CN104389636B - Rock cross-cut coal uncovering high-pressure water jet flow reaming pressure relieving and outburst prevention effect evaluation method - Google Patents

Abstract

The invention provides a rock cross-cut coal uncovering high-pressure water jet flow reaming pressure relieving and outburst prevention effect evaluation method, which comprises the following steps that: drill holes are uniformly arranged in a coal uncovering region in an outburst prevention measure control range; the reaming uniformity and the drilling cutting discharging rate are obtained; and the evaluation on the high-pressure water jet flow reaming pressure relieving effect and the coal mine gas outburst prevention effect is realized according to a result of whether the reaming uniformity is in a preset range or not and whether the drilling cutting discharging rate exceeds the preset threshold or not. The method is simple; the operation is easy; the adaptability is high; the problem of great errors or index measuring incapability due to dense drill holes in the coal uncovering region is avoided; and the accuracy degree of a measured value is ensured.

Description

Stone door punching coal high-pressure water jet reaming release and protrusion-dispelling effect evaluation method

Technical field

The present invention relates to colliery field, more particularly, to a kind of stone door punching coal high-pressure water jet reaming release and protrusion-dispelling effect are commented Valency method.

Background technology

Colliery field is the important component part of China's economic development, and the safety issue in colliery field is subject to always in recent years To people extensive concern it is well known that because gain exposed coal outburst hazard is high, exposed coal quantities is big, the duration is longer Etc. reason, seriously constrain the safe and efficient production of mine.

For the feature that China's coal-mine coal seam is soft, breathability is low, progressively deepen with exploitation and crustal stress significantly increases, In order to improve exposed coal area hole pumping and mining effect, the commonly used high-pressure water jet reaming of China's mine stone door punching coal process is unloaded Pressure, anti-reflection measure, and the referring mainly to as region measure effect evaluation using remaining gas pressure, gas remainder quantity and extraction rate Mark.But existing evaluation methodology and index are primarily present the deficiency of following two aspects:

1. do not consider the uniformity of reaming, extraction, because chambering process is limited, the reaming effect of different borings may difference Property is larger, and then leads to the release effect in each boring control area coal seam and extracting result to be not quite similar, thus in overall extraction When up to standard, may locally still suffer from region not up to standard；

2. reaming release and protrusion-dispelling effect are not evaluated, existing release and protrusion-dispelling effect evaluation method are mainly from gas Extracting result be analyzed, and not from stress (crustal stress, gas interior energy) release effect release and protrusion-dispelling effect are carried out Evaluate.

Content of the invention

In view of this, the present invention provides a kind of stone door punching coal high-pressure water jet reaming release and protrusion-dispelling effect evaluation method, Strengthen the anti-reflection measure of release for stone door punching coal high-pressure water jet reaming, on the basis of the protrusion-dispelling evaluation index of existing rules and regulations On, by the use of uniform drilling cuttings of discharging as a kind of new evaluation methodology of stone door punching coal region outburst prevention measures effect.

Stone door punching coal high-pressure water jet reaming release and the evaluation methodology of protrusion-dispelling effect that the present invention provides, comprising: obtain The reaming uniformity and discharge drilling cuttings rate, the described reaming uniformity includes average counter bore diameter and counter bore diameter standard deviation, according to expansion Whether bore dia standard deviation meets presets acceptability limit and discharges whether drilling cuttings rate exceeds threshold value set in advance, realizes Evaluation to high-pressure water jet reaming release effect and mine gas protrusion-dispelling effect.

Further, described discharge drilling cuttings rate utilizes equation below to obtain:

$\mathrm{\η}=\frac{t^{\′}}{t}$

Wherein t ' is the ickings amount that boring expands, and t is the coal seam reserves in the outburst prevention measures span of control of exposed coal region, and η is Discharge drilling cuttings rate.

Further, the described threshold value discharging drilling cuttings rate is according to specifically actual geologic parameter and the ambient parameter determination of exposed coal area.

Further, described counter bore diameter standard deviation utilizes equation below to obtain:

$s_d=\sqrt{\frac{1}{n}\underset{i}{\overset{n}{\mathrm{\σ}}}{(d_i-\stackrel{\&overbar;}{d})}^2}$

Wherein, s_dFor counter bore diameter standard deviation,The average counter bore diameter of Gongwei, d_iOften creep into the equivalent straight of 0.5m for boring Footpath, n is the number of times of same boring drilling.

Further, described average counter bore diameterCreep into the coal that expand by complete opening segment length, the density of coal and every time Measure and to calculate acquisition.

Beneficial effects of the present invention: release and protrusion-dispelling are imitated by the newly-increased reaming uniformity and discharge drilling cuttings rate two indices Fruit is evaluated, method simple it is easy to operation, strong applicability, it is to avoid lead to index cannot survey because the boring of exposed coal region is intensive Fixed or error larger it is ensured that the accuracy of measured value；On the basis of the protrusion-dispelling evaluation index using existing rules and regulations, pin The anti-reflection measure of release is strengthened to stone door punching coal high-pressure water jet reaming, increases newly and uniformly discharge drilling cuttings rate index, realize to mine watt This release effect and protrusion-dispelling effect carry out overall merit.

Brief description

The invention will be further described with reference to the accompanying drawings and examples:

Fig. 1 is the schematic flow sheet of the present embodiment.

Fig. 2 is the principle schematic of the present invention

Specific embodiment

As shown in Figure 1, 2, the present invention provides stone door punching coal high-pressure water jet reaming release and the evaluation side of protrusion-dispelling effect Method, comprising:

A. uniformly hole in the exposed coal region in outburst prevention measures span of control；The spacing of boring is impact boring release effect An important parameter, and the spacing of wells more small bore release effect is better.With the increase of buried depth, coal body pressure at right angle increases Greatly, boring release effect is become better and better.

B. detect the diameter in each hole and discharge drilling cuttings rate, and draw the reaming uniformity according to the diameter in each hole；

C. drilling cuttings rate will be discharged and the reaming uniformity will discharge drilling cuttings rate threshold value and reaming uniformity threshold value with default respectively It is compared, if the reaming uniformity is less than reaming uniformity threshold value and discharges drilling cuttings rate in discharge drilling cuttings rate threshold value, judge to unload Pressure and protrusion-dispelling are respond well.

In the present embodiment, the number of times of statistics same boring drilling, and the equivalent of 0.5m is often crept in survey calculation boring Diameter, using equation below acquisition counter bore diameter standard deviation:

$s_d=\sqrt{\frac{1}{n}\underset{i}{\overset{n}{\mathrm{\σ}}}{(d_i-\stackrel{\&overbar;}{d})}^2}---\left(1\right)$

Wherein, s_dFor counter bore diameter standard deviation,For average counter bore diameter, d_iOften creep into the equivalent diameter of 0.5m for boring, N is the number of times of drilling.

In the present embodiment, due to the equivalent diameter of 0.5m is often crept in boring and each drilling 0.5m expands coal measurer just like Lower relation:

$\mathrm{\π}{\left(\frac{d_i}{2}\right)}^2{l}_i\mathrm{\σ}=t_i---\left(2\right)$

Wherein, l_iCreep into length, l in the present embodiment for boring every time_iLength value be 0.5m, d_iOften creep into for boring The equivalent diameter of 0.5m, ρ is the density of coal, t_iThe coal amount expanding for each drilling 0.5m.

And then draw:

$d_i=\sqrt{\frac{{4t}_i}{{\mathrm{\πl}}_i\mathrm{\ρ}}}---\left(3\right)$

Therefore, the complete opening segment length according to measurement and the coal amount that expands are it can be deduced that average counter bore diameter

By the average counter bore diameter obtainingSubstitute in formula (1) and obtain counter bore diameter standard deviation s_d

In the present embodiment, using statistical method, the reaming uniformity can be evaluated by as-built drawing of holing, using etc. Effect diameter evaluates the reaming uniformity, when counter bore diameter standard deviation s_dValue in the range of ± 0.15m, that is, the reaming uniformity meet will Ask.So can avoid due to the inhomogeneities of reaming, extraction, the release effect in each boring control area coal seam leading to and taking out Adopt the difference of effect, in turn result in the phenomenon yet suffering from that on the basis of overall extraction is up to standard local does not reach target area.

In the present embodiment, measurement boring expands the coal seam reserves in ickings amount and exposed coal region outburst prevention measures span of control, And using equation below acquisition discharge drilling cuttings rate:

$\mathrm{\η}=\frac{t^{\′}}{t}---\left(4\right)$

Wherein t ' is the ickings amount that boring expands, and t is the coal seam reserves in the outburst prevention measures span of control of exposed coal region, and η is Discharge drilling cuttings rate.

In the outburst prevention measures span of control of exposed coal region, coal seam reserves t utilizes equation below to obtain:

$t=\mathrm{\π}{\left(\frac{\stackrel{\&overbar;}{d}}{2}\right)}^2\mathrm{l\ρ}---\left(5\right)$

Wherein, l is complete opening segment length,For average counter bore diameter, ρ is the density of coal.

In the present embodiment, for how arranging the threshold value discharging drilling cuttings rate, exposed coal regional coal-seam can be considered and bury The factors such as depth, coal seam physico-mechanical properties, crustal stress of hiding determine.For the region that can investigate, can be investigated using actual Method determine that uniformly to discharge ickings rate critical, the region investigated is difficult to for some, when not investigating out marginal value, permissible The uniform threshold value discharging drilling cuttings rate is carried out threshold value value according to 2.5%, if the reaming uniformity is in reaming uniformity threshold range Interior and discharge drilling cuttings rate is less than and discharges drilling cuttings rate threshold value, you can judges that release and protrusion-dispelling are respond well, meets security requirement.

In the present embodiment, using on the basis of existing evaluating, increasing the reaming uniformity and discharging drilling cuttings rate, to comment Valency stone door punching coal high-pressure water jet reaming release effect and protrusion-dispelling effect, not only method is simple, easy to operate, strong applicability, and And avoid and lead to index cannot measure because the boring of exposed coal region is intensive or error is big, the accuracy of mensure is high, substantially increases The reliability measuring.

Finally illustrate, above example only in order to technical scheme to be described and unrestricted, although with reference to relatively Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention Art scheme is modified or equivalent, the objective without deviating from technical solution of the present invention and scope, and it all should be covered at this In the middle of the right of invention.

Claims (3)

1. a kind of stone door punching coal high-pressure water jet reaming release and protrusion-dispelling effect evaluation methodology it is characterised in that:

A. uniformly hole in the exposed coal region in outburst prevention measures span of control；

B. detect the diameter in each hole and discharge drilling cuttings rate, and obtain the reaming uniformity according to the diameter in each hole,

Using equation below acquisition discharge drilling cuttings rate:

$\mathrm{\η}=\frac{t^{\′}}{t}$

Wherein t ' is the ickings amount that boring expands, and t is the coal seam reserves in the outburst prevention measures span of control of exposed coal region, and η is to discharge Drilling cuttings rate；

The described reaming uniformity includes average counter bore diameter and counter bore diameter standard deviation, and described counter bore diameter standard deviation is using as follows Formula obtains:

$s_d=\sqrt{\frac{1}{n}\underset{i}{\overset{n}{\σ}}{(d_i-\stackrel{\&overbar;}{d})}^2}$

Wherein, s_dFor counter bore diameter standard deviation,For average counter bore diameter, d_iCreep into the equivalent of equidistant length for boring every time Diameter, n is the number of times of drilling, and i represents the integer between 1～n；

C. discharge drilling cuttings rate and the reaming uniformity are carried out with default discharge drilling cuttings rate threshold value and reaming uniformity threshold value respectively Relatively, if the reaming uniformity and discharges drilling cuttings rate less than discharging drilling cuttings rate threshold value in reaming uniformity threshold range, judge to unload Pressure and protrusion-dispelling are respond well.

2. the evaluation methodology of stone door punching coal high-pressure water jet reaming release and protrusion-dispelling effect according to claim 1, its feature It is: the described threshold value discharging drilling cuttings rate determines according to the actual geologic parameter in exposed coal region and ambient parameter.

3. the evaluation methodology of stone door punching coal high-pressure water jet reaming release and protrusion-dispelling effect according to claim 1, its feature It is: described average counter bore diameterThe coal amount by measurement complete opening segment length, expanding and the density of coal obtain.