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Method for layer changing in layered exploitation of toothbrush-shaped oil reservoir

A technology of layered production and oil-like production, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., which can solve the problem of inability to fully utilize the productivity of upper and lower oil layers, large pressure differences between oil wells, and prominent interlayer interference contradictions, etc. question

Active Publication Date: 2015-07-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Toothbrush-shaped reservoirs are characterized by narrow stripes on the plane, multiple sets of oil-bearing formations in the vertical direction, and no uniform oil-water interface. Oil wells in toothbrush-shaped reservoirs have large interlayer pressure differences and prominent interlayer interference contradictions. And the shortcomings of not being able to fully utilize the production capacity of the upper and lower oil layers
In order to meet the production requirements, the measure of sealing up and returning is often adopted, but the sealed oil layer cannot be exploited, which will cause a waste of resources
[0003] Developed in recent years, the use of pump-down-hands-off separate mining strings for split-layer mining has solved the above problems. However, when using split-layer mining strings for layer-changing mining, it is often not well realized, and can only be used for Oil wells need to be re-operated to complete, wasting a lot of manpower and material resources

Method used

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  • Method for layer changing in layered exploitation of toothbrush-shaped oil reservoir
  • Method for layer changing in layered exploitation of toothbrush-shaped oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The embodiment of the present invention provides a toothbrush-shaped oil reservoir layered mining method for changing layers, see figure 1 , the method includes:

[0042] Step 101: Connect the outlet of the plunger pump on the 400-type pump truck to the first casing valve. The first casing valve is the casing valve on the large cross of the oil well Christmas tree that is not connected to the oil casing and is equipped with a monk head. .

[0043]Step 102: Open the valve of the first casing, and perform backwashing in the normal working state of the oil well. After the well washing is completed, let the oil well continue to work normally for a period of time, and stop the donkey head of the pumping unit at the bottom dead center to stop the oil well Work.

[0044] Step 103: Use the 400-type pump truck to pressurize and vent the oil casing annulus of the oil well several times. After the last pressurization and before venting, observe whether the pressure on the pressu...

Embodiment 2

[0049] The embodiment of the present invention provides a toothbrush-shaped oil reservoir layered mining method for changing layers, see figure 2 , the method includes:

[0050] Step 201: Close the two casing valves on the big cross of the oil well Christmas tree. Among the two casing valves, the casing valve that is not connected to the oil casing and is equipped with a monk head is the first casing valve. Remove the first casing The monk head on the valve connects the outlet of the plunger pump on the 400 pump truck with the first casing valve.

[0051] Wherein, the oil jacket is a pipeline between another casing valve of the two casing valves and the oil pipe valve.

[0052] Step 202: Open the valve of the first casing, and carry out backwashing under the normal working condition of the oil well. After the well washing is completed, let the oil well continue to work normally for a period of time, and stop the donkey head of the pumping unit at the bottom dead center to st...

Embodiment 3

[0072] The embodiment of the present invention provides a method for layer-by-layer mining and changing layers of a toothbrush-shaped oil reservoir. The separate mining string is 2100m, and the layer-by-layer mining and layer-changing construction shall be carried out according to the following steps:

[0073] (1) Close the two casing valves on the large cross of the X19-1 oil well X-mas tree, remove the monk head at one end of the casing valve that is not connected to the oil casing and is equipped with a monk head, and remove the casing behind the monk head The valve is connected to the outlet of the plunger pump on the 400-type pump truck;

[0074] (2) Open the casing valve at the end connected to the outlet of the plunger pump on the 400-type pump truck. Under the normal working condition of the X19-1 oil well, adopt the backwashing method of entering from the casing annulus and returning from the tubing , with a displacement of 10m 3 / h, 35m of clear water or oilfield s...

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Abstract

The invention discloses a method for layer changing in layered exploitation of a toothbrush-shaped oil reservoir and belongs to the field of petroleum industry petroleum exploitation engineering. The method includes the steps that an outlet of a plunger pump on a 400-type pump truck is connected with a first sleeve valve, which is not communicated with an oil sleeve and provided with a knuckle, on a spool of a Christmas tree; the first sleeve valve is opened for inverse well flushing, and stops an oil well from working; the 400-type pump truck is used for performing repeated pressurizing and emptying from an oil sleeve annulus of the oil well; when decrease of pressure before the last time of pressurizing and emptying does not exceed a preset value within preset time, the displacement higher than that when repeated pressurizing is performed is adopted after emptying for performing repeated pressurizing and emptying again from the oil sleeve annulus, the pressure of a pressure gauge is observed after the last time of pressurizing, and when the pressure decreases to 0 MPa immediately, layer changing in layered exploitation is successful. Through the pressure transfer method, layer changing construction of pipe columns in layered exploitation is achieved, and for more than 50 times of layer changing exploitation of more than 10 oil wells, the success rate of on-site application reaches 100%.

Description

technical field [0001] The invention relates to the field of oil production engineering in the petroleum industry, in particular to a method for layer-by-layer production and replacement of toothbrush-shaped oil reservoirs. Background technique [0002] Toothbrush-shaped reservoirs are characterized by narrow stripes on the plane, multiple sets of oil-bearing formations in the vertical direction, and no uniform oil-water interface. Oil wells in toothbrush-shaped reservoirs have large interlayer pressure differences and prominent interlayer interference contradictions. And can not give full play to the shortcoming of upper and lower reservoir production capacity. In order to meet the production requirements, the measure of sealing up and returning is often adopted, but the sealed oil layer cannot be exploited, which will cause a waste of resources. [0003] Developed in recent years, the use of pump-down-hands-off separate mining strings for split-layer mining has solved the...

Claims

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Application Information

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IPC IPC(8): E21B43/14
CPCE21B43/14
Inventor 付亚荣严建奇刘春平马永忠张志明李小永李云靳利姜一超姚庆童李冬青付丽霞付茜王淑珍田惠萍
Owner PETROCHINA CO LTD