Gas East Low Reservoir Damage In A Transformation Technology Test And Research

Sulige gas field in Eastern reservoir low damage fiacturing technology is the object of study, carried out a series of tests related to the fiacturing of reservoir physical properties on the basis of systematic analysis of the geological characteristics of the Sulige gas field in Eastern reservoir. the study of rock mechanics experiments, temperature fiacturing system determination, stress analysis and stress orientation in test, stress-sensitive experiments; consider the Eastern reservoir reconstruction mainly to reduce formation damage were the carboxymethyl low damage fiacturing fluid system, and preferably carboxymethyl fiacturing fluid additive formulations and the fracturing fluid formulations for the Eastern District of Sulige gas field, in the pre-test and constantly improve the fiacturing fluid formulations; study tie in with the low damage fracturing fluid system of multi-layer low permeability gas reservoir fiacturing optimization design techniques; field application carboxymethyl low damage fiacturing fluid system for a10well test.Through research, the research results of the following aspects:1, the establishment of a set of static and dynamic multi-layer low permeability gas reservoir before the transformation, a combination of macro and micro data reservoir assessment methods;2, the initial formation of the multi-layer low permeability gas reservoir fracturing optimization design method, the vertical extension of the law to determine the hierarchical fiacturing, reasonable size, displacement, and propose targeted vertical support section control technology, through hierarchical control to determine the partial pressure and construction scale, research hierarchical crack propagation and change of the temperature field, to determine1he layered gel breaking control technology to ensure a reasonable profile of the layers support;, to improve the low permeability gas reservoir the carboxymethyl low damage fiacturing fluid system through the fracturing fluid adhesive residue and residues injury research, draw the main damage of the fracturing fluid conductivity and the residual gum damage, proved by scanning electron microscopy and experimental the carboxymethyl system low concentration of thickening agent, and has completely broken plastic, adhesive residue with a lower amount cracks and reservoir damage is very low, to form a single well design, site implementetion and assessment techniques, pressure after the wells were single well fiacturing design and guide the on-site construction, construction and the amount of sand and Design in line with the average rate of93%of the net pressure, the pressure after the construction fitting that the fracture parameters to meet the design target, seamless out of control, some wells crack filling than full;5, field application of a number of processes achieved a breakthrough, achieved significant yield field test10wells of25storeys. Open flow of test gas Bisulige Eastern average3～4×104m3/d higher, and increase yield. Sulige gas field the outcome of this study can be used to the Eastern reservoir reconstruction to provide theoretical guidance for the single well fracturing of great significance to achieving efficient development of the Sulige gas field in Eastern, but also provide a reference for similar gas reservoirs transformation...