Research on Synthetical Production Proration of Deep Gas Well in Xu Jiaweizi Block Considering Multi Influential Factors

doi:10.4236/sgre.2012.32021

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Smart Grid and Renewable Energy, 2012, 3, 148-151

http://dx.doi.org/10.4236/sgre.2012.32021 Published Online May 2012 (http://www.SciRP.org/journal/sgre) 1

Research on Synthetical Production Proration of Deep Gas

Well in Xu Jiaweizi Block Considering Multi Influential

Factors

Qingbo Zhao

Northeast Petroleum University, Daqing, China.

Email: lywe [email protected]

Received January 14th, 2012; revised May 3rd, 2012; accepted May 12th, 2012

ABSTRACT

Xu deep volcanic gas reservoir is typical of complex lithology, severe inhomogeneity, big difficulty to extract. Pressure

sensitivity always exists in gas reservoirs. Prorating productio n is too high or low, causing problems, as for the en ergy

loss, reservoir damage, bottom effusion, thus lowing the gas productivity and affecting development benefit. So it have

to research on a new reasonably production proration method considering multi influential factors. It is a reasonably

production proration method considering multi influential factors in Xu gas reservoir, with guidelines such as capacity

use, pressure draw down, gas recovery rate, water out and throughout water data is reasonably, so we can long term use

it to guide gas field exploitation.

Keywords: Deep Gas Wells; Multifactor; AOF; Synthetical Production Proration

1. Preface

Xu deep gas reservoir is located in Anda territory of

Heilongjiang province. It is a volcanic rock gas field of

billions of reserves in the domestic, which is the main

part of the exploitation of Petrochina daqing natural gas

company. At present, the hydro carbon gas reservoir of xu

deep gas reservoir has submited 1193.36 × 108 m

3 of

verified geological reserves, including 202.7 km2, of gas

that contains six blocks namely Sheng Ping, Xing Cheng,

Chang De, Wei Shen 5, Wang Jia Tun deep and Zhao

Zhou west. So far Xu deep gas reservoir has invested 30

production Wells and 148 .18 × 108 m3 reserves.

Xu deep volcanic gas reservoir has a complex lithology

and strong heterogeneity which make it difficult to exploit,

and there is no successful development experiences so far.

According to the existing production wells, edge water or

bottom water exists in most gas reservoirs. If the way of

exploitation is taken unreasonably, waterflooding will

easyly emerges. Gas reservoirs is always pressure-sen-

sitive. Prorating production too high or low, can lead to a

series of problems such as energy loss, reservoir damage,

andbottom effusion, thus will lower the gas productivity

and affect the development benefit. Prorating production

of inital gas wells is often 1/4 to 1/6 of AOF, it has certain

artificial while lack scientific basis. Most study schemes

of optimal prorating production recently only consider the

single limiting factors [1], which can’t meet the other

indexs of developing optimal gas reservoir. So it is ne-

cessary to carry out comprehensive researches, determine

reasonable method, and control the mining method of gas

reservoir. In this way, the gas well production can work

in reasonable production, refrain gas reserve from water-

flooding. So we can make sure that the gas reservoir has

a high recovery degree.

In the realization of the gas field in prorating production,

domestic has the following several ways: gas extraction

curve method, the optimization method, the material ba-

lance method, Production history to legal method, num-

erical simulation method, experience method and so on [2].

Throughout the present situation and development at home

and abroad of the gas well (reservoir) production research,

we can know that there are a lot of mature researches for

each type of gas reservoir of single well production dy-

namic analysis and pressure drop change process. To the

condensate gas reservoir of oil and gas system in the

actual form, seepage flow characteristic, the development

of the dynamic and the different production period of

optimization research in single well production process

are to be further discussed; But for the study of each

single well production in optimization constitute research

of the whole gas reservoir production configuration is a

new field of learning.

Research on Synthetical Production Proration of Deep Gas Well in Xu Jiaweizi

Block Considering Multi Influential Factors 149

2. Research on Synthetical Production

Proration

2.1. Energy Use with Reasonable Production

Proration

The coordination of gas well is refered to joining re-

lationship in the process of gas flow. To make the gas

well product stability, in the system of gas well, each

connected flow process must be coordinated [3]. The co-

ordination conditions is: 1) the mass flow of each cohe-

sion in the process are equal; 2) the rest pressure of pre-

vious process is enough to overcome the pressure con-

sumption of the next process, that is to say, the rest pre-

ssure of previous process should be equal to the starting

pressure of the next process. Node system analysis is co-

ordinating concept in the development of the application.

Gas well node system analysis can be quickly and easily

changed the system parameters to realize the dynamic

simulation of the gas well and be convenient to gain the

coordinate gas well production.

With bottom hole for node is the most commonly used

method of analysis. Set the bottom hole node make the

whole gas well system as Lifting oil tubing, ground line

two parts, As sh own in Figure 1 shows. The part of node

inflowing is the seepage for gas, with inflows dynamic

(IPR) curve to describe. From the central of gas layer to

ground separator, the pressure drop is the sum of lifting

oil pipeline pressure drop and the ground pressure drop.

The upstream and downstream pressure of node is:

Nod e into the pressure:

wfrsc sc

ppaqbq

(1)

Node outflow pressure:

tubingground pipelinewf sep

pp pp  (2)

In the coordinating chart draw the inflowing dynamic

curve, and the outflowing dynamic (pwf-q) curve, It is

also IPR curve and OPR curve, make the two curve be

drawed in the same coordinate figure, The intersection

point of the two curve is the coordination bottom-hole

flowing pressure and production of the gas system, As it

is shown in Figure 1.

2.2. Gas Recovery Rate with Equilibrium

Production

The determination of single well control reserves occupies

an important position in the development process of gas

reservoir, single well production of Gas well is the im-

portant parameters in analysising and planning gas field

development [4]. When Matching production need to

achieve a balanced recovery speed, ensure reasonable de-

velopment, long-term and stable production of gas fiel d.

The single well control reserves calculation formula:

G (3)

Recoverable reserves:

ABQ



 (4)

2.3. Safe in Prorating Production with Carry

Liquid Flow

Critical carry liquid output:

c2.5 10

 (5)

The parameters that influence the critical flow rate and

the critical flow velocity are: Gas to liquid density, Gas

to liquid surface tens ion, gas compression coefficient, oil

tubing cross-sectional area, pressure, temperature, gas

production and liquid production and so on. But in the

given production situation, Calculated point temperature

nd pressure decided other parameters [5]. a

Figure 1. Compatible production general schematic drawing of gas well.

Research on Synthetical Production Proration of Deep Gas Well in Xu Jiaweizi

Block Considering Multi Influential Factors

150

Temperature and pressure for the influence of Carry

critical liquid flow is the opposite (see Figure 2), From

the bottom of the well to the top of the well, temperature

drop make the critical fluid flow value increases, but

pressure drop make the critical fluid flow value decrease,

so from the bottom of the well to the top of the well, the

increase and decrease of the critical value depends on the

influence of the temperature and pressure which accounts

for a leading role. From the bottom of the well to the

mouth of the well, Because of the temperature of the

lower strata is higher, he temperature of the initial gas

loss is little, and the pressure loss is bigger. At the same

time, the pressure is the leader factor.

Above the analysis about typical data in Xu Jiaweizi,

we can conclude that the control conditions of carry

critical liquid flow may be in bottom, or in top. Calculate

the carry critical liquid flow of the bottom well and the

top well, and then converted to the carry critical liquid

flow under the standard condition, the larger value can be

as the critical fluid production of the whole well.

Figure 2. Reguler pattern of critical flow rate and critical

flow velocity affect by temperature and pressure.

2.4. Bottom Water Coning with Safety Prodction

One of the main tasks of Bottom water drive gas re-

servoir engineering research is to determine the critical

production and breakthrough time of the gas well [6], If

the prorating production of the gas well is more than the

critical production of the gas well, the well must be

breakthrough, then when design reasonable production,

take the critical production as a constraint, control its rea-

sonable yield less than critical p rodu ction , so as to realize

the mining without water.

Bottom water coning critical production calculation

formula:

0.5

ahk



 





(6)

0.7311 1.94341



 a

(7)

0.8467 hwg









 (8)

3. Mine Field Example

Above all comprehensive plan of proration production,

combine with oil well outwater dynamic analysis, use the

theory of the comprehensive factors to deter me the final

match production plan of the gas well with corresponding

gas block (see Table 1).

4. Conclusion and Understanding

1) The volcanic reservoir heterogeneity is extremely

strong, and the relationship between gas and water is

complex, gas well with the general policy in reasonable

should be “for hole and appropriate, take into account the

global”.

2) Make the single well with reasonable production

principle, that is, based on the single well control reserves,

it should get the speed of recovery balance. According to

the productivity equation, relative to the energy, it should

get to the pressure drop balance. According to the system

analysis of gas well node, make full use of the formation

energy reasonable [7]. With the requirements of the liquid

is greater than the minimum yield, avoiding bottom

effusion as far as possible; Less than bottom water coning

critical production, prevent bottom water coning cracks

along the high angle to the bottom; According to the dy-

namic analysis results of gas well water, adjust the yield,

slow down the output of the water.

3) In this paper, the study is for the deep gas of xu

multi-factors comprehensive method with production,

considering the o pen-flow capacity, gas speed equilibrium,

pressure drop balanced, energy reasonable be used, liquid

security, bottom water coning and so on. It is a more sci-

Research on Synthetical Production Proration of Deep Gas Well in Xu Jiaweizi

Block Considering Multi Influential Factors 151

Table 1. Proration production under multi influe ntial fac t or s (104 m3).

Well number AOF 1/5 PPDB PGSE PRUE PBWC PCCL UPDW

Xu deep 1-2 well 11.610 14.5 14.5 14.5 12 12 12

Xu deep 1-1 well 10.323 12.9 12.9 12.9 12.9 12.9 10

Xu deep 6 well 17.893 15 15 15 15 15 14

Xu deep 6-1 well 2.370 4 5 5 5 5 5

Xu deep 603 well 7.090 6 5.5 5.5 5.5 5.5 5.5

Xu deep 1 well 16.370 16 16 16 16 16 15

Xu deep 1-201 well 8.056 8 8 8 8 8 8

Xu deep 1-304 well 16.569 14 12.5 12.5 12.5 12.5 12. 5

Xu deep 6-104 well 11.930 11.5 1 1.5 11.5 10.5 10.5 10.5

Xu deep 6-105 well 12.297 12.5 1 2.5 12.5 10 10 10

Xu deep 1-101 well 13.578 12 12 12 10 10 10

Xu deep 1-3 well 19.385 20 19 19 18 18 18

Xu deep 1-4 well 3.037 3.7 4 4 4 5 5

Xu deep 6-101well 6.923 8 8 8 8 8 8

Xu deep 6-107 well 2.358 2.9 3.75 3.75 3.75 4 .5 4.5

Xu deep 6-209 well 2.109 2.6 3.5 3.5 3.5 4 4

Xu deep 6-3 well 2.652 3.3 4.5 4.5 4.5 4.5 4.5

Xu deep 6-2 well 1.761 2.5 3.5 3.5 3.5 3.5 3.5

Xu deep 6-211 well 2.589 3.2 4 4 4 4 4

Open-flow capacity (AOF); Prorating production with pressure drop of balance (PPDB); Prorating production with Gas speed equilibrium (PGSE); Prorating

production with Rational use of energy (PRUE); Prorating production with Bottom water coning (PBWC); Prorating production with carry critical liq uid flow

(PCCL); Ultimate prorating prod uction with dynamicwater (UPDW).

entific and reasonable method, make the gas well produc-

tion tends to optimization. According to match production

results, The daily output of Xu block 19 Wells deep gas

scale is 164 × 104 m3, The daily output of average single

well gas is 8.631579 × 104 m3.

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