Method for improving condensate oil recovery ratio through injecting water into fracture-cave type carbonate condensate gas reservoir
A technology for condensate gas reservoirs and carbonate rocks, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc. It can solve problems such as difficulty in determining the connection relationship, large well spacing, and difficulty in carrying out cyclic gas injection, etc. To achieve the effect of enhanced recovery
Inactive Publication Date: 2015-10-28
塔里木油田分公司勘探开发研究院 +1
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However, for fractured-vuggy carbonate condensate gas reservoirs with medium to high condensate oil content, since the storage space is mainly pores, caves, and fractures formed by dissolution, the heterogeneity is extremely strong, and the connection structure and connection mode of the reservoir body Complex and diverse, the early well spacing is large, and the connection relationship is difficult to determine, which makes it difficult to carry out cyclic gas injection. Therefore, at present, depletion development is mostly used. The formation pressure drops in the middle and late stages of development, and reverse condensate appears in the formation, so there must be a large amount of condensate oil How to further improve the condensate oil recovery of this type of gas reservoir under the premise of satisfying economic benefits is the main problem faced in the later stage of depletion development of fractured-vuggy condensate gas reservoirs, and there is still a lack of effective recovery methods
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[0020] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0021] A method for enhancing the recovery of condensate oil by water injection in a fractured-cavity carbonate condensate gas reservoir, comprising the following steps:
[0022] 1) Reservoir type identification: The seismic profile shows “strong beading”, and during drilling, venting and leakage occur, and the oil pressure decreases exponentially during the test production period, showing the characteristics of relative constant volume, with a large decrease, and the well test explains the well-reservoir coefficient If the value is large and the kh value is large, it can be judged as a fracture-cavity reservoir;
[0023] 2) Determination of reverse condensate and oil ring: According to PVT test, the production gas-oil ratio and the density change of produced condensate can determine the occurrence of reverse condensate; calculate the relevant parame...
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The invention provides a method for improving the condensate oil recovery ratio through injecting water into a fracture-cave type carbonate condensate gas reservoir. The method comprises the following steps of: (1) reservoir type identification; (2) retrograde condensation and oil ring judgment; (3) study on the underground occurrence state of retrograde condensation oil; (4) indoor physical experiment analysis and study; (5) trial injection; (6) water injection; (7) well soaking; and (8) oil production. The method has the advantages that the technical storage and the favorable support are provided for the recovery ratio improvement through water injection development of the fracture-cave type carbonate condensate gas reservoir, and the recovery ratio is greatly improved.
Description
technical field [0001] The invention relates to an oil and gas development method, in particular to a condensate oil recovery method for fracture-cave carbonate condensate gas reservoirs. Background technique [0002] The field development practice of condensate gas reservoirs shows that low condensate oil condensate gas reservoirs can be developed in depletion mode, and the circulation gas injection technology is the main technology for developing medium and high condensate oil condensate gas reservoirs. However, for fractured-vuggy carbonate condensate gas reservoirs with medium to high condensate oil content, since the storage space is mainly pores, caves, and fractures formed by dissolution, the heterogeneity is extremely strong, and the connection structure and connection mode of the reservoir body Complex and diverse, the early well spacing is large, and the connection relationship is difficult to determine, which makes it difficult to carry out cyclic gas injection. T...
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IPC IPC(8): E21B43/16E21B49/00
Inventor 邓兴梁蔡振忠李世银刘志良周登洪范崇海李颖沈磊
Owner 塔里木油田分公司勘探开发研究院
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