Mining method suitable for low-permeability conglomerate oil reservoir

A production method and technology for oil reservoir production, which are applied in the fields of production fluids, chemical instruments and methods, and earth-moving drilling, etc., can solve the problems that the recovery factor needs to be improved and the injection pressure is high, so as to improve the oil recovery factor and reduce the injection pressure. The effect of pressure, good construction performance

Pending Publication Date: 2021-06-11
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a mining method suitable for low-permeability conglomerate reservoirs, so as to solve the problem of high injection pressure and low The recovery rate needs to be improved, etc.

Method used

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  • Mining method suitable for low-permeability conglomerate oil reservoir
  • Mining method suitable for low-permeability conglomerate oil reservoir

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Experimental program
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Effect test

Embodiment 1

[0029] A reservoir production method suitable for low-permeability conglomerate reservoirs, comprising:

[0030] (1) Use water to prepare a partially hydrolyzed polyacrylamide polymer solution with a molecular weight of 3.42 million and a concentration of 500 mg / L (the polyacrylamide polymer is Beijing Hengju Co., Ltd., model KY-1SM, molecular weight 3.42 million).

[0031] (2) Adopt oilfield produced water to directly prepare surfactant solution, the surfactant of concentration 1000mg / L is anionic surfactant and is naphthenic petroleum sulfonate (Karamay City Jinta Co., Ltd., model KPS, molar molecular mass is 420g / mol).

[0032] (3) Inject the polyacrylamide polymer solution in step (1) into the oil reservoir at an injection rate of 0.08PV / a, and the injection volume is 0.1PV.

[0033](4) After step (3) injects 0.02PV, alternately inject the surfactant solution in step (2) and the polymer solution in step (1), the alternating sequence is surfactant solution-polymer solution...

Embodiment 2

[0035] The difference from Example 1 is that the surfactant is heavy alkylbenzene sulfonate (sodium heavy alkylbenzene sulfonate is Daqing Donghao Investment Co., Ltd., model DPS, molar molecular mass is 600g / mol).

Embodiment 3

[0037] The difference from Example 1 is that the surfactant is fatty alcohol polyoxyethylene ether (lauryl alcohol).

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Abstract

The invention provides a mining method suitable for a low-permeability conglomerate oil reservoir. The mining method suitable for the low-permeability conglomerate oil reservoir comprises the steps that a polyacrylamide aqueous solution is prepared, and the molecular weight of polyacrylamide is 3-7 million; a surfactant aqueous solution is prepared, the surfactant aqueous solution comprises 1000-1800mg / L of petroleum sulfonate surfactants, and the molar mass of the petroleum sulfonate surfactants is 300-650g / mol; and the polyacrylamide aqueous solution and the surfactant aqueous solution are alternately injected into a target oil reservoir mining point. By adopting the mining method, the injection pressure and viscosity of an oil displacement system can be reduced, and the construction convenience and oil reservoir recovery efficiency of the oil displacement system are improved.

Description

technical field [0001] The invention relates to the field of oil reservoir mining, in particular to a mining method suitable for low-permeability conglomerate oil reservoirs. Background technique [0002] Conglomerate reservoirs in Xinjiang are deposited with mixed particle sizes of clastic particles, the reservoir pore structure is very complex, and the reservoir heterogeneity is extremely strong. Compared with sandstone reservoirs with similar physical properties, the water cut of conglomerate reservoirs increases rapidly, and the recovery rate of waterflooding is low. The average permeability of the low-permeability conglomerate reservoir is 59.4mD, and the effective permeability is 17mD. It has the problems of high injection pressure (from 8.9MPa at the beginning of water flooding to 13.7MPa) and rapid rise of water cut and low recovery during water injection. , which brings difficulties to the effective development of oilfields. How to further increase oil recovery wh...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/584C09K8/588
CPCE21B43/16C09K8/584C09K8/588
Inventor 关丹栾和鑫白雷阙庭丽徐崇军帕提古丽·麦麦提李凯姜炳祥云庆庆唐文洁胡晓云
Owner PETROCHINA CO LTD
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