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    Home > Chemicals Industry > Chemical Technology > Sand prevention can also increase oil - Shengli Oilfield layered chemical sand control technology application documentary

    Sand prevention can also increase oil - Shengli Oilfield layered chemical sand control technology application documentary

    • Last Update: 2022-11-25
    • Source: Internet
    • Author: User
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    Recently, the layered chemical sand prevention technology developed by the sand prevention center of Shengli Oilfield Petroleum Engineering Technology Research Institute became a hit in the Linpan oil production plant, doubling
    the oil increase.
    Some people ask: "Can sand control also increase oil?" In this regard, Xu Xia, a senior engineer at the center, explained: "First of all, the sand blocked the channel where the oil came out; Secondly, for gravel extrusion filling and sand prevention, the gravel forms a seepage channel in the near well area, which is equivalent to dredging the oil circuit
    .
    The results of the center's "research on layered chemical sand prevention technology in heterogeneous loose sandstone reservoirs" have implemented 107 wells in oil production plants such as Linpan and Lonely Island in Shengli Oilfield, with a cumulative oil increase of 15,000 tons and a reduction of about 50% in technical costs
    .

    Once like a chicken rib chemical sand repellent

    The cost of chemical sand prevention is low, half or even one-third of mechanical sand control, and there is no well pipe string, failure does not need to be overhauled, it should be "popular", in fact, it has indeed become the leading sand control technology
    for oilfield water injection wells, side drilling small wellbore wells, etc.
    There is just an embarrassing problem, the chemical sand control has a short validity period, and conventional wells basically fail in about a year, and even less than 200 days
    in multi-layer wells.
    For this reason, its application scale is much smaller than mechanical filling sand
    control.

    Studies have shown that, on the one hand, chemical sand fixing materials are the bottleneck; On the other hand, the uneven sand fixation of heterogeneous multi-layer wells is also an important reason
    for short validity period and low yield.
    Therefore, researchers have carried out more than 300 sets of compressive strength and more than 100 sets of permeability evaluation experiments on 5 kinds of sand fixing agents and 4 kinds of coating sand applied in Shengli Oilfield, and developed a low-viscosity active film emulsion sand fixing agent system, which doubled the original sand fixing strength and increased the permeability retention rate by more than
    120%.
    Among the similar sand fixing agent products at home and abroad, the product has obvious innovation advantages, which improves the high strength and high permeability uniform consolidation of the sand fixing agent at the bottom of the well
    .

    Layered sand-proof point stones into gold

    Years of field experience have shown that the general sand prevention of multi-layer wells is far from being able to solve the three prominent contradictions
    of plane, layer and layer.
    In the face of the new requirements of sand prevention in heterogeneous oil reservoirs of high argillaceous fine sandstone, in view of the problem of heterogeneity affecting consolidation uniformity between layers, researchers have carried out research on layered chemical sand prevention, and are committed to finding a new type of sand prevention technology
    that can solve the contradiction between layers, be efficient and stable, but also economical and simple.

    After repeated research experiments, the researchers put forward guiding opinions such as layered chemical sand prevention and sand fixing radius, layering basis, injection parameters, etc.
    , and innovatively developed layered chemical sand prevention filling pipe columns to form a safe filling pipe string without kava and multi-stage sand prevention card structure, which ensured differentiated sand fixation in heterogeneous multi-layer wells, and fundamentally solved the problems of
    chemical sand prevention sand out at one point and sand burial in the whole well.
    The new pipe string can realize 2~3 layers of layered injection of uniform solid sand, which improves the sand prevention pertinence of silty sand non-heterogeneous loose
    sandstone.

    The new technology first carried out 6 wells "cow knife small test" in Linpan oil production plant, including 2 wells in three layers and 4 wells in two layers, and the success rate of on-site stratification test was 100%.

    The half-year performance statistics show that the six wells have sustained stable production, the average liquid volume has increased from 6.
    6 cubic meters per day to 15.
    4 cubic meters per day, and the oil volume has increased from 1.
    2 tons per day to 3.
    3 tons per day, which verifies the technical advantages
    of layered chemical sand control technology in heterogeneous multi-layer wells.

    The new technology has been continuously enriched and enriched, and a sequence
    of layered chemical sand control technologies covering formation pretreatment optimization, diversified active sand fixing systems, and layered injection processes has gradually formed.

    Go one step further

    With the further promotion of technology, the project team has carried out more in-depth exploration and improvement in sand fixing system, layered injection pipe string and parameter optimization, especially the successful application in small casing wells, which has accumulated valuable experience
    for expanding the application field of layered chemical sand control technology.

    The small casing well in Shengli Oilfield has always been a major problem
    for sand control in various oil production plants.
    First of all, due to the small size of the casing, it is difficult to post-process; Secondly, due to the small gap between the inner and outer casings, the cementing quality cannot be guaranteed, and there are risks
    such as interlayer channeling and jamming.
    In order to solve this problem, the researchers realized the sand prevention of some small casing tube wells in the temporary pan and isolated island oil production plants by means of optimization of construction displacement in different layers and optimization of sand fixing materials
    .

    Up to now, the layered chemical sand prevention technology has begun to be popularized and applied on a large scale in Shengli Oilfield, with a maximum validity period of 758 days and continuous effectiveness, providing technical support
    for Shengli Oilfield to achieve cost reduction and efficiency increase, stable production and production increase.

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