Well D1-559 in Daniudi Gas Field in North China achieved high production

China Petrochemical News Network August 16, the North China Oil & Gas Company 2021 Old Under the first development wells , wells Daniudi gas field D1-559 M51 4-7 layers acid fracturing high yield and stable gas production 3.
2651 ten thousand cubic meters , Test unblocked flow of 91,884 cubic meters per day
.

Well D1-559 is a development directional well deployed in the northeastern part of the Yishan Slope in the Ordos Basin.
The well uses a four-and-a-half inch slim hole cementing and completion.
Compared with a conventional five-inch and a half-casing completion, the drilling cycle is further shortened.
, The consumption of casing, drilling fluid and other materials and the output of cuttings are reduced by 35%-45%, and the effect of increasing speed and reducing costs is obvious
.

In view of the small vertical spacing of each fracturing section of the well target layer and poor barrier shielding effect, the design of the pre-fluid stage adopts the variable displacement controlled fracture high pressure fracturing process, and the main acid addition stage adopts alternating high-displacement and high-viscosity acids.
Injecting acid fracturing technology uses the difference in viscosity of the two acids to form a viscous finger, which increases the degree of uneven etching on the wall of acid-etched cracks and improves the conductivity of the cracks
.

At the same time, in order to reduce the peculiar smell of the flowback liquid after acid fracturing, the well is equipped with a skid-mounted peculiar smell removal device of nitrogen gas stripping + oxidation + liquid caustic soda neutralization.
The peculiar smell is effectively controlled during the gas test, which strongly supports the Daniu underground ancient times.
The production capacity of the gas reservoir is released
.

The high production of Well D1-559 represents the gradual maturity of the acid fracturing technology for alternating high and low viscosity acid injection in North China, which strengthens confidence in the efficient development of lower paleocarbonate gas reservoirs in the Daniudi Gas Field
.