CN100504026C - Perforation and cracking method - Google Patents
Perforation and cracking method Download PDFInfo
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- CN100504026C CN100504026C CNB2005101256834A CN200510125683A CN100504026C CN 100504026 C CN100504026 C CN 100504026C CN B2005101256834 A CNB2005101256834 A CN B2005101256834A CN 200510125683 A CN200510125683 A CN 200510125683A CN 100504026 C CN100504026 C CN 100504026C
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- perforation
- duct
- strong reductant
- gas
- pressure
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Abstract
The invention relates to oil and gas well perforation and pressing crack continuous operation method and device. The method includes the following steps: using jetting caused by bullet blasting to realize perforation; carrying strong reducer to channel and react with water to generate hydrogen or acetylene etc; pressing into air or oxygen to blast for many times to make rock produce crack and extend, thereby enlarge oil gas seepage area, increase per-well production.
Description
Technical field
The invention belongs to and a kind ofly once realizing the method that perforating oil gas well and pressure break are worked continuously in the construction.
Background technology
There is quite a few petroleum gas reserves to be present in the rock of low-permeability in the world.Often can not reach economic gas stream with conventional harvesting technique.Therefore, people improve the well yield of hypotonic oil gas field with a lot of ways.Wherein the most classical the most frequently used way is the waterpower acid fracturing.It is behind perforation, with large-scale special equipment acid fracturing liquid and fracturing sand is pressed into the stratum, and rock cracks under the highly pressurised liquid effect.The shortcoming of fracturing is: 1, large-scale special equipment cost is higher; 2, operation is loaded down with trivial details, and the duration is longer; 3, both made the segmentation operation, and can not guarantee even pressure break, after a part of duct pressed off, another part then was difficult to press off again; 4, owing to be subjected to the restriction of pipeline, joint, valve intensity, hydraulic pressure has a safety margins, and for high-intensity stratum, fracturing is difficulty; 5, for the oil gas well that is unsuitable for areas such as desert that oversize vehicle enters, high mountain, marsh, fracturing can not be constructed.
In order to remedy the shortcoming of fracturing, recent two decades has developed high enegry gas fracturing and synergy perforation.High enegry gas fracturing is to send into Pressure breaking bullet behind the perforation in pit shaft, and lighting Pressure breaking bullet then has gases at high pressure to be full of pit shaft, certainly there is certain souring in the duct.Afterwards, Pressure breaking bullet is contained on the rifle string, after perforation was finished, the gases at high pressure of Pressure breaking bullet rushed at the duct by the eyelet of perforating gun, realized washing away and pressure break the duct.Again afterwards, cancel Pressure breaking bullet, propellant had been fixed on around the perforating bullet, be called one bullet or synergy perforation, after the perforating bullet blast, the propellant that ignites, propellant is converted into gases at high pressure, realizes washing away and pressure break the duct.
In fact, high enegry gas fracturing and synergy perforation are not extensively promoted so far.This be because: 1, the gases at high pressure that produced at first act in gun barrel or the sleeve pipe, just enter the duct then.Be subjected to the restriction of gun barrel and casing strength, the surge pressure of gases at high pressure can not be too high, otherwise the injury sleeve pipe, even cause the accident, but hypotony is not enough to again there is unsurmountable contradiction in the effect of duct generation pressure break on this principle of specification.2, the burning of propellant is to carry out under the state near sealing, the speed of burning is stressed and Temperature Influence, and pressure and temperature is subjected to the influence of burning velocity again simultaneously, like this, surge pressure just is difficult to prediction and control, and this is the main cause that fried for many years well accident occurs.
Summary of the invention
In order to overcome the shortcoming of high enegry gas fracturing and synergy perforation, the present invention finds that a kind of that strong reductant is delivered to sleeve pipe is outer and produce the repeatedly method of blast in the stratum, and has designed the feasible device of a cover for this reason.
This method is: utilize the jet of perforating bullet that strong reductant is sent into the perforation tunnel: form jet after perforating bullet detonates, ignite flexible explosive simultaneously, the gas of flexible explosive blast is pushed strong reductant to axis; Said strong reductant comprises the material of alkali metal, alkaline-earth metal and other chance water generates hydrogen, also comprise the calcium carbide of meeting water generates acetylene, when strong reductant produces hydrogen or acetylene gas, in the duct, be pressed into air or oxygen, it is blasted in the duct.
The principle of its institute's foundation is: 1, the jet duration of perforating bullet is 100-150ms, and the time that the duct forms is 30-50us, this explanation is not that whole jets all have the thorough effect of soaking, and can utilize the part streams that does not soak thorough effect that needed strong reductant is sent into the duct.2, be strong reductant owing to what send into the duct, the process of sending into is safe, and this is that strong again reducing agent chemical reaction can not take place yet because the perforating bullet jet is a reducing atmosphere.3, strong reductant can contact with water in the duct chemical reaction takes place, and as meeting releasing hydrogen gas such as alkali metal, alkaline-earth metal, calcium carbide can be emitted acetylene:
Na+H
2O→1/2H
2+NaOH
CaC
2Ten 2H
2OC
2→ H
2+ Ca (OH)
2
4, be pressed into air or oxygen in the duct, hydrogen or acetylene will be blasted:
H
2+1/2O
2→H
2O
C
2H
2+5/2O
2→2CO
2+H
2O
Among the present invention, above-mentioned principle is achieved in that placement cabin, perforating bullet the place ahead body, and cabin body inwall posts flexible explosive, is full of remaining space through the strong reductant that encapsulates, and fluidic channel is reserved in the axis.Perforating bullet is ignited the back and is formed jet, ignites flexible explosive simultaneously, and the gas of flexible explosive blast is pushed strong reductant to axis.The process of perforation is very fast, and when strong reductant arrived axis, perforation was finished, and strong reductant is along with the jet that does not soak thorough effect rushes at the duct, and is long-pending to extrapolation from the depths, duct.In the realization, strong reductant is made graininess, the chemical reaction of strong reductant and water successively carries out, so hydrogen or acetylene discharge gradually.After being pressed into air in the duct, the concentration of hydrogen or acetylene reaches explosion limit and will blast, so blast must be repeatedly to take place, this blast that repeatedly takes place is favourable to the rock pressure break, it can make the crack that presses off constantly extend, consequently enlarge the seepage area of oil gas, improved the oil and gas production of individual well.
Characteristics of the present invention are obvious, the first, and be when once constructing, to finish perforation and two operations of pressure break continuously, required equipment is close with conventional perforation, and construction cost and equipment and materials cost are lower.The second, it is very favourable that repeatedly exploding of taking place outside sleeve pipe made seam to the pressure break of rock.The 3rd, the percussion of blast is in jacket exterior, and the blast of blast can arrive in the rifle by eyelet, obtains buffering in rifle, and the safety of sleeve pipe is secure.
Description of drawings
Fig. 1 is conventional perforating system and ignites preceding view;
Fig. 2 is conventional perforating effect schematic diagram;
Fig. 3 is the structural representation of apparatus of the present invention;
Fig. 4 is the invention process procedure chart;
Fig. 5 is the invention process figure as a result.
Among the figure, duct, 6 stratum, 7 perforating bullet shell cases, 8 perforating bullet powder charges, 9 perforating bullet cavity liners, 10 elastic rings, 11 locating rings, 12 cabin bodies, 13 flexible explosives, the 14 packed strong reductants, 15 that 1 transmission oil pipe, 2 sleeve pipes (omitting the cementing concrete layer), 3 perforating guns (omitting well liquid), 4 perforating bullets (omitting firing mount, detonating fuse), 5 jets penetrate in the stratum are sent into the crackle of reducing agent, 16 ducts and the extrusion in duct.
The specific embodiment
By structure shown in Figure 3, perforating bullet (being made up of perforating bullet shell case 7, perforating bullet powder charge 8, perforating bullet cavity liner 9), elastic ring 10, locating ring 11, cabin body 12, flexible explosive 13 and strong reductant 14 assembled form 1 unit, such unit is got up by required phase arrangement, connect detonating fuse, in the perforating gun 3 of packing into.Form the rifle string by such perforating gun, rifle string topmost connects pressure detonator, is lowered in the oil well casing 2.The rifle string that is connected to pressure detonator with tubing transmission to the precalculated position.Start pressure fan, when reaching the predetermined pressure of pressure detonator, detonator detonates, detonation wave reaches perforating bullet by detonating fuse, after perforating bullet detonates, ignites flexible explosive, promotes strong reductant and moves to axis, and strong reductant is sent into the duct by jet.In gun barrel, be pressed into air this moment continuously, after repeatedly blast takes place, consume till all strong reductants.
Claims (1)
1, a kind of perforation press cracking method is characterized in that utilizing the jet of perforating bullet that strong reductant is sent into the perforation tunnel: form jet after perforating bullet detonates, ignite flexible explosive simultaneously, the gas of flexible explosive blast is pushed strong reductant to axis; Said strong reductant comprises the material of alkali metal, alkaline-earth metal and other chance water generates hydrogen, also comprises the calcium carbide of meeting water generates acetylene, when producing hydrogen or acetylene gas, is pressed into air or oxygen in the duct, and it is blasted in the duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101256834A CN100504026C (en) | 2005-12-05 | 2005-12-05 | Perforation and cracking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101256834A CN100504026C (en) | 2005-12-05 | 2005-12-05 | Perforation and cracking method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1978864A CN1978864A (en) | 2007-06-13 |
| CN100504026C true CN100504026C (en) | 2009-06-24 |
Family
ID=38130149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101256834A Active CN100504026C (en) | 2005-12-05 | 2005-12-05 | Perforation and cracking method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100504026C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2744286C1 (en) * | 2020-12-04 | 2021-03-04 | Федеральное государственное автономное образовательное учреждение высшего образования «Северный (Арктический) федеральный университет имени М. В. Ломоносова» | Well bottomhole treatment device |
| CN116393227A (en) * | 2023-04-20 | 2023-07-07 | 重庆大学 | Hydrogen explosion ore crushing equipment and crushing method |
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2005
- 2005-12-05 CN CNB2005101256834A patent/CN100504026C/en active Active
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| Publication number | Publication date |
|---|---|
| CN1978864A (en) | 2007-06-13 |
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Address after: High tech Zone technology two road 710075 Shaanxi city of Xi'an province No. 70 Software Park Lege Tang room D301 Patentee after: Tongyuan Petroleum Science and Technology Group Co., Ltd. Address before: High tech Zone technology two road 710075 Shaanxi city of Xi'an province No. 70 Software Park Lege Tang room D301 Patentee before: Xi'an Tongyuan Petrotech Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
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Address after: No.1307, 13 / F, block a, No.51 Tangyan Road, hi tech Zone, Xi'an City, Shaanxi Province, 710075 Patentee after: Tongyuan Petroleum Science and Technology Group Co.,Ltd. Address before: High tech Zone technology two road 710075 Shaanxi city of Xi'an province No. 70 Software Park Lege Tang room D301 Patentee before: Tongyuan Petroleum Science and Technology Group Co.,Ltd. |
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