponding one group of pilot hole of each ring seal ring recess, every group of pilot hole is in communication with the outside its corresponding ring seal ring recess;
A described gas-flow closure circle is installed in ring seal ring recess described in each.
2. rock core sectional type packoff according to claim 1, is characterized in that: on the wall of the storage heart cylinder between every two adjacent groups pilot hole, be equipped with an air inlet/outlet, air inlet/outlet makes the inner chamber of storing heart cylinder be communicated with outside;
On the wall of the storage heart cylinder between first group of pilot hole and openend and between last group pilot hole and sealed end, also all have an air inlet/outlet.
3. rock core sectional type packoff according to claim 2, is characterized in that: the profile of described gas-flow closure circle is circular, and inside is hollow-core construction, in its outside, is provided with valve and fixed bar, and the two arranges with the position of 180 ° of being separated by;
Described valve is communicated with the inner space of gas-flow closure circle, for inflation;
Described fixed bar is fixing for gas-flow closure circle;
Described valve and fixed bar are respectively through two through holes corresponding to ring seal ring recess, and gas-flow closure circle is fixed in ring seal ring recess by fixed bar and valve;
Inner side at described gas-flow closure circle is provided with Baltimore groove, is provided with the scalable part of depression, in this Baltimore groove under state of nature, the scalable part of described depression is contracted in Baltimore groove, when by valve when inflating in gas-flow closure circle, the scalable part that caves in is subject to compression swelling, stretches out Baltimore groove.
4. rock core sectional type packoff according to claim 3, is characterized in that: the outer rim of described ring seal ring recess is fixedly connected with the inwall of storage heart cylinder, and the internal diameter of annular seal groove is slightly larger than core diameter.
5. rock core sectional type packoff according to claim 4, it is characterized in that: at the outer wall of storing the openend of heart cylinder, be provided with step, the second support ring is housed on this step, outer wall at sealed end is provided with step, the first support ring is housed on this step, a side at the close top cover of described the second support ring is provided with groove, is placed with O RunddichtringO in this groove, and described top cover and storage heart cylinder seal by described O RunddichtringO.
6. rock core sectional type packoff according to claim 5, is characterized in that: described top cover is fixed on openend by securing member; In the bottom of storing the external cylindrical surface of heart cylinder, be provided with base.
7. rock core sectional type packoff according to claim 6, is characterized in that: described rock core sectional type packoff further comprises packed column, and described packed column is arranged between top cover and rock core;
Described packed column comprises two filling pieces that be arranged in parallel, and two filling pieces connect by spring;
Described filling piece is discoid, the equal diameters of its diameter and standard rock core.
8. a using method for rock core sectional type packoff claimed in claim 7, is characterized in that: said method comprising the steps of:
(1) rock core is taken to ground and goes out after cylinder, remove the drilling fluid of core surface, be placed in storage heart cylinder, and screw top cover;
(2) connect source of the gas, by valve to injecting gas in gas-flow closure circle, the scalable demi-inflation be adjacent to the surface of rock core of making to cave in, rock core and the annular space store between heart cylinder are just split into the segment that N isolates mutually like this.
9. method according to claim 8, is characterized in that: in described step (1), when the length of rock core is less than the inner length of storage heart cylinder, also packed column will be put into storage heart cylinder after putting into rock core, be located between rock core and top cover;
The N of described step (2) is number+1 of gas-flow closure circle.
10. method according to claim 8 or claim 9, is characterized in that: described method further comprises:
Under the condition of normal temperature laboratory normal pressure, or under the indoor condition heating during storage heart cylinder is placed into water bath, the air inlet/outlet of storage heart cylinder is connected with gas analysis arrangement, for analyzing gas desorption amount and the component thereof of the rock core that is positioned at each segment.
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| CN201310168182.9A CN104142258B (en) | 2013-05-09 | 2013-05-09 | A kind of rock core stagewise sealing device and using method thereof |
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