阅读说明：本技术 煤层气直井增产方法 (Coal bed gas straight well method for increasing ) 是由 张永民 刘美娟 张硕 于 2019-08-30 设计创作，主要内容包括：本发明涉及煤层气直井增产方法,以解决现有加砂水力压裂开采方法不仅会堵塞煤层的裂缝,而且还存在伤害煤层的问题。该煤层气直井增产方法,包括以下步骤：向煤层气井中注水直至井筒液柱高度到达100米,下入可控冲击波装备；利用可控冲击波装备对待改造煤层段的底板距煤层0.5m处进行冲击波作业；利用可控冲击波装备对待改造煤层段中厚度大于等于0.2m的夹矸进行冲击波作业；利用可控冲击波装备对待改造煤层段的顶板距煤层0.5m处进行冲击波作业；完成所有煤层段的作业后,起出可控冲击波装备。(The present invention relates to coal bed gas straight well method for increasing, injure coal seam to solve the problem of that existing plus sand hydraulic fracture mining method can not only block the crack in coal seam but also exist.The coal bed gas straight well method for increasing, comprising the following steps: until pit shaft liquid-column height reaches 100 meters, the controllable shock wave of tripping in is equipped for the water filling into coal bed gas well；Using controllable shock wave equipment to the bottom plate of coal seam section to be rebuilt away from progress shock wave operation at the 0.5m of coal seam；Dirt band using controllable shock wave equipment to thickness in coal seam section to be rebuilt more than or equal to 0.2m carries out shock wave operation；Using controllable shock wave equipment to the top plate of coal seam section to be rebuilt away from progress shock wave operation at the 0.5m of coal seam；After the operation for completing all coal seam sections, act controllable shock wave equipment.)

1. coal bed gas straight well method for increasing, it is characterised in that: include the following steps；

S1, until pit shaft liquid-column height reaches 100 meters, the controllable shock wave of tripping in equips (6) for the water filling into coal bed gas well；

S2, using controllable shock wave equipment (6) to the bottom plate (5) of coal seam section to be rebuilt away from progress shock wave work at the 0.5m of coal seam Industry；

S3, the dirt band (4) using controllable shock wave equipment (6) to thickness in coal seam section to be rebuilt more than or equal to 0.2m impact Wave operation；

S4, using controllable shock wave equipment (6) to the top plate (3) of coal seam section to be rebuilt away from progress shock wave work at the 0.5m of coal seam Industry；

S5 after the operation for completing all coal seam sections, acts controllable shock wave equipment (6).

Technical field

The invention belongs to energy extraction fields, and in particular to coal bed gas straight well method for increasing.

Background technique

The coal resources very abundant in China, coal reserves are maximum coal production states in the world up to 3.1 trillion tons or more And country of consumption.Coal annual output has reached 4,000,000,000 tons, and wherein the coal production of one third is prominent from high methane and high methane Coal seam.Coal bed gas (gas) disaster that coal generates is China's coal-mine injures and deaths, the largest loss and occurs most frequent great evil Sexual behavior event, seriously threatens the safety in production of mine.Coal bed gas still causes greenhouse effects, destroys the dirt of the atmospheric environments such as ozone layer The source of dye, greenhouse effects are 20~24 times of isometric carbon dioxide, and the damage capability to atmospheric ozone layer is carbon dioxide 7 times.

Although coal bed gas is the cover door of safety in production, and a kind of high fever, cleaning, convenient new energy.Currently, I The method of state's coal bed gas well exploitation is to add based on sand hydraulic fracturing, the use of the coal bed gas well that this method is exploited is about 18000 mouthfuls, Wherein have three/second is that stripper well, even not gas-producing well；The principal element for leading to this status is to use to add sand waterpower Fracturing technology.In fact, plus after sand hydraulic fracturing, coal bed gas well coal seam section state as shown in Figure 1, firstly, this method It is all more or less to inject foreign matter to coal seam 1, this will necessarily damage coal seam 1；Secondly, squeezed into coal seam when hydraulic fracturing 1 sand 2 is not routed to 1 deep of coal seam not only, is trapped in around pit shaft instead, forms sand column and wraps up and blocked up pit shaft real； Third, the sand 2 into coal seam 1 does not play preset support effect not only on a small quantity, the crack in coal seam 1 is filled instead It fills out, block.

Summary of the invention

The object of the present invention is to provide coal bed gas straight well method for increasing, to solve existing plus sand hydraulic fracture mining method not The crack in coal seam can be only blocked, but also there are problems that injuring coal seam.

To achieve the above object, the technical solution of the invention is as follows:

Coal bed gas straight well method for increasing, is characterized in that, includes the following steps；

S1, until pit shaft liquid-column height reaches 100 meters, the controllable shock wave of tripping in is equipped for the water filling into coal bed gas well；

S2, using controllable shock wave equipment to the bottom plate of coal seam section to be rebuilt away from progress shock wave operation at the 0.5m of coal seam；

S3, the dirt band using controllable shock wave equipment to thickness in coal seam section to be rebuilt more than or equal to 0.2m carry out shock wave Operation；

S4, using controllable shock wave equipment to the top plate of coal seam section to be rebuilt away from progress shock wave operation at the 0.5m of coal seam；

S5 after the operation for completing all coal seam sections, acts controllable shock wave equipment.

The invention has the benefit that

It, will 1. the sand column that the shock wave in the present invention is got around around pit shaft acts on the higher bottom plate of intensity, dirt band, top plate Shock wave imports coal seam depth, releases water lock, gas lock and blocking in coal seam, improves coal bed gas well yield and production capacity；It should Method is solved to be wrapped in around pit shaft through hydraulic fracturing rear support agent, and various well stimulations is caused no longer to work coal seam Problem.

2. controllable shock wave equipment of the present invention uses wire discharge-induced explosion driving energetic material and generates impact Wave technology, the technology can produce the shock wave higher than 120MPa.

3. the shock wave pressure peak value that the present invention uses is much larger than the compression strength of bottom plate, dirt band, top plate, by acting on Shock wave, after top plate, is directed at the coal seam in deep at dirt band by the bottom plate of unsupported dose of influence, in the case where not injuring coal seam, New crack is created in coal seam, releases the blocking in coal seam, and deformation coal trace links up deep fractures and pit shaft, to improve coal The desorption of layer, percolation ability, inhibit the adsorption capacity again in coal seam.

4. shock wave of the present invention is after bottom plate, dirt band, top plate import the coal seam in deep, meeting wave resistance in coal seam Stronger shearing force is generated on the biggish medium interface of anti-difference, and then is removed coal seam hole, crack, is attached in seepage channel The sundries on coal petrography surface plays the role of releasing coal seam blocking, improves coal seam percolation ability.

5. the shock wave of the imported deep fractures of the present invention, after multiplicating effect, so that coal petrography molecule and adsorbed gas Model Dehua bond fission of body, or even destroyed strongly, which accelerates the desorption of coal bed gas, it is suppressed that coal seam adsorption energy again Power.

Detailed description of the invention

Fig. 1 is the coal face figure used after adding the construction of sand hydraulic fracturing process；

Fig. 2 is the sectional view using coal bed gas straight well method for increasing of the present invention construction；

Fig. 3 is the waveform diagram of controllable shock wave equipment；

Fig. 4 is operation process chart of the invention；

Fig. 5 is to prolong 3-32-18 well mining data statistics figure；

Fig. 6 is to prolong 3-32-20 well mining data statistics figure；

Fig. 7 is to prolong 6 well mining data statistics figures.

Appended drawing reference is as follows:

The coal seam 1-, 2- sand, 3- top plate, 4- dirt band, 5- bottom plate, the controllable shock wave equipment of 6-, 7- position indicator, 8- well head Device.

Specific embodiment

The contents of the present invention are described in further detail below in conjunction with the drawings and specific embodiments:

A kind of coal bed gas straight well method for increasing, as shown in Figures 2 to 4, comprising the following steps:

The controllable shock wave waveform diagram that Fig. 3 is exported by the controllable shock wave equipment 6 of the present embodiment.

Before operation, collection is gone through to the log data of operation coal bed gas well, the time-history curves of hydraulic fracturing, production and transformation History, these data of block production status analysis drop produce reason, the shock wave number being set on each setting.

As shown in figure 4, S1, acts all tubing strings in underground；

It will include that pump, tubing string, the bar that draws water all rise in pit shaft before operation, so that the underground of controllable shock wave equipment 6 Equipment can descend well operations.

S2 checks whether coal bed gas well casing is clear and coherent using gauguste cutter；

The diameter of usual coal bed gas well casing is 139.7mm, and the diameter that controllable shock wave equips 6 underground equipments is 102mm, Since coal bed gas well casing may have the fortuitous events such as deformation, so, before controllable shock wave 6 underground equipments of equipment are gone into the well, need The steel pipe of diameter 102mm, length 7m is used to go into the well as gauguste cutter examination to 1 position of coal seam, to ensure controllable shock wave equipment 6 Underground equipment can smoothly go into the well to 1 position of coal seam.

S3, the water filling into coal bed gas well is until pit shaft liquid-column height reaches 100 meters；

When controllable 6 work of shock wave equipment, need water as medium, and the salinity of mine water is higher, it is different from water quality Surface water meet after can produce the chemical reaction of water complexity, lead to undesirable consequence, to avoid this problem present invention from utilizing this Well or the produced water of offset well, are injected into pit shaft before operation, to eliminate adverse reaction caused by different quality.

The energy that the pressure of water column can oppress the shock wave that controllable shock wave equipment 6 generates in pit shaft concentrate on controllably Shock wave equips 6 vertical directions, is more advantageous to the effect for playing shock wave, is filled the water before operation thus until pit shaft fluid column Height reaches 100 meters, then the underground equipment of controllable shock wave equipment 6 is sent to coal seam 1, and pit shaft is always maintained in operation process In water level at 100 meters of pit shaft liquid-column height.

S4, by the coal seam section to be rebuilt that controllable impact 6 tripping in of wave apparatus is most deep into coal bed gas well；

After wellhead assembly 8, coiled tubing and its control pipeline are installed in place, and to its each component, each coupling part, press Its rated operating pressure carries out pressure testing, it is ensured that wellhead assembly 8, coiled tubing can work normally.

By controllable shock wave equipment 6 connect with position indicator 7 after, be connected to the coiled tubing other end, to entire supplying system into Row discharge test executes following steps after test passes.

6 tool pipes of controllable shock wave equipment are transferred by cable and seal in well, are filled controllable shock wave by the position indicator 7 Standby 6 push to most deep coal seam section to be rebuilt；

S5 equips the bottom plate 5 of 6 pairs of coal seam sections to be rebuilt away from progress shock wave work at the 0.5m of coal seam using controllable shock wave Industry；Dirt band 4 of the thickness more than or equal to 0.2m in 6 pairs of coal seam sections to be rebuilt, which is equipped, using controllable shock wave carries out shock wave operation； The top plate 3 of 6 pairs of coal seam sections to be rebuilt is equipped away from progress shock wave operation at the 0.5m of coal seam using controllable shock wave；

Controllable shock wave is equipped into 6 tripping in into coal bed gas well at the bottom plate 5 in coal seam to be rebuilt, and controllable shock wave is filled Standby 6 shock wave emission mouth is directed at position of the bottom plate 5 away from bottom plate 5 and 0.5 meter of coal seam intersection, to carrying out setting number at this Shock wave operation.

Controllable shock wave equipment 6 is above mentioned into coal seam section to be rebuilt at dirt band 4 of the thickness more than or equal to 0.2m, and will be controllable The middle position of the shock wave emission mouth alignment dirt band 4 of shock wave equipment 6, the shock wave operation to setting number is carried out at this.

Controllable shock wave equipment 6 is above mentioned at seam roof 3 to be rebuilt, and controllable shock wave is equipped to 6 shock wave Emission port is directed at position of the top plate 3 away from top plate 3 and 0.5 meter of coal seam intersection, the shock wave operation to setting number is carried out at this.

According to preset shock wave operation scheme to bottom plate 5 (bottom plate 5 in coal seam 1), the folder in coal seam section to be rebuilt Cash 4 (dirt band 4 in coal seam 1), top plate 3 (top plate 3 in coal seam 1) carry out shock wave operation, shock wave using the water in coal seam 1 as The medium of energy conversion and transmitting, avoids the problem of injuring coal seam 1, is imported shock wave by bottom plate 5, dirt band 4, top plate 3 1 deep of coal seam can generate stronger shearing force on the biggish medium interface of wave impedance difference in coal seam 1, and then remove coal seam 1 Hole, crack are attached to the sundries on coal petrography surface in seepage channel, while creating new crack in coal seam 1, release coal seam 1 Blocking, deformation coal trace links up deep fractures 1 and pit shaft, to improve the desorption in coal seam 1, percolation ability, inhibits coal seam 1 Adsorption capacity again.

The shock wave for importing deep fractures 1, after multiplicating effect, so that model Dehua of coal petrography molecule and adsorbed gas Bond fission, or even destroyed strongly, which accelerates the desorption of coal bed gas, it is suppressed that the adsorption capacity again of coal seam 1.

S6 carries out shock wave operation to next coal seam section to be rebuilt in a manner of returning on successively；

After the shock wave operation for completing a upper coal seam section, controllable shock wave is above mentioned by position indicator 7 and equips 6 downhole tools String makes controllable shock wave equipment 6 be located at adjacent coal seam section to be rebuilt, and carries out shock wave operation；

By it is same successively on return in a manner of shock wave operation is implemented to remaining coal seam section to be rebuilt.

S7 after the operation for completing all coal seam sections, acts controllable impact wave apparatus 6；

By it is same successively on return in a manner of complete the operation of all coal seam sections after, above mention controllable shock wave and equip 6 underground works Tool string, dismantles wellhead assembly 8, slings controllable shock wave by crane and equips 6 underground tool strings, and controllable shock wave equipment 6 is mentioned Well head out removes controllable shock wave equipment 6 and position indicator 7, and successively removes each tool, puts the tools away.

S8 puts into mining as required.

Again the pump in tripping in coal bed gas well, tubing string and the bar that draws water, according to the analysis before operation to 1 physical parameter of coal seam, In conjunction with the variation of coal bed gas well in operation process, mining is put into using the technique of strength mining or slow mining.

Fig. 5 is that Yan3-32-18Jing uses the post-job mining data statistics figure of method of the invention, as shown by arrows, is made Daily output is 500 sides before industry, and daily output is 2400 sides after operation, is played significantly using method of the invention to the transformation in coal seam 1 Effect.

Fig. 6 is that Yan3-32-20Jing uses the post-job mining data statistics figure of method of the invention, as shown by arrows, is made Daily output is 500 sides before industry, and daily output is 3000 sides after operation, is played significantly using method of the invention to the transformation in coal seam 1 Effect.

Fig. 7 is that Yan6Jing uses the post-job mining data statistics figure of method of the invention, as shown by arrows, the operation day before yesterday Producing is 300 sides, and daily output is 1500 sides after operation, and maintains the time of the yield longer, using method of the invention to coal seam 1 Transformation plays significant effect.

The sand column that shock wave in the present invention is got around around pit shaft acts on the higher bottom plate 5 of intensity, dirt band 4, top plate 3, Shock wave is imported into 1 deep of coal seam, water lock, gas lock and blocking in coal seam 1 is relieved, substantially increases coal bed gas well yield And production capacity.

The above description is only an embodiment of the present invention, and it is not intended to limit the protection scope of the present invention, all to utilize the present invention Equivalent structure transformation made by specification and accompanying drawing content, is applied directly or indirectly in other relevant technical fields, and wraps It includes in scope of patent protection of the invention.