CN104033176B - Method for evaluating gas extraction effect of section by using gas extraction data of drill site - Google Patents

Abstract

The invention discloses a method for evaluating the gas extraction effect of a section by using gas extraction data of a drill site, which comprises the following steps: 1) by using X_tCalculating gas extraction cumulative quantity Q_tAnd the development trend f (t); 2) obtaining W by using geological information of gas₀And calculating the extraction standard accumulated quantity Q in the control range of the drill site by utilizing the extraction standard critical value W_c(ii) a 3) Using Q_tF (t) and W₀Evaluating the gas extraction effect in the control range of the drilling site; 4) using Q_tF (t) and Q_cCalculating the extraction standard reaching effect of the control range of the drill site; 5) using Q_t、f(t)、W′₀、C₁、C₂、L₁Evaluating the gas extraction effect of the adjacent area by evaluating the extraction standard-reaching critical value of the adjacent area. The invention firstly provides the method for analyzing and evaluating the control range of the drill site and the gas extraction effect of the adjacent area by utilizing the extraction measurement data of the drill site. The online evaluation of the extraction reaching the standard in the control range of the drill site and the pre-evaluation of the extraction effect in the adjacent area are realized.

Description

A kind of method utilizing drill site gas pumping data evaluation section gas pumping effect

Technical field

The present invention relates to the evaluation methodology of a kind of gas pumping effect, be specifically related to a kind of method utilizing drill site gas pumping data evaluation section gas pumping effect.

Background technology

Gas pumping is the key of control of coalmine gas, the generation of coal mine gas explosion, and the overwhelming majority is the erroneous judgement to gas pumping effect or does not draw attention and cause.Therefore how effectively Safety of Coal Mine Production is extremely important by monitoring, evaluation gas pumping effect.Current colliery is extremely original to the evaluation methodology of gas pumping effect, the gas density measuring extraction pipeline of going into the well generally by workman or reading gas pumping monitoring data, artificial calculating extraction amount, there is the defect of several aspect in this method: (1) workload is very big, extraction data are usually the data of more than 3 months, and data volume is big.(2) evaluation methodology does not account for the impact on zones of different extracting result of the coalbed gas geology information so that extracting result is evaluated not accurate enough.(3) existing evaluation methodology can only evaluate the region of existing extraction management, it is impossible to evaluates close region gas pumping effect, it is impossible to instruct shaft production.It is therefore desirable to study that a kind of automaticity is high, take into full account coalbed gas geology information and the method for extracting result of close region can be evaluated.

Summary of the invention

In consideration of it, the present invention provides a kind of method utilizing drill site gas pumping data evaluation section gas pumping effect, utilize drill site extraction continuous data, analyze, evaluate gas pumping effect and the close region extracting result of drill site span of control and adjacent domain.

It is an object of the invention to be realized by such technical scheme, a kind of method utilizing extraction online data in region to evaluate section extracting result, comprise the steps:

1) drill site extraction scale data X is utilized_tCalculating drill site extraction cumulative amount and development trend thereof, development trend utilizes the mode of numerical fitting to process；

Q_tDuring for accumulative extraction amount:

$Q_t=\underset{t=0}{\overset{t=i}{\mathrm{\Σ}}}{X}_t---\left(1\right)$

Q_tDuring for estimating extraction amount:

Q_t=f (t) (2)

X in formula_tDrill site gas pumping scale, Q_tDrill site gas pumping total amount, t is the extraction time；

2) the gas bearing capacity W of coalbed gas geology acquisition of information drill site span of control is utilized₀And calculate drill site span of control extraction cumulative amount Q up to standard in conjunction with drill site span of control extraction marginal value up to standard_c；

$Q_c=(W_{0\max }-W^{\′})\·\mathrm{\ρ}\·\underset{D}{\∫\∫}h\·\mathrm{d\σ}---\left(3\right)$

W in formula_0maxMaximum gas bearing capacity in drill site span of control；

W ' drill site span of control extraction marginal value up to standard；

ρ coal body unit weight；

σ area trace unit；

H coal is thick；

3) drill site extraction duration and drill site extraction cumulative amount and evaluation for developing trend drill site span of control gas pumping effect thereof are utilized；

$\mathrm{\η}=\frac{Q_t}{\underset{D}{\∫\∫}{W}_0\·\mathrm{\ρ}\·h\·\mathrm{d\σ}}---\left(4\right)$

W in formula₀Gas bearing capacity in drill site span of control；

η drill site span of control gas pumping rate；

4) drill site extraction cumulative amount and development trend thereof and drill site span of control extraction cumulative amount up to standard is utilized to calculate drill site span of control extraction effect up to standard；

Q_tDuring for accumulative extraction amount: Q_t≥Q_c, extraction is up to standard, and otherwise, extraction is not up to standard,t₁For extraction reaching standard time, L₁For boring dipstick metering；

Q_tDuring for estimating extraction amount: Q_t≥Q_c, extraction is up to standard, and otherwise, extraction is not up to standard,t₂For estimating extraction reaching standard time；

5) drill site span of control gas pumping effect assessment, close region extraction marginal value up to standard, close region gas reserves pre assessment close region extracting result are utilized；

$Q_c^{\′}={(W}_{0\max }^{\′}-W^{\′\′})\·\mathrm{\ρ}\·\underset{D}{\∫\∫}h\·\mathrm{d\σ}---\left(7\right)$

W ' in formula_0maxThe maximum gas bearing capacity of close region；

W " close region extraction marginal value up to standard；

Q′_cClose region extraction cumulative amount up to standard；

$\frac{Q_c}{Q_c^{\′}}=\frac{L_1\·t_2}{L_i\·t_i}---\left(8\right)$

L in formula_iClose region drill site characteristic parameter；

t_iClose region drill site is found time in advance.

Owing to have employed technique scheme, present invention have the advantage that: present invention firstly provides and utilized drill site extraction continuous data, analyze, evaluate gas pumping effect and the close region extracting result of drill site span of control and adjacent domain.Realize the pre assessment of drill site span of control extraction on-line evaluation up to standard and close region extracting result.

Accompanying drawing explanation

In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:

Fig. 1 is for utilizing drill site extraction monitoring data evaluation section extracting result method route figure.

Detailed description of the invention

Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；Should be appreciated that preferred embodiment is only for illustrating the present invention, rather than in order to limit the scope of the invention.

A kind of method utilizing drill site gas pumping data evaluation section gas pumping effect, specifically includes following steps:

1) drill site extraction scale data X is utilized_tCalculating drill site extraction cumulative amount and development trend (utilizing existing data, matching speculates Future Data, is development trend) thereof, development trend utilizes the mode of numerical fitting to process；

Q_tDuring for accumulative extraction amount:

$Q_t=\underset{t=0}{\overset{t=i}{\mathrm{\Σ}}}{X}_t---\left(1\right)$

Q_tDuring for estimating extraction amount:

Q_t=f (t) (2)

X in formula_tDrill site gas pumping scale, Q_tDrill site gas pumping total amount, t is the extraction time；

2) coalbed gas geology information is utilized to obtain (coalbed gas geology information includes coal seam gas-bearing capacity contour and coal seam coal thickness contour) the gas bearing capacity W of drill site span of control₀And calculate drill site span of control extraction cumulative amount Q up to standard in conjunction with drill site span of control extraction marginal value up to standard_c；

$Q_c=(W_{0\max }-W^{\′})\·\mathrm{\ρ}\·\underset{D}{\∫\∫}h\·\mathrm{d\σ}---\left(3\right)$

W in formula_0maxMaximum gas bearing capacity in drill site span of control；

W ' drill site span of control extraction marginal value up to standard；

ρ coal body unit weight；

σ area trace unit；

H coal is thick；

3) drill site extraction duration and drill site extraction cumulative amount and evaluation for developing trend drill site span of control gas pumping effect thereof are utilized；

$\mathrm{\η}=\frac{Q_t}{\underset{D}{\∫\∫}{W}_0\·\mathrm{\ρ}\·h\·\mathrm{d\σ}}---\left(4\right)$

W in formula₀Gas bearing capacity in drill site span of control；

η drill site span of control gas pumping rate；

4) drill site extraction cumulative amount and development trend thereof and drill site span of control extraction cumulative amount up to standard is utilized to calculate drill site span of control extraction effect up to standard；

Q_tDuring for accumulative extraction amount: Q_t≥Q_c, extraction is up to standard, and otherwise, extraction is not up to standard,t₁For extraction reaching standard time, L₁For boring dipstick metering；

Q_tDuring for estimating extraction amount: Q_t≥Q_c, extraction is up to standard, and otherwise, extraction is not up to standard,t₂For estimating extraction reaching standard time；

5) drill site span of control gas pumping effect assessment, close region extraction marginal value up to standard, close region gas reserves pre assessment close region extracting result are utilized；

$Q_c^{\′}={(W}_{0\max }^{\′}-W^{\′\′})\·\mathrm{\ρ}\·\underset{D}{\∫\∫}h\·\mathrm{d\σ}---\left(7\right)$

W ' in formula_0maxThe maximum gas bearing capacity of close region；

W " close region extraction marginal value up to standard；

Q′_cClose region extraction cumulative amount up to standard；

$\frac{Q_c}{Q_c^{\′}}=\frac{L_1\·t_2}{L_i\·t_i}---\left(8\right)$

L in formula_iClose region drill site characteristic parameter；

t_iClose region drill site is found time in advance.

Present invention firstly provides and utilized drill site extraction continuous data, analyzed, evaluated gas pumping effect and the close region extracting result of drill site span of control and adjacent domain.Realize the pre assessment of drill site span of control extraction on-line evaluation up to standard and close region extracting result.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, it is clear that the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (1)

1. the method utilizing drill site gas pumping data evaluation section gas pumping effect, it is characterised in that: comprise the steps:

1) drill site extraction scale data X is utilized_tCalculating drill site extraction cumulative amount and development trend thereof, development trend utilizes the mode of numerical fitting to process；

As drill site gas pumping total amount Q_tDuring for accumulative extraction amount:

$Q_t=\underset{t=0}{\overset{t=i}{\Σ}}{X}_t---\left(1\right)$

As drill site gas pumping total amount Q_tDuring for estimating extraction amount:

Q_t=f (t) (2)

In formula, t is the extraction time；

2) the gas bearing capacity W of coalbed gas geology acquisition of information drill site span of control is utilized₀And calculate drill site span of control extraction cumulative amount Q up to standard in conjunction with drill site span of control extraction marginal value up to standard_c；

$Q_c=(W_{0max}-W^{\′})\·\mathrm{\ρ}\·\underset{D}{\∫\∫}h\·d\mathrm{\σ}---\left(3\right)$

W in formula_0maxMaximum gas bearing capacity in drill site span of control；

W ' drill site span of control extraction marginal value up to standard；

ρ coal body unit weight；

σ area trace unit；

H coal is thick；

3) drill site extraction duration and drill site extraction cumulative amount and evaluation for developing trend drill site span of control gas pumping effect thereof are utilized；

$\mathrm{\η}=\frac{Q_t}{\underset{D}{\∫\∫}{W}_0\·\mathrm{\ρ}\·h\·d\mathrm{\σ}}---\left(4\right)$

W in formula₀Gas bearing capacity in drill site span of control；

η drill site span of control gas pumping rate；

4) drill site extraction cumulative amount and development trend thereof and drill site span of control extraction cumulative amount up to standard is utilized to calculate drill site span of control extraction effect up to standard；

As drill site gas pumping total amount Q_tDuring for accumulative extraction amount: Q_t≥Q_c, extraction is up to standard, and otherwise, extraction is not up to standard,t₁For extraction reaching standard time,

As drill site gas pumping total amount Q_tDuring for estimating extraction amount: Q_t≥Q_c, extraction is up to standard, and otherwise, extraction is not up to standard,t₂For estimating extraction reaching standard time；

5) drill site span of control gas pumping effect assessment, close region extraction marginal value up to standard, close region gas reserves pre assessment close region extracting result are utilized；

$Q_c^{\′}=(W_{0\max }^{\′}-W^{\′\′})\·\mathrm{\ρ}\underset{D}{\∫\∫}h\·d\mathrm{\σ}---\left(7\right)$

W ' in formula_0maxThe maximum gas bearing capacity of close region；

W " close region extraction marginal value up to standard；

Q′_cClose region extraction cumulative amount up to standard；

$\frac{Q_c}{Q_c^{\′}}=\frac{L_1\·t_2}{L_i\·t_i}---\left(8\right)$

L in formula_iClose region drill site characteristic parameter, L₁For boring dipstick metering；

t_iClose region drill site is found time in advance.