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Non-crack type water breakthrough oil well repeated transformation method

A technology for repeated reconstruction and oil wells, which is applied in the direction of earthwork drilling, wellbore/well components, and production fluids, etc. It can solve problems such as difficulty in guaranteeing effect and validity period, complicated construction procedures, and high construction risks, and achieves low construction risks and improved fractures. The degree of complexity and the effect of simple and easy process

Inactive Publication Date: 2019-12-10
PETROCHINA CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a non-fracture-type water breakthrough oil well repeated reconstruction method to solve the problem that the effect and validity period of water control technical measures such as changing phase permeability fracturing fluid are difficult to guarantee, and the "multi-slug gel + consolidation type plugging The problems of complex construction procedures, high construction risks and long operation period of water plugging and fracturing technology in the original layer

Method used

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  • Non-crack type water breakthrough oil well repeated transformation method

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Effect test

Embodiment 1

[0032] In order to solve the problems that the effect and validity period of the existing water control technical measures are difficult to guarantee, the construction process of the "multi-slug gel + consolidation type plugging agent" water plugging and fracturing technology is complicated, the construction risk is high, and the operation period is long. This embodiment provides a non-fractured water breakthrough oil well repeated reconstruction method, including the following steps:

[0033] Step 1) inject temporary plugging agent;

[0034] Step 2) Inject guar gum base solution;

[0035] Step 3) Stop the pump and release the spray;

[0036] Step 4) Inject the cross-linked gel water blocking agent;

[0037] Step 5) Carry 40-70 mesh and 70-100 mesh consolidation sand into the cracks successively with guar gum cross-linking fluid;

[0038] Step 6) closing the well and waiting for solidification;

[0039] Step 7) Carry out temporary plugging and diversion to fracturing const...

Embodiment 2

[0042] This embodiment provides a non-fractured water breakthrough oil well repeated reconstruction method, including the following steps:

[0043] Step 1) Use the guar gum base fluid to carry the temporary plugging agent into the primary fracture, and form a bridge plug in the fracture, restricting the subsequent injection of liquid into the high-permeability section;

[0044] The role of the temporary plugging agent realizes flow restriction and prevents fluid loss in the effluent high-permeability channel before the cross-linked gel water blocking agent.

[0045] Step 2) Inject guar gum base liquid, and quickly form a filter cake on the wall of the crack in the front section of the bridge plug to ensure that the later cross-linked gel water blocking agent will not enter the low-pressure reservoir around the crack, so that it can directly enter the high-permeability of the effluent layers;

[0046] Step 3) Stop the pump, use the tubing to spray, use the reverse force of the...

Embodiment 3

[0057] This embodiment provides a non-fractured water breakthrough oil well repeated reconstruction method, including the following steps:

[0058] Step 1) inject temporary plugging agent;

[0059] Step 2) Inject guar gum base solution;

[0060] Step 3) Stop the pump and release the spray;

[0061] Step 4) Inject the cross-linked gel water blocking agent;

[0062] Step 5) Carry 40-70 mesh and 70-100 mesh consolidation sand into the cracks successively with guar gum cross-linking fluid;

[0063] Step 6) closing the well and waiting for solidification;

[0064] Step 7) Carry out temporary plugging and diversion to fracturing construction.

[0065] Step 1) The injected temporary plugging agent is a solid temporary plugging agent, and its dosage is 100-200kg.

[0066] Step 2) The injection volume of guar base liquid is 10-20 m 3 , construction displacement is 1.0-2.0m 3 / min.

[0067] Step 3) The discharge volume is 3-5 m 3 .

[0068] Step 4) The cross-linked gel water b...

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Abstract

The invention provides a non-crack type water breakthrough oil well repeated transformation method. The method is a novel technology integrating a water controlling and plugging technology, a seam endtemporary plugging, diverting and fracturing technology and the like, the emphasis is put on designing and optimizing of the water controlling and plugging process, a multi-section water plugging process combining temporary plugging plus cross-linked gel water plugging agents and multi-specification consolidation sand is adopted for plugging a water breakthrough hyperpermeable layer section matrix pore throat, a micro-crack and an artificial crack deep part, so that the purpose of water controlling and lowering is achieved; meanwhile, through temporary plugging and fracturing, the crack transformation size is increased, the crack complexity is improved, residual oil of a water-breakthrough-free layer is used, and the purpose of improving productivity per well is achieved; and the method is high in operability during a construction course, low in construction risk and short in construction period, and solves the problem of high-efficiency production of an extra-low-permeability oil reservoir pore type water-breakthrough and pore-crack-type water-breakthrough oil well in the same layer.

Description

technical field [0001] The invention belongs to the technical field of downhole operations in oilfield exploration and development, and in particular relates to a non-fracture-type water breakthrough oil well repeated transformation method, which is suitable for pore-type water breakthrough in ultra-low permeability reservoirs in the middle and late stages of development, or where water cut may rise after repeated transformation measures oil well. Background technique [0002] The development mode of ultra-low permeability reservoirs in Changqing Oilfield is mainly based on waterflooding. With the progress of development, some reservoirs have entered the middle and late stages of development. Affected by factors such as strong reservoir heterogeneity and natural fractures, the planar The distribution of remaining oil is complicated. The oil wells show different degrees of water cut rise, and the number of medium-high water cut oil wells increases year by year. The main types...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/13
CPCE21B33/13E21B43/26
Inventor 卜军李向平吕宝强达引朋王飞杨军侠汪澜吴甫让李转红康博
Owner PETROCHINA CO LTD
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