Can dissovable bridge plugs replace conventional drillable bridge plugs?

At present, horizontal well fracturing technology has become an important tool for reservoir reforming and effectively increasing the production of a single well. As one of the important tools for fracturing, bridge plugs are increasingly widely used. Currently, conventional bridge plugs include drillable bridge plugs and large diameter bridge plugs. Drillable bridge plugs are prone to cause downhole accidents and high operation and construction costs during the milling process of drilling tools after fracturing, while debris and working fluids are prone to contaminate the reservoir.

The main body of the dissovable bridge plug is made of lightweight and high-strength dissovablealloy material with high strength, pressure resistance of 70 MPa, dissovablein water, and controllable dissolution time. After fracturing, the dissovable bridge plug reacts with the fluid in the wellbore under high temperature and high pressure, dissolves and is discharged from the wellbore with the drainage fluid. The invention of this tool is a complete reversal of the traditional bridge plug fracturing tool.

The cost of dissolvable bridge plugs is basically the same as that of imported composite bridge plugs, but the follow-up process of traditional bridge plugs is long and expensive, while the use of dissolvable bridge plugs can significantly reduce the post-construction costs of fracturing operations. Dissolvable bridge plugs can minimise the possibility of seating in the middle of a fracturing operation, and even if the bridge plug is jammed, it can be dissolved through rapid treatment technology, thus reducing the risk of overhauling the bridge plug.

Diossovable Bridge plug

dissovablebridge plugs are available in the following temperature classes: <50°C, 50-80°C, 80-120°C, and 120-160°C. There are 4 temperature levels in total. According to the seating depth, the stratum temperature of the depth can be calculated, and the corresponding dissovablebridge plug can be selected.

The dissovablebridge plug is made of dissovablemagnesium alloy. It can meet the strength requirement under high temperature and high pressure, and the product is almost non-decomposable in Qingshuihe guagel solution. By adjusting the formula, it can be controlled to dissolve under different temperatures and mineralisation levels, and the dissolution speed is proportional to the mineralisation level and temperature downhole, and the dissolved product is in the form of suspended powder, which is easy to be returned to the drainage.

Pre-dissolution material

Powder after dissolution

The product through the test well test, 75Mpa conditions 24 hours under pressure without dropping pressure, sealing performance is excellent, fast dissolution, dissolved into a non-sticky paste flowable liquid, fully meet the requirements of the dissolvable bridge plug, can replace similar imported products.

Dissovable metal

Dissovable material