CN201786319U

CN201786319U - Packer for dry hole

Info

Publication number: CN201786319U
Application number: CN2010205473028U
Authority: CN
Inventors: 马鹏; 何秀备; 吴关叶
Original assignee: Zhejiang Huadong Engineering Safety Technology Co ltd; Hydrochina East China Engineering Corp
Current assignee: Zhejiang Huadong Engineering Safety Technology Co ltd; Hydrochina East China Engineering Corp
Priority date: 2010-09-27
Filing date: 2010-09-27
Publication date: 2011-04-06
Anticipated expiration: 2020-09-27

Abstract

The utility model relates to a packer for a dry hole. The technical problem to be solved in the utility mode is to provide a packer for a dry hole characterized by simple structure and convenient use, to smooth undergoing of guarantee test (experiment) process and reliability of test (experiment) result. The technical scheme to solve the problem is: the packer for a dry hole comprises a rubber cylinder with a cross section of an annular shape, the two ends of the rubber cylinder are respectively in a sealed connection with an iron head, the ends of the two iron heads are both provided with a test section water inlet hole, the packer is characterized in that: wherein the end of one iron head is provided with a pressurization hole and a pressure relief hole both communicated with the rubber cylinder. The packer for a dry hole in the utility model is mainly suitable for hydraulic fracturing method geostress test and high pressure water pressure test in deep drilling of dry hole section in rock mass project.

Description

A kind of dry hole packing device

Technical field

The utility model relates to a kind of dry hole packing device, is mainly used in test of rock mass engineering project gun drilling dry hole section hydraulic fracturing geostatic stress and high pressure water injection test.

Background technology

For test of hydraulic fracturing geostatic stress and high pressure water injection test, packer (sealing embolism) is a key equipment, the quality of packer stagnant water effect, the achievement that directly has influence on test and test.

Common packer permeability test generally carries out in the boring drilling process, adopt and play one section of one section test, top-down method, water-stopping method is single embolization, the embolism that adopts on the early stage common exploratory drilling rig is single tube top pressing type (mechanical type), develops into hydraulic type and vapour-pressure type embolism afterwards.

Along with the introduction of hydraulic fracturing geostatic stress measuring technology and equipment, high-strength rubber cartridge type packer has obtained general application with its unique advantage.When hydraulic fracturing geostatic stress test or high pressure water injection test, at first need to choose the rock mass test (test) section that meets test (test) condition, adopt single or two packers will test the one or both ends packing of (test) section then, see Fig. 1.Its use principle is: before test (test) beginning, by pressure duct water-filling (oil or gas) in the rubber tube of packer, and exert pressure and make its expanded radially, closely contact with hole wall, reach the effect of sealing, can carry out test of hydraulic fracturing geostatic stress or high pressure water injection test to test section subsequently; After test (test) finishes, discharge water (oil or the gas) pressure that applies outside the aperture, under the effect of groundwater pressure, the rubber tube of packer radially dwindles gradually in rubber tube self elastic shrinkage and hole, to breaking away from hole wall, can be shifted and carry out next section test (test) work.

Existing packer comprises iron head 2 ' and rubber tube 1 ', the iron cephalic par pressurization hole 4 ' offering test section inlet opening 3 ' and be communicated with wherein with rubber tube, as Fig. 2, shown in Figure 3, groundwater table is higher in the hole, though or groundwater table darker, can groundwater table be raised near the aperture by the aperture water filling, after packer release this moment, hydraulic pressure and outer hydraulic pressure are in a basic balance in the packer rubber tube, so can be contracted to original state, do not influence test; But, groundwater table is very dark in running into boring, and in the time of can't making also by the aperture water filling that groundwater table is raised to the aperture in the hole, if adopt water or oily medium to come to make its expansion to the packer pressurization, then owing to there is not the effect of external water pressure power, the back packer rubber tube internal water pressure that expands just maintains certain hydrostatic pressure, cause it not shrink, packer just is stuck in the hole firmly, makes packer not to be shifted, and test (test) work can't be carried out again; If adopt gases at high pressure to make packer inflation, packer can shrink faster after the release, but because the compressibilty of gas is bigger, easily produce bigger compression at test (test) section high hydraulic pressure effect lower packet packing element, make of the direction finding infiltration of the press water of test, cause test (test) failure from packer.

For this reason, the someone has invented No. three push-and-pull switches of a special use, the problem of packer release difficulty when wanting to solve dry hole.But, this push-and-pull switch structure and imperfection, shortcoming is: after the packer water filling pressurization, pressure in the packer can't be observed, also can't give the packer ftercompction in test (test) process, when big or testing time is longer when test pressure, easily causes the packer internal pressure not enough or reduce, thereby make packing lose efficacy.

Summary of the invention

The technical problems to be solved in the utility model is: in the prior art in deep hole during the very low or dry hole of groundwater table, the problem of packer release difficulty, a kind of dry hole packing device simple in structure, easy to use is provided, tests carrying out smoothly of (test) process and test the reliable of (test) result with assurance.

The technical scheme that the utility model adopted is: the dry hole packing device, has the ringwise rubber tube of cross section, its two ends iron head that is tightly connected respectively, two iron cephalic pars all have the test section inlet opening, it is characterized in that: one of them iron cephalic par is offered pressurization hole and the pressure relief vent that all is communicated with rubber tube.

Described test section inlet opening is arranged in iron end surface center.

Described pressurization hole and pressure relief vent are the center symmetric arrangement with test section inlet opening axis.

Passed through the water pipe sealing between the test section inlet opening on two iron heads and be communicated with, rubber tube is coaxial to be coated at this and to cross the water pipe outside.

The beneficial effects of the utility model are: one of them iron cephalic par of the utility model is offered pressurization hole and the pressure relief vent that all is communicated with rubber tube, test (test) is preceding to be pressed in the rubber tube by pressurization hole Jiang Shui (oil), pressurization makes its expansion to packer, fit tightly with hole wall, after finishing, test (test) inflates in rubber tube by pressure relief vent with high-pressure pump, water in pipeline and the packer (oil) is extruded, when having solved in the prior art in deep hole the very low or dry hole of groundwater table, the problem of packer release difficulty, thus carrying out smoothly and testing the reliable of (test) result of test (test) process guaranteed.

Description of drawings

Fig. 1 is a packer structure chart in actual use in the utility model background technology.

Fig. 2 is the main sectional view of packer in the utility model background technology.

Fig. 3 is the left view of Fig. 2.

Fig. 4 is a main sectional view of the present utility model.

Fig. 5 is the left view of Fig. 4.

Fig. 6 is the utility model structure chart (two ends packing) in actual use.

Fig. 7 is the utility model structure chart (an end packing) in actual use.

The specific embodiment

Packer of the prior art is under deep hole dry hole situation, if adopt water (oil) medium to pressurize to packer, under the effect of atmospheric pressure and gravity, the water (oil) that connects packer pipeline and packer inside just is difficult to discharge, packer just can not shrink, and be stuck in the hole, make packer not to be shifted, test (test) work can't be carried out again; If adopt gas to pressurize to packer, though that packer shrinks is convenient, because of the easy compressibilty of gas can make the packing effect reduce, influence test (test) result.Therefore, consider to utilize the characteristics separately of water (oil) and gas, original packer is improved.Packing device structure after the improvement such as Fig. 4, shown in Figure 5 comprise the ringwise rubber tube 1 of cross section, and promptly this rubber tube is the cover tubular, forms seal cavity between its inner and outer wall; The rubber tube 1 two ends iron head 2 that is tightly connected respectively, center, two iron head 2 ends all has test section inlet opening 3, passed through water pipe 6 sealings between two test section inlet openings 3 and be communicated with, this is crossed water pipe and passes from the central through hole that rubber tube 1 inwall surrounds, and promptly crosses water pipe 6 and rubber tube 1 coaxial nested arrangement; Pressurization hole 4 and the pressure relief vent 5 that all is communicated with rubber tube 1 offered in one of them iron head 2 end, this pressurization hole 4 and pressure relief vent 5 are the center symmetric arrangement with test section inlet opening 3 axis, in actual the use, pressurize and release by

pressurization hole

4 and 5 pairs of rubber tubes 1 of pressure relief vent respectively.

As shown in Figure 6, in actual use, adopt the packing device of two present embodiments will test the two ends packing of (test) section, for packing device near the aperture, an end that has pressurization hole 4 and pressure relief vent 5 is arranged towards the aperture, test section inlet opening 3 on this end face (upper end) is tightly connected with penstock 7, be used for to test (test) section water-filling, pressurization hole 4 and pressure relief vent 5 are tightly connected with forcing pipe 8 and relief tube 9 respectively, test section inlet opening 3 on the other end (lower end) is tightly connected with floral tube 10, has weep hole on this floral tube; For packing device away from the aperture, its structure is different, only on iron head 2, offer test section inlet opening 3 near aperture one end, be connected with floral tube 10 end seals, realize the mutual location of two packing devices, be communicated with by leather hose 11 between two packing devices simultaneously, realize that two packing devices pressurize and release simultaneously; Certainly, for this packing device away from the aperture, also can adopt the identical structure of packing device with close aperture, during installation, an end that has pressurization hole 4 and pressure relief vent 5 is arranged towards the aperture, simultaneously pressure relief vent 5 and test section inlet opening 3 sealing that is positioned on the lower end iron head 2 are blocked, be positioned at test section inlet opening 3 on the upper end iron head 2 and be tightly connected with floral tube 10 and get final product, pressurization hole 4 seals to be communicated with the packing device in close aperture by leather hose 11 and gets final product.

Its operating principle is as follows: the packing device that connection is finished is after predetermined hole depth, in forcing pipe 8, uninterruptedly add water (oil) with high-pressure hydraulic pump (or oil pump), when the mouth of pipe water outlet (oil) of relief tube 9, close relief tube 9, continuation is to forcing pipe 8 pressurizations, make rubber tube 1 internal pressure reach predetermined packing pressure, close water inlet (oil) valve of forcing pipe 8 then, can begin geostatic stress test or high pressure water injection test.During test (test), pour water to test (test) section by penstock 7, mistake water pipe 6 and floral tube 10 successively.After test (test) finishes, open the valve of forcing pipe 8 and relief tube 9, calm the anger to relief tube 9 with high-pressure pump, make the water in relief tube 9, forcing pipe 8 and the rubber tube 1 flow out by forcing pipe 8, till whole outflows, this moment, packer did not have internal water pressure, then can comparatively fast shrink under rubber tube 1 elastic reaction, get back to the initial diameter size state and break away from, and then can be shifted and proceed test (test) in hole wall.

In the time of at the bottom of test (test) section is positioned at the hole, adopt a packing device will test the upper end packing of (test) section, as shown in Figure 7, an end that has pressurization hole 4 and pressure relief vent 5 is arranged towards the aperture, test section inlet opening 3 on this end face (upper end) is tightly connected with penstock 7, be used for to test (test) section water-filling, pressurization hole 4 and pressure relief vent 5 are tightly connected with forcing pipe 8 and relief tube 9 respectively, test section inlet opening 3 on the other end (lower end) is tightly connected with floral tube 10, has weep hole on this floral tube.Its operating principle is the same.

Claims

1. dry hole packing device, has the ringwise rubber tube of cross section (1), its two ends iron head (2) that is tightly connected respectively, two iron heads (2) end all has test section inlet opening (3), it is characterized in that: pressurization hole (4) and the pressure relief vent (5) that all is communicated with rubber tube (1) offered in one of them iron head (2) end.

2. dry hole packing device according to claim 1 is characterized in that: described test section inlet opening (3) is arranged in iron head (2) end face center.

3. dry hole packing device according to claim 2 is characterized in that: described pressurization hole (4) and pressure relief vent (5) are the center symmetric arrangement with test section inlet opening (3) axis.

4. according to claim 1 or 2 or 3 described dry hole packing devices, it is characterized in that: passed through water pipe (6) sealing between the test section inlet opening (3) on two iron heads (2) and be communicated with, rubber tube (1) is coaxial to be coated at this and to cross the water pipe outside.