Fire flooding producing well layering gas channeling plugging technology

A technology for producing wells and gas channeling, which is applied in the directions of sealing/isolation, wellbore/well components, and production fluids, etc. It can solve the problems of unsatisfactory sealing effect, complicated construction procedures, and long construction time.

Active Publication Date: 2020-10-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims at the problems existing in the layered plugging regulation of fire-driven production wells in the past, and provides a layered gas channeling plugging technology for fire-driven production wells. The technology and the used pipe string solve the unsatisfactory plugging effect of the original technology , complex construction procedures, long construction time, high operating costs, etc., can effectively reduce operating procedures and costs, improve the effect of measures and production time rate

Method used

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  • Fire flooding producing well layering gas channeling plugging technology
  • Fire flooding producing well layering gas channeling plugging technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] This embodiment provides an expandable small-diameter K344 packer, and its structure diagram is as follows figure 1 Shown from figure 1 It can be seen that the expandable small diameter K344 packer includes:

[0090] Upper joint 1, upper connecting sleeve 2, central tube 3, upper outer shield 4, sealing rubber cylinder 5, first stop ring 6, second stop ring 13, lower outer shield 7, first rubber ring 12, The second rubber ring 8, the first valve cover, the second valve cover 9, the lower connecting sleeve 10, the lower joint 11, the third rubber ring 14, the fourth rubber ring 15;

[0091] The upper joint 1 is connected with the upper external thread of the center tube 3 through its lower internal thread; the upper joint 1 is connected with the internal thread of the upper connecting sleeve 2 through its lower external thread; the upper outer shield 4 is connected with the external thread of the upper connecting sleeve 2 through the internal thread of the upper end;

[0092] ...

Embodiment 2

[0109] This embodiment provides a stratified gas channeling plugging pipe string for a fire drive production well. figure 2 Shown from figure 2 It can be seen that the stratified gas channeling plugging string of the fire drive production well includes:

[0110] Pressure relief valve 16, throttle valve 17, the expandable small-diameter K344 packer 18 and check valve 19 provided in Example 1;

[0111] The pressure relief valve 16 and the throttle valve 17 are sequentially installed on the first oil pipe 20 from top to bottom;

[0112] The upper joint 1 of the expandable small diameter K344 packer 18 is connected to the first oil pipe 20 through its upper internal thread; the lower joint 11 of the expandable small diameter K344 packer 18 is connected to the second oil pipe through its lower internal thread The oil pipe 21 is connected;

[0113] The check valve 19 is connected to the bottom end of the second oil pipe 21 at the lower part of the expandable small-diameter K344 packer 1...

Embodiment 3

[0115] This embodiment provides a stratified gas channeling plugging process for fire-flooding production wells, wherein the stratified gas channeling plugging process for fire-flooding production wells utilizes the stratified gas channeling sealing process for fire-flooding production wells provided in Example 2. To plug the pipe string, the process includes the following steps:

[0116] The stratified gas channeling plugging string of the fire-flooded production well provided in Example 2 of the present invention is lowered to the designed position. After the wellhead is installed, the ground uses a cement truck to inject water into the tubing to suppress the pressure. Bottom, the oil jacket forms a pressure difference, and the sealant cylinder of the expandable small-diameter K344 packer expands to seal the annulus of the oil jacket against the casing wall to complete setting.

[0117] Inject a certain amount (200-300m) from the tubing into the oil layer 3 ), the gel composition...

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Abstract

The invention provides a fire flooding producing well layering gas channeling plugging technology. The fire flooding producing well layering gas channeling plugging technology comprises the steps that(1) after a fire flooding producing well layering gas channeling plugging pipe column is downwards arranged at a design position, a certain amount of gel composite is fed into an oil layer from an oil pipe; (2) a certain amount of high-strength gel particles are further fed from the oil pipe; and (3) an inorganic sealing agent channeling plugging system is injected, clear water is injected in a positive flow displacing manner, and then the clear water is displaced excessively. The fire flooding producing well layering gas channeling plugging technology and the adopted pipe column solve the problems that in the prior art, the plugging effect is not ideal, construction procedures are complicated, the construction time is long, and the operation cost is high; and operation procedures and cost can be effectively reduced, and the measure effect and the production efficiency are improved.

Description

Technical field [0001] The invention relates to a layered gas channeling plugging process for fire-flooding production wells, and belongs to the technical field of oil production engineering. Background technique [0002] With the continuous deepening of fire flooding development, due to the large inter-layer difference, uneven development of the plane and the uneven production of steam in the past, the uneven production of thick oil in the thin interbedded heavy oil development process has become prominent. Once the line of fire forms a one-way advance, it will have a serious impact on the entire fire drive well group. In order to increase the degree of production of low-permeability layers, prevent the one-way penetration of fire lines, and improve the overall development effect of fire-flooded wells, a field test of gas channeling plugging technology for fire-flooded production wells was carried out. With the implementation of this technology, many problems have been exposed....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/243C09K8/512C09K8/508
CPCE21B33/13E21B43/243C09K8/512C09K8/5083C09K2208/04
Inventor 郭洪军吴非罗恩勇许丹匡旭光向峥王岩王磊董鹏毅张志中史旭东
Owner PETROCHINA CO LTD
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