CN110766562B - Method for determining oil well interval pumping time - Google Patents
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Abstract
The invention discloses a method for determining pumping time between oil wells, which comprises the following steps of firstly, restoring the working fluid level depth H during balance sb And the working fluid level depth H at production equilibrium Lb Measuring; secondly, determining the well stopping recovery time, and giving the initial well stopping recovery time t s And error parameter epsilon, calculating to obtain the recovered working fluid level depth h corresponding to the time s If h is satisfied s ‑H sb If epsilon is less, the well shut-in recovery time is t s Thirdly, determining the well opening production time, and initially giving the well opening time t L Calculating to obtain the well opening t L Corresponding to the working fluid level depth h after hour L Obtaining the amount of liquid produced Q and the average amount of liquid produced Q on the ground when the production is balanced u If H is satisfied Lb ‑h L < ε, and Q u t L ＞＝Q(t L +t s ) Then the well production time can be determined as t L And fourthly, closing the well again and closing the well according to the well closing t s Hour, production by opening the well t L The intermittent pumping operation is repeated regularly in hours until the intermittent pumping period needs to be determined again. The intermittent pumping period of the oil well is determined according to the existing oil well testing data and production data in the normal working process of the oil well, so that the labor intensity and the testing cost of staff testing are reduced.
Description
Technical Field
The invention belongs to the field of oil extraction processes, and particularly relates to a method for determining the interval pumping time of an oil well.
Background
For low-permeability and low-yield oil reservoirs, even if part of wells are selected to be used in the current oil production equipment with the lowest capacity and the smallest pumping parameter, the liquid supply capacity of the oil wells is still smaller than the discharge capacity of the equipment, and at the moment, in order to save energy and reduce consumption, an intermittent pumping production mode is usually adopted for the oil wells. The concept of fine management, cost reduction and efficiency improvement of the oil well is embodied by the intermittent extraction oil, whether the intermittent extraction oil is adopted is not directly related to the oil price, but the energy-saving advantage of the extraction during the period of low oil price is more prominent.
At present, the oil well adopting intermittent pumping measures on an oil extraction site usually measures the working fluid level of the oil well irregularly and observes the recovery degree of the working fluid level so as to determine the intermittent pumping period. The method is unscientific in determining the time interval between the starting and stopping of the pumping well and cannot change along with the change of the working condition of the pumping well, meanwhile, the current dynamic liquid level testing technology has larger precision error and cannot accurately reflect the well closing recovery condition of the pumping well, the requirement on the responsibility of post workers is higher during testing, the labor intensity is higher, and certain potential safety hazard also exists during testing. Although the working fluid level continuous monitor exists at present, the monitor needs to be installed and fixed on the wellhead of an oil well to be tested during testing, and the cost is high due to the fact that one well is used for one instrument.
The invention provides a method for determining an oil well spacing system by theoretical calculation, which can determine the oil well spacing system by trial calculation according to the existing oil well test data and production data.
Disclosure of Invention
The invention aims to provide a method for determining the pumping time between oil wells, so as to avoid potential safety hazards in testing and reduce the labor intensity of staff and the testing cost.
The invention aims to realize the technical means that the method for determining the pumping time between oil wells is characterized by comprising the following steps,
first step, the dynamic liquid level depth H when the balance is restored sb And the working fluid level depth H at production equilibrium Lb Measuring, firstly, closing the well and recovering, wherein the well head liquid production is 0, but the stratum liquid production is not 0, but the stratum liquid production is gradually reduced along with the increase of the bottom hole pressure until the stratum liquid production is 0, and measuring the well head liquid production and the stratum liquid productionThe depth of the working fluid level is the depth H of the working fluid level when the balance is restored sb (ii) a Then the well is opened for production until the stratum liquid production capacity is consistent with the well head liquid production capacity, the working fluid level depth at the moment is measured, namely the working fluid level depth H during production balance Lb ；
Secondly, determining the recovery time of stopping the well,
given an initial shut-in recovery time t s And error parameter epsilon is calculated to obtain the depth h of the recovered working fluid level corresponding to the time s If h is satisfied s -H sb If epsilon is less, the well shut-in recovery time is t s ；
Thirdly, determining the well-opening production time,
initial given well opening time t L Calculating to obtain the well opening t L Corresponding to the working fluid level depth h after hour L Obtaining the amount of liquid produced Q and the average amount of liquid produced Q on the ground when the production is balanced u If satisfy H Lb -h L < ε, and Q u t L ＞＝Q(t L +t s ) Then the well production time can be determined as t L ；
The fourth step, the intermittent pumping work,
closing the well again and pumping unit t according to the closing of the well s Closing the well and recovering the well in the hour, starting the oil pumping unit t of the oil well L The intermittent pumping operation is repeated regularly when the well is opened for production in hours until the intermittent pumping period needs to be determined again.
Further, the working fluid level depth h is recovered s The calculation method comprises the steps of firstly obtaining a shaft storage coefficient C and recovering the working fluid level depth
Further, the dynamic liquid level H when the balance is restored sb The obtaining method can also comprise the steps of obtaining the depth H in the oil layer and the formation pressure P r And fluid production density D L Dynamic liquid level when restoring balance
Where g is the acceleration of gravity.
Go toStep (b), the working fluid level depth h L The calculation method of (2) is to obtain the oil volume coefficient B o And liquid production index J L And fluid production density D L Depth of working fluid level
Wherein g is the acceleration of gravity and C is the wellbore storage coefficient.
Furthermore, the method for acquiring the liquid production amount Q during the production balance comprises the following steps,
B o is the oil volume coefficient, J L Is index of fluid production, D L The density of the produced liquid and g is the acceleration of gravity.
Further, the average liquid production on the ground Q u The method comprises the steps of obtaining the annular flow area A of the oil sleeve and the production t L Bottom hole flow pressure P wf Formation pressure P r And fluid density D L Average amount of liquid produced on the ground
h L (t L ) To produce the dynamic liquid level depth, g is the acceleration of gravity.
Further, the production t L Time bottom hole flowing pressure P wf The calculation method comprises the steps of firstly obtaining the depth H in the oil layer and the bottom hole flowing pressure P wf ＝D L g(H-h L ) And g is the acceleration of gravity.
Further, in the second step, if h s -H sb If epsilon is not satisfied, delta t is taken as the step length to obtain the new shut-in recovery time t s1 And the depth h of the recovered working fluid level corresponding to the time s1 If h is s1 -H sb < ε, then t s1 Namely the well shut-in recovery time,
if h is still not satisfied s1 -H sb If the value is less than epsilon, then the delta t is taken as the step length, and the new well shut-in recovery time t is repeatedly obtained sn And the depth h of the recovered working fluid level corresponding to the time sn Up to h sn -H sb < ε, then t sn Namely the well shut-in recovery time.
Further, in the third step, if H is Lb -h L < ε, and Q u t L ＞＝Q(t L +t s ) If not, then t is used L Based on the step length of delta t, the new well opening time t is obtained L1 And the production working fluid level depth h corresponding to the time L1 If H is Lb -h L1 < epsilon while Q u t L1 ＞＝Q(t L1 +t s ) Then, consider t L1 Namely the well opening production time;
if H is still not satisfied Lb -h L1 < ε and Q u t L1 ＞＝Q(t L1 +t s ) Then, the delta t is taken as the step length to obtain the new well opening time t Ln And the production working fluid level depth h corresponding to the time Ln Up to H Lb -h Ln < epsilon while Q u t Ln ＞＝Q(t Ln +t s ) Then t is Ln I.e. the open-hole production time.
The invention has the beneficial effects that: 1. the intermittent pumping period of the oil well is obtained through the test data and the production data in the production process of the oil well, potential safety hazards possibly existing in the manual test are avoided, and the labor intensity and the test cost of workers are reduced.
Detailed Description
[ example 1 ] A method for producing a polycarbonate
A method for determining the pumping time between oil wells comprises the following steps:
first step, the working fluid level depth H when the balance is restored sb And the working fluid level depth H at production equilibrium Lb The measurement is carried out by measuring the temperature of the sample,
firstly, shutting down the well and recovering, wherein the well head liquid production is 0 at the moment, but the stratum liquid production is not 0, but the stratum liquid production is gradually reduced along with the increase of the bottom hole pressure until the stratum liquid production is 0, and measuring the depth of the dynamic liquid level at the moment, namely the dynamic liquid level depth H when the balance is recovered sb (ii) a Then, the well is opened for production until the stratum liquid production amount is consistent with the well mouth liquid production amount, and the depth of the working fluid level at the moment is measured, namely the depth H of the working fluid level when the production is balanced Lb ；
Secondly, determining the recovery time of stopping the well,
given an initial shut-in recovery time t s And error parameter epsilon, calculating to obtain the recovered working fluid level depth h corresponding to the time s If h is satisfied s -H sb If epsilon is less, the well shut-in recovery time is t s ；
If h is s -H sb If epsilon is not satisfied, delta t is taken as the step length to obtain the new shut-in recovery time t s1 And the depth h of the recovered working fluid level corresponding to the time s1 If h is s1 -H sb < ε, then t s1 Namely the well shut-in recovery time,
if h is still not satisfied s1 -H sb If epsilon is less than epsilon, then delta t is taken as the step length, and the new well shut-in recovery time t is obtained repeatedly sn And the recovery working fluid level depth h corresponding to the time sn Up to h sn -H sb < ε, then t sn Namely the well shut-in recovery time.
Thirdly, determining the production time of the well opening,
initial given well opening time t L Calculating to obtain the well opening t L Corresponding to the working fluid level depth h after hour L Obtaining the liquid production amount Q and the ground average liquid production amount Q when the production is balanced u If H is satisfied Lb -h L < ε, and Q u t L ＞＝Q(t L +t s ) Then the well production time can be determined as t L ；
If H Lb -h L < ε, and Q u t L ＞＝Q(t L +t s ) If not, then t is used L Based on the delta t as the step length, the new well opening time t is obtained L1 And the production working fluid level depth h corresponding to the time L1 If H is Lb -h L1 < epsilon while Q u t L1 ＞＝Q(t L1 +t s ) Then consider t L1 Namely the well opening production time;
if H is still not satisfied Lb -h L1 < ε and Q u t L1 ＞＝Q(t L1 +t s ) Then, the delta t is used as the step length to obtain the new well opening time t Ln And the generator corresponding to the timeDepth h of the liquid level of the produced fluid Ln Up to H Lb -h Ln < epsilon while Q u t Ln ＞＝Q(t Ln +t s ) Then t is Ln I.e. the open-hole production time.
The fourth step, the intermittent pumping work,
closing the well again and pumping unit t according to the closing of the well s Closing the well for recovery in the hour, starting the oil pumping unit t L The intermittent pumping operation is repeated regularly when the well is opened for production in hours until the intermittent pumping period needs to be determined again.
[ example 2 ] A method for producing a polycarbonate
The depth h of the recovered working fluid level s The calculation method comprises the steps of firstly obtaining a shaft storage coefficient C and recovering the working fluid level depth
The dynamic liquid level H when the balance is restored sb The obtaining method can also be that the depth H in the oil layer and the stratum pressure P are obtained r And fluid density D L Dynamic liquid level when restoring balance
Where g is the acceleration of gravity.
The depth h of the working fluid level L The calculation method comprises obtaining the oil volume coefficient B o And liquid production index J L And fluid density D L Depth of working fluid level
Wherein g is the acceleration of gravity and C is the wellbore storage coefficient. Wherein, when not pumping, the liquid production amount Q when the production is balanced and the average liquid production amount Q on the ground u Equal, so the formula can be equivalent to when not decimated
The method for obtaining the liquid production amount Q during production balance comprises the following steps,
B o is the oil volume coefficient, J L Is index of fluid production, D L The density of the produced liquid and g is the gravity acceleration.
The average liquid production on the ground Q u The method comprises the steps of obtaining the annular flow area A of the oil sleeve and the production t L Bottom hole flow pressure P wf Formation pressure P r And fluid density D L Average amount of liquid produced on the ground
h L (t L ) To produce the dynamic liquid level depth, g is the acceleration of gravity.
Production of t L Bottom hole flowing pressure P wf The calculation method comprises the steps of firstly obtaining the depth H in the oil layer and the bottom hole flowing pressure P wf ＝D L g(H-h L ) And g is the acceleration of gravity.
In the second step, if h s -H sb If epsilon is not satisfied, delta t is taken as the step length to obtain the new shut-in recovery time t s1 And the recovery working fluid level depth h corresponding to the time s1 If h is s1 -H sb < ε, then t s1 Namely the well shut-in recovery time,
if h is still not satisfied s1 -H sb If the value is less than epsilon, then the delta t is taken as the step length, and the new well shut-in recovery time t is repeatedly obtained sn And the recovery working fluid level depth h corresponding to the time sn Up to h sn -H sb < ε, then t sn Namely the well shut-in recovery time.
In the third step, if H Lb -h L < ε, and Q u t L ＞＝Q(t L +t s ) If not, t is used L Based on the step length of delta t, the new well opening time t is obtained L1 And the production working fluid level depth h corresponding to the time L1 If H is Lb -h L1 < epsilon while Q u t L1 ＞＝Q(t L1 +t s ) Then, consider t L1 Namely the well opening production time;
if H is still not satisfied Lb -h L1 < ε and Q u t L1 ＞＝Q(t L1 +t s ) Then, the delta t is taken as the step length to obtain the new well opening time t Ln And the production working fluid level depth h corresponding to the time Ln Up to H Lb -h Ln < epsilon while Q u t Ln ＞＝Q(t Ln +t s ) Then t is Ln I.e. the open-hole production time.
[ example 3 ]
Pressure P of stratum of well in certain oil field area r 11.59MPa, depth in oil layer H1563 m, fluid production index J L 0.12m3/(d.MPa), density of collected liquid D L 0.94g/cm3, working fluid level depth H at production equilibrium Lb 1456.5m, inner diameter of sleeve R6.625in, outer diameter of oil pipe r2.875in, and volume coefficient B o 1.26。
Time t of stopping well s Determination of (1):
restoring the equilibrium dynamic liquid level depth based on the known data
Coefficient of storage
The oil jacket annular space overflowing area A = pi (R) 2 -r 2 )
Set well shut-in recovery time t s The corresponding working fluid level recovery depth h is 48 hours s Is composed of
Comparison h s And H sb Size, ε = h s -H sb ＝369.5-304.9＝64.6m
According to the actual condition of the oil field, ifh s -H sb If the epsilon does not meet the requirement, the well is stopped and recovered continuously, and the process is circulated until h is met s -H sb Up to ∈, a determined time t s Namely the shut-in recovery time. Where epsilon may be given based on the formation permeability rate at the actual site.
This example considers that the shut-in recovery 48h may satisfy the condition, which may not be the case, but does not affect the rationality of the analysis process.
Determination of well-opening production time
Setting the well opening time t L The time is 16 hours or more,
the well opening time is gradually adjusted according to the condition that the liquid production quantity after production does not fall, and the liquid production quantity Q is equal to
At this time, the production liquid level is h L Then, then
At this time, no thinning is performed, Q is in the original formula u The equivalence is Q.
Comparison H Lb And h L Size, ε = H Lb -h L And the =1456.5-1015.3=441.2m, and the example considers that the epsilon meets the condition, possibly does not conform to the actual situation, but does not influence the rationality of the analysis process.
The average liquid production on the ground is Q when the production time is 16h u Bottom hole flowing pressure of P wf1 Then, then
P wf1 ＝D L g(H-h L )＝0.94×10 3 ×9.8×(1563-1015.3)×10 -6 ＝5.05MPa
Comparison Q u t L And Q (t) L +t s ) I.e. by
Q u t L ＝19.23×16/24＝12.8m 3 /d
Q(t L +t s )＝1.01×(16+48)/24＝2.7m 3 /d
Due to Q u t L ＞Q(t L +t s ). Therefore, the well can adopt intermittent pumping production, and the well opening time is 16 hours.
Therefore, the inter-well opening period can be determined as 16 hours for opening the well and 48 hours for stopping the well.
And in the subsequent oil well work, the pumping unit is started for 16 hours to pump oil, stops working after 16 hours, and opens the well again for 16 hours after the well closing recovery of the oil well is finished, such as stopping working for 48 hours. Intermittent pumping is carried out according to the period of 16 hours of well opening and 48 hours of well stopping until the intermittent pumping period needs to be measured again.
Claims (9)
1. A method for determining the pumping time between oil wells is characterized by comprising the following steps:
first step, the working fluid level depth H when the balance is restored sb And the working fluid level depth H at production equilibrium Lb The measurement is carried out by measuring the temperature of the sample,
firstly, shutting down the well and recovering, wherein the well head liquid production is 0 at the moment, but the stratum liquid production is not 0, but the stratum liquid production is gradually reduced along with the increase of the bottom hole pressure until the stratum liquid production is 0, and measuring the depth of the dynamic liquid level at the moment, namely the dynamic liquid level depth H when the balance is recovered sb (ii) a Then the well is opened for production until the stratum liquid production capacity is consistent with the well head liquid production capacity, the working fluid level depth at the moment is measured, namely the working fluid level depth H during production balance Lb ；
Secondly, determining the recovery time of stopping the well,
given an initial shut-in recovery time t s And error parameter epsilon is calculated to obtain the depth h of the recovered working fluid level corresponding to the time s If h is satisfied s -H sb If epsilon is less, the well shut-in recovery time is t s ；
Thirdly, determining the well-opening production time,
initial given well opening time t L Calculating to obtain the well opening t L Corresponding to the working fluid level depth h after hour L Obtaining the amount of liquid produced Q and the average amount of liquid produced Q on the ground when the production is balanced u If H is satisfied Lb -h L < ε, and Q u t L ＞＝Q(t L +t s ) Then the well production time can be determined as t L ；
The fourth step, the intermittent pumping work,
closing the well again and pumping unit t according to the closing of the well s Closing the well for recovery in the hour, starting the oil pumping unit t L The intermittent pumping operation is repeated regularly when the well is opened for production in hours until the intermittent pumping period needs to be determined again.
2. The method of claim 1 for determining interwell pumping time, wherein: the depth h of the restored dynamic liquid level s The calculation method comprises the steps of firstly obtaining a shaft storage coefficient C and recovering the working fluid level depth
3. A method of determining interwell pumping time according to claim 1 or 2, characterized in that: the dynamic liquid level H when the balance is restored sb The obtaining method can also comprise the steps of obtaining the depth H in the oil layer and the formation pressure P r And fluid production density D L Dynamic liquid level when restoring balance
Where g is the acceleration of gravity.
4. The method of claim 1 for determining interwell pumping time, wherein: the depth h of the working fluid level L The calculation method comprises obtaining the oil volume coefficient B o And liquid production index J L And fluid density D L Depth of working fluid level
Wherein g is the gravitational acceleration and C is the wellbore storage coefficient.
5. The method of claim 1 for determining interwell pumping time, wherein: the method for obtaining the liquid production amount Q during production balance comprises the following steps,
B o is the oil volume coefficient, J L Is the index of fluid production, D L The density of the produced liquid and g is the gravity acceleration.
6. The method of claim 1 for determining interwell pumping time, wherein: the average liquid production on the ground Q u The method comprises the steps of obtaining the annular flow area A of the oil sleeve and the production t L Bottom hole flow pressure P wf Formation pressure P r And fluid production density D L Average amount of liquid produced on the ground
h L (t L ) To produce the dynamic liquid level depth, g is the acceleration of gravity.
7. The method of claim 6, wherein the step of determining the pumping time comprises: production of t L Time bottom hole flowing pressure P wf The calculation method comprises the steps of firstly obtaining the depth H in the oil layer and the bottom hole flowing pressure P wf ＝D L g(H-h L ) And g is the gravitational acceleration.
8. The method of claim 1 for determining interwell pumping time, wherein: in the second step, if h s -H sb If epsilon is less than epsilon, delta t is taken as the step length to obtain the new well shut-in recovery time t s1 And the recovery working fluid level depth h corresponding to the time s1 If h is s1 -H sb < ε, then t s1 Namely the well shut-in recovery time,
if still not satisfiedh s1 -H sb If epsilon is less than epsilon, then delta t is taken as the step length, and the new well shut-in recovery time t is obtained repeatedly sn And the depth h of the recovered working fluid level corresponding to the time sn Up to h sn -H sb < ε, then t sn Namely the well shut-in recovery time.
9. The method of claim 1 for determining interwell pumping time, wherein: in the third step, if H Lb -h L < epsilon, and Q u t L ＞＝Q(t L +t s ) If not, t is used L Based on the delta t as the step length, the new well opening time t is obtained L1 And the production working fluid level depth h corresponding to the time L1 If H is Lb -h L1 < epsilon while Q u t L1 ＞＝Q(t L1 +t s ) Then, consider t L1 Namely the well opening production time;
if H is still not satisfied Lb -h L1 < epsilon and Q u t L1 ＞＝Q(t L1 +t s ) Then, the delta t is taken as the step length to obtain the new well opening time t Ln And the production working fluid level depth h corresponding to the time Ln Up to H Lb -h Ln < epsilon while Q u t Ln ＞＝Q(t Ln +t s ) Then t is Ln I.e. the open-hole production time.
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